10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2015

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 0-25756

IBERIABANK Corporation

(Exact name of Registrant as specified in its charter)

Louisiana	72-1280718
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
200 West Congress Street, Lafayette, Louisiana	70501
(Address of principal executive office)	(Zip Code)

Registrant’s telephone number, including area code: (337) 521-4003

Securities registered pursuant to Section 12(g) of the Act: Not Applicable

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of Exchange on which registered
Common Stock (par value $1.00 per share)	The NASDAQ Stock Market, LLC
Depositary Shares each representing 1/400th interest in a share of Series B Non-Cumulative Perpetual Preferred Stock	The NASDAQ Stock Market, LLC

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Exchange Act of 1934.    Yes  x    No  ¨

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.    Yes  ¨    No  x

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company (as defined in Securities Exchange Act Rule 12b-2).

Large Accelerated Filer x Accelerated Filer ¨ Non-accelerated Filer ¨ Smaller Reporting Company ¨

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Act)   Yes  ¨    No  x

As of June 30, 2015, the last business day of the Registrant’s most recently completed second fiscal quarter, the aggregate market value of the voting shares of common stock held by non-affiliates of the Registrant was approximately $2.7 billion. This figure is based on the closing sale price of $68.23 per share of the Registrant’s common stock on June 30, 2015. For purposes of this calculation, the term “affiliate” refers to all executive officers and directors of the Registrant and all shareholders beneficially owning more than 10% of the Registrant’s common stock.

Number of shares of common stock outstanding as of February 19, 2016: 41,260,334

DOCUMENTS INCORPORATED BY REFERENCE

(1) Portions of the Annual Report to Shareholders for the fiscal year ended December 31, 2015 are incorporated into Part II, Items 5 through 9B of this Form 10-K; (2) portions of the definitive proxy statement for the 2016 Annual Meeting of

Shareholders to be filed within 120 days of Registrant’s fiscal year end (the “Proxy Statement”) are incorporated into Part III, Items 10 through 14 of this Form 10-K.

IBERIABANK CORPORATION AND SUBSIDIARIES

TABLE OF CONTENTS

	PART I
Item 1.	Business	1
Item 1A.	Risk Factors	13
Item 1B.	Unresolved Staff Comments	27
Item 2.	Properties	27
Item 3.	Legal Proceedings	28
Item 4.	Mine Safety Disclosures	28
	PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	30
Item 6.	Selected Financial Data	31
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	31
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	31
Item 8.	Financial Statements and Supplementary Data	31
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	32
Item 9A.	Controls and Procedures	32
Item 9B.	Other Information	32
	PART III
Item 10.	Directors, Executive Officers and Corporate Governance	33
Item 11.	Executive Compensation	33
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	33
Item 13.	Certain Relationships and Related Transactions, and Director Independence	33
Item 14.	Principal Accounting Fees and Services	33
	PART IV
Item 15.	Exhibits and Financial Statement Schedules	34
SIGNATURES		37

PART I.

Item 1. Business.

Unless we indicate otherwise, the words “we”, “our”, “us”, “IBKC”, and “Company” refer to IBERIABANK Corporation and its wholly owned subsidiaries.

General

IBERIABANK Corporation, a Louisiana corporation, is a financial holding company with 320 combined locations, including 218 bank branch offices and three loan production offices in Louisiana, Arkansas, Tennessee, Alabama, Texas, Florida, and Georgia, 22 title insurance offices in Arkansas and Louisiana, and mortgage representatives in 68 locations in 10 states. The Company also has eight wealth management locations in five states and one IBERIA Capital Partners L.L.C. office in Louisiana. As of December 31, 2015, we had total consolidated assets of $19.5 billion, total deposits of $16.2 billion and shareholders’ equity of $2.5 billion.

Our principal executive office is located at 200 West Congress Street, Lafayette, Louisiana, and our telephone number at that office is (337) 521-4003. Our website is located at www.iberiabank.com.

We are the holding company for IBERIABANK, a Louisiana banking corporation headquartered in Lafayette, Louisiana; Lenders Title Company, an Arkansas-chartered title insurance and closing services agency headquartered in Little Rock, Arkansas (“Lenders Title”); IBERIA Capital Partners LLC, a corporate finance services firm (“ICP”); 1887 Leasing, LLC, a holding company for our aircraft, IBERIA Asset Management, Inc. (“IAM”), which provides wealth management and trust services to high net worth individuals, pension funds, corporations and trusts; 840 Denning, LLC, which invests in a commercial rental property; and IBERIA CDE, LLC (“CDE”), which invests in purchased tax credits.

IBERIABANK offers commercial and retail banking products and services to customers throughout locations in seven states. IBERIABANK provides these products and services in Louisiana, Alabama, Florida, Arkansas, Tennessee, Georgia and Texas. These products and services include a broad array of commercial, consumer, mortgage, and private banking products and services, trust services, cash management, deposit and annuity products. Certain of our non-bank subsidiaries engage in financial services-related activities, including brokerage services, sales of variable annuities, and wealth management services. Lenders Title offers a full line of title insurance and closing services throughout Arkansas and Louisiana. ICP provides equity research, institutional sales and trading, and corporate finance services throughout the energy industry. 1887 Leasing, LLC, owns an aircraft used by management of the Company and its subsidiaries. IAM provides wealth management advisory services for commercial and private banking clients. CDE is engaged in the purchase of tax credits.

Subsidiaries

IBERIABANK has seven active, wholly-owned non-bank subsidiaries. Information related to the non-bank subsidiaries as of December 31, 2015 is presented in the following table (dollars in millions):

Company	Description	Total Assets	Iberiabank’s Equity Investment
IBERIA Financial Services, LLC	Manages the brokerage services offered by IBERIABANK	$3.2	$1.1
IB SPE Management, Inc.	Operates then sells certain foreclosed assets acquired in recent Florida and Alabama acquisitions	40.9	40.8
Acadiana Holdings, LLC	Owns and operates a commercial office building that also serves as IBERIABANK’s headquarters	11.6	10.2
IBERIABANK Mortgage Company	Offers one-to-four family residential mortgage loans	256.9	80.7
Iberia Investment Fund I, LLC	Investment fund held for the purpose of funding new market tax credits	136.0	74.2
Iberia Investment Fund II, LLC	Investment fund held for the purpose of funding new market tax credits	7.6	2.8
Mercantile Capital Corporation	Offers owner-occupied commercial real estate loans	70.4	6.4

Lenders Title provides a full line of title insurance and loan closing services for both residential and commercial customers in locations throughout Arkansas. Lenders Title has three wholly-owned subsidiaries: Asset Exchange, Inc., United Title of Louisiana, Inc. (“United Title”), and American Abstract and Title Company, Inc. (“AAT”). Asset Exchange, Inc. provides qualified intermediary services to facilitate Internal Revenue Code Section 1031 tax deferred exchanges. At

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December 31, 2015, Lenders Title’s equity investment in Asset Exchange, Inc. was $0.3 million, and Asset Exchange, Inc. had total assets of $0.3 million. LTC, United Title and AAT provide a full line of title insurance and loan closing services for both residential and commercial customers in locations throughout Louisiana and Arkansas. At December 31, 2015, Lenders Title’s equity investment in United Title was $7.4 million, and United Title had total assets of $11.1 million. Lenders Title’s equity investment in AAT was $4.5 million and AAT had total assets of $5.9 million.

ICP, 1887 Leasing, LLC, IAM, 840 Denning, LLC and CDE had total assets of $7.6 million, $9.1 million, $0.9 million, $3.5 million and less than $0.1 million, respectively, at December 31, 2015.

Competition

We face strong competition in attracting deposits, originating loans, and providing title services. Our most direct competition for deposits has historically come from other commercial banks, savings institutions, and credit unions located in our market areas, including many large financial institutions that have greater financial and marketing resources available to them. In addition, during times of high interest rates, we have faced significant competition for investors’ funds from short-term money market securities, mutual funds and other corporate and government securities. Our ability to attract and retain customer deposits depends on our ability to generally provide a rate of return, liquidity and risk comparable to that offered by competing investment opportunities.

We experience strong competition for loan originations principally from other commercial banks, savings institutions, and mortgage banking companies. We compete for loans principally through the interest rates and loan fees we charge, the efficiency and quality of services we provide borrowers and the convenient locations of our branch office network.

Employees

We had 3,084 full-time associates and 132 part-time associates as of December 31, 2015. None of these associates is represented by a collective bargaining agreement. We believe we enjoy an excellent relationship with our associates.

Business Combinations

We continually evaluate business combination opportunities and sometimes conduct due diligence activities in connection with them. As a result, business combination discussions and, in some cases, negotiations, take place, and transactions involving cash, debt or equity securities could be expected. Any future business combinations or series of business combinations that we might undertake may be material in terms of assets acquired, liabilities assumed, or equity issued.

Available Information

Our filings with the Securities and Exchange Commission (“SEC”), including annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and all amendments thereto, are available on our website as soon as reasonably practicable after the reports are filed with or furnished to the SEC. Copies can be obtained free of charge in the “Investor Relations” section of our website at www.iberiabank.com. Our SEC filings are also available through the SEC’s website at www.sec.gov. Copies of these filings are also available by writing the Company at the following address:

IBERIABANK Corporation

P.O. Box 52747

Lafayette, Louisiana 70505-2747

Supervision and Regulation

The banking industry is extensively regulated under both federal and applicable state laws. The following discussion is a summary of certain statutes and regulations applicable to bank and financial holding companies and their subsidiaries and provides specific information relevant to us. Regulation of financial institutions is intended primarily for the protection of depositors, deposit insurance funds and the banking system, and generally is not intended for the protection of shareholders. Proposals are frequently introduced to change federal and state laws and regulations applicable to us. The likelihood and timing of any such changes and the impact such changes might have on us are impossible to determine with any certainty. References to applicable statutes and regulations are brief summaries, do not purport to be complete, and are qualified in their entirety by reference to such statutes and regulations.

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General

We are a bank holding company and have elected to be a financial holding company with the Board of Governors of the Federal Reserve System (the “FRB”). We are subject to examination and supervision by the FRB pursuant to the Bank Holding Company Act of 1956, as amended (the “BHCA”), and are required to file reports and other information regarding our business operations and the business operations of our subsidiaries with the FRB.

Generally, the BHCA provides for “umbrella” regulation of financial holding companies by the FRB and functional regulation of holding company subsidiaries by applicable regulatory agencies. The BHCA, however, requires the FRB to examine any subsidiary of a bank holding company, other than a depository institution, engaged in activities permissible for a depository institution. The FRB is also granted the authority, in certain circumstances, to require reports of, and to examine and adopt rules applicable to, any holding company subsidiary.

In general, the BHCA and the FRB’s regulations limit the nonbanking activities permissible for bank holding companies to those activities that the FRB has determined to be so closely related to banking or managing or controlling banks to be a proper incident thereto. A bank holding company such as us that has elected to be a financial holding company, however, may engage in, and acquire companies engaged in, activities that are considered “financial in nature,” as defined by the Gramm-Leach-Bliley Act of 1999 and FRB regulations. These activities include, among other things, securities underwriting, dealing and market-making, sponsoring mutual funds and investment companies, insurance underwriting and agency activities, and merchant banking. Refer to “Holding Company Regulation - Financial Holding Company Status” below.

Because we are a public company, we are also subject to regulation by the Securities and Exchange Commission (the “SEC”). The SEC has established three categories of registrants for the purpose of filing periodic and annual reports. Under these regulations, we are considered to be a “large accelerated filer” and, as such, must comply with SEC large accelerated reporting requirements.

As a Louisiana-chartered commercial bank and a member of the Federal Reserve System, IBERIABANK is subject to regulation, supervision and examination by the Office of Financial Institutions of the State of Louisiana (the “OFI”), IBERIABANK’s chartering authority, and the FRB, IBERIABANK’s primary federal regulator. IBERIABANK is also subject to examination by the Federal Deposit Insurance Corporation (the “FDIC”). The FDIC insures the deposits of IBERIABANK to the maximum extent permitted by law.

State and federal laws govern the activities in which IBERIABANK may engage, the investments it may make and the aggregate amount of loans that may be granted to one borrower. Various consumer and compliance laws and regulations also affect IBERIABANK’s operations.

The banking industry is affected by the monetary and fiscal policies of the FRB. An important function of the FRB is to regulate the national supply of bank credit to moderate recessions and to curb inflation. Among the instruments of monetary policy used by the FRB to implement its objectives are: open-market operations in U.S. government securities, changes in the discount rate and the federal funds rate (which is the rate banks charge each other for overnight borrowings) and changes in reserve requirements on bank deposits.

In addition to federal and state banking laws and regulations, we and certain of our subsidiaries and affiliates, including those that engage in securities brokerage and insurance activities, are subject to other federal and state laws and regulations, and supervision and examination by other state and federal regulatory agencies, including the Financial Industry Regulatory Authority (“FINRA”), the U.S. Department of Housing and Urban Development, the SEC, the Consumer Financial Protection Bureau ("CFPB") and various state insurance and securities regulators.

The Dodd-Frank Act

The Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”), enacted in 2010, significantly restructured financial regulation in the United States, including through the creation of a new resolution authority, mandating higher capital and liquidity requirements and directing changes in the way banks are assessed for federal deposit insurance, as well as through numerous other provisions intended to strengthen the financial services sector.

The Dodd-Frank Act established the Consumer Financial Protection Bureau (the “CFPB”) which has extensive regulatory and enforcement powers over consumer financial products and services, and the Financial Stability Oversight Council, which has oversight authority for monitoring and regulating systemic risk. In addition, the Dodd-Frank Act altered the authority and duties of the federal banking and securities regulatory agencies, implemented certain corporate governance

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requirements for all public companies, including financial institutions, with regard to executive compensation, proxy access by shareholders, and certain whistleblower provisions, and restricted certain proprietary trading and hedge fund and private equity activities of banks and their affiliates.

The Dodd-Frank Act gave the CFPB authority for interpreting and enforcing a broad range of federal consumer financial protection laws that govern the provision of deposit accounts and the making of loans, including the regulation of mortgage lending and servicing. These include laws such as the Equal Credit Opportunity Act, the Truth in Lending Act, the Truth in Savings Act, the Home Mortgage Disclosure Act, the Real Estate Settlement Procedures Act, and the Fair Credit Reporting Act.

• The CFPB issued final regulations governing mainly consumer mortgage lending. Additional requirements are imposed on lenders, including requirements designed to require lenders to ensure borrowers’ ability to repay their mortgage.

• The CFPB finalized a rule on escrow accounts for higher priced mortgage loans and a rule expanding the scope of the high-cost mortgage provision in the Truth in Lending Act.

• The CFPB issued final rules implementing provisions of the Dodd-Frank Act that relate to mortgage servicing.

• The CFPB issued a final appraisal rule under the Equal Credit Opportunity Act, and federal agencies issued an interagency rule on appraisals for higher-priced mortgage loans.

• The CFPB issued a final rule on integrated mortgage disclosures under the Truth in Lending Act and the Real Estate Settlement Procedures Act, compliance with which was required and implemented by the Company as of October 3, 2015.

• In 2013, the CFPB provided guidance on fair lending practices to indirect automobile lenders with recommendations to ensure compliance with fair lending laws.

• In October 2015, the CFPB adopted a final rule amending its Home Mortgage Disclosure Act regulations. The final rule, which will become generally effective on January 1, 2018, among other things (i) expands the regulation’s coverage to apply data collection and reporting requirements to all consumer loans and lines of credit secured by a dwelling and (ii) adds numerous new data collection requirements.

The CFPB was granted the authority to take enforcement actions against banks and other financial services companies that fail to satisfy the standards imposed by it. As a bank with total assets of more than $10 billion, IBERIABANK is subject to CFPB supervision and examination of its compliance with the federal consumer financial protection laws.

Recently, banking regulatory agencies have increasingly used a general consumer protection statute to address unethical or otherwise bad business practices that may not necessarily fall directly under the purview of a specific banking or consumer finance law. Prior to the Dodd-Frank Act, there was little formal guidance to provide insight to the parameters for compliance with the “unfair or deceptive acts or practices” (“UDAP”) law. However, the UDAP provisions were expanded under the Dodd-Frank Act to apply to “unfair, deceptive or abusive acts or practices”, supervision over which has been delegated to the CFPB.

New laws or regulations or changes to existing laws and regulations (including changes in interpretations or enforcement) could materially adversely affect our financial condition or results of operations. Many of the provisions of the Dodd-Frank Act have delayed effective dates, and the legislation required various federal agencies to promulgate numerous and extensive implementing regulations, some of which have not yet been issued in final form. Although the overall financial impact on us and our subsidiaries or the financial services industry generally cannot be anticipated at this time, the Dodd-Frank Act and the implementing regulations have increased and may continue to increase our operating and compliance costs.

The Volcker Rule. In December 2013, the FRB and other federal agencies issued final rules to implement the so-called “Volcker Rule” contained in the Dodd-Frank Act, which generally became effective on July 21, 2015. The Volcker Rule prohibits an insured depository institution and its affiliates (referred to as “banking entities”) from: (i) engaging in “proprietary trading” and (ii) investing in or sponsoring certain types of funds (“covered funds”) subject to certain limited exceptions. These prohibitions impact the ability of U.S. banking entities to provide investment management products and services that are competitive with nonbanking firms generally and with non-U.S. banking organizations in overseas markets. The rule also

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effectively prohibits short-term trading strategies by any U.S. banking entity if those strategies involve instruments other than those specifically permitted for trading.

The final Volcker Rule regulation provides certain exemptions allowing banking entities to continue underwriting, market-making and hedging activities and trading certain government obligations, as well as various exemptions and exclusions from the definition of “covered funds.” The final rule imposes certain reporting and compliance requirements on banking entities that engage in exempted trading activities. The level of required compliance depends on the size of the banking entity and the extent of its trading, with most requirements applicable only to banking entities with $50 billion or more in total consolidated assets, or those with $50 billion or more in worldwide trading assets and liabilities. As a banking entity with more than $10 billion in total assets but less than $10 billion in total trading assets and liabilities, we were required by the final Volcker Rule to implement a compliance program appropriate for the types, size, scope, and complexity of our permitted trading activities. We do not expect the Volcker Rule’s compliance requirements to have a material effect on our operations.

The Durbin Amendment. The “Durbin Amendment” provisions of the Dodd-Frank Act require the FRB to establish a cap on the rate merchants pay banks for electronic clearing of debit transactions (i.e. the interchange rate). The FRB issued a final rule for establishing standards, including a cap, for debit card interchange fees and prohibiting network exclusivity arrangements and routing restrictions. The final rule established standards for assessing whether debit card interchange fees received by debit card issuers were reasonable and proportional to the costs incurred by issuers for electronic debit transactions. Under the final rule, the maximum permissible interchange fee that an issuer may receive for an electronic debit transaction is the sum of 21 cents per transaction, a 1 cent fraud prevention adjustment, and 5 basis points multiplied by the value of the transaction. As a result of implementing this lower debit card interchange fee structure, our electronic banking income was negatively impacted.

Basel III Capital Rules

In 2013, the FRB and the other federal banking agencies issued final rules (the “Basel III Capital Rules”) establishing a new comprehensive capital framework for U.S. banking organizations. The Basel III Capital Rules substantially revised the risk-based capital requirements applicable to bank holding companies and depository institutions, including the Company and IBERIABANK. The Basel III Capital Rules redefined the components of regulatory capital and addressed other issues affecting the numerator in calculating banking institutions' regulatory capital ratios. The Basel III Capital Rules also revised risk weights and other issues affecting the denominator in calculating banking institutions’ regulatory capital ratios with a more risk-sensitive approach. The Company and IBERIABANK became subject to the Basel III Capital Rules on January 1, 2015, subject to phase-in periods as discussed below.

The Basel III Capital Rules increase the minimum requirements for both the quality and quantity of capital held by banking organizations. In this respect, the Basel III Capital Rules implement strict eligibility criteria for regulatory capital instruments and improve the methodology for calculating risk-weighted assets to enhance risk sensitivity. Among other things, the Basel III Capital Rules (i) introduce a new capital measure called “Common Equity Tier 1” (CET1), (ii) specify that Tier 1 capital consists of CET1 and “Additional Tier 1 capital” instruments meeting specified requirements, (iii) define CET1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to CET1 and not to the other components of capital and (iv) expand the scope of the deductions/adjustments from capital as compared to previously effective regulations. CET1 is defined as the sum of common stock and related surplus net of treasury stock, retained earnings, accumulated other comprehensive income (AOCI) (which includes all unrealized gains and losses on available for sale debt and equity securities) and qualifying minority interest, less applicable regulatory adjustments and deductions that include AOCI.

Banking organizations were provided a one-time option in the first quarter of 2015 to permanently opt out of the inclusion of most AOCI in their calculation of CET1. The Company and IBERIABANK elected to opt out in order to reduce the impact of market volatility on their regulatory capital levels.

Under the Basel III Capital Rules, the minimum capital ratios effective as of January 1, 2015 are as follows:

•4.5% CET1 to risk-weighted assets.

•6.0% Tier 1 capital to risk-weighted assets.

•8.0% Total capital to risk-weighted assets.

▪4.0% Tier 1 capital to average consolidated assets as reported on consolidated financial statements (known as the "leverage ratio").

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The Basel III Capital Rules also introduce a new “capital conservation buffer”, composed entirely of CET1, on top of these minimum risk-weighted asset ratios. The capital conservation buffer is designed to absorb losses during periods of economic stress. Banking institutions with a ratio of CET1 to risk-weighted assets above the minimum requirement but below the capital conservation buffer will face constraints on dividends, equity repurchases and compensation based on the amount of the shortfall. When fully phased in on January 1, 2019, the Basel III Capital Rules will require the Company and IBERIABANK to maintain (i) a minimum ratio of CET1 to risk-weighted assets of at least 4.5%, plus the 2.5% capital conservation buffer, effectively resulting in a minimum ratio of CET1 to risk-weighted assets of at least 7%, (ii) a minimum ratio of Tier 1 capital to risk-weighted assets of at least 6.0%, plus the capital conservation buffer, effectively resulting in a minimum Tier 1 capital ratio of 8.5%, (iii) a minimum ratio of Total capital (Tier 1 plus Tier 2) to risk-weighted assets of at least 8.0%, plus the capital conservation buffer, effectively resulting in a minimum total capital ratio of 10.5% and (iv) a minimum leverage ratio of 4%, calculated as the ratio of Tier 1 capital to average assets (as compared to a current minimum leverage ratio of 3% for certain highly rated banking organizations). Implementation of the capital conservation buffer began on January 1, 2016 at the 0.625% level and will be phased in over a three-year period until reaching 2.5% on January 1, 2019.

The Basel III Capital Rules provide for a number of deductions from and adjustments to CET1. These include, for example, the requirement that mortgage servicing rights, certain deferred tax assets and significant investments in non-consolidated financial entities be deducted from CET1 to the extent that any one such category exceeds 10% of CET1 or all such categories in the aggregate exceed 15% of CET1. Implementation of the deductions from and adjustments to CET1 began on January 1, 2015 and will be phased-in over a three-year period ending January 1, 2018.

The Basel III Capital Rules also preclude counting certain hybrid securities, such as trust preferred securities, as Tier 1 capital of bank holding companies. Tier 1 capital treatment for the Company’s trust preferred securities was subject to phase-out during 2015, with 75% phased out effective January 1, 2015 and the remainder phased out effective January 1, 2016.

The Basel III Capital Rules prescribe a standardized approach for risk weightings that substantially revises the risk weights assigned by the previously effective capital regulations. Material changes include a 150% risk weight (up from 100%) for certain high volatility commercial real estate acquisition, development and construction loans and for non-residential mortgage loans that are 90 days past due or otherwise on nonaccrual status; a 20% (up from 0%) credit conversion factor for the unused portion of a commitment with an original maturity of one year or less that is not unconditionally cancellable; a 250% risk weight (up from 100%) for mortgage servicing and deferred tax assets that are not deducted from capital; and increased risk-weights (from 0% to up to 600%) for equity exposures.

Failure to meet applicable capital standards could subject the bank holding company or financial institution to a variety of enforcement remedies available to the federal regulatory authorities. These include limitations on the ability to pay dividends, the issuance by the regulatory authorities of a capital directive to increase capital, and the termination of deposit insurance by the FDIC. In addition, the financial institution could be subject to the measures described below under “- Federal Bank Regulation - Prompt Corrective Action” as applicable to “under-capitalized” institutions.

The FRB’s capital standards specify that evaluations by the FRB of a bank’s capital adequacy will include an assessment of the exposure to declines in the economic value of the bank’s capital due to changes in interest rates. The federal banking agencies have issued a joint policy statement on interest rate risk describing prudent methods for monitoring such risk that rely principally on internal measures of exposure and active oversight of risk management activities by senior management.

Additional information, including our and IBERIABANK’s compliance with applicable capital adequacy standards at December 31, 2015, is provided in Note 16 to the Consolidated Financial Statements and in “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Capital Resources” in Exhibit 13 to this Form 10-K, which are incorporated herein by reference.

Federal Banking Regulation

FDIC Insurance. IBERIABANK pays deposit insurance premiums to the FDIC based on assessment rates established by the FDIC. These rates generally depend upon a combination of regulatory ratings and financial ratios. Regulatory ratings reflect the applicable bank regulatory agency’s evaluation of the financial institution’s capital, asset quality, management, earnings, liquidity and sensitivity to risk, or “CAMELS”. Assessment rates (inclusive of possible adjustments) currently range from 2.5 to 45 basis points of an institution’s total assets less tangible capital. The FDIC may increase or decrease the range of assessments uniformly, except that no adjustment can deviate more than two basis points from the base assessment rate without notice and comment rulemaking. The FDIC’s current system represents a change, required by the Dodd-Frank Act, from its prior practice of basing the assessment on an institution’s aggregate deposits.

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In 2011, the FDIC adopted a final rule to revise the deposit insurance assessment system for large institutions: one for most large institutions that have more than $10 billion in assets, and another for “highly complex” institutions that have over $50 billion in assets and are fully owned by a parent with over $500 billion in assets. Each scorecard has a performance score and a loss-severity score that are combined to produce a total score, which is translated into an initial assessment rate. In calculating these scores, the FDIC utilizes the bank’s supervisory CAMELS ratings and uses certain new forward-looking financial measures to assess an institution’s ability to withstand asset-related stress and funding-related stress. The rule also eliminated the use of risk categories and long-term debt issuer ratings for calculating risk-based assessments for institutions having more than $10 billion in assets. The FDIC is authorized to make discretionary adjustments to the total score based upon significant risk factors that are not adequately captured in the scorecard. The total score will then be translated to an initial base assessment rate.

Under the Federal Deposit Insurance Act, as amended by the Dodd-Frank Act, a minimum ratio of the Deposit Insurance Fund’s deposit insurance reserves to estimated insured deposits, or designated reserve ratio (the “DRR”), of 1.15% is applicable prior to September 2020, with a DRR of 1.35% required thereafter. Under the Dodd-Frank Act, insured institutions with assets of $10 billion or more are required to fund the increase in the DRR to 1.35%.

Under the FDIC’s 2011 final rule, the insurance assessment schedule for all banks will be lowered starting the quarter after the DRR reaches 1.15%, which the FDIC currently projects will be the first or second quarter of 2016. In October 2015, the FDIC issued a proposed rule that would require insured institutions with an assessment base (total assets less tangible capital) of over $10 billion to pay surcharge assessments at an annual rate of 4.5 basis points, starting the quarter after the DRR reaches 1.15% and ending when the DRR reaches 1.35% (forecast to occur by the end of 2018). The 4.5 basis point surcharge would be assessed against the assessment base of covered institutions, such as IBERIABANK, reduced by $10 billion.

Insurance of deposits may be terminated by the FDIC upon a finding that the institution has engaged in unsafe and unsound practices, is in an unsafe or unsound condition to continue operations, or has violated any applicable law, regulation, rule, order or condition imposed by the FDIC.

In addition, the Deposit Insurance Funds Act of 1996 authorized the Financing Corporation (“FICO”) to impose assessments on applicable deposits in order to service the interest on FICO’s bond obligations from deposit insurance fund assessments. The amount assessed on individual institutions by FICO is in addition to the amount paid for deposit insurance under the FDIC’s risk-related assessment rate schedules. The bonds issued by FICO are due to mature in 2017 through 2019. IBERIABANK recognized approximately $1 millionof expense related to its FICO assessments in 2015.

We cannot predict whether the FDIC will in the future further increase deposit insurance assessment levels.

Liquidity Requirements. Historically, regulation and monitoring of bank and bank holding company liquidity has been addressed as a supervisory matter without required formulaic measures. The Basel III framework requires banks and bank holding companies to measure their liquidity against specific liquidity tests that, although similar in some respects to liquidity measures historically applied by banks and regulators for management and supervisory purposes, going forward such measures will be required by regulation. One test, the liquidity coverage ratio, is designed to ensure that the banking entity maintains an adequate level of unencumbered high-quality liquid assets equal to the entity’s expected net cash outflow for a 30-day time horizon. The other test, the net stable funding ratio, is designed to promote more medium- and long-term funding of the assets and activities of banking entities over a one-year time horizon. These requirements are intended to incent banking entities to increase their holdings of U.S. Treasury securities and other sovereign debt as a component of assets and increase the use of long-term debt as a funding source.

Prompt Corrective Action. The Federal Deposit Insurance Corporation Improvement Act of 1991, known as FDICIA, requires federal banking regulatory authorities to take “prompt corrective action” with respect to depository institutions that do not meet minimum capital requirements. For these purposes, FDICIA establishes five capital tiers: “well-capitalized,” “adequately-capitalized,” “under-capitalized,” “significantly under-capitalized,” and “critically under-capitalized.” Under the FRB’s regulations implementing FDICIA’s prompt corrective action provisions, which were amended to incorporate the regulatory capital standards implemented by the Basel III Capital Rules, an institution is deemed to be:

• “well-capitalized” if it has a total risk-based capital ratio of 10% or greater, a Tier 1 risk-based capital ratio of 8% or greater, a Tier 1 leverage ratio of 5% or greater, and a common equity Tier 1 ratio of 6.5% or greater and is not subject to a regulatory order, agreement, or directive to meet and maintain a specific capital level for any capital measure;

• “adequately capitalized” if it has a total risk-based capital ratio of 8% or greater, a Tier 1 risk-based capital

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ratio of 6% or greater, a Tier 1 leverage ratio of 4% or greater, and a common equity Tier 1 ratio of 4.5% or greater and the institution does not meet the definition of a “well-capitalized” institution;

• “under-capitalized” if it does not meet one or more of the “adequately-capitalized” tests;

• “significantly under-capitalized” if it has a total risk-based capital ratio that is less than 6%, a Tier 1 risk-based capital ratio that is less than 4%, a Tier 1 leverage ratio that is less than 3%, or a common equity Tier 1 ratio of less than 3%; and

• “critically under-capitalized” if it has a ratio of tangible equity, as defined in the regulations, to total assets that is equal to or less than 2%.

Throughout 2015, our regulatory capital ratios were in excess of the levels established for “well-capitalized” institutions.

FDICIA generally prohibits a depository institution from making any capital distribution, including payment of a cash dividend or paying any management fee to its holding company, if the depository institution would be “under-capitalized” after such payment. “Under-capitalized” institutions are subject to growth limitations and are required by the appropriate federal banking agency to submit a capital restoration plan. If any depository institution subsidiary of a holding company is required to submit a capital restoration plan, the holding company would be required to provide a limited guarantee regarding compliance with the plan as a condition of approval of such plan.

If an “under-capitalized” institution fails to submit an acceptable plan, it is treated as if it is “significantly under-capitalized.” “Significantly under-capitalized” institutions may be subject to a number of requirements and restrictions, including orders to sell sufficient voting stock to become “adequately-capitalized,” requirements to reduce total assets, and cessation of receipt of deposits from correspondent banks.

“Critically under-capitalized” institutions may not, beginning 60 days after becoming “critically under-capitalized,” make any payment of principal or interest on their subordinated debt. In addition, “critically under-capitalized” institutions are subject to appointment of a receiver or conservator within 90 days of becoming so classified.

Under FDICIA, a depository institution that is not “well-capitalized” is generally prohibited from accepting brokered deposits and offering interest rates on deposits higher than the prevailing rate in its market. As previously stated, IBERIABANK is “well-capitalized” and the FDICIA brokered deposit rule did not adversely affect their ability to accept brokered deposits. IBERIABANK had $1.5 billion of such brokered deposits at December 31, 2015.

Federal Reserve Bank Membership. IBERIABANK is a member of the Federal Reserve Bank of Atlanta and is required to buy stock in the Federal Reserve Bank in an amount equal to 6% of IBERIABANK’s paid-up capital and surplus. Through December 31, 2015, IBERIABANK received statutory dividends of 6% per year on the stock it holds in the Federal Reserve Bank. Under the Fixing Americas Surface Transportation Act, enacted on December 4, 2015, the dividend rate to Federal Reserve member banks with assets of more than $10 billion, such as IBERIABANK, was reduced to the lesser of (i) the high yield on the 10-year United States Treasury note at the last auction prior to the dividend payment or (ii) 6%. Based on current and projected Treasury note yields, we expect that this statute will reduce the Federal Reserve Bank dividends payable to IBERIABANK by an annual amount of approximately $2 million.

Affiliate Transactions. IBERIABANK is subject to Regulation W, which comprehensively implements statutory restrictions on transactions between a bank and its affiliates and incorporates the FRB’s interpretations and exemptions relating to Sections 23A and 23B of the Federal Reserve Act.

Section 23A and the implementing provisions of Regulation W generally place limits on the amount of a bank’s loans or extensions of credit to, investments in, or certain other transactions with affiliates, and on the amount of advances to third parties collateralized by the securities or obligations of affiliates. In general, IBERIABANK’s “affiliates” are IBERIABANK Corporation and our non-bank subsidiaries.

Section 23B and the implementing provisions of Regulation W generally require a bank’s transactions with its affiliates to be on terms substantially the same, or at least as favorable to the bank, as those prevailing at the time for comparable transactions with non-affiliated companies.

IBERIABANK is also subject to certain restrictions on extensions of credit to executive officers, directors, certain

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principal shareholders and their related interests. Such extensions of credit must be made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with third parties and must not involve more than the normal risk of repayment or present other unfavorable features.

Bank Secrecy Act. The Bank Secrecy Act, as amended by the USA Patriot Act of 2001 and its related regulations, requires insured depository institutions, broker-dealers, and certain other financial institutions to have policies, procedures, and controls to detect, prevent, and report money laundering and terrorist financing. The statute and its regulations also provide for information sharing, subject to conditions, between federal law enforcement agencies and financial institutions, as well as among financial institutions, for counter-terrorism purposes. Federal banking regulators are required, when reviewing bank holding company acquisition and bank merger applications, to take into account the effectiveness of the anti-money laundering activities of the applicants. The bank regulatory agencies have increased the regulatory scrutiny of Bank Secrecy Act and anti-money laundering programs maintained by financial institutions. Significant penalties and fines, as well as other supervisory enforcement action, may be imposed on a financial institution for non-compliance with these requirements.

Consumer Privacy and Other Consumer Protection Laws. We, like all other financial institutions, are required to maintain the privacy of our customers’ non-public, personal information. Such privacy requirements, as established by the Gramm-Leach-Bliley Act of 1999, direct financial institutions to:

• provide notice to our customers regarding privacy policies and practices,

• inform our customers regarding the conditions under which their non-public personal information may be disclosed to non-affiliated third parties, and

• give our customers an option to prevent disclosure of such information to non-affiliated third parties.

Under the Fair and Accurate Credit Transactions Act of 2003, our customers may also opt out of information sharing between and among us and our affiliates.

In connection with our lending and leasing activities, IBERIABANK is subject to a number of federal and state laws designed to protect consumers and promote lending and other financial services to various sectors of the economy and population. These laws include, among others, the Home Mortgage Disclosure Act, the Real Estate Settlement Procedures Act, the Equal Credit Opportunity Act, the Truth in Lending Act, the Electronic Fund Transfer Act, the Truth in Savings Act, and the Fair Credit Reporting Act. The CFPB was assigned authority by the Dodd-Frank Act to write regulations implementing these and other laws. IBERIABANK’S consumer financial products and services are subject to the regulations of the CFPB and, as an institution with assets of more than $10 billion, IBERIABANK will be examined by the CFPB for compliance with these rules. See “The Dodd-Frank Act” above.

In addition, all insured depository institutions have a responsibility under the Community Reinvestment Act (the “CRA”) and related federal regulations to help meet the credit needs of their communities, including low- and moderate-income neighborhoods. In connection with its examination of a state-chartered Federal Reserve member bank like IBERIABANK, the FRB is required to assess our record of compliance with the CRA. Such assessment is reviewed by the FRB when the Company or IBERIABANK makes application for approval of an expansionary proposal, such as a merger or other acquisition of another bank or the opening of a new branch office. IBERIABANK received a “satisfactory” CRA rating in its most recent assessment by the FRB.

Incentive Compensation. Guidelines adopted by the federal banking agencies prohibit excessive compensation as an unsafe and unsound practice and describe compensation as excessive when the amounts paid are unreasonable or disproportionate to the services performed by an executive officer, employee, director or principal stockholder.

In 2010, the federal bank regulatory agencies issued guidance on incentive compensation policies (the “Incentive Compensation Guidance”) intended to ensure that the incentive compensation policies of banking organizations do not undermine the safety and soundness of such organizations by encouraging excessive risk-taking. The Incentive Compensation Guidance, which covers all employees that have the ability to materially affect the risk profile of an organization, either individually or as part of a group, is based upon the key principles that a banking organization’s incentive compensation arrangements should (i) provide incentives that do not encourage risk-taking beyond the organization’s ability to effectively identify and manage risks, (ii) be compatible with effective internal controls and risk management, and (iii) be supported by strong corporate governance, including active and effective oversight by the organization’s board of directors. Any deficiencies in compensation practices that are identified may be incorporated into the organization’s supervisory ratings, which can affect its ability to make acquisitions or perform other actions. The Incentive Compensation Guidance provides that enforcement

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actions may be taken against a banking organization if its incentive compensation arrangements or related risk-management control or governance processes pose a risk to the organization’s safety and soundness and the organization is not taking prompt and effective measures to correct the deficiencies.

The Dodd-Frank Act requires the federal bank regulatory agencies and the SEC to establish joint regulations or guidelines prohibiting incentive-based payment arrangements at specified regulated entities having at least $1 billion in total assets that encourage inappropriate risks by providing an executive officer, employee, director or principal shareholder with excessive compensation, fees, or benefits or that could lead to material financial loss to the entity. In February 2011, the federal banking agencies and the SEC issued for comment a proposed interagency rule that would require the reporting of incentive-based compensation arrangements by a covered financial institution, as well as prohibiting incentive-based compensation arrangements at a covered financial institution when such compensation is excessive, could expose the institution to inappropriate risks, or potentially lead to material financial loss.

The final interagency rules on incentive compensation required under the Dodd-Frank Act have not been published, and it is uncertain at this time whether the previously proposed rule will be issued in final form or whether the agencies will issue a substantially revised proposed rule. It cannot be determined at this time whether compliance with the requirements of such future rules will adversely affect our and our subsidiaries’ ability to hire, retain and motivate their key employees.

Holding Company Regulation

General. As a bank holding company, we are subject to FRB examination, regulation and periodic reporting under the BHCA. The FRB has broad enforcement powers over bank holding companies and their non-banking subsidiaries. The FRB has authority to prohibit activities that represent unsafe or unsound practices or constitute violations of law, rule, regulation, administrative order or written agreement with a federal regulator. These powers may be exercised through the issuance of cease and desist orders, civil money penalties or other formal or informal actions.

Source of Strength. As a matter of FRB policy, which was codified by the Dodd-Frank Act, a bank holding company is expected to act as a source of financial and managerial strength to each of its subsidiary banks and to commit resources to support each such subsidiary bank. Under this source of strength doctrine, the FRB may require a bank holding company to make capital injections into a troubled subsidiary bank. The FRB may charge the bank holding company with engaging in unsafe and unsound practices if it fails to commit resources to such a subsidiary bank or if it undertakes actions that the FRB believes might jeopardize its ability to commit resources to such subsidiary bank. A capital injection may be required at times when the holding company does not have the resources to provide it.

In addition, any loans by a holding company to a subsidiary bank are subordinate in right of payment to deposits and to certain other indebtedness of such subsidiary bank. In the event of a bank holding company’s bankruptcy, the bankruptcy trustee will assume any commitment by the holding company to a federal bank regulatory agency to maintain the capital of a subsidiary bank. Moreover, the bankruptcy law provides that claims based on any such commitment will be entitled to a priority of payment over the claims of the institution’s general unsecured creditors, including the holders of its note obligations.

Moreover, the claims of a receiver of an insured depository institution for administrative expenses and the claims of holders of deposit liabilities of such an institution are accorded priority over the claims of general unsecured creditors of such an institution, including the holders of the institution’s note obligations, in the event of liquidation or other resolution of the institution. Claims of a receiver for administrative expenses and claims of holders of deposit liabilities of IBERIABANK, including the FDIC as the insurer of such holders, would receive priority over the holders of notes and other senior debt of IBERIABANK in the event of liquidation or other resolution and over our interests as sole shareholder of IBERIABANK.

Louisiana law permits the Commissioner of the OFI to require a special assessment of shareholders of a Louisiana-chartered bank whose capital has become impaired to remedy an impairment in such bank’s capital stock. This statute also provides that the Commissioner may suspend a bank’s certificate of authority until the capital is restored. As the sole shareholder of IBERIABANK, we are subject to such statute.

Stress Testing Requirements. As a bank holding company with total consolidated assets in excess of $10 billion, we are required under the Dodd-Frank Act and FRB regulation to conduct an annual stress test that projects our performance in various economic scenarios provided by the FRB. The Dodd-Frank Act stress tests are forward-looking exercises conducted by the FRB and financial companies regulated by the FRB to help ensure institutions have sufficient capital to absorb losses and support operations during adverse economic conditions. We are required to make certain assumptions in modeling future performance and must support these assumptions through statistical analysis and observed market behavior where applicable. The outcome of the FRB’s analysis of our projected performance (to include capital, earnings, and balance sheet changes) will

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be used in supervision of us and will assist the FRB in assessing our risk profile and capital adequacy. The results of our stress test could hinder our ability to pay quarterly cash dividends to shareholders as has been our practice, and could also impact the FRB’s decisions regarding future acquisitions by us. The results of our annual stress test are available on our website at www.iberiabank.com.

In May 2012, the federal banking agencies issued joint supervisory guidance for stress testing practices applicable to banking organizations with more than $10 billion in total consolidated assets, such as us and IBERIABANK, which became effective on July 23, 2012. The guidance addresses stress testing in connection with overall risk management, including capital and liquidity planning. The guidance outlines general principles for stress testing and highlights the importance of stress testing as an ongoing risk management practice that supports a banking organization’s forward-looking assessment of its risks. It outlines broad principles for a satisfactory stress testing framework and describes the manner in which stress testing should be employed as an integral component of risk management.

Dividends. We are a legal entity separate and distinct from our subsidiaries. The majority of our revenue is from dividends paid to us by IBERIABANK. IBERIABANK is subject to federal and state laws and regulations that limit the amount of dividends it can pay. In addition, we and IBERIABANK are subject to various regulatory restrictions relating to the payment of dividends, including requirements to maintain capital at or above regulatory minimums, and to remain “well-capitalized” under the prompt corrective action rules. The FRB has indicated generally that it may be an unsafe or unsound practice for a bank holding company to pay dividends unless the bank holding company’s net income over the preceding year is sufficient to fund the dividends and the expected rate of earnings retention is consistent with the organization’s capital needs, asset quality and overall financial condition.

In addition to the limitations placed on the payment of dividends at the holding company level, there are various legal and regulatory limits on the extent to which IBERIABANK may pay dividends or otherwise supply funds to us. IBERIABANK is subject to laws and regulations of Louisiana, which place certain restrictions on the payment of dividends. Additionally, as a member of the Federal Reserve System, IBERIABANK is subject to regulations of the FRB.

We do not expect that these laws, regulations or policies will materially affect our ability to pay dividends. Additional information is provided in Note 16 to the Consolidated Financial Statements incorporated herein by reference.

Acquisitions. We comply with numerous laws relating to our acquisition activity. Under the BHCA, we are required to obtain the prior approval of the FRB to acquire ownership or control of more than 5% of the voting shares or substantially all of the assets of any bank holding company or bank or merge or consolidate with another bank holding company. Current Federal law authorizes interstate acquisitions of banks and bank holding companies without geographic limitation. Furthermore, a bank headquartered in one state is authorized to merge with a bank headquartered in another state, as long as neither of the states have opted out of such interstate merger authority prior to such date, and subject to any state requirement that the target bank shall have been in existence and operating for a minimum period of time, not to exceed five years; and subject to certain deposit market-share limitations. After a bank has established branches in a state through an interstate merger transaction, the bank may establish and acquire additional branches at any location in the state where a bank headquartered in that state could have established or acquired branches under applicable federal or state law.

On February 28, 2015, we completed the acquisition of Florida Bank Group, Inc., a Tampa, Florida-based banking holding company with $542 million in assets, and its commercial bank subsidiary, Florida Bank Group Bank. On March 31, 2015, we completed the acquisition of Old Florida Bancshares, Inc., a bank holding company located in Orlando, Florida with $1.5 billion in assets, and its commercial bank subsidiaries, Old Florida Bank and New Traditions Bank. On May 31, 2015, we completed the acquisition of Georgia Commerce Bancshares, Inc., an Atlanta, Georgia-based bank holding company with $1.0 billion in assets, and its commercial bank subsidiary, Georgia Commerce Bank.

Financial Holding Company Status. A bank holding company meeting certain requirements may qualify and elect to become a financial holding company, permitting the bank holding company to engage in additional activities that are financial in nature or incidental or complementary to financial activity. Financial holding companies are authorized by the BHCA to engage in a number of financial activities previously impermissible for bank holding companies, including equity securities underwriting, dealing and market making; sponsoring mutual funds and investment companies; insurance underwriting and agency; and merchant banking activities through securities or insurance affiliates; and insurance company portfolio investments. The Act also permits the FRB to authorize additional activities for financial holding companies if they are “financial in nature” or “incidental” to financial activities.

For a bank holding company to be eligible to elect financial holding company status, the holding company must be both “well-capitalized” and “well-managed” under applicable regulatory standards, and all of its subsidiary banks also must be

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“well-capitalized” and “well-managed” and must have received at least a satisfactory rating on such institution’s most recent examination under the CRA. A financial holding company that continues to meet all of such requirements may engage directly or indirectly in activities considered financial in nature (discussed above), either de novo or by acquisition, as long as it gives the FRB after-the-fact notice of the new activities. If a financial holding company fails to continue to meet any of the prerequisites for financial holding company status after engaging in activities not permissible for bank holding companies that have not elected to be treated as financial holding companies, the company must enter into an agreement with the FRB that it will comply with all applicable capital and management requirements. If the financial holding company does not return to compliance within 180 days, or such longer period as agreed to by the FRB, the FRB may order the company to discontinue existing activities that are not generally permissible for bank holding companies or divest investments in companies engaged in such activities. In addition, if any banking subsidiary of a financial holding company receives a CRA rating of less than satisfactory, the holding company would be prohibited from engaging in any additional activities other than those permissible for bank holding companies that are not financial holding companies.

Sarbanes-Oxley Act of 2002. The Sarbanes-Oxley Act of 2002, or the SOX Act, implements a broad range of corporate governance, accounting and disclosure requirements for public companies, and also for their directors and officers. SEC rules adopted to implement the SOX Act requirements require our chief executive and chief financial officer to certify certain financial and other information included in our quarterly and annual reports. The rules also require these officers to certify that they are responsible for establishing, maintaining and regularly evaluating the effectiveness of our financial reporting and disclosure controls and procedures; that they have made certain disclosures to the auditors and to the Audit Committee of the board of directors about our controls and procedures; and that they have included information in their quarterly and annual filings about their evaluation and whether there have been significant changes to the controls and procedures or other factors which would significantly impact these controls subsequent to their evaluation. Section 404 of the SOX Act requires management to undertake an assessment of the adequacy and effectiveness of our internal controls over financial reporting and requires our auditors to attest to and report on the effectiveness of these controls. See Item 9A. - “Controls and Procedures” hereof for our evaluation of disclosure controls and procedures. The certifications required by Sections 302 and 906 of the SOX Act also accompany this Report on Form 10-K.

Other Regulatory Matters. We and our subsidiaries and affiliates are subject to numerous examinations by federal and state banking regulators, as well as the SEC, FINRA, NASDAQ Stock Market, and various state insurance and securities regulators.

Corporate Governance

Information with respect to our corporate governance is available on our web site, www.iberiabank.com, and includes:

• Corporate Governance Guidelines

• Nominating and Corporate Governance Committee Charter

• Compensation Committee Charter

• Audit Committee Charter

• Board Risk Committee Charter

• Codes of Ethics for directors, officers, and other employees

• Code of Ethics for the Chief Executive Officer and Senior Financial Officers

• Chief Executive Officer and Chief Financial Officer Certifications

We intend to disclose any waiver of or substantial amendment to the Codes of Ethics applicable to directors and executive officers on our web site at www.iberiabank.com.

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Item 1A. Risk Factors.

There are risks, many beyond our control, which could cause our results to differ significantly from management’s expectations. Some of these risk factors are described below. Any factor described in this report could, by itself or together with one or more other factors, adversely affect our business, results of operations and/or financial condition. Additional risks and uncertainties not currently known to us or that we currently consider to not be material also may materially and adversely affect us. In assessing these risks, you should also refer to other information disclosed in our SEC filings, including the financial statements and notes thereto.

MARKET AND LIQUIDITY RISKS

Challenging economic conditions or volatility in the financial markets could have a material adverse impact on our business, leading to diminished financial results and position.

Our profitability depends to a large extent on IBERIABANK’s net interest income, which is the difference between income on interest-earning assets, such as loans and investment securities, and expense on interest-bearing liabilities, such as deposits and borrowings. We are unable to predict changes in market interest rates, which are affected by many factors beyond our control, including inflation, recession, unemployment, money supply, competition for loans and deposits, domestic and international events and changes in the United States and other financial markets.

Although the general economic environment has shown improvement since the end of the economic recession in June 2009, there can be no assurance that improvement will continue. Economic growth has been slow and uneven, and continuing concerns over the federal deficit and government spending have contributed to diminished expectations for the economy. A return of recessionary conditions, including declines in real estate values and sales volumes, an increase in unemployment, and/or continued negative developments in the domestic and international credit markets may significantly affect economic conditions in the market areas in which we do business, the value of our loans and investments, supply of and demand for deposits, and our ongoing operations, costs and profitability.

In addition, geopolitical matters, including international political unrest, slow growth in the global economy, continued concerns over the oil supply and depressed energy prices, as well as acts of terrorism, war and other violence could result in further disruptions in the financial markets. These negative events could have a material adverse effect on our results of operations and financial condition, including our liquidity position, and may affect our ability to access capital.

The geographic concentration of our markets makes our business highly susceptible to local economic conditions. Adverse economic factors affecting particular geographies or industries, especially the Southeastern U.S. or the energy industry, could have a negative effect on our customers and their ability to make payments to us.

Unlike larger organizations that are more geographically diversified, our offices are primarily concentrated in selected markets in Louisiana, Alabama, Arkansas, Florida, Georgia, Tennessee and Texas. As a result of this geographic concentration, our financial results depend largely upon economic conditions in these market areas.

Certain industry-specific economic factors affect these geographies. Approximately 4.8% of our total loan portfolio at December 31, 2015 was comprised of loans to borrowers in the energy industry, primarily in Louisiana and Texas. The energy industry is historically cyclical and is currently experiencing a significant and prolonged decline in crude oil prices caused by increased domestic and international production, leading to excess supply, coupled with slowing global economic growth and weaker global demand. In January 2016, oil prices reached a 12-year low at less than $27 per barrel. In addition, the lifting of international economic sanctions on Iran could lead to additional supply and further deterioration of oil prices in 2016.

A continued severe and prolonged depression in commodity prices would adversely affect the energy industry and the broader financial markets, and consequently negatively impact our business. A downturn in segments of the commercial and residential real estate industries in our markets due to adverse economic factors affecting particular industries could have an adverse effect on our customers. Deterioration in economic conditions in the markets we serve could result in one or more of the following:

• an increase in loan delinquencies;

• an increase in problem assets and foreclosures;

• a decrease in the demand for our products and services;

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• a decrease in the value of collateral for loans, especially real estate, in turn reducing customers’ borrowing power, the value of assets associated with problem loans and collateral coverage;

• a decrease in supply of customer deposits, which could impact our liquidity.

The Government’s responses to economic conditions may adversely affect our financial performance.

The Federal Open Market Committee (“FOMC”) of the Federal Reserve Board (“FRB”), in an attempt to stimulate the overall economy, has, among other things, kept interest rates low through its targeted federal funds rate. In December 2015, the FOMC voted to raise the target federal funds rate for the first time since 2006. The FOMC expects that economic conditions will evolve in a manner that will warrant only gradual increases in the federal funds rate over the next several years. As the FOMC increases the federal funds rate, it is possible that overall interest rates could rise, which may negatively impact the U.S. real estate markets and economic recovery. In addition, deflationary pressures, while possibly lowering our operating costs, could have a significant negative effect on our borrowers, especially our business borrowers, and the values of collateral securing loans, which could negatively affect our financial performance.

Changes in interest rates and other factors beyond our control may adversely affect our earnings and financial condition, and we may incur losses if we are unable to successfully manage interest rate risk.

Our net interest income may be reduced if more interest-earning assets than interest-bearing liabilities reprice or mature during a period when interest rates are declining, or more interest-bearing liabilities than interest-earning assets reprice or mature during a period when interest rates are rising.

Changes in the difference between short- and long-term interest rates may also harm our business. For example, short-term deposits may be used to fund longer-term loans. When differences between short-term and long-term interest rates shrink or disappear, as is possible in the current low interest rate policy environment, the spread between rates paid on deposits and received on loans could narrow significantly, thereby decreasing our net interest income.

If market interest rates rise rapidly, interest rate adjustment caps may limit increases in interest rates on adjustable rate loans, thereby reducing our net interest income. Similarly, interest rate adjustment floors may limit the upside benefit to increases in interest rates. In the event that market interest rates fall rapidly, loan and bond prepayments may occur as borrowers refinance and pay off debt prior to stated maturity. As a result, yields on earning assets could decline, thereby reducing net interest income. If an unprecedented negative rate environment were to occur, our operations and margin would be adversely impacted and could result in increased credit losses.

We attempt to manage our risk from changes in market interest rates by adjusting the rates, maturity, repricing characteristics, and balances of the different types of interest-earning assets and interest-bearing liabilities. Interest rate risk management techniques are not exact. We employ the use of models and modeling techniques to quantify the levels of risks to net interest income, which inherently involve the use of assumptions, judgments, and estimates. While we strive to ensure the accuracy of our modeled interest rate risk profile, there are inherent limitations and imprecisions in this determination and actual results may differ. As of December 31, 2015, a 100 basis point instantaneous and parallel upward shift in interest rates at December 31, 2015, was estimated to increase net interest income over 12 months by approximately 4.9%. Similarly, a 100 basis point decrease in interest rates was expected to decrease net interest income by 4.5% over the same period.

At December 31, 2015, approximately 48% of our total loan portfolio had fixed interest rates. Eliminating fixed rate loans that mature within a one-year time frame decreases this percentage to approximately 32% at December 31, 2015. Over 90% of the investment portfolio had fixed interest rates as of December 31, 2015. Approximately 65% of our time deposit base and 51% of our Federal Home Loan Bank ("FHLB") borrowings will re-price within 12 months.

If we or our subsidiaries were unable to borrow funds through access to capital markets, we may not be able to meet the cash flow requirements of our depositors and borrowers, or the operating cash needs to fund corporate expansion and other corporate activities.

Liquidity is the ability to meet cash flow needs on a timely basis at a reasonable cost. IBERIABANK’s liquidity primarily is used to make loans and to repay deposit liabilities as they become due or are demanded by customers. Liquidity policies and limits are established by our Board of Directors. Management and the Investment Committee regularly monitor the overall liquidity position of IBERIABANK and the Company to ensure that various alternative strategies exist to cover unanticipated events that could affect liquidity. Management and the Investment Committee also establish policies and monitor guidelines to

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diversify IBERIABANK’s funding sources to avoid concentrations in any one market source. Funding sources include federal funds purchased, securities sold under repurchase agreements, customer deposits, and short- and long-term debt. IBERIABANK is also a member of the FHLB System, which provides funding through advances to members that are collateralized with mortgage-related assets.

We maintain a portfolio of securities that can be used as a secondary source of liquidity. There are other sources of liquidity available to us should they be needed. These sources include sales or securitizations of loans, our ability to acquire additional national market, non-core or brokered deposits, additional collateralized borrowings such as the FRB discount window, the issuance and sale of debt securities, and the issuance and sale of preferred or common securities in public or private offerings. Amounts available under our existing credit facilities as of December 31, 2015 consist of $4.6 billion in FHLB availability and $155 million in the form of federal funds lines and $25 million in other lines of credit.

If we were unable to access any of these funding sources when needed, we might be unable to meet customers’ needs, which could adversely impact our financial condition, results of operations, cash flows, and level of regulatory-qualifying capital.

Additionally, the Company is often the recipient of dividends from its subsidiaries, including IBERIABANK, and may rely on these dividends as a source of cash flow. The amount of future dividends from IBERIABANK is dependent upon its performance and could be impacted by future unanticipated economic conditions and regulatory limitations. Such events could impact the Company’s ability to declare future dividends and ultimately its solvency if other sources of cash flows were not available.

Deposit run-off or a change in deposit mix could increase our funding costs.

A major portion of our net income comes from our interest rate spread, which is the difference between the interest rates paid by us on amounts used to fund assets and the interest rates and fees we receive on our interest-earning assets. We rely on deposits as a stable, low-cost source of funding for our interest-earning assets. We must compete with other banks and financial institutions for deposits. If our competitors raise rates on their deposits, we may face deposit attrition or experience higher funding costs by increasing our deposit rates in order to maintain our customer deposit base. Higher funding costs would increase interest expense, thereby reducing our net interest margin, net interest income, and net income. As of December 31, 2015, approximately 27% of our deposits were non-interest-bearing.

Market perceptions of our credit risk could impair our liquidity, cash flows, financial condition and operating results.

Our liquidity and borrowing costs are largely impacted by our credit risk. Market perception, given the lack of a public credit rating, could have an adverse effect on our ability to access capital markets or borrow funds and increase the costs of capital and borrowings. In addition, deterioration in our credit risk, whether actual or perceived, could trigger unfavorable contractual obligations, resulting in the requirement to post additional collateral or realize credit-related contingent features.

CREDIT RISKS

Like most banking organizations, our business is highly susceptible to credit risk.

As a lender, we are exposed to the risk that our customers will be unable to repay their loans according to their terms and that the collateral securing the payment of their loans (if any) may not be sufficient to satisfy our customers’ loan obligations in the event of default. Credit losses could have a material adverse effect on our operating results.

As of December 31, 2015, our total loan portfolio was approximately $14.3 billion, or 73% of total assets. At that date, the major components of our loan portfolio comprised 71% commercial loans (42% real estate, 24% commercial and industrial, and 5% energy), 8% mortgage loans (primarily residential 1-4 family mortgage loans), and 21% consumer loans. Our credit risk with respect to our consumer installment and commercial loan portfolios relates principally to the general creditworthiness of individuals and businesses within our local market areas. Our credit risk with respect to our residential and commercial real estate mortgage and construction loan portfolios relates principally to the general creditworthiness of individuals and businesses, the value of real estate as collateral, and guarantors serving as security for the repayment of the loans.

Our loan portfolio has been and will continue to be affected by real estate markets. Real estate industry pricing dynamics in the geographical markets we operate can vary from year to year, and with respect to construction, can vary between project

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funding and project completion. Asset values to which we underwrite loans can fluctuate from year to year and impact collateral values and the ability of our borrowers to repay their loans. An additional risk in connection with loans secured by commercial real estate is the effect of unknown or unexpected environmental contamination, which could make the real estate effectively unmarketable or otherwise significantly reduce its value as security, or could expose us to remediation liabilities as the lender. In addition, the energy industry is currently experiencing a significant and prolonged decline in crude oil prices caused by oversupply and weaker global demand, which is having a negative impact on both commercial and consumer borrowers. We make credit and reserve decisions based on the current conditions of borrowers or projects combined with our expectations for the future. If a deterioration in economic conditions or prices beyond our expectations were to occur in any of the market areas we serve, we could experience higher charge-offs and delinquencies above amounts provided for in the allowance for credit losses. As such, our earnings could be adversely affected through higher than anticipated provisions for loan losses.

Our allowance for credit losses may not be sufficient to cover actual credit losses, which could adversely affect our earnings. Events unforeseen by us could result in higher loan losses impacting our results of operations.

We maintain an allowance for credit losses (“allowance”) in an attempt to cover losses inherent in our loan portfolio (funded and unfunded). Additional loan losses will likely occur in the future and may occur at a rate greater than we have experienced to date based on unanticipated adverse changes and/or new facts and circumstances which are currently not available to management as of the respective reporting period. Increases in the allowance will result in decreases in our earnings.

The determination of the allowance, which represents management’s estimate of probable losses inherent in our credit portfolio, involves a high degree of judgment and complexity. Changes in these estimates (i.e., creditworthiness) may have a significant impact on our financial statements. If our assumptions and judgments require modifications, our current allowance may not be sufficient and adjustments may be necessary to allow for different economic conditions or adverse developments in our loan portfolio. Further, changes in market factors, such as interest rates or commodity prices, could lead to increases in the allowance. While management monitors these market dynamics carefully, adverse changes to these factors could be unforeseen by management and would result in higher levels of allowance and credit losses. For example, unanticipated adjustments to management’s current expectations in commodity prices (e.g., oil) could have an adverse impact to the allowance as the borrower’s ability to repay within the terms of the contractual agreement may be reduced due to a lack of sufficient free cash flows, estimated collateral values may decline given the lack of market demand for collateralized assets (e.g., equipment, pipelines, etc.), and the Company’s ability to monetize guarantor support may be impaired as guarantor net worth may diminish.

Commercial and commercial real estate loans generally are viewed as having more risk of default than residential real estate loans or other loans or investments. These types of loans are also typically larger than residential real estate loans and other consumer loans. Because the loan portfolio contains a significant number of commercial and commercial real estate loans with relatively large balances, the deterioration of a material amount of these loans may cause a significant increase in nonperforming assets, TDRs and/or past due loans. An increase in nonperforming assets, TDRs, and/or past due loans could result in a loss of earnings, an increase in the provision for credit losses, or an increase in loan charge-offs, which would have an adverse impact on our results of operations and financial condition. Our emphasis on loan growth and on increasing our portfolio of multi-family, commercial business and commercial real estate loans, as well as any future credit deterioration, could also require us to increase our allowance further in the future.

In addition, bank regulators periodically review our allowance and may require us to increase our provision for credit losses or recognize further loan charge-offs.

We earn a significant portion of our non-interest revenue through sales of residential mortgages in the secondary market. We are exposed to counterparty credit, market, repurchase and other risks associated with these activities.

Our non-interest revenue attributable to mortgage banking activities has grown significantly in recent years. The Company is exposed to counterparty credit risk in the normal course of these sales activities as well as market risk when engaging in these activities that is greatly impacted by the amount of liquidity in the secondary markets and changes in interest rates. Additionally, the Company retains repurchase risk associated with sales of these loans that is related to the Company’s residential mortgage loan underwriting and closing practices. Increases in claims under these repurchase or make-whole demands, which typically arise when a borrower defaults, could have a material impact on our ability to continue participating in these types of activities as well as a material impact on our financial condition, results of operations, and cash flows.

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The protections afforded through the loss share agreements with the FDIC could be compromised by factors outside of the Company’s control, resulting in significant losses.

The loss share agreements associated with our FDIC-assisted transactions represented $40 million on our consolidated balance sheet as of December 31, 2015.  To the extent that loss share coverage ends prior to events that would allow the Company to collect these amounts, future impairments would be required.  The terms of the loss share agreements require us to remit to the FDIC recoveries on prior loss claims on certain loans within our portfolio, which could negatively impact our net income subsequent to loss share termination.  Application of the terms and conditions of loss share agreements is subject to the interpretation by the FDIC. To the extent the FDIC develops new or differing interpretations of the terms and conditions of loss share agreements, our indemnification assets could become impaired or we could be required to refund the FDIC for payments previously received.

Declines in the value of certain investment securities could require write-downs, which would reduce our earnings.

Our securities portfolio includes securities that are subject to declines in value due to negative perceptions about the health of the financial sector in general and the lack of liquidity for securities that are real estate related. A prolonged decline in the value of these or other securities could result in an other-than-temporary impairment write-down, which would reduce our earnings. In the case of issuer default, a permanent impairment could be required that would reduce our earnings.

If our investment in the common stock of the FHLB of Dallas is classified as other-than-temporarily impaired or as permanently impaired, our earnings and stockholders’ equity could decrease.

We hold FHLB stock to qualify for membership in the FHLB System and to be eligible to borrow funds under the FHLB advance program. The aggregate cost and fair value of our FHLB common stock as of December 31, 2015 was $16 million based on its par value. There is no market for FHLB common stock.

Published reports indicate that certain member banks of the FHLB System may be subject to accounting rules and asset quality risks that could result in materially lower regulatory capital levels. In an extreme situation, it is possible that the capital of a FHLB could be substantially diminished or reduced to zero. Consequently, we believe that there is a risk that our investment in FHLB common stock could be impaired at some time in the future and, if this occurs, it would cause our earnings and stockholders’ equity to decrease by the after-tax amount of the impairment charge.

REGULATORY/COMPLIANCE RISK

Changes in government regulations and legislation could limit our future performance and growth.

The banking industry is heavily regulated. We are subject to examination, supervision and comprehensive regulation by various federal and state agencies. Our compliance is costly and restricts certain of our activities. Banking regulations are primarily intended to protect the federal deposit insurance fund and depositors, not shareholders. The burdens imposed by federal and state regulations put banks at a competitive disadvantage compared to less regulated competitors, such as finance companies, mortgage banking companies and leasing companies. Changes in the laws, regulations and regulatory practices affecting the banking industry may increase our costs of doing business or otherwise adversely affect us and create competitive advantages for others. Regulations affecting banks and financial services companies undergo continuous change and are subject to interpretation. We cannot predict the ultimate effect of these changes or interpretations, which could have a material adverse effect on our profitability or financial condition.

The ongoing implementation of the Dodd-Frank Act and related rules and regulations may adversely affect our business, financial condition and results of operations.

The Dodd-Frank Act contains a variety of far-reaching changes and reforms for the financial services industry and directed federal regulatory agencies to study the effects of, and to issue implementing regulations for, these reforms. Many of the provisions of the Dodd-Frank Act could have a direct effect on our performance and, in some cases, impact our ability to conduct business. Examples of these provisions include, but are not limited to:

• Creation of the Financial Stability Oversight Council that may recommend to the FRB increasingly strict rules

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for capital, leverage, liquidity, risk management and other requirements as companies grow in size and complexity;

• Application of the same leverage and risk-based capital requirements that apply to insured depository institutions to most bank holding companies, such as IBERIABANK Corporation;

• Changes to the assessment base used by the FDIC to assess insurance premiums from insured depository institutions and increases to the minimum reserve ratio for the Deposit Insurance Fund (“DIF”), from 1.15% to not less than 1.35%, with provisions to require institutions with total consolidated assets of $10 billion or more, like us, to bear a greater portion of the costs associated with increasing the DIF’s reserve ratio;

• Repeals of the federal prohibitions on the payment of interest on demand deposits, thereby permitting depository institutions to pay interest on business transaction and other accounts;

• Establishment of the Consumer Financial Protection Bureau, or CFPB, with broad authority to write rules, and implement and enforce consumer financial protection laws, including the authority to prohibit “unfair, deceptive, and abusive practices.” The CFPB has examination and enforcement authority over all banks with $10 billion or more in assets, like IBERIABANK, with respect to compliance with consumer financial protection laws;

• Implementation of risk retention rules for loans (excluding qualified residential mortgages) that are sold by a bank;

• Amendment of the Electronic Fund Transfer Act to, among other things, authorize the FRB to issue rules limiting debit-card interchange fees (referred to as the “Durbin Amendment”); and

• New restrictions on compensation, including a prohibition on incentive-based compensation arrangements that encourage inappropriate risk-taking by covered financial institutions and are deemed to be excessive or that may lead to material losses,

    Many of these provisions have already been the subject of proposed and final rulemakings. Some other provisions, however, remain subject to final regulatory rulemaking and implementation, the effects of which are not yet known. The provisions of the Dodd-Frank Act and any rules adopted to implement those provisions, as well as any additional legislative or regulatory changes, may impact the profitability of our business activities, may require that we change certain of our business practices, may materially affect our business model or affect retention of key personnel, may require us to raise additional capital and could expose us to additional costs (including increased compliance costs). These and other changes may also require us to invest significant management attention and resources to make any necessary changes and may adversely affect our ability to conduct our business as previously conducted or our financial condition and results of operations.

In addition, the Dodd-Frank Act requires us to submit a stress test to the FRB that projects the Company’s performance under various economic scenarios provided by the FRB. We are required to make certain assumptions in modeling future performance and must support these assumptions through statistical analysis and observed market behavior where applicable. The outcome of the FRB’s analysis of the Company’s projected performance (to include capital, earnings, and balance sheet changes) could hinder our ability to pay cash dividends to shareholders as has been the Company’s practice. The results of the stress test could also impact the FRB’s future decision making regarding future acquisitions by the Company.

We have become subject to more stringent regulatory capital requirements, which may limit our operations and potential growth or adversely affect our ability to pay dividends or to repurchase shares.

The Company and IBERIABANK are subject to the comprehensive, consolidated supervision and regulation of the FRB and the Louisiana Office of Financial Institutions, including risk-based and leverage capital requirements. We must maintain certain risk-based and leverage capital ratios as required by our banking regulators, which can change depending on general economic conditions and the Company’s particular condition, risk profile, growth plans, and regulatory capital adequacy guidelines. If at any time we fail to meet minimum established capital guidelines and/or other regulatory requirements, our financial condition would be materially and adversely affected.

In July 2013, U.S. banking regulatory agencies, including the FRB, approved a final rule to implement the revised capital adequacy standards of the Basel Committee, or “Basel III”, and to address relevant provisions of the Dodd-Frank Act. We became subject to the new rule on January 1, 2015, and certain provisions of the new rule will be phased in from that date to

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January 1, 2019.

The final rule:

• Requires that non-qualifying capital instruments, including trust preferred securities and cumulative perpetual preferred stock, must be fully phased out of Tier 1 capital by January 1, 2016;

• Establishes new qualifying criteria for regulatory capital, including new limitations on the inclusion of deferred tax assets and mortgage servicing rights;

• Requires a minimum ratio of common equity Tier 1, or CET1, capital to risk-weighted assets of 4.5%;

• Increases the minimum Tier 1 capital to risk-weighted assets ratio requirements from 4% to 6%;

• Retains the minimum total capital to risk-weighted assets ratio requirement of 8%;

• Establishes a minimum leverage ratio requirement of 4%;

• Retains the existing regulatory capital framework for 1-4 family residential mortgage exposures;

• Requires a banking organization to maintain a capital conservation buffer of 2.5% (consisting of CET1 capital) above the minimum CET1 capital, Tier 1 capital and total risk-based capital ratios in order to avoid limitations on capital distributions, including dividend payments, and certain discretionary bonus payments to executive officers. The capital conservation buffer requirement will be phased in beginning on January 1, 2016 at 0.625%, and will be fully phased in at 2.5% by January 1, 2019. A banking organization with a buffer of less than the required amount would be subject to increasingly stringent limitations on such distributions and payments as the buffer approaches zero;

• Increases capital requirements for past-due loans, high volatility commercial real estate exposures, and certain short-term commitments and securitization exposures;

• Expands the recognition of collateral and guarantors in determining risk-weighted assets; and

• Removes references to credit ratings consistent with the Dodd-Frank Act and establishes due diligence requirements for securitization exposures.

Management believes that at December 31, 2015, the Company and IBERIABANK would have met all new capital adequacy requirements on a fully phased-in basis if such requirements were then effective. However, there can be no assurances that the Basel III capital rules will not be revised before the expiration of the phase-in periods. The final impact of the new capital and liquidity standards on us cannot be determined at this time and depend on a number of factors, including the treatment and implementation by U.S. banking regulators. These new requirements, however, and any other new regulations, could result in lower returns, result in regulatory actions if we were unable to comply with such requirements, and adversely affect our ability to pay dividends or repurchase shares, or to raise capital, including in ways that may adversely affect our financial condition or results of operations. Compliance with current or new capital requirements, including leverage ratios, may limit operations that require the intensive use of capital and could adversely affect our ability to expand or maintain present business levels.

Possible future increases in FDIC deposit insurance premiums would adversely affect our earnings.

Under a final rule adopted by the FDIC in 2011 to revise the federal deposit insurance system, deposit insurance assessments for all banks will be lowered starting the quarter after the ratio of the Deposit Insurance Fund’s deposit insurance reserves to estimated insured deposits (the “DRR”) reaches 1.15%, which the FDIC currently projects will be the first or second quarter of 2016. In October 2015, the FDIC issued a proposed rule that would require insured institutions with an assessment base (total assets less tangible capital) of over $10 billion to pay surcharge assessments at an annual rate of 4.5 basis points, starting the quarter after the DRR reaches 1.15% and ending when the DRR reaches 1.35% (forecast to occur by the end of 2018). The 4.5 basis point surcharge would be assessed against the assessment base of covered institutions, such as IBERIABANK, less $10 billion.

We are generally unable to control the amount of premiums that we are required to pay for FDIC insurance. If the number of bank failures increases in the future, the FDIC may set higher deposit insurance premiums or impose special assessments.

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Any future increases in FDIC deposit insurance premiums may materially adversely affect our results of operations.

Our reported financial results depend on our management’s selection of accounting methods and certain assumptions and estimates, and there may be changes in accounting policies or accounting standards that could adversely affect our financial condition and results of operations.

Our accounting policies and assumptions are fundamental to our reported financial condition and results of operations. Our management must exercise judgment in selecting and applying many of these accounting policies and methods so they comply with generally accepted accounting principles and reflect management’s judgment of the most appropriate manner to report our financial condition and results. Our management must also exercise judgment in selecting assumptions and estimates inherent in deriving certain financial statement line items. In some cases, management must select the accounting policy, method, assumption and/or estimate to apply from two or more alternatives, any of which may be reasonable under the circumstances, yet may result in our reporting materially different results than would have been reported under another acceptable alternative.

From time to time, the Financial Accounting Standards Board (“FASB”) and the SEC change the financial accounting and reporting standards that govern the form and content of our external financial statements.  Recently, the FASB has proposed new accounting standard updates related to the calculation of the allowance for credit losses and accounting for leases, amongst other ancillary proposed updates.  The FASB has also issued final accounting standard updates which are not yet effective.  A discussion of the recent significant accounting standard updates which have been issued are included in the notes to our consolidated financial statements. Accounting standard updates have the potential to alter previously issued or future financial statements depending on their deviation from current standards or industry practices and the implementation method prescribed by the FASB.  In addition, accounting standard setters and those who interpret the accounting standards (such as the FASB, SEC, banking regulators and our independent registered auditors) may change or even reverse their previous interpretations or positions on how standards should be applied. Changes in financial accounting and reporting standards and changes in current interpretations may be beyond our control, can be hard to predict and could materially impact how we report our financial results and condition.

We are exposed to intangible asset risk, which could negatively impact our financial results.

In accordance with GAAP, we record assets acquired and liabilities assumed at their fair value, and, as such, acquisitions typically result in recording goodwill. We perform a goodwill evaluation at least annually to test for goodwill impairment. As part of its testing, the Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company determines the fair value of a reporting unit is less than its carrying amount using these qualitative factors, the Company compares the fair value of goodwill with its carrying amount, and then measures impairment loss by comparing the implied fair value of goodwill with the carrying amount of that goodwill. Adverse conditions in our business climate, including a significant decline in future operating cash flows, a significant change in our stock price or market capitalization, or a deviation from our expected growth rate and performance may significantly affect the fair value of our goodwill and may trigger impairment losses, which could be material to our operating results and financial position.

We completed such an evaluation for the Company during the fourth quarter of 2015 and concluded that an impairment charge was not necessary for the year ended December 31, 2015. We cannot provide assurance, however, that we will not be required to take an impairment charge in the future. Any impairment charge would have an adverse effect on our shareholders’ equity and financial results and could cause a decline in our stock price.

The required accounting treatment of troubled loans we acquired through acquisitions could result in higher net interest margins and interest income in current periods and lower net interest margins and interest income in future periods.

Under U.S. GAAP, we are required to record troubled loans acquired through acquisitions at fair value, which may underestimate or overestimate the actual performance of such loans. If these loans outperform our original fair value estimates, the difference between our original estimate and the actual performance of the loan (the “discount”) is accreted into net interest income. Thus, our net interest margins may initially appear higher. Conversely, if these loans under-perform our original fair value estimates, our net interest margins would be lower than initially estimated. We expect the yields on our loans to decline as our acquired loan portfolio pays down or matures, and we expect downward pressure on our interest income to the extent that the runoff on our acquired loan portfolio is not replaced with comparable high-yielding loans. This could result in higher net interest margins and interest income in current periods and lower net interest rate margins and interest income in future periods.

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OPERATIONAL RISKS

A failure in or an attack on our operational systems or infrastructure, or those of third parties, could impair our liquidity, disrupt our business, result in the unauthorized disclosure of confidential information, damage our reputation and cause financial losses.

Our business is dependent on our ability to process and monitor, on a daily basis, a large number of transactions, many of which are highly complex, across numerous and diverse markets. These transactions, as well as the information technology services we provide to clients, often must adhere to client-specific guidelines, as well as legal and regulatory standards. Due to the breadth of our client base and our geographical reach, developing and maintaining our operational systems and infrastructure is challenging, particularly as a result of rapidly evolving legal and regulatory requirements, technological shifts, integration of new platforms and third party relationships. Our financial, accounting, data processing or other operating systems and facilities, or those of our third party vendors, may fail to operate properly or become disabled as a result of events that are wholly or partially beyond our control, such as a spike in transaction volume, cyber attack or other unforeseen catastrophic events, which may adversely affect our ability to process transactions or services.

In addition, our operations rely on the secure processing, storage and transmission of confidential and other information on our computer systems and networks, as well as those of our third party vendors. Although we take protective measures to maintain the confidentiality, integrity and availability of our and our clients’ information across all geographic and product lines, and endeavor to modify these protective measures as circumstances warrant, the nature of these threats continues to evolve. As a result, our computer systems, software and networks may be vulnerable to unauthorized access, loss or destruction of data (including confidential client information), account takeovers, unavailability of service, computer viruses or other malicious code, cyber attacks and other events that could have an adverse security impact. Despite the defensive measures we take to manage our internal technological and operational infrastructure, these threats may originate externally from third parties such as foreign governments, organized crime and other hackers, and outsource or infrastructure-support providers and application developers, or may originate internally from within our organization. Given the increasingly high volume of our transactions, certain errors may be repeated or compounded before they can be discovered and rectified.

We also face the risk of operational disruption, failure, termination or capacity constraints of any of the third parties that facilitate our business activities, including exchanges, clearing agents, clearing houses or other financial intermediaries. Such parties could also be the source of an attack on, or breach of, our operational systems, data or infrastructure. In addition, as interconnectivity with our clients grows, we increasingly face the risk of operational failure with respect to our clients’ systems.

If one or more of these cyber incidents occurs, it could potentially jeopardize the confidential, proprietary and other information processed and stored in, and transmitted through, our computer systems and networks, or otherwise cause interruptions or malfunctions in our, as well as our clients’ or other third parties’ operations, which could result in damage to our reputation, substantial costs, regulatory penalties and/or client dissatisfaction or loss. Potential costs of a cyber incident may include, but would not be limited to, remediation costs, increased protection costs, lost revenue from the unauthorized use of proprietary information or the loss of current and/or future customers, and litigation.

We maintain an insurance policy which we believe provides sufficient coverage at a manageable expense for an institution of our size and scope with similar technological systems. However, no assurance can be given that this policy would be sufficient to cover all potential financial losses, damages, penalties, including lost revenues, should we experience any one or more of our or a third party’s systems failing or experiencing attack.

The loss of certain key personnel could negatively affect our operations.

Although we have employed a significant number of additional executive officers and other key personnel, our success continues to depend in large part on the retention of a limited number of key executive management, lending and other banking personnel. We could undergo a difficult transition period if we were to lose the services of any of these individuals. Our success also depends on the experience of our banking facilities’ managers and lending officers and on their relationships with the customers and communities they serve. The loss of these key persons could negatively impact the affected banking operations. The unexpected loss of key senior managers, or the inability to recruit and retain qualified personnel in the future, could have an adverse effect on our business, financial condition, or operating results.

The success of bank acquisitions (which include FDIC-assisted transactions) will depend on a number of uncertain factors.

The success of our bank acquisitions depends on a number of factors, including, without limitation:

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• Our ability to integrate the businesses acquired into IBERIABANK’s current operations, including the conversion of customer loan and deposit data from the acquired banks’ data processing systems to our data processing systems;

• Our ability to limit the outflow of deposits held by our new customers in the acquired businesses and to successfully retain and manage interest-earning assets (i.e., loans) acquired;

• Our ability to attract new deposits and to generate new interest-earning assets in the geographic areas previously served by the acquired businesses;

• Our ability to effectively compete in new markets in which we did not previously have a presence;

• Our success in deploying the cash acquired in these transactions into assets bearing sufficiently high yields without incurring unacceptable risk;

• Our ability to control the incremental non-interest expense from the acquired businesses in a manner that enables us to maintain a favorable overall efficiency ratio;

• Our ability to retain and attract the appropriate personnel to staff and maintain the acquired businesses; and

• Our ability to earn acceptable levels of interest and non-interest income, including fee income, from the acquired businesses.

In any acquisition involving a financial institution, particularly one involving the transfer of a large number of bank branches and/or customers, there may be business and service changes and disruptions, including delays or errors in the data conversion process, that result in the loss of customers or cause customers to close their accounts and move their business to competing financial institutions. Integration of such acquired businesses is an operation of substantial size and expense, and may be impacted by general market and economic conditions or government actions affecting the financial services industry. Integration efforts also are likely to divert our management’s attention and resources. No assurance can be given that we will be able to integrate these acquired businesses successfully, and the integration process could result in the loss of key employees, the disruption of ongoing business, or inconsistencies in standards, controls, procedures and policies that adversely affect our ability to maintain relationships with clients, customers, depositors and employees or to achieve the anticipated benefits of bank acquisitions. We may also encounter unexpected difficulties or costs during the integration that could adversely affect our earnings and financial condition, perhaps materially. Additionally, no assurance can be given that the operation of acquired businesses will not adversely affect our existing profitability, that we will be able to achieve results in the future similar to those achieved by our existing banking business, that we will be able to compete effectively in the market areas currently served by the acquired businesses, or that we will be able to manage any growth resulting from financial institution acquisitions effectively.

Our ability to grow acquired businesses following these transactions depends in part on our ability to retain certain key branch personnel we expect to hire and/or retain in connection with these transactions. We believe that the ties these employees have in the local banking markets previously served by their acquired businesses are vital to our ability to maintain our relationships with existing customers and to generate new business in these markets. Our failure to hire or retain these employees could adversely affect the success of these transactions and our future growth.

Catastrophic events could negatively affect our local economies or disrupt our operations, which would have an adverse effect on our business or results of operations.

The occurrence of catastrophic events, including weather events and other natural disasters such as hurricanes, tropical storms, tornadoes, floods and fires, or other disasters, such as crime, terrorism and other acts of violence, could adversely affect our consolidated financial condition or results of operations. Such events can disrupt our operations, cause damage to our properties and negatively affect the local economies in which we operate. We cannot predict whether or to what extent damage that may be caused by these catastrophes will affect our operations or the economies in our market areas, but such events could result in a decline in loan originations, a decline in the value or destruction of properties securing our loans and an increase in payment delinquencies, foreclosures and loan losses.

We may be subject to increased litigation which could result in legal liability and damage to our reputation.

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The Company and IBERIABANK have been named from time to time as defendants in class actions and other litigation relating to our businesses and activities. Litigation may include claims for substantial compensatory or punitive damages or claims for indeterminate amounts of damages. We and our subsidiaries are also involved from time to time in other reviews, investigations and proceedings (both formal and informal) by governmental and self-regulatory agencies regarding our business. These matters also could result in adverse judgments, settlements, fines, penalties, injunctions or other relief.

In addition, in recent years, a number of judicial decisions have upheld the right of borrowers to sue lending institutions on the basis of various evolving legal theories, collectively termed “lender liability.” Generally, lender liability is founded on the premise that a lender has either violated a duty, whether implied or contractual, of good faith and fair dealing owed to the borrower or has assumed a degree of control over the borrower resulting in the creation of a fiduciary duty owed to the borrower or its other creditors or shareholders.

Substantial legal liability or significant regulatory action against us, including our subsidiaries, could materially adversely affect our business, financial condition or results of operations, or cause significant harm to our reputation.

STRATEGIC/REPUTATIONAL RISKS

Our financial performance will be negatively impacted if we are unable to execute our growth strategy, which includes organic growth and growth through acquisitions.

Historically, the Company has grown organically and supplemented that growth with select acquisitions. Our success depends primarily on generating loans and deposits of acceptable risk and profitability. There can be no assurance that we will be successful in continuing our organic, or internal, growth strategy. Our ability to identify appropriate markets for expansion, recruit and retain qualified personnel, and fund growth at a reasonable cost, depends upon prevailing economic conditions, maintenance of sufficient capital, competitive factors, changes in banking laws, and other factors.

Supplementing our internal growth through acquisitions is an important part of our strategic focus, and acquisitions have comprised a significant portion of our asset growth since 1995. Our acquisition efforts focus on select markets and targeted entities. We operate in markets we consider to be contiguous, or natural extensions, to our current markets. The availability of acquisition candidates that meet our strategic objectives can fluctuate, and current institutions for sale in the market may not meet our strategic objectives. Such circumstances would limit our ability to supplement our growth through acquisitions. As consolidation of the banking industry continues, the competition for suitable acquisition candidates may increase. We compete with other banking organizations for acquisition opportunities, and many of these competitors have greater financial resources than we do and may be able to pay more for an acquisition than we are able or willing to pay. We also may need additional debt or equity financing in the future to fund acquisitions. We may not be able to obtain additional financing or, if available, it may not be in amounts and on terms acceptable to us. Our issuance of additional equity securities would dilute existing shareholders’ interest in us and may have a dilutive effect on our earnings per share. If we are unable to locate suitable acquisition candidates willing to combine with us on terms acceptable to us, or we are otherwise unable to obtain additional debt or equity financing necessary for us to continue making acquisitions, we would be required to find other methods to grow our business, and we may not grow at the same rate we have grown in the past, or at all.

We cannot be certain as to our ability to manage increased levels of assets and liabilities without increased expenses and higher levels of nonperforming assets. We may be required to make additional investments in equipment and personnel to manage higher asset levels and loan balances, which may adversely affect earnings, shareholder returns, and our efficiency ratio. Increases in operating expenses or nonperforming assets may decrease our earnings and the value of our common stock.

In addition to the normal operating challenges inherent in managing a larger financial institution, each of our acquisitions and potential future acquisitions is subject to appropriate regulatory approval. Our regulators may require that we demonstrate that we have appropriately integrated our prior acquisitions, or any future acquisitions we may do, before permitting us to engage in any future material acquisitions.

The modeled returns of bank acquisitions will depend on a number of uncertain factors, and actual results could differ materially from our expectations.

We undertake a process in performing due diligence on bank acquisition targets. While this process attempts to be comprehensive, factors can arise that were not discovered or anticipated by us in this exercise. Additionally, our modeled returns are based on a variety of assumptions to include synergies, cost savings, credit losses, growth, and the fair value of

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assets, liabilities and contracts acquired. To the extent such factors arise or actual results differ from our assumptions, our actual shareholder returns on any given bank acquisition could differ materially from our modeled expectations.

Our ability to achieve expense reduction and earnings enhancement initiatives may be adversely affected by external factors not within our control.

We continue to assess and implement a number of expense reduction and revenue enhancement initiatives that are expected to result in estimated annual incremental run-rate benefits. While many of the elements necessary to achieve these initiatives are within our control, others such as interest rates and prevailing economic conditions, which influence expenses and revenues, depend on external factors not within our control, and there can be no assurance that external factors will not materially adversely affect our ability to fully implement and accomplish these initiatives.

Our success depends on our ability to respond to the threats and opportunities of fintech innovation.

Fintech developments, such as bitcoin, have the potential to disrupt the financial industry and change the way banks do business. Investment in new technology to stay competitive would result in significant costs and increased risks of cyber security attacks. Our success depends on our ability to adapt to the pace of the rapidly changing technological environment, which is crucial to retention and acquisition of customers.

We face substantial competition and are subject to certain regulatory constraints not applicable to some of our competitors, whichmay decrease our growth or profits.

We face substantial competition for deposits, and for credit, title and trust relationships, and other financial services and products in the communities we serve. Competing providers include other banks, thrifts and trust companies, insurance companies, mortgage banking operations, credit unions, finance companies, title companies, money market funds and other financial and nonfinancial companies which may offer products functionally equivalent to those offered by us. Competing providers may have greater financial resources than we do and offer services within and outside the market areas we serve. In addition to this challenge of attracting and retaining customers for traditional banking services, our competitors include securities dealers, brokers, mortgage bankers, investment advisors and finance and insurance companies who seek to offer one-stop financial services to their customers that may include services that financial institutions have not been able or allowed to offer to their customers in the past. The increasingly competitive environment is primarily a result of changes in regulation, changes in technology and product delivery systems and the accelerating pace of consolidation among financial service providers. If we are unable to adjust both to increased competition for traditional banking services and changing customer needs and preferences, our financial performance could be adversely affected.

Some of our competitors, including credit unions, are not subject to certain regulatory constraints, such as the Community Reinvestment Act, which, among other things, requires us to implement procedures to make and monitor loans throughout the communities we serve. Credit unions also have federal tax exemptions that may allow them to offer lower rates on loans and higher rates on deposits than taxpaying financial institutions such as commercial banks. In addition, non-depository institution competitors are generally not subject to the extensive regulation applicable to institutions, like IBERIABANK, that offer federally insured deposits. Other institutions may have other competitive advantages in particular markets or may be willing to accept lower profit margins on certain products. These differences in resources, regulation, competitive advantages, and business strategy may decrease our net interest margin, may increase our operating costs, and may make it harder for us to compete profitably.

Reputational risk and social factors may impact our results.

Our ability to originate and maintain accounts is highly dependent upon consumer and other external perceptions of our business practices and/or our financial health. Adverse perceptions regarding our business practices and/or our financial health could damage our reputation in both the customer and funding markets, leading to difficulties in generating and maintaining accounts as well as in financing them. Adverse developments with respect to the consumer or other external perceptions regarding the practices of our competitors, or our industry as a whole, may also adversely impact our reputation. In addition, adverse reputational impacts on third parties with whom we have important relationships may also adversely impact our reputation. Adverse impacts to our reputation, or the reputation of our industry, may lead to greater regulatory and/or legislative scrutiny and litigation risk. We carefully monitor internal and external developments for areas of potential reputational risk and have established governance structures to assist in evaluating such risks in our business practices and decisions.

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RISKS ABOUT OUR SECURITIES

We cannot guarantee that we will pay dividends to shareholders in the future.

Cash available to pay dividends to our shareholders is derived primarily, if not entirely, from dividends paid to us from IBERIABANK. The ability of IBERIABANK to pay dividends to us, as well as our ability to pay dividends to our shareholders, is limited by regulatory and legal restrictions and the need to maintain sufficient consolidated capital. We may also decide to limit the payment of dividends on types and classes of our stock even when we have the legal ability to pay them in order to retain earnings for use in our business. There can be no assurance of whether or when we may pay dividends in the future.

Our common stock and our preferred stock are subordinate to our existing and future indebtedness.

Shares of our common stock and our Series B preferred stock are equity interests and do not constitute indebtedness of the Company. This means that shares of the common stock and depositary shares, which represent fractional interests in shares of Series B preferred stock, rank junior to all our existing and future indebtedness and our other non-equity claims with respect to assets available to satisfy claims against us, including claims in the event of our liquidation. We are prohibited from paying dividends on any of our capital stock if the required payments on our subordinated debentures have not been made.

Our common stock is subordinate to our existing and future preferred stock.

The Company has outstanding Series B preferred stock that is senior to the common stock and could adversely affect the ability of the Company to declare or pay dividends or distributions of common stock. Under the terms of the Series B preferred stock, the Company is prohibited from paying dividends on its common stock unless all full dividends for the latest dividend period on all outstanding shares of Series B preferred stock have been declared and paid in full or declared and a sum sufficient for the payment of those dividends has been set aside. Furthermore, if the Company experiences a material deterioration in its financial condition, liquidity, capital, results of operations or risk profile, the Company’s regulators may not permit it to make future payments on its Series B preferred stock, thereby preventing the payment of dividends on the common stock.

We may issue debt and/or equity securities, or securities convertible into equity securities, any of which may be senior to our existing preferred and common stock as to distributions and in liquidation, and such an issuance could negatively affect the value of our common and preferred stock.

In the future, we may attempt to increase our capital resources by entering into debt or debt-like financing that is unsecured or secured by all or up to all of our assets, or by issuing additional debt or equity securities, which could include issuances of secured or unsecured commercial paper, medium-term notes, senior notes, subordinated notes, additional shares of Series B or another class of preferred stock, or securities convertible into or exchangeable for equity securities. In the event of our liquidation, our lenders and holders of our debt and preferred securities would receive a distribution of our available assets before distributions to the holders of our common stock. Subject to certain conditions, holders of another class of preferred stock may be entitled to preferences over the Series B preferred stock. Because our decision to incur debt and issue securities in our future offerings will depend on market conditions and other factors beyond our control, we cannot predict or estimate the amount, timing or nature of our future offerings and debt financings.

The trading history of our common stock is characterized by modest trading volume.

Our common stock trades on the NASDAQ Global Select Market. During 2015, the average daily trading volume of our common stock was approximately 238,000 shares. In addition, our depositary shares, which represent fractional shares of our Series B preferred stock began trading on NASDAQ in 2015. From August 5, 2015 (the date of issuance), to December 31, 2015, the average daily trading volume of our depositary shares was approximately 13,800 shares.

We cannot predict the extent to which investor interest in us will lead to a more active trading market in our securities or how much more liquid these markets might become. A public trading market having the desired characteristics of depth, liquidity and orderliness depends upon the presence in the marketplace of willing buyers and sellers of our securities at any given time, which presence is dependent upon the individual decisions of investors, over which we have no control.

The market price of our securities can be volatile.

The market prices of our common and preferred stock may be highly volatile and subject to wide fluctuations in response to many factors, including, but not limited to, the factors discussed in other risk factors and the following:

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• our operating performance, financial condition and prospects, or the operating performance, financial condition and prospects of our competitors;

• our creditworthiness;

• prevailing in interest rates;

• changes in the legal or regulatory environments in which we operate;

• press releases, announcements or publicity relating to us or our competitors or relating to trends in our industry;

• changes in expectations as to our future financial performance, including financial estimates or recommendations by securities analysts and investors;

• future sales of our securities;

• the markets for similar securities;

• changes in economic conditions in our marketplace, general conditions in the U.S. economy, financial markets or the banking industry; and

• other developments affecting our competitors or us.

These factors may adversely affect the trading prices of our securities, regardless of our actual operating performance, and could prevent our shareholders from selling their securities at or above the public offering price. In addition, the stock markets, from time to time, experience extreme price and volume fluctuations that may be unrelated or disproportionate to the operating performance of companies. These broad fluctuations may adversely affect the market prices of our securities, regardless of our trading performance.

In the past, shareholders often have brought securities class action litigation against a company following periods of volatility in the market price of its securities. We may be the target of similar litigation in the future, which could result in substantial costs and divert management’s attention and resources.

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Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

As of December 31, 2015, we operated 320 combined offices, including 218 bank branch offices and three loan production offices in Louisiana, Arkansas, Tennessee, Alabama, Texas, Florida and Georgia, 22 title insurance offices in Arkansas and Louisiana, mortgage representatives in 68 locations in 10 states, and eight wealth management locations in five states, and one IBERIA Capital Partners L.L.C. office in Louisiana. Office locations are either owned or leased. For offices in premises leased by us or our subsidiaries, rent expense totaled $15.4 million in 2015. During 2015, we and our subsidiaries received $2.4 million in rental income for space leased to others. At December 31, 2015, there were no significantencumbrances on the offices, equipment and other operational facilities owned by us and our subsidiaries.

Additional information on our premises is provided in Note 9 to the Consolidated Financial Statements incorporated herein by reference.

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Item 3. Legal Proceedings.

The nature of the business of IBKC’s banking and other subsidiaries ordinarily results in a certain amount of claims, litigation, investigations and legal and administrative cases and proceedings, all of which are considered incidental to the normal conduct of business. Some of these claims are against entities or assets of which IBKC is a successor or acquired in business acquisitions, and certain of these claims will be covered by loss sharing agreements with the FDIC. For additional information on loss sharing agreements, see Note 7 to the consolidated financial statements. IBKC believes it has meritorious defenses to the claims asserted against it in its currently outstanding legal proceedings and, with respect to such legal proceedings, intends to continue to defend itself vigorously, litigating or settling cases according to management’s judgment as to what is in the best interest of IBKC and its shareholders.

IBKC assesses its liabilities and contingencies in connection with outstanding legal proceedings utilizing the latest information available. Where it is probable that IBKC will incur a loss and the amount of the loss can be reasonably estimated, IBKC records a liability in its consolidated financial statements. These legal reserves may be increased or decreased to reflect any relevant developments on a quarterly basis. Where a loss is not probable or the amount of loss is not estimable, IBKC does not accrue legal reserves. While the outcome of legal proceedings is inherently uncertain, based on information currently available, advice of counsel and available insurance coverage, IBKC’s management believes that it has established appropriate legal reserves. Any liabilities arising from pending legal proceedings are not expected to have a material adverse effect on IBKC’s consolidated financial position, consolidated results of operations or consolidated cash flows. However, in the event of unexpected future developments, it is possible that the ultimate resolution of these matters, if unfavorable, may be material to IBKC’s consolidated financial position, consolidated results of operations or consolidated cash flows. For additional information, see Note 19 to the consolidated financial statements.

Item 4. Mine Safety Disclosures

Not applicable.

Executive Officers of the Registrant

Set forth below is information with respect to the executive officers of IBERIABANK Corporation and principal occupations and positions held for periods including the last five years.

DARYL G. BYRD, age 61, has served as our President since 1999 and as Chief Executive Officer since 2000. He also serves as President and Chief Executive Officer of IBERIABANK.

ANTHONY J. RESTEL, age 46, has served as Senior Executive Vice President and Chief Financial Officer since 2005. Mr. Restel was hired as Vice President and Treasurer in 2001 and previously served as Chief Credit Officer of IBERIABANK.

MICHAEL J. BROWN, age 52, has served as Senior Executive Vice President since 2001. In September 2009, Mr. Brown was appointed Vice-Chairman and Chief Operating Officer. Mr. Brown is responsible for management of all of our banking markets.

JEFFERSON G. PARKER, age 63, serves as our Vice-Chairman and Managing Director of Brokerage, Trust, and Wealth Management. He has served as our Vice-Chairman since September 2009. Before his employment with the Company, Mr. Parker was a member of our Board of Directors since 2001. Prior to joining IBERIABANK, he served as President of Howard Weil, Inc., an energy research and investment banking boutique serving institutional investors.

JOHN R. DAVIS, age 55, has served as Senior Executive Vice President – Mergers and Acquisitions and Investor Relations since 2001. He also serves as Director of Financial Strategy.

ELIZABETH A. ARDOIN, age 47, joined the Company in 2002 as Senior Vice President and Director of Communications. In 2005, she was promoted to Executive Vice President continuing to serve in the same capacity for the organization. She has been Senior Executive Vice President, Director of Communications, Facilities and Human Resources since February 2013. Ms. Ardoin also serves as a director of the New Orleans Branch of the Federal Reserve Bank of Atlanta.

J. RANDOLPH BRYAN, age 48, has served as Executive Vice President and Chief Risk Officer since July 2012. Mr. Bryan previously served as Director of Strategic Initiatives and M&A prior to becoming Chief Risk Officer. Prior to joining the Company, Mr. Bryan served as Chief Operating Officer for First Southern Bancorp in Boca Raton, Florida. Prior to his experience at First Southern Bancorp, the majority of Mr. Bryan’s banking career was spent at Capital One/Hibernia National Bank, where he held a number of different leadership roles over a 13-year period, including responsibility for Capital One’s

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Banking Sales Arena, which included marketing and delivery channel management, national direct banking, customer experience, corporate communications, and public relations.

ROBERT M. KOTTLER, age 57, has served as Executive Vice President and Director of Retail and Small Business since his appointment in 2011. Prior to joining the Company, Mr. Kottler previously worked for Capital One Bank as Executive Vice President for Small Business Banking, and prior to its merger with Capital One Financial Corporation in 2005, served Hibernia Corporation as its Senior Executive Vice President and Chief Sales Support Officer. Mr. Kottler also serves as Director of Mortgage.

H. SPURGEON MACKIE, JR., age 65, has served as Executive Vice President and Chief Credit Officer since 2013. Mr. Mackie previously served as Executive Credit Officer since his appointment in 2011. Prior to joining the Company, Mr. Mackie, Jr. previously served as Executive Director of the Community Foundation of Gaston County, Inc. Prior to that role, he worked for First Union/Wachovia in numerous capacities for 32 years, including Area President, Chief Credit Officer for Interstate Banking, and Chief Risk Officer for the General Bank, among others.

ROBERT B. WORLEY, JR., age 56, has served as Executive Vice President, General Counsel and Corporate Counsel since his appointment in 2011. Before joining the Company, Mr. Worley practiced law in New Orleans with the Jones Walker law firm, where he was a partner, and had served as the Chairman of the firm’s Professional Employment Committee, was a partner in the firm and also served on the firm’s Board of Directors. Before that, Mr. Worley was a shareholder (partner) in the Kullman firm, a law firm in New Orleans. He has practiced law for 31 years.

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PART II.

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Stock Performance Graph

The following graph and table, which were prepared by SNL Financial LC (“SNL”), compares the cumulative total return on our Common Stock over a measurement period beginning December 31, 2010 with (i) the cumulative total return on the stocks included in the National Association of Securities Dealers, Inc. Automated Quotation (“NASDAQ”) Composite Index and (ii) the cumulative total return on the stocks included in the SNL > $10 Billion Bank Index. All of these cumulative returns are computed assuming the quarterly reinvestment of dividends paid during the applicable period.

	Period Ending
Index	12/31/10	12/31/11	12/31/12	12/31/13	12/31/14	12/31/15
IBERIABANK Corporation	100.00	85.56	87.61	114.94	121.02	105.08
NASDAQ Composite	100.00	99.21	116.82	163.75	188.03	201.40
SNL Bank > $10B	100.00	76.12	103.69	141.50	159.09	160.41

The stock performance graph assumes $100.00 was invested December 31, 2010. The stock price performance included in this graph is not necessarily indicative of future stock price performance.

Additional information required herein is incorporated by reference to “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Corporate Information Data” in Exhibit 13 hereto.

Share Repurchases

Share repurchases may be made from time to time, on the open market or in privately negotiated transactions, at the discretion of the management of the Company, after the Board of Directors authorizes a repurchase program. The approved share repurchase program does not obligate the Company to repurchase any dollar amount or number of shares, and the program may be extended, modified, suspended, or discontinued at any time. Stock repurchases generally are affected through

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open market purchases, and may be made through unsolicited negotiated transactions. The timing of these repurchases will depend on market conditions and other requirements.

There were no stock repurchases in 2015.

Restrictions on Dividends

Holders of the Company’s common stock are only entitled to receive dividends if, as and when the Board of Directors may declare a dividend out of funds legally available for such payments. Furthermore, holders of the common stock are subject to priority dividend rights of any holders of preferred stock then outstanding. At December 31, 2015, 8,000 shares of preferred stock were outstanding.

In addition, the terms of the Company’s outstanding junior subordinated debt securities prohibit it from declaring or paying any dividends or distributions on outstanding capital stock, or purchasing, acquiring, or making a liquidation payment on such stock, if the Company has elected to defer interest payments on such debt.

For additional information, see Note 16 of the Notes to the Consolidated Financial Statements.

Item 6. Selected Financial Data.

The information required herein is incorporated by reference to “Selected Consolidated Financial and Other Data” in Exhibit 13 hereto.

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The information required herein is incorporated by reference to “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Exhibit 13 hereto.

Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

The information required herein is incorporated by reference to “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Exhibit 13 hereto.

Item 8. Financial Statements and Supplementary Data.

The information required herein is incorporated by reference to “IBERIABANK Corporation and Subsidiaries Consolidated Financial Statements” in Exhibit 13 hereto.

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Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

As required by Rule 13a-15 under the Securities Exchange Act of 1934 (the “Exchange Act”), we performed an evaluation of the effectiveness of our disclosure controls and procedures as of December 31, 2015. The evaluation was carried out under the supervision, and with the participation of, the Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”). Based on that evaluation, the CEO and CFO have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this Report. Management’s Annual Report on Internal Control over Financial Reporting, and the attestation report of the independent registered public accounting firm, are included in Exhibit 13 and are incorporated by reference herein.

Management Report on Internal Control over Financial Reporting

The management of IBERIABANK Corporation (the “Company”) is responsible for establishing and maintaining effective internal control over financial reporting. The Company’s internal control system was designed to provide reasonable assurance to the Company’s management and Board of Directors regarding the preparation and fair presentation of the Company’s financial statements for external purposes in accordance with U.S. generally accepted accounting principles. Internal control over financial reporting includes self-monitoring mechanisms, and actions are taken to correct deficiencies as they are identified.

All internal control systems, no matter how well designed, have inherent limitations and may not prevent or detect misstatements in the Company’s financial statements, including the possibility of circumvention or overriding of controls. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of a change in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

The Company’s management assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2015. In making this assessment, it used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control—Integrated Framework (2013 Framework). Based on its assessment, management believes that, as of December 31, 2015, the Company’s internal control over financial reporting is effective based on those criteria.

The effectiveness of our internal control over financial reporting as of December 31, 2015 was audited by Ernst & Young LLP, an independent registered public accounting firm, as stated in their report appearing in Exhibit 13 to this Form 10-K.

Item 9B. Other Information.

None.

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PART III.

Item 10. Directors, Executive Officers and Corporate Governance.

Information concerning the Registrant’s executive officers is contained in Part I of this Form 10-K. Other information required herein, including information on directors, the audit committee, and the audit committee financial expert is incorporated by reference to the Proxy Statement.

Item 11. Executive Compensation.

The information required herein is incorporated by reference to the Proxy Statement.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The information required herein is incorporated by reference to the Proxy Statement.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The information required herein is incorporated by reference to the Proxy Statement.

Item 14. Principal Accounting Fees and Services.

The information required herein is incorporated by reference to the Proxy Statement.

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PART IV.

Item 15. Exhibits and Financial Statement Schedules.

(a) Documents Filed as Part of this Report.

(1) The following financial statements are incorporated by reference from Item 8 hereof (see Exhibit No. 13):

Consolidated Balance Sheets as of December 31, 2015 and 2014

Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2015, 2014, and 2013

Consolidated Statements of Shareholders’ Equity for the Years Ended December 31, 2015, 2014, and 2013

Consolidated Statements of Cash Flows for the Years Ended December 31, 2015, 2014, and 2013

Notes to Consolidated Financial Statements

(2) All schedules for which provision is made in the applicable accounting regulation of the SEC are omitted because of the absence of conditions under which they are required or because the required information is included in the consolidated financial statements and related notes thereto.

(3) The following exhibits are filed as part of this Form 10-K, and this list includes the Exhibit Index.

Exhibit Index
Exhibit No. 2.1	Purchase and Assumption Agreement dated as of August 21, 2009, by and among the Federal Deposit Insurance Corporation, Receiver of CapitalSouth Bank, IBERIABANK, and the Federal Deposit Insurance Corporation – incorporated herein by reference to Exhibit 2.1 to the Registrant’s Current Report on Form 8-K dated August 21, 2009.
Exhibit No. 2.2	Purchase and Assumption Agreement dated as of November 13, 2009, by and among the Federal Deposit Insurance Corporation, Receiver of Orion Bank, IBERIABANK, and the Federal Deposit Insurance Corporation – incorporated herein by reference to Exhibit 2.1 to the Registrant’s Current Report on Form 8-K dated November 13, 2009.
Exhibit No. 2.3	Purchase and Assumption Agreement dated as of November 13, 2009, by and among the Federal Deposit Insurance Corporation, Receiver of Century Bank, A Federal Savings Bank, IBERIABANK, and the Federal Deposit Insurance Corporation – incorporated herein by reference to Exhibit 2.2 to the Registrant’s Current Report on Form 8-K dated November 13, 2009.
Exhibit No. 3.1	Articles of Incorporation, as amended – incorporated herein by reference to Exhibit 3.1 to the Registrant’s Quarterly Report on Form 10-Q filed on August 10, 2015.
Exhibit No. 3.2	Bylaws of the Company, as amended – incorporated herein by reference to Exhibit 3.1 to Registrant’s Current Report on Form 8-K dated March 25, 2013.
Exhibit No. 4.1	Stock Certificate – incorporated herein by reference to Registration Statement on Form S-8 (File No. 33-93210).
Exhibit No. 4.2	Deposit Agreement, among IBERIABANK Corporation, Computershare Inc., and Computershare Trust Company and the holders from time to time of Depositary Receipts described therein, dated August 5, 2015 - incorporated by reference to Exhibit 4.1 to the Registrant's Current Report on Form 8-K, dated August 5, 2015
	By executing this Form 10-K, the Registrant hereby agrees to deliver to the Commission upon request copies of instruments defining the rights of holders of long-term debt of the Registrant or its consolidated subsidiaries or its unconsolidated subsidiaries for which financial statements are required to be filed, where the total amount of such securities authorized thereunder does not exceed 10 percent of the total assets of the Registrant and its subsidiaries on a consolidated basis.
Exhibit No. 10.1	Retirement Savings Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005.
Exhibit No. 10.2	Employment Agreement with Daryl G. Byrd, as amended and restated – incorporated herein by reference to Exhibit 10.4 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2001.
Exhibit No. 10.3	Indemnification Agreements with Daryl G. Byrd and Michael J. Brown – incorporated herein by reference to Exhibit 10.5 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 1999.
Exhibit No. 10.4	Severance Agreements with Michael J. Brown and John R. Davis – incorporated herein by reference to Exhibit 10.6 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2000.

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Exhibit No. 10.6	Severance Agreement with Anthony J. Restel – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2005.
Exhibit No. 10.7	1996 Stock Option Plan – incorporated herein by reference to Exhibit 10.1 to Registration Statement on Form S-8 (File No. 333-28859).
Exhibit No. 10.8	1999 Stock Option Plan – incorporated herein by reference to the Registrant’s definitive proxy statement dated March 19, 1999.
Exhibit No. 10.9	Recognition and Retention Plan – incorporated herein by reference to the Registrant’s definitive proxy statement dated April 16, 1996.
Exhibit No. 10.10	Supplemental Stock Option Plan – incorporated herein by reference to Exhibit 10.10 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 1999.
Exhibit No. 10.11	2001 Incentive Compensation Plan, as amended – incorporated herein by reference to the Registrant’s definitive proxy statement dated April 2, 2003.
Exhibit No. 10.12	2005 Stock Incentive Plan, as amended – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2009.
Exhibit No. 10.13	Form of Restricted Stock Award Agreement under the ISB Supplemental Stock Option Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated August 15, 2005.
Exhibit No. 10.14	Form of Acknowledgement regarding acceleration of unvested stock options granted by the Registrant – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated December 30, 2005.
Exhibit No. 10.15	Form of Restricted Stock Agreement under the IBERIABANK Corporation 2001 Incentive Compensation Plan – incorporated herein by reference to Exhibit 10.18 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005.
Exhibit No. 10.16	Form of Incentive Stock Option Agreement under the IBERIABANK Corporation 2001 Incentive Compensation Plan – incorporated herein by reference to Exhibit 10.19 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005.
Exhibit No. 10.17	Form of Restricted Stock Agreement under the IBERIABANK Corporation 2005 Stock Incentive Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated May 17, 2006.
Exhibit No. 10.18	Form of Stock Option Agreement under the IBERIABANK Corporation 2005 Stock Incentive Plan – incorporated herein by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K dated May 17, 2006.
Exhibit No. 10.19	IBERIABANK Corporation Deferred Compensation Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated December 17, 2007.
Exhibit No. 10.20	Form of Phantom Stock Award Agreement – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated November 17, 2008.
Exhibit No. 10.21	Form of Restricted Stock Agreement under the IBERIABANK Corporation 2008 Stock Incentive Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2008.
Exhibit No 10.22	Form of Stock Option Agreement under the IBERIABANK Corporation 2008 Stock Incentive Plan – incorporated herein by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2008.
Exhibit No. 10.23	IBERIABANK Corporation 2009 Phantom Stock Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated September 29, 2009.
Exhibit No. 10.24	Form of IBERIABANK Corporation Phantom Stock Unit Agreement – incorporated herein by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K dated September 29, 2009.
Exhibit No. 10.25	Form of Termination of Letter Agreement, executed by each of Messrs. Daryl G. Byrd, Anthony J. Restel, Michael J. Brown, and John R. Davis, dated March 31, 2009 – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated March 31, 2009, as amended.

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Exhibit No. 10.26	Employment Letter with Jefferson G. Parker dated September 17, 2009 – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated September 17, 2009.
Exhibit No. 10.27	Change in Control Severance Agreement with Jefferson G. Parker dated September 17, 2009 – incorporated herein by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K dated September 17, 2009.
Exhibit No. 10.28	2010 Stock Incentive Plan, as amended – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated January 18, 2010.
Exhibit No. 10.29	Form of Restricted Stock Agreement under the IBERIABANK Corporation 2010 Stock Incentive Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated May 4, 2010.
Exhibit No. 10.30	Form of Stock Option Agreement under the IBERIABANK Corporation 2010 Stock Incentive Plan – incorporated herein by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K dated May 4, 2010.
Exhibit No. 10.31	IBERIABANK Corporation Amended and Restated 2010 Stock Incentive Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated May 6, 2011.
Exhibit No. 10.32	Form of IBERIABANK Corporation Restricted Stock Agreement under the IBERIABANK Corporation 2010 Stock Incentive Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated May 6, 2013.
Exhibit No. 10.33	Change in Control Severance Agreement with Michael S. Price dated June 18, 2012 – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated June 18, 2012.
Exhibit No. 10.34	IBERIABANK Corporation 2014 Phantom Stock Plan – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated February 17, 2014.
Exhibit No. 10.35	Form of IBERIABANK Corporation Phantom Stock Unit Agreement – incorporated herein by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K dated February 17, 2014.
Exhibit No. 10.36	Form of IBERIABANK Corporation Performance Unit Agreement – incorporated herein by reference to Exhibit 10.51 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
Exhibit No. 10.37	Form of IBERIABANK Corporation Restricted Share Unit Agreement (Performance Contingent Award) – incorporated herein by reference to Exhibit 10.52 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
Exhibit No. 10.38	Form of IBERIABANK Corporation Restricted Stock Agreement – incorporated herein by reference to Exhibit 10.53 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
Exhibit No. 10.39	Form of IBERIABANK Corporation Stock Option Agreement – incorporated herein by reference to Exhibit 10.54 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
Exhibit No. 10.40	Form of Change in Control Severance Agreement – incorporated herein by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2010.
Exhibit No. 12	Computations of Earnings to Fixed Charges.
Exhibit No. 13	Annual Report to Shareholders – Portions of Annual Report to Shareholders for the year ended December 31, 2015, which are expressly incorporated herein by reference.
Exhibit No. 21	Subsidiaries of the Registrant.
Exhibit No. 23.1	Consent of Ernst & Young LLP
Exhibit No. 31.1	Certification of principal executive officer pursuant to Exchange Act Rule 13a-14(a) or 15d-14(a).
Exhibit No. 31.2	Certification of principal financial officer pursuant to Exchange Act Rule 13a-14(a) or 15d-14(a).
Exhibit No. 32.1	Certification of principal executive officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
Exhibit No. 32.2	Certification of principal financial officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

36

Exhibit No. 99.1	Purchase and Assumption Agreement dated as of July 23, 2010, by and among the Federal Deposit Insurance Corporation, Receiver of Sterling Bank, Lantana, Florida, IBERIABANK, and the Federal Deposit Insurance Corporation – incorporated herein by reference to Exhibit 99.2 to the Registrant’s Current Report on Form 8-K/A dated August 2, 2010.
Exhibit No. 99.2	Corporate Governance Guidelines, as amended – incorporated herein by reference to Exhibit 99.1 to the Registrant’s Current Report on Form 8-K dated January 27, 2012.
Exhibit No. 101.INS	XBRL Instance Document.
Exhibit No. 101.SCH	XBRL Taxonomy Extension Schema.
Exhibit No. 101.CAL	XBRL Taxonomy Extension Calculation Linkbase.
Exhibit No. 101.DEF	XBRL Taxonomy Extension Definition Linkbase.
Exhibit No. 101.LAB	XBRL Taxonomy Extension Label Linkbase.
Exhibit No. 101.PRE	XBRL Taxonomy Extension Presentation Linkbase.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	IBERIABANK CORPORATION
Date: February 29, 2016	By:	/s/ Daryl G. Byrd
		Daryl G. Byrd
		President, Chief Executive Officer and Director

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

37

Name	Title	Date
/s/ Daryl G. Byrd	President, Chief Executive Officer and Director	February 29, 2016
Daryl G. Byrd
/s/ Anthony J. Restel	Senior Executive Vice President and Chief Financial Officer	February 29, 2016
Anthony J. Restel
/s/ M. Scott Price	Senior Vice President, Corporate Controller and Chief Accounting Officer	February 29, 2016
M. Scott Price
/s/ Elaine D. Abell	Director	February 29, 2016
Elaine D. Abell
/s/ Harry V. Barton, Jr.	Director and Audit Committee Chairman	February 29, 2016
Harry V. Barton, Jr.
/s/ Ernest P. Breaux, Jr.	Director	February 29, 2016
Ernest P. Breaux, Jr.
/s/ John N. Casbon	Director	February 29, 2016
John N. Casbon
/s/ Angus R. Cooper, II	Director	February 29, 2016
Angus R. Cooper, II
/s/ William H. Fenstermaker	Chairman of the Board	February 29, 2016
William H. Fenstermaker
/s/ John E. Koerner, III	Director and Audit Committee Member	February 29, 2016
John E. Koerner, III
/s/ O. Miles Pollard, Jr.	Director and Audit Committee Member	February 29, 2016
O. Miles Pollard, Jr.
/s/ E. Stewart Shea III	Director	February 29, 2016
E. Stewart Shea III
/s/ David H. Welch	Director	February 29, 2016
David H. Welch

38

EX-12

EXHIBIT 12

COMPUTATION OF EARNINGS TO FIXED CHARGES

	Years Ended December 31,
(Dollars in thousands)	2015		2014		2013		2012		2011
Net income	$	142,844	$	105,382	$	65,128	$	76,395	$	53,538
Income tax expense	64,094		35,683		16,133		28,496		16,981
Income before income tax expense	$	206,938	$	141,065	$	81,261	$	104,891	$	70,519
Fixed charges
Interest on short-term and other borrowings	$	11,997	$	11,614	$	11,107	$	14,086	$	11,515
Fixed charges excluding interest on deposits	11,997		11,614		11,107		14,086		11,515
Interest on deposits	47,103		33,090		35,846		49,364		70,554
Fixed charges including interest on deposits	$	59,100	$	44,704	$	46,953	$	63,450	$	82,069
Preferred stock dividends (1)	—		—		—		—		—
Fixed charges including preferred stock dividends	$	59,100	$	44,704	$	46,953	$	63,450	$	82,069
Earnings for ratio computations (2)
Excluding interest on deposits	$	218,935	$	152,679	$	92,368	$	118,977	$	82,034
Including interest on deposits	$	266,038	$	185,769	$	128,214	$	168,341	$	152,588
Ratio of earnings to fixed charges (3)
Excluding interest on deposits	18.25		13.15		8.32		8.45		7.12
Including interest on deposits	4.50		4.16		2.73		2.65		1.86
Ratio of earnings to fixed charges and preferred dividends (2)
Excluding interest on deposits	18.25		13.15		8.32		8.45		7.12
Including interest on deposits	4.50		4.16		2.73		2.65		1.86

(1) On August 5, 2015, the Company issued an aggregate 3.2 million depositary shares, each representing a 1/400^th ownership interest in a share of the Company's 6.625% Fixed-to-Floating Non-Cumulative Perpetual Preferred Stock. On January 4, 2016, the Company declared a semi-annual cash dividend of $0.805 per depositary share, which was paid on February 1, 2016.

(2) Earnings are the sum of income before income tax expense and fixed charges.

(3) For the purposes of calculating the ratio of earning to fixed charges, fixed charges are the sum of interest and debt

expenses, excluding interest on deposits, and, in the second alternative, fixed charges are the sum of interest and debt

expenses including interest on deposits.

EX-13

EXHIBIT 13

This Annual Report, including the Financial Review and the Financial Statements and related Notes, contains forward-looking statements, which may include forecasts of our financial results and condition, expectations for our operations and business, and our assumptions for those forecasts and expectations. Do not unduly rely on forward-looking statements. Actual results may differ materially from our forward-looking statements due to several factors. Factors that could cause our actual results to differ materially from our forward-looking statements are described in this Report, including in the “Forward-Looking Statements” and “Risk Factors” sections, and in the “Regulation and Supervision” section of our Annual Report on Form 10-K for the year ended December 31, 2015 (“2015 Form 10-K”).

When we refer to “the Company,” “we,” “our” or “us” in this Report, we mean IBERIABANK Corporation and Subsidiaries (consolidated). When we refer to the “Parent,” we mean IBERIABANK Corporation. See the Glossary of Acronyms at the end of this Report for terms used throughout this Report.

To the extent that statements in this Report relate to future plans, objectives, financial results or performance of the Company, these statements are deemed to be forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements, which are based on management’s current information, estimates and assumptions and the current economic environment, are generally identified by use of the words “may”, “plan”, “believe”, “expect”, “intend”, “will”, “should”, “continue”, “potential”, “anticipate”, “estimate”, “predict”, “project” or similar expressions, or the negative of these terms or other comparable terminology, including statements related to the expected timing of the closing of proposed mergers, the expected returns and other benefits of the proposed mergers to shareholders, expected improvement in operating efficiency resulting from the mergers, estimated expense reductions, the impact on and timing of the recovery of the impact on tangible book value, and the effect of the mergers on the Company’s capital ratios. The Company’s actual strategies and results in future periods may differ materially from those currently expected due to various risks and uncertainties.

Actual results could differ materially because of factors such as the level of market volatility, our ability to execute our growth strategy, including the availability of future bank acquisition opportunities, unanticipated losses related to the integration of, and refinements to purchase accounting adjustments for, acquired businesses and assets and assumed liabilities in these transactions, adjustments of fair values of acquired assets and assumed liabilities and of deferred taxes in acquisitions, actual results deviating from the Company’s current estimates and assumptions of timing and amounts of cash flows, credit risk of our customers, actual results deviating from the Company's current estimates, assumptions of timing and the amount of cash flows, our ability to satisfy new capital and liquidity standards such as those imposed by the Dodd-Frank Act and those adopted by the Basel Committee and federal banking regulators, sufficiency of our allowance for loan losses, changes in interest rates, access to funding sources, reliance on the services of executive management, competition for loans, deposits and investment dollars, reputational risk and social factors, changes in government regulations and legislation, increases in FDIC insurance assessments, geographic concentration of our markets and economic and business conditions in these markets, or nationally, including the impact of oil and gas prices, rapid changes in the financial services industry, dependence on our operational, technological, and organizational systems or infrastructure and those of third-party providers of those services, hurricanes and other adverse weather events, and valuation of intangible assets. Those and other factors that may cause actual results to differ materially from these forward-looking statements are discussed in the Company’s Annual Report on Form 10-K and other filings with the Securities and Exchange Commission (the “SEC”), available at the SEC’s website, http://www.sec.gov, and the Company’s website, http://www.iberiabank.com, under the heading “Investor Relations.” All information in this discussion is as of the date of this Report. The Company undertakes no duty to update any forward-looking statement to conform the statement to actual results or changes in the Company’s expectations.

Included in this discussion and analysis are descriptions of the composition, performance, and credit quality of the Company’s loan portfolio. The Company has two primary descriptions of loans that are used to categorize the portfolio into its distinct risks and rewards to the consolidated financial statements: legacy loans and acquired loans. The accounting for acquired loans can differ materially from that of legacy loans. Additionally, certain acquired loans were acquired with loss protection provided by the FDIC, and the risks of the loans and foreclosed real estate acquired are significantly different from those assets not similarly covered by loss share agreements. Accordingly, the Company reports acquired loans subject to the loss share agreements as covered loans.

1

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

EXECUTIVE OVERVIEW

The Company is a $19.5 billion bank holding company primarily concentrated in commercial banking in the southeastern United States. We are shareholder- and client-focused, expect high performance from our associates, believe in a strong sense of community, and strive to make the Company a great place to work. The Company focuses on improving long-term shareholder returns by setting challenging financial goals and executing on these goals even when faced with difficult economic and regulatory environments. The Company believes that shareholder value is created by investing in our people to ensure that we attract, develop, and retain talented team members, providing exceptional products and services to our customers in order to grow our high-quality client base, and improving the efficiency of our operations through expense reduction and revenue enhancement initiatives. Our Company has a growth strategy that includes both organic growth and growth through acquisitions and we have successfully executed this strategy over the last decade. We are mindful of the risks associated with growth and we recognize that a robust risk management process is essential to enhance and protect shareholder value. The Company continues to invest in a comprehensive risk management structure to stay ahead of potential threats and challenges, appropriately balancing risk with profitability, and ensuring that our strategic goals deliver the intended results.

2015 Financial Performance

The Company completed an outstanding year of financial results in 2015. We achieved a record level of operating diluted EPS, identified and executed upon expense reduction and revenue enhancement initiatives to drive improvements in operating leverage and profitability, produced strong loan and deposit growth organically and through acquisitions, maintained strong credit quality metrics, and managed our risk exposure through diversification into new geographic markets and targeted reductions in energy and energy-sensitive markets and indirect automobile lending.

Highlights of the Company’s performance in 2015 include:

• Diluted EPS (GAAP) of $3.68, up 12% from $3.30 in 2014, and record level operating diluted EPS (non-GAAP) of $4.18, compared to operating diluted EPS of $3.72 in 2014 (see table 32 for reconciliation of GAAP to non-GAAP measures).

• Net interest income of $587.8 million, up 28% from $460.1 million in 2014, and net interest margin on a taxable equivalent basis of 3.55%, compared to 3.51% in 2014.

• Non-interest income of $220.4 million, up 27% from $173.6 million in 2014, including record levels of revenues in mortgage, title, treasury management, purchasing card, wealth management, retail brokerage, and client derivatives.

• Return on average assets of 0.78% and operating return on average assets (non-GAAP) of 0.88%, an increase of six basis points and seven basis points, respectively, compared to 2014.

• Efficiency ratio of 70.6%, an improvement of 416 basis points, or 4%, over 2014, and tangible operating efficiency ratio (non-GAAP) of 64.5%, compared to 68.4% in 2014.

• Net income of $142.8 million, up 35% from $105.4 million in 2014.

• Record loan originations in 2015, with legacy loans up $1.5 billion, or 16%, and total loans up $2.9 billion, or 25%, even with planned risk-related reductions of $442 million in the energy and indirect automobile lending portfolios.

• Strong credit performance with a net charge-off ratio of 0.08% of average loans, fairly consistent with 2014's ratio of 0.07% of average loans.

• Deposit growth, including the impact of acquisitions, of $3.7 billion, or 29%, over 2014.

• Issued non-cumulative perpetual preferred stock, raising $76.8 million in net proceeds, and maintained strong capital levels as our estimated Common Equity Tier 1 ratio under Basel III on a fully-phased in basis was 9.94% at December 31, 2015.

• Successfully completed 3 bank acquisitions and 5 related system conversions.

2

TABLE 1—SELECTED FINANCIAL INFORMATION

	Years Ended December 31
(Dollars in thousands)	2015			2014			2013			2012			2011
Key Ratios
Efficiency Ratio	70.57		%	74.73		%	84.50		%	77.49		%	79.50		%
Tangible operating efficiency ratio (TE) (Non-GAAP)	64.54		%	68.37		%	74.53		%	73.31		%	72.85		%
Return on average assets	0.78		%	0.72		%	0.50		%	0.63		%	0.49		%
Return on average assets, operating basis (Non-GAAP)	0.88		%	0.81		%	0.71		%	0.67		%	0.61		%
Net interest margin (TE)	3.55		%	3.51		%	3.38		%	3.58		%	3.51		%
Non-interest income	$	220,393		$	173,628		$	168,958		$	175,997		$	131,859
Non-interest income, operating (Non-GAAP)	216,360			170,871			166,624			170,026			128,384
Non-interest expense	570,305			473,614			472,796			432,185			373,731
Non-interest expense, operating (Non-GAAP)	533,845			445,094			428,254			418,174			352,334

2015 Acquisitions

Over the past 12 years, the Company has executed targeted acquisitions that would prove to be a strong strategic fit for the Company and provide additional value to existing shareholders. These acquisitions have provided significant growth and allowed for geographic, industry, and product diversification. The 2015 year was no exception, as the Company further diversified its business, expanding its presence in Florida and Georgia through the acquisitions of Florida Bank Group on February 28, 2015, Old Florida on March 31, 2015, and Georgia Commerce on May 31, 2015.

The Company acquired Florida Bank Group for total consideration of $90.5 million, which expanded its presence to the Tampa, Tallahassee, and Jacksonville, Florida markets, and included loans of $307.5 million and deposits of $392.2 million, after preliminary fair value adjustments. The Company acquired Old Florida for total consideration of $253.2 million, which added loans of $1.1 billion and deposits of $1.4 billion, after preliminary fair value adjustments, and expanded the Company's presence to the Orlando, Florida market. The Company also acquired Georgia Commerce for total consideration of $190.3 million, which established the Company's presence in the Atlanta, Georgia market, and added $793.4 million in loans and$908.0 million in deposits, after preliminary fair value adjustments.

The acquired assets and liabilities, which include preliminary fair value adjustments and are subject to change, are presented in Note 3, Acquisition Activity, to the consolidated financial statements. The following table is a summary of the Company's acquisition activity over the past five years:

3

TABLE 2—SUMMARY OF ACQUISITION ACTIVITY FROM 2011 TO 2015

(Dollars in millions)
Acquisition	Acquisition Date	Total Tangible Assets Acquired		Total Loans and Loans Held for Sale Acquired		Total Deposits Acquired		Goodwill		Other Intangible Assets
OMNI BANCSHARES, Inc.	2011	$	680.7	$	441.4	$	635.6	$	63.8	$	0.8
Cameron Bancshares, Inc.	2011	685.0		382.1		567.3		71.4		5.2
Florida Gulf Bancorp, Inc.	2012	307.3		215.8		286.0		32.4		—
Trust One Bank - Memphis Operations	2014	180.2		86.5		191.3		8.6		2.6
Teche Holding Company	2014	854.4		700.5		639.6		80.4		7.4
First Private Holdings, Inc.	2014	350.9		299.3		312.3		26.3		0.5
Florida Bank Group, Inc.	2015	537.6		307.5		392.2		15.7		4.5
Old Florida Bancshares, Inc.	2015	1,541.1		1,068.9		1,389.8		99.6		6.8
Georgia Commerce Bancshares, Inc.	2015	1,023.7		793.4		908.0		87.3		6.7
Total Acquisitions, 2011-2015		$	6,160.9	$	4,295.4	$	5,322.1	$	485.5	$	34.5

In addition, during 2014, the Company’s subsidiary, LTC, acquired certain assets from The Title Company, LLC, a title office in Baton Rouge, Louisiana, and Louisiana Abstract and Title, LLC, a title office in Shreveport, Louisiana. These two acquisitions were immaterial and the assets recognized were primarily from goodwill and additional intangible assets.

The Company believes these acquisitions, as well as a continued focus on high quality organic growth, improvements in operating efficiency, and development of fee-based businesses, will allow the Company to achieve its long-term objectives into 2016 and continue to improve long-term shareholder value.

2016 Outlook

The Company's long-term financial goals are as follows:

• Return on Average Tangible Common Equity of 13% to 17% (operating basis);

• Tangible Operating Efficiency Ratio of less than 60%;

• Legacy Asset Quality in the top 10% of our peers;

• Double-digit percentage growth in diluted operating EPS.

Despite a challenging economic environment, as discussed below, the Company expects to meet several of these financial goals in 2016 and our 2016 budget is consistent with this achievement. The Company has budgeted operating expenses of approximately $560 million for the full year of 2016 and provision expense of $35 million. Absent an increase in interest rates, the budgeted margin for 2016 is projected to be 3.55% and budgeted 2016 operating EPS is in line with current street expectations of $4.58. The Company believes that its market diversification will limit the impact of the deteriorating market conditions in west Louisiana and Houston, Texas due to the decline in energy prices and related uncertainty in the energy sector.

Excess oil supply and weakening global demand have weighed heavily on oil prices, which reached a 12-year low at less than $27 per barrel in January 2016. The Company remains cautious regarding the effects on its markets most impacted by the oil and gas industry. The Company has made a concerted effort through stringent underwriting standards and conservative concentration limits to balance risk and return as it relates to energy exposures. We have managed our risk through targeted reductions in energy-related loans, which are down 23% from $880.6 million, or 7.7% of our total loan portfolio at December 31, 2014, to $680.8 million, or 4.8% of our total loan portfolio at December 31, 2015. The Company has experienced a downward migration in energy credits as expected during 2015, with 22% of the energy loan portfolio criticized, and 12% classified, at year-end. At December 31, 2015, the Company had $26.7 million in aggregate reserves for energy-related loans, which is 4% of the energy outstandings, and covers energy NPAs of $8.4 million by 315%. The Company has not incurred any energy-related charge-offs over the past several years; however, some economic softening, as exhibited by increasing unemployment rates, is being seen in the specific market areas we operate that are most impacted by energy prices, primarily Louisiana and the Houston area of Texas. Future losses will depend on the duration and severity of the depression of commodity prices. The Company will continue to manage risk by reducing and exiting energy relationships that no longer fit our credit profile and recording an additional provision, if necessary.

4

The mortgage origination locked pipeline was $227 million at December 31, 2015, compared to $137 million at December 31, 2014. Mortgage income for the current year was $81.1 million, up $29.3 million, or 57%, from 2014. Mortgage volume in 2016 is projected to be $2.5 billion, which is consistent with 2015 actual volume. The flat production is driven by the expectation that the 2015 refinance volume will dissipate and be replaced by originations in new market areas as a result of recent acquisitions. At December 31, 2015, the commercial loan pipeline was approximately $700 million.

The Company experienced growth in its title, treasury management and client derivatives businesses in 2015. IBERIA Financial Services ("IFS") revenues increased 15% over 2014. Revenues for IBERIA Wealth Advisors ("IWA") were up 15% compared to 2014.  Assets under management at IWA were $1.4 billion at December 31, 2015, up 3% compared to December 31, 2014.  Despite stable growth in these fee income businesses, IBERIA Capital Partners L.L.C. ("ICP"), the Company's energy investment banking boutique, has faced headwinds, with revenues decreasing 29% from 2014. In 2016 the Company expects revenues for both IFS and IWA to increase approximately 7%, while revenues for ICP are expected to decrease approximately 14% from 2015.

Expense control continues to be a primary focus of the Company and includes branch efficiency efforts. During 2015, the Company closed or consolidated 11 bank branches, acquired 36 branches, and opened five branches. An additional 19 branches are scheduled to be closed or consolidated in the first quarter of 2016, resulting in projected annual net run-rate savings of at least $1 million per quarter starting in the second quarter of 2016. The Company incurred $3.4 million in net pre-tax non-operating expenses in the fourth quarter of 2015 associated with branch closures and will incur an estimated additional $2.7 million in the first quarter of 2016. The estimated pay-back period associated with branch closures and consolidations in 2016 is approximately two years.

FINANCIAL OVERVIEW

Selected consolidated financial and other data for the past five years is shown in the following tables.

TABLE 3—SELECTED CONSOLIDATED FINANCIAL AND OTHER DATA^(1,2) 

	Years Ended December 31
											2015 vs. 2014
(Dollars in thousands, except per share data)	2015		2014		2013		2012		2011		$ Change	% Change
Income Statement Data
Interest and dividend income	$	646,858	$	504,815	$	437,197	$	445,200	$	420,327	142,043	28
Interest expense	59,100		44,704		46,953		63,450		82,069		14,396	32
Net interest income	587,758		460,111		390,244		381,750		338,258		127,647	28
Provision for loan losses	30,908		19,060		5,145		20,671		25,867		11,848	62
Net interest income after provision for loan losses	556,850		441,051		385,099		361,079		312,391		115,799	26
Non-interest income	220,393		173,628		168,958		175,997		131,859		46,765	27
Non-interest expense	570,305		473,614		472,796		432,185		373,731		96,691	20
Income before income tax expense	206,938		141,065		81,261		104,891		70,519		65,873	47
Income tax expense	64,094		35,683		16,133		28,496		16,981		28,411	80
Net income	$	142,844	$	105,382	$	65,128	$	76,395	$	53,538	37,462	36
Earnings per common share – basic	$	3.69	$	3.31	$	2.20	$	2.59	$	1.88	0.38	11
Earnings per common share – diluted	3.68		3.30		2.20		2.59		1.87		0.38	12
Cash dividends per common share	1.36		1.36		1.36		1.36		1.36		—	—

5

	As of December 31
(Dollars in thousands, except per share data)											2015 vs. 2014
	2015		2014		2013		2012		2011		$ Change			% Change
Balance Sheet Data
Total assets	$	19,504,068	$	15,757,904	$	13,365,550	$	13,129,678	$	11,757,928	$	3,746,164		24	%
Cash and cash equivalents	510,267		548,095		391,396		970,977		573,296		(37,828		)	(7	)
Loans, net of unearned income	14,327,428		11,441,044		9,492,019		8,498,580		7,388,037		2,886,384			25
Investment securities	2,899,214		2,275,813		2,090,906		1,950,066		1,997,969		623,401			27
Goodwill and other intangible assets, net	765,655		548,130		425,442		429,584		401,888		217,525			40
Deposits	16,178,748		12,520,525		10,737,000		10,748,277		9,289,013		3,658,223			29
Borrowings	667,064		1,248,996		961,043		726,422		848,276		(581,932		)	(47	)
Shareholders’ equity	2,498,835		1,852,148		1,530,346		1,529,868		1,482,661		646,687			35
Book value per share (3)	58.87		55.37		51.38		51.88		50.48		3.50			6
Tangible book value per share (3) (5)	40.35		39.08		37.15		37.34		36.80		1.27			3

	As of and For the Years Ended December 31
	2015		2014		2013		2012		2011
Key Ratios (4)
Return on average assets	0.78	%	0.72	%	0.50	%	0.63	%	0.49	%
Return on average common equity	6.41		6.17		4.26		5.05		3.77
Return on average tangible common equity (5)	9.65		9.04		6.17		7.21		5.30
Equity to assets at end of period	12.81		11.75		11.45		11.65		12.61
Earning assets to interest-bearing liabilities at end of period	142.28		135.15		132.74		124.93		121.74
Interest rate spread (6)	3.41		3.40		3.26		3.43		3.34
Net interest margin (TE) (6) (7)	3.55		3.51		3.38		3.58		3.51
Non-interest expense to average assets	3.10		3.24		3.64		3.57		3.43
Efficiency ratio (8)	70.57		74.73		84.60		77.49		79.50
Tangible operating efficiency ratio (TE) (Non-GAAP) (5)(7) (8)	64.54		68.37		74.53		73.31		72.85
Common stock dividend payout ratio	38.46		42.05		62.11		52.50		73.61
Asset Quality Data (Legacy)
Non-performing assets to total assets at end of period (9)	0.42	%	0.41	%	0.61	%	0.69	%	0.86	%
Allowance for credit losses to non-performing loans at end of period (9)	209.41		246.26		175.35		150.57		132.98
Allowance for credit losses to total loans at end of period	0.96		0.91		0.95		1.10		1.40
Consolidated Capital Ratios
Tier 1 leverage capital ratio	9.52	%	9.35	%	9.70	%	9.70	%	10.45	%
Common Equity Tier 1 (CET1)	10.07		N/A		N/A		N/A		N/A
Tier 1 risk-based capital ratio	10.70		11.17		11.57		12.92		14.94
Total risk-based capital ratio	12.14		12.30		12.82		14.19		16.20

6

(1) Certain balances and amounts have been restated for the effect of the adoption of ASU No. 2014-01 on January 1, 2015.

(2) 2011 data is impacted by the Company’s acquisitions of OMNI and Cameron on May 31, 2011 and FTC on June 14, 2011. 2012 data is impacted by the Company’s acquisition of Florida Gulf on July 31, 2012. 2014 data is impacted by the Company’s acquisitions of certain assets and liabilities of Trust One - Memphis on January 17, 2014, Teche on May 31, 2014, and First Private on June 30, 2014. 2015 data is impacted by the Company’s acquisitions of Florida Bank Group on February 28, 2015, Old Florida on March 31, 2015, and Georgia Commerce on May 31, 2015.

(3) Shares used for book value purposes are net of shares held in treasury at the end of 2014, 2013, 2012, and 2011.

(4) With the exception of end-of-period ratios, all ratios are based on average daily balances during the respective periods.

(5) Tangible calculations eliminate the effect of goodwill and acquisition-related intangible assets and the corresponding amortization expense on a tax-effected basis where applicable.

(6) Interest rate spread represents the difference between the weighted average yield on earning assets and the weighted average cost of interest-bearing liabilities. Net interest margin represents net interest income as a percentage of average net earning assets.

(7) Fully taxable equivalent ("TE") calculations include the tax benefit associated with related income sources that are tax-exempt using a marginal tax rate of 35%.

(8) The efficiency ratio represents non-interest expense as a percentage of total revenues. Total revenues are the sum of net interest income and non-interest income.

(9) Non-performing loans consist of non-accruing loans and loans 90 days or more past due. Non-performing assets consist of non-performing loans and repossessed assets.

The Company’s net income available to common shareholders for the year ended December 31, 2015 totaled $142.8 million, or $3.68 per diluted share, compared to $105.4 million, or $3.30 per diluted share, for 2014. On an operating basis (non-GAAP), diluted EPS was $4.18, up $0.46 from $3.72 in 2014. Key components of the Company’s 2015 performance are summarized below.

• Net interest income increased $127.6 million, or 28%, in 2015 when compared to 2014, a result of a $142.0 million, or 28%, increase in interest and dividend income partially offset by a $14.4 million, or 32%, increase in interest expense. Net interest income for 2015 reflects a $3.4 billion increase in average earning assets and a five basis point increase in average yield on earning assets, offset by a $2.1 billion increase in average interest-bearing liabilities and a four basis point increase in funding costs when compared to 2014. As a result, net interest margin on a tax-equivalent basis increased four basis points to 3.55% from 3.51% when comparing the periods.

• The Company recorded a provision for loan losses of $30.9 million in 2015, $11.8 million higher than the provision recorded in 2014. The increase in the provision was due primarily to legacy loan growth ($1.5 billion, or 16%, growth since December 31, 2014), as well as an increase in legacy loan charge-offs, with relatively flat recoveries, and general energy sector weakness. As of December 31, 2015, the total allowance for loan losses as a percent of total loans was 0.97% compared to 1.14% at December 31, 2014.

• Non-interest income increased $46.8 million, or 27%, when compared to 2014, a result of a $29.3 million increase in mortgage income, a $6.6 million increase in service charges, a $2.3 million increase in title revenue, and a $2.0 million increase in ATM/debit card fee income. These increases were partially offset by a $1.1 million decrease in BOLI income and a $1.2 million decrease in broker commissions. All other non-interest income categories also increased $8.8 million due to increases in trust income, credit card income, and gain on sales of fixed assets.

• From 2014 to 2015, non-interest expense increased $96.7 million, or 20%, while operating non-interest expense increased $88.8 million, or 20%. The increase in operating non-interest expense was attributable primarily to the Company’s acquisition-driven growth over the past twelve months, including higher salary and employee benefit costs of $63.5 million and increased occupancy and equipment and other branch expenses resulting from the Company’s expanded footprint.

• The Company paid a quarterly cash dividend of $0.34 per common share in each quarter of 2015, resulting in dividends of $1.36 for the year-to-date period. These amounts were consistent with the dividends paid in 2014 and 2013.

• Total assets at December 31, 2015 were $19.5 billion, up $3.7 billion, or 24%, from December 31, 2014. Legacy loan growth of $1.5 billion across many of the Company’s markets, net increases in acquired loans of $1.4 billion, and $623.4 million in additional investment securities drove the increase in total assets.

7

• Total loans net of unearned income at December 31, 2015 were $14.3 billion, an increase of $2.9 billion, or 25%, from December 31, 2014. Loan growth during 2015 was driven by a $1.5 billion, or 16%, increase in legacy loans and a $1.4 billion, or 77%, net increase in acquired loans.

• Total deposits increased $3.7 billion, or 29%, to $16.2 billion at December 31, 2015. Non-interest-bearing deposits increased $1.2 billion, or 36%, while interest-bearing deposits increased $2.5 billion, or 27%. Acquired deposits of $2.7 billion accounted for the majority of the increase from year-end 2014, while $1.0 billion resulted from organic deposit growth. Although deposit competition remained intense, the Company was able to generate growth across many of its deposit products at reasonable rates.

• Shareholders’ equity increased $646.7 million, or 35% from year-end 2014. The increase was primarily driven by 7.5 million common shares issued in the Florida Bank Group, Old Florida, and Georgia Commerce acquisitions, which resulted in additional equity of $474.8 million. Net proceeds from the issuance of preferred stock of $76.8 million as well as undistributed net income of $87.9 million also contributed to the increase. These increases were partially offset by a $9.1 million decrease in accumulated other comprehensive income (net of tax), a result of the change in the net unrealized holding gain in the Company’s available for sale investment portfolio at the end of 2015.

APPLICATION OF CRITICAL ACCOUNTING POLICIES AND ESTIMATES

In preparing the consolidated financial statements and accompanying notes, management is required to apply significant judgment to various accounting, reporting, and disclosure matters. The accounting principles and methods used by the Company conform to GAAP and general banking accounting practices. The estimates and assumptions most significant to the Company are summarized in the following discussion and are further analyzed in the notes to the consolidated financial statements.

Allowance for Credit Losses

The allowance for credit losses has two components, the allowance for loan losses (contra asset) and the reserve for unfunded commitments (liability). Further, the allowance for loan losses consists of (i) probable incurred credit losses for legacy and acquired non-impaired loans and (ii) expected losses on acquired impaired loans.

Allowance for Legacy and Acquired Non-Impaired Loans

The legacy and acquired non-impaired ACL, which represents management’s estimate of probable losses inherent in the Company’s legacy and acquired non-impaired loan portfolio, involves a high degree of judgment and complexity. The Company’s policy is to establish reserves through provisions for credit losses on the consolidated statements of comprehensive income for estimated losses on delinquent and other problem loans, as well as loans which have not yet explicitly exhibited factors indicating credit weakness, when it is determined that losses have been incurred on such loans. Management’s determination of the appropriateness of the legacy and acquired non-impaired ACL is based on various factors requiring judgments and estimates, including management’s evaluation of the credit quality of the portfolio (determined through the assignment of risk ratings, assessments of past due status, and scores from credit agencies), historical loss experience, current economic conditions, the volume and type of lending conducted by the Company, composition of the portfolio, the amount of the Company’s classified assets, seasoning of the loan portfolio, the status of past due principal and interest payments, value of collateral, the ability to monetize guarantor support and other relevant factors. Estimates in which management exercises significant judgment are the assessments of risk ratings, collateral values, and guarantor support on the Company’s commercial loan portfolio and the application of qualitative adjustments to the quantitative measurements across all portfolios. Other changes in estimates included in the estimation of the ACL may also have a significant impact on the consolidated financial statements. For further discussion of the ACL, see Note 1, Summary of Significant Accounting Policies, and Note 6, Allowance for Credit Losses, to the consolidated financial statements.

Accounting for Acquired Impaired Loans and the Allowance for Acquired Impaired Loans

The Company accounts for its acquisitions under ASC Topic No. 805, Business Combinations, which requires the use of the acquisition method of accounting. Accordingly, all acquired loans are recorded at fair value on the acquisition date applying the fair value methodology prescribed in ASC Topic No. 820, Fair Value Measurement, and in the case of covered loans excludes the shared-loss agreements with the FDIC. No ACL related to the acquired loans is recorded on the acquisition date, as the fair value of the loans acquired incorporates assumptions regarding credit risk. The fair value measurements include estimates related to market interest rates and projections of future cash flows that incorporate expectations of prepayments and the amount and timing of principal, interest and other cash flows, as well as any shortfalls thereof.

8

Acquired loans are evaluated at acquisition and classified as purchased impaired (“acquired impaired”) or purchased non-impaired (“acquired non-impaired”). Purchased impaired loans exhibit (in management’s judgment) credit deterioration since origination to the extent that it is probable at the time of acquisition that the Company will be unable to collect all contractually required payments, and includes all covered loans. All other acquired loans are classified as purchased non-impaired.

Over the life of the purchased impaired loans, the Company continues to estimate the amount and timing of cash flows expected to be collected on individual loans or on pools of loans sharing common risk characteristics. These expected cash flow estimates are updated for new information on a quarterly basis. Once cash flow estimates are updated, the Company evaluates whether the present value of these cash flows, determined using effective interest rates, have decreased and if so, recognizes provisions for credit losses in its consolidated statement of comprehensive income. For any significant increases in cash flows expected to be collected, the Company adjusts the amount of accretable yield recognized on a prospective basis over the respective loan’s or pool’s remaining life.

Valuation of Goodwill, Intangible Assets and Other Purchase Accounting Adjustments

As previously mentioned, the Company accounts for acquisitions in accordance with ASC Topic No. 805, Business Combinations, which requires the use of the acquisition method of accounting. Under this method, the Company is required to record the assets acquired, including identified intangible assets, and liabilities assumed, at their respective fair values, which in many instances involves estimates based on third party valuations, such as appraisals, or internal valuations based on discounted cash flow analyses or other valuation techniques. The determination of the useful lives of intangible assets is subjective, as is the appropriate amortization method for such intangible assets. In addition, business combinations typically result in recording goodwill.

As discussed in Note 1 to the consolidated financial statements, the Company performs a goodwill evaluation at least annually or whenever events or changes in circumstances indicate that it is more likely than not the fair value of a reporting unit is less than its respective carrying amount. For the annual October 1, 2015 impairment evaluation, management elected to bypass the qualitative assessment for each respective reporting unit (IBERIABANK, IMC, and LTC) and performed Step 1 of the goodwill impairment test. Step 1 of the goodwill impairment test requires the Company to compare the fair value of each reporting unit with its carrying amount, including goodwill. Accordingly, the Company determined the fair value of each reporting unit and compared the fair value to each respective reporting unit’s carrying amount. The Company determined that none of the reporting unit’s fair values were below their respective carrying amounts. The Company concluded goodwill was not impaired as of October 1, 2015. Further, no events or changes in circumstances between October 1, 2015 and December 31, 2015 indicated that it was more likely than not the fair value of any reporting unit had been reduced below its carrying value.

Based on the testing performed in 2015 and 2014, management concluded that for the IBERIABANK, IMC, and LTC reporting units, goodwill was not impaired at any time during those periods.

Goodwill impairment evaluations require management to utilize significant judgments and assumptions including, but not limited to, the general economic environment and banking industry, reporting unit future performance (i.e., forecasts), events or circumstances affecting a respective reporting unit (e.g., interest rate environment), and changes in the Company stock price, amongst other relevant factors. Management’s judgments and assumptions are based on the best information available at the time. Results could vary in subsequent reporting periods if conditions differ substantially from the assumptions utilized in completing the evaluations.

For additional information on goodwill and intangible assets, see Note 1, Summary of Significant Accounting Policies, and Note 10, Goodwill and Other Acquired Intangible Assets, to the consolidated financial statements.

Income Taxes

In the ordinary course of business, we conduct transactions in various taxing jurisdictions (Federal, state, and local) that are subject to complex income tax laws and regulations, which may differ by jurisdiction. The Company is often required to exercise significant judgment regarding the interpretation of these tax laws and regulations, in which the Company’s anticipated and actual payment could significantly vary based upon the taxing authority’s interpretation. Adjustments to current, accrued, or deferred taxes may occur due to modifications in tax rates, newly enacted laws, resolution of items with taxing authorities, alterations to interpretative statutory, judicial, and regulatory guidance that affects the Company’s tax positions, or other facts and circumstances.

RESULTS OF OPERATIONS

9

The Company reported income available to common shareholders of $142.8 million, $105.4 million, and $65.1 million for the years ended December 31, 2015, 2014, and 2013, respectively. EPS on a diluted basis was $3.68 for 2015, $3.30 for 2014, and $2.20 for 2013.

The following discussion provides additional information on the Company’s operating results for the years ended December 31, 2015, 2014, and 2013, segregated by major income statement caption.

Net Interest Income/Net Interest margin

Net interest income is the difference between interest realized on earning assets and interest paid on interest-bearing liabilities and is also the driver of core earnings. As such, it is subject to constant scrutiny by management. The rate of return and relative risk associated with earning assets are weighed to determine the appropriateness and mix of earning assets. Additionally, the need for lower cost funding sources is weighed against relationships with clients and future growth opportunities. The Company’s net interest spread, which is the difference between the yields earned on average earning assets and the rates paid on average interest-bearing liabilities, was 3.41%, 3.40%, and 3.26%, during the years ended December 31, 2015, 2014, and 2013, respectively. The Company’s net interest margin on a taxable equivalent (“TE”) basis, which is net interest income (TE) as a percentage of average earning assets, was 3.55%, 3.51%, and 3.38%, respectively, for the same periods.

10

The following table sets forth information regarding (i) the total dollar amount of interest income from earning assets and the resultant average yields; (ii) the total dollar amount of interest expense on interest-bearing liabilities and the resultant average rates; (iii) net interest income; (iv) net interest spread; and (v) net interest margin. Information is based on average daily balances during the indicated periods. Investment security market value adjustments and trade-date accounting adjustments are not considered to be earning assets and, as such, the net effect of these adjustments is included in non-earning assets.

TABLE 4—AVERAGE BALANCES, NET INTEREST INCOME AND INTEREST YIELDS / RATES

	2015								2014								2013
(Dollars in thousands)	Average Balance			Interest Income/ Expense			Yield/ Rate		Average Balance			Interest Income/ Expense			Yield/ Rate		Average Balance			Interest Income/ Expense			Yield/ Rate
Earning Assets:
Loans(1), (2):
Commercial loans	$	9,292,251		$	411,351		4.42	%	$	7,284,247		$	359,801		4.95	%	$	6,386,364		$	350,451		5.50	%
Mortgage loans	1,165,524			53,948			4.63	%	869,510			44,563			5.13	%	520,872			30,598			5.87	%
Consumer and other loans	2,815,554			141,667			5.03	%	2,310,339			122,342			5.30	%	1,954,766			107,887			5.52	%
Total loans	13,273,329			606,966			4.57	%	10,464,096			526,706			5.04	%	8,862,002			488,936			5.53	%
Loans held for sale	176,793			6,164			3.49	%	130,425			5,153			3.95	%	144,961			5,108			3.52	%
Investment securities	2,595,806			53,165			2.17	%	2,148,963			44,677			2.23	%	2,081,523			38,230			2.01	%
FDIC loss share receivable	52,494			(23,500		)	(44.15	)%	120,567			(74,617		)	(61.04	)%	266,856			(97,849		)	(36.16	)%
Other earning assets	553,629			4,063			0.73	%	371,490			2,896			0.78	%	380,050			2,772			0.73	%
Total earning assets	16,652,051			646,858			3.90	%	13,235,541			504,815			3.85	%	11,735,392			437,197			3.78	%
Allowance for loan losses	(130,808		)						(134,830		)						(184,217		)
Non-earning assets	1,881,463								1,531,283								1,452,813
Total assets	$	18,402,706							$	14,631,994							$	13,003,988
Interest-bearing liabilities
Deposits:
NOW accounts	$	2,620,570		6,903			0.26	%	$	2,240,137		6,006			0.27	%	$	2,337,831		7,557			0.32	%
Savings and money market accounts	6,274,498			21,063			0.34	%	4,616,026			12,802			0.28	%	4,207,343			11,685			0.28	%
Certificates of deposit	2,260,237			19,137			0.85	%	1,889,858			14,282			0.76	%	1,964,702			16,604			0.85	%
Total interest-bearing deposits	11,155,305			47,103			0.42	%	8,746,021			33,090			0.38	%	8,509,876			35,846			0.42	%
Short-term borrowings	426,011			797			0.18	%	782,033			1,364			0.17	%	303,352			490			0.16	%
Long-term debt	388,220			11,200			2.85	%	335,211			10,250			3.02	%	316,775			10,617			3.31	%
Total interest-bearing liabilities	11,969,536			59,100			0.49	%	9,863,265			44,704			0.45	%	9,130,003			46,953			0.51	%
Non-interest-bearing demand deposits	3,996,821								2,916,509								2,216,959
Non-interest-bearing liabilities	175,315								144,861								129,833
Total liabilities	16,141,672								12,924,635								11,476,795
Shareholders’ equity	2,261,034								1,707,359								1,527,193
Total liabilities and shareholders’ equity	$	18,402,706							$	14,631,994							$	13,003,988
Net earning assets	$	4,682,515							$	3,372,276							$	2,605,389
Net interest income/ Net interest spread				$	587,758		3.41	%				$	460,111		3.40	%				$	390,244		3.26	%
Net interest income (TE) / Net interest margin (TE) (3)				$	596,362		3.55	%				$	468,720		3.51	%				$	399,696		3.38	%

(1) Total loans include non-accrual loans for all periods presented.

(2) Interest income includes loan fees of $2.8 million, $2.4 million, and $2.7 million for the years ended December 31, 2015, 2014, and 2013, respectively.

(3) Taxable equivalent yields are calculated using a marginal tax rate of 35%.

Net interest income increased $127.6 million, or 28%, to $587.8 million in 2015 when compared to 2014. The increase in net interest income was the result of a $3.4 billion increase in average earning assets and a five basis point improvement in the earning asset yield when compared to 2014. These improvements were offset by a $2.1 billion, or 21%, increase in average interest-bearing liabilities and a four basis point increase in the average cost of interest-bearing liabilities. The average balance

11

sheet growth over the past twelve months was primarily a result of acquisitions, although the Company has also experienced organic growth in its legacy loan portfolio and deposits.

Average loans made up 80% and 79% of average earning assets in 2015 and 2014, respectively. Average loans increased $2.8 billion, or 27%, from 2014 to 2015 as a result of growth in both the legacy and acquired loan portfolios. Investment securities made up 16% of average earning assets during both 2015 and 2014.

Average interest-bearing deposits made up 93% of average interest-bearing liabilities during 2015, compared to 89% during 2014. Average short-term borrowings made up 4% and 8% of average interest-bearing liabilities in 2015 and 2014, respectively. Average long-term debt made up 3% of average interest-bearing liabilities in both 2015 and 2014.

The five basis point increase in yield on total earning assets when comparing 2015 to 2014 was driven by a decrease in amortization of the Company’s FDIC loss share receivable, which resulted in a negative yield for this asset, partially offset by the mix of lower yielding loans recently acquired. The decrease in amortization on the loss share receivables was the result of the contractual expiration of loss share coverage in late 2014 and early 2015 on certain acquired portfolios covered by loss share agreements with the FDIC.

12

The average mix of earning assets and interest bearing liabilities are shown in the following charts.

13

The following table sets forth information regarding average loan balances and average yields, segregated into the legacy and acquired portfolios, for the periods indicated.

TABLE 5—AVERAGE LOAN BALANCE AND YIELDS

	Years Ended December 31
	2015				2014				2013
(Dollars in thousands)	Average Balance		Average Yield		Average Balance		Average Yield		Average Balance		Average Yield
Legacy loans	$	10,354,265	3.95	%	$	8,860,141	4.00	%	$	7,532,732	4.12	%
Acquired loans	2,919,064		6.84		1,603,955		10.54		1,329,270		13.15
Total loans	13,273,329		4.57		10,464,096		5.04		8,862,002		5.53
FDIC loss share receivables	52,494		(44.15	)	120,567		(61.04	)	266,856		(36.16	)
Total loans and FDIC loss share receivables	$	13,325,823	4.38	%	$	10,584,663	4.29	%	$	9,128,858	4.31	%

14

The following table displays the dollar amount of changes in interest income and interest expense for major components of earning assets and interest-bearing liabilities. The table distinguishes between (i) changes attributable to volume (changes in average volume between periods times the average yield/rate for the two periods), (ii) changes attributable to rate (changes in average rate between periods times the average volume for the two periods), and (iii) total increase (decrease). Changes attributable to both volume and rate are allocated ratably between the volume and rate categories.

TABLE 6—SUMMARY OF CHANGES IN NET INTEREST INCOME

	2015 Compared to 2014							2014 Compared to 2013
	Change Attributable To							Change Attributable To
(Dollars in thousands)	Volume		Rate			Net Increase (Decrease)		Volume			Rate			Net Increase (Decrease)
Earning assets:
Loans:
Commercial loans	$	94,541	$	(42,991	)	$	51,550	$	48,269		$	(38,919	)	$	9,350
Mortgage loans	14,027		(4,642		)	9,385		18,286			(4,321		)	13,965
Consumer and other loans	26,726		(7,401		)	19,325		18,566			(4,111		)	14,455
Loans held for sale	1,670		(659		)	1,011		(540		)	585			45
Investment securities	9,113		(625		)	8,488		773			5,674			6,447
FDIC loss share receivable	34,307		16,810			51,117		70,004			(46,772		)	23,232
Other earning assets	611		556			1,167		767			(643		)	124
Net change in income on earning assets	180,995		(38,952		)	142,043		156,125			(88,507		)	67,618
Interest-bearing liabilities:
Deposits:
NOW accounts	1,004		(107		)	897		(305		)	(1,246		)	(1,551		)
Savings and money market accounts	7,196		1,065			8,261		1,821			(704		)	1,117
Certificates of deposit	3,007		1,848			4,855		(615		)	(1,707		)	(2,322		)
Borrowings	774		(391		)	383		1,523			(1,016		)	507
Net change in expense on interest-bearing liabilities	11,981		2,415			14,396		2,424			(4,673		)	(2,249		)
Change in net interest spread	$	169,014	$	(41,367	)	$	127,647	$	153,701		$	(83,834	)	$	69,867

Interest income includes income earned on interest-earning assets as well as applicable loan fees earned. Interest income that would have been earned on non-accrual loans had they been on accrual status is not included in the tables above.

For the year ended December 31, 2015, earning asset volume, both for acquired earning assets and organic growth, drove the $142.0 million increase in interest income. Average loan balances increased $2.8 billion, or 27%, over 2014 and can be attributed to legacy loan growth, as well as loans acquired from Florida Bank Group, Old Florida, and Georgia Commerce. The declining balance of the FDIC loss share receivable and related amortization also contributed $51.1 million to the increase in interest income.

Interest expense on interest-bearing liabilities increased $14.4 million, or 32%, primarily due to a $14.0 million, or 42%, increase in interest expense on interest-bearing deposits. The increase in interest expense on interest-bearing deposits in 2015 included growth of $2.4 billion in the average balance and a four basis point increase in the rate paid on interest-bearing deposits compared to 2014. Interest expense on the Company’s borrowings increased $0.4 million as a result of an increase in average long-term debt of $53.0 million when compared to 2014.

For the year ended December 31, 2014, earning asset volume, both for acquired earning assets and organic growth, drove the $67.6 million increase in interest income. Average loan balances increased $1.6 billion, or 18%, over 2013 and can be attributed to acquired loan growth from the Trust One, Teche, and First Private acquisitions. In addition to loan volume increases, interest income growth was also a result of a 22 basis point increase in the yield on investment securities due to an increase in average investment securities of $67.4 million, or 3%, between 2013 and 2014. The declining balance of the FDIC loss share receivable and related amortization also contributed $23.2 million to the increase in interest income.

Driven by a decrease of six basis points in the rate paid on interest-bearing liabilities during 2014, interest expense decreased $2.2 million, or 5%, from 2013. Despite an increase of $236.1 million in average interest-bearing deposits (a result of both

15

acquired deposits and organic deposit growth), interest expense on interest-bearing deposits decreased 8%, or $2.8 million, from 2013, as the average rate paid on these deposits decreased to 0.38% for the twelve months of 2014, a four basis point decline. Higher-yielding time deposits across many markets either matured or were repriced during 2014, driving the expense and rate decreases. Interest expense on the Company’s short-term and long-term borrowings, however, increased from 2013, due to a $478.7 million increase in average short-term borrowings and an $18.4 million increase in average long-term debt offset by a 29 basis point decrease in the rate paid on long-term debt.

Provision for Loan Losses

Management of the Company formally assesses the ACL quarterly and will make provisions for loan losses and unfunded lending commitments as necessary in order to maintain the appropriateness of the ACL at the balance sheet date. The provision for loan losses exceeded net charge-offs by $10.8 million for the year ended December 31, 2015. For the year ended December 31, 2014, net charge-offs exceeded the provision for loan losses by $1.4 million.

On a consolidated basis, the Company recorded a provision for loan losses of $30.9 million for the year ended December 31, 2015, an $11.8 million increase from the provision recorded for the same period of 2014. The Company also recorded a provision for unfunded lending commitments of $2.3 million during the current year, included in “credit and other loan-related expense” in the Company’s consolidated statement of comprehensive income. As a result, the Company’s total provision for credit losses was $33.2 million in 2015, which is $13.5 million, or 69%, above the provision recorded in 2014. The Company’s total provision for loan losses in 2015 included a provision for changes in expected cash flows on the acquired loan portfolios of $3.2 million and a $27.7 million provision recorded on legacy loans. The increase in provision was due primarily to legacy loan growth of $1.5 billion, or 16%, from December 31, 2014, as well as higher net loan charge-offs and general energy sector weakness. Net charge-offs to average loans in the legacy portfolio were 0.10% as of December 31, 2015, compared to 0.06% as of December 31, 2014.

On a consolidated basis, the Company recorded a provision for loan losses of $19.1 million for the year ended December 31, 2014, a $13.9 million increase from the provision recorded for the same period of 2013. The Company also recorded a provision for unfunded lending commitments of $0.6 million during 2014. As a result, the Company’s total provision for credit losses was $19.7 million in 2014, $13.3 million above the provision recorded in 2013. The Company’s total provision for loan losses in 2014 included provision for changes in expected cash flows on the acquired loan portfolios of $4.8 million and a $14.3 million provision recorded on legacy loans, based primarily on loan growth. Net charge-offs to average loans in the legacy portfolio were consistent between 2013 and 2014 at 0.06%.

Refer to the "Asset Quality" section of MD&A and Note 6, Allowance for Credit Losses, to the consolidated financial statements for additional details on the provision for loan losses and unfunded commitments.

Non-interest Income

The Company’s operating results for the year ended December 31, 2015 included non-interest income of $220.4 million compared to $173.6 million and $169.0 million for the years ended December 31, 2014 and 2013, respectively. The increase in non-interest income from 2014 to 2015 was primarily a result of an increase in mortgage income and service charges on deposit accounts. Non-interest income as a percentage of total gross revenue (defined as total interest and non-interest income) in 2015 was 25% compared to 26% of total gross revenue in the prior year.

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The following table illustrates the primary components of non-interest income.

TABLE 7—NON-INTEREST INCOME

							2015 vs. 2014				2014 vs. 2013
(Dollars in thousands)	2015		2014		2013		$ Change		% Change		$ Change		% Change
Mortgage income	$	81,122	$	51,797	$	64,197	29,325		57		(12,400	)	(19	)
Service charges on deposit accounts	42,197		35,573		28,871		6,624		19		6,702		23
Title revenue	22,837		20,492		20,526		2,345		11		(34	)	—
Broker commissions	17,592		18,783		16,333		(1,191	)	(6	)	2,450		15
ATM/debit card fee income	13,989		12,023		9,510		1,966		16		2,513		26
Income from bank owned life insurance	4,356		5,473		3,647		(1,117	)	(20	)	1,826		50
Gain on sale of available for sale securities	1,575		771		2,277		804		104		(1,506	)	(66	)
Trust income	6,974		6,019		5,536		955		16		483		9
Credit card income	10,675		9,718		6,298		957		10		3,420		54
Other non-interest income	19,076		12,979		11,763		6,097		47		1,216		10
	$	220,393	$	173,628	$	168,958	46,765		27		4,670		3

In 2015, record levels of mortgage production and strong sales resulted in a $29.3 million increase in mortgage income over 2014. The Company originated $2.5 billion in mortgage loans in 2015, up $789.1 million, or 47%, from 2014. The Company sold $2.5 billion in mortgage loans, up $799.5 million, or 47%, from 2014. Derivative valuation adjustments were $5.3 million higher in 2015 than 2014. In 2014, IMC sales volume slowed compared to 2013, which resulted in a $12.4 million decrease in mortgage income from 2013. Sales proceeds decreased $604.3 million, or 26%, from 2013 to 2014, while derivative valuation adjustments were $6.2 million lower in 2014 than 2013.

Service charges on deposit accounts increased $6.6 million in 2015 over the prior year, and $6.7 million between 2014 and 2013, both due primarily to an increase in deposit accounts as a result of the acquisitions during 2015 and 2014.

Other fluctuations in non-interest income during 2015 included increases from title revenue, ATM/debit card fee income, trust income and credit card income, offset partially by decreases in broker commissions and BOLI income. Other non-interest income increased $6.1 million, or 47%, due to increases in commission income, gains on sales of fixed assets, and other commercial loan income. Other fluctuations in non-interest income from 2013 to 2014 included increases in ATM/debit card fee income, broker commissions, BOLI income and credit card income offset partially by a decrease in the gain on available for sale securities.

Non-interest Expense

The Company’s results for 2015 included non-interest expense of $570.3 million, an increase of $96.7 million over 2014. Ongoing attention to expense control is part of the Company’s corporate culture. However, the Company’s recent investments in acquisitions, product expansion, and operating systems have led to increases in several components of non-interest expense. The Company currently operates 320 combined offices, an increase of 40 offices from December 31, 2014 after adjusting for closed or consolidated branches and offices.

In the current year, the increase in non-interest expenses over 2014 was due to direct merger-related and severance expenses of $26.7 million in 2015 compared to $22.0 million in 2014 as a result of the Company's acquisitions in both years. For the year, the Company’s efficiency ratio was 70.6%, compared to 74.7% in 2014. Excluding non-operating income and expense and the effect of amortization of intangibles, the Company’s tangible operating efficiency ratio (TE) (Non-GAAP) would have been 64.5% in 2015, compared to 68.4% in 2014.

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The following table illustrates the primary components of non-interest expense.

TABLE 8—NON-INTEREST EXPENSE

							2015 vs. 2014				2014 vs. 2013
(Dollars in thousands)	2015		2014		2013		$ Change		% Change		$ Change		% Change
Salaries and employee benefits	$	322,586	$	259,086	$	244,984	63,500		25		14,102		6
Net occupancy and equipment	68,541		59,571		58,037		8,970		15		1,534		3
Communication and delivery	13,506		12,029		12,024		1,477		12		5		—
Marketing and business development	13,176		11,707		10,143		1,469		13		1,564		15
Data processing	34,424		27,249		17,853		7,175		26		9,396		53
Amortization of acquisition intangibles	7,811		5,807		4,720		2,004		35		1,087		23
Professional services	22,368		18,975		18,217		3,393		18		758		4
Costs of OREO property, net	748		2,748		1,943		(2,000	)	(73	)	805		41
Credit and other loan-related expense	16,653		13,692		15,853		2,961		22		(2,161	)	(14	)
Insurance	16,670		14,359		11,272		2,311		16		3,087		27
Travel and entertainment	9,525		9,033		8,126		492		5		907		11
Impairment of FDIC loss share receivables and other long-lived assets	6,954		6,437		37,893		517		8		(31,456	)	(83	)
Other non-interest expense	37,343		32,921		31,731		4,422		13		1,190		4
	$	570,305	$	473,614	$	472,796	96,691		20		818		—

Salaries and employee benefits increased $63.5 million in 2015 when compared to 2014, primarily the result of increased staffing due to the growth of the Company, specifically from the three completed acquisitions during the year. The Company had 3,151 full-time equivalent employees at the end of 2015, an increase of 394, or 14%, from the end of 2014. The Company also had an increase of $8.8 million in commissions and incentives and $6.6 million increase in phantom stock expense for grants in 2015 that contributed to the overall increase in salaries and employee benefits. When comparing 2014 to 2013, the Company had an increase in salaries and employee benefits of $14.1 million, or 6%, related to the completion of three smaller acquisitions in 2014 and cost-savings initiatives. Full-time equivalent employees increased 7% from 2,576 employees at the end of 2013 to 2,757 at the end of 2014.

Net occupancy and equipment expenses were up $9.0 million from 2014, primarily due to additional growth from acquisitions in 2015, as the Company incurred security equipment monitoring costs, and increased rent expense and depreciation from additional branches. From 2013 to 2014, net occupancy and equipment expenses were up $1.5 million, primarily due to merger-related expenses in 2014, as the Company incurred lease termination, signage, and other expenses related to the Company’s three 2014 acquisitions.

Data processing increased $7.2 million in 2015 from 2014 and $9.4 million in 2014 from 2013. The increase is due primarily to increases in merger-related computer services expense of $4.0 million and $6.3 million, respectively, as well as the increased costs of strengthening the Company's cybersecurity.

Due to the continued growth of the Company, professional services expense in 2015 was $3.4 million higher than in 2014. This increase was primarily a result of merger-related legal expenses, increased consulting services for process improvements, and exam and supervisory review. Professional services expense in 2014 was $0.8 million higher than in 2013. In 2014, the Company incurred $3.4 million in merger-related expenses, including legal and audit fees, offset by a $2.2 million decrease in consulting expenses that were incurred in 2013 to improve various Company and business-line specific processes.

Expense related to the impairment of FDIC loss share receivables and other long-lived assets increased $0.5 million in 2015 as compared to 2014. The $7.0 million expense recognized in 2015 was primarily the result of write-downs related to branch closure and consolidation efforts. The year ended December 31, 2014 included an impairment charge of $5.1 million on FDIC loss share receivables. In 2013, an impairment charge of $31.8 million was recognized on FDIC loss share receivables.

The $4.4 million, or 13%, increase in other non-interest expense in 2015 was primarily due to increases in ATM/debit card expense (due to a higher volume of ATM/debit card transactions and higher interchange and issuance expenses) and deposit insurance expense (due to deposit growth year over year). Other non-interest expense in 2014 included increases in almost all other categories when compared to 2013, which was consistent with growth in the Company’s customer base and footprint.

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Income Taxes

For the years ended December 31, 2015, 2014, and 2013, the Company recorded income tax expense of $64.1 million, $35.7 million, and $16.1 million, respectively, which resulted in an effective income tax rate of 31.0% in 2015, 25.3% in 2014, and 19.9% in 2013.

The difference between the effective tax rate and the statutory federal and state tax rates relates to items that are non-taxable or non-deductible, primarily the effect of tax-exempt income and various tax credits. The effective tax rates in 2014 and 2015 have increased primarily due to the increase in pre-tax income without a corresponding proportional increase in tax credits. In addition, the 2015 effective tax rate was negatively impacted by the post-merger effect of the 2015 acquisitions, which contributed to the increase in the Company's state effective tax rate given the higher statutory tax rates in Florida and Georgia.

FINANCIAL CONDITION

EARNING ASSETS

Interest income associated with earning assets is the Company’s primary source of income. Earning assets are composed of interest-earning or dividend-earning assets, including loans, securities, short-term investments, and loans held for sale. As a result of both acquired assets and organic growth, earning assets increased $3.5 billion, or 24%, during 2015. Earning assets averaged $16.7 billion during 2015, a $3.4 billion, or 26%, increase when compared to 2014. Major components of earning assets at December 31 are shown in the following table:

TABLE 9—EARNING ASSETS COMPOSITION

(Ending Balances)

(Dollars in thousands)	2015		2014		Increase (Decrease)
Legacy Loans
Commercial Loans	$	8,133,341	$	7,002,198	$	1,131,143		16	%
Mortgage Loans	694,023		527,694		166,329			32
Consumer Loans	2,363,156		2,138,822		224,334			10
Total Legacy Loans	11,190,520		9,668,714		1,521,806			16
Acquired Loans	3,136,908		1,772,330		1,364,578			77
Total Loans, Net of Unearned Income	14,327,428		11,441,044		2,886,384			25
FDIC Loss Share Receivables	39,878		69,627		(29,749		)	(43	)
Total Loans and FDIC Loss Share Receivables	14,367,306		11,510,671		2,856,635			25
Investment Securities	2,899,214		2,275,813		623,401			27
Other Earning Assets	506,532		515,715		(9,183		)	(2	)
Total Earning Assets	$	17,773,052	$	14,302,199	$	3,470,853		24	%

19

The year-end mix of earning assets is shown in the following charts.

20

The following discussion highlights the Company’s major categories of earning assets.

Investment Securities

Investment securities increased by $623.4 million, or 27%, to $2.9 billion over the past year due to both acquired investment securities and open-market security purchases. Investment securities increased to 15% of total assets at December 31, 2015 from 14% at December 31, 2014. Investment securities were 16% of average earning assets for both 2015 and 2014. The following table shows the carrying values of securities by category as of December 31 for the years indicated.

TABLE 10—CARRYING VALUE OF SECURITIES

(Dollars in thousands)	2015				2014				2013				2012				2011
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	252,083	9	%	$	315,553	14	%	$	395,561	19	%	$	285,724	15	%	$	342,488	17	%
Obligations of states and political subdivisions	187,961		7		90,190		4		107,479		5		127,075		7		143,805		7
Mortgage-backed securities	2,264,813		78		1,751,615		77		1,432,278		68		1,330,656		68		1,317,374		66
Other securities	95,429		3		1,495		—		1,479		—		1,549		—		1,538		—
	2,800,286		97		2,158,853		95		1,936,797		92		1,745,004		90		1,805,205		90
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	—		—		10,000		—		34,478		2		69,949		4		85,172		4
Obligations of states and political subdivisions	69,979		2		77,597		4		84,290		4		88,909		4		81,053		4
Mortgage-backed securities	28,949		1		29,363		1		35,341		2		46,204		2		26,539		2
	98,928		3		116,960		5		154,109		8		205,062		10		192,764		10
	$	2,899,214	100	%	$	2,275,813	100	%	$	2,090,906	100	%	$	1,950,066	100	%	$	1,997,969	100	%

At December 31, 2015, all of the Company's mortgage-backed securities were issued by government-sponsored enterprises. The Company does not hold any Fannie Mae or Freddie Mac preferred stock, corporate equity, collateralized debt obligations, collateralized loan obligations, or structured investment vehicles, nor does it hold any private label collateralized mortgage obligations, subprime, Alt-A, sovereign debt, or second lien elements in its investment portfolio.

The following table summarizes activity in the Company’s investment securities portfolio during 2015 and 2014. There were no transfers of securities between investment categories during 2015.

TABLE 11—INVESTMENT PORTFOLIO ACTIVITY

(Dollars in thousands)	Available for Sale						Held to Maturity
	2015			2014			2015			2014
Balance at beginning of period	$	2,158,853		$	1,936,797		$	116,960		$	154,109
Purchases	1,063,460			703,179			5,833			—
Acquisitions	309,485			44,386			—			—
Sales, net of gains	(227,029		)	(60,931		)	—			—
Principal maturities, prepayments and calls, net of gains	(473,142		)	(488,699		)	(22,939		)	(36,180		)
Amortization of premiums and accretion of discounts	(17,268		)	(12,827		)	(926		)	(969		)
Unrealized gains (losses)	(14,073		)	36,948			—			—
Balance at end of period	$	2,800,286		$	2,158,853		$	98,928		$	116,960

Funds generated as a result of sales and prepayments of investment securities are used to fund loan growth and purchase other securities. The Company continues to monitor market conditions and take advantage of market opportunities with appropriate risk and return elements.

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The Company assesses the nature of the unrealized losses in its investment portfolio at least quarterly to determine if there are losses that are deemed other-than-temporary. In its analysis of these securities, management considers numerous factors to determine whether there are instances where the amortized cost basis of the debt securities would not be fully recoverable including, the length of time and extent to which the fair value of the securities was less than their amortized cost, whether adverse conditions were present in the operations, geographic area or industry of the issuer, the payment structure of the security, including scheduled interest and principal payments, changes to the rating of the security by a rating agency, and subsequent recoveries or additional declines in fair value after the balance sheet date.

Management believes it has considered these factors, as well as all relevant information available, when determining the expected future cash flows of the securities in question. Based on its analysis, the Company concluded no declines in the market value of the Company’s investment securities were deemed to be other-than-temporary at December 31, 2015 and 2014. Note 4 to the consolidated financial statements provides further information on the Company’s investment securities.

Loans

The Company’s total loan portfolio increased $2.9 billion, or 25%, to $14.3 billion at December 31, 2015, which was driven by legacy loan growth of $1.5 billion and a $1.4 billion net increase in acquired loans. By loan type, the increase was primarily from commercial loan growth of $2.4 billion and consumer loan growth of $386.6 million during 2015, 31% and 15% higher, respectively, than at the end of 2014.

The major categories of loans outstanding at December 31, 2015 and 2014 are presented in the following tables, segregated into legacy and acquired loans.

TABLE 12—SUMMARY OF LOANS

	December 31, 2015
(Dollars in thousands)	Commercial						Residential Mortgage				Consumer and Other
	Real Estate		Commercial and Industrial		Energy-related		1 - 4 Family		Construction		Indirect automobile		Home Equity		Credit Card		Other		Total
Legacy	$	4,504,062	$	2,952,102	$	677,177	$	610,986	$	83,037	$	246,214	$	1,575,643	$	77,261	$	464,038	$	11,190,520
Acquired	1,569,449		492,476		3,589		501,296		—		84		490,524		582		78,908		3,136,908
Total loans	$	6,073,511	$	3,444,578	$	680,766	$	1,112,282	$	83,037	$	246,298	$	2,066,167	$	77,843	$	542,946	$	14,327,428
	December 31, 2014
	Commercial						Residential Mortgage				Consumer and Other
	Real Estate		Commercial and Industrial		Energy-related		1 - 4 Family		Construction		Indirect automobile		Home Equity		Credit Card		Other		Total
Legacy	$	3,676,811	$	2,452,521	$	872,866	$	495,638	$	32,056	$	396,766	$	1,290,976	$	72,745	$	378,335	$	9,668,714
Acquired	684,968		119,174		7,742		552,603		—		392		310,129		648		96,674		1,772,330
Total Loans	$	4,361,779	$	2,571,695	$	880,608	$	1,048,241	$	32,056	$	397,158	$	1,601,105	$	73,393	$	475,009	$	11,441,044

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Loan Portfolio Components

The Company believes its loan portfolio is diversified by product and geography throughout its footprint. The year-end loan portfolio is segregated into various components and markets in the following charts.

23

From a market perspective, total loan growth (excluding acquired loans) was seen primarily in the Houston, southeast Florida, Dallas, and Birmingham markets. Loans in the Houston market increased $198.5 million, or 16%, during 2015, while loans in the southeast Florida market increased $129.8 million, or 73%. Dallas had year-to-date loan growth of $114.8 million, or 35%, and Birmingham experienced growth of $92.8 million, or 14%, since the end of 2014.

The loan portfolio by market for the years ending December 31, 2015 and 2014 are shown in the following charts.

24

The Company’s loan to deposit ratio at December 31, 2015 and 2014 was 89% and 91%, respectively. The percentage of fixed- rate loans to total loans decreased from 49% at the end of 2014 to 48% at December 31, 2015. The table below sets forth the composition of the loan portfolio at December 31, followed by a discussion of activity by major loan type.

TABLE 13—TOTAL LOANS BY LOAN TYPE

(Dollars in thousands)	2015				2014				2013				2012				2011
Commercial loans:
Real estate	$	6,073,511	42	%	$	4,361,779	38	%	$	3,786,501	40	%	$	3,578,363	42	%	$	3,290,294	44	%
Commercial and industrial	3,444,578		24		2,571,695		23		2,324,235		24		2,015,081		24		1,669,601		23
Energy-related	680,766		5		880,608		8		752,682		8		575,817		7		409,230		6
Total commercial loans	10,198,855		71		7,814,082		69		6,863,418		72		6,169,261		73		5,369,125		73
Residential mortgage loans:
Residential 1-4 family	1,112,282		8		1,048,241		9		577,082		6		471,183		5		522,357		7
Construction/owner-occupied	83,037		—		32,056		—		9,450		—		6,021		—		16,143		—
Total residential mortgage loans	1,195,319		8		1,080,297		9		586,532		6		477,204		5		538,500		7
Consumer and other loans:
Home equity	2,066,167		15		1,601,105		14		1,291,792		14		1,251,125		15		1,019,110		14
Indirect automobile	246,298		2		397,158		3		375,236		4		327,985		4		261,896		3
Other	620,789		4		548,402		5		375,041		4		273,005		3		199,406		3
Total consumer and other loans	2,933,254		21		2,546,665		22		2,042,069		22		1,852,115		22		1,480,412		20
Total loans	$	14,327,428	100	%	$	11,441,044	100	%	$	9,492,019	100	%	$	8,498,580	100	%	$	7,388,037	100	%

Commercial Loans

Total commercial loans increased $2.4 billion, or 31%, from December 31, 2014, with $1.1 billion, or 16%, in legacy loan growth and an increase in acquired commercial loans of $1.3 billion, or 154%. The Company continued to attract and retain commercial customers in 2015 as commercial loans were 71% of the total loan portfolio at December 31, 2015, compared to 69% at December 31, 2014. Unfunded commitments on commercial loans were $3.6 billion at December 31, 2015, an increaseof $269.7 million, or 8%, when compared to the end of the prior year.

Commercial real estate loans include loans to commercial customers for long-term financing of land and buildings or for land development or construction of a building. These loans are repaid from revenues repaid through operations of the businesses, rents of properties, sales of properties and refinances. Commercial real estate loans increased $1.7 billion, or 39%, during the year, consisting of increases in legacy commercial real estate loans of $827.3 million, or 23%, and acquired commercial real estate loans of $884.5 million, or 129%. At December 31, 2015, commercial real estate loans totaled $6.1 billion, or 42% of the total loan portfolio, compared to 38% at December 31, 2014. The Company’s underwriting standards generally provide for loan terms of three to five years, with amortization schedules of generally no more than twenty years. Low loan-to-value ratios are generally maintained and usually limited to no more than 80% at the time of origination.

Commercial and industrial loans represent loans to commercial customers to finance general working capital needs, equipment purchases and other projects where repayment is derived from cash flows resulting from business operations. The Company originates commercial business loans on a secured and, to a lesser extent, unsecured basis. The Company’s commercial business loans may be term loans or revolving lines of credit. Term loans are generally structured with terms of no more than three to five years, with amortization schedules of generally no more than seven years. Commercial business term loans are generally secured by equipment, machinery or other corporate assets. The Company also provides for revolving lines of credit generally structured as advances upon perfected security interests in accounts receivable and inventory. Revolving lines of credit generally have annual maturities. The Company obtains personal guarantees of the principals as additional security for most commercial business loans. As of December 31, 2015, commercial loans not secured by real estate totaled $4.1 billion, or 29% of the total loan portfolio. This represents a $673.0 million, or 19%, increase from December 31, 2014.

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The following table details the Company’s commercial loans by state.

TABLE 14—COMMERCIAL LOANS BY STATE

(Dollars in thousands)	Louisiana		Florida		Alabama		Texas		Arkansas		Georgia		Tennessee		Other		Total
December 31, 2015
Legacy	$	3,081,494	$	947,812	$	1,059,604	$	1,812,055	$	569,384	$	125,493	$	486,703	$	50,796	$	8,133,341
Acquired	271,780		1,079,000		28,145		40,854		—		568,283		20,419		57,033		2,065,514
Total	$	3,353,274	$	2,026,812	$	1,087,749	$	1,852,909	$	569,384	$	693,776	$	507,122	$	107,829	$	10,198,855
December 31, 2014
Legacy	$	3,015,447	$	342,246	$	901,705	$	1,633,162	$	676,691	$	—	$	423,621	$	9,326	$	7,002,198
Acquired	351,148		348,968		33,845		52,438		—		—		25,485		—		811,884
Total	$	3,366,595	$	691,214	$	935,550	$	1,685,600	$	676,691	$	—	$	449,106	$	9,326	$	7,814,082

Energy-related Loans

The Company’s loan portfolio included energy-related loans of $680.8 million at December 31, 2015, or 4.8% of total loans, compared to $880.6 million at December 31, 2014, a decrease of $199.8 million, or 23%. At December 31, 2015, exploration and production (“E&P”) loans accounted for 46% of energy-related loans and 56% of energy-related commitments. Midstream companies accounted for 17% of energy-related loans and 16% of energy loan commitments, while service company loans totaled 37% of energy-related loans and 28% of energy commitments.

The rapid and sustained decline in energy commodity prices has unsettled the financial condition of businesses and communities tied to the oil and gas industries. While the vast majority of the Company's loan portolio continues to have no exposure to these concerns, we remain vigilant in our actions to mitigate the risks in the current environment.

Generally, service companies are the most affected by fluctuations in commodity prices, while midstream companies are the least affected. Based on the composition of its portfolio at December 31, 2015, the Company believes most of its exposure is in areas of lower credit risk. The Company's historical focus on sound client selection, conservative credit underwriting, and proactive portfolio management, and market and business diversification continue to serve the Company well. The strategic

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decision to expand into larger markets across the southeast allows the Company to drive growth and profitability to offset declining positions in impacted energy segments of business.

Mortgage Loans

Residential mortgage loans consist of loans to consumers to finance a primary residence. The vast majority of the residential mortgage loan portfolio is comprised of non-conforming 1-4 family mortgage loans secured by properties located in the Company's market areas and originated under terms and documentation that permit their sale in the secondary market. Larger mortgage loans of current and prospective private banking clients are generally retained to enhance relationships, but also tend to be more profitable due to the expected shorter durations and relatively lower servicing costs associated with loans of this size. The Company does not originate or hold high loan-to-value, negative amortization, option ARM, or other exotic mortgage loans in its portfolio. In the third quarter of 2012, the Company began to invest in loans that would be considered sub-prime (e.g., loans with a FICO score of less than 620) in order to facilitate compliance with relevant Community Reinvestment Act regulations. The Company expects to continue to invest in these types of CRA compliant subprime loans through additional secondary market purchases, as well as direct originations in 2016, albeit up to a limited amount. The Company did not make a significant investment in subprime loans in 2015.

The Company continues to sell the majority of conforming mortgage loan originations in the secondary market rather than assume the interest rate risk associated with these longer term assets. Upon the sale, the Company retains servicing on a limited portion of these loans. Total residential mortgage loans increased $115.0 million, or 11%, compared to December 31, 2014, the result of private banking originations and acquired mortgage loans. Offsetting these purchases and originations were net decreases in the Company’s acquired mortgage loan portfolio of $51.3 million as existing loans were paid down.

Consumer and Other Loans

The Company offers consumer loans in order to provide a full range of retail financial services to its customers. The Company originates substantially all of its consumer loans in its primary market areas. At December 31, 2015, $2.9 billion, or 21%, of the total loan portfolio was comprised of consumer loans, compared to $2.5 billion, or 22%, at the end of 2014. Total consumer loans at December 31, 2015, increased $386.6 million from December 31, 2014, of which $224.3 million, or 58%, was a result of legacy consumer loan growth. Home equity loans and lines of credit made up a majority of the total consumer loan growth offset by a decrease in indirect automobile loans.

Consistent with 2014, home equity loans comprised the largest component of the consumer loan portfolio at December 31, 2015. Home equity lending allows customers to borrow against the equity in their home and is secured by a first or second mortgage on the borrower’s residence. Real estate market values at the time the loan is secured affect the amount of credit extended. Changes in these values may impact the extent of potential losses. The balance of home equity loans increased $465.1 million during the year to $2.1 billion at December 31, 2015. The Company’s sales and marketing efforts in 2015 have also contributed to the growth in legacy home equity loans since December 31, 2014. Unfunded commitments related to home equity loans and lines were $730.9 million at December 31, 2015, an increase of $162.9 million versus the prior year. The Company has approximately $771.6 million of loans with junior liens where the Company does not hold or service the respective loan holding senior lien. The Company believes it has addressed the risks associated with these loans in its allowance for credit losses.

In January 2015, the Company announced it would exit the indirect automobile lending business. The Company concluded compliance risk associated with these loans had become unbalanced relative to potential returns generated by the business on a risk-adjusted basis. At December 31, 2015, indirect automobile loans totaled $246.3 million or 1.7% of the total loan portfolio, compared to $397.2 million, or 3.5% of the total loan portfolio at December 31, 2014.

The remainder of the consumer loan portfolio at December 31, 2015 consisted of credit card loans, direct automobile loans and other personal loans, and comprised 4.3% of the total loan portfolio.

Overall, the composition of the Company's loan portfolio as of December 31, 2015 is consistent with the composition as of December 31, 2014.

In order to assess the risk characteristics of the loan portfolio, the Company considers the current U.S. economic environment and that of its primary market areas. See Note 6, Allowance for Credit Losses, to the notes to the consolidated financial statements for credit quality factors by loan portfolio segment.

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Additional information on the Company’s consumer loan portfolio is presented in the following tables. For the purposes of Table 16, unscoreable consumer loans have been included with loans with FICO scores below 660. FICO scores reflect the most recent information available as of the dates indicated.

TABLE 15—CONSUMER LOANS BY STATE

(Dollars in thousands)	Louisiana		Florida		Alabama		Texas		Arkansas		Georgia		Tennessee		Other		Total
December 31, 2015
Legacy	$	1,023,828	$	286,539	$	246,837	$	113,773	$	252,289	$	32,562	$	51,182	$	356,146	$	2,363,156
Acquired	155,980		233,886		36,977		42,420		—		86,083		14,742		10		570,098
Total consumer loans	$	1,179,808	$	520,425	$	283,814	$	156,193	$	252,289	$	118,645	$	65,924	$	356,156	$	2,933,254
December 31, 2014
Legacy	$	924,255	$	146,979	$	229,290	$	84,087	$	224,605	$	—	$	33,214	$	496,392	$	2,138,822
Acquired	186,147		121,579		6,056		75,473		—		—		18,289		299		407,843
Total consumer loans	$	1,110,402	$	268,558	$	235,346	$	159,560	$	224,605	$	—	$	51,503	$	496,691	$	2,546,665

TABLE 16—CONSUMER LOANS BY FICO SCORE

(Dollars in thousands)	Below 660		660-720		Above 720		Discount			Total
December 31, 2015
Legacy	$	427,938	$	604,751	$	1,330,467	$	—		$	2,363,156
Acquired	122,619		144,665		334,023		(31,209		)	570,098
Total consumer loans	$	550,557	$	749,416	$	1,664,490	$	(31,209	)	$	2,933,254
December 31, 2014
Legacy	$	405,243	$	538,361	$	1,195,218	$	—		$	2,138,822
Acquired	98,762		94,168		248,478		(33,565		)	407,843
Total consumer loans	$	504,005	$	632,529	$	1,443,696	$	(33,565	)	$	2,546,665

Loan Maturities

The following table sets forth the scheduled contractual maturities of the Company’s total loan portfolio at December 31, 2015, unadjusted for scheduled principal reductions, prepayments or repricing opportunities. Demand loans, loans having no stated schedule of repayments and no stated maturity, and overdraft loans are reported as due in one year or less. The average life of a loan may be substantially less than the contractual terms because of prepayments. As a result, scheduled contractual amortization of loans is not reflective of the expected term of the Company’s loan portfolio. Of the loans with maturities greater than one year, approximately 80% of the balance of these loans bears a fixed rate of interest.

TABLE 17—LOAN MATURITIES BY LOAN TYPE

(Dollars in thousands)	One Year or Less		One Through Five Years		After Five Years		Discount			Total
Commercial real estate	$	2,708,383	$	2,288,789	$	1,129,527	$	(53,188	)	$	6,073,511
Commercial and industrial	2,133,646		833,406		484,426		(6,900		)	3,444,578
Energy-related	113,125		559,493		8,148		—			680,766
Mortgage - Residential 1-4 family	205,345		197,187		739,309		(29,559		)	1,112,282
Mortgage - Construction	6,352		17,200		59,485		—			83,037
Consumer and other	1,653,395		559,620		751,448		(31,209		)	2,933,254
Total	$	6,820,246	$	4,455,695	$	3,172,343	$	(120,856	)	$	14,327,428

Mortgage Loans Held for Sale

Loans held for sale increased $26.2 million, or 19%, to $166.2 million at December 31, 2015 compared to year-end 2014. In 2015, the Company originated $2.5 billion in mortgage loans compared to $1.7 billion of originations during 2014.

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Loans held for sale have primarily been conforming fixed-rate single-family residential mortgage loans under contracts to be sold in the secondary market. In most cases, loans in this category are sold within thirty days of closing. Buyers generally have recourse to return a purchased loan to the Company under limited circumstances. See Note 1 to the consolidated financial statements for further discussion.

Asset Quality

The Company’s transition over time to a commercial bank brings the potential for increased risks in the form of potentially higher levels of charge-offs and non-performing assets, as well as increased rewards in the form of potentially increased levels of shareholder returns. As a result of management’s enhancements to underwriting loan risk/return dynamics, the credit quality of the loan portfolio has remained favorable when compared to peers. Management believes that it has demonstrated proficiency in managing credit risk through timely identification of significant problem loans, prompt corrective action, and transparent disclosure. Consistent with prior years, the assets and liabilities purchased and assumed through the Company’s six failed bank acquisitions continue to have a disproportionate impact, as expected, on overall asset quality. The Company continues to closely monitor the risk-adjusted level of return within the loan portfolio.

Written underwriting standards established by management and approved by the Board of Directors govern the lending activities of the Company. The commercial credit department, in conjunction with senior lending personnel, underwrites all commercial business and commercial real estate loans. The Company provides centralized underwriting of substantially all residential mortgage, construction and consumer loans. Established loan origination procedures require appropriate documentation, including financial data and credit reports. For loans secured by real property, the Company generally requires property appraisals, title insurance or a title opinion, hazard insurance, and flood insurance, where appropriate.

Loan payment performance is monitored and late charges are generally assessed on past due accounts. A centralized department administers delinquent loans. Every effort is made to minimize any potential loss, including instituting legal proceedings as necessary. Commercial loans are periodically reviewed through a loan review process to provide an independent assessment of a loan’s risks. All other loans are also subject to loan reviews through a periodic sampling process. The Company exercises significant judgment in determining the risk classification of its commercial loans.

The Company utilizes an asset risk classification system in accordance with guidelines established by the FRB as part of its efforts to monitor commercial asset quality. In connection with their examinations of insured institutions, both federal and state examiners also have the authority to identify problem assets and, if appropriate, reclassify them. There are three classifications for problem assets: “substandard,” “doubtful” and “loss”, all of which are considered adverse classifications. Substandard assets have one or more defined weaknesses and are characterized by the distinct possibility that the Company will sustain some loss if the weaknesses are not corrected. Doubtful assets have the weaknesses of substandard assets with the additional characteristic that the weaknesses make collection or liquidation in full questionable, and there is a high probability of loss based on currently existing facts, conditions and values. An asset classified as loss is considered not collectible and of such little value that continuance as an asset of the Company is not warranted. Commercial loans with adverse classifications are reviewed by the Board Risk Committee of the Board of Directors periodically. Loans are placed on non-accrual status when they are 90 days or more past due unless, in the judgment of management, the probability of timely collection of principal and interest is deemed to be sufficient to warrant further accrual. When a loan is placed on non-accrual status, the accrual of interest income ceases and accrued but unpaid interest attributable to the current year is reversed against interest income. Accrued interest receivable attributable to the prior year is recorded as a charge-off to the allowance for credit losses.

Real estate acquired by the Company through foreclosure or by deed-in-lieu of foreclosure is classified as OREO, and is recorded at the lesser of the related loan balance (the pro-rata carrying value for acquired loans) or estimated fair value less costs to sell. Closed bank branches are also classified as OREO and recorded at the lower of cost or market value.

Under GAAP, certain loan modifications or restructurings are designated as TDRs. In general, the modification or restructuring of a debt constitutes a TDR if the Company, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider under current market conditions.

Non-performing Assets

The Company defines non-performing assets as non-accrual loans, accruing loans more than 90 days past due, OREO, and foreclosed property. Management continually monitors loans and transfers loans to non-accrual status when warranted.

Covered loans represent loans acquired through failed bank acquisitions and continue to be covered by loss sharing agreements with the FDIC, whereby the FDIC reimburses the Company for the majority of the losses incurred during the loss share claim period. In addition to covered loans, the Company also accounts for loans formerly covered by loss sharing agreements with the FDIC, other loans acquired with deteriorated credit quality, as well as all loans acquired with significant discounts that did not

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exhibit deteriorated credit quality at acquisition, in accordance with ASC Topic 310-30. Collectively, all loans accounted for under ASC 310-30 are referred to as "purchased impaired loans". Application of ASC Topic 310-30 results in significant accounting differences, compared to loans originated or acquired by the Company that are not accounted for under ASC 310-30. See Note 1, Summary of Significant Accounting Policies, to the Notes to the consolidated financial statements for further details. Purchased impaired loans were considered to be performing as of the acquisition date regardless of their past due status based on their contractual terms. However, in accordance with regulatory reporting guidelines, purchased impaired loans that are contractually past due are reported as past due and accruing based on the number of days past due.

Due to the significant difference in accounting for covered loans and the related FDIC loss sharing agreements, as well as non-covered acquired loans accounted for as purchased impaired loans, and given the significant amount of acquired impaired loans that are past due but still accruing, the Company believes inclusion of these loans in certain asset quality ratios that reflect non-performing assets in the numerator or denominator (or both) results in significant distortion to these ratios. In addition, because loan level charge-offs related to purchased impaired loans are not recognized in the financial statements until the cumulative amounts exceed the original loss projections on a pool basis, the net charge-off ratio for acquired loans is not consistent with the net charge-off ratio for other loan portfolios. The inclusion of these loans in certain asset quality ratios could result in a lack of comparability across quarters or years, and could impact comparability with other portfolios that were not impacted by purchased impaired loan accounting. The Company believes that the presentation of certain asset quality measures excluding either covered loans or all purchased impaired loans, as indicated below, and related amounts from both the numerator and denominator provides better perspective into underlying trends related to the quality of its loan portfolio. Accordingly, the asset quality measures in the tables below present asset quality information excluding either covered loans or all purchased impaired loans, as indicated within each table, and related amounts.

Legacy non-performing assets increased $11.1 million, or 19%, compared to December 31, 2014, as non-accrual loans increased $16.0 million, offset by decreases in OREO of $4.8 million and accruing loans 90 days or more past due of $130,000. Including TDRs that are in compliance with their modified terms, total non-performing assets and TDRs increased $48.1 million over the past twelve months.

The following table sets forth the composition of the Company’s legacy non-performing assets, including accruing loans past due 90 or more days and TDRs, as of December 31.

TABLE 18—NON-PERFORMING ASSETS AND TROUBLED DEBT RESTRUCTURINGS

(LEGACY)

																2015 vs. 2014
(Dollars in thousands)	2015			2014			2013			2012			2011			$ Change		% Change
Non-accrual loans:
Commercial	$	22,201		$	9,953		$	24,471		$	32,313		$	42,655		12,248		123
Energy-related	7,081			27			—			—			—			7,054		N/M
Mortgage	13,674			14,362			10,237			8,367			4,910			(688	)	(5	)
Consumer and credit card	7,972			10,628			8,979			7,237			6,889			(2,656	)	(25	)
Total non-accrual loans	50,928			34,970			43,687			47,917			54,454			15,958		46
Accruing loans 90 days or more past due	624			754			1,075			1,371			1,841			(130	)	(17	)
Total non-performing loans (1)	51,552			35,724			44,762			49,288			56,295			15,828		44
OREO and foreclosed property (2)	16,491			21,243			28,272			26,380			21,382			(4,752	)	(22	)
Total non-performing assets (1)	68,043			56,967			73,034			75,668			77,677			11,076		19
Performing troubled debt restructurings (3)	38,441			1,430			1,376			2,354			55			37,011		N/M
Total non-performing assets and troubled debt restructurings (1)	$	106,484		$	58,397		$	74,410		$	78,022		$	77,732		48,087		82
Non-performing loans to total loans (1) (4)	0.46		%	0.37		%	0.54		%	0.73		%	1.05		%
Non-performing assets to total assets (1) (4)	0.42		%	0.41		%	0.61		%	0.69		%	0.86		%
Non-performing assets and troubled debt restructurings to total assets (1)(4)	0.65		%	0.42		%	0.62		%	0.71		%	0.86		%
Allowance for credit losses to non-performing loans (4) (5)	209.41		%	246.26		%	175.35		%	150.57		%	132.98		%
Allowance for credit losses to total loans (4) (5)	0.96		%	0.91		%	0.95		%	1.10		%	1.40		%

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(1) Non-performing loans and assets include accruing loans 90 days or more past due.

(2) OREO and foreclosed property at December 31, 2015, 2014, 2013, 2012, and 2011 include $8.1 million, $11.6 million, $9.2 million, $9.2 million, and $5.7 million, respectively, of former bank properties held for development or resale.

(3) Performing troubled debt restructurings for December 31, 2015, 2014, 2013, 2012 and 2011 exclude $23.4 million, $2.2 million, $18.5 million, $15.4 million, $23.9 million, respectively, in troubled debt restructurings that meet non-performing asset criteria.

(4) Total loans, total non-performing loans, and total assets exclude acquired loans and assets discussed below.

(5) The allowance for credit losses excludes the portion of the allowance related to acquired loans discussed below.

Non-performing legacy loans were 0.46% of total legacy loans at December 31, 2015, nine basis points higher than at December 31, 2014. The increase in legacy non-performing loans was due primarily to two legacy relationships totaling $21.5 million that moved to non-accrual status during 2015. If acquired loans that meet non-performing criteria are included, non-performing loans were 1.09% of total loans at December 31, 2015 and 1.50% at December 31, 2014. The allowance for loan losses as a percentage of total loans, including acquired loans, was 0.97% at December 31, 2015 and 1.14% at December 31, 2014.

Non-performing assets as a percentage of total assets have remained at relatively low levels. Legacy non-performing assets were 0.42% of total legacy assets at December 31, 2015, one basis point above December 31, 2014. The allowance for credit losses as a percentage of non-performing legacy loans was 209.41% at December 31, 2015 and 246.26% at December 31, 2014. The Company’s reserve for credit losses as a percentage of legacy loans increased five basis points from 2014 to 0.96% at December 31, 2015.

The Company had gross charge-offs on legacy loans of $15.8 million during the year ended December 31, 2015. Offsetting these charge-offs were recoveries of $5.7 million. As a result, net charge-offs on legacy loans during 2015 were $10.1 million,or 0.10% of average loans, as compared to net charge-offs of $5.4 million, or 0.06%, for 2014.

At December 31, 2015, excluding acquired loans, the Company had $132.6 million of legacy assets classified as substandard, $11.5 million of assets classified as doubtful, and no assets classified as loss. Accordingly, the aggregate of the Company’s legacy classified assets was 0.74% of total assets, 1.01% of total loans, and 1.29% of legacy loans. At December 31, 2014, classified assets totaled $53.3 million, or 0.34% of total assets, 0.47% of total loans, and 0.55% of legacy loans. As with non-classified assets, a reserve for credit losses has been recorded for substandard loans at December 31, 2015 in accordance with the Company’s allowance for credit losses policy.

In addition to the problem loans described above, there were $104.8 million of legacy loans classified as special mention at December 31, 2015, which in management’s opinion were subject to potential future rating downgrades. Special mention loans are defined as loans where known information about possible credit problems of the borrowers causes management to have some doubt as to the ability of these borrowers to comply with the present loan repayment terms, which may result in future disclosure of these loans as non-performing. Special mention loans at December 31, 2015 increased $47.4 million, or 83%, from December 31, 2014. The increase was attributable to both loan growth and a movement of loans from substandard to special mention.

As noted above, the asset quality of the Company’s energy-related loan portfolio may be impacted by a sustained decline in commodity prices. At December 31, 2015, however, only $15,000 in energy-related loans were past due greater than 30 days. Non-accrual energy-related loans total $7.1 million of legacy loans and $1.4 million of acquired loans at year-end 2015, compared to $27,000 and $11,000, respectively, at year-end 2014. To date, the Company has experienced no energy-related charge-offs.

Past Due Loans

Past due status is based on the contractual terms of loans. At December 31, 2015, total acquired loans past due were 3.84% of total loans, a decrease of 503 basis points from December 31, 2014. Total legacy past due loans (including non-accrual loans) were 0.65% of total loans at December 31, 2015 compared to 0.67% at December 31, 2014. Additional information on past due loans is presented in the following table.

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TABLE 19—PAST DUE LOAN SEGREGATION

	December 31, 2015
	Legacy				Acquired				Total
(Dollars in thousands)	Amount		% of Outstanding Balance		Amount		% of Outstanding Balance		Amount		% of Outstanding Balance
Accruing loans:
30-59 days past due	$	13,839	0.12	%	$	9,039	0.29	%	$	22,878	0.16	%
60-89 days past due	6,270		0.07		6,431		0.21		12,701		0.09
90-119 days past due	461		—		1,290		0.04		1,751		0.01
120 days past due or more	163		—		56		—		219		—
	20,733		0.19		16,816		0.54		37,549		0.26
Non-accrual loans (1)	50,928		0.46		103,497		3.30		154,425		1.08
	$	71,661	0.65	%	$	120,313	3.84	%	$	191,974	1.34	%

	December 31, 2014
	Legacy				Acquired				Total
(Dollars in thousands)	Amount		% of Outstanding Balance		Amount		% of Outstanding Balance		Amount		% of Outstanding Balance
Accruing loans:
30-59 days past due	$	23,365	0.24	%	$	14,814	0.84	%	$	38,179	0.33	%
60-89 days past due	6,202		0.06		6,760		0.38		12,962		0.11
90-119 days past due	738		0.01		935		0.05		1,673		0.02
120 days past due or more	16		—		19		—		35		—
	30,321		0.31		22,528		1.27		52,849		0.46
Non-accrual loans (1)	34,970		0.36		134,716		7.60		169,686		1.48
	$	65,291	0.67	%	$	157,244	8.87	%	$	222,535	1.94	%

(1) The acquired loans balance represents the outstanding balance of loans that would otherwise meet the Company’s definition of non-accrual loans.

Total past due loans decreased $30.6 million from December 31, 2014 to $192.0 million at December 31, 2015. The change was due to decreases of $15.3 million in non-accrual loans and $15.6 million of loans 30-89 days past due, offset by increases in accruing loans more than 90 days past due of $0.3 million.

Total legacy loans past due increased $6.4 million, or 10%, from December 31, 2014 to $71.7 million at December 31, 2015. The change was due to an increase of $16.0 million in non-accrual loans, offset by decreases of $9.5 million of loans 30-89 days past due and $0.1 million of accruing loans more than 90 days past due.

Total acquired past due loans decreased $36.9 million, or 23%, from December 31, 2014 to $120.3 million at December 31, 2015. The change was primarily attributable to a decrease of $31.2 million in non-accrual loans and a decrease of $6.1 million in loans 30-89 days past due, offset by an increase of $0.4 million in accruing loans more than 90 days past due.

Allowance for Credit Losses

The allowance for credit losses represents management’s best estimate of probable credit losses inherent at the balance sheet date. Determination of the allowance for credit losses involves a high degree of complexity and requires significant judgment. Several factors are taken into consideration in the determination of the overall allowance for credit losses. Based on facts and circumstances available, management of the Company believes that the allowance for credit losses was appropriate at December 31, 2015 to cover probable losses in the Company’s loan portfolio. However, future adjustments to the allowance may be necessary, and the results of operations could be adversely affected, if circumstances differ substantially from the assumptions used by management in determining the allowance for credit losses. See the “Application of Critical Accounting Policies and Estimates” and Note 1, Summary of Significant Accounting Policies, to the Notes to the consolidated financial statements for more information.

Legacy Loans

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Legacy loans represent loans accounted for under ASC 310-20. The Company’s legacy loans include loans originated by the Company. See Note 1, Summary of Significant Accounting Policies, to the Notes to the consolidated financial statements for more information.

Acquired Loans

Acquired loans, which include covered loans and certain non-covered loans, represent loans acquired by the Company that are accounted for in accordance with ASC 310-20 or ASC 310-30. See Note 1, Summary of Significant Accounting Policies, for more information.

Loans acquired in business combinations were recorded at their acquisition date fair values, which were based on expected cash flows and included estimates of expected future credit losses. If the Company determines that losses arose after the acquisition date, the additional losses will be reflected as a provision for credit losses.

At December 31, 2015, the Company had an allowance for credit losses of $44.6 million to reserve for probable or expected losses currently in the acquired loan portfolio that have arisen after the losses estimated at the respective acquisition dates.

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The following tables set forth the activity in the Company’s allowance for credit losses.

TABLE 20—SUMMARY OF ACTIVITY IN THE ALLOWANCE FOR CREDIT LOSSES

(Dollars in thousands)	2015			2014			2013			2012			2011
Allowance for loan losses at beginning of period	$	130,131		$	143,074		$	251,603		$	193,761		$	136,100
Transfer of balance to OREO	(1,221		)	(7,323		)	(28,126		)	(27,169		)	(17,143		)
Transfer of balance to the reserve for unfunded commitments	—			—			(9,828		)	—			—
Provision charged to operations	30,908			19,060			5,145			20,671			25,867
(Reversal of) provision recorded through the FDIC loss share receivable	(1,360		)	(4,260		)	(56,085		)	84,085			57,121
Charge-offs:
Commercial	(11,719		)	(16,215		)	(19,220		)	(16,747		)	(9,200		)
Residential Mortgage	(291		)	(811		)	(518		)	(2,376		)	(244		)
Consumer and other	(14,505		)	(9,829		)	(6,743		)	(5,937		)	(6,715		)
	(26,515		)	(26,855		)	(26,481		)	(25,060		)	(16,159		)
Recoveries:
Commercial	2,831			3,107			3,745			3,293			5,516
Residential Mortgage	74			248			765			38			170
Consumer and other	3,530			3,080			2,336			1,984			2,289
	6,435			6,435			6,846			5,315			7,975
Net charge-offs	(20,080		)	(20,420		)	(19,635		)	(19,745		)	(8,184		)
Allowance for loan losses at end of period	138,378			130,131			143,074			251,603			193,761
Reserve for unfunded lending commitments at beginning of period	11,801			11,147			—			—			—
Transfer of balance from the allowance for loan losses	—			—			9,828			—			—
Provision for unfunded lending commitments	2,344			654			1,319			—			—
Reserve for unfunded lending commitments at end of period	14,145			11,801			11,147			—			—
Allowance for credit losses at end of period	$	152,523		$	141,932		$	154,221		$	251,603		$	193,761
Allowance for loan losses to non-performing assets (1) (2)	149.96		%	129.39		%	87.54		%	88.30		%	96.40		%
Allowance for loan losses to total loans at end of period (2)	0.87			0.78			0.82			1.12			1.24
Net charge-offs to average loans (3)	0.08			0.07			0.05			0.07			0.13

(1) Non-performing assets include accruing loans 90 days or more past due.

(2) The allowance for loan losses in the calculation does not include either the allowance attributable to covered assets or covered loans.

(3) Net charge-offs exclude charge-offs and recoveries on covered loans and average loans exclude covered loans.

TABLE 21—ALLOCATION OF THE ALLOWANCE FOR CREDIT LOSSES

	2015				2014				2013				2012				2011
	Reserve %		% of Loans		Reserve %		% of Loans		Reserve %		% of Loans		Reserve %		% of Loans		Reserve %		% of Loans
Commercial	73	%	71	%	70	%	69	%	69	%	72	%	71	%	73	%	73	%	73	%
Mortgage	8	%	8	%	7	%	9	%	10	%	6	%	10	%	5	%	11	%	7	%
Consumer and other	19	%	21	%	23	%	22	%	21	%	22	%	19	%	22	%	16	%	20	%
Total allowance for credit losses	100	%	100	%	100	%	100	%	100	%	100	%	100	%	100	%	100	%	100	%

The allowance for credit losses was $152.5 million at December 31, 2015, or 1.06% of total loans, $10.6 million higher than at December 31, 2014. The allowance for credit losses as a percentage of loans was 1.24% at December 31, 2014.

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The allowance for credit losses on the legacy portfolio increased $20.0 million, or 23%, since December 31, 2014, primarily aresult of $1.5 billion, or 16%, legacy loan growth in 2015. The acquired allowance for credit losses includes a reserve of $44.6 million for losses probable in the portfolio at December 31, 2015 above estimated expected credit losses at acquisition, a decrease of $9.4 million, or 17%, from December 31, 2014.

At December 31, 2015 and 2014, the allowance for loan losses covered non-performing legacy loans 1.8 times and 2.1 times, respectively. Including acquired loans, the allowance for loan losses covered 72% of total past due and non-accrual loans at December 31, 2015 and 58% at 2014.

FDIC Loss Share Receivable

As part of the FDIC-assisted acquisitions in 2009 and 2010, the Company recorded a receivable from the FDIC, which represented the fair value of the expected reimbursable losses covered by the loss share agreements as of the acquisition dates. The FDIC loss share receivable decreased $29.7 million, or 43%, during 2015 due to amortization of $23.5 million, submission of reimbursable losses to the FDIC of $2.4 million, OREO cash flow improvements of $2.4 million, and the reversal of the loan loss provision due to changes in the timing of estimated cash flows on covered loans of $1.4 million. See Note 7, Loss Sharing Agreements and FDIC Loss Share Receivable, to the consolidated financial statements for discussion of the reimbursable loss periods of the loss share agreements.

In 2014, based on improving economic trends, their impact on the amount and timing of expected future cash flows, and delays in the foreclosure process, the Company concluded that certain expected losses were probable of not being collected from the FDIC or the customer because such projected losses were anticipated to occur beyond the reimbursable periods of the loss share agreements. Therefore, the Company recognized a valuation allowance against the indemnification assets in the amount of $5.1 million in 2014 through a charge to net income. No such impairment charge was deemed necessary in 2015.

Of the FDIC loss share receivables balance of $39.9 million at December 31, 2015, approximately $7.5 million is expected to be collected from the FDIC, $30.7 million, which represents improvements in cash flows expected to be collected from customers, is expected to be amortized over time, and $1.7 million is expected to be collected in conjunction with OREO transactions.

Cash and cash equivalents

Cash and cash equivalents totaled $510.3 million at December 31, 2015, a decrease of $37.9 million, or 7%, from year-end 2014. Cash and due from banks decreased $10.3 million to $241.7 million at December 31, 2015. Short-term investments result from excess funds invested overnight in interest-bearing deposit accounts at the FRB and the FHLB of Dallas. These balances fluctuate daily depending on the funding needs of the Company and earn interest at the current FHLB and FRB discount rates. The balance in interest-bearing deposits at other institutions of $268.6 million at December 31, 2015 decreased $27.5 million, or 9%, from December 31, 2014. The primary cause was the Company’s use of available cash to purchase higher-yielding investment securities, fund loan growth, and pay down its long-term debt, all in an attempt to improve its net interest margin. The Company’s cash activity is further discussed in the “Liquidity and Other Off-Balance Sheet Activities” section below.

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Other Assets

The following table details other asset balances as of December 31:

TABLE 22—OTHER ASSETS COMPOSITION

											2015 vs. 2014
(Dollars in thousands)	2015		2014		2013		2012		2011		$ Change		% Change
Other Earning Assets
FHLB and FRB stock	$	66,008	$	74,130	$	53,773	$	46,216	$	60,155	(8,122	)	(11	)
Fed funds sold and financing transactions	—		—		—		4,875		—		—		—
Other interest-earning assets (1)	5,660		5,412		3,412		3,412		3,412		248		5
Total other earning assets	71,668		79,542		57,185		54,503		63,567		(7,874	)	(10	)
Non-Earning Assets
Bank-owned life insurance	131,575		122,573		104,203		100,556		96,876		9,002		7
Core deposit intangibles	30,044		19,595		14,622		19,122		24,021		10,449		53
Title plant and other intangible assets	7,224		7,511		7,439		7,660		7,911		(287	)	(4	)
Accrued interest receivable	47,863		37,696		32,143		32,183		36,006		10,167		27
Other real estate owned	34,131		53,947		99,173		121,536		125,046		(19,816	)	(37	)
Derivative market value	30,486		32,903		30,076		42,119		33,026		(2,417	)	(7	)
Investment in tax credit entities	141,951		139,326		132,487		137,508		120,247		2,625		2
Other non-earning assets	155,965		95,606		76,839		50,532		85,412		60,359		63
Total non-earning assets	579,239		509,157		496,982		511,216		528,545		70,082		14
Total other assets	$	650,907	$	588,699	$	554,167	$	565,719	$	592,112	62,208		11

(1) Other interest-earning assets are composed primarily of trust preferred common securities.

The $8.1 million decrease in FHLB and FRB stock was the result of $30.1 million in stock sales, $16.4 million in stock purchases, $5.5 million in acquired stock, and less than $1.0 million in dividends received during 2015.

Bank-owned life insurance increased $9.0 million as a result of increases in the carrying values of policies held and $3.9 million in acquired policies from Old Florida.

Core deposit intangibles increased $10.4 million during the current year, the result of an additional $18.1 million in core deposit intangibles recorded as part of the Florida Bank Group, Old Florida and Georgia Commerce acquisitions, which was partially offset by amortization expense recorded during 2015.

Other real estate includes all real estate, other than bank premises used in bank operations, which is owned or controlled by the Company, including real estate acquired in settlement of loans and former bank premises no longer used. The $19.8 million decrease in OREO from December 31, 2014 was a result of the sale of OREO properties.

The $60.4 million increase in other non-earning assets since December 31, 2014 was primarily the result of a $53.9 million increase in the Company’s deferred tax asset accounts arising from acquisitions, as well as adjustments recorded related to amended tax returns from prior years.

FUNDING SOURCES

Deposits obtained from clients in its primary market areas are the Company’s principal source of funds for use in lending and other business purposes. The Company attracts local deposit accounts by offering a wide variety of products, competitive interest rates and convenient branch office locations and service hours. Increasing core deposits through acquisitions and the development of client relationships is a continuing focus of the Company. Short-term and long-term borrowings have become an important funding source as the Company has grown. Other funding sources include subordinated debt and shareholders’ equity. Refer to the “Liquidity and Other Off-Balance Sheet Activities” section below for further discussion of the Company’s

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sources and uses of funding. The following discussion highlights the major changes in the mix of deposits and other funding sources during 2015.

Deposits

The Company’s ability to attract and retain customer deposits is critical to the Company’s continued success. During 2015, total deposits increased $3.7 billion, or 29%, totaling $16.2 billion at December 31, 2015. Total non-interest-bearing deposits increased $1.2 billion, or 36%, and interest-bearing deposits increased $2.5 billion, or 27%, from December 31, 2014. Acquired deposits of $2.7 billion from Florida Bank Group, Old Florida, and Georgia Commerce accounted for the majority of the increase from year-end, while $1.0 billion, or 26% of the total growth from December 31, 2014, was a result of organic deposit growth.

The following table and chart set forth the composition of the Company’s deposits as of December 31:

TABLE 23—DEPOSIT COMPOSITION BY PRODUCT

																					2015 vs. 2014
(Dollars in thousands)	2015				2014				2013				2012				2011				$ Change		% Change
Non-interest-bearing deposits	$	4,352,229	27	%	$	3,195,430	26	%	$	2,575,939	24	%	$	1,967,662	18	%	$	1,485,058	16	%	$	1,156,799	36	%
NOW accounts	2,974,176		19		2,462,841		20		2,283,491		22		2,523,252		24		1,876,797		20		511,335		21	%
Money market accounts	6,010,882		37		4,168,504		33		3,779,581		35		3,738,480		35		3,049,151		33		1,842,378		44	%
Savings accounts	716,838		4		577,513		4		387,397		3		364,703		3		332,351		3		139,325		24	%
Certificates of deposit and other time deposits	2,124,623		13		2,116,237		17		1,710,592		16		2,154,180		20		2,545,656		28		8,386		—	%
Total deposits	$	16,178,748	100	%	$	12,520,525	100	%	$	10,737,000	100	%	$	10,748,277	100	%	$	9,289,013	100	%	$	3,658,223	29	%

From a market perspective, total deposit growth (excluding acquired deposits) was seen primarily in the Houston, Dallas, New Orleans, and Naples markets. Houston’s customer deposits increased $276.5 million, or 26%, during 2015, while total deposits in the Dallas market increased $131.6 million, or 42%, since the end of 2014. New Orleans had year-to-date customer deposit growth of $121.5 million, or 8% and Naples experienced growth of $102.4 million, or 13%.

Deposits by market for the years ending December 31, 2015 and 2014 are shown in the following charts.

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The following table details large-denomination certificates of deposit by remaining maturity dates at December 31.

TABLE 24—REMAINING MATURITIES OF CDS $100,000 AND OVER

(Dollars in thousands)	2015				2014				2013				2012				2011
3 months or less	$	228,336	16	%	$	204,041	19	%	$	256,931	28	%	$	265,558	23	%	$	316,771	23	%
3 – 12 months	631,634		46		547,876		51		452,005		50		572,734		50		731,996		53
12 – 36 months	390,820		28		274,038		25		157,430		17		227,072		20		213,865		16
More than 36 months	135,950		10		54,844		5		39,976		5		81,151		7		114,999		8
Total CDs $100,000 and over	$	1,386,740	100	%	$	1,080,799	100	%	$	906,342	100	%	$	1,146,515	100	%	$	1,377,631	100	%

Short-term Borrowings

The Company may obtain advances from the FHLB of Dallas based upon its ownership of FHLB stock and certain pledges of its real estate loans and investment securities, provided certain standards related to the Company’s creditworthiness have been met. These advances are made pursuant to several credit programs, each of which has its own interest rate and range of maturities. The level of short-term borrowings can fluctuate significantly on a daily basis depending on funding needs and the source of funds chosen to satisfy those needs.

The Company also enters into repurchase agreements to facilitate customer transactions that are accounted for as secured borrowings. These transactions typically involve the receipt of deposits from customers that the Company collateralizes with its investment portfolio and have rates ranging from 0.09% to 0.65%. The following table details the average and ending balances of repurchase transactions as of and for the years ending December 31:

TABLE 25—REPURCHASE TRANSACTIONS

(Dollars in thousands)	2015		2014
Average balance	$	236,206	$	282,596
Ending balance	216,617		242,742

Total short-term borrowings decreased $519.1 million, or 61%, from December 31, 2014, to $326.6 million at the end of 2015, a result of a net decrease of $493.0 million in FHLB advances outstanding and $26.1 million decrease in repurchase agreements. On an average basis, short-term borrowings decreased $356.0 million, or 46%, from 2014, due to repayment of FHLB advances during 2015.

Total short-term borrowings were 2% of total liabilities and 49% of total borrowings at December 31, 2015 compared to 6% and 68%, respectively, at December 31, 2014. On an average basis, short-term borrowings were 3% of total liabilities and 52% of total borrowings in 2015, compared to 6% and 70%, respectively, during 2014.

The weighted average rate paid on short-term borrowings was 0.18% during 2015, up one basis point compared to 0.17% in 2014. For additional information on the Company’s short-term borrowings, see Note 13, Short-Term Borrowings, to the Notes to the consolidated financial statements.

Long-term Debt

Long-term debt decreased $62.8 million, or 16%, to $340.4 million from $403.3 million at December 31, 2014, due to FHLB borrowing paydowns of approximately $201.3 million as part of a deleveraging strategy, partially offset by borrowings acquired from acquisitions during the period. The Company incurred approximately $1.3 million of loss on early extinguishment of debt during 2015. On a period-end basis, long-term debt was 2% and 3% of total liabilities at December 31, 2015 and 2014, respectively. On average, long-term debt increased to $388.2 million in 2015, $53.0 million, or 16%, higher than 2014. Average long-term debt was 2% of total liabilities during the current year, compared to 3% during 2014.

Long-term debt at December 31, 2015 included $136.6 million in fixed-rate advances from the FHLB of Dallas that cannot be prepaid without incurring substantial penalties. The remaining debt consisted of $120.1 million of the Company’s junior subordinated debt, and $83.7 million in notes payable on investments in new market tax credit entities. The trust preferred securities are issued to statutory trusts that were funded by the issuance of floating rate capital securities of the trusts. Interest on the junior subordinated debt is payable quarterly and may be deferred at any time at the election of the Company for up to 20 consecutive quarterly periods. During any deferral period, the Company is subject to certain restrictions, including being prohibited from declaring dividends to its common shareholders. The junior subordinated debt is redeemable by the Company in whole or in part. For additional information, see Note 14, Long-Term Debt, to the Notes to the consolidated financial statements.

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CAPITAL RESOURCES

Federal regulations impose minimum regulatory capital requirements on all institutions with deposits insured by the FDIC. The FRB imposes similar capital regulations on bank holding companies. Compliance with bank and bank holding company regulatory capital requirements, which include leverage and risk-based capital guidelines, are monitored by the Company on an ongoing basis. Under the risk-based capital method, a risk weight is assigned to balance sheet and off-balance sheet items based on regulatory guidelines.

In July 2013, the U.S. banking regulatory agencies, including the FRB, approved a final rule to implement the revised capital adequacy standards of the BCBS or Basel III, and to address relevant provisions of the Dodd-Frank Act. The Company and IBERIABANK became subject to the new rules on January 1, 2015. Certain provisions of the new rules will be phased in from that date to January 1, 2019.

The final rules:

• Require that non-qualifying capital instruments, including trust preferred securities and cumulative perpetual preferred stock, must be fully phased out of Tier 1 capital by January 1, 2016,

• Establish new qualifying criteria for regulatory capital, including new limitations on the inclusion of deferred tax assets and mortgage servicing rights,

• Require a minimum ratio of common equity Tier 1, or "CET1", capital to risk-weighted assets of 4.5%,

• Increase the minimum Tier 1 capital to risk-weighted assets ratio requirements from 4% to 6%,

• Retain the minimum total capital to risk-weighted assets ratio requirement of 8%,

• Establish a minimum leverage ratio requirement of 4%,

• Retain the existing regulatory capital framework for 1-4 family residential mortgage exposures,

• Implement a new capital conservation buffer requirement for a banking organization to maintain a buffer composed of CET1 capital in an amount greater than 2.5% above the minimum CET1 capital, Tier 1 capital and total risk-based capital ratios in order to avoid limitations on capital distributions, including dividend payments, and certain discretionary bonus payments to executive officers. The capital conservation buffer requirement will be phased in beginning on January 1, 2016 at 0.625%, and will be fully phased in at 2.50% by January 1, 2019. A banking organization with a buffer of less than the required amount would be subject to increasingly stringent limitations on such distributions and payments as the buffer approaches zero. The new rule also generally prohibits a banking organization from making such distributions or payments (subject to the above phase-in period) during any quarter if its eligible retained income is negative and its capital conservation buffer ratio was 2.5% or less at the end of the previous quarter. The eligible retained income of a banking organization is defined as its net income for the four calendar quarters preceding the current calendar quarter, based on the organization’s quarterly regulatory reports, net of any distributions and associated tax effects not already reflected in net income,

• Increase capital requirements for past-due loans, high volatility commercial real estate exposures, and certain short-term commitments and securitization exposures,

• Expand the recognition of collateral and guarantors in determining risk-weighted assets, and

• Remove references to credit ratings consistent with the Dodd-Frank Act and establish due diligence requirements for securitization exposures.

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At December 31, 2015 and 2014, the Company exceeded all required regulatory capital ratios, and the regulatory capital ratios of IBERIABANK were in excess of the levels established for “well-capitalized” institutions, as shown in the following table and chart.

TABLE 26—REGULATORY CAPITAL RATIOS

Ratio	Entity	2015 Well- Capitalized Minimums	December 31, 2015		December 31, 2014
			Actual		Actual
Tier 1 Leverage	IBERIABANK Corporation	N/A	9.52	%	9.35	%
	IBERIABANK	5.00	9.03		8.44
Common Equity Tier 1 (CET1)	IBERIABANK Corporation	N/A	10.07		N/A
	IBERIABANK	6.50	10.14		N/A
Tier 1 risk-based capital	IBERIABANK Corporation	N/A	10.70		11.17
	IBERIABANK	8.00	10.14		10.08
Total risk-based capital	IBERIABANK Corporation	N/A	12.14		12.30
	IBERIABANK	10.00	11.05		11.21

At December 31, 2015 and 2014, $29.1 million and $108.5 million, respectively, of the Company’s junior subordinated debt was included as Tier 1 capital in the Company’s risk-based capital ratios above. Effective January 1, 2015, 75% of the Company’s junior subordinated debt was excluded from Tier 1 capital. Beginning January 1, 2016, the remaining 25% of junior subordinated debt included in the Company's Tier 1 capital ratio at year-end 2015 was phased into Tier 2 capital for future periods. The resulting impact on Tier 1 capital ratios is estimated to be a reduction of approximately 17 basis points. No impact on the Company's total risk-based capital ratio is associated with this change.

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The decrease in IBERIABANK Corporation's Tier 1 risk-based capital ratio from December 31, 2014 was primarily the result of the implementation of the Basel III standards and its effect on risk-weighted assets, as well as the phase-out of the trust preferred securities from Tier 1 capital in 2015. The decrease in IBERIABANK Corporation’s total risk-based capital ratio from December 31, 2014 was also primarily the result of the implementation of the BASEL III standards in 2015, most notably as it relates to the risk-weighting of high volatility commercial real estate and past due loans. Also affecting capital ratios at December 31, 2015 was a decrease in assets covered under loss-sharing agreements with the FDIC, which typically are assigned a lower risk rating. During 2015, the Company’s loss-share protection on certain acquired non-single family loans associated with its FDIC-assisted transactions expired, increasing the risk weighting associated with these assets, from a weighting of 20% to 100%.

On August 5, 2015, the Company issued an aggregate of 3.2 million depositary shares (the “Depositary Shares”), each representing a 1/400th ownership interest in a share of the Company’s 6.625% Fixed-to-Floating Non-Cumulative Perpetual Preferred Stock, Series B, par value $1.00 per share, (“Series B Preferred Stock”), with a liquidation preference of $10,000 per share of Series B Preferred Stock (equivalent to $25 per depositary share), which represents $80,000,000 in aggregate liquidation preference. On January 4, 2016, the Company declared a semi-annual cash dividend of $0.805 per depositary share, which was paid on February 1, 2016.

Management believes that at December 31, 2015, the Company and IBERIABANK would have met all capital adequacy requirements on a fully phased-in basis if such requirements were then effective. There can be no assurances that the Basel III capital rules will not be revised before the expiration of the phase-in periods.

LIQUIDITY AND OTHER OFF-BALANCE SHEET ACTIVITIES

Liquidity refers to the Company’s ability to generate sufficient cash flows to support its operations and to meet its obligations, including the withdrawal of deposits by customers, commitments to originate loans, and its ability to repay its borrowings and other liabilities. Liquidity risk is the risk to earnings or capital resulting from the Company’s inability to fulfill its obligations as they become due. Liquidity risk also develops from the Company’s failure to timely recognize or address changes in market conditions that affect the ability to liquidate assets in a timely manner or to obtain adequate funding to continue to operate on a profitable basis.

The primary sources of funds for the Company are deposits and borrowings. Other sources of funds include repayments and maturities of loans and investment securities, securities sold under agreements to repurchase, and, to a lesser extent, off-balance sheet borrowing availability. Certificates of deposit scheduled to mature in one year or less at December 31, 2015 totaled $1.4 billion. Based on past experience, management believes that a significant portion of maturing deposits will remain with the Company. Additionally, the majority of the investment securities portfolio is classified as available-for-sale, which provides the ability to liquidate unencumbered securities as needed. Of the $2.9 billion in the investment securities portfolio, $1.5 billion is unencumbered and $1.4 billion has been pledged to support repurchase transactions, public funds deposits and certain long-term borrowings. Due to the relatively short implied duration of the investment securities portfolio, the Company has historically experienced significant cash inflows on a regular basis. Securities cash flows are highly dependent on prepayment speeds and could change materially as economic or market conditions change. See Note 12, Deposits, Note 13, Short-Term Borrowings, and Note 14, Long-Term Debt, to the consolidated financial statements for additional discussion related to the Company’s funding requirements.

Scheduled cash flows from the amortization and maturities of loans and securities are relatively predictable sources of funds. Conversely, deposit flows, prepayments of loan and investment securities, and draws on customer letters and lines of credit are greatly influenced by general interest rates, economic conditions, competition, and customer demand. The FHLB of Dallas provides an additional source of liquidity to make funds available for general requirements and also to assist with the variability of less predictable funding sources. At December 31, 2015, the Company had $246.6 million of outstanding FHLB advances, $110.0 million of which was short-term and $136.6 million was long-term. Additional FHLB borrowing capacity available at December 31, 2015 amounted to $4.6 billion. At December 31, 2015, the Company also has various funding arrangements with commercial banks providing up to $180.0 million in the form of federal funds and other lines of credit. At December 31, 2015, there were no balances outstanding on these lines and all of the funding was available to the Company.

Liquidity management is both a daily and long-term function of business management. The Company manages its liquidity with the objective of maintaining sufficient funds to respond to the predicted needs of depositors and borrowers and to take advantage of investments in earning assets and other earnings enhancement opportunities. Excess liquidity is generally invested in short-term investments such as overnight deposits. On a longer-term basis, the Company maintains a strategy of investing in various lending and investment security products. The Company uses its sources of funds primarily to fund loan commitments and meet its ongoing commitments associated with its operations. Based on its available cash at December 31, 2015 and current deposit modeling, the Company believes it has adequate liquidity to fund ongoing operations. The Company has adequate

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availability of funds from deposits, borrowings, repayments and maturities of loans and investment securities to provide the Company additional working capital if needed.

In the normal course of business, the Company is a party to a number of activities that contain credit, market and operational risk that are not reflected in whole or in part in the Company’s consolidated financial statements. Such activities include traditional off-balance sheet credit-related financial instruments, commitments under operating leases, and long-term debt. The Company provides customers with off-balance sheet credit support through loan commitments, lines of credit, and standby letters of credit. Many of the commitments are expected to expire unused or be only partially used; therefore, the total amount of commitments does not necessarily represent future cash requirements. Based on its available liquidity and available borrowing capacity, the Company anticipates it will continue to have sufficient funds to meet its current commitments. At December 31, 2015, the Company’s unfunded loan commitments outstanding totaled $61.2 million. At the same date, unused lines of credit, including credit card lines, amounted to $4.6 billion, as shown in the following table.

TABLE 27—COMMITMENT EXPIRATION PER PERIOD

(Dollars in thousands)	Less than 1 year		1—3 Years		3—5 Years		Over 5 Years		Total
Unused lines of credit	$	2,039,892	$	1,465,776	$	678,109	$	434,025	$	4,617,802
Unfunded loan commitments	61,240		—		—		—		61,240
Standby letters of credit	129,292		16,852		4,137		—		150,281
	$	2,230,424	$	1,482,628	$	682,246	$	434,025	$	4,829,323

The Company has entered into a number of long-term arrangements to support the ongoing activities of the Company. The required payments under such leasing and other debt commitments at December 31, 2015 are shown in the following table.

TABLE 28—CONTRACTUAL OBLIGATIONS AND OTHER DEBT COMMITMENTS

(Dollars in thousands)	2016		2017		2018		2019		2020		2021 and After		Total
Operating leases	$	16,957	$	14,751	$	13,491	$	11,952	$	10,735	$	41,054	$	108,940
Certificates of deposit	1,380,655		423,866		112,915		64,170		81,418		61,599		2,124,623
Short-term borrowings	326,617		—		—		—		—		—		326,617
Long-term debt	34,789		61,899		21,057		7,865		16,308		198,529		340,447
	$	1,759,018	$	500,516	$	147,463	$	83,987	$	108,461	$	301,182	$	2,900,627

ASSET/LIABILITY MANAGEMENT, MARKET RISK AND COUNTERPARTY CREDIT RISK

The principal objective of the Company’s asset and liability management function is to evaluate the interest rate risk included in certain balance sheet accounts, determine the appropriate level of risk given the Company’s business focus, operating environment, capital and liquidity requirements, and performance objectives, establish prudent asset concentration guidelines and manage the risk consistent with Board approved guidelines. Through such management, the Company seeks to reduce the vulnerability of its operations to changes in interest rates. The Company’s actions in this regard are taken under the guidance of the Asset and Liability Committee. The Asset and Liability Committee normally meets monthly to review, among other things, the sensitivity of the Company’s assets and liabilities to interest rate changes, local and national market conditions, and interest rates. In connection therewith, the Asset and Liability Committee generally reviews the Company’s liquidity, cash flow needs, composition of investments, deposits, borrowings, and capital position.

The objective of interest rate risk management is to control the effects that interest rate fluctuations have on net interest income and on the net present value of the Company’s earning assets and interest-bearing liabilities. Management and the Board are responsible for managing interest rate risk and employing risk management policies that monitor and limit this exposure. Interest rate risk is measured using net interest income simulation and asset/liability net present value sensitivity analyses. The Company uses financial modeling to measure the impact of changes in interest rates on the net interest margin and to predict market risk. Estimates are based upon numerous assumptions including the nature and timing of interest rate levels including yield curve shape, prepayments on loans and securities, deposit decay rates, pricing decisions on loans and deposits, reinvestment/replacement of asset and liability cash flows, and others. These analyses provide a range of potential impacts on net interest income and portfolio equity caused by interest rate movements.

42

Included in the modeling are instantaneous parallel rate shift scenarios, which are utilized to establish exposure limits. These scenarios are known as “rate shocks” because all rates are modeled to change instantaneously by the indicated shock amount, rather than a gradual rate shift over a period of time that has traditionally been more realistic.

The Company’s interest rate risk model indicates that the Company is asset sensitive in terms of interest rate sensitivity. Based on the Company’s interest rate risk model at December 31, 2015, the table below illustrates the impact of an immediate and sustained 100 and 200 basis point increase or decrease in interest rates on net interest income.

TABLE 29—INTEREST RATE SENSITIVITY

Shift in Interest Rates (in bps)	% Change in Projected Net Interest Income
+200	9.9%
+100	4.9%
-100	(4.5)%
-200	(8.6)%

The influence of using the forward curve as of December 31, 2015 as a basis for projecting the interest rate environment would approximate a 1.7% increase in net interest income over the next 12 months. The computations of interest rate risk shown above are performed on a flat balance sheet and do not necessarily include certain actions that management may undertake to manage this risk in response to unanticipated changes in interest rates and other factors to include shifts in deposit behavior.

The short-term interest rate environment is primarily a function of the monetary policy of the FRB. The principal tools of the FRB for implementing monetary policy are open market operations, or the purchases and sales of U.S. Treasury and Federal agency securities, as well as the establishment of a short-term target rate. The FRB’s objective for open market operations has varied over the years, but the focus has gradually shifted toward attaining a specified level of the Federal funds rate to achieve the long-run goals of price stability and sustainable economic growth. The Federal funds rate is the basis for overnight funding and drives the short end of the yield curve. Longer maturities are influenced by the market’s expectations for economic growth and inflation, but can also be influenced by FRB purchases and sales and expectations of monetary policy going forward.

The Federal Open Market Committee (“FOMC”) of the FRB, in an attempt to stimulate the overall economy, has, among other things, kept interest rates low through its targeted Federal funds rate. On December 17, 2015, the FOMC voted to raise the target Federal funds rate by 0.25%, the first increase since 2006. The FOMC expects that economic conditions will evolve in a manner that will warrant only gradual increases in the Federal funds rate over the next several years. As the FOMC increases the Federal funds rate, it is possible that overall interest rates could rise, which may negatively impact the housing markets and the U.S. economic recovery. In addition, deflationary pressures, while possibly lowering our operating costs, could have a significant negative effect on our borrowers, especially our commercial borrowers, and the values of collateral securing loans, which could negatively affect our financial performance.

The Company’s commercial loan portfolio is also impacted by fluctuations in the level of the LIBOR, as a large portion of this portfolio reprices based on this index. Our net interest income may be reduced if more interest-earning assets than interest-bearing liabilities reprice or mature during a period when interest rates are declining, or more interest-bearing liabilities than interest-earning assets reprice or mature during a period when interest rates are rising.

The table below presents the Company’s anticipated repricing of loans and investment securities over the next four quarters.

TABLE 30—REPRICING OF CERTAIN EARNING ASSETS ⁽¹⁾ 

(Dollars in thousands)	1Q 2016		2Q 2016		3Q 2016		4Q 2016		Total less than one year
Investment securities	$	270,563	$	90,925	$	98,888	$	95,744	$	556,120
Fixed rate loans	609,537		560,292		479,342		463,848		2,113,019
Variable rate loans	6,765,133		125,357		71,945		62,147		7,024,582
Total loans	7,374,670		685,649		551,287		525,995		9,137,601
	$	7,645,233	$	776,574	$	650,175	$	621,739	$	9,693,721

⁽¹⁾ Amounts include expected maturities, scheduled paydowns, expected prepayments, and loans subject to floors and exclude the repricing of assets from prior periods, as well as non-accrual loans and market value adjustments.

43

As part of its asset/liability management strategy, the Company has emphasized the origination of loans with adjustable or variable rates of interest as well as commercial and consumer loans, which typically have shorter terms than residential mortgage loans. The majority of fixed-rate, long-term residential loans are sold in the secondary market to avoid assumption of the interest rate risk associated with longer duration assets in the current low rate environment. As of December 31, 2015, $7.5 billion, or 52%, of the Company’s total loan portfolio had adjustable interest rates. The Company had no significant concentration to any single borrower or industry segment at December 31, 2015.

The Company’s strategy with respect to liabilities in recent periods has been to emphasize transaction accounts, particularly non-interest or low interest-bearing transaction accounts, which are significantly less sensitive to changes in interest rates. At December 31, 2015, 87% of the Company’s deposits were in transaction and limited-transaction accounts, compared to 83% at December 31, 2014. Non-interest-bearing transaction accounts were 27% of total deposits at December 31, 2015, compared to 26% of total deposits at December 31, 2014.

Much of the liquidity increase experienced in the past several years has been due to a significant increase in non-interest-bearing demand deposits. The behavior of non-interest-bearing deposits and other types of demand deposits is one of the most important assumptions used in determining the interest rate and liquidity risk positions. A loss of these deposits in the future would reduce the asset sensitivity of the Company’s balance sheet as interest-bearing funds would most likely be increased to offset the loss of this favorable funding source.

The table below presents the Company’s anticipated repricing of liabilities over the next four quarters.

TABLE 31—REPRICING OF LIABILITIES ⁽¹⁾ 

(Dollars in thousands)	1Q 2016		2Q 2016		3Q 2016		4Q 2016		Total less than one year
Time deposits	$	744,290	$	447,543	$	309,167	$	224,718	$	1,725,718
Short-term borrowings	326,617		—		—		—		326,617
Long-term debt	129,799		11,756		1,707		15,497		158,759
	$	1,200,706	$	459,299	$	310,874	$	240,215	$	2,211,094

⁽¹⁾ Amounts exclude the repricing of liabilities from prior periods.

As part of an overall interest rate risk management strategy, derivative instruments may also be used as an efficient way to modify the repricing or maturity characteristics of on-balance sheet assets and liabilities. Management may from time to time engage in interest rate swaps to effectively manage interest rate risk. The interest rate swaps of the Company would modify net interest sensitivity to levels deemed appropriate.

IMPACT OF INFLATION OR DEFLATION AND CHANGING PRICES

The consolidated financial statements and related financial data presented herein have been prepared in accordance with GAAP, which generally require the measurement of financial position and operating results in terms of historical dollars, without considering changes in relative purchasing power over time due to inflation. Unlike most industrial companies, the majority of the Company’s assets and liabilities are monetary in nature. As a result, interest rates generally have a more significant impact on the Company’s performance than does the effect of inflation. Although fluctuations in interest rates are neither completely predictable nor controllable, the Company regularly monitors its interest rate position and oversees its financial risk management by establishing policies and operating limits. Interest rates do not necessarily move in the same direction or in the same magnitude as the prices of goods and services, since such prices are affected by inflation to a larger extent than interest rates. Although not as critical to the banking industry as to other industries, inflationary factors may have some impact on the Company’s growth, earnings, total assets and capital levels. Management does not expect inflation to be a significant factor in 2016.

Conversely, a period of deflation could affect our business, as well as all financial institutions and other industries. Deflation could lead to lower profits, higher unemployment, lower production and deterioration in overall economic conditions. In addition, deflation could depress economic activity, including loan demand and the ability of borrowers to repay loans, and consequently impair earnings through increasing the value of debt while decreasing the value of collateral for loans.

Management believes the most significant potential impact of deflation on financial results relates to the Company's ability to maintain a sufficient amount of capital to cushion against future losses. However, the Company would employ certain risk management tools to maintain its balance sheet strength in the event a deflationary scenario were to develop.

44

Non-GAAP Measures

The discussion and analysis included herein contains financial information determined by methods other than in accordance with GAAP. The Company’s management uses these non-GAAP financial measures in their analysis of the Company’s performance. These measures typically adjust GAAP performance measures to exclude the effects of the amortization of intangibles and include the tax benefit associated with revenue items that are tax-exempt, as well as adjust income available to common shareholders for certain significant activities or transactions that, in management’s opinion can distort period-to-period comparisons of the Company’s performance. Since the presentation of these GAAP performance measures and their impact differ between companies, management believes presentations of these non-GAAP financial measures provide useful supplemental information that is essential to a proper understanding of the operating results of the Company’s core businesses. These non-GAAP disclosures should not be viewed as a substitute for operating results determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies. Reconciliations of GAAP to non-GAAP disclosures are included in the table below.

TABLE 32—RECONCILIATIONS OF NON-GAAP FINANCIAL MEASURES

	2015									2014									2013
(Dollars in thousands, except per share amounts)	Pre-tax			After-tax (2)			Per share (1)			Pre-tax			After-tax (2)			Per share (1)			Pre-tax			After-tax (2)			Per share (1)
Net income (GAAP)	$	206,938		$	142,844		$	3.68		$	141,065		$	105,382		$	3.30		$	81,261		$	65,128		$	2.20
Non-interest income adjustments:
(Gain) loss on sale of investments, net	(1,579		)	(1,026		)	(0.03		)	(773		)	(502		)	(0.01		)	(2,334		)	(1,517		)	(0.05		)
Other non-interest income	(2,454		)	(1,595		)	(0.04		)	(1,984		)	(1,817		)	(0.06		)	—			—			—
Total non-operating income	(4,033		)	(2,621		)	(0.07		)	(2,757		)	(2,319		)	(0.07		)	(2,334		)	(1,517		)	(0.05		)
Non-interest and other expense adjustments:
Merger-related expenses	24,074			15,861			0.41			15,093			10,104			0.32			783			509			0.02
Severance expenses	2,593			1,686			0.04			6,951			4,518			0.14			2,538			1,649			0.05
Impairment of long-lived assets, net of (gain) loss on sale	7,259			4,717			0.12			7,073			4,597			0.14			37,183			24,169			0.81
Debt prepayment	1,262			820			0.02			—			—			—			2,307			1,500			0.05
Other non-operating non-interest expense	1,272			827			0.02			(597		)	(388		)	(0.01		)	1,731			1,125			0.03
Total non-operating expenses	36,460			23,911			0.62			28,520			18,831			0.59			44,542			28,952			0.97
Income tax benefits	—			(2,041		)	(0.05		)	—			(2,959		)	(0.09		)	—			—			—
Operating earnings (non-GAAP)	239,365			162,093			4.18			166,828			118,935			3.72			123,469			92,563			3.12
Provision for loan losses	30,908			20,090			0.52			19,060			12,389			0.39			5,145			3,345			0.11
Pre-provision operating earnings (non-GAAP)	$	270,273		$	182,183		$	4.70		$	185,888		$	131,324		$	4.12		$	128,614		$	95,908		$	3.23

(1) Diluted per share amounts may not appear to foot due to rounding.

(2) After-tax amounts computed using a marginal tax rate of 35%.

45

(Dollars in thousands)	2015			2014			2013
Net interest income (GAAP)	$	587,758		$	460,111		$	390,244
Add: Effect of tax benefit on interest income	8,604			8,609			9,452
Net interest income (TE) (Non-GAAP)	$	596,362		$	468,720		$	399,696
Non-interest income (GAAP)	$	220,393		$	173,628		$	168,958
Add: Effect of tax benefit on non-interest income	2,346			2,947			1,964
Non-interest income (TE) (Non-GAAP)	$	222,739		$	176,575		$	170,922
Non-interest expense (GAAP)	$	570,305		$	473,614		$	472,796
Less: Intangible amortization expense	7,811			5,807			4,720
Tangible non-interest expense (Non-GAAP)	$	562,494		$	467,807		$	468,076
Net income (GAAP)	$	142,844		$	105,382		$	65,128
Add: Effect of intangible amortization, net of tax	5,077			3,775			3,068
Cash earnings (Non-GAAP)	$	147,921		$	109,157		$	68,196
Total assets (GAAP)	$	19,504,068		$	15,757,904		$	13,365,550
Less: Intangible assets, net	765,655			548,130			425,442
Total tangible assets (Non-GAAP)	$	18,738,413		$	15,209,774		$	12,940,108
Average assets (Non-GAAP)	$	18,402,706		$	14,631,994		$	13,003,988
Less: Average intangible assets, net	700,020			501,770			427,485
Total average tangible assets (Non-GAAP)	$	17,702,686		$	14,130,224		$	12,576,503
Total shareholders’ equity (GAAP)	$	2,498,835		$	1,852,148		$	1,530,346
Less: intangible assets, net	765,655			548,130			425,442
Total tangible shareholders’ equity (Non-GAAP)	$	1,733,180		$	1,304,018		$	1,104,904
Average shareholders’ equity (Non-GAAP)	$	2,261,034		$	1,707,359		$	1,527,193
Less: Average intangible assets, net	700,020			501,770			427,485
Average tangible shareholders’ equity (Non-GAAP)	$	1,561,014		$	1,205,589		$	1,099,708
Return on average assets	0.78		%	0.72		%	0.50		%
Effect of non-operating revenues and expenses	0.1			0.09			0.21
Operating return on average assets	0.88		%	0.81		%	0.71		%
Return on average common equity (GAAP)	6.41		%	6.17		%	4.26		%
Add: Effect of intangibles	3.24			2.87			1.91
Return on average tangible common equity (Non-GAAP)	9.65		%	9.04		%	6.17		%
Efficiency ratio (GAAP)	70.6		%	74.7		%	84.5		%
Effect of tax benefit related to tax-exempt income	(1.0		)	(1.3		)%	(1.6		)
Efficiency ratio (TE) (Non-GAAP)	69.6		%	73.4		%	82.9		%
Effect of amortization of intangibles	(1.0		)	(0.9		)	(0.9		)

46

Effect of non-operating items	(4.1		)	(4.1		)	(7.5		)
Tangible operating efficiency ratio (TE) (Non-GAAP)	64.5		%	68.4		%	74.5		%
Cash Yield:
Earning assets average balance (GAAP)	$	16,652,051		$	13,235,541		$	11,735,392
Add: Adjustments	82,641			36,620			(51,008		)
Earning assets average balance, as adjusted (Non-GAAP)	$	16,734,692		$	13,272,161		$	11,684,384
Net interest income (GAAP)	$	587,758		$	460,111		$	390,244
Add: Adjustments	(36,248		)	(12,371		)	(11,092		)
Net interest income, as adjusted (Non-GAAP)	$	551,510		$	447,740		$	379,152
Yield, as reported	3.55		%	3.51		%	3.38		%
Add: Adjustments	(0.24		)	(0.10		)	(0.08		)
Yield, as adjusted (Non-GAAP)	3.31		%	3.41		%	3.30		%

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TABLE 33 – QUARTERLY RESULTS OF OPERATIONS AND SELECTED CASH FLOW DATA

	2015
(Dollars in thousands, except per share data)	Fourth Quarter			Third Quarter			Second Quarter			First Quarter
Total interest and dividend income	$	176,651		$	171,077		$	160,545		$	138,585
Total interest expense	15,491			15,960			14,868			12,781
Net interest income	161,160			155,117			145,677			125,804
Provision for loan losses	11,711			5,062			8,790			5,345
Net interest income after provision for loan losses	149,449			150,055			136,887			120,459
Gain on sale of available-for-sale securities	6			280			903			386
Other non-interest income	52,497			57,198			60,610			48,513
Non-interest expense	138,975			144,968			153,209			133,153
Income before income taxes	62,977			62,565			45,191			36,205
Income tax expense	18,570			20,090			14,355			11,079
Net income	$	44,407		$	42,475		$	30,836		$	25,126
Income available to common shareholders	$	44,407		$	42,475		$	30,836		$	25,126
Earnings allocated to unvested restricted stock	(505		)	(492		)	(355		)	(344		)
Earnings allocated to common shareholders	$	43,902		$	41,983		$	30,481		$	24,782
Earnings per share - basic	$	1.08		$	1.04		$	0.79		$	0.75
Earnings per share - diluted	1.08			1.03			0.79			0.75
Cash dividends declared per common share	0.34			0.34			0.34			0.34
	2014
	Fourth Quarter			Third Quarter			Second Quarter			First Quarter
Total interest and dividend income	$	137,276		$	133,793		$	119,514		$	114,232
Total interest expense	12,596			12,042			10,241			9,825
Net interest income	124,680			121,751			109,273			104,407
Provision for loan losses	6,495			5,714			4,748			2,103
Net interest income after provision for loan losses	118,185			116,037			104,525			102,304
Gain on sale of available-for-sale securities	162			582			8			19
Other non-interest income	46,910			46,530			43,753			35,664
Non-interest expense	119,135			120,112			127,132			107,235
Income before income taxes	46,122			43,037			21,154			30,752
Income tax expense	10,186			12,144			4,937			8,416
Net income	$	35,936		$	30,893		$	16,217		$	22,336
Income available to common shareholders	$	35,936		$	30,893		$	16,217		$	22,336
Earnings allocated to unvested restricted stock	(523		)	(462		)	(250		)	(402		)
Earnings allocated to common shareholders	$	35,413		$	30,431		$	15,967		$	21,934
Earnings per share - basic	$	1.08		$	0.93		$	0.53		$	0.75
Earnings per share - diluted	1.07			0.92			0.53			0.75
Cash dividends declared per common share	0.34			0.34			0.34			0.34

48

Glossary of Defined Terms

Term	Definition
ACL	Allowance for credit losses
Acquired loans	Loans acquired in a business combination
AFS	Securities available-for-sale
ALL	Allowance for loan and lease losses
AOCI	Accumulated other comprehensive income (loss)
ASC	Accounting Standards Codification
ASU	Accounting Standards Update
Basel III	Global regulatory standards on bank capital adequacy and liquidity published by the BCBS
BCBS	Basel Committee on Banking Supervision
Cameron	Cameron Bancshares, Inc.
CDE	IBERIA CDE, LLC
CFPB	Consumer Financial Protection Bureau
CSB	CapitalSouth Bank
Company	IBERIABANK Corporation and Subsidiaries
Covered Loans	Acquired loans with loss protection provided by the FDIC
Dodd-Frank Act	Dodd-Frank Wall Street Reform and Consumer Protection Act
EPS	Earnings per common share
FASB	Financial Accounting Standards Board
FDIC	Federal Deposit Insurance Corporation
First Private	First Private Holdings, Inc
FHLB	Federal Home Loan Bank
Florida Bank Group	Florida Bank Group, Inc
Florida Gulf	Florida Gulf Bancorp, Inc.
FRB	Board of Governors of the Federal Reserve System
GAAP	Accounting principles generally accepted in the United States of America
Georgia Commerce	Georgia Commerce Bancshares, Inc.
GSE	Government-sponsored enterprises
HTM	Securities held-to-maturity
IAM	IBERIA Asset Management, Inc.
ICP	IBERIA Capital Partners, LLC
IMC	IBERIABANK Mortgage Company
Legacy loans	Loans that were originated directly by the Company
LIBOR	London Interbank Borrowing Offered Rate
LIHTC	Low-income housing tax credit
LTC	Lenders Title Company
MSA	Metropolitan statistical area
Old Florida	Old Florida Bancshares, Inc.
OMNI	OMNI BANCSHARES, Inc.
OCI	Other Comprehensive Income
OREO	Other real estate owned
OTTI	Other than temporary impairment
Parent	IBERIABANK Corporation
RRP	Recognition and Retention Plan
RULC	Reserve for unfunded lending commitments

49

SEC	Securities and Exchange Commission
TE	Fully taxable equivalent
Teche	Teche Holding Company
TDR	Troubled debt restructuring
Trust One-Memphis	Trust One Bank (Memphis Operations)
U.S.	United States of America

50

MANAGEMENT REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

To the Board of Directors of

IBERIABANK Corporation

The management of IBERIABANK Corporation (the “Company”) is responsible for establishing and maintaining effective internal control over financial reporting. The Company’s internal control system was designed to provide reasonable assurance to the Company’s management and Board of Directors regarding the preparation and fair presentation of the Company’s financial statements for external purposes in accordance with U.S. generally accepted accounting principles. Internal control over financial reporting includes self-monitoring mechanisms, and actions are taken to correct deficiencies as they are identified.

All internal control systems, no matter how well designed, have inherent limitations and may not prevent or detect misstatements in the Company’s financial statements, including the possibility of circumvention or overriding of controls. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of a change in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

The Company’s management assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2015. In making this assessment, it used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control—Integrated Framework (2013 Framework). Based on its assessment, management believes that, as of December 31, 2015, the Company’s internal control over financial reporting is effective based on those criteria.

The Company’s independent registered public accounting firm has also issued an attestation report on the effectiveness of the Company’s internal control over financial reporting as of December 31, 2015.

/s/ Daryl G. Byrd	/s/ Anthony J. Restel
Daryl G. Byrd	Anthony J. Restel
President and Chief Executive Officer	Senior Executive Vice President and Chief Financial Officer

51

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

IBERIABANK Corporation and subsidiaries

We have audited IBERIABANK Corporation and subsidiaries’ internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). IBERIABANK Corporation and subsidiaries' management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, IBERIABANK Corporation and subsidiaries maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of IBERIABANK Corporation and subsidiaries as of December 31, 2015 and 2014, and the related consolidated statements of comprehensive income, shareholders’ equity, and cash flows for each of the three years in the period ended December 31, 2015 and our report dated February 29, 2016, expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

New Orleans, Louisiana

February 29, 2016

52

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

IBERIABANK Corporation and subsidiaries

We have audited the accompanying consolidated balance sheets of IBERIABANK Corporation and subsidiaries as of December 31, 2015 and 2014, and the related consolidated statements of comprehensive income, shareholders’ equity, and cash flows for each of the three years in the period ended December 31, 2015. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of IBERIABANK Corporation and subsidiaries at December 31, 2015 and 2014, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2015 in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), IBERIABANK Corporation and subsidiaries’ internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 29, 2016, expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

New Orleans, Louisiana

February 29, 2016

53

IBERIABANK CORPORATION AND SUBSIDIARIES

Consolidated Balance Sheets

	December 31,
(Dollars in thousands, except share data)	2015			2014
Assets
Cash and due from banks	$	241,650		$	251,994
Interest-bearing deposits in banks	268,617			296,101
Total cash and cash equivalents	510,267			548,095
Securities available for sale, at fair value	2,800,286			2,158,853
Securities held to maturity (fair values of $100,961 and $119,481, respectively)	98,928			116,960
Mortgage loans held for sale ($166,247 and $139,950 recorded at fair value, respectively)	166,247			140,072
Loans covered by loss share agreements	229,217			444,544
Non-covered loans, net of unearned income	14,098,211			10,996,500
Total loans, net of unearned income	14,327,428			11,441,044
Allowance for loan losses	(138,378		)	(130,131		)
Loans, net	14,189,050			11,310,913
FDIC loss share receivables	39,878			69,627
Premises and equipment, net	323,902			307,159
Goodwill	724,603			517,526
Other assets	650,907			588,699
Total Assets	$	19,504,068		$	15,757,904
Liabilities
Deposits:
Non-interest-bearing	$	4,352,229		$	3,195,430
Interest-bearing	11,826,519			9,325,095
Total deposits	16,178,748			12,520,525
Short-term borrowings	326,617			845,742
Long-term debt	340,447			403,254
Other liabilities	159,421			136,235
Total Liabilities	17,005,233			13,905,756
Shareholders’ Equity
Preferred stock, $1 par value - 5,000,000 shares authorized
Non-cumulative perpetual, liquidation preference $10,000 per share; 8,000 shares and 0 shares issued and outstanding, respectively, including related surplus	76,812			—
Common stock, $1 par value - 100,000,000 and 50,000,000 shares authorized, respectively; 41,139,537 issued and outstanding and 35,262,901 shares issued, respectively	41,140			35,263
Additional paid-in capital	1,797,982			1,398,633
Retained earnings	584,486			496,573
Accumulated other comprehensive income (loss)	(1,585		)	7,525
Treasury stock at cost - 0 and 1,809,497 shares, respectively	—			(85,846		)
Total Shareholders’ Equity	2,498,835			1,852,148
Total Liabilities and Shareholders’ Equity	$	19,504,068		$	15,757,904

The accompanying Notes are an integral part of these Consolidated Financial Statements.

54

IBERIABANK CORPORATION AND SUBSIDIARIES

Consolidated Statements of Comprehensive Income

	Year Ended December 31,
(Dollars in thousands, except per share data)	2015			2014			2013
Interest and Dividend Income
Loans, including fees	$	606,966		$	526,706		$	488,936
Mortgage loans held for sale, including fees	6,164			5,153			5,108
Investment securities:
Taxable interest	47,380			38,815			31,562
Tax-exempt interest	5,785			5,862			6,668
Amortization of FDIC loss share receivable	(23,500		)	(74,617		)	(97,849		)
Other	4,063			2,896			2,772
Total interest and dividend income	646,858			504,815			437,197
Interest Expense
Deposits:
NOW and MMDA	27,226			18,483			18,933
Savings	740			325			309
Time deposits	19,137			14,282			16,604
Short-term borrowings	797			1,364			490
Long-term debt	11,200			10,250			10,617
Total interest expense	59,100			44,704			46,953
Net interest income	587,758			460,111			390,244
Provision for loan losses	30,908			19,060			5,145
Net interest income after provision for loan losses	556,850			441,051			385,099
Non-interest Income
Mortgage income	81,122			51,797			64,197
Service charges on deposit accounts	42,197			35,573			28,871
Title revenue	22,837			20,492			20,526
Broker commissions	17,592			18,783			16,333
ATM/debit card fee income	13,989			12,023			9,510
Income from bank owned life insurance	4,356			5,473			3,647
Gain on sale of available for sale securities	1,575			771			2,277
Other non-interest income	36,725			28,716			23,597
Total non-interest income	220,393			173,628			168,958
Non-interest Expense
Salaries and employee benefits	322,586			259,086			244,984
Net occupancy and equipment	68,541			59,571			58,037
Impairment of FDIC loss share receivables and other long-lived assets	6,954			6,437			37,893
Communication and delivery	13,506			12,029			12,024
Marketing and business development	13,176			11,707			10,143
Data processing	34,424			27,249			17,853
Amortization of acquisition intangibles	7,811			5,807			4,720
Professional services	22,368			18,975			18,217
Costs of OREO property, net	748			2,748			1,943
Credit and other loan related expense	16,653			13,692			15,853
Insurance	16,670			14,359			11,272
Travel and entertainment	9,525			9,033			8,126
Other non-interest expense	37,343			32,921			31,731
Total non-interest expense	570,305			473,614			472,796
Income before income tax expense	206,938			141,065			81,261
Income tax expense	64,094			35,683			16,133
Net Income	$	142,844		$	105,382		$	65,128
Income Available to Common Shareholders - Basic	$	142,844		$	105,382		$	65,128
Earnings Allocated to Unvested Restricted Stock	(1,680		)	(1,651		)	(1,205		)
Earnings Allocated to Common Shareholders	$	141,164		$	103,731		$	63,923
Earnings per common share - Basic	$	3.69		$	3.31		$	2.20
Earnings per common share - Diluted	3.68			3.30			2.20
Cash dividends declared per common share	1.36			1.36			1.36

55

Comprehensive Income
Net Income	$	142,844		$	105,382		$	65,128
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period (net of tax effects of $4,374, $13,202, and $21,733, respectively)	(8,124		)	24,517			(40,362		)
Reclassification adjustment for gains included in net income (net of tax effects of $551, $270 and $797, respectively)	(1,024		)	(501		)	(1,480		)
Unrealized gains (losses) on securities, net of tax	(9,148		)	24,016			(41,842		)
Fair value of derivative instruments designated as cash flow hedges:
Change in fair value of derivative instruments designated as cash flow hedges during the period (net of tax effects of $20, $0 and $334, respectively)	38			—			619
Reclassification adjustment for losses included in net income (net of tax effects of $0, $0 and $136, respectively)	—			—			255
Fair value of derivative instruments designated as cash flow hedges, net of tax	38			—			874
Other comprehensive income (loss), net of tax	(9,110		)	24,016			(40,968		)
Comprehensive income	$	133,734		$	129,398		$	24,160

The accompanying Notes are an integral part of these Consolidated Financial Statements.

56

IBERIABANK CORPORATION AND SUBSIDIARIES

Consolidated Statements of Shareholders’ Equity

	Preferred Stock			Common Stock
(Dollars in thousands, except share and per share data)	Shares	Amount		Shares		Amount			Additional Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock at Cost			Total
Balance, December 31, 2012	—	$	—	31,917,385		$	31,917		$	1,176,180		$	410,814		$	24,477		$	(114,178	)	$	1,529,210
Net income	—	—		—		—			—			65,128			—			—			65,128
Other comprehensive loss	—	—		—		—			—			—			(40,968		)	—			(40,968		)
Cash dividends declared, $1.36 per share	—	—		—		—			—			(40,434		)	—			—			(40,434		)
Reissuance of treasury stock under incentive plans, net of shares surrendered in payment, including tax benefit	—	—		—		—			(607		)	—			—			7,314			6,707
Treasury stock issued for recognition and retention plans	—	—		—		—			(7,992		)	—			—			7,992			—
Share-based compensation cost	—	—		—		—			10,703			—			—			—			10,703
Balance, December 31, 2013	—	$	—	31,917,385		$	31,917		$	1,178,284		$	435,508		$	(16,491	)	$	(98,872	)	$	1,530,346
Net income	—	—		—		—			—			105,382			—			—			105,382
Other comprehensive income	—	—		—		—			—			—			24,016			—			24,016
Cash dividends declared, $1.36 per share	—	—		—		—			—			(44,317		)	—			—			(44,317		)
Reissuance of treasury stock under incentive plans, net of shares surrendered in payment, including tax benefit	—	—		—		—			3,242			—			—			6,829			10,071
Common stock issued for acquisitions	—	—		3,345,516		3,346			211,319			—			—			—			214,665
Treasury stock issued for recognition and retention plans	—	—		—		—			(6,197		)	—			—			6,197			—
Share-based compensation cost	—	—		—		—			11,985			—			—			—			11,985
Balance, December 31, 2014	—	$	—	35,262,901		$	35,263		$	1,398,633		$	496,573		$	7,525		$	(85,846	)	$	1,852,148
Net income	—	—		—		—			—			142,844			—			—			142,844
Other comprehensive loss	—	—		—		—			—			—			(9,110		)	—			(9,110		)
Cash dividends declared, $1.36 per share	—	—		—		—			—			(54,931		)	—			—			(54,931		)
Reclassification of treasury stock under the LBCA (1)	—	—		(1,809,497	)	(1,809		)	(84,037		)	—			—			85,846			—
Common stock issued under incentive plans, net of shares surrendered in payment, including tax benefit	—	—		211,729		212			2,201			—			—			—			2,413
Common stock issued for acquisitions	—	—		7,474,404		7,474			467,279			—			—			—			474,753
Preferred stock issued	8,000	76,812		—		—			—			—			—			—			76,812
Share-based compensation cost	—	—		—		—			13,906			—			—			—			13,906
Balance, December 31, 2015	8,000	$	76,812	41,139,537		$	41,140		$	1,797,982		$	584,486		$	(1,585	)	$	—		$	2,498,835

(1) Effective January 1, 2015, companies incorporated in Louisiana became subject to the Louisiana Business Corporation Act (“LBCA”), which eliminates the concept of treasury stock and provides that shares reacquired by a company are to be treated as authorized but unissued. Refer to Note 1 for further discussion.

The accompanying Notes are an integral part of these Consolidated Financial Statements.

57

58

IBERIABANK CORPORATION AND SUBSIDIARIES

Consolidated Statements of Cash Flows

	Year Ended December 31,
(Dollars in thousands)	2015			2014			2013
Cash Flows from Operating Activities
Net income	$	142,844		$	105,382		$	65,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	(6,178		)	23,327			19,423
Provision for loan losses	30,908			19,060			5,145
Share-based compensation cost	13,906			11,985			10,703
Gain on sale of assets, net	(2,539		)	(14		)	(251		)
Gain on sale of securities available for sale	(1,575		)	(771		)	(2,277		)
Gain on sale of OREO, net	(5,552		)	(4,221		)	(6,022		)
Impairment of FDIC loss share receivables and other long-lived assets	6,954			6,437			37,893
Amortization of premium/discount on securities, net	18,195			13,793			18,953
Expense (benefit) for deferred income taxes	4,551			(25,027		)	(35,930		)
Originations of mortgage loans held for sale	(2,464,588		)	(1,675,538		)	(2,116,460		)
Proceeds from sales of mortgage loans held for sale	2,516,110			1,716,565			2,320,885
Gain on sale of mortgage loans held for sale, net	(83,131		)	(59,156		)	(65,393		)
Tax benefit associated with share-based payment arrangements	(580		)	(2,105		)	(886		)
Change in other assets, net of other assets acquired	13,925			11,770			(17,559		)
Other operating activities, net	12,873			(22,124		)	76,431
Net Cash Provided by Operating Activities	196,123			119,363			309,783
Cash Flows from Investing Activities
Proceeds from sales of securities available for sale	228,604			61,702			44,677
Proceeds from maturities, prepayments and calls of securities available for sale	473,142			488,699			709,977
Purchases of securities available for sale	(1,063,460		)	(703,179		)	(1,026,290		)
Proceeds from maturities, prepayments and calls of securities held to maturity	22,939			36,182			55,706
Purchases of securities held to maturity	(5,833		)	—			(5,901		)
Reimbursement of recoverable covered asset losses (to) from the FDIC	(932		)	5,734			68,233
Increase in loans, net of loans acquired	(703,946		)	(824,437		)	(1,030,545		)
Proceeds from sale of premises and equipment	13,309			5,129			8,714
Purchases of premises and equipment, net of premises and equipment acquired	(19,502		)	(29,841		)	(16,941		)
Proceeds from disposition of OREO	55,025			84,429			116,612
Cash paid for additional investment in tax credit entities	(9,671		)	(13,191		)	(2,213		)
Cash received in excess of cash paid for acquisitions	425,581			188,803			—
Other investing activities, net	13,772			(12,785		)	(2,636		)
Net Cash Used in Investing Activities	(570,972		)	(712,755		)	(1,080,607		)
Cash Flows from Financing Activities
Increase (decrease) in deposits, net of deposits acquired	968,746			641,026			(10,689		)
Net change in short-term borrowings, net of borrowings acquired	(520,653		)	110,298			377,299
Proceeds from long-term debt	63,198			54,637			2,867
Repayments of long-term debt	(201,259		)	(22,871		)	(144,609		)
Cash dividends paid on common stock	(52,318		)	(43,070		)	(40,332		)
Proceeds from common stock transactions	5,535			11,693			8,101
Payments to repurchase common stock	(3,620		)	(3,727		)	(2,280		)
Net proceeds from issuance of preferred stock	76,812			—			—

59

Tax benefit associated with share-based payment arrangements	580			2,105		886
Net Cash Provided by Financing Activities	337,021			750,091		191,243
Net (Decrease) Increase In Cash and Cash Equivalents	(37,828		)	156,699		(579,581		)
Cash and Cash Equivalents at Beginning of Period	548,095			391,396		970,977
Cash and Cash Equivalents at End of Period	$	510,267		$	548,095	$	391,396
Supplemental Schedule of Non-cash Activities
Acquisition of real estate in settlement of loans	$	21,690		$	27,050	$	93,040
Common stock issued in acquisitions	$	474,753		$	214,665	$	—
Supplemental Disclosures
Cash paid for:
Interest on deposits and borrowings	$	58,556		$	43,210	$	47,466
Income taxes, net	$	53,476		$	52,094	$	29,063

The accompanying Notes are an integral part of these Consolidated Financial Statements.

60

IBERIABANK CORPORATION AND SUBSIDIARIES

Notes to Consolidated Financial Statements

NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

GENERAL

The accompanying consolidated financial statements have been prepared in accordance with GAAP and practices generally accepted in the banking industry. The consolidated financial statements include the accounts of the Company and its subsidiaries.

When we refer to the “Company,” “we,” “our,” or “us” in this Report, we mean IBERIABANK Corporation and subsidiaries (consolidated). When we refer to the “Parent,” we mean IBERIABANK Corporation. See the Glossary of Acronyms at the end of this Report for terms used throughout this Report.

Reclassification

Certain amounts reported in prior periods have been reclassified to conform to the current period presentation. These reclassifications did not have a material effect on previously reported consolidated financial statements.

PRINCIPLES OF CONSOLIDATION

The Company’s consolidated financial statements include all entities in which the Company has a controlling financial interest under either the voting interest or variable interest model. The assessment of whether or not the Company has a controlling interest (i.e., the primary beneficiary) in a VIE is performed on an on-going basis. All equity investments in non-consolidated VIEs are included in "other assets" in the Company’s consolidated balance sheets. The Company’s maximum exposure to loss as a result of its involvement with non-consolidated VIEs was approximately $160 million and $151 million at December 31, 2015 and 2014, respectively. The Company's maximum exposure to loss was equivalent to the carrying value of its investments and any related outstanding loans to the non-consolidated VIEs.

Investments in entities that are not consolidated are accounted for under either the equity, cost, or proportional amortization method of accounting. Investments for which the Company has the ability to exercise significant influence over the operating and financing decisions of the entity are accounted for under the equity method. Investments for which the Company does not hold such ability are accounted for under the cost method. Investments in qualified affordable housing projects, which meet certain criteria, are accounted for under the proportional amortization method.

The consolidated financial statements include the accounts of the Company and its subsidiaries, IBERIABANK; Lenders Title Company; IBERIA Capital Partners, LLC; 1887 Leasing, LLC; IBERIA Asset Management, Inc.; 840 Denning, LLC; and IBERIA CDE, LLC. All significant intercompany balances and transactions have been eliminated in consolidation. All normal, recurring adjustments which, in the opinion of management, are necessary for a fair presentation of the financial statements have been included.

NATURE OF OPERATIONS

The Company offers commercial and retail banking products and services to customers throughout locations in seven states through IBERIABANK. The Company also operates mortgage production offices in 10 states through IMC and offers a full line of title insurance and closing services throughout Arkansas and Louisiana through LTC and its subsidiaries. ICP provides equity research, institutional sales and trading, and corporate finance services throughout the energy industry. 1887 Leasing, LLC owns an aircraft used by management of the Company. IAM provides wealth management and trust services for commercial and private banking clients. CDE is engaged in the purchase of tax credits.

USE OF ESTIMATES

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Material estimates that are susceptible to significant change in the near term are the allowance for credit losses, valuation of and accounting for acquired loans, goodwill and other intangibles, and income taxes.

CONCENTRATION OF CREDIT RISKS

Most of the Company’s business activity is with customers located within the states of Louisiana, Florida, Arkansas, Alabama, Texas, Georgia, and Tennessee. The Company’s lending activity is concentrated in its market areas in those states. The Company has emphasized originations of commercial loans and private banking loans, defined as loans to larger consumer

61

clients. Repayments on loans are expected to come from cash flows of the borrower and/or guarantor. Losses on secured loans are limited by the value of the collateral upon default of the borrowers and guarantor support. The Company does not have any significant concentrations to any one industry or customer.

BUSINESS COMBINATIONS

Assets and liabilities acquired in business combinations are recorded at their acquisition date fair values. In accordance with ASC Topic 805, Business Combinations, the Company generally records provisional amounts at the time of acquisition based on the information available to the Company. The provisional estimates of fair values may be adjusted for a period of up to one year (“measurement period”) from the date of acquisition if new information obtained about facts and circumstances that existed as of the acquisition date, if known, would have affected the measurement of the amounts recognized as of that date. Subsequent to the Company's early adoption of ASU No. 2015-16 during the third quarter of 2015, adjustments recorded during the measurement period are recognized in the current reporting period.

Loans generally represent a significant portion of the assets acquired in the Company’s business acquisitions. If the Company discovers that it has materially underestimated the credit losses expected in the loan portfolio based on information available at the acquisition date within the measurement period, it will reduce or eliminate the gain and/or increase goodwill recorded on the acquisition in the period the adjustment is recorded. If the Company determines that losses arose subsequent to acquisition date, such losses are reflected as a provision for credit losses.

CASH AND CASH EQUIVALENTS

For purposes of presentation in the consolidated statements of cash flows, cash and cash equivalents are defined as cash, interest-bearing deposits, and non-interest-bearing demand deposits at other financial institutions with original maturities less than three months. IBERIABANK may be required to maintain average balances on hand or with the Federal Reserve Bank to meet regulatory reserve and clearing requirements. At December 31, 2015 and 2014, IBERIABANK had sufficient cash deposited with the Federal Reserve Bank to cover the required reserve balance.

INVESTMENT SECURITIES

Management determines the appropriate accounting classification of debt and equity securities at the time of acquisition and re-evaluates such designations at least quarterly. Debt securities that management has the ability and intent to hold to maturity are classified as HTM and carried at cost, adjusted for amortization of premiums and accretion of discounts using methods approximating the interest method. Securities acquired with the intention of recognizing short-term profits or which are actively bought and sold are classified as trading securities and reported at fair value, with unrealized gains and losses recognized in earnings. Securities not classified as HTM or trading, including equity securities with readily determinable fair values, are classified as AFS and recorded at fair value, with unrealized gains and losses excluded from earnings and reported in AOCI. Credit-related declines in the fair value of debt and marketable equity securities that are considered OTTI are recorded in earnings.

The Company evaluates its investment securities portfolio on a quarterly basis for indicators of OTTI. Declines in the fair value of individual HTM and AFS securities below their amortized cost basis are reviewed to determine whether the declines are other than temporary. In estimating OTTI losses, management considers 1) the length of time and the extent to which the fair value has been less than the amortized cost basis, 2) the financial condition and near-term prospects of the issuer, 3) its intent to sell and whether it is more likely than not that the Company would be required to sell those securities before the anticipated recovery of the amortized cost basis, and 4) for debt securities, the recovery of contractual principal and interest.

For securities that the Company does not expect to sell, or it is not more likely than not it will be required to sell prior to recovery of its amortized cost basis, the credit component of an OTTI is recognized in earnings and the non-credit component is recognized in AOCI. For securities that the Company does expect to sell, or it is more likely than not that it will be required to sell prior to recovery of its amortized cost basis, both the credit and non-credit component of an OTTI are recognized in earnings. Subsequent to recognition of OTTI, an increase in expected cash flows is recognized as a yield adjustment over the remaining expected life of the security based on an evaluation of the nature of the increase.

Nonmarketable equity securities include stock acquired for regulatory purposes, such as Federal Home Loan Bank stock and Federal Reserve Bank stock. These securities are accounted for at amortized cost, evaluated for impairment at least quarterly, and included in "other assets".

Gains or losses on securities sold are recorded on the trade date, using the specific identification method.

62

LOANS HELD FOR SALE

Loans and loan commitments which the Company does not have the intent and ability to hold for the foreseeable future or until maturity or payoff are classified as loans held for sale at the time of origination or acquisition. Subsequent to origination or acquisition, if the Company no longer has the intent or ability to hold a loan for the foreseeable future, generally a decision has been made to sell the loan, and it is classified within loans held for sale. Unless the fair value option has been elected at origination or acquisition, loans classified as held for sale are carried at the lower of cost or fair value. Amortization/accretion of remaining unamortized net deferred loan fees or costs and discounts or premiums (if applicable) ceases when a loan is classified as held for sale.

Loans held for sale primarily consist of fixed rate single-family residential mortgage loans originated and under contract to be sold in the secondary market. Mortgage loans originated and held for sale are recorded at fair value under the fair value option, unless otherwise noted. For mortgage loans for which the Company has elected the fair value option, gains and losses are included in mortgage income. For any other loans held for sale, net unrealized losses, if any, are recognized through a valuation allowance that is recorded as a charge to non-interest income. See Note 20 for further discussion of the determination of fair value for loans held for sale. In most cases, loans in this category are sold within thirty days and are generally sold with the mortgage servicing rights released. Buyers generally have recourse to return a purchased loan or request reimbursement for the loan premium or servicing rights under limited circumstances. Recourse conditions may include prepayment, payment default, breach of representations or warranties, and documentation deficiencies. During 2015 and 2014, an insignificant number of loans were returned to the Company. At December 31, 2015 and 2014, the recorded repurchase liability associated with transferred loans was immaterial.

LOANS

Legacy (Loans originated by the Company)

The Company originates mortgage, commercial, and consumer loans for customers. Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the unpaid principal balances, less the ALL, charge-offs, and unamortized net loan origination fees and direct costs, except for loans which are carried at fair value. Interest income is accrued as earned over the term of the loans based on the principal balance outstanding. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield.

Acquired (Loans acquired through Business Combinations)

Acquired loans are recorded at fair value on the acquisition date in accordance with ASC Topic 820, Fair Value Measurement, consistent with the exit price concept on the date of acquisition. Credit risk assumptions and any resulting credit discounts are included in the determination of fair value. Therefore, an ACL is not recorded at the acquisition date. The determination of fair value includes estimates related to discount rates, expected prepayments, and the amount and timing of undiscounted expected principal, interest, and other cash flows.

Acquired loans are evaluated at acquisition and classified as purchased impaired (“acquired impaired”) or purchased non-impaired (“acquired non-impaired”). Purchased impaired loans reflect credit deterioration since origination to the extent that it is probable at the time of acquisition that the Company will be unable to collect all contractually required payments. At the time of acquisition, purchased impaired loans are accounted for individually or aggregated into loan pools with similar characteristics, which include:

• whether the loan is performing according to contractual terms at the time of acquisition,

• the loan type based on regulatory reporting guidelines, namely whether the loan was a mortgage, consumer, or commercial loan,

• the nature of collateral,

• the interest rate type, whether fixed or variable rate, and

• the loan payment type, primarily whether the loan is amortizing or interest-only.

From these pools, the Company uses certain loan information, including outstanding principal balance, estimated expected losses, weighted average maturity, weighted average term to re-price (if a variable rate loan), weighted average margin, and weighted average interest rate to estimate the expected cash flow for each loan pool.

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For purchased impaired loans, expected cash flows at the acquisition date in excess of the fair value of loans are recorded as interest income over the life of the loans using a level yield method if the timing and amount of future cash flows is reasonably estimable. For purchased non-impaired loans, the difference between the fair value and unpaid principal balance of the loan at acquisition, referred to as a purchase premium or discount, is amortized or accreted to income over the estimated life of the loans as an adjustment to yield.

Subsequent to acquisition, the Company performs cash flow re-estimations at least quarterly for each purchased impaired loan and/or loan pool. Increases in estimated cash flows above those expected at acquisition are recognized on a prospective basis as interest income over the remaining life of the loan and/or pool. Decreases in expected cash flows subsequent to acquisition generally result in recognition of a provision for credit loss. The measurement of cash flows involves several assumptions and judgments (i.e., prepayments, default rates, loss severity, etc.). All of these factors are inherently subjective and significant changes in the cash flow estimations can result over the life of the loan.

Classification

The Company’s loan portfolio is disaggregated into portfolio segments for purposes of determining the ACL. The Company’s portfolio segments include commercial, residential mortgage, and consumer and other loans, bifurcated between legacy and acquired. The Company further disaggregates each commercial, residential mortgage, and consumer and other loans portfolio segment into classes for purposes of monitoring and assessing credit quality based on certain risk characteristics. Classes within the commercial loan portfolio segment include commercial real estate-construction, commercial real estate-other, commercial and industrial, and energy-related. Classes within the consumer and other loans portfolio segment include home equity, indirect automobile, credit card, and consumer-other.

Troubled Debt Restructurings

The Company periodically grants concessions to its customers in an attempt to protect as much of its investment as possible and minimize risk of loss. These concessions may include restructuring the terms of a loan to alleviate the burden of the customer’s near-term cash requirements. In order to be classified a TDR, the Company must conclude that the restructuring constitutes a concession and the customer is experiencing financial difficulties. The Company defines a concession to the customer as a modification of existing terms for economic or legal reasons that it would otherwise not consider. The concession is either granted through an agreement with the customer or is imposed by a court or law. Concessions include modifying original loan terms to reduce or defer cash payments required as part of the loan agreement, including but not limited to:

• a reduction of the stated interest rate for the remaining original life of the loan,

• extension of the maturity date or dates at a stated interest rate lower than the current market rate for new loans with similar risk characteristics,

• reduction of the face amount or maturity amount of the loan as stated in the agreement, or

• reduction of accrued interest receivable on the loan.

In its determination of whether the customer is experiencing financial difficulties, the Company considers numerous indicators, including, but not limited to:

• whether the customer is currently in default on its existing loan(s), or is in an economic position where it is probable the customer will be in default on its loan(s) in the foreseeable future without a modification,

• whether the customer has declared or is in the process of declaring bankruptcy,

• whether there is substantial doubt about the customer’s ability to continue as a going concern,

• whether, based on its projections of the customer’s current capabilities, the Company believes the customer’s future cash flows will be insufficient to service the loan, including interest, in accordance with the contractual terms of the existing agreement for the foreseeable future, and

• whether, without modification, the customer cannot obtain sufficient funds from other sources at an effective interest rate equal to the current market rate for a similar loan for a non-troubled debtor.

If the Company concludes that both a concession has been granted and the customer is experiencing financial difficulties, the Company identifies the loan as a TDR. All TDRs are considered impaired loans.

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NON-ACCRUAL AND PAST DUE LOANS (INCLUDING LOAN CHARGE-OFFS)

Loans are considered past due when contractual payments of principal and interest have not been received within 30 days from the contractual due date.

All legacy and purchased non-impaired loans are placed on non-accrual status when collection of principal or interest is in doubt. Purchased impaired loans are placed on non-accrual status when the Company cannot reasonably estimate cash flows on a loan or loan pool. Legacy and purchased non-impaired loans are evaluated for potential charge-off in accordance with the parameters discussed in the following paragraph or when the loan is placed on non-accrual status, whichever is earlier.

Loans within the commercial portfolio (except for purchased impaired) are generally evaluated for charge-off at 90 days past due, unless both well-secured and in the process of collection. Closed and open-end residential mortgage and consumer loans (except for purchased impaired) are evaluated for charge-off no later than 120 days past due. Any outstanding loan balance in excess of the fair value of the collateral less costs to sell is charged-off no later than 120 days past due for loans secured by real estate. For non-real estate secured loans, in lieu of charging off the entire loan balance, loans may be written down to the fair value of the collateral less costs to sell if repossession of collateral is assured and in process. 

The accrual of interest, as well as the amortization/accretion of any remaining unamortized net deferred fees or costs and discount or premium, is discontinued at the time the loan is placed on non-accrual status. All accrued but uncollected interest for loans that are placed on non-accrual status is reversed, with current year accruals charged to interest income and prior year amounts charged-off as a credit loss. Cash receipts received on non-accrual loans are generally applied against principal until the loan has been collected in full, after which time any additional cash receipts are recognized as interest income (i.e., cost recovery method). However, interest may be accounted for under the cash-basis method as long as the remaining recorded investment in the loan is deemed fully collectible.

Loans are returned to accrual status when the borrower has demonstrated a capacity to continue payment of the debt and collection of contractually required principal and interest associated with the debt is reasonably assured. At such time, the accrual of interest and amortization/accretion of any remaining unamortized net deferred fees or costs and discount or premium shall resume. Any interest income which was applied to the principal balance shall not be reversed and subsequently will be recognized as an adjustment to yield over the remaining life of the loan.

IMPAIRED LOANS

For all classes within the commercial portfolio, all loans with an outstanding commitment balance above a specific threshold are evaluated on a quarterly basis for potential impairment. Generally, mortgage and consumer loans within any class are not individually evaluated on a regular basis for impairment. All TDRs, regardless of the outstanding balance amount or portfolio classification, and all purchased impaired loans are considered to be impaired.

A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal and/or interest when due, according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Impairment losses are measured on a loan-by-loan basis for commercial and certain mortgage or consumer loans, based on either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent. This measurement requires significant judgment and use of estimates, and the actual loss ultimately recognized by the Company may differ significantly from the estimates.

ALLOWANCE FOR CREDIT LOSSES

The Company maintains the ACL at a level that management believes appropriate to absorb estimated probable credit losses incurred in the loan portfolios (including unfunded commitments) as of the consolidated balance sheet date. The ACL consists of the allowance for loan losses (contra asset) and the reserve for unfunded commitments (liability). The manner in which the ACL is determined is based on 1) the accounting method applied to the underlying loans and 2) whether the loan is required to be measured for impairment in accordance with ASC Topic 450-20, Contingencies - Loss Contingencies or ASC Topic 310-10-35, Receivables - Overall. The Company delineates between loans accounted for under the contractual yield method, legacy and purchased non-impaired loans, and purchased impaired loans (loans accounted for in accordance with ASC Topic 310-30, Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality). Further, for legacy and acquired non-impaired loans, the Company attributes portions of the ACL to loans and loan commitments that it measures individually (ASC Topic 310-10-35, Receivables - Overall), impaired credit, and groups of homogeneous loans and loan commitments that it measures collectively (ASC Topic 450-20, Contingencies - Loss Contingencies).

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Determination of the appropriate ACL involves a high degree of complexity and requires significant judgment regarding the credit quality of the loan portfolio. Several factors are taken into consideration in the determination of the overall ACL, including a qualitative component. These factors include, but are not limited to, the overall risk profiles of the loan portfolios, net charge-off experience, the extent of impaired loans, the level of non-accrual loans, the level of 90 days past due loans, the value of collateral, the ability to monetize guarantor support, and the overall percentage level of the allowance relative to the loan portfolio, amongst other factors. The Company also considers overall asset quality trends, changes in lending practices and procedures, trends in the nature and volume of the loan portfolio, including the existence and effect of any portfolio concentrations, changes in experience and depth of lending staff, the Company’s legal, regulatory and competitive environment, national and regional economic trends, data availability and applicability that might impact the portfolio or the manner in which it estimates losses, and risk rating accuracy and risk identification.

The allowance for loan losses for all impaired loans (excluding purchased impaired) is determined on an individual loan basis, considering the facts and circumstances specific to each borrower. The allowance is based on the difference between the recorded investment in the loan and generally either the estimated net present value of projected cash flows or the estimated value of the collateral associated with the loan, if the loan is deemed collateral-dependent. For non-impaired loans (excluding purchased impaired), the allowance for loan losses is calculated based on pools of loans with similar characteristics. The pool level allowance is calculated through the application of a PD (i.e., probability of default) and LGD (i.e., loss given default) factor for each individual loan. PDs and LGDs are determined based on historical default and loss information for similar loans. For purposes of establishing estimated loss percentages for pools of loans that share common risk characteristics, the Company’s loan portfolio is segmented by various loan characteristics including loan type, risk rating (commercial), Vantage or FICO score (mortgage and consumer), past due status (mortgage and consumer) and call report code. The default and loss information is measured over an appropriate period for each loan pool and adjusted as deemed appropriate. Qualitative adjustments are incorporated into the pool level analysis to accommodate for the imprecision of certain assumptions and uncertainties inherent in the calculation. See the "Loans" section of this Footnote for discussion of the determination of the ACL for purchased impaired loans.

Certain inherent, but unconfirmed losses are probable within the loan portfolio. The Company’s current methodology for determining the level of losses is based on historical loss rates, current credit grades, specific allocation, and other qualitative adjustments. In a stable or deteriorating credit environment, heavy reliance on historical loss rates and the credit grade rating process results in model-derived required reserves that tend to slightly lag behind portfolio deterioration. Similar lags can occur in an improving credit environment whereby required reserves can lag slightly behind portfolio improvement. Given these model limitations, qualitative adjustment factors may be incremental or decremental to the quantitative model results. In periods prior to 2015, the Company estimated incurred losses on its Exploration and Production and its Oil Field Services portfolios as an aggregate portfolio. Beginning in 2015, as the performance of these two portfolios began to diverge, the Company disaggregated the analysis of incurred losses within these portfolios, which included modifying its LGD estimates for the E&P portfolio to more closely align with published industry data. Absent this change, the Company would have recorded an additional $10.0 million, or 17 cents per share, in provision expense for the year ended December 31, 2015. 

The reserve for unfunded commitments is determined using similar methodologies described above for non-impaired loans. The loss factors used in the reserve for unfunded commitments are equivalent to the loss factors used in the allowance for loan losses, while also considering utilization of unused commitments.

FDIC LOSS SHARE RECEIVABLE

The Company entered into arrangements with the FDIC which obligate the FDIC to reimburse the Company for losses on certain loans associated with FDIC-assisted transactions. The indemnification assets were recorded at fair value as of the acquisition dates. The initial values of the indemnification assets were based on estimated cash flows to be received over the expected life of the acquired assets, not to exceed the term of the indemnification agreements. The reimbursable loss periods, excluding single family residential assets, ended in 2014 for three acquisitions, ended during 2015 for one acquisition, and will end during 2016 for two acquisitions. The reimbursable loss periods for single family residential assets will end in 2019 for three acquisitions, in 2020 for one acquisition, and in 2021 for two acquisitions. Assets are covered through expiration of the loss share term, at which point such assets are considered non-covered.

Because the indemnification assets are measured on the same basis as the indemnified (covered) loans, subject to contractual and collectibility limitations, the indemnification assets are impacted by changes in expected cash flows on covered assets. Increases in credit losses expected to occur within the loss share term are generally recorded as current period increases to the ACL and increase the amount collectible from the FDIC by the applicable loss share percentage. Decreases in credit losses expected to occur within the loss share term reduce the amount collectible from the FDIC and increase the amount collectible from customers in the form of prospective accretion on loans. Increases in the portion of indemnification asset collectible from customers are amortized to income. Periodic amortization represents the amount that is expected to result in symmetrical

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recognition of pool-level accretion and amortization over the shorter of 1) the life of the loan or 2) the life of the shared loss agreement.

The Company assesses the indemnification assets for collectibility at the acquisition level based on three sources: 1) the FDIC, 2) OREO transactions, and 3) customers. Amounts collectible from the FDIC through loss reimbursements are comprised of losses currently expected within the loss share term. A current period impairment would be recorded to the extent that events or circumstances indicate that losses previously expected to occur within the loss share term are expected to occur subsequent to loss share termination. Amounts collectible through expected gains on the sale of OREO are written-up or impaired each period based on the best available information.

Loss assumptions used to measure the basis of the indemnified loans are consistent with the loss assumptions used to measure the indemnification assets.

PREMISES AND EQUIPMENT

Land is carried at cost. Buildings, furniture, fixtures, and equipment are carried at cost, less accumulated depreciation computed on a straight-line basis over the estimated useful lives of 10 to 40 years for buildings and 3 to 15 years for furniture, fixtures, and equipment. Leasehold improvements are amortized over the lease term, including any renewal periods that are reasonably assured, or the asset’s useful life, whichever is shorter. Premises and equipment are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.

SOFTWARE

Software is amortized on a straight-line basis over its estimated useful life. The estimated useful life of software is generally three years, but can vary depending on the specific facts and circumstances. Software is evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the software may not be recoverable. Software is recorded within "other assets" on the Company’s consolidated balance sheets with carrying amounts at December 31, 2015 and 2014 of $6.2 million and $7.9 million, respectively.

GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

Goodwill represents the excess of the consideration paid in a business combination over the fair value of the identifiable net assets acquired. Goodwill is not amortized, but is assessed for potential impairment at a reporting unit level on an annual basis, as of October 1^st, or whenever events or changes in circumstances indicate that it is more likely than not the fair value of a reporting unit is less than its respective carrying amount. As part of its testing, the Company may elect to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the results of the qualitative assessment indicate that more likely than not a reporting unit’s fair value is less than its carrying amount, the Company determines the fair value of the respective reporting unit (through the application of various quantitative valuation methodologies) relative to its carrying amount to determine whether quantitative indicators of potential impairment are present (i.e., Step 1). The Company may also elect to bypass the qualitative assessment and begin with Step 1. If the results of Step 1 indicate that the fair value of the reporting unit may be below its carrying amount, the Company determines the fair value of the reporting unit’s assets and liabilities, considering deferred taxes, and then measures impairment loss by comparing the implied fair value of goodwill with the carrying amount of that goodwill (i.e., Step 2).

Title Plant

Costs incurred to construct a title plant, including the costs incurred to obtain, organize, and summarize historical information, are capitalized until the title plant can be used to perform title searches. A purchased title plant, including a purchased undivided interest in a title plant, is recorded at cost at the date of acquisition. For a title plant acquired separately or as part of a company acquisition, cost is measured as the fair value of the consideration given. Capitalized costs of a title plant are not depreciated or charged to income unless circumstances indicate that the carrying amount of the title plant has been impaired. Impairment indicators include a change in legal requirements or statutory practices, identification of obsolescence, or abandonment of the title plant, among other indicators.

Capitalized storage and retrieval costs (e.g., costs to convert from one storage retrieval system to another or to modernize the storage and retrieval systems) incurred after a title plant is operational are charged to expense in a systematic and rational manner. Title plant is recorded within "other assets" on the Company’s consolidated balance sheets.

Intangible assets subject to amortization

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The Company’s acquired intangible assets that are subject to amortization include (amongst other ancillary intangibles described in Note 10) core deposit intangibles, amortized on a straight-line or accelerated basis, and a customer relationship intangible asset, amortized on an accelerated basis, over average lives not to exceed 10 years. The Company reviews intangible assets for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Impairment is identified if the sum of the undiscounted estimated future cash flows is less than the carrying value of the asset.Intangible assets are recorded within "other assets" on the Company’s consolidated balance sheets.

OTHER REAL ESTATE OWNED

Other real estate owned includes all real estate, other than bank premises used in bank operations, owned or controlled by the Company, including real estate acquired in settlement of loans. Properties are initially recognized at the recorded investment of the loan (which is the pro-rata carrying value of loans accounted for in accordance with ASC Topic 310-30, Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality) or at estimated fair value less costs to sell, whichever is less, generally when the Company has received physical possession (legal title is not required for non-consumer residential property). The amount by which the recorded investment of the loan exceeds the fair value less costs to sell of the property is charged to the ALL. Subsequent to foreclosure, the assets are carried at the lower of cost or fair value less costs to sell. Former bank properties transferred to OREO are recorded at the lower of cost or market. Subsequent declines in the fair value of other real estate are recorded as adjustments to the carrying amount through a valuation allowance. Revenue and expenses from operations, gain or loss on sale, and changes in the valuation allowance are included in net expenses from foreclosed assets. The Company included property write-downs of $4.0 million and $3.8 million in earnings for the years ended December 31, 2015 and 2014, respectively. OREO is recorded within "other assets" on the Company’s consolidated balance sheets.

DERIVATIVE FINANCIAL INSTRUMENTS

The Company enters into various derivative financial instruments to manage interest rate risk, asset sensitivity, and other exposures such as liquidity and credit risk, as well as to facilitate customer transactions. The primary types of derivatives utilized by the Company include interest rate swap agreements, interest rate lock commitments, forward sales commitments, and written and purchased options. All derivative instruments are recognized on the consolidated balance sheets as "other assets" or "other liabilities" at fair value, regardless of whether a right of offset exists. Changes in the fair value (i.e., gains or losses) of a derivative instrument are recorded based on whether it has been designated and qualifies as part of a hedging relationship.

To facilitate customer transactions that are entered outside of the Company's risk management strategies, the Company enters into derivative instruments to allow its commercial customers to manage their exposure to interest rate fluctuations or to facilitate business transactions. These derivative instruments, including interest rate swap agreements and foreign exchange contracts, are not designated for hedge accounting (i.e., economic hedges). To mitigate the market risk associated with these customer contracts, the Company enters into offsetting derivative contract positions. The Company manages its credit risk, or potential risk of default, by its commercial customers through credit limit approval and monitoring procedures.

Derivatives Designated in Hedging Relationships

For cash flow hedges, the effective portion of the gain or loss related to the derivative instrument is initially reported as a component of OCI and subsequently reclassified into earnings when the forecasted transaction affects earnings or when the hedge is terminated. The ineffective portion of the gain or loss, if any, is reported in earnings immediately, in either "other income" or "other expense", respectively. In applying hedge accounting for derivatives (ASC Topic 815-30 Derivatives and Hedging - Cash Flow Hedges), the Company establishes and documents a method for assessing the effectiveness of the hedging derivative and a measurement approach for determining the ineffective aspect of the hedge upon the inception of the hedge.

Derivatives Not Designated in Hedging Relationships

For derivative instruments that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately.

Common Types of Derivatives

Interest rate swap agreements

Interest rate swaps are agreements to exchange interest payments based upon notional amounts. The exchange of payments typically involves paying a fixed rate and receiving a variable rate or vice versa.

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As part of its activities to manage interest rate risk (i.e., the exposure to the variability of future cash flows or other forecasted transactions due to fluctuating market rates), the Company enters into interest rate contracts, which typically include interest rate swap agreements. The Company primarily utilizes these instruments, which the Company designates as cash flow hedges, to convert a portion of its variable-rate loans or debt to a fixed rate.

Interest rate lock commitments

The Company enters into commitments to originate mortgage loans intended for sale whereby the interest rate on the prospective loan is determined prior to funding (“rate lock”). A rate lock is provided to a borrower, subject to conditional performance obligations, for a specified period of time that typically does not exceed 60 days. Rate lock commitments on mortgage loans that are intended to be sold are recognized as derivatives. Accordingly, such commitments are recorded at fair value as derivative assets or liabilities, with changes in fair value recorded in mortgage income on the consolidated statements of comprehensive income.

Forward sales commitments

The Company uses forward sales commitments to protect the value of its rate locks and mortgage loans held for sale from changes in interest rates and pricing between the origination of the rate lock and sale of these loans, as changes in interest rates have the potential to cause a decline in value of rate locks and mortgage loans included in the held for sale portfolio. These commitments are recognized as derivatives and recorded at fair value as derivative assets or liabilities, with changes in fair value recorded in mortgage income on the consolidated statements of comprehensive income.

Equity-indexed certificates of deposit

IBERIABANK offers its customers a certificate of deposit that provides the purchaser a guaranteed return of principal at maturity plus a potential return, which allows IBERIABANK to identify a known cost of funds. The rate of return is based on the performance of a group of publicly traded stocks that represent a variety of industry segments. Because it is based on an equity index, the rate of return represents an embedded derivative that is not clearly and closely related to the host instrument and is to be accounted for separately. Accordingly, the certificate of deposit is separated into two components: a zero coupon certificate of deposit (the host instrument) and a written option purchased by the depositor (an embedded derivative). The discount on the zero coupon deposit is amortized over the life of the deposit, and the written option is carried at fair value on the Company’s consolidated balance sheets, with changes in fair value recorded through earnings. IBERIABANK offsets the risks of the written option by purchasing an option with terms that mirror the written option, which is also carried at fair value on the Company’s consolidated balance sheets.

OFF-BALANCE SHEET CREDIT-RELATED FINANCIAL INSTRUMENTS

In the ordinary course of business, the Company executes various commitments to extend credit, including commitments under commercial construction arrangements, commercial and home equity lines of credit, credit card arrangements, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded on the funding date.

TRANSFERS OF FINANCIAL ASSETS

Transfers of financial assets, or portions thereof which meet the definition of a participating interest, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when 1) the assets have been legally isolated from the Company, 2) the transferee obtains the right, free of conditions that constrain it from taking advantage of that right and provide the Company with more than a trivial benefit, to pledge or exchange the transferred assets, and 3) the Company does not maintain effective control over the transferred assets. Should the transfer not satisfy all three criteria, the transaction is recorded as a secured financing.

If the transfer is accounted for as a sale, the transferred assets are derecognized from the Company’s balance sheet and a gain or loss on sale is recognized. If the transfer is accounted for as a secured borrowing, the transferred assets remain on the Company’s balance sheet and the proceeds from the transaction are recognized as a liability.

Mortgage Servicing Rights

The Company recognizes the rights to service mortgage loans as separate assets, which are recorded in "other assets" in the consolidated balance sheets, when purchased or when servicing is contractually separated from the underlying mortgage loans by sale with servicing rights retained.

For loan sales with servicing retained, a servicing right (generally an asset) is recorded at fair value for the right to service the loans sold. All servicing rights are identified by class and subsequently accounted for under the amortization method.

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INCOME TAXES

The Company and all subsidiaries file a consolidated Federal income tax return on a calendar year basis. The Company files income tax returns in the U.S. Federal jurisdiction and various state and local jurisdictions through IBERIABANK Corporation (Parent), IBERIABANK, IMC, LTC, and their subsidiaries. In lieu of Louisiana state income tax, IBERIABANK is subject to the Louisiana bank shares tax, portions of which are included in both "non-interest expense" and "income tax expense" in the Company’s consolidated statements of comprehensive income. With few exceptions, the Company is no longer subject to U.S. federal, state or local income tax examinations for years before 2011.

Deferred income tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the temporary differences between the book and tax bases of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. The measurement of deferred tax assets is reduced, if necessary, by the amount of any tax benefits that, based on available evidence, are not expected to be realized.

The Company recognizes interest and penalties accrued related to unrecognized tax benefits, if applicable, in "non-interest expense".

SHARE-BASED COMPENSATION PLANS

The Company issues stock options, restricted stock awards, restricted share units, performance units, and phantom awards under various plans to directors, officers, and other key employees. Compensation cost for all awards is recognized on a straight-line basis over the requisite service period, which is generally the vesting period, taking into account retirement eligibility. For service awards with graded vesting, the Company recognizes compensation cost on a straight-line basis. The majority of the Company's share-based awards qualify for equity accounting and contain service conditions. Under equity accounting, the fair value of the award is measured at the grant date and not subsequently remeasured.

In accordance with ASC 718 Compensation - Stock Compensation, for awards that contain a market condition, the Company includes the market condition in the determination of the grant date fair value of the award. Compensation cost for an award with a market condition is recognized regardless of whether the market condition is satisfied, assuming the requisite service is met. The Company does not include performance conditions in the determination of the grant date fair value of the award. Compensation cost for an award with a performance condition is not recognized if the performance condition is not satisfied. Phantom awards and performance units, accounted for as liability awards, are remeasured at each reporting period based on their fair value until the date of settlement. Compensation cost for each reporting period until settlement is based on the change (or a portion of the change, depending on the percentage of the requisite service that has been rendered at the reporting date) in the fair value of the phantom award and performance unit for each reporting period.

Compensation expense relating to share-based awards is recognized in net income as part of “salaries and employee benefits” on the consolidated statements of comprehensive income for employees and “professional services” for non-employee directors. The exercise price for the options granted by the Company is not less than the fair market value of the underlying stock at the grant date.

EARNINGS PER COMMON SHARE

Basic earnings per share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflects additional common shares that would have been outstanding if dilutive potential common shares, in the form of stock options or restricted stock units, had been issued, as well as any adjustment to income that would result from the assumed issuance. Participating common shares issued by the Company relate to unvested outstanding restricted stock awards, the earnings allocated to which are used in determining income available to common shareholders under the two-class method. The two-class method allocates earnings for the period between common shareholders and other participating securities holders. The participating awards receiving dividends are allocated the same percentage of income as if they were outstanding shares.

SHARE REPURCHASES

Repurchases of the Company’s common stock are recorded at cost.

Effective January 1, 2015, companies incorporated in Louisiana became subject to the Louisiana Business Corporation Act (which replaced the Louisiana Business Corporation Law). Provisions of the Louisiana Business Corporation Act eliminated the concept of treasury stock and provide that shares reacquired by a company are to be treated as authorized but unissued shares. As a result of this change in law, for the consolidated financial statements beginning with the quarterly period ended

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March 31, 2015, the Company classifies shares previously classified as treasury stock as a reduction to issued shares of common stock, and accordingly, adjusts the stated value of common stock and paid-in-capital.

COMPREHENSIVE INCOME

Accounting principles generally require that recognized revenue, expenses, gains, and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities and cash flow hedges, are reported as a separate component of the shareholders’ equity section of the consolidated balance sheets, such items, along with net income, are components of comprehensive income.

FAIR VALUE MEASUREMENTS

Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company estimates fair value based on the assumptions market participants would use when selling an asset or transferring a liability and characterizes such measurements within the fair value hierarchy based on the inputs used to develop those assumptions and measure fair value. The hierarchy requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:

• Level 1 - Quoted prices in active markets for identical assets or liabilities.

• Level 2 - Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

• Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies, and similar techniques that use significant unobservable inputs.

A description of the valuation methodologies used for instruments measured at fair value follows, as well as the classification of such instruments within the valuation hierarchy. The descriptions below are exclusive of assets or liabilities acquired in business combinations, as all such instruments are required to initially be measured at fair value.

Cash and cash equivalents

The carrying amounts of cash and cash equivalents approximate their fair value.

Investment securities

Securities are classified within Level 1 where quoted market prices are available in an active market. Inputs include securities that have quoted prices in active markets for identical assets. If quoted market prices are unavailable, fair value is estimated using quoted prices of securities with similar characteristics, at which point the securities are classified within Level 2 of the hierarchy.

Mortgage loans held for sale

Mortgage loans originated and held for sale are recorded at fair value under the fair value option, unless otherwise noted. When determining the fair value of loans held for sale, the Company obtains quotes or bids on these loans directly from the purchasing financial institutions (Level 2).

Loans

The fair values of non-covered mortgage loans are estimated based on present values using entry-value rates (the interest rate that would be charged for a similar loan to a borrower with similar risk at the indicated balance sheet date) at December 31, 2015 and 2014, weighted for varying maturity dates. Other non-covered loans are valued based on present values using entry-value interest rates at December 31, 2015 and 2014 applicable to each category of loans, which are classified within Level 3 of the hierarchy. Covered loans are measured using projections of expected cash flows, exclusive of the loss sharing agreements with the FDIC. Fair value of the covered loans reflects the current fair value of these loans, which is based on an updated estimate of the projected cash flow as of the dates indicated. The fair value associated with the loans includes estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows, which also are classified within Level 3 of the hierarchy.

Impaired loans

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Loans are measured for impairment using the methods permitted by ASC Topic 310, Receivables. Fair value measurements are used in determining impairment using either the loan’s observable market price (Level 1), if available, or the fair value of the collateral, if the loan is collateral dependent (Level 2). Measuring the impairment of loans using the present value of expected future cash flows, discounted at the loan’s effective interest rate, is not considered a fair value measurement. Fair value of the collateral is determined by appraisals or independent valuation.

FDIC Loss Share Receivables

The fair value of FDIC loss share receivables are determined using projected cash flows from loss sharing agreements based on expected reimbursements for losses at the applicable loss sharing percentages based on the terms of the loss share agreements. Cash flows are discounted to reflect the timing and receipt of the loss sharing reimbursements from the FDIC. The fair value of the Company’s FDIC loss share receivables are categorized within Level 3 of the hierarchy.

Other real estate owned

Fair values of OREO are determined by sales agreement or appraisal and costs to sell are based on estimation per the terms and conditions of the sales agreement or amounts commonly used in real estate transactions. Inputs include appraisal values on the properties or recent sales activity for similar assets in the property’s market, and thus OREO measured at fair value is classified within Level 2 of the hierarchy.

Derivative financial instruments

Fair values of interest rate swaps, interest rate locks, forward sales commitments, and written and purchased options are estimated using prices of financial instruments with similar characteristics and thus are classified within Level 2 of the fair value hierarchy.

Deposits

The fair values of NOW accounts, money market deposits and savings accounts are the amounts payable on demand at the reporting date. Certificates of deposit are valued using a discounted cash flow model based on the weighted-average rate at December 31, 2015 and 2014 for deposits with similar remaining maturities. The fair value of the Company’s deposits are categorized within Level 3 of the fair value hierarchy.

Short-term borrowings

The carrying amounts of short-term borrowings maturing within ninety days approximate their fair values.

Long-term debt

The fair values of long-term debt are estimated using discounted cash flow analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. The fair value of the Company’s long-term debt is categorized within Level 3 of the fair value hierarchy.

Off-balance sheet items

The Company has outstanding commitments to extend credit and standby letters of credit. These off-balance sheet financial instruments are generally exercisable at the market rate prevailing at the date the underlying transaction will be completed. At December 31, 2015 and 2014, the fair value of guarantees under commercial and standby letters of credit was immaterial.

NOTE 2 – RECENT ACCOUNTING PRONOUNCEMENTS

ASU No. 2014-01

In January 2014, the FASB issued ASU No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). The ASU allows for use of the proportional amortization method for investments in qualified affordable housing projects, if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized in the consolidated statements of comprehensive income as a component of income tax expense. The ASU provides for a practical expedient, which allows for amortization of the investment in proportion to only the tax credits if it produces a measurement that is substantially similar to the measurement that would result from using both tax credits and other tax benefits.

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The ASU was effective for fiscal years and interim periods beginning after December 15, 2014. The Company adopted this guidance effective January 1, 2015, utilizing the practical expedient method. Amortization expense related to qualified affordable housing investments has been presented net of the income tax credits in "income tax expense" in the consolidated statements of comprehensive income. The standard was required to be applied retrospectively; therefore, prior periods have been restated in accordance with GAAP. The impact of the adoption of ASU 2014-01 was not material to the consolidated financial statements in current or prior periods.

ASU No. 2014-09 and 2015-14

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which implements a common revenue standard and clarifies the principles used for recognizing revenue. The amendments in the ASU clarify that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. As part of that principle, the entity should identify the contract(s) with the customer, identify the performance obligation(s) of the contract, determine the transaction price, allocate that transaction price to the performance obligation(s) of the contract, and then recognize revenue when or as the entity satisfies the performance obligation(s).

In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date, which deferred the original effective date declared in ASU No. 2014-09 by one year. Accordingly, the amendments in ASU No. 2014-09 will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that annual reporting period. The amendments will be applied through the election of one of two retrospective methods.The Company is currently assessing the effect, but does not expect the adoption will have a significant impact on the Company’s consolidated financial statements.

ASU No. 2015-02

In February 2015, the FASB issued ASU No. 2015-02, Consolidation - Amendments to the Consolidation Analysis, which changes the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The amendments in the guidance: 1) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, 2) eliminate the presumption that a general partner should consolidate a limited partnership, 3) affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, and 4) provide a scope exception from consolidation guidance for certain investment funds.

ASU No. 2015-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The guidance may be applied using a modified retrospective approach by recording a cumulative effect adjustment to equity as of the beginning of the fiscal year of adoption. The amendments may also be applied retrospectively. The Company does not believe the adoption of the ASU will have a significant impact on the Company’s consolidated financial statements.

ASU No. 2015-03

In April 2015, the FASB issued ASU No. 2015-03, Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs, in an effort to comply with its simplification initiative to reduce complexity in accounting standards. ASU No. 2015-03 requires debt issuance costs related to a debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the debt liability. ASU No. 2015-03 does not affect recognition and measurement guidance for debt issuance costs.

ASU No. 2015-03 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The amendment will be applied retrospectively. The adoption of this ASU will not have a significant impact on the Company's consolidated financial statements.

ASU No. 2015-05

In April 2015, the FASB issued ASU No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement, which provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The determination of whether an arrangement contains a software license may impact the classification of the costs associated with the arrangement and the reporting period in which the costs are recognized as expense.

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The amendments will be effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. The Company has determined it will elect to adopt the amendments prospectively to all arrangements entered into or materially modified beginning January 1, 2016. The amendments will be applied prospectively on an individual arrangement basis and the impact to the Company’s consolidated financial statements will vary depending on the terms and conditions of the individual arrangement.

ASU No. 2015-16

In September 2015, the FASB issued ASU No. 2015-16, Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments. ASU No. 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined and present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current period earnings by line item that would have been have been recorded in previous reporting periods if the adjustment had been recognized as of the acquisition date.

ASU No. 2015-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The guidance must be applied prospectively for adjustments to provisional amounts that occur after the effective date of this update with earlier application permitted for financial statements that have not been issued. The Company adopted this guidance effective September 30, 2015. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

ASU No. 2016-01

In January 2016, the FASB issued ASU No. 2016-01, Financial Statements - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments will not change the guidance for classifying and measuring investments in debt securities or loans; however, the significant amendments will include changes related to how entities measure certain equity investments, recognize changes in the fair value of financial liabilities measured under the fair value option that are attributable to instrument-specific credit risk, and disclose and present financial assets and liabilities on the Company’s consolidated financial statements.

Specifically, the aforementioned amendments will require measurement of equity investments at fair value, with changes recognized in net income, unless the investments qualify for the new practicability exception, the equity method of accounting, or consolidation. For financial liabilities measured using the fair value option, any change in fair value caused by a change in an entity’s own credit risk will be recognized separately in OCI, as opposed to earnings. The amendments will also require entities to present financial assets and financial liabilities separately, grouped by measurement category and form of financial asset in the statement of financial position or in the accompanying notes to the financial statements. Entities will also no longer have to disclose the methods and significant assumptions for financial instruments measured at amortized cost, but will be required to measure such instruments under the “exit price” notion for disclosure purposes.

ASU No. 2016-01 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. An entity will record a cumulative-effect adjustment to beginning retained earnings as of the beginning of the first reporting period in which the guidance is adopted, with two exceptions. The amendments related to equity investments without readily determinable fair values (including disclosure requirements) will be effective prospectively. The requirement to use the exit price notion to measure the fair value of financial instruments for disclosure purposes will also be applied prospectively. The Company is currently evaluating the impact of the ASU on the Company’s consolidated financial statements.

NOTE 3 –ACQUISITION ACTIVITY

2015 Acquisitions

Acquisition of Florida Bank Group, Inc.

On February 28, 2015, the Company acquired Florida Bank Group, Inc. ("Florida Bank Group"), the holding company of Florida Bank, a Tampa, Florida-based commercial bank servicing Tampa, Tallahassee and Jacksonville, Florida. Under the terms of the agreement, Florida Bank Group shareholders received a combination of cash and shares of the Company’s common stock. Florida Bank Group shareholders received cash equal to $7.81 per share of then outstanding Florida Bank Group common stock, including shares of preferred stock that converted to common shares in the acquisition. Each Florida Bank Group common share was exchanged for 0.149 of a share of the Company’s common stock, as well as a cash payment for any fractional share. All unexercised Florida Bank Group stock options at the closing date were settled for cash at fair value based on the closing price.

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The Company acquired all of the outstanding common stock of the former Florida Bank Group shareholders for total consideration of $90.5 million, which resulted in goodwill of $15.7 million, as shown in the table below. With this acquisition, IBERIABANK entered the Tampa, Tallahassee and Jacksonville areas of Florida through the addition of 12 bank offices and an experienced in-market team that enhances IBERIABANK's ability to compete in those markets. The Company projects cost savings will be recognized in future periods through the elimination of redundant operations. The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	752,493	$	47,497
Total equity consideration		47,497
Non-Equity consideration
Cash		42,988
Total consideration paid		90,485
Fair value of net assets assumed including identifiable intangible assets		74,781
Goodwill		$	15,704

Acquisition of Old Florida Bancshares, Inc.

On March 31, 2015, the Company acquired Old Florida Bancshares, Inc. (“Old Florida”), the holding company of Old Florida Bank and New Traditions Bank, which were Orlando, Florida-based commercial banks. Under the terms of the agreement, for each share of Old Florida common stock outstanding, Old Florida shareholders received 0.34 of a share of the Company’s common stock, as well as a cash payment for any fractional share.

The Company acquired all of the outstanding common stock of the former Old Florida shareholders for total consideration of $253.2 million, which resulted in goodwill of $99.6 million, as shown in the table below. With this acquisition, IBERIABANK entered into the Orlando, Florida MSA through the addition of 14 bank offices and an experienced in-market team. The Company projects cost savings will be recognized in future periods through the elimination of redundant operations. The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	3,839,554	$	242,007
Total equity consideration		242,007
Non-Equity consideration
Cash		11,145
Total consideration paid		253,152
Fair value of net assets assumed including identifiable intangible assets		153,514
Goodwill		$	99,638

Acquisition of Georgia Commerce Bancshares, Inc.

On May 31, 2015, the Company acquired Georgia Commerce Bancshares, Inc. (“Georgia Commerce”), the holding company of Georgia Commerce Bank. Under the terms of the agreement, Georgia Commerce shareholders received 0.6134 of a share of the Company's common stock for each of the Georgia Commerce common stock shares outstanding, as well as a cash payment for any fractional share. All unexercised Georgia Commerce stock options on the closing date were settled for cash at fair value based on the closing price.

The Company acquired all of the outstanding common stock of the former Georgia Commerce shareholders for total consideration of $190.3 million, which resulted in goodwill of $87.3 million, as shown in the table below. With this acquisition, IBERIABANK entered into the Atlanta, Georgia MSA through the addition of nine bank offices and an experienced in-market team. The Company projects cost savings will be recognized in future periods through elimination of redundant operations. The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

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(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	2,882,357	$	185,249
Total equity consideration		185,249
Non-Equity consideration
Cash		5,015
Total consideration paid		190,264
Fair value of net assets assumed including identifiable intangible assets		102,945
Goodwill		$	87,319

The Company accounted for the aforementioned business combinations under the acquisition method in accordance with ASC Topic 805, Business Combinations. Accordingly, for each transaction the purchase price is allocated to the fair value of the assets acquired and liabilities assumed as of the date of acquisition. The following purchase price allocations on these acquisitions are preliminary and will be finalized upon the receipt of final valuations on certain assets and liabilities. In conjunction with the adoption of ASU 2015-16 as of September 30, 2015, upon receipt of final fair value estimates during the measurement period, which must be within one year of the acquisition dates, the Company will record any adjustments to the preliminary fair value estimates in the reporting period in which the adjustments are determined. Information regarding the Company's loan discounts and related deferred tax assets, core deposit intangible assets and related deferred tax liabilities, as well as income taxes payable and the related deferred tax balances, among other assets and liabilities recorded in the acquisitions, may be adjusted as the Company refines its estimates. Determining the fair value of assets and liabilities, particularly illiquid assets and liabilities, is a complicated process involving significant judgment. Fair value adjustments based on updated estimates could materially affect the goodwill recorded on the acquisitions. The Company may incur losses on the acquired loans that are materially different from losses the Company originally projected and included in the fair value estimates of loans.

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The acquired assets and liabilities, as well as the preliminary adjustments to record those assets and liabilities at their estimated fair values, are presented in the following tables.

Florida Bank Group	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	72,982	$	—			$	72,982
Investment securities	107,236		136			(1)	107,372
Loans	312,902		(5,371		)	(2)	307,531
Other real estate owned	498		(75		)	(3)	423
Core deposit intangible	—		4,489			(4)	4,489
Deferred tax asset, net	19,889		8,569			(5)	28,458
Other assets	29,817		(8,949		)	(6)	20,868
Total Assets	$	543,324	$	(1,201	)		$	542,123
Liabilities
Interest-bearing deposits	$	282,417	$	263		(7)	$	282,680
Non-interest-bearing deposits	109,548		—				109,548
Borrowings	60,000		8,598			(8)	68,598
Other liabilities	1,898		4,618			(9)	6,516
Total Liabilities	$	453,863	$	13,479			$	467,342

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Florida Bank Group’s investments to their estimated fair values on the date of acquisition.

(2) The amount represents the adjustment of the book value of Florida Bank Group's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(3) The adjustment represents the adjustment of Florida Bank Group's OREO to its estimated fair value less costs to sell on the date of acquisition.

(4) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(5) The amount represents the net deferred tax asset recognized on the fair value adjustments of Florida Bank Group acquired assets and assumed liabilities.

(6) The amount represents the adjustment of the book value of Florida Bank Group’s property, equipment, and other assets to their estimated fair values at the acquisition date based on their appraised value.

(7) The amount represents the adjustment of the book value of Florida Bank Group's time deposits to their estimated fair values at the date of acquisition.

(8) The amount represents the adjustment of the book value of Florida Bank Group’s borrowings to their estimated fair value based on current interest rates and the credit characteristics inherent in the liability.

(9) The amount is necessary to record Florida Bank Group's rent liability at fair value.

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Old Florida	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	360,688	$	—			$	360,688
Investment securities	67,209		—				67,209
Loans held for sale	5,952		—				5,952
Loans	1,073,773		(10,822		)	(1)	1,062,951
Other real estate owned	4,515		1,449			(2)	5,964
Core deposit intangible	—		6,821			(3)	6,821
Deferred tax asset, net	10,629		4,388			(4)	15,017
Other assets	30,549		(7,238		)	(5)	23,311
Total Assets	$	1,553,315	$	(5,402	)		$	1,547,913
Liabilities
Interest-bearing deposits	$	1,048,765	$	123		(6)	$	1,048,888
Non-interest-bearing deposits	340,869		—				340,869
Borrowings	1,528		—				1,528
Other liabilities	3,038		76			(7)	3,114
Total Liabilities	$	1,394,200	$	199			$	1,394,399

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Old Florida's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(2) The adjustment represents the adjustment of Old Florida's OREO to its estimated fair value less costs to sell on the date of acquisition.

(3) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(4) The amount represents the net deferred tax asset recognized on the fair value adjustments of Old Florida acquired assets and assumed liabilities.

(5) The amount represents the adjustment of the book value of Old Florida’s property, equipment, and other assets to their estimated fair values at the acquisition date based on their appraised value.

(6) The amount represents the adjustment of the book value of Old Florida's time deposits to their estimated fair values on the date of acquisition.

(7) The adjustment is necessary to record Old Florida's rent liability at fair value.

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Georgia Commerce	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	51,059	$	—			$	51,059
Investment securities	135,710		(806		)	(1)	134,904
Loans held for sale	1,249		—				1,249
Loans	807,726		(15,606		)	(2)	792,120
Other real estate owned	9,795		(4,207		)	(3)	5,588
Core deposit intangible	—		6,720			(4)	6,720
Deferred tax asset, net	5,031		5,451			(5)	10,482
Other assets	28,952		(657		)	(6)	28,295
Total Assets	$	1,039,522	$	(9,105	)		$	1,030,417
Liabilities
Interest-bearing deposits	$	658,133	$	176		(7)	$	658,309
Non-interest-bearing deposits	249,739		—				249,739
Borrowings	13,203		—				13,203
Other liabilities	6,221		—				6,221
Total Liabilities	$	927,296	$	176			$	927,472

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Georgia Commerce’s investments to their estimated fair values on the date of acquisition.

(2) The amount represents the adjustment of the book value of Georgia Commerce's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(3) The adjustment represents the adjustment of Georgia Commerce's OREO to its estimated fair value less costs to sell on the date of acquisition.

(4) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(5) The amount represents the net deferred tax asset recognized on the fair value adjustments of Georgia Commerce acquired assets and assumed liabilities.

(6) The amount represents the adjustment of the book value of Georgia Commerce’s property, equipment, and other assets to their estimated fair value at the acquisition date based on their appraised value.

(7) The amount represents the adjustment of the book value of Georgia Commerce's time deposits to their estimated fair values at the date of acquisition.

Supplemental unaudited pro forma information

The following unaudited pro forma information for the years ended December 31, 2014 and 2013 reflect the Company’s estimated consolidated results of operations as if the acquisitions of Florida Bank Group, Old Florida, and Georgia Commerce occurred at January 1, 2014, unadjusted for potential cost savings and preliminary purchase price adjustments.

(Dollars in thousands, except per share data)	2014		2013
Interest and non-interest income	$	803,722	$	699,308
Net income	172,554		69,625
Earnings per share - basic	4.39		1.88
Earnings per share - diluted	4.38		1.88

The Company’s consolidated financial statements as of and for the year ended December 31, 2015 include the operating results of the acquired assets and assumed liabilities for the days subsequent to the respective acquisition dates. Due to the system conversions of the acquired entities throughout the current year and subsequent streamlining and integration of the operating activities into those of the Company, historical reporting for the former Florida Bank Group, Old Florida, and Georgia

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Commerce branches is impracticable and thus disclosure of the revenue from the assets acquired and income before income taxes is impracticable for the period subsequent to acquisition.

2014 Acquisitions

During 2014, the Company completed the acquisitions of Trust-One Memphis, Teche and First Private. The following table summarizes consideration paid, net assets acquired and goodwill recognized.

(Dollars in thousands)	Consideration Paid		Net Assets Acquired			Goodwill Recognized
Trust One Bank - Memphis Operations	$	—	$	(8,596	)	$	8,596
Teche Holding Company	156,740		76,311			80,429
First Private Holdings, Inc.	58,640		32,387			26,253

In addition, during 2014, the Company's subsidiary, LTC, acquired certain assets from The Title Company, LLC, a title office in Baton Rouge, Louisiana, and Louisiana Abstract and Title, LLC, a title office in Shreveport, Louisiana. These two acquisitions were immaterial and the assets recognized were primarily from goodwill and additional intangible assets.

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NOTE 4 – INVESTMENT SECURITIES

The amortized cost and fair values of investment securities, with gross unrealized gains and losses, consist of the following:

	December 31, 2015
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	252,514	$	1,161	$	(1,592	)	$	252,083
Obligations of state and political subdivisions	182,541		5,429		(9		)	187,961
Mortgage-backed securities	2,272,879		8,457		(16,523		)	2,264,813
Other securities	95,496		430		(497		)	95,429
Total securities available for sale	$	2,803,430	$	15,477	$	(18,621	)	$	2,800,286
Securities held to maturity:
Obligations of state and political subdivisions	$	69,979	$	2,803	$	(101	)	$	72,681
Mortgage-backed securities	28,949		107		(776		)	28,280
Total securities held to maturity	$	98,928	$	2,910	$	(877	)	$	100,961

	December 31, 2014
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	317,386	$	1,700	$	(3,533	)	$	315,553
Obligations of state and political subdivisions	86,513		3,679		(2		)	90,190
Mortgage-backed securities	1,741,917		16,882		(7,184		)	1,751,615
Other securities	1,460		35		—			1,495
Total securities available for sale	$	2,147,276	$	22,296	$	(10,719	)	$	2,158,853
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	10,000	$	88	$	—		$	10,088
Obligations of state and political subdivisions	77,597		3,153		(145		)	80,605
Mortgage-backed securities	29,363		151		(726		)	28,788
Total securities held to maturity	$	116,960	$	3,392	$	(871	)	$	119,481

Securities with carrying values of $1.4 billion were pledged to secure public deposits and other borrowings at both December 31, 2015 and 2014.

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Information pertaining to securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, is as follows:

	December 31, 2015
	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(1,214	)	$	177,839	$	(378	)	$	28,116	$	(1,592	)	$	205,955
Obligations of state and political subdivisions	(9		)	5,765		—			—		(9		)	5,765
Mortgage-backed securities	(11,737		)	1,279,914		(4,786		)	185,215		(16,523		)	1,465,129
Other securities	(488		)	51,975		(9		)	499		(497		)	52,474
Total securities available for sale	$	(13,448	)	$	1,515,493	$	(5,173	)	$	213,830	$	(18,621	)	$	1,729,323
Securities held to maturity:
Obligations of state and political subdivisions	$	(9	)	$	1,999	$	(92	)	$	4,162	$	(101	)	$	6,161
Mortgage-backed securities	(45		)	3,530		(731		)	17,573		(776		)	21,103
Total securities held to maturity	$	(54	)	$	5,529	$	(823	)	$	21,735	$	(877	)	$	27,264

	December 31, 2014
	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	—		$	—	$	(3,533	)	$	240,498	$	(3,533	)	$	240,498
Obligations of state and political subdivisions	(2		)	185		—			—		(2		)	185
Mortgage-backed securities	(1,189		)	304,686		(5,995		)	294,549		(7,184		)	599,235
Total securities available for sale	$	(1,191	)	$	304,871	$	(9,528	)	$	535,047	$	(10,719	)	$	839,918
Securities held to maturity:
Obligations of state and political subdivisions	$	(9	)	$	2,287	$	(136	)	$	8,590	$	(145	)	$	10,877
Mortgage-backed securities	—			—		(726		)	20,812		(726		)	20,812
Total securities held to maturity	$	(9	)	$	2,287	$	(862	)	$	29,402	$	(871	)	$	31,689

The Company assessed the nature of the unrealized losses in its portfolio as of December 31, 2015 and 2014 to determine if there are losses that should be deemed other-than-temporary. In its analysis of these securities, management considered numerous factors to determine whether there were instances where the amortized cost basis of the debt securities would not be fully recoverable, including, but not limited to:

• The length of time and extent to which the estimated fair value of the securities was less than their amortized cost,

• Whether adverse conditions were present in the operations, geographic area, or industry of the issuer,

• The payment structure of the security, including scheduled interest and principal payments, including the issuer’s failures to make scheduled payments, if any, and the likelihood of failure to make scheduled payments in the future,

• Changes to the rating of the security by a rating agency, and

• Subsequent recoveries or additional declines in fair value after the balance sheet date.

82

Management believes it has considered these factors, as well as all relevant information available, when determining the expected future cash flows of the securities in question. In each instance, management has determined the cost basis of the securities would be fully recoverable. Management also has the intent to hold debt securities until their maturity or anticipated recovery if the security is classified as available for sale. In addition, management does not believe the Company will be required to sell debt securities before the anticipated recovery of the amortized cost basis of the security. As a result of the Company's analysis, no declines in the estimated fair value of the Company's investment securities were deemed to be other-than-temporary at December 31, 2015 or 2014.

At December 31, 2015, 252 debt securities had unrealized losses of 1.10% of the securities’ amortized cost basis. At December 31, 2014, 112 debt securities had unrealized losses of 1.31% of the securities’ amortized cost basis. The unrealized losses for each of the securities related to market interest rate changes and not credit concerns of the issuers. Additional information on securities that have been in a continuous loss position for over twelve months at December 31 is presented in the following table.

(Dollars in thousands)	2015		2014
Number of securities
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	40		66
Issued by political subdivisions	2		5
Other	1		—
	43		71
Amortized Cost Basis
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	$	236,800	$	566,113
Issued by political subdivisions	4,253		8,727
Other	508		—
	$	241,561	$	574,840
Unrealized Loss
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	$	5,895	$	10,254
Issued by political subdivisions	92		136
Other	9		—
	$	5,996	$	10,390

The Fannie Mae, Freddie Mac, and Ginnie Mae securities are rated AA+ by S&P and Aaa by Moodys. Two of the securities in a continuous loss position for over twelve months were issued by political subdivisions. The securities issued by political subdivisions have S&P credit ratings ranging from AA to AAA and Moody's credit ratings ranging from Aa2 to Aaa.

The amortized cost and estimated fair value of investment securities by maturity at December 31, 2015 are presented in the following table. Securities are classified according to their contractual maturities without consideration of principal amortization, potential prepayments or call options. Accordingly, actual maturities may differ from contractual maturities. Weighted average yields are calculated on the basis of the yield to maturity based on the amortized cost of each security.

	Securities Available for Sale						Securities Held to Maturity
(Dollars in thousands)	Weighted Average Yield		Amortized Cost		Estimated Fair Value		Weighted Average Yield		Amortized Cost		Estimated Fair Value
Within one year or less	2.02	%	$	14,360	$	14,373	3.83	%	$	75	$	75
One through five years	1.72		318,423		318,718		3.06		13,627		13,989
After five through ten years	2.31		501,217		506,856		2.89		16,278		16,914
Over ten years	2.14		1,969,430		1,960,339		2.91		68,948		69,983
	2.12	%	$	2,803,430	$	2,800,286	2.93	%	$	98,928	$	100,961

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The following is a summary of realized gains and losses from the sale of securities classified as available for sale. Gains or losses on securities sold are recorded on the trade date, using the specific identification method.

	Year Ended December 31
(Dollars in thousands)	2015			2014			2013
Realized gains	$	1,834		$	863		$	2,387
Realized losses	(259		)	(92		)	(110		)
	$	1,575		$	771		$	2,277

In addition to the gains above, the Company realized certain immaterial gains on calls of securities held to maturity.

Other Equity Securities

The Company accounts for the following securities at amortized cost, which approximates fair value, in “other assets” on the consolidated balance sheets at December 31:

(Dollars in thousands)	2015		2014
Federal Home Loan Bank (FHLB) stock	$	16,265	$	38,476
Federal Reserve Bank (FRB) stock	48,584		34,348
Other investments	1,159		1,306
	$	66,008	$	74,130

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NOTE 5 – LOANS

Loans consist of the following, segregated into legacy and acquired loans, for the periods indicated:

	December 31, 2015
(Dollars in thousands)	Legacy Loans		Acquired Loans		Total
Commercial loans:
Real estate	$	4,504,062	$	1,569,449	$	6,073,511
Commercial and industrial	2,952,102		492,476		3,444,578
Energy-related	677,177		3,589		680,766
	8,133,341		2,065,514		10,198,855
Residential mortgage loans:
Residential 1-4 family	610,986		501,296		1,112,282
Construction / Owner Occupied	83,037		—		83,037
	694,023		501,296		1,195,319
Consumer and other loans:
Home equity	1,575,643		490,524		2,066,167
Indirect automobile	246,214		84		246,298
Other	541,299		79,490		620,789
	2,363,156		570,098		2,933,254
Total	$	11,190,520	$	3,136,908	$	14,327,428

	December 31, 2014
(Dollars in thousands)	Legacy Loans		Acquired Loans		Total
Commercial loans:
Real estate	$	3,676,811	$	684,968	$	4,361,779
Commercial and industrial	2,452,521		119,174		2,571,695
Energy-related	872,866		7,742		880,608
	7,002,198		811,884		7,814,082
Residential mortgage loans:
Residential 1-4 family	495,638		552,603		1,048,241
Construction / Owner Occupied	32,056		—		32,056
	527,694		552,603		1,080,297
Consumer and other loans:
Home equity	1,290,976		310,129		1,601,105
Indirect automobile	396,766		392		397,158
Other	451,080		97,322		548,402
	2,138,822		407,843		2,546,665
Total	$	9,668,714	$	1,772,330	$	11,441,044

Since 2009, the Company has acquired certain assets and liabilities of six failed banks. Substantially all of the loans and foreclosed real estate that were acquired through these transactions were covered by loss share agreements between the FDIC and IBERIABANK, which afforded IBERIABANK loss protection. Covered loans, which are included in acquired loans in the tables above, were $229.2 million and $444.5 million at December 31, 2015 and 2014, respectively, of which $191.7 million and $220.5 million, respectively, were residential mortgage and home equity loans. Refer to Note 7 for additional information regarding the Company’s loss sharing agreements.

Net deferred loan origination fees were $18.7 million and $11.2 million at December 31, 2015 and 2014, respectively. In addition to loans issued in the normal course of business, the Company considers overdrafts on customer deposit accounts to be loans and reclassifies these overdrafts as loans in its consolidated balance sheets. At December 31, 2015 and 2014, overdrafts of $5.1 million and $5.6 million, respectively, have been reclassified to loans.

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Loans with carrying values of $3.9 billion and $3.1 billion were pledged as collateral for borrowings at December 31, 2015 and 2014, respectively.

Aging Analysis

The following tables provide an analysis of the aging of loans as of December 31, 2015 and 2014. Due to the difference in accounting for acquired loans, the tables below further segregate the Company’s loans between loans originated by the Company ("legacy loans") and acquired loans.

	December 31, 2015
	Legacy loans
	Past Due (1)								Current		Total Legacy Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	801	$	—	$	120	$	921	$	635,560	$	636,481	$	—
Commercial real estate - Other	2,687		793		15,517		18,997		3,848,584		3,867,581		95
Commercial and industrial	1,208		739		6,746		8,693		2,943,409		2,952,102		87
Energy-related	15		—		7,081		7,096		670,081		677,177		—
Residential mortgage	1,075		2,485		14,116		17,676		676,347		694,023		442
Consumer - Home equity	3,549		870		5,628		10,047		1,565,596		1,575,643		—
Consumer - Indirect automobile	2,187		518		1,181		3,886		242,328		246,214		—
Consumer - Credit card	394		113		394		901		76,360		77,261		—
Consumer - Other	1,923		752		769		3,444		460,594		464,038		—
Total	$	13,839	$	6,270	$	51,552	$	71,661	$	11,118,859	$	11,190,520	$	624
	December 31, 2014
	Legacy loans
	Past Due (1)								Current		Total Legacy Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	507	$	—	$	69	$	576	$	483,663	$	484,239	$	—
Commercial real estate - Other	11,799		148		6,859		18,806		3,173,766		3,192,572		—
Commercial and industrial	1,589		1,860		3,225		6,674		2,445,847		2,452,521		200
Energy-related	—		—		27		27		872,839		872,866		—
Residential mortgage	1,389		2,616		14,900		18,905		508,789		527,694		538
Consumer - Home equity	4,096		595		7,420		12,111		1,278,865		1,290,976		16
Consumer - Indirect automobile	2,447		396		1,419		4,262		392,504		396,766		—
Consumer - Credit card	253		163		1,032		1,448		71,297		72,745		—
Consumer - Other	1,285		424		773		2,482		375,853		378,335		—
Total	$	23,365	$	6,202	$	35,724	$	65,291	$	9,603,423	$	9,668,714	$	754

(1) Past due loans greater than 90 days include all loans on non-accrual status, regardless of past due status, as of the period indicated. Non-accrual loans are presented separately in the “Non-accrual Loans” section below.

86

	December 31, 2015
	Acquired loans
	Past Due (1)								Current		Discount/ Premium			Total Acquired Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	216	$	117	$	6,994	$	7,327	$	120,467	$	(2,368	)	$	125,426	$	6,994
Commercial real estate - Other	4,295		2,024		53,558		59,877		1,434,966		(50,820		)	1,444,023		52,067
Commercial and industrial	1,016		1,276		6,829		9,121		490,255		(6,900		)	492,476		5,674
Energy-related	—		—		1,368		1,368		2,221		—			3,589		1,198
Residential mortgage	73		1,806		22,873		24,752		506,103		(29,559		)	501,296		21,765
Consumer - Home equity	2,859		997		12,525		16,381		503,635		(29,492		)	490,524		11,234
Consumer - Indirect automobile	—		—		12		12		72		—			84		12
Consumer - Credit Card	—		—		17		17		565		—			582		17
Consumer - Other	580		211		667		1,458		79,167		(1,717		)	78,908		461
Total	$	9,039	$	6,431	$	104,843	$	120,313	$	3,137,451	$	(120,856	)	$	3,136,908	$	99,422
	December 31, 2014
	Acquired loans
	Past Due (1)								Current		Discount/ Premium			Total Acquired Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	2,740	$	57	$	8,225	$	11,022	$	64,393	$	(4,482	)	$	70,933	$	8,225
Commercial real estate - Other	4,986		3,330		67,302		75,618		588,947		(50,530		)	614,035		67,198
Commercial and industrial	2,118		70		4,528		6,716		119,472		(7,014		)	119,174		4,528
Energy-related	—		—		11		11		7,731		—			7,742		11
Residential mortgage	324		2,788		30,804		33,916		559,180		(40,493		)	552,603		29,553
Consumer - Home equity	3,165		385		22,800		26,350		315,788		(32,009		)	310,129		22,409
Consumer - Indirect automobile	13		17		9		39		393		(40		)	392		9
Consumer - Credit Card	10		—		24		34		614		—			648		24
Consumer - Other	1,458		113		1,967		3,538		94,652		(1,516		)	96,674		1,847
Total	$	14,814	$	6,760	$	135,670	$	157,244	$	1,751,170	$	(136,084	)	$	1,772,330	$	133,804

(1) Past due information presents acquired loans at the gross loan balance, prior to application of discounts.

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Non-accrual Loans

The following table provides the unpaid principal balance of legacy loans on non-accrual status at December 31, 2015 and 2014.

(Dollars in thousands)	2015		2014
Commercial real estate - Construction	$	120	$	69
Commercial real estate - Other	15,422		6,859
Commercial and industrial	6,659		3,025
Energy-related	7,081		27
Residential mortgage	13,674		14,362
Consumer - Home equity	5,628		7,404
Consumer - Indirect automobile	1,181		1,419
Consumer - Credit card	394		1,032
Consumer - Other	769		773
Total	$	50,928	$	34,970

The amount of interest income that would have been recorded in 2015, 2014 and 2013 if total non-accrual loans had been current in accordance with their contractual terms was approximately $2.1 million, $1.8 million and $2.9 million, respectively.

Loans Acquired

As discussed in Note 3, during 2015, the Company acquired loans with fair values of $0.3 billion from Florida Bank Group, $1.1 billion from Old Florida, and $0.8 billion from Georgia Commerce. Of the total $2.2 billion of loans acquired during 2015, $2.1 billion were determined to have no evidence of deteriorated credit quality and are accounted for under ASC Topics 310-10 and 310-20. The remaining $57.8 million were determined to exhibit deteriorated credit quality since origination under ASC 310-30. The tables below show the balances acquired during 2015 for these two subsections of the acquired portfolio as of the acquisition date. These amounts are subject to change due to the finalization of purchase accounting adjustments.

(Dollars in thousands)
Contractually required principal and interest at acquisition	$	2,384,114
Expected losses and foregone interest	(15,539		)
Cash flows expected to be collected at acquisition	2,368,575
Fair value of acquired loans at acquisition	$	2,105,466

(Dollars in thousands)	Acquired Impaired Loans
Contractually required principal and interest at acquisition	$	76,445
Non-accretable difference (expected losses and foregone interest)	(11,867		)
Cash flows expected to be collected at acquisition	64,578
Accretable yield	(6,823		)
Basis in acquired loans at acquisition	$	57,755

88

The following is a summary of changes in the accretable difference for loans accounted for under ASC 310-30 during the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Balance at beginning of period	$	287,651		$	354,892		$	356,393
Additions	6,823			13,848			—
Transfers from non-accretable difference to accretable yield	9,916			25,844			50,743
Accretion	(80,479		)	(103,233		)	(179,456		)
Changes in expected cash flows not affecting non-accretable differences (1)	3,591			(3,700		)	127,212
Balance at end of period	$	227,502		$	287,651		$	354,892

(1) Includes changes in cash flows expected to be collected due to the impact of changes in actual or expected timing of liquidation events, modifications, changes in interest rates and changes in prepayment assumptions.

Troubled Debt Restructurings

Information about the Company’s troubled debt restructurings ("TDRs") at December 31, 2015 and 2014 is presented in the following tables. Modifications of loans that are accounted for within a pool under ASC Topic 310-30, which include covered loans, as well as certain other acquired loans are excluded as TDRs. Accordingly, such modifications do not result in the removal of those loans from the pool, even if the modification of those loans would otherwise be considered a TDR. As a result, all covered and certain acquired loans that would otherwise meet the criteria for classification as a TDR are excluded from the tables below.

TDRs totaling $57.0 million occurred during the current year. There were no material TDRs that occurred during 2014. The following table provides information on how the TDRs were modified during the year ended December 31:

(Dollars in thousands)	2015
Extended maturities	$	15,594
Interest rate adjustment	—
Maturity and interest rate adjustment	23,374
Movement to or extension of interest-rate only payments	241
Forbearance	122
Other concession(s) (1)	17,710
Total	$	57,041

(1) Other concessions may include covenant waivers, forgiveness of principal or interest associated with a customer bankruptcy, or a combination of any of the above concessions.

Of the $57.0 million TDRs occurring during the twelve months ended December 31, 2015, $34.5 million are on accrual status and $22.5 million are on non-accrual status.

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The following table presents the end of period balance for loans modified in a TDR during the year ended December 31, 2015. The Company had no material TDRs that were added during the year ended December 31, 2014.

	December 31, 2015
(In thousands, except number of loans)	Number of Loans	Pre-modification Outstanding Recorded Investment		Post-modification Outstanding Recorded Investment (1)
Commercial real estate	11	$	26,764	$	25,250
Commercial and industrial	26	21,233		18,114
Energy-related	2	9,797		9,484
Residential mortgage	1	70		68
Consumer - Home equity	50	4,440		3,865
Consumer - Indirect	6	79		79
Consumer - Other	17	248		181
Total	113	$	62,631	$	57,041

(1) Recorded investment includes any allowance for credit losses recorded on the TDRs at December 31, 2015.

Information detailing TDRs that defaulted during the years ended December 31, 2015 and 2014 and were modified in the previous twelve months (i.e., the twelve months prior to the default) is presented in the following table. The Company has defined a default as any loan with a loan payment that is currently past due greater than 30 days, or was past due greater than 30 days at any point during the previous twelve months, or since the date of modification, whichever is shorter.

	December 31, 2015			December 31, 2014
(In thousands, except number of loans)	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
Commercial real estate	6	$	22,075	30	$	—
Commercial and industrial	20	8,970		9	1,600
Energy-related	1	3,120		—	—
Residential mortgage	—	—		—	—
Consumer - Home Equity	20	1,547		—	—
Consumer - Indirect automobile	6	79		—	—
Consumer - Other	9	2		1	—
Total	62	$	35,793	40	$	1,600

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NOTE 6 – ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY

Allowance for Credit Losses Activity

A summary of changes in the allowance for credit losses for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	76,174		$	53,957		$	130,131
Provision for loan losses before adjustment attributable to FDIC loss share agreements	27,711			1,837			29,548
Adjustment attributable to FDIC loss share arrangements	—			1,360			1,360
Net provision for loan losses	27,711			3,197			30,908
Adjustment attributable to FDIC loss share arrangements	—			(1,360		)	(1,360		)
Transfer of balance to OREO	—			(1,221		)	(1,221		)
Loans charged-off	(15,778		)	(10,737		)	(26,515		)
Recoveries	5,701			734			6,435
Allowance for loan losses at end of period	$	93,808		$	44,570		$	138,378
Reserve for unfunded commitments at beginning of period	$	11,801		$	—		$	11,801
Provision for unfunded lending commitments	2,344			—			2,344
Reserve for unfunded commitments at end of period	$	14,145		$	—		$	14,145
Allowance for credit losses at end of period	$	107,953		$	44,570		$	152,523

	2014
	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	67,342		$	75,732		$	143,074
Provision for loan losses before adjustment attributable to FDIC loss share agreements	14,274			526			14,800
Adjustment attributable to FDIC loss share arrangements	—			4,260			4,260
Net provision for loan losses	14,274			4,786			19,060
Adjustment attributable to FDIC loss share arrangements	—			(4,260		)	(4,260		)
Transfer of balance to OREO	—			(7,323		)	(7,323		)
Loans charged-off	(11,312		)	(15,543		)	(26,855		)
Recoveries	5,870			565			6,435
Allowance for loan losses at end of period	$	76,174		$	53,957		$	130,131
Reserve for unfunded commitments at beginning of period	$	11,147		$	—		$	11,147
Provision for unfunded lending commitments	654			—			654
Reserve for unfunded commitments at end of period	$	11,801		$	—		$	11,801
Allowance for credit losses at end of period	$	87,975		$	53,957		$	141,932

91

	2013
	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	74,211		$	177,392		$	251,603
Provision for (Reversal of) loan losses before adjustment attributable to FDIC loss share agreements	6,828			(57,768		)	(50,940		)
Adjustment attributable to FDIC loss share arrangements	—			56,085			56,085
Net provision for (reversal of) loan losses	6,828			(1,683		)	5,145
Adjustment attributable to FDIC loss share arrangements	—			(56,085		)	(56,085		)
Transfer of balance to OREO	—			(28,126		)	(28,126		)
Transfer of balance to the RULC	(9,828		)	—			(9,828		)
Loans charged-off	(10,686		)	(15,795		)	(26,481		)
Recoveries	6,817			29			6,846
Allowance for loan losses at end of period	$	67,342		$	75,732		$	143,074
Reserve for unfunded commitments at beginning of period	$	—		$	—		$	—
Transfer of balance from the allowance for loan losses	9,828			—			9,828
Provision for unfunded lending commitments	1,319			—			1,319
Reserve for unfunded commitments at end of period	$	11,147		$	—		$	11,147
Allowance for credit losses at end of period	$	78,489		$	75,732		$	154,221

A summary of changes in the allowance for credit losses for legacy loans, by loan portfolio type, for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	26,752		$	24,455		$	5,949		$	2,678		$	16,340		$	76,174
(Reversal of) Provision for loan losses	(1,466		)	(103		)	17,917			1,493			9,870			27,711
Loans charged off	(2,525		)	(1,276		)	(3		)	(291		)	(11,683		)	(15,778		)
Recoveries	1,897			207			—			67			3,530			5,701
Allowance for loan losses at end of period	$	24,658		$	23,283		$	23,863		$	3,947		$	18,057		$	93,808
Reserve for unfunded commitments at beginning of period	$	3,370		$	3,733		$	1,596		$	168		$	2,934		$	11,801
Provision for (Reversal of) unfunded commitments	790			(285		)	1,069			662			108			2,344
Reserve for unfunded commitments at end of period	$	4,160		$	3,448		$	2,665		$	830		$	3,042		$	14,145
Allowance on loans individually evaluated for impairment	$	1,246		$	272		$	2,122		$	1		$	352		$	3,993
Allowance on loans collectively evaluated for impairment	23,412			23,011			21,741			3,946			17,705			89,815
Loans, net of unearned income:
Balance at end of period	$	4,504,062		$	2,952,102		$	677,177		$	694,023		$	2,363,156		$	11,190,520
Balance at end of period individually evaluated for impairment	28,857			20,086			13,020			70			4,608			66,641
Balance at end of period collectively evaluated for impairment	4,475,205			2,932,016			$	664,157		693,953			2,358,548			11,123,879

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	2014
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	22,872		$	20,839		$	6,878		$	2,546		$	14,207		$	67,342
Provision for (Reversal of) loan losses	2,171			4,971			(929		)	566			7,495			14,274
Loans charged off	(1,164		)	(1,400		)	—			(578		)	(8,170		)	(11,312		)
Recoveries	2,873			45			—			144			2,808			5,870
Allowance for loan losses at end of period	$	26,752		$	24,455		$	5,949		$	2,678		$	16,340		$	76,174
Reserve for unfunded commitments at beginning of period	$	3,071		$	1,814		$	3,043		$	72		$	3,147		$	11,147
Provision for (Reversal of) unfunded commitments	299			1,919			(1,447		)	96			(213		)	654
Reserve for unfunded commitments at end of period	$	3,370		$	3,733		$	1,596		$	168		$	2,934		$	11,801
Allowance on loans individually evaluated for impairment	$	20		$	407		$	—		$	—		$	3		$	430
Allowance on loans collectively evaluated for impairment	26,732			24,048			5,949			2,678			16,337			75,744
Loans, net of unearned income:
Balance at end of period	$	3,676,811		$	2,452,521		$	872,866		$	527,694		$	2,138,822		$	9,668,714
Balance at end of period individually evaluated for impairment	7,013			3,988			—			—			699			11,700
Balance at end of period collectively evaluated for impairment	3,669,798			2,448,533			872,866			527,694			2,138,123			9,657,014

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	2013
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	31,298		$	20,605		$	6,812	$	1,583		$	13,913		$	74,211
(Reversal of) Provision for loan losses	(5,919		)	3,870			66		758			8,053			6,828
Transfer of balance to the RULC	(2,939		)	(3,497		)	—		(40		)	(3,352		)	(9,828		)
Loans charged off	(2,908		)	(516		)	—		(519		)	(6,743		)	(10,686		)
Recoveries	3,340			377			—		764			2,336			6,817
Allowance for loan losses at end of period	$	22,872		$	20,839		$	6,878	$	2,546		$	14,207		$	67,342
Reserve for unfunded commitments at beginning of period	$	—		$	—		$	—	$	—		$	—		$	—
Transfer of balance from the allowance for loan losses	2,939			3,497			—		40			3,352			9,828
Provision for unfunded lending commitments	132			(1,683		)	3,043		32			(205		)	1,319
Reserve for unfunded commitments at end of period	$	3,071		$	1,814		$	3,043	$	72		$	3,147		$	11,147
Allowance on loans individually evaluated for impairment	$	8		$	841		$	—	$	180		$	—		$	1,029
Allowance on loans collectively evaluated for impairment	22,864			19,998			6,878		2,366			14,207			66,313
Loans, net of unearned income:
Balance at end of period	$	3,054,100		$	2,234,173		$	752,682	$	414,372		$	1,832,994		$	8,288,321
Balance at end of period individually evaluated for impairment	8,705			15,812			—		1,407			258			26,182
Balance at end of period collectively evaluated for impairment	3,045,395			2,218,361			752,682		412,965			1,832,736			8,262,139

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A summary of changes in the allowance for loan losses for acquired loans, by loan portfolio type, for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	29,949		$	3,265		$	51	$	6,484		$	14,208		$	53,957
Provision for (Reversal of) loan losses	2,182			(122		)	74		2,126			(1,063		)	3,197
Increase (Decrease) in FDIC loss share receivable	757			(49		)	—		(235		)	(1,833		)	(1,360		)
Transfer of balance to OREO	174			(170		)	—		(541		)	(684		)	(1,221		)
Loans charged off	(7,810		)	(105		)	—		—			(2,822		)	(10,737		)
Recoveries	727			—			—		7			—			734
Allowance for loan losses at end of period	$	25,979		$	2,819		$	125	$	7,841		$	7,806		$	44,570
Allowance on loans individually evaluated for impairment	$	—		$	41		$	—	$	—		$	45		$	86
Allowance on loans collectively evaluated for impairment	25,979			2,778			125		7,841			7,761			44,484
Loans, net of unearned income:
Balance at end of period	$	1,569,449		$	492,476		$	3,589	$	501,296		$	570,098		$	3,136,908
Balance at end of period individually evaluated for impairment	720			164			—		—			458			1,342
Balance at end of period collectively evaluated for impairment	1,149,315			450,652			3,589		360,252			447,048			2,410,856
Balance at end of period acquired with deteriorated credit quality	419,414			41,660			—		141,044			122,592			724,710

	2014
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	42,026		$	6,641		$	—	$	10,889		$	16,176		$	75,732
Provision for loan losses	665			536			51		1,296			2,238			4,786
Increase (Decrease) in FDIC loss share receivable	227			509			—		(3,854		)	(1,142		)	(4,260		)
Transfer of balance to OREO	(1,897		)	(2,030		)	—		(1,719		)	(1,677		)	(7,323		)
Loans charged off	(11,201		)	(2,451		)	—		(232		)	(1,659		)	(15,543		)
Recoveries	129			60			—		104			272			565
Allowance for loan losses at end of period	$	29,949		$	3,265		$	51	$	6,484		$	14,208		$	53,957
Allowance on loans individually evaluated for impairment	$	—		$	—		$	—	$	—		$	—		$	—
Allowance on loans collectively evaluated for impairment	29,949			3,265			51		6,484			14,208			53,957
Loans, net of unearned income:
Balance at end of period	$	684,968		$	119,174		$	7,742	$	552,603		$	407,843		$	1,772,330
Balance at end of period individually evaluated for impairment	—			—			—		—			—			—
Balance at end of period collectively evaluated for impairment	169,338			60,584			7,742		402,347			265,168			905,179
Balance at end of period acquired with deteriorated credit quality	515,630			58,590			—		150,256			142,675			867,151

95

	2013
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	107,269		$	13,246		$	23,108		$	33,769		$	177,392
(Reversal of) Provision for loan losses	(1,286		)	(1,146		)	390			359			(1,683		)
(Decrease) Increase in FDIC loss share receivable	(28,238		)	(5,032		)	(4,896		)	(17,919		)	(56,085		)
Transfer of balance to OREO	(19,953		)	(427		)	(7,713		)	(33		)	(28,126		)
Loans charged off	(15,795		)	—			—			—			(15,795		)
Recoveries	29			—			—			—			29
Allowance for loan losses at end of period	$	42,026		$	6,641		$	10,889		$	16,176		$	75,732
Allowance on loans individually evaluated for impairment	$	—		$	—		$	—		$	—		$	—
Allowance on loans collectively evaluated for impairment	42,026			6,641			10,889			16,176			75,732
Loans, net of unearned income:
Balance at end of period	$	732,401		$	90,062		$	172,160		$	209,075		$	1,203,698
Balance at end of period individually evaluated for impairment	—			—			—			—			—
Balance at end of period collectively evaluated for impairment	393,487			37,430			162,248			157,744			750,909
Balance at end of period acquired with deteriorated credit quality	338,914			52,632			9,912			51,331			452,789

Portfolio Segment Risk Factors

Commercial real estate loans include loans to commercial customers for long-term financing of land and buildings or for land development or construction of a building. These loans are repaid through revenues from operations of the businesses, rents of properties, sales of properties and refinances. Commercial and industrial loans represent loans to commercial customers to finance general working capital needs, equipment purchases and other projects where repayment is derived from cash flows resulting from business operations. The Company originates commercial business loans on a secured and, to a lesser extent, unsecured basis.

Residential mortgage loans consist of loans to consumers to finance a primary residence. The vast majority of the residential mortgage loan portfolio is comprised of 1-4 family mortgage loans secured by properties located in the Company's market areas and originated under terms and documentation that permit their sale in the secondary market.

Consumer loans are offered by the Company in order to provide a full range of retail financial services to its customers and include home equity, indirect automobile, credit card and other direct consumer installment loans. The Company originates substantially all of its consumer loans in its primary market areas. Loans in the consumer segment are sensitive to unemployment and other key consumer economic measures.

Credit Quality

The Company utilizes an asset risk classification system in accordance with guidelines established by the Federal Reserve Board as part of its efforts to monitor commercial asset quality. “Special mention” loans are defined as loans where known information about possible credit problems of the borrower cause management to have some doubt as to the ability of these borrowers to comply with the present loan repayment terms and which may result in future disclosure of these loans as non-performing. For assets with identified credit issues, the Company has two primary classifications for problem assets: “substandard” and “doubtful.”

Substandard assets have one or more defined weaknesses and are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Doubtful assets have the weaknesses of substandard assets with the additional characteristic that the weaknesses make collection or liquidation in full satisfaction of the loan balance outstanding questionable, which makes probability of loss based on currently existing facts, conditions, and values higher. Loans classified as “Pass” do not meet the criteria set forth for special mention, substandard, or doubtful classification and are not considered criticized. Asset risk classifications are determined at origination or acquisition and reviewed on an ongoing basis. Risk

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classifications are changed if, in the opinion of management, the risk profile of the customer has changed since the last review of the loan relationship.

The Company’s investment in loans by credit quality indicator is presented in the following tables. The tables below further segregate the Company’s loans between loans that were originated by the Company (legacy loans) and acquired loans. Loan premiums/discounts in the tables below represent the adjustment of non-covered acquired loans to fair value at the acquisition date, as adjusted for income accretion and changes in cash flow estimates in subsequent periods. Asset risk classifications for commercial loans reflect the classification as of December 31, 2015 and 2014, respectively. Credit quality information in the tables below includes loans acquired at the gross loan balance, prior to the application of premiums/discounts, at December 31, 2015 and 2014.

Loan delinquency is the primary credit quality indicator that the Company utilizes to monitor consumer asset quality.

	Legacy loans
	December 31, 2015										December 31, 2014
(Dollars in thousands)	Pass		Special Mention		Sub- standard		Doubtful		Total		Pass		Special Mention		Sub- standard		Doubtful		Total
Commercial real estate - Construction	$	634,889	$	160	$	1,432	$	—	$	636,481	$	483,930	$	240	$	69	$	—	$	484,239
Commercial real estate - Other	3,806,528		21,877		37,001		2,175		3,867,581		3,120,370		49,847		22,193		162		3,192,572
Commercial and industrial	2,911,396		14,826		19,888		5,992		2,952,102		2,414,293		7,330		28,965		1,933		2,452,521
Energy-related	531,657		67,937		74,272		3,311		677,177		872,842		—		24		—		872,866
Total	$	7,884,470	$	104,800	$	132,593	$	11,478	$	8,133,341	$	6,891,435	$	57,417	$	51,251	$	2,095	$	7,002,198

	Legacy loans
	December 31, 2015						December 31, 2014
(Dollars in thousands)	Current		30+ Days Past Due		Total		Current		30+ Days Past Due		Total
Residential mortgage	$	676,347	$	17,676	$	694,023	$	508,789	$	18,905	$	527,694
Consumer - Home equity	1,565,596		10,047		1,575,643		1,278,865		12,111		1,290,976
Consumer - Indirect automobile	242,328		3,886		246,214		392,504		4,262		396,766
Consumer - Credit card	76,360		901		77,261		71,297		1,448		72,745
Consumer - Other	460,594		3,444		464,038		375,853		2,482		378,335
Total	$	3,021,225	$	35,954	$	3,057,179	$	2,627,308	$	39,208	$	2,666,516

	Acquired loans
	December 31, 2015															December 31, 2014
(Dollars in thousands)	Pass		Special Mention		Sub-standard		Doubtful		Loss		Discount			Total		Pass		Special Mention		Sub-standard		Doubtful		Discount			Total
Commercial real estate - Construction	$	116,539	$	1,681	$	8,803	$	771	$	—	$	(2,368	)	$	125,426	$	58,849	$	3,934	$	12,632	$	—	$	(4,482	)	$	70,933
Commercial real estate - Other	1,383,409		26,080		79,119		6,124		111		(50,820		)	1,444,023		530,958		33,216		100,391		—		(50,530		)	614,035
Commercial and industrial	473,241		8,376		16,510		1,206		43		(6,900		)	492,476		109,593		2,256		14,082		257		(7,014		)	119,174
Energy-related	2,166		55		170		1,198		—		—			3,589		7,731		—		11		—		—			7,742
Total	$	1,975,355	$	36,192	$	104,602	$	9,299	$	154	$	(60,088	)	$	2,065,514	$	707,131	$	39,406	$	127,116	$	257	$	(62,026	)	$	811,884

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	Acquired loans
	December 31, 2015									December 31, 2014
(Dollars in thousands)	Current		30+ Days Past Due		Premium (discount)			Total		Current		30+ Days Past Due		Premium (discount)			Total
Residential mortgage	$	506,103	$	24,752	$	(29,559	)	$	501,296	$	559,180	$	33,916	$	(40,493	)	$	552,603
Consumer - Home equity	503,635		16,381		(29,492		)	490,524		315,788		26,350		(32,009		)	310,129
Consumer - Indirect automobile	72		12		—			84		393		39		(40		)	392
Consumer - Other	79,732		1,475		(1,717		)	79,490		95,266		3,572		(1,516		)	97,322
Total	$	1,089,542	$	42,620	$	(60,768	)	$	1,071,394	$	970,627	$	63,877	$	(74,058	)	$	960,446

Legacy Impaired Loans

Information on the Company’s investment in legacy impaired loans, which include all TDRs and all other non-accrual loans, is presented in the following tables as of and for the periods indicated.  Legacy non-accrual mortgage and consumer loans, and commercial loans below the Company’s specific threshold, are included for purposes of this disclosure although such loans are not evaluated or measured individually for impairment for purposes of determining the allowance for loan losses.

	December 31, 2015
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	16,145	$	16,145	$	—		$	15,864	$	315
Commercial and industrial	14,340		14,340		—			18,839		1,148
Energy-related	—		—		—			—		—
Consumer - Home equity	730		730		—			533		22
Consumer - Other	66		66		—			66		5
With an allowance recorded:
Commercial real estate	12,500		13,753		(1,253		)	14,055		554
Commercial and industrial	5,985		6,262		(277		)	7,352		331
Energy-related	11,319		13,444		(2,125		)	14,339		471
Residential mortgage	13,679		13,743		(64		)	14,086		82
Consumer - Home equity	8,196		8,559		(363		)	7,554		129
Consumer - Indirect automobile	1,171		1,181		(10		)	1,613		44
Consumer - Credit card	386		394		(8		)	881		—
Consumer - Other	876		899		(23		)	1,039		44
Total	$	85,393	$	89,516	$	(4,123	)	$	96,221	$	3,145
Total commercial loans	$	60,289	$	63,944	$	(3,655	)	$	70,449	$	2,819
Total mortgage loans	13,679		13,743		(64		)	14,086		87
Total consumer loans	11,425		11,829		(404		)	11,686		244

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	December 31, 2014
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	6,680	$	6,680	$	—		$	6,703	$	132
Commercial and industrial	2,483		2,483		—			2,873		57
Consumer - Home equity	682		682		—			696		19
With an allowance recorded:
Commercial real estate	1,044		1,069		(25		)	1,134		38
Commercial and industrial	1,209		1,617		(408		)	2,113		23
Energy-related	27		27		—			28		1
Residential mortgage	14,111		14,363		(252		)	14,263		110
Consumer - Home equity	7,121		7,165		(44		)	7,544		43
Consumer - Indirect automobile	1,410		1,419		(9		)	2,016		51
Consumer - Credit card	1,012		1,032		(20		)	797		—
Consumer - Other	781		790		(9		)	1,009		39
Total	$	36,560	$	37,327	$	(767	)	$	39,176	$	513
Total commercial loans	$	11,443	$	11,876	$	(433	)	$	12,851	$	251
Total mortgage loans	14,111		14,363		(252		)	14,263		110
Total consumer loans	11,006		11,088		(82		)	12,062		152

	December 31, 2013
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	8,567	$	8,567	$	—		$	10,443	$	43
Commercial and industrial	13,256		13,256		—			11,074		170
Consumer - Home equity	258		258		—			281		1
With an allowance recorded:
Commercial real estate	1,268		1,284		(16		)	4,414		8
Commercial and industrial	1,927		2,770		(843		)	2,892		100
Residential mortgage	11,408		11,645		(237		)	9,675		98
Consumer - Home equity	6,506		6,550		(44		)	7,593		93
Consumer - Indirect automobile	1,267		1,275		(8		)	2,090		55
Consumer - Credit card	404		411		(7		)	418		—
Consumer - Other	481		485		(4		)	765		19
Total	$	45,342	$	46,501	$	(1,159	)	$	49,645	$	587
Total commercial loans	$	25,018	$	25,877	$	(859	)	$	28,823	$	321
Total mortgage loans	11,408		11,645		(237		)	9,675		98
Total consumer loans	8,916		8,979		(63		)	11,147		168

As of December 31, 2015 and 2014, the Company was not committed to lend a material amount of additional funds to any customer whose loan was classified as impaired or as a troubled debt restructuring.

99

NOTE 7 – LOSS SHARING AGREEMENTS AND FDIC LOSS SHARE RECEIVABLE

Loss Sharing Agreements

Since 2009, the Company has acquired certain assets and liabilities of six failed banks. Substantially all of the loans and foreclosed real estate acquired through these transactions were covered by loss share agreements between the FDIC and IBERIABANK, which afforded IBERIABANK loss protection.

During the reimbursable loss periods, the FDIC will cover 80% of covered loan and foreclosed real estate losses up to certain thresholds for the six acquisitions, and 95% of losses that exceed contractual thresholds for three acquisitions. The reimbursable loss periods, excluding single family residential assets, ended in 2014 for three acquisitions, ended during 2015 for one acquisition and will end during 2016 for two acquisitions. The reimbursable loss periods for single family residential assets will end in 2019 for three acquisitions, in 2020 for one acquisition, and in 2021 for two acquisitions. To the extent that loss share coverage ends prior to triggering events on covered assets that would enable the Company to collect these amounts from the FDIC, future impairments may be required.

In addition, all covered assets, excluding single family residential assets, have a three year recovery period, which begins upon expiration of the reimbursable loss period. During the recovery periods, the Company must reimburse the FDIC for its share of any recovered losses, net of certain expenses, consistent with the covered loss reimbursement rates in effect during the recovery periods.

FDIC loss share receivables

The Company recorded indemnification assets in the form of FDIC loss share receivables as of the acquisition date of each of the six banks covered by loss share agreements. At acquisition, the indemnification assets represented the fair value of the expected cash flows to be received from the FDIC under the loss share agreements. Subsequent to acquisition, the FDIC loss share receivables are updated to reflect changes in actual and expected amounts collectible adjusted for amortization.

The following is a summary of FDIC loss share receivables year-to-date activity:

	December 31
(Dollars in thousands)	2015			2014
Balance at beginning of period	$	69,627		$	162,312
Change due to (reversal of) loan loss provision recorded on FDIC covered loans	(1,360		)	(4,260		)
Amortization	(23,500		)	(74,617		)
(Submission of reimbursable losses) recoveries payable to the FDIC	(2,444		)	3,282
Impairment	—			(5,121		)
Changes due to a change in cash flow assumptions on OREO and other changes	(2,445		)	(11,969		)
Balance at end of period	$	39,878		$	69,627

FDIC loss share receivables collectibility assessment

The Company assesses the FDIC loss share receivables for collectibility on a quarterly basis. Based on the collectibility analysis completed for the year ended December 31, 2015, the Company concluded that the $39.9 million FDIC loss share receivable is fully collectible as of December 31, 2015.

2014 and 2013 Impairments of FDIC loss share receivables

Based on improving economic trends, their impact on the amount and timing of expected future cash flows, and delays in the foreclosure process, during the loss share receivable collectibility assessment completed for the years ended December 31, 2014 and 2013, the Company concluded that certain expected losses were probable of not being collected from either the FDIC or the customer because such projected losses were no longer expected to occur or were expected to occur beyond the reimbursable loss periods specified within the loss share agreements. Management deemed an impairment charge necessary for the year ended December 31, 2014 in the amount of $5.1 million attributable to losses on OREO transactions that moved beyond the loss share term.

On April 10, 2013, management concluded that an impairment charge of $31.8 million was required and was recognized in the Company's consolidated financial statements during the three-month period ended March 31, 2013.

100

NOTE 8 –TRANSFERS AND SERVICING OF FINANCIAL ASSETS (INCLUDING MORTGAGE BANKING ACTIVITY)

Commercial Banking Activity

The unpaid principal balances of loans serviced for others were $888.4 million and $533.8 million at December 31, 2015 and 2014, respectively. Custodial escrow balances maintained in connection with the foregoing portfolio of loans serviced for others, and included in demand deposits, were immaterial at December 31, 2015 and 2014.

Mortgage Banking Activity

IBERIABANK through its subsidiary, IMC, originates mortgage loans for sale into the secondary market. The loans originated primarily consist of residential first mortgages that conform to standards established by the GSEs, but can also consist of junior lien loans secured by residential property. These sales are primarily to private companies that are unaffiliated with the GSEs on a servicing-released basis. Changes to the carrying amount of mortgage loans held for sale at December 31 are presented in the following table.

(Dollars in thousands)	2015			2014			2013
Balance at beginning of period	$	140,072		$	128,442		$	267,475
Originations and purchases	2,464,588			1,675,538			2,116,460
Sales, net of gains	(2,432,979		)	(1,657,409		)	(2,255,493		)
Other	(5,434		)	(6,499		)	—
Balance at end of period	$	166,247		$	140,072		$	128,442

The following table details the components of mortgage income for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Fair value changes of derivatives and mortgage loans held for sale:
Mortgage loans held for sale and derivatives	$	2,216		$	631		$	(4,822	)
Derivative settlements, net	(5,017		)	(8,743		)	3,100
Gains on sales	83,131			59,156			65,393
Servicing and other income, net	792			753			526
	$	81,122		$	51,797		$	64,197

Mortgage Servicing Rights

Mortgage servicing rights are recorded at the lower of cost or market value in “other assets” on the Company's consolidated balance sheets and amortized over the remaining servicing life of the loans, with consideration given to prepayment assumptions. Mortgage servicing rights had the following carrying values as of the periods indicated:

	December 31, 2015							December 31, 2014
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
(Dollars in thousands)
Mortgage servicing rights	$	6,104	$	(2,320	)	$	3,784	$	4,751	$	(1,253	)	$	3,498

NOTE 9 – PREMISES AND EQUIPMENT

Premises and equipment consisted of the following at December 31:

(Dollars in thousands)	2015			2014
Land	$	84,438		$	75,916
Buildings	245,934			232,727
Furniture, fixtures and equipment	140,031			128,388
Total premises and equipment	470,403			437,031
Accumulated depreciation	(146,501		)	(129,872		)
Total premises and equipment, net	$	323,902		$	307,159

101

Depreciation expense was $22.2 million, $19.4 million, and $19.6 million, for the years ended December 31, 2015, 2014, and 2013, respectively.

The Company actively engages in leasing office space available in buildings it owns. Leases have different terms ranging from monthly rental to six years. For the year ended December 31, 2015, income from these leases averaged $0.2 million per month. Total lease income for the years ended December 31, 2015, 2014, and 2013 was $2.4 million, $1.6 million, and $1.5 million, respectively. Income from leases is reported as a reduction in occupancy and equipment expense. The total allocated cost of the portion of the buildings held for lease at December 31, 2015 and 2014 was $8.2 million and $7.6 million, respectively, with related accumulated depreciation of $2.6 million and $2.4 million, respectively.

The Company leases certain branch and corporate offices, land and ATM facilities through non-cancelable operating leases with terms that range from one to 50 years, some of which contain renewal options and escalation clauses under various terms.Rent expense for the years ended December 31, 2015, 2014, and 2013 totaled $15.4 million, $10.9 million, and $11.4 million, respectively.

Minimum future annual rent commitments under lease agreements for the periods indicated are as follows:

(Dollars in thousands)
2016	$	16,957
2017	14,751
2018	13,491
2019	11,952
2020	10,735
2021 and thereafter	41,054
	$	108,940

NOTE 10 – GOODWILL AND OTHER ACQUIRED INTANGIBLE ASSETS

Goodwill

Changes to the carrying amount of goodwill by reportable segment for the years ended December 31, 2015 and 2014 are provided in the following table.

(Dollars in thousands)	IBERIABANK		IMC		LTC		Total
Balance, December 31, 2013	$	373,905	$	23,178	$	4,789	$	401,872
Goodwill acquired during the year	115,278		—		376		115,654
Balance, December 31, 2014	$	489,183	$	23,178	$	5,165	$	517,526
Goodwill acquired during the year	207,077		—		—		207,077
Balance, December 31, 2015	$	696,260	$	23,178	$	5,165	$	724,603

The goodwill acquired in 2015 was a result of the Florida Bank, Old Florida, and Georgia Commerce acquisitions. The goodwill acquired in 2014 was a result of the Trust One-Memphis, Teche, First Private, The Title Company, LLC and Louisiana Abstract and Title, LLC acquisitions. See Note 3 for further information.

The Company performed the required annual goodwill impairment test as of October 1, 2015. The Company’s annual impairment test did not indicate impairment in any of the Company’s reporting units as of the testing date. Subsequent to the testing date, management has evaluated the events and changes that could indicate that goodwill might be impaired and concluded that a subsequent test is not required.

Title Plant

The Company held title plant assets recorded in “other assets” on the consolidated balance sheets totaling $6.7 million at both December 31, 2015 and 2014. No events or changes in circumstances occurred during 2015 or 2014 to suggest the carrying value of the title plant was not recoverable.

102

Intangible assets subject to amortization

Definite-lived intangible assets had the following carrying values included in “other assets” on the Company’s consolidated balance sheets as of December 31:

	2015							2014
(Dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Core deposit intangibles	$	74,001	$	(43,957	)	$	30,044	$	55,949	$	(36,354	)	$	19,595
Customer relationship intangible asset	1,348		(984		)	364		1,348		(822		)	526
Non-compete agreement	100		(79		)	21		163		(82		)	81
Other intangible assets	205		(114		)	91		205		(46		)	159
Total	$	75,654	$	(45,134	)	$	30,520	$	57,665	$	(37,304	)	$	20,361

The related amortization expense of intangible assets is as follows:

(Dollars in thousands)	Amount
Aggregate amortization expense for the years ended December 31:
2013	$	4,720
2014	5,807
2015	7,811

(Dollars in thousands)
Estimated amortization expense for the years ended December 31:
2016	$	8,338
2017	6,775
2018	5,786
2019	5,066
2020	3,613
2021 and thereafter	942

NOTE 11 –DERIVATIVE INSTRUMENTS AND OTHER HEDGING ACTIVITIES

The Company enters into derivative financial instruments to manage interest rate risk and other exposures such as liquidity and credit risk, as well as to facilitate customer transactions. The primary types of derivatives used by the Company include interest rate swap agreements, foreign exchange contracts, interest rate lock commitments, forward sales commitments, and written and purchased options. All derivative instruments are recognized on the consolidated balance sheets as other assets or other liabilities at fair value, as required by ASC Topic 815, Derivatives and Hedging.

For cash flow hedges, the effective portion of the gain or loss related to the derivative instrument is initially reported as a component of other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings or when the hedge is terminated. The ineffective portion of the gain or loss is reported in earnings immediately. In applying hedge accounting for derivatives, the Company establishes and documents a method for assessing the effectiveness of the hedging derivative and a measurement approach for determining the ineffective aspect of the hedge upon the inception of the hedge. The Company has designated interest rate swaps in a cash flow hedge to convert forecasted variable interest payments to a fixed rate on its junior subordinated debt and has concluded that the forecasted transactions are probable of occurring.

For derivative instruments that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately.

103

Information pertaining to outstanding derivative instruments is as follows:

	Balance Sheet Location	Asset Derivatives Fair Value				Balance Sheet Location	Liability Derivatives Fair Value
(Dollars in thousands)		December 31, 2015		December 31, 2014			December 31, 2015		December 31, 2014
Derivatives designated as hedging instruments under ASC Topic 815:
Interest rate contracts	Other assets	$	58	$	—	Other liabilities	$	—	$	—
Total derivatives designated as hedging instruments under ASC Topic 815		$	58	$	—		$	—	$	—
Derivatives not designated as hedging instruments under ASC Topic 815:
Interest rate contracts	Other assets	$	18,077	$	15,434	Other liabilities	$	18,077	$	15,434
Foreign exchange contracts	Other assets	156		—		Other liabilities	134		—
Forward sales contracts	Other assets	1,588		25		Other liabilities	474		2,556
Written and purchased options	Other assets	10,607		17,444		Other liabilities	6,254		13,364
Total derivatives not designated as hedging instruments under ASC Topic 815		$	30,428	$	32,903		$	24,939	$	31,354
Total		$	30,486	$	32,903		$	24,939	$	31,354
		Asset Derivatives Notional Amount					Liability Derivatives Notional Amount
(Dollars in thousands)		December 31, 2015		December 31, 2014			December 31, 2015		December 31, 2014
Derivatives designated as hedging instruments under ASC Topic 815:
Interest rate contracts		$	108,500	$	—		$	—	$	—
Total derivatives designated as hedging instruments under ASC Topic 815		$	108,500	$	—		$	—	$	—
Derivatives not designated as hedging instruments under ASC Topic 815:
Interest rate contracts		$	590,334	$	444,703		$	590,334	$	444,703
Foreign exchange contracts		4,392		—			4,392		—
Forward sales contracts		223,841		15,897			173,430		391,992
Written and purchased options		328,210		362,580			181,949		225,741
Total derivatives not designated as hedging instruments under ASC Topic 815		$	1,146,777	$	823,180		$	950,105	$	1,062,436
Total		$	1,255,277	$	823,180		$	950,105	$	1,062,436

104

The Company is party to collateral agreements with certain derivative counterparties. Such agreements require that the Company maintain collateral based on the fair values of individual derivative transactions. In the event of default by the Company, the counterparty would be entitled to the collateral.

At December 31, 2015 and 2014, the Company was required to post $21.8 million and $11.5 million, respectively, in cash as collateral for its derivative transactions, which are included in "interest-bearing deposits in banks" on the Company’s consolidated balance sheets. The Company does not anticipate additional assets will be required to be posted as collateral, nor does it believe additional assets would be required to settle its derivative instruments immediately if contingent features were triggered at December 31, 2015. The Company’s master netting agreements represent written, legally enforceable bilateral agreements that (1) create a single legal obligation for all individual transactions covered by the master agreement and (2) in the event of default, provide the non-defaulting counterparty the right to accelerate, terminate, and close-out on a net basis all transactions under the agreement and to promptly liquidate or set-off collateral posted by the defaulting counterparty. As permitted by U.S. GAAP, the Company does not offset fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral against recognized fair value amounts of derivatives executed with the same counterparty under a master netting agreement. The following table reconciles the gross amounts presented in the consolidated balance sheets to the net amounts that would result in the event of offset.

	December 31, 2015
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet					Net
(Dollars in thousands)			Derivatives		Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts designated as hedging instruments	$	58	$	—	$	(45	)	$	13
Interest rate contracts not designated as hedging instruments	18,058		—		—			18,058
Written and purchased options	6,277		—		—			6,277
Total derivative assets subject to master netting arrangements	$	24,393	$	—	$	(45	)	$	24,348
Derivative liabilities
Interest rate contracts not designated as hedging instruments	18,058		—		(9,428		)	8,630
Total derivative liabilities subject to master netting arrangements	$	18,058	$	—	$	(9,428	)	$	8,630

(1) Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.

105

	December 31, 2014
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet					Net
(Dollars in thousands)			Derivatives		Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts designated as hedging instruments	$	—	$	—	$	—		$	—
Interest rate contracts not designated as hedging instruments	15,411		—		—			15,411
Written and purchased options	13,387		—		—			13,387
Total derivative assets subject to master netting arrangements	$	28,798	$	—	$	—		$	28,798
Derivative liabilities
Interest rate contracts not designated as hedging instruments	15,411		—		(3,735		)	11,676
Total derivative liabilities subject to master netting arrangements	$	15,411	$	—	$	(3,735	)	$	11,676

(1) Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.

During the years ended December 31, 2015 and 2014, the Company has not reclassified into earnings any gain or loss as a result of the discontinuance of cash flow hedges, because it was probable the original forecasted transaction would not occur by the end of the originally specified term.

At December 31, 2015, the Company does not expect to reclassify any amount from accumulated other comprehensive income into interest income over the next twelve months for derivatives that will be settled.

At December 31, 2015, 2014, and 2013, and for the years then ended, information pertaining to the effect of the hedging instruments on the consolidated financial statements is as follows:

																Location of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
			Amount of Gain (Loss) Recognized in OCI net of taxes (Effective Portion)					Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
(Dollars in thousands)
			For the Years Ended December 31
Derivatives in ASC Topic 815 Cash Flow Hedging Relationships			2015	2014		2013				2015	2014		2013				2015		2014			2013
	Interest rate contracts	$	38	$	—	$	619	Other income (expense)	$	—	$	—	$	(391	)	Other income (expense)	$	—	$	(1	)	$	1
Total		$	38	$	—	$	619		$	—	$	—	$	(391	)		$	—	$	(1	)	$	1

106

Information pertaining to the effect of derivatives not designated as hedging instruments on the consolidated financial statements as of December 31, is as follows:

	Location of Gain (Loss) Recognized in Income on Derivatives	Amount of Gain (Loss) Recognized in Income on Derivatives
(Dollars in thousands)		2015			2014			2013
Interest rate contracts	Other income	$	4,143		$	2,513		$	2,991
Foreign exchange contracts	Other income	22			—			—
Forward sales contracts	Mortgage Income	(2,947		)	(3,225		)	(1,716		)
Written and purchased options	Mortgage Income	274			(5,739		)	(3,032		)
Total		$	1,492		$	(6,451	)	$	(1,757	)

At December 31, additional information pertaining to outstanding interest rate swap agreements not designated as hedging instruments is as follows:

(Dollars in thousands)	2015			2014			2013
Weighted average pay rate	3.2		%	2.9		%	3.0		%
Weighted average receive rate	0.9		%	0.4		%	0.2		%
Weighted average maturity in years	7.5 years			7.7 years			7.6 years
Unrealized gain (loss) relating to interest rate swaps	$	—		$	—		$	—

NOTE 12 – DEPOSITS

Deposits at December 31 are summarized as follows:

(Dollars in thousands)	2015		2014
Non-interest-bearing deposits	$	4,352,229	$	3,195,430
Negotiable order of withdrawal (NOW)	2,974,176		2,462,841
Money market deposits accounts (MMDA)	6,010,882		4,168,504
Savings deposits	716,838		577,513
Certificates of deposit and other time deposits	2,124,623		2,116,237
	$	16,178,748	$	12,520,525

Total time deposits summarized by denomination at December 31 are as follows:

(Dollars in thousands)	2015		2014
Time deposits less than $250,000	$	1,456,804	$	1,767,448
Time deposits greater than $250,000	667,819		348,789
	$	2,124,623	$	2,116,237

A schedule of maturities of all time deposits as of December 31, 2015 is as follows:

(Dollars in thousands)
Years ending December 31
2016	$	1,380,655
2017	423,866
2018	112,915
2019	64,170
2020	81,418
2021 and thereafter	61,599
	$	2,124,623

NOTE 13 – SHORT-TERM BORROWINGS

107

Short-term borrowings at December 31 are summarized as follows:

(Dollars in thousands)	2015		2014
Federal Home Loan Bank advances	$	110,000	$	603,000
Securities sold under agreements to repurchase	216,617		242,742
	$	326,617	$	845,742

Securities sold under agreements to repurchase, which are classified as secured borrowings, generally mature daily and are reflected at the amount of cash received in connection with the transaction. The Company may be required to provide additional collateral based on the fair value of the underlying securities.

Additional information on the Company’s short-term borrowings for the years indicated is as follows:

(Dollars in thousands)	2015			2014			2013
Outstanding at December 31	$	326,617		$	845,742		$	680,344
Maximum month-end outstanding balance	798,933			1,034,741			680,344
Average daily outstanding balance	426,011			782,033			303,352
Average rate during the year	0.18		%	0.17		%	0.16		%
Average rate at year end	0.20		%	0.18		%	0.15		%

The Company has various funding arrangements with commercial banks providing up to$180.0 millionin the form of Federal funds and other lines of credit. At December 31, 2015, there werenobalances outstanding on these lines and all of the funding was available to the Company.

108

NOTE 14 – LONG-TERM DEBT

Long-term debt at December 31 is summarized as follows:

(Dollars in thousands)	2015		2014
IBERIABANK:
Federal Home Loan Bank notes, 0.903% to 7.040%	$	136,628	$	210,549
Notes payable - Investment fund contribution, 7 to 40 year term, 0.50% to 5.00% fixed	83,709		80,843
	220,337		291,392
IBERIABANK Corporation (junior subordinated debt):
Statutory Trust I, 3 month LIBOR (1), plus 3.25%, issued November 2002	10,310		10,310
Statutory Trust II, 3 month LIBOR (1), plus 3.15%, issued June 2003	10,310		10,310
Statutory Trust III, 3 month LIBOR (1), plus 2.00%, issued September 2004	10,310		10,310
Statutory Trust IV, 3 month LIBOR (1), plus 1.60%, issued October 2006	15,464		15,464
American Horizons Statutory Trust I, 3 month LIBOR (1), plus 3.15%, assumed January 2005	6,186		6,186
Statutory Trust V, 3 month LIBOR (1), plus 1.435%, issued June 2007	10,310		10,310
Statutory Trust VI, 3 month LIBOR (1), plus 2.75%, issued November 2007	12,372		12,372
Statutory Trust VII, 3 month LIBOR (1), plus 2.54%, issued November 2007	13,403		13,403
Statutory Trust VIII, 3 month LIBOR (1), plus 3.50%, issued March 2008	7,217		7,217
OMNI Trust I, 3 month LIBOR (1), plus 3.30%, assumed May 2011	8,248		8,248
OMNI Trust II, 3 month LIBOR (1), plus 2.79%, assumed May 2011	7,732		7,732
GA Commerce Trust II, 3 month LIBOR (1), plus 1.64%, assumed May 2015	8,248		—
	120,110		111,862
	$	340,447	$	403,254

(1) The interest rate on the Company’s long-term debt indexed to LIBOR is based on the 3-month LIBOR rate. The 3-month LIBOR rate was0.61%and 0.26% at December 31, 2015 and 2014, respectively.

Outstanding FHLB advances are a mix of bullet and amortizing structures. Amortizing FHLB advances are amortized over periods ranging from 2.5 to 20 years, and have a balloon feature at maturity. Advances are collateralized by a blanket pledge of eligible loans, subject to contractual adjustments which reduce the borrowing base, as well as a secondary pledge of FHLB stock and FHLB demand deposits, the amount of which can exceed the amounts borrowed based on contractually required adjustments. Total additional advances available from the FHLB at December 31, 2015 were$4.6 billionunder the blanket floating lien including $1.2 billion from pledges of investment securities. The weighted average advance rate was 3.79%and 3.24% at December 31, 2015 and 2014, respectively.

Junior subordinated debt consists of a total of $120.1 million in Junior Subordinated Deferrable Interest Debentures of the Company issued to statutory trusts that were funded by the issuance of floating rate capital securities of the trusts. The terms of the junior subordinated debt are 30 years, and they are callable at par by the Company any time after 5 years. Interest is payable quarterly and may be deferred at any time at the election of the Company for up to 20 consecutive quarterly periods. During a deferral period, the Company is subject to certain restrictions, including being prohibited from declaring and paying dividends to its common shareholders.

Effective January 1, 2015, 75% of the Company's junior subordinated debt was excluded from Tier 1 capital for regulatory purposes. The remaining 25% will be excluded effective January 1, 2016.

109

Advances and long-term debt at December 31, 2015 have maturities or call dates in future years as follows:

(Dollars in thousands)
2016	$	34,789
2017	61,899
2018	21,057
2019	7,865
2020	16,308
2021 and thereafter	198,529
	$	340,447

NOTE 15 – INCOME TAXES

The provision for income tax expense consists of the following for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Current expense	$	67,025		$	69,612		$	62,468
Deferred expense (benefit)	4,551			(25,027		)	(35,930		)
Tax credits	(11,268		)	(12,012		)	(11,690		)
ASU 2014-01 Amortization on Low Income Housing Tax Credits	2,023			1,005			251
Tax benefits attributable to items charged to equity and goodwill	1,763			2,105			1,034
	$	64,094		$	35,683		$	16,133

There was a balance receivable of $13 million and $2 million for federal and state income taxes at December 31, 2015 and 2014, respectively. The provision for federal income taxes differs from the amount computed by applying the federal income tax statutory rate of 35 percent on income before income tax expense as indicated in the following analysis for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Federal tax based on statutory rate	$	72,428		$	49,373		$	28,441
Increase (decrease) resulting from:
Effect of tax-exempt income	(6,919		)	(7,064		)	(7,282		)
Interest and other nondeductible expenses	5,899			2,642			2,007
State taxes, net of federal benefit	3,955			2,531			3,237
Tax credits	(11,268		)	(12,012		)	(11,690		)
ASU 2014-01 Amortization on Low Income Housing Tax Credits	2,023			1,005			251
Other	(2,024		)	(792		)	1,169
	$	64,094		$	35,683		$	16,133
Effective tax rate	31.0		%	25.3		%	19.9		%

The composition of other items resulting in a net tax benefit of $2.0 million for the year ending December 31, 2015 arose principally from a decrease of $1.3 million related to effects of prior year amended returns and by $0.6 million for other discrete items, including prior year provision-to-return adjustments.

110

The net deferred tax asset at December 31 is as follows:

(Dollars in thousands)	2015			2014
Deferred tax asset:
NOL carryforward	$	17,258		$	978
Allowance for credit losses	56,446			59,267
Deferred compensation	7,528			6,631
Basis difference in acquired assets	48,256			53,202
Unrealized loss on securities available for sale	854			—
OREO	6,210			9,845
Other	10,438			13,530
	146,990			143,453
Deferred tax liability:
Basis difference in acquired assets	(31,975		)	(53,940		)
Gain on acquisition	(212		)	(2,426		)
FHLB stock	(122		)	(85		)
Premises and equipment	(1,658		)	(9,652		)
Acquisition intangibles	(7,648		)	(12,151		)
Deferred loan costs	(4,610		)	(3,771		)
Unrealized gain on securities available for sale	—			(4,052		)
Investments acquired	(167		)	(570		)
Swap gain	—			(75		)
Other	(16,694		)	(12,908		)
	(63,086		)	(99,630		)
Net deferred tax asset	$	83,904		$	43,823

Net operating loss carryforwards arising from acquisitions during 2015 expire over a 20-year period and will be utilized subject to annual Internal Revenue Code Section 382 limitations.  No benefit was recognized at acquisition for net operating losses that will expire unused due to the IRS limitations.

The Company determined that the net deferred tax asset is more likely than not to be realized based on an assessment of all available positive and negative evidence and therefore no valuation allowance has been recorded as of December 31, 2015 or 2014.

Retained earnings at December 31, 2015 and 2014 included approximately $21.9 million accumulated prior to January 1, 1987 for which no provision for federal income taxes has been made. If this portion of retained earnings is used in the future for any purpose other than to absorb bad debts, it will be added to future taxable income.

The Company does not believe it has any unrecognized tax benefits included in its consolidated financial statements. The Company has not had any settlements in the current period with taxing authorities, nor has it recognized tax benefits as a result of a lapse of the applicable statute of limitations.

During the years ended December 31, 2015, 2014, and 2013, the Company did not recognize any interest or penalties in its consolidated financial statements, nor has it recorded a liability for interest or penalty payments.

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NOTE 16 – SHAREHOLDERS' EQUITY, CAPITAL RATIOS AND OTHER REGULATORY MATTERS

During the third quarter of 2015, the Company issued an aggregate of 3,200,000 depositary shares (the “Depositary Shares”), each representing a 1/400th ownership interest in a share of the Company’s 6.625% Fixed-to-Floating Non-Cumulative Perpetual Preferred Stock, Series B, par value $1.00 per share, (“Series B Preferred Stock”), with a liquidation preference of $10,000 per share of Series B Preferred Stock (equivalent to $25 per depositary share) which represents $80,000,000 in aggregate liquidation preference.

Dividends will accrue and be payable on the Series B preferred stock, subject to declaration by the Company’s board of directors, from the date of issuance to, but excluding August 1, 2025, at a rate of 6.625% per annum, payable semi-annually, in arrears, and from and including August 1, 2025, dividends will accrue and be payable at a floating rate equal to three-month LIBOR plus a spread of 426.2 basis points, payable quarterly, in arrears. The Company may redeem the Series B preferred stock at its option, subject to regulatory approval, as described in the Prospectus. On January 4, 2016, the Company declared a semi-annual cash dividend of $0.805 per depositary share , which was paid on February 1, 2016.

The Company and IBERIABANK are subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy regulations and the regulatory framework for prompt corrective action, the Company and IBERIABANK, as applicable, must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

On January 1, 2015, the Company and IBERIABANK became subject to revised capital adequacy standards as implemented by new final rules approved by the U.S. banking regulatory agencies, including the FRB, to implement the revised standards of the BCBS and to address relevant provisions of the Dodd-Frank Act. Certain provisions of the new rules will be phased in from that date to January 1, 2019.

The final rules:

• Require that non-qualifying capital instruments, including trust preferred securities and cumulative perpetual preferred stock, must be fully phased out of Tier 1 capital by January 1, 2016,

• Establish new qualifying criteria for regulatory capital, including new limitations on the inclusion of deferred tax assets and mortgage servicing rights,

• Require a minimum ratio of common equity Tier 1 capital (“CET1”) to risk-weighted assets of 4.5%,

• Increase the minimum Tier 1 capital to risk-weighted assets ratio requirements from 4% to 6%,

• Implement a new capital conservation buffer requirement for a banking organization to maintain a buffer composed of CET1 capital in an amount greater than 2.5% above the minimum CET1 capital, Tier 1 capital and total risk-based capital ratios in order to avoid limitations on capital distributions, including dividend payments, and certain discretionary bonus payments to executive officers, with the buffer to be phased in beginning on January 1, 2016 at 0.625% and increasing annually until fully phased in at 2.5% by January 1, 2019. A banking organization with a buffer of less than the required amount would be subject to increasingly stringent limitations on certain distributions and payments as the buffer approaches zero, and

• Increase capital requirements for past-due loans, high volatility commercial real estate exposures, and certain short-term commitments and securitization exposures.

Management believes that, as of December 31, 2015, the Company and IBERIABANK met all capital adequacy requirements to which they are subject.

As of December 31, 2015, the most recent notification from the FRB categorized IBERIABANK as well-capitalized under the regulatory framework for prompt corrective action (the prompt corrective action requirements are not applicable to the Company). To be categorized as well-capitalized, an institution must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the following table. There are no conditions or events since the notification that management believes have changed that categorization. The Company’s and IBERIABANK’s actual capital amounts and ratios as of December 31 are presented in the following table.

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(Dollars in thousands)	2015
	Minimum				Well-Capitalized		Actual
	Amount		Ratio		Amount	Ratio	Amount		Ratio
Tier 1 Leverage
Consolidated	$	751,798	4.00	%	N/A	N/A	$	1,790,034	9.52	%
IBERIABANK	749,226		4.00		936,532	5.00	1,691,022		9.03
Common Equity Tier 1 (CET1) (1)
Consolidated	$	752,610	4.50	%	N/A	N/A	$	1,684,097	10.07	%
IBERIABANK	750,660		4.50		1,084,287	6.50	1,691,022		10.14
Tier 1 risk-based capital
Consolidated	$	1,003,479	6.00	%	N/A	N/A	$	1,790,034	10.70	%
IBERIABANK	1,000,880		6.00		1,334,507	8.00	1,691,022		10.14
Total risk-based capital
Consolidated	$	1,337,973	8.00	%	N/A	N/A	$	2,029,932	12.14	%
IBERIABANK	1,334,507		8.00		1,668,133	10.00	1,843,545		11.05

	2014
	Minimum				Well-Capitalized		Actual
	Amount		Ratio		Amount	Ratio	Amount		Ratio
Tier 1 Leverage
Consolidated	$	602,359	4.00	%	N/A	N/A	$	1,408,141	9.35	%
IBERIABANK	600,121		4.00		750,151	5.00	1,265,540		8.44
Tier 1 risk-based capital
Consolidated	$	504,086	4.00	%	N/A	N/A	$	1,408,141	11.17	%
IBERIABANK	502,421		4.00		753,631	6.00	1,265,540		10.08
Total risk-based capital
Consolidated	$	1,008,171	8.00	%	N/A	N/A	$	1,550,088	12.30	%
IBERIABANK	1,004,841		8.00		1,256,052	10.00	1,407,487		11.21

(1) Beginning January 1, 2016, minimum capital ratios will be subject to a capital conservation buffer of 0.625%. This capital conservation buffer will increase in subsequent years by 0.625% until it is fully phased in on January 1, 2019 at 2.50%.

Restrictions on Dividends, Loans and Advances

IBERIABANK is restricted under applicable laws in the payment of dividends to an amount equal to current year earnings plus undistributed earnings for the immediately preceding year, unless prior permission is received from the Commissioner of Financial Institutions for the State of Louisiana. Dividends payable by IBERIABANK in 2016 without permission will be limited to 2016 earnings plus an additional $148.7 million.

Funds available for loans or advances by IBERIABANK to the Parent amounted to $184.4 million. In addition, any dividends that may be paid by IBERIABANK to the Parent would be restricted if IBERIABANK did not comply with the above-described capital conservation buffer requirements and would be prohibited if the effect thereof would cause IBERIABANK’s capital to be reduced below applicable minimum capital requirements.

During any deferral period under the Company’s junior subordinated debt, the Company would be prohibited from declaring and paying dividends to preferred and common shareholders. In addition, so long as any shares of Series B Preferred Stock remain outstanding, we are prohibited from paying dividends on any of our common stock if the required payments on our Series B Preferred Stock have not been made. See Note 14 to the consolidated financial statements for additional information.

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NOTE 17 –EARNINGS PER SHARE

Share-based payment awards that entitle holders to receive non-forfeitable dividends before vesting are considered participating securities that are included in the calculation of earnings per share using the two-class method. The two-class method is an earnings allocation formula under which earnings per share is calculated for common stock and participating securities according to dividends declared and participating rights in undistributed earnings. Under this method, all earnings, distributed and undistributed, are allocated to common shares and participating securities based on their respective rights to receive dividends.

The following table presents the calculation of basic and diluted earnings per share for the periods indicated.

	For the Years Ended December 31,
(In thousands, except per share data)	2015			2014			2013
Earnings per common share - basic
Net income	$	142,844		$	105,382		$	65,128
Dividends and undistributed earnings allocated to unvested restricted shares	(1,680		)	(1,651		)	(1,205		)
Net income allocated to common shareholders - basic	$	141,164		$	103,731		$	63,923
Weighted average common shares outstanding	38,214			31,307			29,052
Earnings per common share - basic	3.69			3.31			2.20
Earnings per common share - diluted
Net income allocated to common shareholders - basic	$	141,164		$	103,731		$	63,923
Dividends and undistributed earnings allocated to unvested restricted shares	(48		)	(34		)	(4		)
Net income allocated to common shareholders - diluted	$	141,116		$	103,697		$	63,919
Weighted average common shares outstanding	38,214			31,307			29,052
Dilutive potential common shares	96			126			53
Weighted average common shares outstanding - diluted	38,310			31,433			29,105
Earnings per common share outstanding - diluted	$	3.68		$	3.30		$	2.20

For the years ended December 31, 2015, 2014, and 2013, the calculations for basic shares outstanding exclude the weighted average shares owned by the Recognition and Retention Plan (“RRP”) of 607,608; 625,555; and 642,008, respectively.

The effects from the assumed exercises of 159,236; 13,101; and 483,696 stock options were not included in the computation of diluted earnings per share for the years ended December 31, 2015, 2014, and 2013, respectively, because such amounts would have had an antidilutive effect on earnings per common share.

NOTE 18 – SHARE-BASED COMPENSATION

The Company has various types of share-based compensation plans that permit the granting of awards in the form of stock options, restricted stock, restricted share units, phantom stock and performance units. These plans are administered by the Compensation Committee of the Board of Directors, which selects persons eligible to receive awards and determines the terms, conditions and other provisions of the awards. At December 31, 2015, awards of 784,254 shares could be made under approved incentive compensation plans. The Company issues shares to fulfill stock option exercises and restricted share units and restricted stock awards vesting from available authorized common shares. At December 31, 2015, the Company believes there are adequate authorized shares to satisfy anticipated stock option exercises and restricted share unit and restricted stock award vesting.

Stock option awards

The Company issues stock options under various plans to directors, officers and other key employees. The option exercise price cannot be less than the fair value of the underlying common stock as of the date of the option grant and the maximum option term cannot exceed ten years.

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The following table represents the activity related to stock options during the periods indicated:

	Number of Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value (Dollars in thousands)		Weighted Average Remaining Contract Life (in years)
Outstanding options, December 31, 2012	1,236,075		$	51.48
Granted	75,722		52.36
Exercised	(200,748	)	40.35		$	2,740
Forfeited or expired	(38,220	)	55.87
Outstanding options, December 31, 2013	1,072,829		$	53.47
Granted	77,434		65.31
Exercised	(267,421	)	48.57		4,612
Forfeited or expired	(15,160	)	60.38
Outstanding options, December 31, 2014	867,682		$	55.92
Granted	82,001		62.50
Exercised	(119,917	)	51.71		1,516
Forfeited or expired	(15,989	)	66.52
Outstanding options, December 31, 2015	813,777		$	56.99	$	1,061	5.1
Exercisable options, December 31, 2013	707,934		53.54
Exercisable options, December 31, 2014	562,752		55.92
Exercisable options, December 31, 2015	546,842		$	56.54	$	665	3.9

The following table represents weighted average remaining life as of December 31, 2015 for options outstanding within the stated exercise prices:

	Options Outstanding				Options Exercisable
Exercise Price Range Per Share	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Life	Number of Options	Weighted Average Exercise Price
$36.48 to $51.69	108,856	$	50.05	5.4 years	70,437	$	49.69
$51.70 to $52.88	170,627	52.34		6.5 years	86,365	52.34
$52.89 to $56.26	133,884	54.94		4.3 years	124,397	54.89
$56.27 to $59.04	121,591	57.53		1.2 years	119,855	57.52
$59.05 to $62.39	119,583	59.92		3.4 years	116,867	59.87
$62.40 to $111.71	159,236	65.83		8.2 years	28,921	75.41
Total options	813,777	$	56.99	5.1 years	546,842	$	56.54

The Company uses the Black-Scholes option pricing model to estimate the fair value of stock option awards. The following weighted-average assumptions were used for option awards issued during the years ended December 31:

	2015			2014			2013
Expected dividends	2.2		%	2.1		%	2.6		%
Expected volatility	35.6		%	35.8		%	34.8		%
Risk-free interest rate	2.0		%	2.3		%	1.7		%
Expected term (in years)	7.5			7.5			8.6
Weighted-average grant-date fair value	$	19.57		$	21.26		$	15.37

The assumptions above are based on multiple factors, including historical stock option exercise patterns and post-vesting employment termination behaviors, expected future exercise patterns and the expected volatility of the Company’s stock price.

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The following table represents the compensation expense that is included in non-interest expense and related income tax benefits in the accompanying consolidated statements of comprehensive income related to stock options for the years ended December 31:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to stock options	$	1,861	$	2,053	$	2,110
Income tax benefit related to stock options	317		375		379

At December 31, 2015, there was $2.7 million of unrecognized compensation cost related to stock options that is expected to be recognized over a weighted-average period of 5.1 years.

Restricted stock awards

The Company issues restricted stock under various plans for certain officers and directors. The restricted stock awards may not be sold or otherwise transferred until certain restrictions have lapsed. The holders of the restricted stock receive dividends and have the right to vote the shares. The compensation expense for these awards is determined based on the market price of the Company's common stock at the date of grant applied to the total number of shares granted and is recognized over the vesting period (generally three to seven years). As of December 31, 2015 and 2014, unrecognized share-based compensation associated with these awards totaled $19.5 million and $19.8 million, respectively. The unrecognized compensation cost related to restricted stock awards at December 31, 2015 is expected to be recognized over a weighted-average period of 2.7 years.

Restricted share units

In 2015 and 2014, the Company issued restricted share units to certain of its executive officers. Restricted share units vest after the end of a three years performance period, based on satisfaction of the market and performance conditions set forth in the restricted share unit agreement. Recipients do not possess voting or investment power over the common stock underlying such units until vesting. The grant date fair value of these restricted share units is the same as the value of the corresponding number of shares of common stock, adjusted for assumptions surrounding the market-based conditions contained in the respective agreements. See Note 1 for further discussion of restricted share units with market or performance conditions.

The following table represents the compensation expense that was included in non-interest expense and related income tax benefits in the accompanying consolidated statements of comprehensive income related to restricted stock awards and restricted share units for the years ended December 31:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to restricted stock awards and restricted share units	$	12,045	$	9,932	$	8,593
Income tax benefit related to restricted stock awards and restricted share units	4,215		3,476		3,008

The following table represents unvested restricted stock award and restricted share unit activity for the years ended December 31:

	2015		2014		2013
Balance at beginning of period	506,289		523,756		538,202
Granted	207,575		168,254		167,095
Forfeited	(26,970	)	(18,171	)	(28,713	)
Earned and issued	(179,764	)	(167,550	)	(152,828	)
Balance at end of period	507,130		506,289		523,756

The weighted average grant date fair value of restricted stock awards and restricted share units granted was $63.16, $65.11, and $51.98 for the years ended December 31, 2015, 2014, and 2013, respectively. The total fair value of restricted stock awards and restricted share units vested during the years ended December 31, 2015, 2014, and 2013 was $11.3 million, $10.9 million, and $7.8 million, respectively.

Phantom stock awards

The Company issues phantom stock awards to certain key officers and employees. The award is subject to a vesting period of five to seven years and is paid out in cash upon vesting. The amount paid per vesting period is calculated as the number of

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vested “share equivalents” multiplied by the closing market price of a share of the Company’s common stock on the vesting date. Share equivalents are calculated on the date of grant as the total award’s dollar value divided by the closing market price of a share of the Company’s common stock on the grant date. Award recipients are also entitled to a “dividend equivalent” on each unvested share equivalent held by the award recipient. A dividend equivalent is a dollar amount equal to the cash dividends that the participant would have been entitled to receive if the participant’s share equivalents were issued in shares of common stock. Dividend equivalents are reinvested as share equivalents that will vest and be paid out on the same date as the underlying share equivalents on which the dividend equivalents were paid. The number of share equivalents acquired with a dividend equivalent is determined by dividing the aggregate of dividend equivalents paid on the unvested share equivalents by the closing price of a share of the Company’s common stock on the dividend payment date.

Performance units

In 2015 and 2014, the Company issued performance units to certain of its executive officers. Performance units are tied to the value of shares of the Company's common stock, are payable in cash, and vest in increments of one-third per year after attainment of one or more performance measures. The value of performance units is the same as the value of the corresponding number of shares of common stock.

The following table indicates compensation expense recorded for phantom stock and performance units based on the number of share equivalents vested at December 31 of the years indicated and the current market price of the Company’s stock at that time:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to phantom stock and performance units	$	12,109	$	5,496	$	4,855

The following table represents phantom stock award and performance unit activity during the periods indicated.

(Dollars in thousands)	Number of share equivalents (1)		Value of share equivalents (2)
Balance, December 31, 2012	328,273		$	16,125
Granted	179,041		11,253
Forfeited share equivalents	(18,744	)	1,178
Vested share equivalents	(54,686	)	2,937
Balance, December 31, 2013	433,884		$	27,270
Granted	146,166		9,479
Forfeited share equivalents	(22,800	)	1,479
Vested share equivalents	(81,903	)	5,512
Balance, December 31, 2014	475,347		$	30,826
Granted	167,573		9,228
Forfeited share equivalents	(34,681	)	1,910
Vested share equivalents	(145,809	)	9,288
Balance, December 31, 2015	462,430		$	25,466

(1) Number of share equivalents includes all reinvested dividend equivalents for the years indicated.

(2) Except for share equivalents at the beginning of each period, which are based on the value at that time, and vested share payments, which are based on the cash paid at the time of vesting, the value of share equivalents is calculated based on the market price of the Company’s stock at the end of the respective periods. The market price of the Company’s stock was $55.07, $64.85 and $62.85 on December 31, 2015, 2014 and 2013, respectively.

401(k) defined contribution plan

The Company has a 401(k) Profit Sharing Plan covering substantially all of its employees. Annual employer contributions to the Plan are set by the Board of Directors. The Company made contributions of $1.7 million, $1.5 million, and 1.3 million for the years ended December 31, 2015, 2014, and 2013, respectively. The Plan provides, among other things, that participants in the Plan be able to direct the investment of their account balances within the Profit Sharing Plan into alternative investment funds. Participant deferrals under the salary reduction election may be matched by the employer based on a percentage to be determined annually by the employer.

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NOTE 19 – COMMITMENTS AND CONTINGENCIES

Off-balance sheet commitments

In the normal course of business, to meet the financing needs of its customers, the Company is a party to credit related financial instruments, with risk not reflected in the consolidated financial statements. These financial instruments include commitments to extend credit, standby letters of credit, and commercial letters of credit. Such commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets. The credit policies used for these commitments are consistent with those used for on-balance sheet instruments. The Company’s exposure to credit loss in the event of non-performance by its customers under such commitments or letters of credit represents the contractual amount of the financial instruments as indicated in the table below. At December 31, 2015 and 2014, the fair value of guarantees under commercial and standby letters of credit was $1.5 million and $1.3 million, respectively. This fair value amount represents the unamortized fees associated with these guarantees and is included in “other liabilities” on the Company's consolidated balance sheets. This fair value will decrease as the existing commercial and standby letters of credit approach their expiration dates.

At December 31, the Company had the following financial instruments outstanding and related reserves, whose contract amounts represent credit risk:

(Dollars in thousands)	2015		2014
Commitments to grant loans	$	61,240	$	161,350
Unfunded commitments under lines of credit	4,617,802		4,007,954
Commercial and standby letters of credit	150,281		134,882
Reserve for unfunded lending commitments	14,145		11,801

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to be drawn upon, the total commitment amounts generally represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral, if any, is based on management’s credit evaluation of the customer.

Unfunded commitments under commercial lines of credit, revolving credit lines, and overdraft protection agreements are commitments for possible future extensions of credit to existing customers. Many of these types of commitments do not contain a specified maturity date and may not be drawn upon to the total extent to which the Company is committed. See Note 6 for additional discussion related to the Company’s unfunded lending commitments.

Commercial and standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements, including commercial paper issuance, bond financing, and similar transactions. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. When necessary they are collateralized, generally in the form of marketable securities and cash equivalents.

Legal proceedings

The nature of the business of the Company’s banking and other subsidiaries ordinarily results in a certain amount of claims, litigation, investigations, and legal and administrative cases and proceedings, all of which are considered incidental to the normal conduct of business. Some of these claims are against entities or assets of which the Company is a successor or acquired in business acquisitions and certain of these claims will be covered by loss sharing agreements with the FDIC. The Company has asserted defenses to these litigations and, with respect to such legal proceedings, intends to continue to defend itself vigorously, litigating or settling cases according to management’s judgment as to what is in the best interest of the Company and its shareholders.

The Company assesses its liabilities and contingencies in connection with outstanding legal proceedings utilizing the latest information available. Where it is probable that the Company will incur a loss and the amount of the loss can be reasonably estimated, the Company records a liability in its consolidated financial statements. These legal reserves may be increased or decreased to reflect any relevant developments on a quarterly basis. Where a loss is not probable or the amount of loss is not estimable, the Company does not accrue legal reserves. While the outcome of legal proceedings is inherently uncertain, based on information currently available, advice of counsel, and available insurance coverage, the Company’s management believes that it has established appropriate legal reserves. Any liabilities arising from pending legal proceedings are not expected to have a material adverse effect on the Company’s consolidated financial position, consolidated results of operations, or consolidated

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cash flows. However, in the event of unexpected future developments, it is possible that the ultimate resolution of these matters, if unfavorable, may be material to the Company’s consolidated financial position, consolidated results of operations, or consolidated cash flows.

As of the date of this filing, the Company believes the amount of losses associated with legal proceedings that it is reasonably possible to incur above amounts already accrued is immaterial.

NOTE 20 – FAIR VALUE MEASUREMENTS

Recurring fair value measurements

The Company has segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to estimate the fair value at the measurement date in the tables below. See Note 1, Summary of Significant Accounting Policies, for a description of how fair value measurements are determined.

	December 31, 2015
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Securities available for sale	$	—	$	2,800,286	$	—	$	2,800,286
Mortgage loans held for sale	—		166,247		—		166,247
Derivative instruments	—		30,486		—		30,486
Total	$	—	$	2,997,019	$	—	$	2,997,019
Liabilities
Derivative instruments	$	—	$	24,939	$	—	$	24,939
Total	$	—	$	24,939	$	—	$	24,939
	December 31, 2014
	Level 1		Level 2		Level3		Total
Assets
Securities available for sale	$	—	$	2,158,853	$	—	$	2,158,853
Mortgage loans held for sale	—		139,950		—		139,950
Derivative instruments	—		32,903		—		32,903
Total	$	—	$	2,331,706	$	—	$	2,331,706
Liabilities
Derivative instruments	$	—	$	31,354	$	—	$	31,354
Total	$	—	$	31,354	$	—	$	31,354

During 2015, there were no transfers between the Level 1 and Level 2 fair value categories. During 2014, available for sale securities with a market value of $14.4 million were transferred from the Level 1 to Level 2 fair value category in the table above. The security was issued by Freddie Mac and was included in the Level 1 category at December 31, 2013 based on a recent trade price in the open market.

Gains and losses (realized and unrealized) included in earnings (or accumulated other comprehensive income) during 2015 related to assets and liabilities measured at fair value on a recurring basis are reported in non-interest income or other comprehensive income as follows:

(Dollars in thousands)	Non-interest income		Other comprehensive income
Total gains (losses) included in earnings	$	2,939	$	—
Change in unrealized gains (losses) relating to assets still held at December 31, 2015	—		(9,110		)

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Non-recurring fair value measurements

The Company has segregated all financial assets and liabilities that are measured at fair value on a non-recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below.

	December 31, 2015
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
OREO, net	$	—	$	1,106	$	—	$	1,106
Total	$	—	$	1,106	$	—	$	1,106
	December 31, 2014
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
OREO, net	$	—	$	1,483	$	—	$	1,483
Total	$	—	$	1,483	$	—	$	1,483

The tables above exclude the initial measurement of assets and liabilities that were acquired as part of the acquisitions completed in 2014 and 2015. These assets and liabilities were recorded at their fair value upon acquisition in accordance with U.S. GAAP and were not re-measured during the periods presented unless specifically required by U.S. GAAP. Acquisition date fair values represent either Level 2 fair value measurements (investment securities, OREO, property, equipment, and debt) or Level 3 fair value measurements (loans, deposits, and core deposit intangible asset).

The Company did not record any liabilities at fair value for which measurement of the fair value was made on a non-recurring basis during the years ended December 31, 2015, 2014 and 2013.

Fair value option

The Company has elected the fair value option for certain originated residential mortgage loans held for sale, which allows for a more effective offset of the changes in fair values of the loans and the derivative instruments used to hedge them without the burden of complying with the requirements for hedge accounting.

The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for mortgage loans held for sale measured at fair value:

	December 31, 2015						December 31, 2014
(Dollars in thousands)	Aggregate Fair Value		Aggregate Unpaid Principal		Aggregate Fair Value Less Unpaid Principal		Aggregate Fair Value		Aggregate Unpaid Principal		Aggregate Fair Value Less Unpaid Principal
Mortgage loans held for sale, at fair value	$	166,247	$	161,083	$	5,164	$	139,950	$	134,639	$	5,311

Interest income on mortgage loans held for sale is recognized based on contractual rates and is reflected in interest income on loans held for sale in the consolidated statements of comprehensive income. Changes in fair value of these loans that were recorded in mortgage income in the consolidated statements of comprehensive income resulted in net losses of $1.0 million and $3.5 million for the years ended December 31, 2015 and 2014, respectively. Net gains resulting from the change in fair value of these loans were $0.4 million for the year ended December 31, 2013. The changes in fair value are mostly offset by economic hedging activities, with an immaterial portion of these changes attributable to changes in instrument-specific credit risk.

120

NOTE 21 – FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair value of a financial instrument is the current amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. ASC Topic 825, Financial Instruments, excludes certain financial instruments and all non-financial instruments from its disclosure requirements. Consequently, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company.

The carrying amount and estimated fair values, as well as the level within the fair value hierarchy, of the Company’s financial instruments are included in the tables below. See Note 1, Summary of Significant Accounting Policies, for a description of how fair value measurements are determined.

	December 31, 2015
(Dollars in thousands)	Carrying  Amount		Fair Value		Level 1		Level 2		Level 3
Financial Assets
Cash and cash equivalents	$	510,267	$	510,267	$	510,267	$	—	$	—
Investment securities	2,899,214		2,901,247		—		2,901,247		—
Loans and loans held for sale, net of unearned income and allowance for loan losses	14,355,297		14,674,749		—		166,247		14,508,502
FDIC loss share receivables	39,878		9,163		—		—		9,163
Derivative instruments	30,486		30,486		—		30,486		—
Financial Liabilities
Deposits	$	16,178,748	$	15,696,245	$	—	$	—	$	15,696,245
Short-term borrowings	326,617		326,617		326,617		—		—
Long-term debt	340,447		309,847		—		—		309,847
Derivative instruments	24,939		24,939		—		24,939		—
	December 31, 2014
(Dollars in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial Assets
Cash and cash equivalents	$	548,095	$	548,095	$	548,095	$	—	$	—
Investment securities	2,275,813		2,278,334		—		2,278,334		—
Loans and loans held for sale, net of unearned income and allowance for loan losses	11,450,985		11,475,315		—		139,950		11,335,365
FDIC loss share receivables	69,627		19,606		—		—		19,606
Derivative instruments	32,903		32,903		—		32,903		—
Financial Liabilities
Deposits	$	12,520,525	$	12,298,017	$	—	$	—	$	12,298,017
Short-term borrowings	845,742		845,742		845,742		—		—
Long-term debt	403,254		376,139		—		—		376,139
Derivative instruments	31,354		31,354		—		31,354		—

The fair value estimates presented herein are based upon pertinent information available to management as of December 31, 2015 and 2014. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and, therefore, current estimates of fair value may differ significantly from the amounts presented herein.

121

NOTE 22 – RELATED PARTY TRANSACTIONS

In the ordinary course of business, the Company may execute transactions with various related parties. These transactions are consummated at terms equivalent to the prevailing market rates and terms at the time. Examples of such transactions may include lending or deposit arrangements, transfers of financial assets, services for administrative support, and other miscellaneous items.

The Company has granted loans to executive officers and directors and their affiliates. These loans, including the related principal additions, principal payments, and unfunded commitments are immaterial to the consolidated financial statements at December 31, 2015 and 2014. None of the related party loans were classified as non-accrual, past due, troubled debt restructurings, or potential problem loans at December 31, 2015 and 2014.

Deposits from related parties held by the Company were also immaterial at December 31, 2015 and 2014.

NOTE 23 – BUSINESS SEGMENTS

Each of the Company’s reportable operating segments serves the specific needs of the Company’s customers based on the products and services it offers. The reportable segments are based upon those revenue-producing components for which separate financial information is produced internally and primarily reflect the manner in which resources are allocated and performance is assessed. Further, the reportable operating segments are also determined based on the quantitative thresholds prescribed within ASC Topic 280, Segment Reporting, and consideration of the usefulness of the information to the users of the consolidated financial statements.

The Company reports the results of its operations through three reportable segments: IBERIABANK, IMC, and LTC. The IBERIABANK segment represents the Company’s commercial and retail banking functions, including its lending, investment, and deposit activities. IBERIABANK also includes the Company’s wealth management, capital markets, and other corporate functions. The IMC segment represents the Company’s origination, funding, and subsequent sale of one-to-four family residential mortgage loans. The LTC segment represents the Company’s title insurance and loan closing services.

Certain expenses not directly attributable to a specific reportable segment are allocated to segments based on pre-determined methods that reflect utilization. Also within IBERIABANK are certain reconciling items that translate reportable segment results into consolidated results. The following tables present certain information regarding our operations by reportable segment, including a reconciliation of segment results to reported consolidated results for the periods presented. Reconciling items between segment results and reported results include:

• Elimination of interest income and interest expense representing interest earned by IBERIABANK on interest-bearing checking accounts held by related companies, as well as the elimination of the related deposit balances at the IBERIABANK segment;

• Elimination of investment in subsidiary balances on certain operating segments included in total and average segment assets; and

• Elimination of intercompany due to and due from balances on certain operating segments that are included in total and average segment assets.

122

	Year Ended December 31, 2015
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	639,793		$	7,062		$	3		$	646,858
Interest expense	56,222			2,878			—			59,100
Net interest income	583,571			4,184			3			587,758
Provision for loan losses	30,908			—			—			30,908
Mortgage income	1,426			79,696			—			81,122
Title revenue	—			—			22,837			22,837
Other non-interest income	116,443			(2		)	(7		)	116,434
Allocated expenses	(16,253		)	12,036			4,217			—
Non-interest expense	495,158			57,784			17,363			570,305
Income before income tax expense	191,627			14,058			1,253			206,938
Income tax expense	58,006			5,581			507			64,094
Net income	$	133,621		$	8,477		$	746		$	142,844
Total loans and loans held for sale, net of unearned income	$	14,305,663		$	188,012		$	—		$	14,493,675
Total assets	19,220,085			256,888			27,095			19,504,068
Total deposits	16,173,831			4,917			—			16,178,748
Average assets	18,146,216			230,819			25,671			18,402,706

	Year Ended December 31, 2014
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	498,820		$	5,992		$	3		$	504,815
Interest expense	42,983			1,721			—			44,704
Net interest income	455,837			4,271			3			460,111
Provision for loan losses	18,966			94			—			19,060
Mortgage income	71			51,726			—			51,797
Title revenue	—			—			20,492			20,492
Other non-interest income	101,401			(61		)	(1		)	101,339
Allocated expenses	(11,602		)	8,203			3,399			—
Non-interest expense	412,165			44,761			16,688			473,614
Income before income tax expense	137,780			2,878			407			141,065
Income tax expense	34,352			1,148			183			35,683
Net income	$	103,428		$	1,730		$	224		$	105,382
Total loans and loans held for sale, net of unearned income	$	11,415,973		$	165,143		$	—		$	11,581,116
Total assets	15,537,731			194,156			26,017			15,757,904
Total deposits	12,515,329			5,196			—			12,520,525
Average assets	14,430,768			176,003			25,223			14,631,994

123

	Year Ended December 31, 2013
(Dollars in thousands)	IBERIABANK			IMC			LTC		Consolidated
Interest and dividend income	$	431,418		$	5,747		$	32	$	437,197
Interest expense	45,150			1,803			—		46,953
Net interest income	386,268			3,944			32		390,244
Provision for loan losses	5,123			22			—		5,145
Mortgage income	2			64,195			—		64,197
Title revenue	—			—			20,526		20,526
Other non-interest income	84,243			(10		)	2		84,235
Allocated expenses	(7,453		)	5,417			2,036		—
Non-interest expense	406,380			49,723			16,693		472,796
Income before income tax expense	66,463			12,967			1,831		81,261
Income tax expense	10,299			5,093			741		16,133
Net income	$	56,164		$	7,874		$	1,090	$	65,128
Total loans and loans held for sale, net of unearned income	$	9,472,908		$	147,553		$	—	$	9,620,461
Total assets	13,167,162			173,131			25,257		13,365,550
Total deposits	10,734,030			2,970			—		10,737,000
Average assets	12,794,997			183,513			25,478		13,003,988

NOTE 24 – CONDENSED PARENT COMPANY ONLY FINANCIAL STATEMENTS

Condensed financial statements of the Parent are shown below. The Parent has no significant operating activities.

Condensed Balance Sheets

(Dollars in thousands)	December 31
	2015		2014
Assets
Cash in bank	$	154,298	$	36,064
Investments in subsidiaries	2,449,325		1,841,420
Other assets	54,454		119,493
	$	2,658,077	$	1,996,977
Liabilities and Shareholders’ Equity
Liabilities	$	159,242	$	144,829
Shareholders’ equity	2,498,835		1,852,148
	$	2,658,077	$	1,996,977

124

Condensed Statements of Income

	Year Ended December 31
(Dollars in thousands)	2015			2014			2013
Operating income
Dividends from bank subsidiary	$	—		$	—		$	49,000
Dividends from non-bank subsidiaries	—			—			1,511
Reimbursement of management expenses	59,255			46,433			34,474
Other income	(329		)	437			869
Total operating income	58,926			46,870			85,854
Operating expenses
Interest expense	3,393			3,224			3,232
Salaries and employee benefits expense	41,689			31,981			29,159
Other expenses	17,492			14,576			13,651
Total operating expenses	62,574			49,781			46,042
Income (loss) before income tax benefit and increase in equity in undistributed earnings of subsidiaries	(3,648		)	(2,911		)	39,812
Income tax expense (benefit)	800			(518		)	(2,808		)
Income (loss) before equity in undistributed earnings of subsidiaries	(4,448		)	(2,393		)	42,620
Equity in undistributed earnings of subsidiaries	147,292			107,775			22,508
Net income	$	142,844		$	105,382		$	65,128

125

Condensed Statements of Cash Flows

(Dollars in thousands)	Year Ended December 31
	2015			2014			2013
Cash Flow from Operating Activities
Net income	$	142,844		$	105,382		$	65,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	416			595			2,035
Net income of subsidiaries	(147,292		)	(107,775		)	(73,044		)
Share-based compensation cost	13,906			11,985			10,703
Gain on sale of assets	(110		)	—			—
Tax benefit associated with share-based payment arrangements	(580		)	(2,105		)	(886		)
Other, net	82,105			(27,274		)	7,575
Net Cash Provided by (Used in) Operating Activities	91,289			(19,192		)	11,511
Cash Flow from Investing Activities
Cash paid in excess of cash received for acquisitions	(5,054		)	4,783			—
Proceeds from sale of premises and equipment	12			—			11,751
Purchases of premises and equipment	(2		)	(36		)	(5,247		)
Return of capital from (Capital contributed to) subsidiary	5,000			(14,600		)	—
Dividends received from subsidiaries	—			—			50,511
Net Cash (Used in) Provided by Investing Activities	(44		)	(9,853		)	57,015
Cash Flow from Financing Activities
Cash dividends paid on common stock	(52,318		)	(43,070		)	(40,332		)
Proceeds from common stock transactions	5,535			11,693			8,101
Payments to repurchase common stock	(3,620		)	(3,727		)	(2,280		)
Net proceeds from issuance of preferred stock	76,812			—			—
Tax benefit associated with share-based payment arrangements	580			2,105			886
Net Cash Provided by (Used In) Financing Activities	26,989			(32,999		)	(33,625		)
Net Increase (Decrease) in Cash and Cash Equivalents	118,234			(62,044		)	34,901
Cash and Cash Equivalents at Beginning of Period	36,064			98,108			63,207
Cash and Cash Equivalents at End of Period	$	154,298		$	36,064		$	98,108

Corporate Information

Corporate Headquarters

IBERIABANK Corporation

200 West Congress Street

Lafayette, LA 70501

337.521.4012

Corporate Mailing Address

P.O. Box 52747

Lafayette, LA 70505-2747

Annual Meeting

IBERIABANK Corporation Annual Meeting of Shareholders will be held on Wednesday, May 4, 2016 at 4:00 p.m., local time, at the Windsor Court Hotel, located at 300 Gravier Street, New Orleans, Louisiana.

Shareholder Assistance

Shareholders requesting a change of address, records or information about the Dividend Reinvestment Plan, or lost certificates should contact:

126

Investor Relations

Computershare

PO Box 30170

College Station, TX 77842-3170

800.368.5948

www.computershare.com/investor

For Information

Copies of the Company’s Annual Report on Form 10-K including financial statements and financial statement schedules, will be furnished to Shareholders without cost by sending a written request to Robert B. Worley, Jr., Secretary, IBERIABANK Corporation, 601 Poydras Street, 21st Floor, New Orleans, Louisiana 70130. This and other information regarding IBERIABANK Corporation and its subsidiaries may be accessed from our web sites. In addition, shareholders may contact:

Daryl G. Byrd, President and CEO

337.521.4003

John R. Davis, Senior Executive Vice President

337.521.4005

Internet Addresses

www.iberiabank.com

www.iberiabankmortgage.com

www.lenderstitle.com

www.utla.com

www.iberiabankcreditcards.com

Stock Information

	MARKET PRICE						DIVIDENDS DECLARED
2015	HIGH		LOW		CLOSING
First Quarter	$	65.45	$	54.34	$	63.03	$	0.34
Second Quarter	$	71.21	$	61.13	$	68.23	$	0.34
Third Quarter	$	69.99	$	56.63	$	58.21	$	0.34
Fourth Quarter	$	65.38	$	52.27	$	55.07	$	0.34
	MARKET PRICE						DIVIDENDS DECLARED
2014	HIGH		LOW		CLOSING
First Quarter	$	72.41	$	60.96	$	70.15	$	0.34
Second Quarter	$	71.94	$	59.20	$	69.19	$	0.34
Third Quarter	$	70.58	$	62.40	$	62.51	$	0.34
Fourth Quarter	$	70.00	$	60.53	$	64.85	$	0.34

At February 19, 2016, IBERIABANK Corporation had approximately 2,927 shareholders of record.

Securities Listing

IBERIABANK Corporation’s common stock trades on the NASDAQ Global Select Market under the symbol “IBKC.” In local and national newspapers, the Company is listed under “IBERIABANK.”

127

Dividend Restrictions

The majority of the Company’s revenue is from dividends declared and paid to the Company by its subsidiary, IBERIABANK, which is subject to laws and regulations that limit the amount of dividends and other distributions it can pay. In addition, the Company and IBERIABANK are required to maintain capital at or above regulatory minimums and to remain “well-capitalized” under prompt corrective action regulations. The declaration and payment of dividends on the Company’s capital stock also is subject to contractual restrictions. While the Company has Series B preferred stock outstanding, the Company may not declare and pay a dividend on its common stock unless dividends on all such outstanding preferred stock have been declared and paid in full or declared and a sum sufficient for the payment of those dividends has been set aside. See Note 14- Long-Term Debt and Note 16- Shareholders Equity, Capital Requirements and Other Regulatory Matters and Management’s Discussion and Analysis of Financial Condition and Results of Operations - Funding Sources - Long-term Debt.

Dividend Investment Plan

IBERIABANK Corporation shareholders may take advantage of our Dividend Reinvestment Plan. This program provides a convenient, economical way for shareholders to increase their holdings of the Company’s common stock. The shareholder pays no brokerage commissions or service charges while participating in the plan. A nominal fee is charged at the time that an individual terminates plan participation. This plan does not currently offer participants the ability to purchase additional shares with optional cash payments.

To enroll in the IBERIABANK Corporation Dividend Reinvestment Plan, shareholders must complete an enrollment form. A summary of the plan and enrollment forms are available from the Register and Transfer Company at the address provided under Shareholder Assistance.

128

EX-21

EXHIBIT 21

SUBSIDIARIES OF THE REGISTRANT

IBERIABANK Corporation, a Louisiana corporation, is a bank holding company that has elected to become a financial holding company. The table below sets forth all of IBERIABANK Corporation’s subsidiaries as to state or jurisdiction of organization. All of the subsidiaries listed below are included in the consolidated financial statements, and no separate financial statements are submitted for any subsidiary.

Subsidiary	State or Jurisdiction of Organization
IBERIABANK	Louisiana
Acadiana Holdings, L.L.C.	Louisiana
CB Florida CRE Holdings, LLC	Florida
CB Florida RRE Holdings, LLC	Florida
CSB Alabama CRE Holdings, LLC	Alabama
CSB Alabama Sunhill Villas Holding, LLC	Alabama
CSB Alabama RRE Holdings, LLC	Alabama
CSB Florida CRE Holdings, LLC	Florida
CSB Florida Overlook Holdings, LLC	Florida
CSB Florida RRE Holdings, LLC	Florida
Finesco, LLC	Louisiana
IB SPE Management, Inc.	Louisiana
IBERIABANK Insurance Services, LLC	Louisiana
IBERIABANK Mortgage Company	Arkansas
Iberia Financial Services, L.L.C.	Louisiana
Iberia Investment Fund I, LLC	Louisiana
Iberia Investment Fund II, LLC	Louisiana
Jefferson Insurance Corporation	Louisiana
Laguna Vista, LLC	Florida
Lee Cape, LLC	Florida
Liberty Bancorp Denning LLC	Florida
840 Denning LLC	Florida
Mercantile Capital Corporation Inc.	Florida
North River Holdings, Inc.	Florida
OB Boatman 1 LLC	Florida
OB Boatman 2 LLC	Florida
OB Capri LLC	Florida
OB Copperhead LLC	Florida
OB Creekside LLC	Florida
OB Florida CRE Holdings, LLC	Florida
OB Florida RRE Holdings, LLC	Florida
OB FHB LLC	Florida
OB Fralin LLC	Florida
OB Keys LLC	Florida
OB Manatee Forest LLC	Florida
OB Marathon LLC	Florida
OB Marco Isle LLC	Florida
OB Meadows Terrace LLC	Florida

OB Naples LLC	Florida
OB NP LLC	Florida
OB RFB LLC	Florida
OB Waterford LLC	Florida
SB Florida CRE Holdings, LLC	Florida
SB Florida RRE Holdings, LLC	Florida
Security Mutual Financial Services, Inc.	Alabama
Lenders Title Company	Arkansas
Asset Exchange, Inc.	Arkansas
United Title of Louisiana, Inc.	Louisiana
United Title of Alabama, Inc.	Alabama
American Abstract and Title Company, Inc.	Arkansas
1887 Leasing, LLC	Louisiana
IB Aircraft Holdings, LLC	Louisiana
IBERIA Capital Partners L.L.C.	Louisiana
IBERIA CDE, L.L.C.	Louisiana
IBERIA Asset Management, Inc.	Louisiana

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

Registration Statement (Form S-8 No. 333-28859) pertaining to the IBERIABANK Corporation 1996 Stock Option Plan;

Registration Statement (Form S-8 No. 333-79811) pertaining to the IBERIABANK Corporation Retirement Savings Plan;

Registration Statement (Form S-8 No. 333-81315) pertaining to the IBERIABANK Corporation 1999 Stock Option Plan;

Registration Statement (Form S-8 No. 333-41970) pertaining to the IBERIABANK Corporation Supplemental Stock Option Plan;

Registration Statement (Form S-8 No. 333-64402) pertaining to the IBERIABANK Corporation 2001 Incentive Compensation Plan;

Registration Statement (Form S-8 No. 333-117356) pertaining to the IBERIABANK Corporation Stock Purchase Warrants;

Registration Statement (Form S-8 No. 333-130273) pertaining to the IBERIABANK Corporation 2005 Stock Incentive Plan;

Registration Statement (Form S-8 No. 333-135359) pertaining to the IBERIABANK Corporation Retirement Savings Plan;

Registration Statement (Form S-8 No. 333-148635) pertaining to the IBERIABANK Corporation Deferred Compensation Plan;

Registration Statement (Form S-8 No. 333-151754) pertaining to the IBERIABANK Corporation 2008 Incentive Compensation Plan;

Registration Statement (Form S-8 No. 333-165877) pertaining to the IBERIABANK Corporation 2010 Stock Incentive Plan;

Registration Statement (Form S-8 No. 333-174717) pertaining to the IBERIABANK Corporation 2010 Stock Incentive Plan;

Registration Statement (Form S-8 No. 333-174719) pertaining to the OMNI BANCSHARES, Inc. Amended and Restated Performance and Equity Incentive Plan of IBERIABANK Corporation;

Registration Statement (Form S-8 No. 333-183220) pertaining to the Florida Gulf Bancorp, Inc. Officers’ and Employees’ Stock Option Plan of IBERIABANK Corporation;

Registration Statement (Form S-8 No. 333-184943) pertaining to the IBERIABANK Corporation Deferred Compensation Plan;

Registration Statement (Form S-8 No. 333-198040) pertaining to the IBERIABANK Corporation Retirement Savings Plan;

Registration Statement (Form S-8 No. 333-198041) pertaining to the IBERIABANK Corporation Amended and Restated 2010 Stock Incentive Plan; and    

Registration Statement (Form S-3 No. 333-202489) of IBERIABANK Corporation.

of our reports dated February 29, 2016, with respect to the consolidated financial statements of IBERIABANK Corporation and subsidiaries, and the effectiveness of internal control over financial reporting of IBERIABANK Corporation and subsidiaries included in this Annual Report (Form 10-K) for the year ended December 31, 2015.

/s/ Ernst & Young LLP

New Orleans, Louisiana

February 29, 2016

EX-31.1

EXHIBIT 31.1

CERTIFICATIONS

SECTION 302 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

I, Daryl G. Byrd, President and Chief Executive Officer of IBERIABANK Corporation, certify that:

1. I have reviewed this annual report on Form 10-K of IBERIABANK Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

4. The Registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the Registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the Registrant’s internal control over financial reporting that occurred during the Registrant’s most recent fiscal quarter (the Registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting; and

5. The Registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant’s auditors and the audit committee of the Registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant’s internal control over financial reporting.

Date: February 29, 2016	/s/ Daryl G. Byrd
	Daryl G. Byrd
	President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

SECTION 302 CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Anthony J. Restel, Senior Executive Vice President and Chief Financial Officer of IBERIABANK Corporation, certify that:

1. I have reviewed this annual report on Form 10-K of IBERIABANK Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

4. The Registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the Registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the Registrant’s internal control over financial reporting that occurred during the Registrant’s most recent fiscal quarter (the Registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting; and

5. The Registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant’s auditors and the audit committee of the Registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant’s internal control over financial reporting.

Date: February 29, 2016	/s/ Anthony J. Restel
	Anthony J. Restel
	Senior Executive Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of IBERIABANK Corporation (the “Company”) on Form 10-K for the fiscal year ended December 31, 2015 (the “Report”), I, Daryl G. Byrd, President and Chief Executive Officer of the Company, certify that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of and for the periods covered in the Report.

/s/ Daryl G. Byrd

Daryl G. Byrd

President and Chief Executive Officer

Date: February 29, 2016

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request. The information furnished herein shall not be deemed to be filed for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933.

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of IBERIABANK Corporation (the “Company”) on Form 10-K for the fiscal year ended December 31, 2015 (the “Report”), I, Anthony J. Restel, Senior Executive Vice President and Chief Financial Officer of the Company, certify that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of and for the periods covered in the Report.

/s/ Anthony J. Restel

Anthony J. Restel

Senior Executive Vice President and Chief Financial Officer

Date: February 29, 2016

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request. The information furnished herein shall not be deemed to be filed for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933.

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Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2015	Feb. 19, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	IBKC
Entity Registrant Name	IBERIABANK CORP
Entity Central Index Key	0000933141
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		41,260,334
Entity Public Float			$ 2.7

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Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 241,650	$ 251,994
Interest-bearing deposits in banks	268,617	296,101
Total cash and cash equivalents	510,267	548,095
Securities available for sale, at fair value	2,800,286	2,158,853
Securities held to maturity (fair values of $100,961 and $119,481, respectively)	98,928	116,960
Mortgage loans held for sale ($166,247 and $139,950 recorded at fair value, respectively)	166,247	140,072
Loans covered by loss share agreements	229,217	444,544
Non-covered loans, net of unearned income	14,098,211	10,996,500
Total loans, net of unearned income	14,327,428	11,441,044
Allowance for loan losses	(138,378)	(130,131)
Loans, net	14,189,050	11,310,913
FDIC loss share receivables	39,878	69,627
Premises and equipment, net	323,902	307,159
Goodwill	724,603	517,526
Other assets	650,907	588,699
Total Assets	19,504,068	15,757,904
Deposits:
Non-interest-bearing	4,352,229	3,195,430
Interest-bearing	11,826,519	9,325,095
Total deposits	16,178,748	12,520,525
Short-term borrowings	326,617	845,742
Long-term debt	340,447	403,254
Other liabilities	159,421	136,235
Total Liabilities	17,005,233	13,905,756
Shareholders’ Equity
Preferred stock, $1 par value - 5,000,000 shares authorized, Non-cumulative perpetual, liquidation preference $10,000 per share; 8,000 shares and 0 shares issued and outstanding, respectively, including related surplus	76,812	0
Common stock, $1 par value - 100,000,000 and 50,000,000 shares authorized, respectively; 41,139,537 issued and outstanding and 35,262,901 shares issued, respectively	41,140	35,263
Additional paid-in capital	1,797,982	1,398,633
Retained earnings	584,486	496,573
Accumulated other comprehensive income (loss)	(1,585)	7,525
Treasury stock at cost - 0 and 1,809,497 shares, respectively	0	(85,846)
Total Shareholders’ Equity	2,498,835	1,852,148
Total Liabilities and Shareholders’ Equity	$ 19,504,068	$ 15,757,904

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Securities held to maturity, fair values	$ 100,961	$ 119,481
Mortgage loans held for sale recorded at fair value	$ 166,247	$ 139,950
Preferred stock, par value (in usd per share)	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Liquidation preference (per share)	$ 10,000	$ 10,000
Preferred stock, shares issued	8,000	0
Preferred stock, shares outstanding	8,000	0
Common stock, par value (in usd per share)	$ 1	$ 1
Common stock, shares authorized	100,000,000	50,000,000
Common stock, shares issued	41,139,537	35,262,901
Common stock, shares outstanding	41,139,537	0
Treasury stock, shares	0	1,809,497

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest and Dividend Income
Loans, including fees	$ 606,966	$ 526,706	$ 488,936
Mortgage loans held for sale, including fees	6,164	5,153	5,108
Investment securities:
Taxable interest	47,380	38,815	31,562
Tax-exempt interest	5,785	5,862	6,668
Amortization of FDIC loss share receivable	(23,500)	(74,617)	(97,849)
Other	4,063	2,896	2,772
Total interest and dividend income	646,858	504,815	437,197
Deposits:
NOW and MMDA	27,226	18,483	18,933
Savings	740	325	309
Time deposits	19,137	14,282	16,604
Short-term borrowings	797	1,364	490
Long-term debt	11,200	10,250	10,617
Total interest expense	59,100	44,704	46,953
Net interest income	587,758	460,111	390,244
Provision for loan losses	30,908	19,060	5,145
Net interest income after provision for loan losses	556,850	441,051	385,099
Non-interest Income
Mortgage income	81,122	51,797	64,197
Service charges on deposit accounts	42,197	35,573	28,871
Title revenue	22,837	20,492	20,526
Broker commissions	17,592	18,783	16,333
ATM/debit card fee income	13,989	12,023	9,510
Income from bank owned life insurance	4,356	5,473	3,647
Gain on sale of available for sale securities	1,575	771	2,277
Other non-interest income	36,725	28,716	23,597
Total non-interest income	220,393	173,628	168,958
Non-interest Expense
Salaries and employee benefits	322,586	259,086	244,984
Net occupancy and equipment	68,541	59,571	58,037
Impairment of FDIC loss share receivables and other long-lived assets	6,954	6,437	37,893
Communication and delivery	13,506	12,029	12,024
Marketing and business development	13,176	11,707	10,143
Data processing	34,424	27,249	17,853
Amortization of acquisition intangibles	7,811	5,807	4,720
Professional services	22,368	18,975	18,217
Costs of OREO property, net	748	2,748	1,943
Credit and other loan related expense	16,653	13,692	15,853
Insurance	16,670	14,359	11,272
Travel and entertainment	9,525	9,033	8,126
Other non-interest expense	37,343	32,921	31,731
Total non-interest expense	570,305	473,614	472,796
Income before income tax expense	206,938	141,065	81,261
Income tax expense	64,094	35,683	16,133
Net Income	142,844	105,382	65,128
Income Available to Common Shareholders - Basic	142,844	105,382	65,128
Earnings Allocated to Unvested Restricted Stock	(1,680)	(1,651)	(1,205)
Earnings Allocated to Common Shareholders	$ 141,164	$ 103,731	$ 63,923
Earnings per common share - Basic (in usd per share)	$ 3.69	$ 3.31	$ 2.20
Earnings per common share - Diluted (in usd per share)	3.68	3.30	2.20
Cash dividends declared per common share (in usd per share)	$ 1.36	$ 1.36	$ 1.36
Comprehensive Income
Net Income	$ 142,844	$ 105,382	$ 65,128
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period (net of tax effects of $4,374, $13,202, and $21,733, respectively)	(8,124)	24,517	(40,362)
Reclassification adjustment for gains included in net income (net of tax effects of $551, $270 and $797, respectively)	(1,024)	(501)	(1,480)
Unrealized gains (losses) on securities, net of tax	(9,148)	24,016	(41,842)
Fair value of derivative instruments designated as cash flow hedges:
Change in fair value of derivative instruments designated as cash flow hedges during the period (net of tax effects of $20, $0 and $334, respectively)	38	0	619
Reclassification adjustment for losses included in net income (net of tax effects of $0, $0 and $136, respectively)	0	0	255
Fair value of derivative instruments designated as cash flow hedges, net of tax	38	0	874
Other comprehensive income (loss), net of tax	(9,110)	24,016	(40,968)
Comprehensive income	$ 133,734	$ 129,398	$ 24,160

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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Unrealized holding gains (losses) arising during the period, tax effect	$ 4,374	$ 13,202	$ 21,733
Reclassification adjustment for gains included in net income, tax effect	551	270	797
Change in fair value of derivative instruments designated as cash flow hedges during the period, tax effect	20	0	334
Reclassification adjustment for losses included in net income, tax effect	$ 0	$ 0	$ 136

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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands		Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock at Cost
Beginning balance (in shares) at Dec. 31, 2012			0	31,917,385
Beginning balance at Dec. 31, 2012		$ 1,529,210	$ 0	$ 31,917	$ 1,176,180	$ 410,814	$ 24,477	$ (114,178)
Increase (Decrease) in Shareholders' Equity
Net Income		65,128				65,128
Other comprehensive income (loss)		(40,968)					(40,968)
Cash dividends declared		(40,434)				(40,434)
Reissuance of treasury stock under incentive plans, net of shares surrendered in payment, including tax benefit		6,707			(607)			7,314
Stock issued		0			(7,992)			7,992
Share-based compensation cost		10,703			10,703
Ending balance (in shares) at Dec. 31, 2013			0	31,917,385
Ending balance at Dec. 31, 2013		1,530,346	$ 0	$ 31,917	1,178,284	435,508	(16,491)	(98,872)
Increase (Decrease) in Shareholders' Equity
Net Income		105,382				105,382
Other comprehensive income (loss)		24,016					24,016
Cash dividends declared		(44,317)				(44,317)
Reissuance of treasury stock under incentive plans, net of shares surrendered in payment, including tax benefit		10,071			3,242			6,829
Common stock issued for acquisitions (in shares)				3,345,516
Common stock issued for acquisitions		214,665		$ 3,346	211,319
Stock issued		0			(6,197)			6,197
Share-based compensation cost		11,985			11,985
Ending balance (in shares) at Dec. 31, 2014			0	35,262,901
Ending balance at Dec. 31, 2014		1,852,148	$ 0	$ 35,263	1,398,633	496,573	7,525	(85,846)
Increase (Decrease) in Shareholders' Equity
Net Income		142,844				142,844
Other comprehensive income (loss)		(9,110)					(9,110)
Cash dividends declared		(54,931)				(54,931)
Reclassification of treasury stock under the LBCA (in shares)	[1]			(1,809,497)
Reclassification of treasury stock under the LBCA	[1]	0		$ (1,809)	(84,037)			85,846
Common stock issued incentive plans, net of shares surrendered in payment, including tax benefit (in shares)				211,729
Common stock issued under incentive plans, net of shares surrendered in payment, including tax benefit		2,413		$ 212	2,201
Common stock issued for acquisitions (in shares)				7,474,404
Common stock issued for acquisitions		474,753		$ 7,474	467,279
Stock issued (in shares)			8,000
Stock issued		76,812	$ 76,812
Share-based compensation cost		13,906			13,906
Ending balance (in shares) at Dec. 31, 2015			8,000	41,139,537
Ending balance at Dec. 31, 2015		$ 2,498,835	$ 76,812	$ 41,140	$ 1,797,982	$ 584,486	$ (1,585)	$ 0

[1] Effective January 1, 2015, companies incorporated in Louisiana became subject to the Louisiana Business Corporation Act (“LBCA”), which eliminates the concept of treasury stock and provides that shares reacquired by a company are to be treated as authorized but unissued. Refer to Note 1 for further discussion.

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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash dividends declared per common share (in usd per share)	$ 1.36	$ 1.36	$ 1.36
Retained Earnings
Cash dividends declared per common share (in usd per share)	$ 1.36	$ 1.36	$ 1.36

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities
Net Income	$ 142,844	$ 105,382	$ 65,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	(6,178)	23,327	19,423
Provision for loan losses	30,908	19,060	5,145
Share-based compensation cost	13,906	11,985	10,703
Gain on sale of assets, net	(2,539)	(14)	(251)
Gain on sale of securities available for sale	(1,575)	(771)	(2,277)
Gain on sale of OREO, net	(5,552)	(4,221)	(6,022)
Impairment of FDIC loss share receivables and other long-lived assets	6,954	6,437	37,893
Amortization of premium/discount on securities, net	18,195	13,793	18,953
Expense (benefit) for deferred income taxes	4,551	(25,027)	(35,930)
Originations of mortgage loans held for sale	(2,464,588)	(1,675,538)	(2,116,460)
Proceeds from sales of mortgage loans held for sale	2,516,110	1,716,565	2,320,885
Gain on sale of mortgage loans held for sale, net	(83,131)	(59,156)	(65,393)
Tax benefit associated with share-based payment arrangements	(580)	(2,105)	(886)
Change in other assets, net of other assets acquired	13,925	11,770	(17,559)
Other operating activities, net	12,873	(22,124)	76,431
Net Cash Provided by Operating Activities	196,123	119,363	309,783
Cash Flows from Investing Activities
Proceeds from sales of securities available for sale	228,604	61,702	44,677
Proceeds from maturities, prepayments and calls of securities available for sale	473,142	488,699	709,977
Purchases of securities available for sale	(1,063,460)	(703,179)	(1,026,290)
Proceeds from maturities, prepayments and calls of securities held to maturity	22,939	36,182	55,706
Purchases of securities held to maturity	(5,833)	0	(5,901)
Reimbursement of recoverable covered asset losses (to) from the FDIC	(932)	5,734	68,233
Increase in loans, net of loans acquired	(703,946)	(824,437)	(1,030,545)
Proceeds from sale of premises and equipment	13,309	5,129	8,714
Purchases of premises and equipment, net of premises and equipment acquired	(19,502)	(29,841)	(16,941)
Proceeds from disposition of OREO	55,025	84,429	116,612
Cash paid for additional investment in tax credit entities	(9,671)	(13,191)	(2,213)
Cash received in excess of cash paid for acquisitions	425,581	188,803	0
Other investing activities, net	13,772	(12,785)	(2,636)
Net Cash Used in Investing Activities	(570,972)	(712,755)	(1,080,607)
Cash Flows from Financing Activities
Increase (decrease) in deposits, net of deposits acquired	968,746	641,026	(10,689)
Net change in short-term borrowings, net of borrowings acquired	(520,653)	110,298	377,299
Proceeds from long-term debt	63,198	54,637	2,867
Repayments of long-term debt	(201,259)	(22,871)	(144,609)
Cash dividends paid on common stock	(52,318)	(43,070)	(40,332)
Proceeds from common stock transactions	5,535	11,693	8,101
Payments to repurchase common stock	(3,620)	(3,727)	(2,280)
Net proceeds from issuance of preferred stock	76,812	0	0
Tax benefit associated with share-based payment arrangements	580	2,105	886
Net Cash Provided by Financing Activities	337,021	750,091	191,243
Net (Decrease) Increase In Cash and Cash Equivalents	(37,828)	156,699	(579,581)
Cash and Cash Equivalents at Beginning of Period	548,095	391,396	970,977
Cash and Cash Equivalents at End of Period	510,267	548,095	391,396
Supplemental Schedule of Non-cash Activities
Acquisition of real estate in settlement of loans	21,690	27,050	93,040
Common stock issued in acquisitions	474,753	214,665	0
Cash paid for:
Interest on deposits and borrowings	58,556	43,210	47,466
Income taxes, net	$ 53,476	$ 52,094	$ 29,063

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

GENERAL

The accompanying consolidated financial statements have been prepared in accordance with GAAP and practices generally accepted in the banking industry. The consolidated financial statements include the accounts of the Company and its subsidiaries.

When we refer to the “Company,” “we,” “our,” or “us” in this Report, we mean IBERIABANK Corporation and subsidiaries (consolidated). When we refer to the “Parent,” we mean IBERIABANK Corporation. See the Glossary of Acronyms at the end of this Report for terms used throughout this Report.

Reclassification

Certain amounts reported in prior periods have been reclassified to conform to the current period presentation. These reclassifications did not have a material effect on previously reported consolidated financial statements.

PRINCIPLES OF CONSOLIDATION

The Company’s consolidated financial statements include all entities in which the Company has a controlling financial interest under either the voting interest or variable interest model. The assessment of whether or not the Company has a controlling interest (i.e., the primary beneficiary) in a VIE is performed on an on-going basis. All equity investments in non-consolidated VIEs are included in "other assets" in the Company’s consolidated balance sheets. The Company’s maximum exposure to loss as a result of its involvement with non-consolidated VIEs was approximately $160 million and $151 million at December 31, 2015 and 2014, respectively. The Company's maximum exposure to loss was equivalent to the carrying value of its investments and any related outstanding loans to the non-consolidated VIEs.

Investments in entities that are not consolidated are accounted for under either the equity, cost, or proportional amortization method of accounting. Investments for which the Company has the ability to exercise significant influence over the operating and financing decisions of the entity are accounted for under the equity method. Investments for which the Company does not hold such ability are accounted for under the cost method. Investments in qualified affordable housing projects, which meet certain criteria, are accounted for under the proportional amortization method.

The consolidated financial statements include the accounts of the Company and its subsidiaries, IBERIABANK; Lenders Title Company; IBERIA Capital Partners, LLC; 1887 Leasing, LLC; IBERIA Asset Management, Inc.; 840 Denning, LLC; and IBERIA CDE, LLC. All significant intercompany balances and transactions have been eliminated in consolidation. All normal, recurring adjustments which, in the opinion of management, are necessary for a fair presentation of the financial statements have been included.

NATURE OF OPERATIONS

The Company offers commercial and retail banking products and services to customers throughout locations in seven states through IBERIABANK. The Company also operates mortgage production offices in 10 states through IMC and offers a full line of title insurance and closing services throughout Arkansas and Louisiana through LTC and its subsidiaries. ICP provides equity research, institutional sales and trading, and corporate finance services throughout the energy industry. 1887 Leasing, LLC owns an aircraft used by management of the Company. IAM provides wealth management and trust services for commercial and private banking clients. CDE is engaged in the purchase of tax credits.

USE OF ESTIMATES

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Material estimates that are susceptible to significant change in the near term are the allowance for credit losses, valuation of and accounting for acquired loans, goodwill and other intangibles, and income taxes.

CONCENTRATION OF CREDIT RISKS

Most of the Company’s business activity is with customers located within the states of Louisiana, Florida, Arkansas, Alabama, Texas, Georgia, and Tennessee. The Company’s lending activity is concentrated in its market areas in those states. The Company has emphasized originations of commercial loans and private banking loans, defined as loans to larger consumer clients. Repayments on loans are expected to come from cash flows of the borrower and/or guarantor. Losses on secured loans are limited by the value of the collateral upon default of the borrowers and guarantor support. The Company does not have any significant concentrations to any one industry or customer.

BUSINESS COMBINATIONS

Assets and liabilities acquired in business combinations are recorded at their acquisition date fair values. In accordance with ASC Topic 805, Business Combinations, the Company generally records provisional amounts at the time of acquisition based on the information available to the Company. The provisional estimates of fair values may be adjusted for a period of up to one year (“measurement period”) from the date of acquisition if new information obtained about facts and circumstances that existed as of the acquisition date, if known, would have affected the measurement of the amounts recognized as of that date. Subsequent to the Company's early adoption of ASU No. 2015-16 during the third quarter of 2015, adjustments recorded during the measurement period are recognized in the current reporting period.

Loans generally represent a significant portion of the assets acquired in the Company’s business acquisitions. If the Company discovers that it has materially underestimated the credit losses expected in the loan portfolio based on information available at the acquisition date within the measurement period, it will reduce or eliminate the gain and/or increase goodwill recorded on the acquisition in the period the adjustment is recorded. If the Company determines that losses arose subsequent to acquisition date, such losses are reflected as a provision for credit losses.

CASH AND CASH EQUIVALENTS

For purposes of presentation in the consolidated statements of cash flows, cash and cash equivalents are defined as cash, interest-bearing deposits, and non-interest-bearing demand deposits at other financial institutions with original maturities less than three months. IBERIABANK may be required to maintain average balances on hand or with the Federal Reserve Bank to meet regulatory reserve and clearing requirements. At December 31, 2015 and 2014, IBERIABANK had sufficient cash deposited with the Federal Reserve Bank to cover the required reserve balance.

INVESTMENT SECURITIES

Management determines the appropriate accounting classification of debt and equity securities at the time of acquisition and re-evaluates such designations at least quarterly. Debt securities that management has the ability and intent to hold to maturity are classified as HTM and carried at cost, adjusted for amortization of premiums and accretion of discounts using methods approximating the interest method. Securities acquired with the intention of recognizing short-term profits or which are actively bought and sold are classified as trading securities and reported at fair value, with unrealized gains and losses recognized in earnings. Securities not classified as HTM or trading, including equity securities with readily determinable fair values, are classified as AFS and recorded at fair value, with unrealized gains and losses excluded from earnings and reported in AOCI. Credit-related declines in the fair value of debt and marketable equity securities that are considered OTTI are recorded in earnings.

The Company evaluates its investment securities portfolio on a quarterly basis for indicators of OTTI. Declines in the fair value of individual HTM and AFS securities below their amortized cost basis are reviewed to determine whether the declines are other than temporary. In estimating OTTI losses, management considers 1) the length of time and the extent to which the fair value has been less than the amortized cost basis, 2) the financial condition and near-term prospects of the issuer, 3) its intent to sell and whether it is more likely than not that the Company would be required to sell those securities before the anticipated recovery of the amortized cost basis, and 4) for debt securities, the recovery of contractual principal and interest.

For securities that the Company does not expect to sell, or it is not more likely than not it will be required to sell prior to recovery of its amortized cost basis, the credit component of an OTTI is recognized in earnings and the non-credit component is recognized in AOCI. For securities that the Company does expect to sell, or it is more likely than not that it will be required to sell prior to recovery of its amortized cost basis, both the credit and non-credit component of an OTTI are recognized in earnings. Subsequent to recognition of OTTI, an increase in expected cash flows is recognized as a yield adjustment over the remaining expected life of the security based on an evaluation of the nature of the increase.

Nonmarketable equity securities include stock acquired for regulatory purposes, such as Federal Home Loan Bank stock and Federal Reserve Bank stock. These securities are accounted for at amortized cost, evaluated for impairment at least quarterly, and included in "other assets".

Gains or losses on securities sold are recorded on the trade date, using the specific identification method.

LOANS HELD FOR SALE

Loans and loan commitments which the Company does not have the intent and ability to hold for the foreseeable future or until maturity or payoff are classified as loans held for sale at the time of origination or acquisition. Subsequent to origination or acquisition, if the Company no longer has the intent or ability to hold a loan for the foreseeable future, generally a decision has been made to sell the loan, and it is classified within loans held for sale. Unless the fair value option has been elected at origination or acquisition, loans classified as held for sale are carried at the lower of cost or fair value. Amortization/accretion of remaining unamortized net deferred loan fees or costs and discounts or premiums (if applicable) ceases when a loan is classified as held for sale.

Loans held for sale primarily consist of fixed rate single-family residential mortgage loans originated and under contract to be sold in the secondary market. Mortgage loans originated and held for sale are recorded at fair value under the fair value option, unless otherwise noted. For mortgage loans for which the Company has elected the fair value option, gains and losses are included in mortgage income. For any other loans held for sale, net unrealized losses, if any, are recognized through a valuation allowance that is recorded as a charge to non-interest income. See Note 20 for further discussion of the determination of fair value for loans held for sale. In most cases, loans in this category are sold within thirty days and are generally sold with the mortgage servicing rights released. Buyers generally have recourse to return a purchased loan or request reimbursement for the loan premium or servicing rights under limited circumstances. Recourse conditions may include prepayment, payment default, breach of representations or warranties, and documentation deficiencies. During 2015 and 2014, an insignificant number of loans were returned to the Company. At December 31, 2015 and 2014, the recorded repurchase liability associated with transferred loans was immaterial.

LOANS

Legacy (Loans originated by the Company)

The Company originates mortgage, commercial, and consumer loans for customers. Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the unpaid principal balances, less the ALL, charge-offs, and unamortized net loan origination fees and direct costs, except for loans which are carried at fair value. Interest income is accrued as earned over the term of the loans based on the principal balance outstanding. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield.

Acquired (Loans acquired through Business Combinations)

Acquired loans are recorded at fair value on the acquisition date in accordance with ASC Topic 820, Fair Value Measurement, consistent with the exit price concept on the date of acquisition. Credit risk assumptions and any resulting credit discounts are included in the determination of fair value. Therefore, an ACL is not recorded at the acquisition date. The determination of fair value includes estimates related to discount rates, expected prepayments, and the amount and timing of undiscounted expected principal, interest, and other cash flows.

Acquired loans are evaluated at acquisition and classified as purchased impaired (“acquired impaired”) or purchased non-impaired (“acquired non-impaired”). Purchased impaired loans reflect credit deterioration since origination to the extent that it is probable at the time of acquisition that the Company will be unable to collect all contractually required payments. At the time of acquisition, purchased impaired loans are accounted for individually or aggregated into loan pools with similar characteristics, which include:

• whether the loan is performing according to contractual terms at the time of acquisition,

• the loan type based on regulatory reporting guidelines, namely whether the loan was a mortgage, consumer, or commercial loan,

• the nature of collateral,

• the interest rate type, whether fixed or variable rate, and

• the loan payment type, primarily whether the loan is amortizing or interest-only.

From these pools, the Company uses certain loan information, including outstanding principal balance, estimated expected losses, weighted average maturity, weighted average term to re-price (if a variable rate loan), weighted average margin, and weighted average interest rate to estimate the expected cash flow for each loan pool.

For purchased impaired loans, expected cash flows at the acquisition date in excess of the fair value of loans are recorded as interest income over the life of the loans using a level yield method if the timing and amount of future cash flows is reasonably estimable. For purchased non-impaired loans, the difference between the fair value and unpaid principal balance of the loan at acquisition, referred to as a purchase premium or discount, is amortized or accreted to income over the estimated life of the loans as an adjustment to yield.

Subsequent to acquisition, the Company performs cash flow re-estimations at least quarterly for each purchased impaired loan and/or loan pool. Increases in estimated cash flows above those expected at acquisition are recognized on a prospective basis as interest income over the remaining life of the loan and/or pool. Decreases in expected cash flows subsequent to acquisition generally result in recognition of a provision for credit loss. The measurement of cash flows involves several assumptions and judgments (i.e., prepayments, default rates, loss severity, etc.). All of these factors are inherently subjective and significant changes in the cash flow estimations can result over the life of the loan.

Classification

The Company’s loan portfolio is disaggregated into portfolio segments for purposes of determining the ACL. The Company’s portfolio segments include commercial, residential mortgage, and consumer and other loans, bifurcated between legacy and acquired. The Company further disaggregates each commercial, residential mortgage, and consumer and other loans portfolio segment into classes for purposes of monitoring and assessing credit quality based on certain risk characteristics. Classes within the commercial loan portfolio segment include commercial real estate-construction, commercial real estate-other, commercial and industrial, and energy-related. Classes within the consumer and other loans portfolio segment include home equity, indirect automobile, credit card, and consumer-other.

Troubled Debt Restructurings

The Company periodically grants concessions to its customers in an attempt to protect as much of its investment as possible and minimize risk of loss. These concessions may include restructuring the terms of a loan to alleviate the burden of the customer’s near-term cash requirements. In order to be classified a TDR, the Company must conclude that the restructuring constitutes a concession and the customer is experiencing financial difficulties. The Company defines a concession to the customer as a modification of existing terms for economic or legal reasons that it would otherwise not consider. The concession is either granted through an agreement with the customer or is imposed by a court or law. Concessions include modifying original loan terms to reduce or defer cash payments required as part of the loan agreement, including but not limited to:

• a reduction of the stated interest rate for the remaining original life of the loan,

• extension of the maturity date or dates at a stated interest rate lower than the current market rate for new loans with similar risk characteristics,

• reduction of the face amount or maturity amount of the loan as stated in the agreement, or

• reduction of accrued interest receivable on the loan.

In its determination of whether the customer is experiencing financial difficulties, the Company considers numerous indicators, including, but not limited to:

• whether the customer is currently in default on its existing loan(s), or is in an economic position where it is probable the customer will be in default on its loan(s) in the foreseeable future without a modification,

• whether the customer has declared or is in the process of declaring bankruptcy,

• whether there is substantial doubt about the customer’s ability to continue as a going concern,

• whether, based on its projections of the customer’s current capabilities, the Company believes the customer’s future cash flows will be insufficient to service the loan, including interest, in accordance with the contractual terms of the existing agreement for the foreseeable future, and

• whether, without modification, the customer cannot obtain sufficient funds from other sources at an effective interest rate equal to the current market rate for a similar loan for a non-troubled debtor.

If the Company concludes that both a concession has been granted and the customer is experiencing financial difficulties, the Company identifies the loan as a TDR. All TDRs are considered impaired loans.

NON-ACCRUAL AND PAST DUE LOANS (INCLUDING LOAN CHARGE-OFFS)

Loans are considered past due when contractual payments of principal and interest have not been received within 30 days from the contractual due date.

All legacy and purchased non-impaired loans are placed on non-accrual status when collection of principal or interest is in doubt. Purchased impaired loans are placed on non-accrual status when the Company cannot reasonably estimate cash flows on a loan or loan pool. Legacy and purchased non-impaired loans are evaluated for potential charge-off in accordance with the parameters discussed in the following paragraph or when the loan is placed on non-accrual status, whichever is earlier.

Loans within the commercial portfolio (except for purchased impaired) are generally evaluated for charge-off at 90 days past due, unless both well-secured and in the process of collection. Closed and open-end residential mortgage and consumer loans (except for purchased impaired) are evaluated for charge-off no later than 120 days past due. Any outstanding loan balance in excess of the fair value of the collateral less costs to sell is charged-off no later than 120 days past due for loans secured by real estate. For non-real estate secured loans, in lieu of charging off the entire loan balance, loans may be written down to the fair value of the collateral less costs to sell if repossession of collateral is assured and in process. 

The accrual of interest, as well as the amortization/accretion of any remaining unamortized net deferred fees or costs and discount or premium, is discontinued at the time the loan is placed on non-accrual status. All accrued but uncollected interest for loans that are placed on non-accrual status is reversed, with current year accruals charged to interest income and prior year amounts charged-off as a credit loss. Cash receipts received on non-accrual loans are generally applied against principal until the loan has been collected in full, after which time any additional cash receipts are recognized as interest income (i.e., cost recovery method). However, interest may be accounted for under the cash-basis method as long as the remaining recorded investment in the loan is deemed fully collectible.

Loans are returned to accrual status when the borrower has demonstrated a capacity to continue payment of the debt and collection of contractually required principal and interest associated with the debt is reasonably assured. At such time, the accrual of interest and amortization/accretion of any remaining unamortized net deferred fees or costs and discount or premium shall resume. Any interest income which was applied to the principal balance shall not be reversed and subsequently will be recognized as an adjustment to yield over the remaining life of the loan.

IMPAIRED LOANS

For all classes within the commercial portfolio, all loans with an outstanding commitment balance above a specific threshold are evaluated on a quarterly basis for potential impairment. Generally, mortgage and consumer loans within any class are not individually evaluated on a regular basis for impairment. All TDRs, regardless of the outstanding balance amount or portfolio classification, and all purchased impaired loans are considered to be impaired.

A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal and/or interest when due, according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Impairment losses are measured on a loan-by-loan basis for commercial and certain mortgage or consumer loans, based on either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent. This measurement requires significant judgment and use of estimates, and the actual loss ultimately recognized by the Company may differ significantly from the estimates.

ALLOWANCE FOR CREDIT LOSSES

The Company maintains the ACL at a level that management believes appropriate to absorb estimated probable credit losses incurred in the loan portfolios (including unfunded commitments) as of the consolidated balance sheet date. The ACL consists of the allowance for loan losses (contra asset) and the reserve for unfunded commitments (liability). The manner in which the ACL is determined is based on 1) the accounting method applied to the underlying loans and 2) whether the loan is required to be measured for impairment in accordance with ASC Topic 450-20, Contingencies - Loss Contingencies or ASC Topic 310-10-35, Receivables - Overall. The Company delineates between loans accounted for under the contractual yield method, legacy and purchased non-impaired loans, and purchased impaired loans (loans accounted for in accordance with ASC Topic 310-30, Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality). Further, for legacy and acquired non-impaired loans, the Company attributes portions of the ACL to loans and loan commitments that it measures individually (ASC Topic 310-10-35, Receivables - Overall), impaired credit, and groups of homogeneous loans and loan commitments that it measures collectively (ASC Topic 450-20, Contingencies - Loss Contingencies).

Determination of the appropriate ACL involves a high degree of complexity and requires significant judgment regarding the credit quality of the loan portfolio. Several factors are taken into consideration in the determination of the overall ACL, including a qualitative component. These factors include, but are not limited to, the overall risk profiles of the loan portfolios, net charge-off experience, the extent of impaired loans, the level of non-accrual loans, the level of 90 days past due loans, the value of collateral, the ability to monetize guarantor support, and the overall percentage level of the allowance relative to the loan portfolio, amongst other factors. The Company also considers overall asset quality trends, changes in lending practices and procedures, trends in the nature and volume of the loan portfolio, including the existence and effect of any portfolio concentrations, changes in experience and depth of lending staff, the Company’s legal, regulatory and competitive environment, national and regional economic trends, data availability and applicability that might impact the portfolio or the manner in which it estimates losses, and risk rating accuracy and risk identification.

The allowance for loan losses for all impaired loans (excluding purchased impaired) is determined on an individual loan basis, considering the facts and circumstances specific to each borrower. The allowance is based on the difference between the recorded investment in the loan and generally either the estimated net present value of projected cash flows or the estimated value of the collateral associated with the loan, if the loan is deemed collateral-dependent. For non-impaired loans (excluding purchased impaired), the allowance for loan losses is calculated based on pools of loans with similar characteristics. The pool level allowance is calculated through the application of a PD (i.e., probability of default) and LGD (i.e., loss given default) factor for each individual loan. PDs and LGDs are determined based on historical default and loss information for similar loans. For purposes of establishing estimated loss percentages for pools of loans that share common risk characteristics, the Company’s loan portfolio is segmented by various loan characteristics including loan type, risk rating (commercial), Vantage or FICO score (mortgage and consumer), past due status (mortgage and consumer) and call report code. The default and loss information is measured over an appropriate period for each loan pool and adjusted as deemed appropriate. Qualitative adjustments are incorporated into the pool level analysis to accommodate for the imprecision of certain assumptions and uncertainties inherent in the calculation. See the "Loans" section of this Footnote for discussion of the determination of the ACL for purchased impaired loans.

Certain inherent, but unconfirmed losses are probable within the loan portfolio. The Company’s current methodology for determining the level of losses is based on historical loss rates, current credit grades, specific allocation, and other qualitative adjustments. In a stable or deteriorating credit environment, heavy reliance on historical loss rates and the credit grade rating process results in model-derived required reserves that tend to slightly lag behind portfolio deterioration. Similar lags can occur in an improving credit environment whereby required reserves can lag slightly behind portfolio improvement. Given these model limitations, qualitative adjustment factors may be incremental or decremental to the quantitative model results. In periods prior to 2015, the Company estimated incurred losses on its Exploration and Production and its Oil Field Services portfolios as an aggregate portfolio. Beginning in 2015, as the performance of these two portfolios began to diverge, the Company disaggregated the analysis of incurred losses within these portfolios, which included modifying its LGD estimates for the E&P portfolio to more closely align with published industry data. Absent this change, the Company would have recorded an additional $10.0 million, or 17 cents per share, in provision expense for the year ended December 31, 2015. 

The reserve for unfunded commitments is determined using similar methodologies described above for non-impaired loans. The loss factors used in the reserve for unfunded commitments are equivalent to the loss factors used in the allowance for loan losses, while also considering utilization of unused commitments.

FDIC LOSS SHARE RECEIVABLE

The Company entered into arrangements with the FDIC which obligate the FDIC to reimburse the Company for losses on certain loans associated with FDIC-assisted transactions. The indemnification assets were recorded at fair value as of the acquisition dates. The initial values of the indemnification assets were based on estimated cash flows to be received over the expected life of the acquired assets, not to exceed the term of the indemnification agreements. The reimbursable loss periods, excluding single family residential assets, ended in 2014 for three acquisitions, ended during 2015 for one acquisition, and will end during 2016 for two acquisitions. The reimbursable loss periods for single family residential assets will end in 2019 for three acquisitions, in 2020 for one acquisition, and in 2021 for two acquisitions. Assets are covered through expiration of the loss share term, at which point such assets are considered non-covered.

Because the indemnification assets are measured on the same basis as the indemnified (covered) loans, subject to contractual and collectibility limitations, the indemnification assets are impacted by changes in expected cash flows on covered assets. Increases in credit losses expected to occur within the loss share term are generally recorded as current period increases to the ACL and increase the amount collectible from the FDIC by the applicable loss share percentage. Decreases in credit losses expected to occur within the loss share term reduce the amount collectible from the FDIC and increase the amount collectible from customers in the form of prospective accretion on loans. Increases in the portion of indemnification asset collectible from customers are amortized to income. Periodic amortization represents the amount that is expected to result in symmetrical recognition of pool-level accretion and amortization over the shorter of 1) the life of the loan or 2) the life of the shared loss agreement.

The Company assesses the indemnification assets for collectibility at the acquisition level based on three sources: 1) the FDIC, 2) OREO transactions, and 3) customers. Amounts collectible from the FDIC through loss reimbursements are comprised of losses currently expected within the loss share term. A current period impairment would be recorded to the extent that events or circumstances indicate that losses previously expected to occur within the loss share term are expected to occur subsequent to loss share termination. Amounts collectible through expected gains on the sale of OREO are written-up or impaired each period based on the best available information.

Loss assumptions used to measure the basis of the indemnified loans are consistent with the loss assumptions used to measure the indemnification assets.

PREMISES AND EQUIPMENT

Land is carried at cost. Buildings, furniture, fixtures, and equipment are carried at cost, less accumulated depreciation computed on a straight-line basis over the estimated useful lives of 10 to 40 years for buildings and 3 to 15 years for furniture, fixtures, and equipment. Leasehold improvements are amortized over the lease term, including any renewal periods that are reasonably assured, or the asset’s useful life, whichever is shorter. Premises and equipment are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.

SOFTWARE

Software is amortized on a straight-line basis over its estimated useful life. The estimated useful life of software is generally three years, but can vary depending on the specific facts and circumstances. Software is evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the software may not be recoverable. Software is recorded within "other assets" on the Company’s consolidated balance sheets with carrying amounts at December 31, 2015 and 2014 of $6.2 million and $7.9 million, respectively.

GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

Goodwill represents the excess of the consideration paid in a business combination over the fair value of the identifiable net assets acquired. Goodwill is not amortized, but is assessed for potential impairment at a reporting unit level on an annual basis, as of October 1^st, or whenever events or changes in circumstances indicate that it is more likely than not the fair value of a reporting unit is less than its respective carrying amount. As part of its testing, the Company may elect to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the results of the qualitative assessment indicate that more likely than not a reporting unit’s fair value is less than its carrying amount, the Company determines the fair value of the respective reporting unit (through the application of various quantitative valuation methodologies) relative to its carrying amount to determine whether quantitative indicators of potential impairment are present (i.e., Step 1). The Company may also elect to bypass the qualitative assessment and begin with Step 1. If the results of Step 1 indicate that the fair value of the reporting unit may be below its carrying amount, the Company determines the fair value of the reporting unit’s assets and liabilities, considering deferred taxes, and then measures impairment loss by comparing the implied fair value of goodwill with the carrying amount of that goodwill (i.e., Step 2).

Title Plant

Costs incurred to construct a title plant, including the costs incurred to obtain, organize, and summarize historical information, are capitalized until the title plant can be used to perform title searches. A purchased title plant, including a purchased undivided interest in a title plant, is recorded at cost at the date of acquisition. For a title plant acquired separately or as part of a company acquisition, cost is measured as the fair value of the consideration given. Capitalized costs of a title plant are not depreciated or charged to income unless circumstances indicate that the carrying amount of the title plant has been impaired. Impairment indicators include a change in legal requirements or statutory practices, identification of obsolescence, or abandonment of the title plant, among other indicators.

Capitalized storage and retrieval costs (e.g., costs to convert from one storage retrieval system to another or to modernize the storage and retrieval systems) incurred after a title plant is operational are charged to expense in a systematic and rational manner. Title plant is recorded within "other assets" on the Company’s consolidated balance sheets.

Intangible assets subject to amortization

The Company’s acquired intangible assets that are subject to amortization include (amongst other ancillary intangibles described in Note 10) core deposit intangibles, amortized on a straight-line or accelerated basis, and a customer relationship intangible asset, amortized on an accelerated basis, over average lives not to exceed 10 years. The Company reviews intangible assets for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Impairment is identified if the sum of the undiscounted estimated future cash flows is less than the carrying value of the asset.Intangible assets are recorded within "other assets" on the Company’s consolidated balance sheets.

OTHER REAL ESTATE OWNED

Other real estate owned includes all real estate, other than bank premises used in bank operations, owned or controlled by the Company, including real estate acquired in settlement of loans. Properties are initially recognized at the recorded investment of the loan (which is the pro-rata carrying value of loans accounted for in accordance with ASC Topic 310-30, Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality) or at estimated fair value less costs to sell, whichever is less, generally when the Company has received physical possession (legal title is not required for non-consumer residential property). The amount by which the recorded investment of the loan exceeds the fair value less costs to sell of the property is charged to the ALL. Subsequent to foreclosure, the assets are carried at the lower of cost or fair value less costs to sell. Former bank properties transferred to OREO are recorded at the lower of cost or market. Subsequent declines in the fair value of other real estate are recorded as adjustments to the carrying amount through a valuation allowance. Revenue and expenses from operations, gain or loss on sale, and changes in the valuation allowance are included in net expenses from foreclosed assets. The Company included property write-downs of $4.0 million and $3.8 million in earnings for the years ended December 31, 2015 and 2014, respectively. OREO is recorded within "other assets" on the Company’s consolidated balance sheets.

DERIVATIVE FINANCIAL INSTRUMENTS

The Company enters into various derivative financial instruments to manage interest rate risk, asset sensitivity, and other exposures such as liquidity and credit risk, as well as to facilitate customer transactions. The primary types of derivatives utilized by the Company include interest rate swap agreements, interest rate lock commitments, forward sales commitments, and written and purchased options. All derivative instruments are recognized on the consolidated balance sheets as "other assets" or "other liabilities" at fair value, regardless of whether a right of offset exists. Changes in the fair value (i.e., gains or losses) of a derivative instrument are recorded based on whether it has been designated and qualifies as part of a hedging relationship.

To facilitate customer transactions that are entered outside of the Company's risk management strategies, the Company enters into derivative instruments to allow its commercial customers to manage their exposure to interest rate fluctuations or to facilitate business transactions. These derivative instruments, including interest rate swap agreements and foreign exchange contracts, are not designated for hedge accounting (i.e., economic hedges). To mitigate the market risk associated with these customer contracts, the Company enters into offsetting derivative contract positions. The Company manages its credit risk, or potential risk of default, by its commercial customers through credit limit approval and monitoring procedures.

Derivatives Designated in Hedging Relationships

For cash flow hedges, the effective portion of the gain or loss related to the derivative instrument is initially reported as a component of OCI and subsequently reclassified into earnings when the forecasted transaction affects earnings or when the hedge is terminated. The ineffective portion of the gain or loss, if any, is reported in earnings immediately, in either "other income" or "other expense", respectively. In applying hedge accounting for derivatives (ASC Topic 815-30 Derivatives and Hedging - Cash Flow Hedges), the Company establishes and documents a method for assessing the effectiveness of the hedging derivative and a measurement approach for determining the ineffective aspect of the hedge upon the inception of the hedge.

Derivatives Not Designated in Hedging Relationships

For derivative instruments that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately.

Common Types of Derivatives

Interest rate swap agreements

Interest rate swaps are agreements to exchange interest payments based upon notional amounts. The exchange of payments typically involves paying a fixed rate and receiving a variable rate or vice versa.

As part of its activities to manage interest rate risk (i.e., the exposure to the variability of future cash flows or other forecasted transactions due to fluctuating market rates), the Company enters into interest rate contracts, which typically include interest rate swap agreements. The Company primarily utilizes these instruments, which the Company designates as cash flow hedges, to convert a portion of its variable-rate loans or debt to a fixed rate.

Interest rate lock commitments

The Company enters into commitments to originate mortgage loans intended for sale whereby the interest rate on the prospective loan is determined prior to funding (“rate lock”). A rate lock is provided to a borrower, subject to conditional performance obligations, for a specified period of time that typically does not exceed 60 days. Rate lock commitments on mortgage loans that are intended to be sold are recognized as derivatives. Accordingly, such commitments are recorded at fair value as derivative assets or liabilities, with changes in fair value recorded in mortgage income on the consolidated statements of comprehensive income.

Forward sales commitments

The Company uses forward sales commitments to protect the value of its rate locks and mortgage loans held for sale from changes in interest rates and pricing between the origination of the rate lock and sale of these loans, as changes in interest rates have the potential to cause a decline in value of rate locks and mortgage loans included in the held for sale portfolio. These commitments are recognized as derivatives and recorded at fair value as derivative assets or liabilities, with changes in fair value recorded in mortgage income on the consolidated statements of comprehensive income.

Equity-indexed certificates of deposit

IBERIABANK offers its customers a certificate of deposit that provides the purchaser a guaranteed return of principal at maturity plus a potential return, which allows IBERIABANK to identify a known cost of funds. The rate of return is based on the performance of a group of publicly traded stocks that represent a variety of industry segments. Because it is based on an equity index, the rate of return represents an embedded derivative that is not clearly and closely related to the host instrument and is to be accounted for separately. Accordingly, the certificate of deposit is separated into two components: a zero coupon certificate of deposit (the host instrument) and a written option purchased by the depositor (an embedded derivative). The discount on the zero coupon deposit is amortized over the life of the deposit, and the written option is carried at fair value on the Company’s consolidated balance sheets, with changes in fair value recorded through earnings. IBERIABANK offsets the risks of the written option by purchasing an option with terms that mirror the written option, which is also carried at fair value on the Company’s consolidated balance sheets.

OFF-BALANCE SHEET CREDIT-RELATED FINANCIAL INSTRUMENTS

In the ordinary course of business, the Company executes various commitments to extend credit, including commitments under commercial construction arrangements, commercial and home equity lines of credit, credit card arrangements, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded on the funding date.

TRANSFERS OF FINANCIAL ASSETS

Transfers of financial assets, or portions thereof which meet the definition of a participating interest, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when 1) the assets have been legally isolated from the Company, 2) the transferee obtains the right, free of conditions that constrain it from taking advantage of that right and provide the Company with more than a trivial benefit, to pledge or exchange the transferred assets, and 3) the Company does not maintain effective control over the transferred assets. Should the transfer not satisfy all three criteria, the transaction is recorded as a secured financing.

If the transfer is accounted for as a sale, the transferred assets are derecognized from the Company’s balance sheet and a gain or loss on sale is recognized. If the transfer is accounted for as a secured borrowing, the transferred assets remain on the Company’s balance sheet and the proceeds from the transaction are recognized as a liability.

Mortgage Servicing Rights

The Company recognizes the rights to service mortgage loans as separate assets, which are recorded in "other assets" in the consolidated balance sheets, when purchased or when servicing is contractually separated from the underlying mortgage loans by sale with servicing rights retained.

For loan sales with servicing retained, a servicing right (generally an asset) is recorded at fair value for the right to service the loans sold. All servicing rights are identified by class and subsequently accounted for under the amortization method.

INCOME TAXES

The Company and all subsidiaries file a consolidated Federal income tax return on a calendar year basis. The Company files income tax returns in the U.S. Federal jurisdiction and various state and local jurisdictions through IBERIABANK Corporation (Parent), IBERIABANK, IMC, LTC, and their subsidiaries. In lieu of Louisiana state income tax, IBERIABANK is subject to the Louisiana bank shares tax, portions of which are included in both "non-interest expense" and "income tax expense" in the Company’s consolidated statements of comprehensive income. With few exceptions, the Company is no longer subject to U.S. federal, state or local income tax examinations for years before 2011.

Deferred income tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the temporary differences between the book and tax bases of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. The measurement of deferred tax assets is reduced, if necessary, by the amount of any tax benefits that, based on available evidence, are not expected to be realized.

The Company recognizes interest and penalties accrued related to unrecognized tax benefits, if applicable, in "non-interest expense".

SHARE-BASED COMPENSATION PLANS

The Company issues stock options, restricted stock awards, restricted share units, performance units, and phantom awards under various plans to directors, officers, and other key employees. Compensation cost for all awards is recognized on a straight-line basis over the requisite service period, which is generally the vesting period, taking into account retirement eligibility. For service awards with graded vesting, the Company recognizes compensation cost on a straight-line basis. The majority of the Company's share-based awards qualify for equity accounting and contain service conditions. Under equity accounting, the fair value of the award is measured at the grant date and not subsequently remeasured.

In accordance with ASC 718 Compensation - Stock Compensation, for awards that contain a market condition, the Company includes the market condition in the determination of the grant date fair value of the award. Compensation cost for an award with a market condition is recognized regardless of whether the market condition is satisfied, assuming the requisite service is met. The Company does not include performance conditions in the determination of the grant date fair value of the award. Compensation cost for an award with a performance condition is not recognized if the performance condition is not satisfied. Phantom awards and performance units, accounted for as liability awards, are remeasured at each reporting period based on their fair value until the date of settlement. Compensation cost for each reporting period until settlement is based on the change (or a portion of the change, depending on the percentage of the requisite service that has been rendered at the reporting date) in the fair value of the phantom award and performance unit for each reporting period.

Compensation expense relating to share-based awards is recognized in net income as part of “salaries and employee benefits” on the consolidated statements of comprehensive income for employees and “professional services” for non-employee directors. The exercise price for the options granted by the Company is not less than the fair market value of the underlying stock at the grant date.

EARNINGS PER COMMON SHARE

Basic earnings per share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflects additional common shares that would have been outstanding if dilutive potential common shares, in the form of stock options or restricted stock units, had been issued, as well as any adjustment to income that would result from the assumed issuance. Participating common shares issued by the Company relate to unvested outstanding restricted stock awards, the earnings allocated to which are used in determining income available to common shareholders under the two-class method. The two-class method allocates earnings for the period between common shareholders and other participating securities holders. The participating awards receiving dividends are allocated the same percentage of income as if they were outstanding shares.

SHARE REPURCHASES

Repurchases of the Company’s common stock are recorded at cost.

Effective January 1, 2015, companies incorporated in Louisiana became subject to the Louisiana Business Corporation Act (which replaced the Louisiana Business Corporation Law). Provisions of the Louisiana Business Corporation Act eliminated the concept of treasury stock and provide that shares reacquired by a company are to be treated as authorized but unissued shares. As a result of this change in law, for the consolidated financial statements beginning with the quarterly period ended March 31, 2015, the Company classifies shares previously classified as treasury stock as a reduction to issued shares of common stock, and accordingly, adjusts the stated value of common stock and paid-in-capital.

COMPREHENSIVE INCOME

Accounting principles generally require that recognized revenue, expenses, gains, and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities and cash flow hedges, are reported as a separate component of the shareholders’ equity section of the consolidated balance sheets, such items, along with net income, are components of comprehensive income.

FAIR VALUE MEASUREMENTS

Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company estimates fair value based on the assumptions market participants would use when selling an asset or transferring a liability and characterizes such measurements within the fair value hierarchy based on the inputs used to develop those assumptions and measure fair value. The hierarchy requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:

• Level 1 - Quoted prices in active markets for identical assets or liabilities.

• Level 2 - Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

• Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies, and similar techniques that use significant unobservable inputs.

A description of the valuation methodologies used for instruments measured at fair value follows, as well as the classification of such instruments within the valuation hierarchy. The descriptions below are exclusive of assets or liabilities acquired in business combinations, as all such instruments are required to initially be measured at fair value.

Cash and cash equivalents

The carrying amounts of cash and cash equivalents approximate their fair value.

Investment securities

Securities are classified within Level 1 where quoted market prices are available in an active market. Inputs include securities that have quoted prices in active markets for identical assets. If quoted market prices are unavailable, fair value is estimated using quoted prices of securities with similar characteristics, at which point the securities are classified within Level 2 of the hierarchy.

Mortgage loans held for sale

Mortgage loans originated and held for sale are recorded at fair value under the fair value option, unless otherwise noted. When determining the fair value of loans held for sale, the Company obtains quotes or bids on these loans directly from the purchasing financial institutions (Level 2).

Loans

The fair values of non-covered mortgage loans are estimated based on present values using entry-value rates (the interest rate that would be charged for a similar loan to a borrower with similar risk at the indicated balance sheet date) at December 31, 2015 and 2014, weighted for varying maturity dates. Other non-covered loans are valued based on present values using entry-value interest rates at December 31, 2015 and 2014 applicable to each category of loans, which are classified within Level 3 of the hierarchy. Covered loans are measured using projections of expected cash flows, exclusive of the loss sharing agreements with the FDIC. Fair value of the covered loans reflects the current fair value of these loans, which is based on an updated estimate of the projected cash flow as of the dates indicated. The fair value associated with the loans includes estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows, which also are classified within Level 3 of the hierarchy.

Impaired loans

Loans are measured for impairment using the methods permitted by ASC Topic 310, Receivables. Fair value measurements are used in determining impairment using either the loan’s observable market price (Level 1), if available, or the fair value of the collateral, if the loan is collateral dependent (Level 2). Measuring the impairment of loans using the present value of expected future cash flows, discounted at the loan’s effective interest rate, is not considered a fair value measurement. Fair value of the collateral is determined by appraisals or independent valuation.

FDIC Loss Share Receivables

The fair value of FDIC loss share receivables are determined using projected cash flows from loss sharing agreements based on expected reimbursements for losses at the applicable loss sharing percentages based on the terms of the loss share agreements. Cash flows are discounted to reflect the timing and receipt of the loss sharing reimbursements from the FDIC. The fair value of the Company’s FDIC loss share receivables are categorized within Level 3 of the hierarchy.

Other real estate owned

Fair values of OREO are determined by sales agreement or appraisal and costs to sell are based on estimation per the terms and conditions of the sales agreement or amounts commonly used in real estate transactions. Inputs include appraisal values on the properties or recent sales activity for similar assets in the property’s market, and thus OREO measured at fair value is classified within Level 2 of the hierarchy.

Derivative financial instruments

Fair values of interest rate swaps, interest rate locks, forward sales commitments, and written and purchased options are estimated using prices of financial instruments with similar characteristics and thus are classified within Level 2 of the fair value hierarchy.

Deposits

The fair values of NOW accounts, money market deposits and savings accounts are the amounts payable on demand at the reporting date. Certificates of deposit are valued using a discounted cash flow model based on the weighted-average rate at December 31, 2015 and 2014 for deposits with similar remaining maturities. The fair value of the Company’s deposits are categorized within Level 3 of the fair value hierarchy.

Short-term borrowings

The carrying amounts of short-term borrowings maturing within ninety days approximate their fair values.

Long-term debt

The fair values of long-term debt are estimated using discounted cash flow analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. The fair value of the Company’s long-term debt is categorized within Level 3 of the fair value hierarchy.

Off-balance sheet items

The Company has outstanding commitments to extend credit and standby letters of credit. These off-balance sheet financial instruments are generally exercisable at the market rate prevailing at the date the underlying transaction will be completed. At December 31, 2015 and 2014, the fair value of guarantees under commercial and standby letters of credit was immaterial.

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Recent Accounting Pronouncements

12 Months Ended

Dec. 31, 2015

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

RECENT ACCOUNTING PRONOUNCEMENTS

ASU No. 2014-01

In January 2014, the FASB issued ASU No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). The ASU allows for use of the proportional amortization method for investments in qualified affordable housing projects, if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized in the consolidated statements of comprehensive income as a component of income tax expense. The ASU provides for a practical expedient, which allows for amortization of the investment in proportion to only the tax credits if it produces a measurement that is substantially similar to the measurement that would result from using both tax credits and other tax benefits.

The ASU was effective for fiscal years and interim periods beginning after December 15, 2014. The Company adopted this guidance effective January 1, 2015, utilizing the practical expedient method. Amortization expense related to qualified affordable housing investments has been presented net of the income tax credits in "income tax expense" in the consolidated statements of comprehensive income. The standard was required to be applied retrospectively; therefore, prior periods have been restated in accordance with GAAP. The impact of the adoption of ASU 2014-01 was not material to the consolidated financial statements in current or prior periods.

ASU No. 2014-09 and 2015-14

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which implements a common revenue standard and clarifies the principles used for recognizing revenue. The amendments in the ASU clarify that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. As part of that principle, the entity should identify the contract(s) with the customer, identify the performance obligation(s) of the contract, determine the transaction price, allocate that transaction price to the performance obligation(s) of the contract, and then recognize revenue when or as the entity satisfies the performance obligation(s).

In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date, which deferred the original effective date declared in ASU No. 2014-09 by one year. Accordingly, the amendments in ASU No. 2014-09 will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that annual reporting period. The amendments will be applied through the election of one of two retrospective methods.The Company is currently assessing the effect, but does not expect the adoption will have a significant impact on the Company’s consolidated financial statements.

ASU No. 2015-02

In February 2015, the FASB issued ASU No. 2015-02, Consolidation - Amendments to the Consolidation Analysis, which changes the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The amendments in the guidance: 1) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, 2) eliminate the presumption that a general partner should consolidate a limited partnership, 3) affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, and 4) provide a scope exception from consolidation guidance for certain investment funds.

ASU No. 2015-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The guidance may be applied using a modified retrospective approach by recording a cumulative effect adjustment to equity as of the beginning of the fiscal year of adoption. The amendments may also be applied retrospectively. The Company does not believe the adoption of the ASU will have a significant impact on the Company’s consolidated financial statements.

ASU No. 2015-03

In April 2015, the FASB issued ASU No. 2015-03, Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs, in an effort to comply with its simplification initiative to reduce complexity in accounting standards. ASU No. 2015-03 requires debt issuance costs related to a debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the debt liability. ASU No. 2015-03 does not affect recognition and measurement guidance for debt issuance costs.

ASU No. 2015-03 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The amendment will be applied retrospectively. The adoption of this ASU will not have a significant impact on the Company's consolidated financial statements.

ASU No. 2015-05

In April 2015, the FASB issued ASU No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement, which provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The determination of whether an arrangement contains a software license may impact the classification of the costs associated with the arrangement and the reporting period in which the costs are recognized as expense.

The amendments will be effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. The Company has determined it will elect to adopt the amendments prospectively to all arrangements entered into or materially modified beginning January 1, 2016. The amendments will be applied prospectively on an individual arrangement basis and the impact to the Company’s consolidated financial statements will vary depending on the terms and conditions of the individual arrangement.

ASU No. 2015-16

In September 2015, the FASB issued ASU No. 2015-16, Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments. ASU No. 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined and present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current period earnings by line item that would have been have been recorded in previous reporting periods if the adjustment had been recognized as of the acquisition date.

ASU No. 2015-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The guidance must be applied prospectively for adjustments to provisional amounts that occur after the effective date of this update with earlier application permitted for financial statements that have not been issued. The Company adopted this guidance effective September 30, 2015. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

ASU No. 2016-01

In January 2016, the FASB issued ASU No. 2016-01, Financial Statements - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments will not change the guidance for classifying and measuring investments in debt securities or loans; however, the significant amendments will include changes related to how entities measure certain equity investments, recognize changes in the fair value of financial liabilities measured under the fair value option that are attributable to instrument-specific credit risk, and disclose and present financial assets and liabilities on the Company’s consolidated financial statements.

Specifically, the aforementioned amendments will require measurement of equity investments at fair value, with changes recognized in net income, unless the investments qualify for the new practicability exception, the equity method of accounting, or consolidation. For financial liabilities measured using the fair value option, any change in fair value caused by a change in an entity’s own credit risk will be recognized separately in OCI, as opposed to earnings. The amendments will also require entities to present financial assets and financial liabilities separately, grouped by measurement category and form of financial asset in the statement of financial position or in the accompanying notes to the financial statements. Entities will also no longer have to disclose the methods and significant assumptions for financial instruments measured at amortized cost, but will be required to measure such instruments under the “exit price” notion for disclosure purposes.

ASU No. 2016-01 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. An entity will record a cumulative-effect adjustment to beginning retained earnings as of the beginning of the first reporting period in which the guidance is adopted, with two exceptions. The amendments related to equity investments without readily determinable fair values (including disclosure requirements) will be effective prospectively. The requirement to use the exit price notion to measure the fair value of financial instruments for disclosure purposes will also be applied prospectively. The Company is currently evaluating the impact of the ASU on the Company’s consolidated financial statements.

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Acquisition Activity

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Acquisition Activity

ACQUISITION ACTIVITY

2015 Acquisitions

Acquisition of Florida Bank Group, Inc.

On February 28, 2015, the Company acquired Florida Bank Group, Inc. ("Florida Bank Group"), the holding company of Florida Bank, a Tampa, Florida-based commercial bank servicing Tampa, Tallahassee and Jacksonville, Florida. Under the terms of the agreement, Florida Bank Group shareholders received a combination of cash and shares of the Company’s common stock. Florida Bank Group shareholders received cash equal to $7.81 per share of then outstanding Florida Bank Group common stock, including shares of preferred stock that converted to common shares in the acquisition. Each Florida Bank Group common share was exchanged for 0.149 of a share of the Company’s common stock, as well as a cash payment for any fractional share. All unexercised Florida Bank Group stock options at the closing date were settled for cash at fair value based on the closing price.

The Company acquired all of the outstanding common stock of the former Florida Bank Group shareholders for total consideration of $90.5 million, which resulted in goodwill of $15.7 million, as shown in the table below. With this acquisition, IBERIABANK entered the Tampa, Tallahassee and Jacksonville areas of Florida through the addition of 12 bank offices and an experienced in-market team that enhances IBERIABANK's ability to compete in those markets. The Company projects cost savings will be recognized in future periods through the elimination of redundant operations. The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	752,493	$	47,497
Total equity consideration		47,497
Non-Equity consideration
Cash		42,988
Total consideration paid		90,485
Fair value of net assets assumed including identifiable intangible assets		74,781
Goodwill		$	15,704

Acquisition of Old Florida Bancshares, Inc.

On March 31, 2015, the Company acquired Old Florida Bancshares, Inc. (“Old Florida”), the holding company of Old Florida Bank and New Traditions Bank, which were Orlando, Florida-based commercial banks. Under the terms of the agreement, for each share of Old Florida common stock outstanding, Old Florida shareholders received 0.34 of a share of the Company’s common stock, as well as a cash payment for any fractional share.

The Company acquired all of the outstanding common stock of the former Old Florida shareholders for total consideration of $253.2 million, which resulted in goodwill of $99.6 million, as shown in the table below. With this acquisition, IBERIABANK entered into the Orlando, Florida MSA through the addition of 14 bank offices and an experienced in-market team. The Company projects cost savings will be recognized in future periods through the elimination of redundant operations. The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	3,839,554	$	242,007
Total equity consideration		242,007
Non-Equity consideration
Cash		11,145
Total consideration paid		253,152
Fair value of net assets assumed including identifiable intangible assets		153,514
Goodwill		$	99,638

Acquisition of Georgia Commerce Bancshares, Inc.

On May 31, 2015, the Company acquired Georgia Commerce Bancshares, Inc. (“Georgia Commerce”), the holding company of Georgia Commerce Bank. Under the terms of the agreement, Georgia Commerce shareholders received 0.6134 of a share of the Company's common stock for each of the Georgia Commerce common stock shares outstanding, as well as a cash payment for any fractional share. All unexercised Georgia Commerce stock options on the closing date were settled for cash at fair value based on the closing price.

The Company acquired all of the outstanding common stock of the former Georgia Commerce shareholders for total consideration of $190.3 million, which resulted in goodwill of $87.3 million, as shown in the table below. With this acquisition, IBERIABANK entered into the Atlanta, Georgia MSA through the addition of nine bank offices and an experienced in-market team. The Company projects cost savings will be recognized in future periods through elimination of redundant operations. The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	2,882,357	$	185,249
Total equity consideration		185,249
Non-Equity consideration
Cash		5,015
Total consideration paid		190,264
Fair value of net assets assumed including identifiable intangible assets		102,945
Goodwill		$	87,319

The Company accounted for the aforementioned business combinations under the acquisition method in accordance with ASC Topic 805, Business Combinations. Accordingly, for each transaction the purchase price is allocated to the fair value of the assets acquired and liabilities assumed as of the date of acquisition. The following purchase price allocations on these acquisitions are preliminary and will be finalized upon the receipt of final valuations on certain assets and liabilities. In conjunction with the adoption of ASU 2015-16 as of September 30, 2015, upon receipt of final fair value estimates during the measurement period, which must be within one year of the acquisition dates, the Company will record any adjustments to the preliminary fair value estimates in the reporting period in which the adjustments are determined. Information regarding the Company's loan discounts and related deferred tax assets, core deposit intangible assets and related deferred tax liabilities, as well as income taxes payable and the related deferred tax balances, among other assets and liabilities recorded in the acquisitions, may be adjusted as the Company refines its estimates. Determining the fair value of assets and liabilities, particularly illiquid assets and liabilities, is a complicated process involving significant judgment. Fair value adjustments based on updated estimates could materially affect the goodwill recorded on the acquisitions. The Company may incur losses on the acquired loans that are materially different from losses the Company originally projected and included in the fair value estimates of loans.

The acquired assets and liabilities, as well as the preliminary adjustments to record those assets and liabilities at their estimated fair values, are presented in the following tables.

Florida Bank Group	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	72,982	$	—			$	72,982
Investment securities	107,236		136			(1)	107,372
Loans	312,902		(5,371		)	(2)	307,531
Other real estate owned	498		(75		)	(3)	423
Core deposit intangible	—		4,489			(4)	4,489
Deferred tax asset, net	19,889		8,569			(5)	28,458
Other assets	29,817		(8,949		)	(6)	20,868
Total Assets	$	543,324	$	(1,201	)		$	542,123
Liabilities
Interest-bearing deposits	$	282,417	$	263		(7)	$	282,680
Non-interest-bearing deposits	109,548		—				109,548
Borrowings	60,000		8,598			(8)	68,598
Other liabilities	1,898		4,618			(9)	6,516
Total Liabilities	$	453,863	$	13,479			$	467,342

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Florida Bank Group’s investments to their estimated fair values on the date of acquisition.

(2) The amount represents the adjustment of the book value of Florida Bank Group's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(3) The adjustment represents the adjustment of Florida Bank Group's OREO to its estimated fair value less costs to sell on the date of acquisition.

(4) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(5) The amount represents the net deferred tax asset recognized on the fair value adjustments of Florida Bank Group acquired assets and assumed liabilities.

(6) The amount represents the adjustment of the book value of Florida Bank Group’s property, equipment, and other assets to their estimated fair values at the acquisition date based on their appraised value.

(7) The amount represents the adjustment of the book value of Florida Bank Group's time deposits to their estimated fair values at the date of acquisition.

(8) The amount represents the adjustment of the book value of Florida Bank Group’s borrowings to their estimated fair value based on current interest rates and the credit characteristics inherent in the liability.

(9) The amount is necessary to record Florida Bank Group's rent liability at fair value.

Old Florida	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	360,688	$	—			$	360,688
Investment securities	67,209		—				67,209
Loans held for sale	5,952		—				5,952
Loans	1,073,773		(10,822		)	(1)	1,062,951
Other real estate owned	4,515		1,449			(2)	5,964
Core deposit intangible	—		6,821			(3)	6,821
Deferred tax asset, net	10,629		4,388			(4)	15,017
Other assets	30,549		(7,238		)	(5)	23,311
Total Assets	$	1,553,315	$	(5,402	)		$	1,547,913
Liabilities
Interest-bearing deposits	$	1,048,765	$	123		(6)	$	1,048,888
Non-interest-bearing deposits	340,869		—				340,869
Borrowings	1,528		—				1,528
Other liabilities	3,038		76			(7)	3,114
Total Liabilities	$	1,394,200	$	199			$	1,394,399

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Old Florida's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(2) The adjustment represents the adjustment of Old Florida's OREO to its estimated fair value less costs to sell on the date of acquisition.

(3) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(4) The amount represents the net deferred tax asset recognized on the fair value adjustments of Old Florida acquired assets and assumed liabilities.

(5) The amount represents the adjustment of the book value of Old Florida’s property, equipment, and other assets to their estimated fair values at the acquisition date based on their appraised value.

(6) The amount represents the adjustment of the book value of Old Florida's time deposits to their estimated fair values on the date of acquisition.

(7) The adjustment is necessary to record Old Florida's rent liability at fair value.

Georgia Commerce	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	51,059	$	—			$	51,059
Investment securities	135,710		(806		)	(1)	134,904
Loans held for sale	1,249		—				1,249
Loans	807,726		(15,606		)	(2)	792,120
Other real estate owned	9,795		(4,207		)	(3)	5,588
Core deposit intangible	—		6,720			(4)	6,720
Deferred tax asset, net	5,031		5,451			(5)	10,482
Other assets	28,952		(657		)	(6)	28,295
Total Assets	$	1,039,522	$	(9,105	)		$	1,030,417
Liabilities
Interest-bearing deposits	$	658,133	$	176		(7)	$	658,309
Non-interest-bearing deposits	249,739		—				249,739
Borrowings	13,203		—				13,203
Other liabilities	6,221		—				6,221
Total Liabilities	$	927,296	$	176			$	927,472

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Georgia Commerce’s investments to their estimated fair values on the date of acquisition.

(2) The amount represents the adjustment of the book value of Georgia Commerce's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(3) The adjustment represents the adjustment of Georgia Commerce's OREO to its estimated fair value less costs to sell on the date of acquisition.

(4) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(5) The amount represents the net deferred tax asset recognized on the fair value adjustments of Georgia Commerce acquired assets and assumed liabilities.

(6) The amount represents the adjustment of the book value of Georgia Commerce’s property, equipment, and other assets to their estimated fair value at the acquisition date based on their appraised value.

(7) The amount represents the adjustment of the book value of Georgia Commerce's time deposits to their estimated fair values at the date of acquisition.

Supplemental unaudited pro forma information

The following unaudited pro forma information for the years ended December 31, 2014 and 2013 reflect the Company’s estimated consolidated results of operations as if the acquisitions of Florida Bank Group, Old Florida, and Georgia Commerce occurred at January 1, 2014, unadjusted for potential cost savings and preliminary purchase price adjustments.

(Dollars in thousands, except per share data)	2014		2013
Interest and non-interest income	$	803,722	$	699,308
Net income	172,554		69,625
Earnings per share - basic	4.39		1.88
Earnings per share - diluted	4.38		1.88

The Company’s consolidated financial statements as of and for the year ended December 31, 2015 include the operating results of the acquired assets and assumed liabilities for the days subsequent to the respective acquisition dates. Due to the system conversions of the acquired entities throughout the current year and subsequent streamlining and integration of the operating activities into those of the Company, historical reporting for the former Florida Bank Group, Old Florida, and Georgia Commerce branches is impracticable and thus disclosure of the revenue from the assets acquired and income before income taxes is impracticable for the period subsequent to acquisition.

2014 Acquisitions

During 2014, the Company completed the acquisitions of Trust-One Memphis, Teche and First Private. The following table summarizes consideration paid, net assets acquired and goodwill recognized.

(Dollars in thousands)	Consideration Paid		Net Assets Acquired			Goodwill Recognized
Trust One Bank - Memphis Operations	$	—	$	(8,596	)	$	8,596
Teche Holding Company	156,740		76,311			80,429
First Private Holdings, Inc.	58,640		32,387			26,253

In addition, during 2014, the Company's subsidiary, LTC, acquired certain assets from The Title Company, LLC, a title office in Baton Rouge, Louisiana, and Louisiana Abstract and Title, LLC, a title office in Shreveport, Louisiana. These two acquisitions were immaterial and the assets recognized were primarily from goodwill and additional intangible assets.

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Investment Securities

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

INVESTMENT SECURITIES

The amortized cost and fair values of investment securities, with gross unrealized gains and losses, consist of the following:

	December 31, 2015
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	252,514	$	1,161	$	(1,592	)	$	252,083
Obligations of state and political subdivisions	182,541		5,429		(9		)	187,961
Mortgage-backed securities	2,272,879		8,457		(16,523		)	2,264,813
Other securities	95,496		430		(497		)	95,429
Total securities available for sale	$	2,803,430	$	15,477	$	(18,621	)	$	2,800,286
Securities held to maturity:
Obligations of state and political subdivisions	$	69,979	$	2,803	$	(101	)	$	72,681
Mortgage-backed securities	28,949		107		(776		)	28,280
Total securities held to maturity	$	98,928	$	2,910	$	(877	)	$	100,961

	December 31, 2014
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	317,386	$	1,700	$	(3,533	)	$	315,553
Obligations of state and political subdivisions	86,513		3,679		(2		)	90,190
Mortgage-backed securities	1,741,917		16,882		(7,184		)	1,751,615
Other securities	1,460		35		—			1,495
Total securities available for sale	$	2,147,276	$	22,296	$	(10,719	)	$	2,158,853
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	10,000	$	88	$	—		$	10,088
Obligations of state and political subdivisions	77,597		3,153		(145		)	80,605
Mortgage-backed securities	29,363		151		(726		)	28,788
Total securities held to maturity	$	116,960	$	3,392	$	(871	)	$	119,481

Securities with carrying values of $1.4 billion were pledged to secure public deposits and other borrowings at both December 31, 2015 and 2014.

Information pertaining to securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, is as follows:

	December 31, 2015
	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(1,214	)	$	177,839	$	(378	)	$	28,116	$	(1,592	)	$	205,955
Obligations of state and political subdivisions	(9		)	5,765		—			—		(9		)	5,765
Mortgage-backed securities	(11,737		)	1,279,914		(4,786		)	185,215		(16,523		)	1,465,129
Other securities	(488		)	51,975		(9		)	499		(497		)	52,474
Total securities available for sale	$	(13,448	)	$	1,515,493	$	(5,173	)	$	213,830	$	(18,621	)	$	1,729,323
Securities held to maturity:
Obligations of state and political subdivisions	$	(9	)	$	1,999	$	(92	)	$	4,162	$	(101	)	$	6,161
Mortgage-backed securities	(45		)	3,530		(731		)	17,573		(776		)	21,103
Total securities held to maturity	$	(54	)	$	5,529	$	(823	)	$	21,735	$	(877	)	$	27,264

	December 31, 2014
	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	—		$	—	$	(3,533	)	$	240,498	$	(3,533	)	$	240,498
Obligations of state and political subdivisions	(2		)	185		—			—		(2		)	185
Mortgage-backed securities	(1,189		)	304,686		(5,995		)	294,549		(7,184		)	599,235
Total securities available for sale	$	(1,191	)	$	304,871	$	(9,528	)	$	535,047	$	(10,719	)	$	839,918
Securities held to maturity:
Obligations of state and political subdivisions	$	(9	)	$	2,287	$	(136	)	$	8,590	$	(145	)	$	10,877
Mortgage-backed securities	—			—		(726		)	20,812		(726		)	20,812
Total securities held to maturity	$	(9	)	$	2,287	$	(862	)	$	29,402	$	(871	)	$	31,689

The Company assessed the nature of the unrealized losses in its portfolio as of December 31, 2015 and 2014 to determine if there are losses that should be deemed other-than-temporary. In its analysis of these securities, management considered numerous factors to determine whether there were instances where the amortized cost basis of the debt securities would not be fully recoverable, including, but not limited to:

• The length of time and extent to which the estimated fair value of the securities was less than their amortized cost,

• Whether adverse conditions were present in the operations, geographic area, or industry of the issuer,

• The payment structure of the security, including scheduled interest and principal payments, including the issuer’s failures to make scheduled payments, if any, and the likelihood of failure to make scheduled payments in the future,

• Changes to the rating of the security by a rating agency, and

• Subsequent recoveries or additional declines in fair value after the balance sheet date.

Management believes it has considered these factors, as well as all relevant information available, when determining the expected future cash flows of the securities in question. In each instance, management has determined the cost basis of the securities would be fully recoverable. Management also has the intent to hold debt securities until their maturity or anticipated recovery if the security is classified as available for sale. In addition, management does not believe the Company will be required to sell debt securities before the anticipated recovery of the amortized cost basis of the security. As a result of the Company's analysis, no declines in the estimated fair value of the Company's investment securities were deemed to be other-than-temporary at December 31, 2015 or 2014.

At December 31, 2015, 252 debt securities had unrealized losses of 1.10% of the securities’ amortized cost basis. At December 31, 2014, 112 debt securities had unrealized losses of 1.31% of the securities’ amortized cost basis. The unrealized losses for each of the securities related to market interest rate changes and not credit concerns of the issuers. Additional information on securities that have been in a continuous loss position for over twelve months at December 31 is presented in the following table.

(Dollars in thousands)	2015		2014
Number of securities
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	40		66
Issued by political subdivisions	2		5
Other	1		—
	43		71
Amortized Cost Basis
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	$	236,800	$	566,113
Issued by political subdivisions	4,253		8,727
Other	508		—
	$	241,561	$	574,840
Unrealized Loss
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	$	5,895	$	10,254
Issued by political subdivisions	92		136
Other	9		—
	$	5,996	$	10,390

The Fannie Mae, Freddie Mac, and Ginnie Mae securities are rated AA+ by S&P and Aaa by Moodys. Two of the securities in a continuous loss position for over twelve months were issued by political subdivisions. The securities issued by political subdivisions have S&P credit ratings ranging from AA to AAA and Moody's credit ratings ranging from Aa2 to Aaa.

The amortized cost and estimated fair value of investment securities by maturity at December 31, 2015 are presented in the following table. Securities are classified according to their contractual maturities without consideration of principal amortization, potential prepayments or call options. Accordingly, actual maturities may differ from contractual maturities. Weighted average yields are calculated on the basis of the yield to maturity based on the amortized cost of each security.

	Securities Available for Sale						Securities Held to Maturity
(Dollars in thousands)	Weighted Average Yield		Amortized Cost		Estimated Fair Value		Weighted Average Yield		Amortized Cost		Estimated Fair Value
Within one year or less	2.02	%	$	14,360	$	14,373	3.83	%	$	75	$	75
One through five years	1.72		318,423		318,718		3.06		13,627		13,989
After five through ten years	2.31		501,217		506,856		2.89		16,278		16,914
Over ten years	2.14		1,969,430		1,960,339		2.91		68,948		69,983
	2.12	%	$	2,803,430	$	2,800,286	2.93	%	$	98,928	$	100,961

The following is a summary of realized gains and losses from the sale of securities classified as available for sale. Gains or losses on securities sold are recorded on the trade date, using the specific identification method.

	Year Ended December 31
(Dollars in thousands)	2015			2014			2013
Realized gains	$	1,834		$	863		$	2,387
Realized losses	(259		)	(92		)	(110		)
	$	1,575		$	771		$	2,277

In addition to the gains above, the Company realized certain immaterial gains on calls of securities held to maturity.

Other Equity Securities

The Company accounts for the following securities at amortized cost, which approximates fair value, in “other assets” on the consolidated balance sheets at December 31:

(Dollars in thousands)	2015		2014
Federal Home Loan Bank (FHLB) stock	$	16,265	$	38,476
Federal Reserve Bank (FRB) stock	48,584		34,348
Other investments	1,159		1,306
	$	66,008	$	74,130

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Loans

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Loans

LOANS

Loans consist of the following, segregated into legacy and acquired loans, for the periods indicated:

	December 31, 2015
(Dollars in thousands)	Legacy Loans		Acquired Loans		Total
Commercial loans:
Real estate	$	4,504,062	$	1,569,449	$	6,073,511
Commercial and industrial	2,952,102		492,476		3,444,578
Energy-related	677,177		3,589		680,766
	8,133,341		2,065,514		10,198,855
Residential mortgage loans:
Residential 1-4 family	610,986		501,296		1,112,282
Construction / Owner Occupied	83,037		—		83,037
	694,023		501,296		1,195,319
Consumer and other loans:
Home equity	1,575,643		490,524		2,066,167
Indirect automobile	246,214		84		246,298
Other	541,299		79,490		620,789
	2,363,156		570,098		2,933,254
Total	$	11,190,520	$	3,136,908	$	14,327,428

	December 31, 2014
(Dollars in thousands)	Legacy Loans		Acquired Loans		Total
Commercial loans:
Real estate	$	3,676,811	$	684,968	$	4,361,779
Commercial and industrial	2,452,521		119,174		2,571,695
Energy-related	872,866		7,742		880,608
	7,002,198		811,884		7,814,082
Residential mortgage loans:
Residential 1-4 family	495,638		552,603		1,048,241
Construction / Owner Occupied	32,056		—		32,056
	527,694		552,603		1,080,297
Consumer and other loans:
Home equity	1,290,976		310,129		1,601,105
Indirect automobile	396,766		392		397,158
Other	451,080		97,322		548,402
	2,138,822		407,843		2,546,665
Total	$	9,668,714	$	1,772,330	$	11,441,044

Since 2009, the Company has acquired certain assets and liabilities of six failed banks. Substantially all of the loans and foreclosed real estate that were acquired through these transactions were covered by loss share agreements between the FDIC and IBERIABANK, which afforded IBERIABANK loss protection. Covered loans, which are included in acquired loans in the tables above, were $229.2 million and $444.5 million at December 31, 2015 and 2014, respectively, of which $191.7 million and $220.5 million, respectively, were residential mortgage and home equity loans. Refer to Note 7 for additional information regarding the Company’s loss sharing agreements.

Net deferred loan origination fees were $18.7 million and $11.2 million at December 31, 2015 and 2014, respectively. In addition to loans issued in the normal course of business, the Company considers overdrafts on customer deposit accounts to be loans and reclassifies these overdrafts as loans in its consolidated balance sheets. At December 31, 2015 and 2014, overdrafts of $5.1 million and $5.6 million, respectively, have been reclassified to loans.

Loans with carrying values of $3.9 billion and $3.1 billion were pledged as collateral for borrowings at December 31, 2015 and 2014, respectively.

Aging Analysis

The following tables provide an analysis of the aging of loans as of December 31, 2015 and 2014. Due to the difference in accounting for acquired loans, the tables below further segregate the Company’s loans between loans originated by the Company ("legacy loans") and acquired loans.

	December 31, 2015
	Legacy loans
	Past Due (1)								Current		Total Legacy Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	801	$	—	$	120	$	921	$	635,560	$	636,481	$	—
Commercial real estate - Other	2,687		793		15,517		18,997		3,848,584		3,867,581		95
Commercial and industrial	1,208		739		6,746		8,693		2,943,409		2,952,102		87
Energy-related	15		—		7,081		7,096		670,081		677,177		—
Residential mortgage	1,075		2,485		14,116		17,676		676,347		694,023		442
Consumer - Home equity	3,549		870		5,628		10,047		1,565,596		1,575,643		—
Consumer - Indirect automobile	2,187		518		1,181		3,886		242,328		246,214		—
Consumer - Credit card	394		113		394		901		76,360		77,261		—
Consumer - Other	1,923		752		769		3,444		460,594		464,038		—
Total	$	13,839	$	6,270	$	51,552	$	71,661	$	11,118,859	$	11,190,520	$	624
	December 31, 2014
	Legacy loans
	Past Due (1)								Current		Total Legacy Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	507	$	—	$	69	$	576	$	483,663	$	484,239	$	—
Commercial real estate - Other	11,799		148		6,859		18,806		3,173,766		3,192,572		—
Commercial and industrial	1,589		1,860		3,225		6,674		2,445,847		2,452,521		200
Energy-related	—		—		27		27		872,839		872,866		—
Residential mortgage	1,389		2,616		14,900		18,905		508,789		527,694		538
Consumer - Home equity	4,096		595		7,420		12,111		1,278,865		1,290,976		16
Consumer - Indirect automobile	2,447		396		1,419		4,262		392,504		396,766		—
Consumer - Credit card	253		163		1,032		1,448		71,297		72,745		—
Consumer - Other	1,285		424		773		2,482		375,853		378,335		—
Total	$	23,365	$	6,202	$	35,724	$	65,291	$	9,603,423	$	9,668,714	$	754

(1) Past due loans greater than 90 days include all loans on non-accrual status, regardless of past due status, as of the period indicated. Non-accrual loans are presented separately in the “Non-accrual Loans” section below.

	December 31, 2015
	Acquired loans
	Past Due (1)								Current		Discount/ Premium			Total Acquired Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	216	$	117	$	6,994	$	7,327	$	120,467	$	(2,368	)	$	125,426	$	6,994
Commercial real estate - Other	4,295		2,024		53,558		59,877		1,434,966		(50,820		)	1,444,023		52,067
Commercial and industrial	1,016		1,276		6,829		9,121		490,255		(6,900		)	492,476		5,674
Energy-related	—		—		1,368		1,368		2,221		—			3,589		1,198
Residential mortgage	73		1,806		22,873		24,752		506,103		(29,559		)	501,296		21,765
Consumer - Home equity	2,859		997		12,525		16,381		503,635		(29,492		)	490,524		11,234
Consumer - Indirect automobile	—		—		12		12		72		—			84		12
Consumer - Credit Card	—		—		17		17		565		—			582		17
Consumer - Other	580		211		667		1,458		79,167		(1,717		)	78,908		461
Total	$	9,039	$	6,431	$	104,843	$	120,313	$	3,137,451	$	(120,856	)	$	3,136,908	$	99,422
	December 31, 2014
	Acquired loans
	Past Due (1)								Current		Discount/ Premium			Total Acquired Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	2,740	$	57	$	8,225	$	11,022	$	64,393	$	(4,482	)	$	70,933	$	8,225
Commercial real estate - Other	4,986		3,330		67,302		75,618		588,947		(50,530		)	614,035		67,198
Commercial and industrial	2,118		70		4,528		6,716		119,472		(7,014		)	119,174		4,528
Energy-related	—		—		11		11		7,731		—			7,742		11
Residential mortgage	324		2,788		30,804		33,916		559,180		(40,493		)	552,603		29,553
Consumer - Home equity	3,165		385		22,800		26,350		315,788		(32,009		)	310,129		22,409
Consumer - Indirect automobile	13		17		9		39		393		(40		)	392		9
Consumer - Credit Card	10		—		24		34		614		—			648		24
Consumer - Other	1,458		113		1,967		3,538		94,652		(1,516		)	96,674		1,847
Total	$	14,814	$	6,760	$	135,670	$	157,244	$	1,751,170	$	(136,084	)	$	1,772,330	$	133,804

(1) Past due information presents acquired loans at the gross loan balance, prior to application of discounts.

Non-accrual Loans

The following table provides the unpaid principal balance of legacy loans on non-accrual status at December 31, 2015 and 2014.

(Dollars in thousands)	2015		2014
Commercial real estate - Construction	$	120	$	69
Commercial real estate - Other	15,422		6,859
Commercial and industrial	6,659		3,025
Energy-related	7,081		27
Residential mortgage	13,674		14,362
Consumer - Home equity	5,628		7,404
Consumer - Indirect automobile	1,181		1,419
Consumer - Credit card	394		1,032
Consumer - Other	769		773
Total	$	50,928	$	34,970

The amount of interest income that would have been recorded in 2015, 2014 and 2013 if total non-accrual loans had been current in accordance with their contractual terms was approximately $2.1 million, $1.8 million and $2.9 million, respectively.

Loans Acquired

As discussed in Note 3, during 2015, the Company acquired loans with fair values of $0.3 billion from Florida Bank Group, $1.1 billion from Old Florida, and $0.8 billion from Georgia Commerce. Of the total $2.2 billion of loans acquired during 2015, $2.1 billion were determined to have no evidence of deteriorated credit quality and are accounted for under ASC Topics 310-10 and 310-20. The remaining $57.8 million were determined to exhibit deteriorated credit quality since origination under ASC 310-30. The tables below show the balances acquired during 2015 for these two subsections of the acquired portfolio as of the acquisition date. These amounts are subject to change due to the finalization of purchase accounting adjustments.

(Dollars in thousands)
Contractually required principal and interest at acquisition	$	2,384,114
Expected losses and foregone interest	(15,539		)
Cash flows expected to be collected at acquisition	2,368,575
Fair value of acquired loans at acquisition	$	2,105,466

(Dollars in thousands)	Acquired Impaired Loans
Contractually required principal and interest at acquisition	$	76,445
Non-accretable difference (expected losses and foregone interest)	(11,867		)
Cash flows expected to be collected at acquisition	64,578
Accretable yield	(6,823		)
Basis in acquired loans at acquisition	$	57,755

The following is a summary of changes in the accretable difference for loans accounted for under ASC 310-30 during the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Balance at beginning of period	$	287,651		$	354,892		$	356,393
Additions	6,823			13,848			—
Transfers from non-accretable difference to accretable yield	9,916			25,844			50,743
Accretion	(80,479		)	(103,233		)	(179,456		)
Changes in expected cash flows not affecting non-accretable differences (1)	3,591			(3,700		)	127,212
Balance at end of period	$	227,502		$	287,651		$	354,892

(1) Includes changes in cash flows expected to be collected due to the impact of changes in actual or expected timing of liquidation events, modifications, changes in interest rates and changes in prepayment assumptions.

Troubled Debt Restructurings

Information about the Company’s troubled debt restructurings ("TDRs") at December 31, 2015 and 2014 is presented in the following tables. Modifications of loans that are accounted for within a pool under ASC Topic 310-30, which include covered loans, as well as certain other acquired loans are excluded as TDRs. Accordingly, such modifications do not result in the removal of those loans from the pool, even if the modification of those loans would otherwise be considered a TDR. As a result, all covered and certain acquired loans that would otherwise meet the criteria for classification as a TDR are excluded from the tables below.

TDRs totaling $57.0 million occurred during the current year. There were no material TDRs that occurred during 2014. The following table provides information on how the TDRs were modified during the year ended December 31:

(Dollars in thousands)	2015
Extended maturities	$	15,594
Interest rate adjustment	—
Maturity and interest rate adjustment	23,374
Movement to or extension of interest-rate only payments	241
Forbearance	122
Other concession(s) (1)	17,710
Total	$	57,041

(1) Other concessions may include covenant waivers, forgiveness of principal or interest associated with a customer bankruptcy, or a combination of any of the above concessions.

Of the $57.0 million TDRs occurring during the twelve months ended December 31, 2015, $34.5 million are on accrual status and $22.5 million are on non-accrual status.

The following table presents the end of period balance for loans modified in a TDR during the year ended December 31, 2015. The Company had no material TDRs that were added during the year ended December 31, 2014.

	December 31, 2015
(In thousands, except number of loans)	Number of Loans	Pre-modification Outstanding Recorded Investment		Post-modification Outstanding Recorded Investment (1)
Commercial real estate	11	$	26,764	$	25,250
Commercial and industrial	26	21,233		18,114
Energy-related	2	9,797		9,484
Residential mortgage	1	70		68
Consumer - Home equity	50	4,440		3,865
Consumer - Indirect	6	79		79
Consumer - Other	17	248		181
Total	113	$	62,631	$	57,041

(1) Recorded investment includes any allowance for credit losses recorded on the TDRs at December 31, 2015.

Information detailing TDRs that defaulted during the years ended December 31, 2015 and 2014 and were modified in the previous twelve months (i.e., the twelve months prior to the default) is presented in the following table. The Company has defined a default as any loan with a loan payment that is currently past due greater than 30 days, or was past due greater than 30 days at any point during the previous twelve months, or since the date of modification, whichever is shorter.

	December 31, 2015			December 31, 2014
(In thousands, except number of loans)	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
Commercial real estate	6	$	22,075	30	$	—
Commercial and industrial	20	8,970		9	1,600
Energy-related	1	3,120		—	—
Residential mortgage	—	—		—	—
Consumer - Home Equity	20	1,547		—	—
Consumer - Indirect automobile	6	79		—	—
Consumer - Other	9	2		1	—
Total	62	$	35,793	40	$	1,600

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Allowance for Credit Losses and Credit Quality

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Allowance for Credit Losses and Credit Quality

ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY

Allowance for Credit Losses Activity

A summary of changes in the allowance for credit losses for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	76,174		$	53,957		$	130,131
Provision for loan losses before adjustment attributable to FDIC loss share agreements	27,711			1,837			29,548
Adjustment attributable to FDIC loss share arrangements	—			1,360			1,360
Net provision for loan losses	27,711			3,197			30,908
Adjustment attributable to FDIC loss share arrangements	—			(1,360		)	(1,360		)
Transfer of balance to OREO	—			(1,221		)	(1,221		)
Loans charged-off	(15,778		)	(10,737		)	(26,515		)
Recoveries	5,701			734			6,435
Allowance for loan losses at end of period	$	93,808		$	44,570		$	138,378
Reserve for unfunded commitments at beginning of period	$	11,801		$	—		$	11,801
Provision for unfunded lending commitments	2,344			—			2,344
Reserve for unfunded commitments at end of period	$	14,145		$	—		$	14,145
Allowance for credit losses at end of period	$	107,953		$	44,570		$	152,523

	2014
	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	67,342		$	75,732		$	143,074
Provision for loan losses before adjustment attributable to FDIC loss share agreements	14,274			526			14,800
Adjustment attributable to FDIC loss share arrangements	—			4,260			4,260
Net provision for loan losses	14,274			4,786			19,060
Adjustment attributable to FDIC loss share arrangements	—			(4,260		)	(4,260		)
Transfer of balance to OREO	—			(7,323		)	(7,323		)
Loans charged-off	(11,312		)	(15,543		)	(26,855		)
Recoveries	5,870			565			6,435
Allowance for loan losses at end of period	$	76,174		$	53,957		$	130,131
Reserve for unfunded commitments at beginning of period	$	11,147		$	—		$	11,147
Provision for unfunded lending commitments	654			—			654
Reserve for unfunded commitments at end of period	$	11,801		$	—		$	11,801
Allowance for credit losses at end of period	$	87,975		$	53,957		$	141,932

	2013
	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	74,211		$	177,392		$	251,603
Provision for (Reversal of) loan losses before adjustment attributable to FDIC loss share agreements	6,828			(57,768		)	(50,940		)
Adjustment attributable to FDIC loss share arrangements	—			56,085			56,085
Net provision for (reversal of) loan losses	6,828			(1,683		)	5,145
Adjustment attributable to FDIC loss share arrangements	—			(56,085		)	(56,085		)
Transfer of balance to OREO	—			(28,126		)	(28,126		)
Transfer of balance to the RULC	(9,828		)	—			(9,828		)
Loans charged-off	(10,686		)	(15,795		)	(26,481		)
Recoveries	6,817			29			6,846
Allowance for loan losses at end of period	$	67,342		$	75,732		$	143,074
Reserve for unfunded commitments at beginning of period	$	—		$	—		$	—
Transfer of balance from the allowance for loan losses	9,828			—			9,828
Provision for unfunded lending commitments	1,319			—			1,319
Reserve for unfunded commitments at end of period	$	11,147		$	—		$	11,147
Allowance for credit losses at end of period	$	78,489		$	75,732		$	154,221

A summary of changes in the allowance for credit losses for legacy loans, by loan portfolio type, for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	26,752		$	24,455		$	5,949		$	2,678		$	16,340		$	76,174
(Reversal of) Provision for loan losses	(1,466		)	(103		)	17,917			1,493			9,870			27,711
Loans charged off	(2,525		)	(1,276		)	(3		)	(291		)	(11,683		)	(15,778		)
Recoveries	1,897			207			—			67			3,530			5,701
Allowance for loan losses at end of period	$	24,658		$	23,283		$	23,863		$	3,947		$	18,057		$	93,808
Reserve for unfunded commitments at beginning of period	$	3,370		$	3,733		$	1,596		$	168		$	2,934		$	11,801
Provision for (Reversal of) unfunded commitments	790			(285		)	1,069			662			108			2,344
Reserve for unfunded commitments at end of period	$	4,160		$	3,448		$	2,665		$	830		$	3,042		$	14,145
Allowance on loans individually evaluated for impairment	$	1,246		$	272		$	2,122		$	1		$	352		$	3,993
Allowance on loans collectively evaluated for impairment	23,412			23,011			21,741			3,946			17,705			89,815
Loans, net of unearned income:
Balance at end of period	$	4,504,062		$	2,952,102		$	677,177		$	694,023		$	2,363,156		$	11,190,520
Balance at end of period individually evaluated for impairment	28,857			20,086			13,020			70			4,608			66,641
Balance at end of period collectively evaluated for impairment	4,475,205			2,932,016			$	664,157		693,953			2,358,548			11,123,879

	2014
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	22,872		$	20,839		$	6,878		$	2,546		$	14,207		$	67,342
Provision for (Reversal of) loan losses	2,171			4,971			(929		)	566			7,495			14,274
Loans charged off	(1,164		)	(1,400		)	—			(578		)	(8,170		)	(11,312		)
Recoveries	2,873			45			—			144			2,808			5,870
Allowance for loan losses at end of period	$	26,752		$	24,455		$	5,949		$	2,678		$	16,340		$	76,174
Reserve for unfunded commitments at beginning of period	$	3,071		$	1,814		$	3,043		$	72		$	3,147		$	11,147
Provision for (Reversal of) unfunded commitments	299			1,919			(1,447		)	96			(213		)	654
Reserve for unfunded commitments at end of period	$	3,370		$	3,733		$	1,596		$	168		$	2,934		$	11,801
Allowance on loans individually evaluated for impairment	$	20		$	407		$	—		$	—		$	3		$	430
Allowance on loans collectively evaluated for impairment	26,732			24,048			5,949			2,678			16,337			75,744
Loans, net of unearned income:
Balance at end of period	$	3,676,811		$	2,452,521		$	872,866		$	527,694		$	2,138,822		$	9,668,714
Balance at end of period individually evaluated for impairment	7,013			3,988			—			—			699			11,700
Balance at end of period collectively evaluated for impairment	3,669,798			2,448,533			872,866			527,694			2,138,123			9,657,014

	2013
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	31,298		$	20,605		$	6,812	$	1,583		$	13,913		$	74,211
(Reversal of) Provision for loan losses	(5,919		)	3,870			66		758			8,053			6,828
Transfer of balance to the RULC	(2,939		)	(3,497		)	—		(40		)	(3,352		)	(9,828		)
Loans charged off	(2,908		)	(516		)	—		(519		)	(6,743		)	(10,686		)
Recoveries	3,340			377			—		764			2,336			6,817
Allowance for loan losses at end of period	$	22,872		$	20,839		$	6,878	$	2,546		$	14,207		$	67,342
Reserve for unfunded commitments at beginning of period	$	—		$	—		$	—	$	—		$	—		$	—
Transfer of balance from the allowance for loan losses	2,939			3,497			—		40			3,352			9,828
Provision for unfunded lending commitments	132			(1,683		)	3,043		32			(205		)	1,319
Reserve for unfunded commitments at end of period	$	3,071		$	1,814		$	3,043	$	72		$	3,147		$	11,147
Allowance on loans individually evaluated for impairment	$	8		$	841		$	—	$	180		$	—		$	1,029
Allowance on loans collectively evaluated for impairment	22,864			19,998			6,878		2,366			14,207			66,313
Loans, net of unearned income:
Balance at end of period	$	3,054,100		$	2,234,173		$	752,682	$	414,372		$	1,832,994		$	8,288,321
Balance at end of period individually evaluated for impairment	8,705			15,812			—		1,407			258			26,182
Balance at end of period collectively evaluated for impairment	3,045,395			2,218,361			752,682		412,965			1,832,736			8,262,139

A summary of changes in the allowance for loan losses for acquired loans, by loan portfolio type, for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	29,949		$	3,265		$	51	$	6,484		$	14,208		$	53,957
Provision for (Reversal of) loan losses	2,182			(122		)	74		2,126			(1,063		)	3,197
Increase (Decrease) in FDIC loss share receivable	757			(49		)	—		(235		)	(1,833		)	(1,360		)
Transfer of balance to OREO	174			(170		)	—		(541		)	(684		)	(1,221		)
Loans charged off	(7,810		)	(105		)	—		—			(2,822		)	(10,737		)
Recoveries	727			—			—		7			—			734
Allowance for loan losses at end of period	$	25,979		$	2,819		$	125	$	7,841		$	7,806		$	44,570
Allowance on loans individually evaluated for impairment	$	—		$	41		$	—	$	—		$	45		$	86
Allowance on loans collectively evaluated for impairment	25,979			2,778			125		7,841			7,761			44,484
Loans, net of unearned income:
Balance at end of period	$	1,569,449		$	492,476		$	3,589	$	501,296		$	570,098		$	3,136,908
Balance at end of period individually evaluated for impairment	720			164			—		—			458			1,342
Balance at end of period collectively evaluated for impairment	1,149,315			450,652			3,589		360,252			447,048			2,410,856
Balance at end of period acquired with deteriorated credit quality	419,414			41,660			—		141,044			122,592			724,710

	2014
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	42,026		$	6,641		$	—	$	10,889		$	16,176		$	75,732
Provision for loan losses	665			536			51		1,296			2,238			4,786
Increase (Decrease) in FDIC loss share receivable	227			509			—		(3,854		)	(1,142		)	(4,260		)
Transfer of balance to OREO	(1,897		)	(2,030		)	—		(1,719		)	(1,677		)	(7,323		)
Loans charged off	(11,201		)	(2,451		)	—		(232		)	(1,659		)	(15,543		)
Recoveries	129			60			—		104			272			565
Allowance for loan losses at end of period	$	29,949		$	3,265		$	51	$	6,484		$	14,208		$	53,957
Allowance on loans individually evaluated for impairment	$	—		$	—		$	—	$	—		$	—		$	—
Allowance on loans collectively evaluated for impairment	29,949			3,265			51		6,484			14,208			53,957
Loans, net of unearned income:
Balance at end of period	$	684,968		$	119,174		$	7,742	$	552,603		$	407,843		$	1,772,330
Balance at end of period individually evaluated for impairment	—			—			—		—			—			—
Balance at end of period collectively evaluated for impairment	169,338			60,584			7,742		402,347			265,168			905,179
Balance at end of period acquired with deteriorated credit quality	515,630			58,590			—		150,256			142,675			867,151

	2013
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	107,269		$	13,246		$	23,108		$	33,769		$	177,392
(Reversal of) Provision for loan losses	(1,286		)	(1,146		)	390			359			(1,683		)
(Decrease) Increase in FDIC loss share receivable	(28,238		)	(5,032		)	(4,896		)	(17,919		)	(56,085		)
Transfer of balance to OREO	(19,953		)	(427		)	(7,713		)	(33		)	(28,126		)
Loans charged off	(15,795		)	—			—			—			(15,795		)
Recoveries	29			—			—			—			29
Allowance for loan losses at end of period	$	42,026		$	6,641		$	10,889		$	16,176		$	75,732
Allowance on loans individually evaluated for impairment	$	—		$	—		$	—		$	—		$	—
Allowance on loans collectively evaluated for impairment	42,026			6,641			10,889			16,176			75,732
Loans, net of unearned income:
Balance at end of period	$	732,401		$	90,062		$	172,160		$	209,075		$	1,203,698
Balance at end of period individually evaluated for impairment	—			—			—			—			—
Balance at end of period collectively evaluated for impairment	393,487			37,430			162,248			157,744			750,909
Balance at end of period acquired with deteriorated credit quality	338,914			52,632			9,912			51,331			452,789

Portfolio Segment Risk Factors

Commercial real estate loans include loans to commercial customers for long-term financing of land and buildings or for land development or construction of a building. These loans are repaid through revenues from operations of the businesses, rents of properties, sales of properties and refinances. Commercial and industrial loans represent loans to commercial customers to finance general working capital needs, equipment purchases and other projects where repayment is derived from cash flows resulting from business operations. The Company originates commercial business loans on a secured and, to a lesser extent, unsecured basis.

Residential mortgage loans consist of loans to consumers to finance a primary residence. The vast majority of the residential mortgage loan portfolio is comprised of 1-4 family mortgage loans secured by properties located in the Company's market areas and originated under terms and documentation that permit their sale in the secondary market.

Consumer loans are offered by the Company in order to provide a full range of retail financial services to its customers and include home equity, indirect automobile, credit card and other direct consumer installment loans. The Company originates substantially all of its consumer loans in its primary market areas. Loans in the consumer segment are sensitive to unemployment and other key consumer economic measures.

Credit Quality

The Company utilizes an asset risk classification system in accordance with guidelines established by the Federal Reserve Board as part of its efforts to monitor commercial asset quality. “Special mention” loans are defined as loans where known information about possible credit problems of the borrower cause management to have some doubt as to the ability of these borrowers to comply with the present loan repayment terms and which may result in future disclosure of these loans as non-performing. For assets with identified credit issues, the Company has two primary classifications for problem assets: “substandard” and “doubtful.”

Substandard assets have one or more defined weaknesses and are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Doubtful assets have the weaknesses of substandard assets with the additional characteristic that the weaknesses make collection or liquidation in full satisfaction of the loan balance outstanding questionable, which makes probability of loss based on currently existing facts, conditions, and values higher. Loans classified as “Pass” do not meet the criteria set forth for special mention, substandard, or doubtful classification and are not considered criticized. Asset risk classifications are determined at origination or acquisition and reviewed on an ongoing basis. Risk classifications are changed if, in the opinion of management, the risk profile of the customer has changed since the last review of the loan relationship.

The Company’s investment in loans by credit quality indicator is presented in the following tables. The tables below further segregate the Company’s loans between loans that were originated by the Company (legacy loans) and acquired loans. Loan premiums/discounts in the tables below represent the adjustment of non-covered acquired loans to fair value at the acquisition date, as adjusted for income accretion and changes in cash flow estimates in subsequent periods. Asset risk classifications for commercial loans reflect the classification as of December 31, 2015 and 2014, respectively. Credit quality information in the tables below includes loans acquired at the gross loan balance, prior to the application of premiums/discounts, at December 31, 2015 and 2014.

Loan delinquency is the primary credit quality indicator that the Company utilizes to monitor consumer asset quality.

	Legacy loans
	December 31, 2015										December 31, 2014
(Dollars in thousands)	Pass		Special Mention		Sub- standard		Doubtful		Total		Pass		Special Mention		Sub- standard		Doubtful		Total
Commercial real estate - Construction	$	634,889	$	160	$	1,432	$	—	$	636,481	$	483,930	$	240	$	69	$	—	$	484,239
Commercial real estate - Other	3,806,528		21,877		37,001		2,175		3,867,581		3,120,370		49,847		22,193		162		3,192,572
Commercial and industrial	2,911,396		14,826		19,888		5,992		2,952,102		2,414,293		7,330		28,965		1,933		2,452,521
Energy-related	531,657		67,937		74,272		3,311		677,177		872,842		—		24		—		872,866
Total	$	7,884,470	$	104,800	$	132,593	$	11,478	$	8,133,341	$	6,891,435	$	57,417	$	51,251	$	2,095	$	7,002,198

	Legacy loans
	December 31, 2015						December 31, 2014
(Dollars in thousands)	Current		30+ Days Past Due		Total		Current		30+ Days Past Due		Total
Residential mortgage	$	676,347	$	17,676	$	694,023	$	508,789	$	18,905	$	527,694
Consumer - Home equity	1,565,596		10,047		1,575,643		1,278,865		12,111		1,290,976
Consumer - Indirect automobile	242,328		3,886		246,214		392,504		4,262		396,766
Consumer - Credit card	76,360		901		77,261		71,297		1,448		72,745
Consumer - Other	460,594		3,444		464,038		375,853		2,482		378,335
Total	$	3,021,225	$	35,954	$	3,057,179	$	2,627,308	$	39,208	$	2,666,516

	Acquired loans
	December 31, 2015															December 31, 2014
(Dollars in thousands)	Pass		Special Mention		Sub-standard		Doubtful		Loss		Discount			Total		Pass		Special Mention		Sub-standard		Doubtful		Discount			Total
Commercial real estate - Construction	$	116,539	$	1,681	$	8,803	$	771	$	—	$	(2,368	)	$	125,426	$	58,849	$	3,934	$	12,632	$	—	$	(4,482	)	$	70,933
Commercial real estate - Other	1,383,409		26,080		79,119		6,124		111		(50,820		)	1,444,023		530,958		33,216		100,391		—		(50,530		)	614,035
Commercial and industrial	473,241		8,376		16,510		1,206		43		(6,900		)	492,476		109,593		2,256		14,082		257		(7,014		)	119,174
Energy-related	2,166		55		170		1,198		—		—			3,589		7,731		—		11		—		—			7,742
Total	$	1,975,355	$	36,192	$	104,602	$	9,299	$	154	$	(60,088	)	$	2,065,514	$	707,131	$	39,406	$	127,116	$	257	$	(62,026	)	$	811,884

	Acquired loans
	December 31, 2015									December 31, 2014
(Dollars in thousands)	Current		30+ Days Past Due		Premium (discount)			Total		Current		30+ Days Past Due		Premium (discount)			Total
Residential mortgage	$	506,103	$	24,752	$	(29,559	)	$	501,296	$	559,180	$	33,916	$	(40,493	)	$	552,603
Consumer - Home equity	503,635		16,381		(29,492		)	490,524		315,788		26,350		(32,009		)	310,129
Consumer - Indirect automobile	72		12		—			84		393		39		(40		)	392
Consumer - Other	79,732		1,475		(1,717		)	79,490		95,266		3,572		(1,516		)	97,322
Total	$	1,089,542	$	42,620	$	(60,768	)	$	1,071,394	$	970,627	$	63,877	$	(74,058	)	$	960,446

Legacy Impaired Loans

Information on the Company’s investment in legacy impaired loans, which include all TDRs and all other non-accrual loans, is presented in the following tables as of and for the periods indicated.  Legacy non-accrual mortgage and consumer loans, and commercial loans below the Company’s specific threshold, are included for purposes of this disclosure although such loans are not evaluated or measured individually for impairment for purposes of determining the allowance for loan losses.

	December 31, 2015
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	16,145	$	16,145	$	—		$	15,864	$	315
Commercial and industrial	14,340		14,340		—			18,839		1,148
Energy-related	—		—		—			—		—
Consumer - Home equity	730		730		—			533		22
Consumer - Other	66		66		—			66		5
With an allowance recorded:
Commercial real estate	12,500		13,753		(1,253		)	14,055		554
Commercial and industrial	5,985		6,262		(277		)	7,352		331
Energy-related	11,319		13,444		(2,125		)	14,339		471
Residential mortgage	13,679		13,743		(64		)	14,086		82
Consumer - Home equity	8,196		8,559		(363		)	7,554		129
Consumer - Indirect automobile	1,171		1,181		(10		)	1,613		44
Consumer - Credit card	386		394		(8		)	881		—
Consumer - Other	876		899		(23		)	1,039		44
Total	$	85,393	$	89,516	$	(4,123	)	$	96,221	$	3,145
Total commercial loans	$	60,289	$	63,944	$	(3,655	)	$	70,449	$	2,819
Total mortgage loans	13,679		13,743		(64		)	14,086		87
Total consumer loans	11,425		11,829		(404		)	11,686		244

	December 31, 2014
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	6,680	$	6,680	$	—		$	6,703	$	132
Commercial and industrial	2,483		2,483		—			2,873		57
Consumer - Home equity	682		682		—			696		19
With an allowance recorded:
Commercial real estate	1,044		1,069		(25		)	1,134		38
Commercial and industrial	1,209		1,617		(408		)	2,113		23
Energy-related	27		27		—			28		1
Residential mortgage	14,111		14,363		(252		)	14,263		110
Consumer - Home equity	7,121		7,165		(44		)	7,544		43
Consumer - Indirect automobile	1,410		1,419		(9		)	2,016		51
Consumer - Credit card	1,012		1,032		(20		)	797		—
Consumer - Other	781		790		(9		)	1,009		39
Total	$	36,560	$	37,327	$	(767	)	$	39,176	$	513
Total commercial loans	$	11,443	$	11,876	$	(433	)	$	12,851	$	251
Total mortgage loans	14,111		14,363		(252		)	14,263		110
Total consumer loans	11,006		11,088		(82		)	12,062		152

	December 31, 2013
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	8,567	$	8,567	$	—		$	10,443	$	43
Commercial and industrial	13,256		13,256		—			11,074		170
Consumer - Home equity	258		258		—			281		1
With an allowance recorded:
Commercial real estate	1,268		1,284		(16		)	4,414		8
Commercial and industrial	1,927		2,770		(843		)	2,892		100
Residential mortgage	11,408		11,645		(237		)	9,675		98
Consumer - Home equity	6,506		6,550		(44		)	7,593		93
Consumer - Indirect automobile	1,267		1,275		(8		)	2,090		55
Consumer - Credit card	404		411		(7		)	418		—
Consumer - Other	481		485		(4		)	765		19
Total	$	45,342	$	46,501	$	(1,159	)	$	49,645	$	587
Total commercial loans	$	25,018	$	25,877	$	(859	)	$	28,823	$	321
Total mortgage loans	11,408		11,645		(237		)	9,675		98
Total consumer loans	8,916		8,979		(63		)	11,147		168

As of December 31, 2015 and 2014, the Company was not committed to lend a material amount of additional funds to any customer whose loan was classified as impaired or as a troubled debt restructuring.

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Loss Sharing Agreements and FDIC Loss Share Receivable

12 Months Ended

Dec. 31, 2015

Loss Sharing Agreements and FDIC Loss Share Receivable [Abstract]

Loss Sharing Agreements and FDIC Loss Share Receivable

LOSS SHARING AGREEMENTS AND FDIC LOSS SHARE RECEIVABLE

Loss Sharing Agreements

Since 2009, the Company has acquired certain assets and liabilities of six failed banks. Substantially all of the loans and foreclosed real estate acquired through these transactions were covered by loss share agreements between the FDIC and IBERIABANK, which afforded IBERIABANK loss protection.

During the reimbursable loss periods, the FDIC will cover 80% of covered loan and foreclosed real estate losses up to certain thresholds for the six acquisitions, and 95% of losses that exceed contractual thresholds for three acquisitions. The reimbursable loss periods, excluding single family residential assets, ended in 2014 for three acquisitions, ended during 2015 for one acquisition and will end during 2016 for two acquisitions. The reimbursable loss periods for single family residential assets will end in 2019 for three acquisitions, in 2020 for one acquisition, and in 2021 for two acquisitions. To the extent that loss share coverage ends prior to triggering events on covered assets that would enable the Company to collect these amounts from the FDIC, future impairments may be required.

In addition, all covered assets, excluding single family residential assets, have a three year recovery period, which begins upon expiration of the reimbursable loss period. During the recovery periods, the Company must reimburse the FDIC for its share of any recovered losses, net of certain expenses, consistent with the covered loss reimbursement rates in effect during the recovery periods.

FDIC loss share receivables

The Company recorded indemnification assets in the form of FDIC loss share receivables as of the acquisition date of each of the six banks covered by loss share agreements. At acquisition, the indemnification assets represented the fair value of the expected cash flows to be received from the FDIC under the loss share agreements. Subsequent to acquisition, the FDIC loss share receivables are updated to reflect changes in actual and expected amounts collectible adjusted for amortization.

The following is a summary of FDIC loss share receivables year-to-date activity:

	December 31
(Dollars in thousands)	2015			2014
Balance at beginning of period	$	69,627		$	162,312
Change due to (reversal of) loan loss provision recorded on FDIC covered loans	(1,360		)	(4,260		)
Amortization	(23,500		)	(74,617		)
(Submission of reimbursable losses) recoveries payable to the FDIC	(2,444		)	3,282
Impairment	—			(5,121		)
Changes due to a change in cash flow assumptions on OREO and other changes	(2,445		)	(11,969		)
Balance at end of period	$	39,878		$	69,627

FDIC loss share receivables collectibility assessment

The Company assesses the FDIC loss share receivables for collectibility on a quarterly basis. Based on the collectibility analysis completed for the year ended December 31, 2015, the Company concluded that the $39.9 million FDIC loss share receivable is fully collectible as of December 31, 2015.

2014 and 2013 Impairments of FDIC loss share receivables

Based on improving economic trends, their impact on the amount and timing of expected future cash flows, and delays in the foreclosure process, during the loss share receivable collectibility assessment completed for the years ended December 31, 2014 and 2013, the Company concluded that certain expected losses were probable of not being collected from either the FDIC or the customer because such projected losses were no longer expected to occur or were expected to occur beyond the reimbursable loss periods specified within the loss share agreements. Management deemed an impairment charge necessary for the year ended December 31, 2014 in the amount of $5.1 million attributable to losses on OREO transactions that moved beyond the loss share term.

On April 10, 2013, management concluded that an impairment charge of $31.8 million was required and was recognized in the Company's consolidated financial statements during the three-month period ended March 31, 2013.

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Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity)

12 Months Ended

Dec. 31, 2015

Transfers and Servicing [Abstract]

Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity)

TRANSFERS AND SERVICING OF FINANCIAL ASSETS (INCLUDING MORTGAGE BANKING ACTIVITY)

Commercial Banking Activity

The unpaid principal balances of loans serviced for others were $888.4 million and $533.8 million at December 31, 2015 and 2014, respectively. Custodial escrow balances maintained in connection with the foregoing portfolio of loans serviced for others, and included in demand deposits, were immaterial at December 31, 2015 and 2014.

Mortgage Banking Activity

IBERIABANK through its subsidiary, IMC, originates mortgage loans for sale into the secondary market. The loans originated primarily consist of residential first mortgages that conform to standards established by the GSEs, but can also consist of junior lien loans secured by residential property. These sales are primarily to private companies that are unaffiliated with the GSEs on a servicing-released basis. Changes to the carrying amount of mortgage loans held for sale at December 31 are presented in the following table.

(Dollars in thousands)	2015			2014			2013
Balance at beginning of period	$	140,072		$	128,442		$	267,475
Originations and purchases	2,464,588			1,675,538			2,116,460
Sales, net of gains	(2,432,979		)	(1,657,409		)	(2,255,493		)
Other	(5,434		)	(6,499		)	—
Balance at end of period	$	166,247		$	140,072		$	128,442

The following table details the components of mortgage income for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Fair value changes of derivatives and mortgage loans held for sale:
Mortgage loans held for sale and derivatives	$	2,216		$	631		$	(4,822	)
Derivative settlements, net	(5,017		)	(8,743		)	3,100
Gains on sales	83,131			59,156			65,393
Servicing and other income, net	792			753			526
	$	81,122		$	51,797		$	64,197

Mortgage Servicing Rights

Mortgage servicing rights are recorded at the lower of cost or market value in “other assets” on the Company's consolidated balance sheets and amortized over the remaining servicing life of the loans, with consideration given to prepayment assumptions. Mortgage servicing rights had the following carrying values as of the periods indicated:

	December 31, 2015							December 31, 2014
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
(Dollars in thousands)
Mortgage servicing rights	$	6,104	$	(2,320	)	$	3,784	$	4,751	$	(1,253	)	$	3,498

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Premises and Equipment

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Premises and Equipment

PREMISES AND EQUIPMENT

Premises and equipment consisted of the following at December 31:

(Dollars in thousands)	2015			2014
Land	$	84,438		$	75,916
Buildings	245,934			232,727
Furniture, fixtures and equipment	140,031			128,388
Total premises and equipment	470,403			437,031
Accumulated depreciation	(146,501		)	(129,872		)
Total premises and equipment, net	$	323,902		$	307,159

Depreciation expense was $22.2 million, $19.4 million, and $19.6 million, for the years ended December 31, 2015, 2014, and 2013, respectively.

The Company actively engages in leasing office space available in buildings it owns. Leases have different terms ranging from monthly rental to six years. For the year ended December 31, 2015, income from these leases averaged $0.2 million per month. Total lease income for the years ended December 31, 2015, 2014, and 2013 was $2.4 million, $1.6 million, and $1.5 million, respectively. Income from leases is reported as a reduction in occupancy and equipment expense. The total allocated cost of the portion of the buildings held for lease at December 31, 2015 and 2014 was $8.2 million and $7.6 million, respectively, with related accumulated depreciation of $2.6 million and $2.4 million, respectively.

The Company leases certain branch and corporate offices, land and ATM facilities through non-cancelable operating leases with terms that range from one to 50 years, some of which contain renewal options and escalation clauses under various terms.Rent expense for the years ended December 31, 2015, 2014, and 2013 totaled $15.4 million, $10.9 million, and $11.4 million, respectively.

Minimum future annual rent commitments under lease agreements for the periods indicated are as follows:

(Dollars in thousands)
2016	$	16,957
2017	14,751
2018	13,491
2019	11,952
2020	10,735
2021 and thereafter	41,054
	$	108,940

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Goodwill and Other Acquired Intangible Assets

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Acquired Intangible Assets

GOODWILL AND OTHER ACQUIRED INTANGIBLE ASSETS

Goodwill

Changes to the carrying amount of goodwill by reportable segment for the years ended December 31, 2015 and 2014 are provided in the following table.

(Dollars in thousands)	IBERIABANK		IMC		LTC		Total
Balance, December 31, 2013	$	373,905	$	23,178	$	4,789	$	401,872
Goodwill acquired during the year	115,278		—		376		115,654
Balance, December 31, 2014	$	489,183	$	23,178	$	5,165	$	517,526
Goodwill acquired during the year	207,077		—		—		207,077
Balance, December 31, 2015	$	696,260	$	23,178	$	5,165	$	724,603

The goodwill acquired in 2015 was a result of the Florida Bank, Old Florida, and Georgia Commerce acquisitions. The goodwill acquired in 2014 was a result of the Trust One-Memphis, Teche, First Private, The Title Company, LLC and Louisiana Abstract and Title, LLC acquisitions. See Note 3 for further information.

The Company performed the required annual goodwill impairment test as of October 1, 2015. The Company’s annual impairment test did not indicate impairment in any of the Company’s reporting units as of the testing date. Subsequent to the testing date, management has evaluated the events and changes that could indicate that goodwill might be impaired and concluded that a subsequent test is not required.

Title Plant

The Company held title plant assets recorded in “other assets” on the consolidated balance sheets totaling $6.7 million at both December 31, 2015 and 2014. No events or changes in circumstances occurred during 2015 or 2014 to suggest the carrying value of the title plant was not recoverable.

Intangible assets subject to amortization

Definite-lived intangible assets had the following carrying values included in “other assets” on the Company’s consolidated balance sheets as of December 31:

	2015							2014
(Dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Core deposit intangibles	$	74,001	$	(43,957	)	$	30,044	$	55,949	$	(36,354	)	$	19,595
Customer relationship intangible asset	1,348		(984		)	364		1,348		(822		)	526
Non-compete agreement	100		(79		)	21		163		(82		)	81
Other intangible assets	205		(114		)	91		205		(46		)	159
Total	$	75,654	$	(45,134	)	$	30,520	$	57,665	$	(37,304	)	$	20,361

The related amortization expense of intangible assets is as follows:

(Dollars in thousands)	Amount
Aggregate amortization expense for the years ended December 31:
2013	$	4,720
2014	5,807
2015	7,811

(Dollars in thousands)
Estimated amortization expense for the years ended December 31:
2016	$	8,338
2017	6,775
2018	5,786
2019	5,066
2020	3,613
2021 and thereafter	942

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Derivative Instruments and Other Hedging Activities

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Other Hedging Activities

DERIVATIVE INSTRUMENTS AND OTHER HEDGING ACTIVITIES

The Company enters into derivative financial instruments to manage interest rate risk and other exposures such as liquidity and credit risk, as well as to facilitate customer transactions. The primary types of derivatives used by the Company include interest rate swap agreements, foreign exchange contracts, interest rate lock commitments, forward sales commitments, and written and purchased options. All derivative instruments are recognized on the consolidated balance sheets as other assets or other liabilities at fair value, as required by ASC Topic 815, Derivatives and Hedging.

For cash flow hedges, the effective portion of the gain or loss related to the derivative instrument is initially reported as a component of other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings or when the hedge is terminated. The ineffective portion of the gain or loss is reported in earnings immediately. In applying hedge accounting for derivatives, the Company establishes and documents a method for assessing the effectiveness of the hedging derivative and a measurement approach for determining the ineffective aspect of the hedge upon the inception of the hedge. The Company has designated interest rate swaps in a cash flow hedge to convert forecasted variable interest payments to a fixed rate on its junior subordinated debt and has concluded that the forecasted transactions are probable of occurring.

For derivative instruments that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately.

Information pertaining to outstanding derivative instruments is as follows:

	Balance Sheet Location	Asset Derivatives Fair Value				Balance Sheet Location	Liability Derivatives Fair Value
(Dollars in thousands)		December 31, 2015		December 31, 2014			December 31, 2015		December 31, 2014
Derivatives designated as hedging instruments under ASC Topic 815:
Interest rate contracts	Other assets	$	58	$	—	Other liabilities	$	—	$	—
Total derivatives designated as hedging instruments under ASC Topic 815		$	58	$	—		$	—	$	—
Derivatives not designated as hedging instruments under ASC Topic 815:
Interest rate contracts	Other assets	$	18,077	$	15,434	Other liabilities	$	18,077	$	15,434
Foreign exchange contracts	Other assets	156		—		Other liabilities	134		—
Forward sales contracts	Other assets	1,588		25		Other liabilities	474		2,556
Written and purchased options	Other assets	10,607		17,444		Other liabilities	6,254		13,364
Total derivatives not designated as hedging instruments under ASC Topic 815		$	30,428	$	32,903		$	24,939	$	31,354
Total		$	30,486	$	32,903		$	24,939	$	31,354
		Asset Derivatives Notional Amount					Liability Derivatives Notional Amount
(Dollars in thousands)		December 31, 2015		December 31, 2014			December 31, 2015		December 31, 2014
Derivatives designated as hedging instruments under ASC Topic 815:
Interest rate contracts		$	108,500	$	—		$	—	$	—
Total derivatives designated as hedging instruments under ASC Topic 815		$	108,500	$	—		$	—	$	—
Derivatives not designated as hedging instruments under ASC Topic 815:
Interest rate contracts		$	590,334	$	444,703		$	590,334	$	444,703
Foreign exchange contracts		4,392		—			4,392		—
Forward sales contracts		223,841		15,897			173,430		391,992
Written and purchased options		328,210		362,580			181,949		225,741
Total derivatives not designated as hedging instruments under ASC Topic 815		$	1,146,777	$	823,180		$	950,105	$	1,062,436
Total		$	1,255,277	$	823,180		$	950,105	$	1,062,436

The Company is party to collateral agreements with certain derivative counterparties. Such agreements require that the Company maintain collateral based on the fair values of individual derivative transactions. In the event of default by the Company, the counterparty would be entitled to the collateral.

At December 31, 2015 and 2014, the Company was required to post $21.8 million and $11.5 million, respectively, in cash as collateral for its derivative transactions, which are included in "interest-bearing deposits in banks" on the Company’s consolidated balance sheets. The Company does not anticipate additional assets will be required to be posted as collateral, nor does it believe additional assets would be required to settle its derivative instruments immediately if contingent features were triggered at December 31, 2015. The Company’s master netting agreements represent written, legally enforceable bilateral agreements that (1) create a single legal obligation for all individual transactions covered by the master agreement and (2) in the event of default, provide the non-defaulting counterparty the right to accelerate, terminate, and close-out on a net basis all transactions under the agreement and to promptly liquidate or set-off collateral posted by the defaulting counterparty. As permitted by U.S. GAAP, the Company does not offset fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral against recognized fair value amounts of derivatives executed with the same counterparty under a master netting agreement. The following table reconciles the gross amounts presented in the consolidated balance sheets to the net amounts that would result in the event of offset.

	December 31, 2015
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet					Net
(Dollars in thousands)			Derivatives		Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts designated as hedging instruments	$	58	$	—	$	(45	)	$	13
Interest rate contracts not designated as hedging instruments	18,058		—		—			18,058
Written and purchased options	6,277		—		—			6,277
Total derivative assets subject to master netting arrangements	$	24,393	$	—	$	(45	)	$	24,348
Derivative liabilities
Interest rate contracts not designated as hedging instruments	18,058		—		(9,428		)	8,630
Total derivative liabilities subject to master netting arrangements	$	18,058	$	—	$	(9,428	)	$	8,630

(1) Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.

	December 31, 2014
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet					Net
(Dollars in thousands)			Derivatives		Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts designated as hedging instruments	$	—	$	—	$	—		$	—
Interest rate contracts not designated as hedging instruments	15,411		—		—			15,411
Written and purchased options	13,387		—		—			13,387
Total derivative assets subject to master netting arrangements	$	28,798	$	—	$	—		$	28,798
Derivative liabilities
Interest rate contracts not designated as hedging instruments	15,411		—		(3,735		)	11,676
Total derivative liabilities subject to master netting arrangements	$	15,411	$	—	$	(3,735	)	$	11,676

(1) Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.

During the years ended December 31, 2015 and 2014, the Company has not reclassified into earnings any gain or loss as a result of the discontinuance of cash flow hedges, because it was probable the original forecasted transaction would not occur by the end of the originally specified term.

At December 31, 2015, the Company does not expect to reclassify any amount from accumulated other comprehensive income into interest income over the next twelve months for derivatives that will be settled.

At December 31, 2015, 2014, and 2013, and for the years then ended, information pertaining to the effect of the hedging instruments on the consolidated financial statements is as follows:

																Location of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
			Amount of Gain (Loss) Recognized in OCI net of taxes (Effective Portion)					Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
(Dollars in thousands)
			For the Years Ended December 31
Derivatives in ASC Topic 815 Cash Flow Hedging Relationships			2015	2014		2013				2015	2014		2013				2015		2014			2013
	Interest rate contracts	$	38	$	—	$	619	Other income (expense)	$	—	$	—	$	(391	)	Other income (expense)	$	—	$	(1	)	$	1
Total		$	38	$	—	$	619		$	—	$	—	$	(391	)		$	—	$	(1	)	$	1

Information pertaining to the effect of derivatives not designated as hedging instruments on the consolidated financial statements as of December 31, is as follows:

	Location of Gain (Loss) Recognized in Income on Derivatives	Amount of Gain (Loss) Recognized in Income on Derivatives
(Dollars in thousands)		2015			2014			2013
Interest rate contracts	Other income	$	4,143		$	2,513		$	2,991
Foreign exchange contracts	Other income	22			—			—
Forward sales contracts	Mortgage Income	(2,947		)	(3,225		)	(1,716		)
Written and purchased options	Mortgage Income	274			(5,739		)	(3,032		)
Total		$	1,492		$	(6,451	)	$	(1,757	)

At December 31, additional information pertaining to outstanding interest rate swap agreements not designated as hedging instruments is as follows:

(Dollars in thousands)	2015			2014			2013
Weighted average pay rate	3.2		%	2.9		%	3.0		%
Weighted average receive rate	0.9		%	0.4		%	0.2		%
Weighted average maturity in years	7.5 years			7.7 years			7.6 years
Unrealized gain (loss) relating to interest rate swaps	$	—		$	—		$	—

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Deposits

12 Months Ended

Dec. 31, 2015

Banking and Thrift [Abstract]

Deposits

DEPOSITS

Deposits at December 31 are summarized as follows:

(Dollars in thousands)	2015		2014
Non-interest-bearing deposits	$	4,352,229	$	3,195,430
Negotiable order of withdrawal (NOW)	2,974,176		2,462,841
Money market deposits accounts (MMDA)	6,010,882		4,168,504
Savings deposits	716,838		577,513
Certificates of deposit and other time deposits	2,124,623		2,116,237
	$	16,178,748	$	12,520,525

Total time deposits summarized by denomination at December 31 are as follows:

(Dollars in thousands)	2015		2014
Time deposits less than $250,000	$	1,456,804	$	1,767,448
Time deposits greater than $250,000	667,819		348,789
	$	2,124,623	$	2,116,237

A schedule of maturities of all time deposits as of December 31, 2015 is as follows:

(Dollars in thousands)
Years ending December 31
2016	$	1,380,655
2017	423,866
2018	112,915
2019	64,170
2020	81,418
2021 and thereafter	61,599
	$	2,124,623

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Short-Term Borrowings

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Short-Term Borrowings

SHORT-TERM BORROWINGS

Short-term borrowings at December 31 are summarized as follows:

(Dollars in thousands)	2015		2014
Federal Home Loan Bank advances	$	110,000	$	603,000
Securities sold under agreements to repurchase	216,617		242,742
	$	326,617	$	845,742

Securities sold under agreements to repurchase, which are classified as secured borrowings, generally mature daily and are reflected at the amount of cash received in connection with the transaction. The Company may be required to provide additional collateral based on the fair value of the underlying securities.

Additional information on the Company’s short-term borrowings for the years indicated is as follows:

(Dollars in thousands)	2015			2014			2013
Outstanding at December 31	$	326,617		$	845,742		$	680,344
Maximum month-end outstanding balance	798,933			1,034,741			680,344
Average daily outstanding balance	426,011			782,033			303,352
Average rate during the year	0.18		%	0.17		%	0.16		%
Average rate at year end	0.20		%	0.18		%	0.15		%

The Company has various funding arrangements with commercial banks providing up to$180.0 millionin the form of Federal funds and other lines of credit. At December 31, 2015, there werenobalances outstanding on these lines and all of the funding was available to the Company.

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Long-Term Debt

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Long-Term Debt

LONG-TERM DEBT

Long-term debt at December 31 is summarized as follows:

(Dollars in thousands)	2015		2014
IBERIABANK:
Federal Home Loan Bank notes, 0.903% to 7.040%	$	136,628	$	210,549
Notes payable - Investment fund contribution, 7 to 40 year term, 0.50% to 5.00% fixed	83,709		80,843
	220,337		291,392
IBERIABANK Corporation (junior subordinated debt):
Statutory Trust I, 3 month LIBOR (1), plus 3.25%, issued November 2002	10,310		10,310
Statutory Trust II, 3 month LIBOR (1), plus 3.15%, issued June 2003	10,310		10,310
Statutory Trust III, 3 month LIBOR (1), plus 2.00%, issued September 2004	10,310		10,310
Statutory Trust IV, 3 month LIBOR (1), plus 1.60%, issued October 2006	15,464		15,464
American Horizons Statutory Trust I, 3 month LIBOR (1), plus 3.15%, assumed January 2005	6,186		6,186
Statutory Trust V, 3 month LIBOR (1), plus 1.435%, issued June 2007	10,310		10,310
Statutory Trust VI, 3 month LIBOR (1), plus 2.75%, issued November 2007	12,372		12,372
Statutory Trust VII, 3 month LIBOR (1), plus 2.54%, issued November 2007	13,403		13,403
Statutory Trust VIII, 3 month LIBOR (1), plus 3.50%, issued March 2008	7,217		7,217
OMNI Trust I, 3 month LIBOR (1), plus 3.30%, assumed May 2011	8,248		8,248
OMNI Trust II, 3 month LIBOR (1), plus 2.79%, assumed May 2011	7,732		7,732
GA Commerce Trust II, 3 month LIBOR (1), plus 1.64%, assumed May 2015	8,248		—
	120,110		111,862
	$	340,447	$	403,254

(1) The interest rate on the Company’s long-term debt indexed to LIBOR is based on the 3-month LIBOR rate. The 3-month LIBOR rate was0.61%and 0.26% at December 31, 2015 and 2014, respectively.

Outstanding FHLB advances are a mix of bullet and amortizing structures. Amortizing FHLB advances are amortized over periods ranging from 2.5 to 20 years, and have a balloon feature at maturity. Advances are collateralized by a blanket pledge of eligible loans, subject to contractual adjustments which reduce the borrowing base, as well as a secondary pledge of FHLB stock and FHLB demand deposits, the amount of which can exceed the amounts borrowed based on contractually required adjustments. Total additional advances available from the FHLB at December 31, 2015 were$4.6 billionunder the blanket floating lien including $1.2 billion from pledges of investment securities. The weighted average advance rate was 3.79%and 3.24% at December 31, 2015 and 2014, respectively.

Junior subordinated debt consists of a total of $120.1 million in Junior Subordinated Deferrable Interest Debentures of the Company issued to statutory trusts that were funded by the issuance of floating rate capital securities of the trusts. The terms of the junior subordinated debt are 30 years, and they are callable at par by the Company any time after 5 years. Interest is payable quarterly and may be deferred at any time at the election of the Company for up to 20 consecutive quarterly periods. During a deferral period, the Company is subject to certain restrictions, including being prohibited from declaring and paying dividends to its common shareholders.

Effective January 1, 2015, 75% of the Company's junior subordinated debt was excluded from Tier 1 capital for regulatory purposes. The remaining 25% will be excluded effective January 1, 2016.

Advances and long-term debt at December 31, 2015 have maturities or call dates in future years as follows:

(Dollars in thousands)
2016	$	34,789
2017	61,899
2018	21,057
2019	7,865
2020	16,308
2021 and thereafter	198,529
	$	340,447

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Income Taxes

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

The provision for income tax expense consists of the following for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Current expense	$	67,025		$	69,612		$	62,468
Deferred expense (benefit)	4,551			(25,027		)	(35,930		)
Tax credits	(11,268		)	(12,012		)	(11,690		)
ASU 2014-01 Amortization on Low Income Housing Tax Credits	2,023			1,005			251
Tax benefits attributable to items charged to equity and goodwill	1,763			2,105			1,034
	$	64,094		$	35,683		$	16,133

There was a balance receivable of $13 million and $2 million for federal and state income taxes at December 31, 2015 and 2014, respectively. The provision for federal income taxes differs from the amount computed by applying the federal income tax statutory rate of 35 percent on income before income tax expense as indicated in the following analysis for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Federal tax based on statutory rate	$	72,428		$	49,373		$	28,441
Increase (decrease) resulting from:
Effect of tax-exempt income	(6,919		)	(7,064		)	(7,282		)
Interest and other nondeductible expenses	5,899			2,642			2,007
State taxes, net of federal benefit	3,955			2,531			3,237
Tax credits	(11,268		)	(12,012		)	(11,690		)
ASU 2014-01 Amortization on Low Income Housing Tax Credits	2,023			1,005			251
Other	(2,024		)	(792		)	1,169
	$	64,094		$	35,683		$	16,133
Effective tax rate	31.0		%	25.3		%	19.9		%

The composition of other items resulting in a net tax benefit of $2.0 million for the year ending December 31, 2015 arose principally from a decrease of $1.3 million related to effects of prior year amended returns and by $0.6 million for other discrete items, including prior year provision-to-return adjustments.

The net deferred tax asset at December 31 is as follows:

(Dollars in thousands)	2015			2014
Deferred tax asset:
NOL carryforward	$	17,258		$	978
Allowance for credit losses	56,446			59,267
Deferred compensation	7,528			6,631
Basis difference in acquired assets	48,256			53,202
Unrealized loss on securities available for sale	854			—
OREO	6,210			9,845
Other	10,438			13,530
	146,990			143,453
Deferred tax liability:
Basis difference in acquired assets	(31,975		)	(53,940		)
Gain on acquisition	(212		)	(2,426		)
FHLB stock	(122		)	(85		)
Premises and equipment	(1,658		)	(9,652		)
Acquisition intangibles	(7,648		)	(12,151		)
Deferred loan costs	(4,610		)	(3,771		)
Unrealized gain on securities available for sale	—			(4,052		)
Investments acquired	(167		)	(570		)
Swap gain	—			(75		)
Other	(16,694		)	(12,908		)
	(63,086		)	(99,630		)
Net deferred tax asset	$	83,904		$	43,823

Net operating loss carryforwards arising from acquisitions during 2015 expire over a 20-year period and will be utilized subject to annual Internal Revenue Code Section 382 limitations.  No benefit was recognized at acquisition for net operating losses that will expire unused due to the IRS limitations.

The Company determined that the net deferred tax asset is more likely than not to be realized based on an assessment of all available positive and negative evidence and therefore no valuation allowance has been recorded as of December 31, 2015 or 2014.

Retained earnings at December 31, 2015 and 2014 included approximately $21.9 million accumulated prior to January 1, 1987 for which no provision for federal income taxes has been made. If this portion of retained earnings is used in the future for any purpose other than to absorb bad debts, it will be added to future taxable income.

The Company does not believe it has any unrecognized tax benefits included in its consolidated financial statements. The Company has not had any settlements in the current period with taxing authorities, nor has it recognized tax benefits as a result of a lapse of the applicable statute of limitations.

During the years ended December 31, 2015, 2014, and 2013, the Company did not recognize any interest or penalties in its consolidated financial statements, nor has it recorded a liability for interest or penalty payments.

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Capital Requirements and Other Regulatory Matters

12 Months Ended

Dec. 31, 2015

Banking and Thrift [Abstract]

Capital Requirements and Other Regulatory Matters

SHAREHOLDERS' EQUITY, CAPITAL RATIOS AND OTHER REGULATORY MATTERS

During the third quarter of 2015, the Company issued an aggregate of 3,200,000 depositary shares (the “Depositary Shares”), each representing a 1/400th ownership interest in a share of the Company’s 6.625% Fixed-to-Floating Non-Cumulative Perpetual Preferred Stock, Series B, par value $1.00 per share, (“Series B Preferred Stock”), with a liquidation preference of $10,000 per share of Series B Preferred Stock (equivalent to $25 per depositary share) which represents $80,000,000 in aggregate liquidation preference.

Dividends will accrue and be payable on the Series B preferred stock, subject to declaration by the Company’s board of directors, from the date of issuance to, but excluding August 1, 2025, at a rate of 6.625% per annum, payable semi-annually, in arrears, and from and including August 1, 2025, dividends will accrue and be payable at a floating rate equal to three-month LIBOR plus a spread of 426.2 basis points, payable quarterly, in arrears. The Company may redeem the Series B preferred stock at its option, subject to regulatory approval, as described in the Prospectus. On January 4, 2016, the Company declared a semi-annual cash dividend of $0.805 per depositary share , which was paid on February 1, 2016.

The Company and IBERIABANK are subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy regulations and the regulatory framework for prompt corrective action, the Company and IBERIABANK, as applicable, must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

On January 1, 2015, the Company and IBERIABANK became subject to revised capital adequacy standards as implemented by new final rules approved by the U.S. banking regulatory agencies, including the FRB, to implement the revised standards of the BCBS and to address relevant provisions of the Dodd-Frank Act. Certain provisions of the new rules will be phased in from that date to January 1, 2019.

The final rules:

• Require that non-qualifying capital instruments, including trust preferred securities and cumulative perpetual preferred stock, must be fully phased out of Tier 1 capital by January 1, 2016,

• Establish new qualifying criteria for regulatory capital, including new limitations on the inclusion of deferred tax assets and mortgage servicing rights,

• Require a minimum ratio of common equity Tier 1 capital (“CET1”) to risk-weighted assets of 4.5%,

• Increase the minimum Tier 1 capital to risk-weighted assets ratio requirements from 4% to 6%,

• Implement a new capital conservation buffer requirement for a banking organization to maintain a buffer composed of CET1 capital in an amount greater than 2.5% above the minimum CET1 capital, Tier 1 capital and total risk-based capital ratios in order to avoid limitations on capital distributions, including dividend payments, and certain discretionary bonus payments to executive officers, with the buffer to be phased in beginning on January 1, 2016 at 0.625% and increasing annually until fully phased in at 2.5% by January 1, 2019. A banking organization with a buffer of less than the required amount would be subject to increasingly stringent limitations on certain distributions and payments as the buffer approaches zero, and

• Increase capital requirements for past-due loans, high volatility commercial real estate exposures, and certain short-term commitments and securitization exposures.

Management believes that, as of December 31, 2015, the Company and IBERIABANK met all capital adequacy requirements to which they are subject.

As of December 31, 2015, the most recent notification from the FRB categorized IBERIABANK as well-capitalized under the regulatory framework for prompt corrective action (the prompt corrective action requirements are not applicable to the Company). To be categorized as well-capitalized, an institution must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the following table. There are no conditions or events since the notification that management believes have changed that categorization. The Company’s and IBERIABANK’s actual capital amounts and ratios as of December 31 are presented in the following table.

(Dollars in thousands)	2015
	Minimum				Well-Capitalized		Actual
	Amount		Ratio		Amount	Ratio	Amount		Ratio
Tier 1 Leverage
Consolidated	$	751,798	4.00	%	N/A	N/A	$	1,790,034	9.52	%
IBERIABANK	749,226		4.00		936,532	5.00	1,691,022		9.03
Common Equity Tier 1 (CET1) (1)
Consolidated	$	752,610	4.50	%	N/A	N/A	$	1,684,097	10.07	%
IBERIABANK	750,660		4.50		1,084,287	6.50	1,691,022		10.14
Tier 1 risk-based capital
Consolidated	$	1,003,479	6.00	%	N/A	N/A	$	1,790,034	10.70	%
IBERIABANK	1,000,880		6.00		1,334,507	8.00	1,691,022		10.14
Total risk-based capital
Consolidated	$	1,337,973	8.00	%	N/A	N/A	$	2,029,932	12.14	%
IBERIABANK	1,334,507		8.00		1,668,133	10.00	1,843,545		11.05

	2014
	Minimum				Well-Capitalized		Actual
	Amount		Ratio		Amount	Ratio	Amount		Ratio
Tier 1 Leverage
Consolidated	$	602,359	4.00	%	N/A	N/A	$	1,408,141	9.35	%
IBERIABANK	600,121		4.00		750,151	5.00	1,265,540		8.44
Tier 1 risk-based capital
Consolidated	$	504,086	4.00	%	N/A	N/A	$	1,408,141	11.17	%
IBERIABANK	502,421		4.00		753,631	6.00	1,265,540		10.08
Total risk-based capital
Consolidated	$	1,008,171	8.00	%	N/A	N/A	$	1,550,088	12.30	%
IBERIABANK	1,004,841		8.00		1,256,052	10.00	1,407,487		11.21

(1) Beginning January 1, 2016, minimum capital ratios will be subject to a capital conservation buffer of 0.625%. This capital conservation buffer will increase in subsequent years by 0.625% until it is fully phased in on January 1, 2019 at 2.50%.

Restrictions on Dividends, Loans and Advances

IBERIABANK is restricted under applicable laws in the payment of dividends to an amount equal to current year earnings plus undistributed earnings for the immediately preceding year, unless prior permission is received from the Commissioner of Financial Institutions for the State of Louisiana. Dividends payable by IBERIABANK in 2016 without permission will be limited to 2016 earnings plus an additional $148.7 million.

Funds available for loans or advances by IBERIABANK to the Parent amounted to $184.4 million. In addition, any dividends that may be paid by IBERIABANK to the Parent would be restricted if IBERIABANK did not comply with the above-described capital conservation buffer requirements and would be prohibited if the effect thereof would cause IBERIABANK’s capital to be reduced below applicable minimum capital requirements.

During any deferral period under the Company’s junior subordinated debt, the Company would be prohibited from declaring and paying dividends to preferred and common shareholders. In addition, so long as any shares of Series B Preferred Stock remain outstanding, we are prohibited from paying dividends on any of our common stock if the required payments on our Series B Preferred Stock have not been made. See Note 14 to the consolidated financial statements for additional information.

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Earnings Per Share

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share

EARNINGS PER SHARE

Share-based payment awards that entitle holders to receive non-forfeitable dividends before vesting are considered participating securities that are included in the calculation of earnings per share using the two-class method. The two-class method is an earnings allocation formula under which earnings per share is calculated for common stock and participating securities according to dividends declared and participating rights in undistributed earnings. Under this method, all earnings, distributed and undistributed, are allocated to common shares and participating securities based on their respective rights to receive dividends.

The following table presents the calculation of basic and diluted earnings per share for the periods indicated.

	For the Years Ended December 31,
(In thousands, except per share data)	2015			2014			2013
Earnings per common share - basic
Net income	$	142,844		$	105,382		$	65,128
Dividends and undistributed earnings allocated to unvested restricted shares	(1,680		)	(1,651		)	(1,205		)
Net income allocated to common shareholders - basic	$	141,164		$	103,731		$	63,923
Weighted average common shares outstanding	38,214			31,307			29,052
Earnings per common share - basic	3.69			3.31			2.20
Earnings per common share - diluted
Net income allocated to common shareholders - basic	$	141,164		$	103,731		$	63,923
Dividends and undistributed earnings allocated to unvested restricted shares	(48		)	(34		)	(4		)
Net income allocated to common shareholders - diluted	$	141,116		$	103,697		$	63,919
Weighted average common shares outstanding	38,214			31,307			29,052
Dilutive potential common shares	96			126			53
Weighted average common shares outstanding - diluted	38,310			31,433			29,105
Earnings per common share outstanding - diluted	$	3.68		$	3.30		$	2.20

For the years ended December 31, 2015, 2014, and 2013, the calculations for basic shares outstanding exclude the weighted average shares owned by the Recognition and Retention Plan (“RRP”) of 607,608; 625,555; and 642,008, respectively.

The effects from the assumed exercises of 159,236; 13,101; and 483,696 stock options were not included in the computation of diluted earnings per share for the years ended December 31, 2015, 2014, and 2013, respectively, because such amounts would have had an antidilutive effect on earnings per common share.

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Share-Based Compensation

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

SHARE-BASED COMPENSATION

The Company has various types of share-based compensation plans that permit the granting of awards in the form of stock options, restricted stock, restricted share units, phantom stock and performance units. These plans are administered by the Compensation Committee of the Board of Directors, which selects persons eligible to receive awards and determines the terms, conditions and other provisions of the awards. At December 31, 2015, awards of 784,254 shares could be made under approved incentive compensation plans. The Company issues shares to fulfill stock option exercises and restricted share units and restricted stock awards vesting from available authorized common shares. At December 31, 2015, the Company believes there are adequate authorized shares to satisfy anticipated stock option exercises and restricted share unit and restricted stock award vesting.

Stock option awards

The Company issues stock options under various plans to directors, officers and other key employees. The option exercise price cannot be less than the fair value of the underlying common stock as of the date of the option grant and the maximum option term cannot exceed ten years.

The following table represents the activity related to stock options during the periods indicated:

	Number of Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value (Dollars in thousands)		Weighted Average Remaining Contract Life (in years)
Outstanding options, December 31, 2012	1,236,075		$	51.48
Granted	75,722		52.36
Exercised	(200,748	)	40.35		$	2,740
Forfeited or expired	(38,220	)	55.87
Outstanding options, December 31, 2013	1,072,829		$	53.47
Granted	77,434		65.31
Exercised	(267,421	)	48.57		4,612
Forfeited or expired	(15,160	)	60.38
Outstanding options, December 31, 2014	867,682		$	55.92
Granted	82,001		62.50
Exercised	(119,917	)	51.71		1,516
Forfeited or expired	(15,989	)	66.52
Outstanding options, December 31, 2015	813,777		$	56.99	$	1,061	5.1
Exercisable options, December 31, 2013	707,934		53.54
Exercisable options, December 31, 2014	562,752		55.92
Exercisable options, December 31, 2015	546,842		$	56.54	$	665	3.9

The following table represents weighted average remaining life as of December 31, 2015 for options outstanding within the stated exercise prices:

	Options Outstanding				Options Exercisable
Exercise Price Range Per Share	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Life	Number of Options	Weighted Average Exercise Price
$36.48 to $51.69	108,856	$	50.05	5.4 years	70,437	$	49.69
$51.70 to $52.88	170,627	52.34		6.5 years	86,365	52.34
$52.89 to $56.26	133,884	54.94		4.3 years	124,397	54.89
$56.27 to $59.04	121,591	57.53		1.2 years	119,855	57.52
$59.05 to $62.39	119,583	59.92		3.4 years	116,867	59.87
$62.40 to $111.71	159,236	65.83		8.2 years	28,921	75.41
Total options	813,777	$	56.99	5.1 years	546,842	$	56.54

The Company uses the Black-Scholes option pricing model to estimate the fair value of stock option awards. The following weighted-average assumptions were used for option awards issued during the years ended December 31:

	2015			2014			2013
Expected dividends	2.2		%	2.1		%	2.6		%
Expected volatility	35.6		%	35.8		%	34.8		%
Risk-free interest rate	2.0		%	2.3		%	1.7		%
Expected term (in years)	7.5			7.5			8.6
Weighted-average grant-date fair value	$	19.57		$	21.26		$	15.37

The assumptions above are based on multiple factors, including historical stock option exercise patterns and post-vesting employment termination behaviors, expected future exercise patterns and the expected volatility of the Company’s stock price.

The following table represents the compensation expense that is included in non-interest expense and related income tax benefits in the accompanying consolidated statements of comprehensive income related to stock options for the years ended December 31:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to stock options	$	1,861	$	2,053	$	2,110
Income tax benefit related to stock options	317		375		379

At December 31, 2015, there was $2.7 million of unrecognized compensation cost related to stock options that is expected to be recognized over a weighted-average period of 5.1 years.

Restricted stock awards

The Company issues restricted stock under various plans for certain officers and directors. The restricted stock awards may not be sold or otherwise transferred until certain restrictions have lapsed. The holders of the restricted stock receive dividends and have the right to vote the shares. The compensation expense for these awards is determined based on the market price of the Company's common stock at the date of grant applied to the total number of shares granted and is recognized over the vesting period (generally three to seven years). As of December 31, 2015 and 2014, unrecognized share-based compensation associated with these awards totaled $19.5 million and $19.8 million, respectively. The unrecognized compensation cost related to restricted stock awards at December 31, 2015 is expected to be recognized over a weighted-average period of 2.7 years.

Restricted share units

In 2015 and 2014, the Company issued restricted share units to certain of its executive officers. Restricted share units vest after the end of a three years performance period, based on satisfaction of the market and performance conditions set forth in the restricted share unit agreement. Recipients do not possess voting or investment power over the common stock underlying such units until vesting. The grant date fair value of these restricted share units is the same as the value of the corresponding number of shares of common stock, adjusted for assumptions surrounding the market-based conditions contained in the respective agreements. See Note 1 for further discussion of restricted share units with market or performance conditions.

The following table represents the compensation expense that was included in non-interest expense and related income tax benefits in the accompanying consolidated statements of comprehensive income related to restricted stock awards and restricted share units for the years ended December 31:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to restricted stock awards and restricted share units	$	12,045	$	9,932	$	8,593
Income tax benefit related to restricted stock awards and restricted share units	4,215		3,476		3,008

The following table represents unvested restricted stock award and restricted share unit activity for the years ended December 31:

	2015		2014		2013
Balance at beginning of period	506,289		523,756		538,202
Granted	207,575		168,254		167,095
Forfeited	(26,970	)	(18,171	)	(28,713	)
Earned and issued	(179,764	)	(167,550	)	(152,828	)
Balance at end of period	507,130		506,289		523,756

The weighted average grant date fair value of restricted stock awards and restricted share units granted was $63.16, $65.11, and $51.98 for the years ended December 31, 2015, 2014, and 2013, respectively. The total fair value of restricted stock awards and restricted share units vested during the years ended December 31, 2015, 2014, and 2013 was $11.3 million, $10.9 million, and $7.8 million, respectively.

Phantom stock awards

The Company issues phantom stock awards to certain key officers and employees. The award is subject to a vesting period of five to seven years and is paid out in cash upon vesting. The amount paid per vesting period is calculated as the number of vested “share equivalents” multiplied by the closing market price of a share of the Company’s common stock on the vesting date. Share equivalents are calculated on the date of grant as the total award’s dollar value divided by the closing market price of a share of the Company’s common stock on the grant date. Award recipients are also entitled to a “dividend equivalent” on each unvested share equivalent held by the award recipient. A dividend equivalent is a dollar amount equal to the cash dividends that the participant would have been entitled to receive if the participant’s share equivalents were issued in shares of common stock. Dividend equivalents are reinvested as share equivalents that will vest and be paid out on the same date as the underlying share equivalents on which the dividend equivalents were paid. The number of share equivalents acquired with a dividend equivalent is determined by dividing the aggregate of dividend equivalents paid on the unvested share equivalents by the closing price of a share of the Company’s common stock on the dividend payment date.

Performance units

In 2015 and 2014, the Company issued performance units to certain of its executive officers. Performance units are tied to the value of shares of the Company's common stock, are payable in cash, and vest in increments of one-third per year after attainment of one or more performance measures. The value of performance units is the same as the value of the corresponding number of shares of common stock.

The following table indicates compensation expense recorded for phantom stock and performance units based on the number of share equivalents vested at December 31 of the years indicated and the current market price of the Company’s stock at that time:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to phantom stock and performance units	$	12,109	$	5,496	$	4,855

The following table represents phantom stock award and performance unit activity during the periods indicated.

(Dollars in thousands)	Number of share equivalents (1)		Value of share equivalents (2)
Balance, December 31, 2012	328,273		$	16,125
Granted	179,041		11,253
Forfeited share equivalents	(18,744	)	1,178
Vested share equivalents	(54,686	)	2,937
Balance, December 31, 2013	433,884		$	27,270
Granted	146,166		9,479
Forfeited share equivalents	(22,800	)	1,479
Vested share equivalents	(81,903	)	5,512
Balance, December 31, 2014	475,347		$	30,826
Granted	167,573		9,228
Forfeited share equivalents	(34,681	)	1,910
Vested share equivalents	(145,809	)	9,288
Balance, December 31, 2015	462,430		$	25,466

(1) Number of share equivalents includes all reinvested dividend equivalents for the years indicated.

(2) Except for share equivalents at the beginning of each period, which are based on the value at that time, and vested share payments, which are based on the cash paid at the time of vesting, the value of share equivalents is calculated based on the market price of the Company’s stock at the end of the respective periods. The market price of the Company’s stock was $55.07, $64.85 and $62.85 on December 31, 2015, 2014 and 2013, respectively.

401(k) defined contribution plan

The Company has a 401(k) Profit Sharing Plan covering substantially all of its employees. Annual employer contributions to the Plan are set by the Board of Directors. The Company made contributions of $1.7 million, $1.5 million, and 1.3 million for the years ended December 31, 2015, 2014, and 2013, respectively. The Plan provides, among other things, that participants in the Plan be able to direct the investment of their account balances within the Profit Sharing Plan into alternative investment funds. Participant deferrals under the salary reduction election may be matched by the employer based on a percentage to be determined annually by the employer.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

Off-balance sheet commitments

In the normal course of business, to meet the financing needs of its customers, the Company is a party to credit related financial instruments, with risk not reflected in the consolidated financial statements. These financial instruments include commitments to extend credit, standby letters of credit, and commercial letters of credit. Such commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets. The credit policies used for these commitments are consistent with those used for on-balance sheet instruments. The Company’s exposure to credit loss in the event of non-performance by its customers under such commitments or letters of credit represents the contractual amount of the financial instruments as indicated in the table below. At December 31, 2015 and 2014, the fair value of guarantees under commercial and standby letters of credit was $1.5 million and $1.3 million, respectively. This fair value amount represents the unamortized fees associated with these guarantees and is included in “other liabilities” on the Company's consolidated balance sheets. This fair value will decrease as the existing commercial and standby letters of credit approach their expiration dates.

At December 31, the Company had the following financial instruments outstanding and related reserves, whose contract amounts represent credit risk:

(Dollars in thousands)	2015		2014
Commitments to grant loans	$	61,240	$	161,350
Unfunded commitments under lines of credit	4,617,802		4,007,954
Commercial and standby letters of credit	150,281		134,882
Reserve for unfunded lending commitments	14,145		11,801

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to be drawn upon, the total commitment amounts generally represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral, if any, is based on management’s credit evaluation of the customer.

Unfunded commitments under commercial lines of credit, revolving credit lines, and overdraft protection agreements are commitments for possible future extensions of credit to existing customers. Many of these types of commitments do not contain a specified maturity date and may not be drawn upon to the total extent to which the Company is committed. See Note 6 for additional discussion related to the Company’s unfunded lending commitments.

Commercial and standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements, including commercial paper issuance, bond financing, and similar transactions. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. When necessary they are collateralized, generally in the form of marketable securities and cash equivalents.

Legal proceedings

The nature of the business of the Company’s banking and other subsidiaries ordinarily results in a certain amount of claims, litigation, investigations, and legal and administrative cases and proceedings, all of which are considered incidental to the normal conduct of business. Some of these claims are against entities or assets of which the Company is a successor or acquired in business acquisitions and certain of these claims will be covered by loss sharing agreements with the FDIC. The Company has asserted defenses to these litigations and, with respect to such legal proceedings, intends to continue to defend itself vigorously, litigating or settling cases according to management’s judgment as to what is in the best interest of the Company and its shareholders.

The Company assesses its liabilities and contingencies in connection with outstanding legal proceedings utilizing the latest information available. Where it is probable that the Company will incur a loss and the amount of the loss can be reasonably estimated, the Company records a liability in its consolidated financial statements. These legal reserves may be increased or decreased to reflect any relevant developments on a quarterly basis. Where a loss is not probable or the amount of loss is not estimable, the Company does not accrue legal reserves. While the outcome of legal proceedings is inherently uncertain, based on information currently available, advice of counsel, and available insurance coverage, the Company’s management believes that it has established appropriate legal reserves. Any liabilities arising from pending legal proceedings are not expected to have a material adverse effect on the Company’s consolidated financial position, consolidated results of operations, or consolidated cash flows. However, in the event of unexpected future developments, it is possible that the ultimate resolution of these matters, if unfavorable, may be material to the Company’s consolidated financial position, consolidated results of operations, or consolidated cash flows.

As of the date of this filing, the Company believes the amount of losses associated with legal proceedings that it is reasonably possible to incur above amounts already accrued is immaterial.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

Recurring fair value measurements

The Company has segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to estimate the fair value at the measurement date in the tables below. See Note 1, Summary of Significant Accounting Policies, for a description of how fair value measurements are determined.

	December 31, 2015
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Securities available for sale	$	—	$	2,800,286	$	—	$	2,800,286
Mortgage loans held for sale	—		166,247		—		166,247
Derivative instruments	—		30,486		—		30,486
Total	$	—	$	2,997,019	$	—	$	2,997,019
Liabilities
Derivative instruments	$	—	$	24,939	$	—	$	24,939
Total	$	—	$	24,939	$	—	$	24,939
	December 31, 2014
	Level 1		Level 2		Level3		Total
Assets
Securities available for sale	$	—	$	2,158,853	$	—	$	2,158,853
Mortgage loans held for sale	—		139,950		—		139,950
Derivative instruments	—		32,903		—		32,903
Total	$	—	$	2,331,706	$	—	$	2,331,706
Liabilities
Derivative instruments	$	—	$	31,354	$	—	$	31,354
Total	$	—	$	31,354	$	—	$	31,354

During 2015, there were no transfers between the Level 1 and Level 2 fair value categories. During 2014, available for sale securities with a market value of $14.4 million were transferred from the Level 1 to Level 2 fair value category in the table above. The security was issued by Freddie Mac and was included in the Level 1 category at December 31, 2013 based on a recent trade price in the open market.

Gains and losses (realized and unrealized) included in earnings (or accumulated other comprehensive income) during 2015 related to assets and liabilities measured at fair value on a recurring basis are reported in non-interest income or other comprehensive income as follows:

(Dollars in thousands)	Non-interest income		Other comprehensive income
Total gains (losses) included in earnings	$	2,939	$	—
Change in unrealized gains (losses) relating to assets still held at December 31, 2015	—		(9,110		)

Non-recurring fair value measurements

The Company has segregated all financial assets and liabilities that are measured at fair value on a non-recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below.

	December 31, 2015
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
OREO, net	$	—	$	1,106	$	—	$	1,106
Total	$	—	$	1,106	$	—	$	1,106
	December 31, 2014
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
OREO, net	$	—	$	1,483	$	—	$	1,483
Total	$	—	$	1,483	$	—	$	1,483

The tables above exclude the initial measurement of assets and liabilities that were acquired as part of the acquisitions completed in 2014 and 2015. These assets and liabilities were recorded at their fair value upon acquisition in accordance with U.S. GAAP and were not re-measured during the periods presented unless specifically required by U.S. GAAP. Acquisition date fair values represent either Level 2 fair value measurements (investment securities, OREO, property, equipment, and debt) or Level 3 fair value measurements (loans, deposits, and core deposit intangible asset).

The Company did not record any liabilities at fair value for which measurement of the fair value was made on a non-recurring basis during the years ended December 31, 2015, 2014 and 2013.

Fair value option

The Company has elected the fair value option for certain originated residential mortgage loans held for sale, which allows for a more effective offset of the changes in fair values of the loans and the derivative instruments used to hedge them without the burden of complying with the requirements for hedge accounting.

The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for mortgage loans held for sale measured at fair value:

	December 31, 2015						December 31, 2014
(Dollars in thousands)	Aggregate Fair Value		Aggregate Unpaid Principal		Aggregate Fair Value Less Unpaid Principal		Aggregate Fair Value		Aggregate Unpaid Principal		Aggregate Fair Value Less Unpaid Principal
Mortgage loans held for sale, at fair value	$	166,247	$	161,083	$	5,164	$	139,950	$	134,639	$	5,311

Interest income on mortgage loans held for sale is recognized based on contractual rates and is reflected in interest income on loans held for sale in the consolidated statements of comprehensive income. Changes in fair value of these loans that were recorded in mortgage income in the consolidated statements of comprehensive income resulted in net losses of $1.0 million and $3.5 million for the years ended December 31, 2015 and 2014, respectively. Net gains resulting from the change in fair value of these loans were $0.4 million for the year ended December 31, 2013. The changes in fair value are mostly offset by economic hedging activities, with an immaterial portion of these changes attributable to changes in instrument-specific credit risk.

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Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair value of a financial instrument is the current amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. ASC Topic 825, Financial Instruments, excludes certain financial instruments and all non-financial instruments from its disclosure requirements. Consequently, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company.

The carrying amount and estimated fair values, as well as the level within the fair value hierarchy, of the Company’s financial instruments are included in the tables below. See Note 1, Summary of Significant Accounting Policies, for a description of how fair value measurements are determined.

	December 31, 2015
(Dollars in thousands)	Carrying  Amount		Fair Value		Level 1		Level 2		Level 3
Financial Assets
Cash and cash equivalents	$	510,267	$	510,267	$	510,267	$	—	$	—
Investment securities	2,899,214		2,901,247		—		2,901,247		—
Loans and loans held for sale, net of unearned income and allowance for loan losses	14,355,297		14,674,749		—		166,247		14,508,502
FDIC loss share receivables	39,878		9,163		—		—		9,163
Derivative instruments	30,486		30,486		—		30,486		—
Financial Liabilities
Deposits	$	16,178,748	$	15,696,245	$	—	$	—	$	15,696,245
Short-term borrowings	326,617		326,617		326,617		—		—
Long-term debt	340,447		309,847		—		—		309,847
Derivative instruments	24,939		24,939		—		24,939		—
	December 31, 2014
(Dollars in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial Assets
Cash and cash equivalents	$	548,095	$	548,095	$	548,095	$	—	$	—
Investment securities	2,275,813		2,278,334		—		2,278,334		—
Loans and loans held for sale, net of unearned income and allowance for loan losses	11,450,985		11,475,315		—		139,950		11,335,365
FDIC loss share receivables	69,627		19,606		—		—		19,606
Derivative instruments	32,903		32,903		—		32,903		—
Financial Liabilities
Deposits	$	12,520,525	$	12,298,017	$	—	$	—	$	12,298,017
Short-term borrowings	845,742		845,742		845,742		—		—
Long-term debt	403,254		376,139		—		—		376,139
Derivative instruments	31,354		31,354		—		31,354		—

The fair value estimates presented herein are based upon pertinent information available to management as of December 31, 2015 and 2014. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and, therefore, current estimates of fair value may differ significantly from the amounts presented herein.

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Related Party Transactions

12 Months Ended

Dec. 31, 2015

Related Party Transactions [Abstract]

Related Party Transactions

RELATED PARTY TRANSACTIONS

In the ordinary course of business, the Company may execute transactions with various related parties. These transactions are consummated at terms equivalent to the prevailing market rates and terms at the time. Examples of such transactions may include lending or deposit arrangements, transfers of financial assets, services for administrative support, and other miscellaneous items.

The Company has granted loans to executive officers and directors and their affiliates. These loans, including the related principal additions, principal payments, and unfunded commitments are immaterial to the consolidated financial statements at December 31, 2015 and 2014. None of the related party loans were classified as non-accrual, past due, troubled debt restructurings, or potential problem loans at December 31, 2015 and 2014.

Deposits from related parties held by the Company were also immaterial at December 31, 2015 and 2014.

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Business Segments

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Business Segments

BUSINESS SEGMENTS

Each of the Company’s reportable operating segments serves the specific needs of the Company’s customers based on the products and services it offers. The reportable segments are based upon those revenue-producing components for which separate financial information is produced internally and primarily reflect the manner in which resources are allocated and performance is assessed. Further, the reportable operating segments are also determined based on the quantitative thresholds prescribed within ASC Topic 280, Segment Reporting, and consideration of the usefulness of the information to the users of the consolidated financial statements.

The Company reports the results of its operations through three reportable segments: IBERIABANK, IMC, and LTC. The IBERIABANK segment represents the Company’s commercial and retail banking functions, including its lending, investment, and deposit activities. IBERIABANK also includes the Company’s wealth management, capital markets, and other corporate functions. The IMC segment represents the Company’s origination, funding, and subsequent sale of one-to-four family residential mortgage loans. The LTC segment represents the Company’s title insurance and loan closing services.

Certain expenses not directly attributable to a specific reportable segment are allocated to segments based on pre-determined methods that reflect utilization. Also within IBERIABANK are certain reconciling items that translate reportable segment results into consolidated results. The following tables present certain information regarding our operations by reportable segment, including a reconciliation of segment results to reported consolidated results for the periods presented. Reconciling items between segment results and reported results include:

• Elimination of interest income and interest expense representing interest earned by IBERIABANK on interest-bearing checking accounts held by related companies, as well as the elimination of the related deposit balances at the IBERIABANK segment;

• Elimination of investment in subsidiary balances on certain operating segments included in total and average segment assets; and

• Elimination of intercompany due to and due from balances on certain operating segments that are included in total and average segment assets.

	Year Ended December 31, 2015
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	639,793		$	7,062		$	3		$	646,858
Interest expense	56,222			2,878			—			59,100
Net interest income	583,571			4,184			3			587,758
Provision for loan losses	30,908			—			—			30,908
Mortgage income	1,426			79,696			—			81,122
Title revenue	—			—			22,837			22,837
Other non-interest income	116,443			(2		)	(7		)	116,434
Allocated expenses	(16,253		)	12,036			4,217			—
Non-interest expense	495,158			57,784			17,363			570,305
Income before income tax expense	191,627			14,058			1,253			206,938
Income tax expense	58,006			5,581			507			64,094
Net income	$	133,621		$	8,477		$	746		$	142,844
Total loans and loans held for sale, net of unearned income	$	14,305,663		$	188,012		$	—		$	14,493,675
Total assets	19,220,085			256,888			27,095			19,504,068
Total deposits	16,173,831			4,917			—			16,178,748
Average assets	18,146,216			230,819			25,671			18,402,706

	Year Ended December 31, 2014
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	498,820		$	5,992		$	3		$	504,815
Interest expense	42,983			1,721			—			44,704
Net interest income	455,837			4,271			3			460,111
Provision for loan losses	18,966			94			—			19,060
Mortgage income	71			51,726			—			51,797
Title revenue	—			—			20,492			20,492
Other non-interest income	101,401			(61		)	(1		)	101,339
Allocated expenses	(11,602		)	8,203			3,399			—
Non-interest expense	412,165			44,761			16,688			473,614
Income before income tax expense	137,780			2,878			407			141,065
Income tax expense	34,352			1,148			183			35,683
Net income	$	103,428		$	1,730		$	224		$	105,382
Total loans and loans held for sale, net of unearned income	$	11,415,973		$	165,143		$	—		$	11,581,116
Total assets	15,537,731			194,156			26,017			15,757,904
Total deposits	12,515,329			5,196			—			12,520,525
Average assets	14,430,768			176,003			25,223			14,631,994

	Year Ended December 31, 2013
(Dollars in thousands)	IBERIABANK			IMC			LTC		Consolidated
Interest and dividend income	$	431,418		$	5,747		$	32	$	437,197
Interest expense	45,150			1,803			—		46,953
Net interest income	386,268			3,944			32		390,244
Provision for loan losses	5,123			22			—		5,145
Mortgage income	2			64,195			—		64,197
Title revenue	—			—			20,526		20,526
Other non-interest income	84,243			(10		)	2		84,235
Allocated expenses	(7,453		)	5,417			2,036		—
Non-interest expense	406,380			49,723			16,693		472,796
Income before income tax expense	66,463			12,967			1,831		81,261
Income tax expense	10,299			5,093			741		16,133
Net income	$	56,164		$	7,874		$	1,090	$	65,128
Total loans and loans held for sale, net of unearned income	$	9,472,908		$	147,553		$	—	$	9,620,461
Total assets	13,167,162			173,131			25,257		13,365,550
Total deposits	10,734,030			2,970			—		10,737,000
Average assets	12,794,997			183,513			25,478		13,003,988

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Condensed Parent Company Only Financial Statements

12 Months Ended

Dec. 31, 2015

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Parent Company Only Financial Statements

CONDENSED PARENT COMPANY ONLY FINANCIAL STATEMENTS

Condensed financial statements of the Parent are shown below. The Parent has no significant operating activities.

Condensed Balance Sheets

(Dollars in thousands)	December 31
	2015		2014
Assets
Cash in bank	$	154,298	$	36,064
Investments in subsidiaries	2,449,325		1,841,420
Other assets	54,454		119,493
	$	2,658,077	$	1,996,977
Liabilities and Shareholders’ Equity
Liabilities	$	159,242	$	144,829
Shareholders’ equity	2,498,835		1,852,148
	$	2,658,077	$	1,996,977

Condensed Statements of Income

	Year Ended December 31
(Dollars in thousands)	2015			2014			2013
Operating income
Dividends from bank subsidiary	$	—		$	—		$	49,000
Dividends from non-bank subsidiaries	—			—			1,511
Reimbursement of management expenses	59,255			46,433			34,474
Other income	(329		)	437			869
Total operating income	58,926			46,870			85,854
Operating expenses
Interest expense	3,393			3,224			3,232
Salaries and employee benefits expense	41,689			31,981			29,159
Other expenses	17,492			14,576			13,651
Total operating expenses	62,574			49,781			46,042
Income (loss) before income tax benefit and increase in equity in undistributed earnings of subsidiaries	(3,648		)	(2,911		)	39,812
Income tax expense (benefit)	800			(518		)	(2,808		)
Income (loss) before equity in undistributed earnings of subsidiaries	(4,448		)	(2,393		)	42,620
Equity in undistributed earnings of subsidiaries	147,292			107,775			22,508
Net income	$	142,844		$	105,382		$	65,128

Condensed Statements of Cash Flows

(Dollars in thousands)	Year Ended December 31
	2015			2014			2013
Cash Flow from Operating Activities
Net income	$	142,844		$	105,382		$	65,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	416			595			2,035
Net income of subsidiaries	(147,292		)	(107,775		)	(73,044		)
Share-based compensation cost	13,906			11,985			10,703
Gain on sale of assets	(110		)	—			—
Tax benefit associated with share-based payment arrangements	(580		)	(2,105		)	(886		)
Other, net	82,105			(27,274		)	7,575
Net Cash Provided by (Used in) Operating Activities	91,289			(19,192		)	11,511
Cash Flow from Investing Activities
Cash paid in excess of cash received for acquisitions	(5,054		)	4,783			—
Proceeds from sale of premises and equipment	12			—			11,751
Purchases of premises and equipment	(2		)	(36		)	(5,247		)
Return of capital from (Capital contributed to) subsidiary	5,000			(14,600		)	—
Dividends received from subsidiaries	—			—			50,511
Net Cash (Used in) Provided by Investing Activities	(44		)	(9,853		)	57,015
Cash Flow from Financing Activities
Cash dividends paid on common stock	(52,318		)	(43,070		)	(40,332		)
Proceeds from common stock transactions	5,535			11,693			8,101
Payments to repurchase common stock	(3,620		)	(3,727		)	(2,280		)
Net proceeds from issuance of preferred stock	76,812			—			—
Tax benefit associated with share-based payment arrangements	580			2,105			886
Net Cash Provided by (Used In) Financing Activities	26,989			(32,999		)	(33,625		)
Net Increase (Decrease) in Cash and Cash Equivalents	118,234			(62,044		)	34,901
Cash and Cash Equivalents at Beginning of Period	36,064			98,108			63,207
Cash and Cash Equivalents at End of Period	$	154,298		$	36,064		$	98,108

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Reclassification

Reclassification

Certain amounts reported in prior periods have been reclassified to conform to the current period presentation. These reclassifications did not have a material effect on previously reported consolidated financial statements.

Principles of Consolidation

PRINCIPLES OF CONSOLIDATION

The Company’s consolidated financial statements include all entities in which the Company has a controlling financial interest under either the voting interest or variable interest model. The assessment of whether or not the Company has a controlling interest (i.e., the primary beneficiary) in a VIE is performed on an on-going basis. All equity investments in non-consolidated VIEs are included in "other assets" in the Company’s consolidated balance sheets. The Company’s maximum exposure to loss as a result of its involvement with non-consolidated VIEs was approximately $160 million and $151 million at December 31, 2015 and 2014, respectively. The Company's maximum exposure to loss was equivalent to the carrying value of its investments and any related outstanding loans to the non-consolidated VIEs.

Investments in entities that are not consolidated are accounted for under either the equity, cost, or proportional amortization method of accounting. Investments for which the Company has the ability to exercise significant influence over the operating and financing decisions of the entity are accounted for under the equity method. Investments for which the Company does not hold such ability are accounted for under the cost method. Investments in qualified affordable housing projects, which meet certain criteria, are accounted for under the proportional amortization method.

The consolidated financial statements include the accounts of the Company and its subsidiaries, IBERIABANK; Lenders Title Company; IBERIA Capital Partners, LLC; 1887 Leasing, LLC; IBERIA Asset Management, Inc.; 840 Denning, LLC; and IBERIA CDE, LLC. All significant intercompany balances and transactions have been eliminated in consolidation. All normal, recurring adjustments which, in the opinion of management, are necessary for a fair presentation of the financial statements have been included.

Nature of Operations

NATURE OF OPERATIONS

The Company offers commercial and retail banking products and services to customers throughout locations in seven states through IBERIABANK. The Company also operates mortgage production offices in 10 states through IMC and offers a full line of title insurance and closing services throughout Arkansas and Louisiana through LTC and its subsidiaries. ICP provides equity research, institutional sales and trading, and corporate finance services throughout the energy industry. 1887 Leasing, LLC owns an aircraft used by management of the Company. IAM provides wealth management and trust services for commercial and private banking clients. CDE is engaged in the purchase of tax credits.

Use of Estimates

USE OF ESTIMATES

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Material estimates that are susceptible to significant change in the near term are the allowance for credit losses, valuation of and accounting for acquired loans, goodwill and other intangibles, and income taxes.

Concentration of Credit Risks

CONCENTRATION OF CREDIT RISKS

Most of the Company’s business activity is with customers located within the states of Louisiana, Florida, Arkansas, Alabama, Texas, Georgia, and Tennessee. The Company’s lending activity is concentrated in its market areas in those states. The Company has emphasized originations of commercial loans and private banking loans, defined as loans to larger consumer clients. Repayments on loans are expected to come from cash flows of the borrower and/or guarantor. Losses on secured loans are limited by the value of the collateral upon default of the borrowers and guarantor support. The Company does not have any significant concentrations to any one industry or customer.

Business Combinations

BUSINESS COMBINATIONS

Assets and liabilities acquired in business combinations are recorded at their acquisition date fair values. In accordance with ASC Topic 805, Business Combinations, the Company generally records provisional amounts at the time of acquisition based on the information available to the Company. The provisional estimates of fair values may be adjusted for a period of up to one year (“measurement period”) from the date of acquisition if new information obtained about facts and circumstances that existed as of the acquisition date, if known, would have affected the measurement of the amounts recognized as of that date. Subsequent to the Company's early adoption of ASU No. 2015-16 during the third quarter of 2015, adjustments recorded during the measurement period are recognized in the current reporting period.

Loans generally represent a significant portion of the assets acquired in the Company’s business acquisitions. If the Company discovers that it has materially underestimated the credit losses expected in the loan portfolio based on information available at the acquisition date within the measurement period, it will reduce or eliminate the gain and/or increase goodwill recorded on the acquisition in the period the adjustment is recorded. If the Company determines that losses arose subsequent to acquisition date, such losses are reflected as a provision for credit losses.

Cash and Cash Equivalents

CASH AND CASH EQUIVALENTS

For purposes of presentation in the consolidated statements of cash flows, cash and cash equivalents are defined as cash, interest-bearing deposits, and non-interest-bearing demand deposits at other financial institutions with original maturities less than three months. IBERIABANK may be required to maintain average balances on hand or with the Federal Reserve Bank to meet regulatory reserve and clearing requirements. At December 31, 2015 and 2014, IBERIABANK had sufficient cash deposited with the Federal Reserve Bank to cover the required reserve balance.

Investment Securities

INVESTMENT SECURITIES

Management determines the appropriate accounting classification of debt and equity securities at the time of acquisition and re-evaluates such designations at least quarterly. Debt securities that management has the ability and intent to hold to maturity are classified as HTM and carried at cost, adjusted for amortization of premiums and accretion of discounts using methods approximating the interest method. Securities acquired with the intention of recognizing short-term profits or which are actively bought and sold are classified as trading securities and reported at fair value, with unrealized gains and losses recognized in earnings. Securities not classified as HTM or trading, including equity securities with readily determinable fair values, are classified as AFS and recorded at fair value, with unrealized gains and losses excluded from earnings and reported in AOCI. Credit-related declines in the fair value of debt and marketable equity securities that are considered OTTI are recorded in earnings.

The Company evaluates its investment securities portfolio on a quarterly basis for indicators of OTTI. Declines in the fair value of individual HTM and AFS securities below their amortized cost basis are reviewed to determine whether the declines are other than temporary. In estimating OTTI losses, management considers 1) the length of time and the extent to which the fair value has been less than the amortized cost basis, 2) the financial condition and near-term prospects of the issuer, 3) its intent to sell and whether it is more likely than not that the Company would be required to sell those securities before the anticipated recovery of the amortized cost basis, and 4) for debt securities, the recovery of contractual principal and interest.

For securities that the Company does not expect to sell, or it is not more likely than not it will be required to sell prior to recovery of its amortized cost basis, the credit component of an OTTI is recognized in earnings and the non-credit component is recognized in AOCI. For securities that the Company does expect to sell, or it is more likely than not that it will be required to sell prior to recovery of its amortized cost basis, both the credit and non-credit component of an OTTI are recognized in earnings. Subsequent to recognition of OTTI, an increase in expected cash flows is recognized as a yield adjustment over the remaining expected life of the security based on an evaluation of the nature of the increase.

Nonmarketable equity securities include stock acquired for regulatory purposes, such as Federal Home Loan Bank stock and Federal Reserve Bank stock. These securities are accounted for at amortized cost, evaluated for impairment at least quarterly, and included in "other assets".

Gains or losses on securities sold are recorded on the trade date, using the specific identification method.

Loans Held for Sale

LOANS HELD FOR SALE

Loans and loan commitments which the Company does not have the intent and ability to hold for the foreseeable future or until maturity or payoff are classified as loans held for sale at the time of origination or acquisition. Subsequent to origination or acquisition, if the Company no longer has the intent or ability to hold a loan for the foreseeable future, generally a decision has been made to sell the loan, and it is classified within loans held for sale. Unless the fair value option has been elected at origination or acquisition, loans classified as held for sale are carried at the lower of cost or fair value. Amortization/accretion of remaining unamortized net deferred loan fees or costs and discounts or premiums (if applicable) ceases when a loan is classified as held for sale.

Loans held for sale primarily consist of fixed rate single-family residential mortgage loans originated and under contract to be sold in the secondary market. Mortgage loans originated and held for sale are recorded at fair value under the fair value option, unless otherwise noted. For mortgage loans for which the Company has elected the fair value option, gains and losses are included in mortgage income. For any other loans held for sale, net unrealized losses, if any, are recognized through a valuation allowance that is recorded as a charge to non-interest income. See Note 20 for further discussion of the determination of fair value for loans held for sale. In most cases, loans in this category are sold within thirty days and are generally sold with the mortgage servicing rights released. Buyers generally have recourse to return a purchased loan or request reimbursement for the loan premium or servicing rights under limited circumstances. Recourse conditions may include prepayment, payment default, breach of representations or warranties, and documentation deficiencies. During 2015 and 2014, an insignificant number of loans were returned to the Company. At December 31, 2015 and 2014, the recorded repurchase liability associated with transferred loans was immaterial.

Loans

LOANS

Legacy (Loans originated by the Company)

The Company originates mortgage, commercial, and consumer loans for customers. Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the unpaid principal balances, less the ALL, charge-offs, and unamortized net loan origination fees and direct costs, except for loans which are carried at fair value. Interest income is accrued as earned over the term of the loans based on the principal balance outstanding. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield.

Acquired (Loans acquired through Business Combinations)

Acquired loans are recorded at fair value on the acquisition date in accordance with ASC Topic 820, Fair Value Measurement, consistent with the exit price concept on the date of acquisition. Credit risk assumptions and any resulting credit discounts are included in the determination of fair value. Therefore, an ACL is not recorded at the acquisition date. The determination of fair value includes estimates related to discount rates, expected prepayments, and the amount and timing of undiscounted expected principal, interest, and other cash flows.

Acquired loans are evaluated at acquisition and classified as purchased impaired (“acquired impaired”) or purchased non-impaired (“acquired non-impaired”). Purchased impaired loans reflect credit deterioration since origination to the extent that it is probable at the time of acquisition that the Company will be unable to collect all contractually required payments. At the time of acquisition, purchased impaired loans are accounted for individually or aggregated into loan pools with similar characteristics, which include:

• whether the loan is performing according to contractual terms at the time of acquisition,

• the loan type based on regulatory reporting guidelines, namely whether the loan was a mortgage, consumer, or commercial loan,

• the nature of collateral,

• the interest rate type, whether fixed or variable rate, and

• the loan payment type, primarily whether the loan is amortizing or interest-only.

From these pools, the Company uses certain loan information, including outstanding principal balance, estimated expected losses, weighted average maturity, weighted average term to re-price (if a variable rate loan), weighted average margin, and weighted average interest rate to estimate the expected cash flow for each loan pool.

For purchased impaired loans, expected cash flows at the acquisition date in excess of the fair value of loans are recorded as interest income over the life of the loans using a level yield method if the timing and amount of future cash flows is reasonably estimable. For purchased non-impaired loans, the difference between the fair value and unpaid principal balance of the loan at acquisition, referred to as a purchase premium or discount, is amortized or accreted to income over the estimated life of the loans as an adjustment to yield.

Subsequent to acquisition, the Company performs cash flow re-estimations at least quarterly for each purchased impaired loan and/or loan pool. Increases in estimated cash flows above those expected at acquisition are recognized on a prospective basis as interest income over the remaining life of the loan and/or pool. Decreases in expected cash flows subsequent to acquisition generally result in recognition of a provision for credit loss. The measurement of cash flows involves several assumptions and judgments (i.e., prepayments, default rates, loss severity, etc.). All of these factors are inherently subjective and significant changes in the cash flow estimations can result over the life of the loan.

Classification

The Company’s loan portfolio is disaggregated into portfolio segments for purposes of determining the ACL. The Company’s portfolio segments include commercial, residential mortgage, and consumer and other loans, bifurcated between legacy and acquired. The Company further disaggregates each commercial, residential mortgage, and consumer and other loans portfolio segment into classes for purposes of monitoring and assessing credit quality based on certain risk characteristics. Classes within the commercial loan portfolio segment include commercial real estate-construction, commercial real estate-other, commercial and industrial, and energy-related. Classes within the consumer and other loans portfolio segment include home equity, indirect automobile, credit card, and consumer-other.

Troubled Debt Restructurings

Troubled Debt Restructurings

The Company periodically grants concessions to its customers in an attempt to protect as much of its investment as possible and minimize risk of loss. These concessions may include restructuring the terms of a loan to alleviate the burden of the customer’s near-term cash requirements. In order to be classified a TDR, the Company must conclude that the restructuring constitutes a concession and the customer is experiencing financial difficulties. The Company defines a concession to the customer as a modification of existing terms for economic or legal reasons that it would otherwise not consider. The concession is either granted through an agreement with the customer or is imposed by a court or law. Concessions include modifying original loan terms to reduce or defer cash payments required as part of the loan agreement, including but not limited to:

• a reduction of the stated interest rate for the remaining original life of the loan,

• extension of the maturity date or dates at a stated interest rate lower than the current market rate for new loans with similar risk characteristics,

• reduction of the face amount or maturity amount of the loan as stated in the agreement, or

• reduction of accrued interest receivable on the loan.

In its determination of whether the customer is experiencing financial difficulties, the Company considers numerous indicators, including, but not limited to:

• whether the customer is currently in default on its existing loan(s), or is in an economic position where it is probable the customer will be in default on its loan(s) in the foreseeable future without a modification,

• whether the customer has declared or is in the process of declaring bankruptcy,

• whether there is substantial doubt about the customer’s ability to continue as a going concern,

• whether, based on its projections of the customer’s current capabilities, the Company believes the customer’s future cash flows will be insufficient to service the loan, including interest, in accordance with the contractual terms of the existing agreement for the foreseeable future, and

• whether, without modification, the customer cannot obtain sufficient funds from other sources at an effective interest rate equal to the current market rate for a similar loan for a non-troubled debtor.

If the Company concludes that both a concession has been granted and the customer is experiencing financial difficulties, the Company identifies the loan as a TDR. All TDRs are considered impaired loans.

Non-accrual and Past Due Loans (Including Loan Charge-offs)

NON-ACCRUAL AND PAST DUE LOANS (INCLUDING LOAN CHARGE-OFFS)

Loans are considered past due when contractual payments of principal and interest have not been received within 30 days from the contractual due date.

All legacy and purchased non-impaired loans are placed on non-accrual status when collection of principal or interest is in doubt. Purchased impaired loans are placed on non-accrual status when the Company cannot reasonably estimate cash flows on a loan or loan pool. Legacy and purchased non-impaired loans are evaluated for potential charge-off in accordance with the parameters discussed in the following paragraph or when the loan is placed on non-accrual status, whichever is earlier.

Loans within the commercial portfolio (except for purchased impaired) are generally evaluated for charge-off at 90 days past due, unless both well-secured and in the process of collection. Closed and open-end residential mortgage and consumer loans (except for purchased impaired) are evaluated for charge-off no later than 120 days past due. Any outstanding loan balance in excess of the fair value of the collateral less costs to sell is charged-off no later than 120 days past due for loans secured by real estate. For non-real estate secured loans, in lieu of charging off the entire loan balance, loans may be written down to the fair value of the collateral less costs to sell if repossession of collateral is assured and in process. 

The accrual of interest, as well as the amortization/accretion of any remaining unamortized net deferred fees or costs and discount or premium, is discontinued at the time the loan is placed on non-accrual status. All accrued but uncollected interest for loans that are placed on non-accrual status is reversed, with current year accruals charged to interest income and prior year amounts charged-off as a credit loss. Cash receipts received on non-accrual loans are generally applied against principal until the loan has been collected in full, after which time any additional cash receipts are recognized as interest income (i.e., cost recovery method). However, interest may be accounted for under the cash-basis method as long as the remaining recorded investment in the loan is deemed fully collectible.

Loans are returned to accrual status when the borrower has demonstrated a capacity to continue payment of the debt and collection of contractually required principal and interest associated with the debt is reasonably assured. At such time, the accrual of interest and amortization/accretion of any remaining unamortized net deferred fees or costs and discount or premium shall resume. Any interest income which was applied to the principal balance shall not be reversed and subsequently will be recognized as an adjustment to yield over the remaining life of the loan.

Impaired Loans

IMPAIRED LOANS

For all classes within the commercial portfolio, all loans with an outstanding commitment balance above a specific threshold are evaluated on a quarterly basis for potential impairment. Generally, mortgage and consumer loans within any class are not individually evaluated on a regular basis for impairment. All TDRs, regardless of the outstanding balance amount or portfolio classification, and all purchased impaired loans are considered to be impaired.

A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal and/or interest when due, according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Impairment losses are measured on a loan-by-loan basis for commercial and certain mortgage or consumer loans, based on either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent. This measurement requires significant judgment and use of estimates, and the actual loss ultimately recognized by the Company may differ significantly from the estimates.

Allowance For Credit Losses

ALLOWANCE FOR CREDIT LOSSES

The Company maintains the ACL at a level that management believes appropriate to absorb estimated probable credit losses incurred in the loan portfolios (including unfunded commitments) as of the consolidated balance sheet date. The ACL consists of the allowance for loan losses (contra asset) and the reserve for unfunded commitments (liability). The manner in which the ACL is determined is based on 1) the accounting method applied to the underlying loans and 2) whether the loan is required to be measured for impairment in accordance with ASC Topic 450-20, Contingencies - Loss Contingencies or ASC Topic 310-10-35, Receivables - Overall. The Company delineates between loans accounted for under the contractual yield method, legacy and purchased non-impaired loans, and purchased impaired loans (loans accounted for in accordance with ASC Topic 310-30, Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality). Further, for legacy and acquired non-impaired loans, the Company attributes portions of the ACL to loans and loan commitments that it measures individually (ASC Topic 310-10-35, Receivables - Overall), impaired credit, and groups of homogeneous loans and loan commitments that it measures collectively (ASC Topic 450-20, Contingencies - Loss Contingencies).

Determination of the appropriate ACL involves a high degree of complexity and requires significant judgment regarding the credit quality of the loan portfolio. Several factors are taken into consideration in the determination of the overall ACL, including a qualitative component. These factors include, but are not limited to, the overall risk profiles of the loan portfolios, net charge-off experience, the extent of impaired loans, the level of non-accrual loans, the level of 90 days past due loans, the value of collateral, the ability to monetize guarantor support, and the overall percentage level of the allowance relative to the loan portfolio, amongst other factors. The Company also considers overall asset quality trends, changes in lending practices and procedures, trends in the nature and volume of the loan portfolio, including the existence and effect of any portfolio concentrations, changes in experience and depth of lending staff, the Company’s legal, regulatory and competitive environment, national and regional economic trends, data availability and applicability that might impact the portfolio or the manner in which it estimates losses, and risk rating accuracy and risk identification.

The allowance for loan losses for all impaired loans (excluding purchased impaired) is determined on an individual loan basis, considering the facts and circumstances specific to each borrower. The allowance is based on the difference between the recorded investment in the loan and generally either the estimated net present value of projected cash flows or the estimated value of the collateral associated with the loan, if the loan is deemed collateral-dependent. For non-impaired loans (excluding purchased impaired), the allowance for loan losses is calculated based on pools of loans with similar characteristics. The pool level allowance is calculated through the application of a PD (i.e., probability of default) and LGD (i.e., loss given default) factor for each individual loan. PDs and LGDs are determined based on historical default and loss information for similar loans. For purposes of establishing estimated loss percentages for pools of loans that share common risk characteristics, the Company’s loan portfolio is segmented by various loan characteristics including loan type, risk rating (commercial), Vantage or FICO score (mortgage and consumer), past due status (mortgage and consumer) and call report code. The default and loss information is measured over an appropriate period for each loan pool and adjusted as deemed appropriate. Qualitative adjustments are incorporated into the pool level analysis to accommodate for the imprecision of certain assumptions and uncertainties inherent in the calculation. See the "Loans" section of this Footnote for discussion of the determination of the ACL for purchased impaired loans.

Certain inherent, but unconfirmed losses are probable within the loan portfolio. The Company’s current methodology for determining the level of losses is based on historical loss rates, current credit grades, specific allocation, and other qualitative adjustments. In a stable or deteriorating credit environment, heavy reliance on historical loss rates and the credit grade rating process results in model-derived required reserves that tend to slightly lag behind portfolio deterioration. Similar lags can occur in an improving credit environment whereby required reserves can lag slightly behind portfolio improvement. Given these model limitations, qualitative adjustment factors may be incremental or decremental to the quantitative model results. In periods prior to 2015, the Company estimated incurred losses on its Exploration and Production and its Oil Field Services portfolios as an aggregate portfolio. Beginning in 2015, as the performance of these two portfolios began to diverge, the Company disaggregated the analysis of incurred losses within these portfolios, which included modifying its LGD estimates for the E&P portfolio to more closely align with published industry data. Absent this change, the Company would have recorded an additional $10.0 million, or 17 cents per share, in provision expense for the year ended December 31, 2015. 

The reserve for unfunded commitments is determined using similar methodologies described above for non-impaired loans. The loss factors used in the reserve for unfunded commitments are equivalent to the loss factors used in the allowance for loan losses, while also considering utilization of unused commitments.

FDIC Loss Share Receivable

FDIC LOSS SHARE RECEIVABLE

The Company entered into arrangements with the FDIC which obligate the FDIC to reimburse the Company for losses on certain loans associated with FDIC-assisted transactions. The indemnification assets were recorded at fair value as of the acquisition dates. The initial values of the indemnification assets were based on estimated cash flows to be received over the expected life of the acquired assets, not to exceed the term of the indemnification agreements. The reimbursable loss periods, excluding single family residential assets, ended in 2014 for three acquisitions, ended during 2015 for one acquisition, and will end during 2016 for two acquisitions. The reimbursable loss periods for single family residential assets will end in 2019 for three acquisitions, in 2020 for one acquisition, and in 2021 for two acquisitions. Assets are covered through expiration of the loss share term, at which point such assets are considered non-covered.

Because the indemnification assets are measured on the same basis as the indemnified (covered) loans, subject to contractual and collectibility limitations, the indemnification assets are impacted by changes in expected cash flows on covered assets. Increases in credit losses expected to occur within the loss share term are generally recorded as current period increases to the ACL and increase the amount collectible from the FDIC by the applicable loss share percentage. Decreases in credit losses expected to occur within the loss share term reduce the amount collectible from the FDIC and increase the amount collectible from customers in the form of prospective accretion on loans. Increases in the portion of indemnification asset collectible from customers are amortized to income. Periodic amortization represents the amount that is expected to result in symmetrical recognition of pool-level accretion and amortization over the shorter of 1) the life of the loan or 2) the life of the shared loss agreement.

The Company assesses the indemnification assets for collectibility at the acquisition level based on three sources: 1) the FDIC, 2) OREO transactions, and 3) customers. Amounts collectible from the FDIC through loss reimbursements are comprised of losses currently expected within the loss share term. A current period impairment would be recorded to the extent that events or circumstances indicate that losses previously expected to occur within the loss share term are expected to occur subsequent to loss share termination. Amounts collectible through expected gains on the sale of OREO are written-up or impaired each period based on the best available information.

Loss assumptions used to measure the basis of the indemnified loans are consistent with the loss assumptions used to measure the indemnification assets.

Premises and Equipment, and Software

PREMISES AND EQUIPMENT

Land is carried at cost. Buildings, furniture, fixtures, and equipment are carried at cost, less accumulated depreciation computed on a straight-line basis over the estimated useful lives of 10 to 40 years for buildings and 3 to 15 years for furniture, fixtures, and equipment. Leasehold improvements are amortized over the lease term, including any renewal periods that are reasonably assured, or the asset’s useful life, whichever is shorter. Premises and equipment are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.

SOFTWARE

Software is amortized on a straight-line basis over its estimated useful life. The estimated useful life of software is generally three years, but can vary depending on the specific facts and circumstances. Software is evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the software may not be recoverable. Software is recorded within "other assets" on the Company’s consolidated balance sheets with carrying amounts at December 31, 2015 and 2014 of $6.2 million and $7.9 million, respectively.

Goodwill and Other Intangible Assets

GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

Goodwill represents the excess of the consideration paid in a business combination over the fair value of the identifiable net assets acquired. Goodwill is not amortized, but is assessed for potential impairment at a reporting unit level on an annual basis, as of October 1^st, or whenever events or changes in circumstances indicate that it is more likely than not the fair value of a reporting unit is less than its respective carrying amount. As part of its testing, the Company may elect to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the results of the qualitative assessment indicate that more likely than not a reporting unit’s fair value is less than its carrying amount, the Company determines the fair value of the respective reporting unit (through the application of various quantitative valuation methodologies) relative to its carrying amount to determine whether quantitative indicators of potential impairment are present (i.e., Step 1). The Company may also elect to bypass the qualitative assessment and begin with Step 1. If the results of Step 1 indicate that the fair value of the reporting unit may be below its carrying amount, the Company determines the fair value of the reporting unit’s assets and liabilities, considering deferred taxes, and then measures impairment loss by comparing the implied fair value of goodwill with the carrying amount of that goodwill (i.e., Step 2).

Title Plant

Costs incurred to construct a title plant, including the costs incurred to obtain, organize, and summarize historical information, are capitalized until the title plant can be used to perform title searches. A purchased title plant, including a purchased undivided interest in a title plant, is recorded at cost at the date of acquisition. For a title plant acquired separately or as part of a company acquisition, cost is measured as the fair value of the consideration given. Capitalized costs of a title plant are not depreciated or charged to income unless circumstances indicate that the carrying amount of the title plant has been impaired. Impairment indicators include a change in legal requirements or statutory practices, identification of obsolescence, or abandonment of the title plant, among other indicators.

Capitalized storage and retrieval costs (e.g., costs to convert from one storage retrieval system to another or to modernize the storage and retrieval systems) incurred after a title plant is operational are charged to expense in a systematic and rational manner. Title plant is recorded within "other assets" on the Company’s consolidated balance sheets.

Intangible assets subject to amortization

The Company’s acquired intangible assets that are subject to amortization include (amongst other ancillary intangibles described in Note 10) core deposit intangibles, amortized on a straight-line or accelerated basis, and a customer relationship intangible asset, amortized on an accelerated basis, over average lives not to exceed 10 years. The Company reviews intangible assets for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Impairment is identified if the sum of the undiscounted estimated future cash flows is less than the carrying value of the asset.Intangible assets are recorded within "other assets" on the Company’s consolidated balance sheets.

Other Real Estate

OTHER REAL ESTATE OWNED

Other real estate owned includes all real estate, other than bank premises used in bank operations, owned or controlled by the Company, including real estate acquired in settlement of loans. Properties are initially recognized at the recorded investment of the loan (which is the pro-rata carrying value of loans accounted for in accordance with ASC Topic 310-30, Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality) or at estimated fair value less costs to sell, whichever is less, generally when the Company has received physical possession (legal title is not required for non-consumer residential property). The amount by which the recorded investment of the loan exceeds the fair value less costs to sell of the property is charged to the ALL. Subsequent to foreclosure, the assets are carried at the lower of cost or fair value less costs to sell. Former bank properties transferred to OREO are recorded at the lower of cost or market. Subsequent declines in the fair value of other real estate are recorded as adjustments to the carrying amount through a valuation allowance. Revenue and expenses from operations, gain or loss on sale, and changes in the valuation allowance are included in net expenses from foreclosed assets. The Company included property write-downs of $4.0 million and $3.8 million in earnings for the years ended December 31, 2015 and 2014, respectively. OREO is recorded within "other assets" on the Company’s consolidated balance sheets.

Derivative Financial Instruments

DERIVATIVE FINANCIAL INSTRUMENTS

The Company enters into various derivative financial instruments to manage interest rate risk, asset sensitivity, and other exposures such as liquidity and credit risk, as well as to facilitate customer transactions. The primary types of derivatives utilized by the Company include interest rate swap agreements, interest rate lock commitments, forward sales commitments, and written and purchased options. All derivative instruments are recognized on the consolidated balance sheets as "other assets" or "other liabilities" at fair value, regardless of whether a right of offset exists. Changes in the fair value (i.e., gains or losses) of a derivative instrument are recorded based on whether it has been designated and qualifies as part of a hedging relationship.

To facilitate customer transactions that are entered outside of the Company's risk management strategies, the Company enters into derivative instruments to allow its commercial customers to manage their exposure to interest rate fluctuations or to facilitate business transactions. These derivative instruments, including interest rate swap agreements and foreign exchange contracts, are not designated for hedge accounting (i.e., economic hedges). To mitigate the market risk associated with these customer contracts, the Company enters into offsetting derivative contract positions. The Company manages its credit risk, or potential risk of default, by its commercial customers through credit limit approval and monitoring procedures.

Derivatives Designated in Hedging Relationships

For cash flow hedges, the effective portion of the gain or loss related to the derivative instrument is initially reported as a component of OCI and subsequently reclassified into earnings when the forecasted transaction affects earnings or when the hedge is terminated. The ineffective portion of the gain or loss, if any, is reported in earnings immediately, in either "other income" or "other expense", respectively. In applying hedge accounting for derivatives (ASC Topic 815-30 Derivatives and Hedging - Cash Flow Hedges), the Company establishes and documents a method for assessing the effectiveness of the hedging derivative and a measurement approach for determining the ineffective aspect of the hedge upon the inception of the hedge.

Derivatives Not Designated in Hedging Relationships

For derivative instruments that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately.

Common Types of Derivatives

Interest rate swap agreements

Interest rate swaps are agreements to exchange interest payments based upon notional amounts. The exchange of payments typically involves paying a fixed rate and receiving a variable rate or vice versa.

As part of its activities to manage interest rate risk (i.e., the exposure to the variability of future cash flows or other forecasted transactions due to fluctuating market rates), the Company enters into interest rate contracts, which typically include interest rate swap agreements. The Company primarily utilizes these instruments, which the Company designates as cash flow hedges, to convert a portion of its variable-rate loans or debt to a fixed rate.

Interest rate lock commitments

The Company enters into commitments to originate mortgage loans intended for sale whereby the interest rate on the prospective loan is determined prior to funding (“rate lock”). A rate lock is provided to a borrower, subject to conditional performance obligations, for a specified period of time that typically does not exceed 60 days. Rate lock commitments on mortgage loans that are intended to be sold are recognized as derivatives. Accordingly, such commitments are recorded at fair value as derivative assets or liabilities, with changes in fair value recorded in mortgage income on the consolidated statements of comprehensive income.

Forward sales commitments

The Company uses forward sales commitments to protect the value of its rate locks and mortgage loans held for sale from changes in interest rates and pricing between the origination of the rate lock and sale of these loans, as changes in interest rates have the potential to cause a decline in value of rate locks and mortgage loans included in the held for sale portfolio. These commitments are recognized as derivatives and recorded at fair value as derivative assets or liabilities, with changes in fair value recorded in mortgage income on the consolidated statements of comprehensive income.

Equity-indexed certificates of deposit

IBERIABANK offers its customers a certificate of deposit that provides the purchaser a guaranteed return of principal at maturity plus a potential return, which allows IBERIABANK to identify a known cost of funds. The rate of return is based on the performance of a group of publicly traded stocks that represent a variety of industry segments. Because it is based on an equity index, the rate of return represents an embedded derivative that is not clearly and closely related to the host instrument and is to be accounted for separately. Accordingly, the certificate of deposit is separated into two components: a zero coupon certificate of deposit (the host instrument) and a written option purchased by the depositor (an embedded derivative). The discount on the zero coupon deposit is amortized over the life of the deposit, and the written option is carried at fair value on the Company’s consolidated balance sheets, with changes in fair value recorded through earnings. IBERIABANK offsets the risks of the written option by purchasing an option with terms that mirror the written option, which is also carried at fair value on the Company’s consolidated balance sheets.

Off-Balance Sheet Credit-Related Financial Instruments

OFF-BALANCE SHEET CREDIT-RELATED FINANCIAL INSTRUMENTS

In the ordinary course of business, the Company executes various commitments to extend credit, including commitments under commercial construction arrangements, commercial and home equity lines of credit, credit card arrangements, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded on the funding date.

Transfers of Financial Assets

TRANSFERS OF FINANCIAL ASSETS

Transfers of financial assets, or portions thereof which meet the definition of a participating interest, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when 1) the assets have been legally isolated from the Company, 2) the transferee obtains the right, free of conditions that constrain it from taking advantage of that right and provide the Company with more than a trivial benefit, to pledge or exchange the transferred assets, and 3) the Company does not maintain effective control over the transferred assets. Should the transfer not satisfy all three criteria, the transaction is recorded as a secured financing.

If the transfer is accounted for as a sale, the transferred assets are derecognized from the Company’s balance sheet and a gain or loss on sale is recognized. If the transfer is accounted for as a secured borrowing, the transferred assets remain on the Company’s balance sheet and the proceeds from the transaction are recognized as a liability.

Mortgage Servicing Rights

The Company recognizes the rights to service mortgage loans as separate assets, which are recorded in "other assets" in the consolidated balance sheets, when purchased or when servicing is contractually separated from the underlying mortgage loans by sale with servicing rights retained.

For loan sales with servicing retained, a servicing right (generally an asset) is recorded at fair value for the right to service the loans sold. All servicing rights are identified by class and subsequently accounted for under the amortization method.

Income Taxes

INCOME TAXES

The Company and all subsidiaries file a consolidated Federal income tax return on a calendar year basis. The Company files income tax returns in the U.S. Federal jurisdiction and various state and local jurisdictions through IBERIABANK Corporation (Parent), IBERIABANK, IMC, LTC, and their subsidiaries. In lieu of Louisiana state income tax, IBERIABANK is subject to the Louisiana bank shares tax, portions of which are included in both "non-interest expense" and "income tax expense" in the Company’s consolidated statements of comprehensive income. With few exceptions, the Company is no longer subject to U.S. federal, state or local income tax examinations for years before 2011.

Deferred income tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the temporary differences between the book and tax bases of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. The measurement of deferred tax assets is reduced, if necessary, by the amount of any tax benefits that, based on available evidence, are not expected to be realized.

The Company recognizes interest and penalties accrued related to unrecognized tax benefits, if applicable, in "non-interest expense".

Share-based Compensation Plans

SHARE-BASED COMPENSATION PLANS

The Company issues stock options, restricted stock awards, restricted share units, performance units, and phantom awards under various plans to directors, officers, and other key employees. Compensation cost for all awards is recognized on a straight-line basis over the requisite service period, which is generally the vesting period, taking into account retirement eligibility. For service awards with graded vesting, the Company recognizes compensation cost on a straight-line basis. The majority of the Company's share-based awards qualify for equity accounting and contain service conditions. Under equity accounting, the fair value of the award is measured at the grant date and not subsequently remeasured.

In accordance with ASC 718 Compensation - Stock Compensation, for awards that contain a market condition, the Company includes the market condition in the determination of the grant date fair value of the award. Compensation cost for an award with a market condition is recognized regardless of whether the market condition is satisfied, assuming the requisite service is met. The Company does not include performance conditions in the determination of the grant date fair value of the award. Compensation cost for an award with a performance condition is not recognized if the performance condition is not satisfied. Phantom awards and performance units, accounted for as liability awards, are remeasured at each reporting period based on their fair value until the date of settlement. Compensation cost for each reporting period until settlement is based on the change (or a portion of the change, depending on the percentage of the requisite service that has been rendered at the reporting date) in the fair value of the phantom award and performance unit for each reporting period.

Compensation expense relating to share-based awards is recognized in net income as part of “salaries and employee benefits” on the consolidated statements of comprehensive income for employees and “professional services” for non-employee directors. The exercise price for the options granted by the Company is not less than the fair market value of the underlying stock at the grant date.

Earnings Per Common Share

EARNINGS PER COMMON SHARE

Basic earnings per share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflects additional common shares that would have been outstanding if dilutive potential common shares, in the form of stock options or restricted stock units, had been issued, as well as any adjustment to income that would result from the assumed issuance. Participating common shares issued by the Company relate to unvested outstanding restricted stock awards, the earnings allocated to which are used in determining income available to common shareholders under the two-class method. The two-class method allocates earnings for the period between common shareholders and other participating securities holders. The participating awards receiving dividends are allocated the same percentage of income as if they were outstanding shares.

Share Repurchases

SHARE REPURCHASES

Repurchases of the Company’s common stock are recorded at cost.

Effective January 1, 2015, companies incorporated in Louisiana became subject to the Louisiana Business Corporation Act (which replaced the Louisiana Business Corporation Law). Provisions of the Louisiana Business Corporation Act eliminated the concept of treasury stock and provide that shares reacquired by a company are to be treated as authorized but unissued shares. As a result of this change in law, for the consolidated financial statements beginning with the quarterly period ended March 31, 2015, the Company classifies shares previously classified as treasury stock as a reduction to issued shares of common stock, and accordingly, adjusts the stated value of common stock and paid-in-capital.

Comprehensive Income

COMPREHENSIVE INCOME

Accounting principles generally require that recognized revenue, expenses, gains, and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities and cash flow hedges, are reported as a separate component of the shareholders’ equity section of the consolidated balance sheets, such items, along with net income, are components of comprehensive income.

Fair Value Measurements

FAIR VALUE MEASUREMENTS

Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company estimates fair value based on the assumptions market participants would use when selling an asset or transferring a liability and characterizes such measurements within the fair value hierarchy based on the inputs used to develop those assumptions and measure fair value. The hierarchy requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:

• Level 1 - Quoted prices in active markets for identical assets or liabilities.

• Level 2 - Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

• Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies, and similar techniques that use significant unobservable inputs.

A description of the valuation methodologies used for instruments measured at fair value follows, as well as the classification of such instruments within the valuation hierarchy. The descriptions below are exclusive of assets or liabilities acquired in business combinations, as all such instruments are required to initially be measured at fair value.

Cash and cash equivalents

The carrying amounts of cash and cash equivalents approximate their fair value.

Investment securities

Securities are classified within Level 1 where quoted market prices are available in an active market. Inputs include securities that have quoted prices in active markets for identical assets. If quoted market prices are unavailable, fair value is estimated using quoted prices of securities with similar characteristics, at which point the securities are classified within Level 2 of the hierarchy.

Mortgage loans held for sale

Mortgage loans originated and held for sale are recorded at fair value under the fair value option, unless otherwise noted. When determining the fair value of loans held for sale, the Company obtains quotes or bids on these loans directly from the purchasing financial institutions (Level 2).

Loans

The fair values of non-covered mortgage loans are estimated based on present values using entry-value rates (the interest rate that would be charged for a similar loan to a borrower with similar risk at the indicated balance sheet date) at December 31, 2015 and 2014, weighted for varying maturity dates. Other non-covered loans are valued based on present values using entry-value interest rates at December 31, 2015 and 2014 applicable to each category of loans, which are classified within Level 3 of the hierarchy. Covered loans are measured using projections of expected cash flows, exclusive of the loss sharing agreements with the FDIC. Fair value of the covered loans reflects the current fair value of these loans, which is based on an updated estimate of the projected cash flow as of the dates indicated. The fair value associated with the loans includes estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows, which also are classified within Level 3 of the hierarchy.

Impaired loans

Loans are measured for impairment using the methods permitted by ASC Topic 310, Receivables. Fair value measurements are used in determining impairment using either the loan’s observable market price (Level 1), if available, or the fair value of the collateral, if the loan is collateral dependent (Level 2). Measuring the impairment of loans using the present value of expected future cash flows, discounted at the loan’s effective interest rate, is not considered a fair value measurement. Fair value of the collateral is determined by appraisals or independent valuation.

FDIC Loss Share Receivables

The fair value of FDIC loss share receivables are determined using projected cash flows from loss sharing agreements based on expected reimbursements for losses at the applicable loss sharing percentages based on the terms of the loss share agreements. Cash flows are discounted to reflect the timing and receipt of the loss sharing reimbursements from the FDIC. The fair value of the Company’s FDIC loss share receivables are categorized within Level 3 of the hierarchy.

Other real estate owned

Fair values of OREO are determined by sales agreement or appraisal and costs to sell are based on estimation per the terms and conditions of the sales agreement or amounts commonly used in real estate transactions. Inputs include appraisal values on the properties or recent sales activity for similar assets in the property’s market, and thus OREO measured at fair value is classified within Level 2 of the hierarchy.

Derivative financial instruments

Fair values of interest rate swaps, interest rate locks, forward sales commitments, and written and purchased options are estimated using prices of financial instruments with similar characteristics and thus are classified within Level 2 of the fair value hierarchy.

Deposits

The fair values of NOW accounts, money market deposits and savings accounts are the amounts payable on demand at the reporting date. Certificates of deposit are valued using a discounted cash flow model based on the weighted-average rate at December 31, 2015 and 2014 for deposits with similar remaining maturities. The fair value of the Company’s deposits are categorized within Level 3 of the fair value hierarchy.

Short-term borrowings

The carrying amounts of short-term borrowings maturing within ninety days approximate their fair values.

Long-term debt

The fair values of long-term debt are estimated using discounted cash flow analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. The fair value of the Company’s long-term debt is categorized within Level 3 of the fair value hierarchy.

Off-balance sheet items

The Company has outstanding commitments to extend credit and standby letters of credit. These off-balance sheet financial instruments are generally exercisable at the market rate prevailing at the date the underlying transaction will be completed. At December 31, 2015 and 2014, the fair value of guarantees under commercial and standby letters of credit was immaterial.

Recent Accounting Pronouncements

ASU No. 2014-01

In January 2014, the FASB issued ASU No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). The ASU allows for use of the proportional amortization method for investments in qualified affordable housing projects, if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized in the consolidated statements of comprehensive income as a component of income tax expense. The ASU provides for a practical expedient, which allows for amortization of the investment in proportion to only the tax credits if it produces a measurement that is substantially similar to the measurement that would result from using both tax credits and other tax benefits.

The ASU was effective for fiscal years and interim periods beginning after December 15, 2014. The Company adopted this guidance effective January 1, 2015, utilizing the practical expedient method. Amortization expense related to qualified affordable housing investments has been presented net of the income tax credits in "income tax expense" in the consolidated statements of comprehensive income. The standard was required to be applied retrospectively; therefore, prior periods have been restated in accordance with GAAP. The impact of the adoption of ASU 2014-01 was not material to the consolidated financial statements in current or prior periods.

ASU No. 2014-09 and 2015-14

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which implements a common revenue standard and clarifies the principles used for recognizing revenue. The amendments in the ASU clarify that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. As part of that principle, the entity should identify the contract(s) with the customer, identify the performance obligation(s) of the contract, determine the transaction price, allocate that transaction price to the performance obligation(s) of the contract, and then recognize revenue when or as the entity satisfies the performance obligation(s).

In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date, which deferred the original effective date declared in ASU No. 2014-09 by one year. Accordingly, the amendments in ASU No. 2014-09 will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that annual reporting period. The amendments will be applied through the election of one of two retrospective methods.The Company is currently assessing the effect, but does not expect the adoption will have a significant impact on the Company’s consolidated financial statements.

ASU No. 2015-02

In February 2015, the FASB issued ASU No. 2015-02, Consolidation - Amendments to the Consolidation Analysis, which changes the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The amendments in the guidance: 1) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, 2) eliminate the presumption that a general partner should consolidate a limited partnership, 3) affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, and 4) provide a scope exception from consolidation guidance for certain investment funds.

ASU No. 2015-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The guidance may be applied using a modified retrospective approach by recording a cumulative effect adjustment to equity as of the beginning of the fiscal year of adoption. The amendments may also be applied retrospectively. The Company does not believe the adoption of the ASU will have a significant impact on the Company’s consolidated financial statements.

ASU No. 2015-03

In April 2015, the FASB issued ASU No. 2015-03, Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs, in an effort to comply with its simplification initiative to reduce complexity in accounting standards. ASU No. 2015-03 requires debt issuance costs related to a debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the debt liability. ASU No. 2015-03 does not affect recognition and measurement guidance for debt issuance costs.

ASU No. 2015-03 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The amendment will be applied retrospectively. The adoption of this ASU will not have a significant impact on the Company's consolidated financial statements.

ASU No. 2015-05

In April 2015, the FASB issued ASU No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement, which provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The determination of whether an arrangement contains a software license may impact the classification of the costs associated with the arrangement and the reporting period in which the costs are recognized as expense.

The amendments will be effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. The Company has determined it will elect to adopt the amendments prospectively to all arrangements entered into or materially modified beginning January 1, 2016. The amendments will be applied prospectively on an individual arrangement basis and the impact to the Company’s consolidated financial statements will vary depending on the terms and conditions of the individual arrangement.

ASU No. 2015-16

In September 2015, the FASB issued ASU No. 2015-16, Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments. ASU No. 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined and present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current period earnings by line item that would have been have been recorded in previous reporting periods if the adjustment had been recognized as of the acquisition date.

ASU No. 2015-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The guidance must be applied prospectively for adjustments to provisional amounts that occur after the effective date of this update with earlier application permitted for financial statements that have not been issued. The Company adopted this guidance effective September 30, 2015. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

ASU No. 2016-01

In January 2016, the FASB issued ASU No. 2016-01, Financial Statements - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments will not change the guidance for classifying and measuring investments in debt securities or loans; however, the significant amendments will include changes related to how entities measure certain equity investments, recognize changes in the fair value of financial liabilities measured under the fair value option that are attributable to instrument-specific credit risk, and disclose and present financial assets and liabilities on the Company’s consolidated financial statements.

Specifically, the aforementioned amendments will require measurement of equity investments at fair value, with changes recognized in net income, unless the investments qualify for the new practicability exception, the equity method of accounting, or consolidation. For financial liabilities measured using the fair value option, any change in fair value caused by a change in an entity’s own credit risk will be recognized separately in OCI, as opposed to earnings. The amendments will also require entities to present financial assets and financial liabilities separately, grouped by measurement category and form of financial asset in the statement of financial position or in the accompanying notes to the financial statements. Entities will also no longer have to disclose the methods and significant assumptions for financial instruments measured at amortized cost, but will be required to measure such instruments under the “exit price” notion for disclosure purposes.

ASU No. 2016-01 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. An entity will record a cumulative-effect adjustment to beginning retained earnings as of the beginning of the first reporting period in which the guidance is adopted, with two exceptions. The amendments related to equity investments without readily determinable fair values (including disclosure requirements) will be effective prospectively. The requirement to use the exit price notion to measure the fair value of financial instruments for disclosure purposes will also be applied prospectively. The Company is currently evaluating the impact of the ASU on the Company’s consolidated financial statements.

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Acquisition Activity (Tables)

12 Months Ended

Dec. 31, 2015

Business Acquisition

Schedule of Business Acquisitions

During 2014, the Company completed the acquisitions of Trust-One Memphis, Teche and First Private. The following table summarizes consideration paid, net assets acquired and goodwill recognized.

(Dollars in thousands)	Consideration Paid		Net Assets Acquired			Goodwill Recognized
Trust One Bank - Memphis Operations	$	—	$	(8,596	)	$	8,596
Teche Holding Company	156,740		76,311			80,429
First Private Holdings, Inc.	58,640		32,387			26,253

Pro Forma Information

The following unaudited pro forma information for the years ended December 31, 2014 and 2013 reflect the Company’s estimated consolidated results of operations as if the acquisitions of Florida Bank Group, Old Florida, and Georgia Commerce occurred at January 1, 2014, unadjusted for potential cost savings and preliminary purchase price adjustments.

(Dollars in thousands, except per share data)	2014		2013
Interest and non-interest income	$	803,722	$	699,308
Net income	172,554		69,625
Earnings per share - basic	4.39		1.88
Earnings per share - diluted	4.38		1.88

Florida Bank Group, Inc.

Business Acquisition

Schedule of Business Acquisitions

The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	752,493	$	47,497
Total equity consideration		47,497
Non-Equity consideration
Cash		42,988
Total consideration paid		90,485
Fair value of net assets assumed including identifiable intangible assets		74,781
Goodwill		$	15,704

Schedule of Assets Acquired and Liabilities Assumed

The acquired assets and liabilities, as well as the preliminary adjustments to record those assets and liabilities at their estimated fair values, are presented in the following tables.

Florida Bank Group	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	72,982	$	—			$	72,982
Investment securities	107,236		136			(1)	107,372
Loans	312,902		(5,371		)	(2)	307,531
Other real estate owned	498		(75		)	(3)	423
Core deposit intangible	—		4,489			(4)	4,489
Deferred tax asset, net	19,889		8,569			(5)	28,458
Other assets	29,817		(8,949		)	(6)	20,868
Total Assets	$	543,324	$	(1,201	)		$	542,123
Liabilities
Interest-bearing deposits	$	282,417	$	263		(7)	$	282,680
Non-interest-bearing deposits	109,548		—				109,548
Borrowings	60,000		8,598			(8)	68,598
Other liabilities	1,898		4,618			(9)	6,516
Total Liabilities	$	453,863	$	13,479			$	467,342

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Florida Bank Group’s investments to their estimated fair values on the date of acquisition.

(2) The amount represents the adjustment of the book value of Florida Bank Group's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(3) The adjustment represents the adjustment of Florida Bank Group's OREO to its estimated fair value less costs to sell on the date of acquisition.

(4) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(5) The amount represents the net deferred tax asset recognized on the fair value adjustments of Florida Bank Group acquired assets and assumed liabilities.

(6) The amount represents the adjustment of the book value of Florida Bank Group’s property, equipment, and other assets to their estimated fair values at the acquisition date based on their appraised value.

(7) The amount represents the adjustment of the book value of Florida Bank Group's time deposits to their estimated fair values at the date of acquisition.

(8) The amount represents the adjustment of the book value of Florida Bank Group’s borrowings to their estimated fair value based on current interest rates and the credit characteristics inherent in the liability.

(9) The amount is necessary to record Florida Bank Group's rent liability at fair value.

Old Florida Bancshares, Inc.

Business Acquisition

Schedule of Business Acquisitions

The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	3,839,554	$	242,007
Total equity consideration		242,007
Non-Equity consideration
Cash		11,145
Total consideration paid		253,152
Fair value of net assets assumed including identifiable intangible assets		153,514
Goodwill		$	99,638

Schedule of Assets Acquired and Liabilities Assumed

Old Florida	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	360,688	$	—			$	360,688
Investment securities	67,209		—				67,209
Loans held for sale	5,952		—				5,952
Loans	1,073,773		(10,822		)	(1)	1,062,951
Other real estate owned	4,515		1,449			(2)	5,964
Core deposit intangible	—		6,821			(3)	6,821
Deferred tax asset, net	10,629		4,388			(4)	15,017
Other assets	30,549		(7,238		)	(5)	23,311
Total Assets	$	1,553,315	$	(5,402	)		$	1,547,913
Liabilities
Interest-bearing deposits	$	1,048,765	$	123		(6)	$	1,048,888
Non-interest-bearing deposits	340,869		—				340,869
Borrowings	1,528		—				1,528
Other liabilities	3,038		76			(7)	3,114
Total Liabilities	$	1,394,200	$	199			$	1,394,399

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Old Florida's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(2) The adjustment represents the adjustment of Old Florida's OREO to its estimated fair value less costs to sell on the date of acquisition.

(3) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(4) The amount represents the net deferred tax asset recognized on the fair value adjustments of Old Florida acquired assets and assumed liabilities.

(5) The amount represents the adjustment of the book value of Old Florida’s property, equipment, and other assets to their estimated fair values at the acquisition date based on their appraised value.

(6) The amount represents the adjustment of the book value of Old Florida's time deposits to their estimated fair values on the date of acquisition.

(7) The adjustment is necessary to record Old Florida's rent liability at fair value.

Georgia Commerce Bancshares Inc.

Business Acquisition

Schedule of Business Acquisitions

The following summarizes consideration paid and a preliminary allocation of purchase price to net assets acquired.

(Dollars in thousands)	Number of Shares	Amount
Equity consideration
Common stock issued	2,882,357	$	185,249
Total equity consideration		185,249
Non-Equity consideration
Cash		5,015
Total consideration paid		190,264
Fair value of net assets assumed including identifiable intangible assets		102,945
Goodwill		$	87,319

Schedule of Assets Acquired and Liabilities Assumed

Georgia Commerce	As Acquired		Preliminary Fair Value Adjustments				As recorded by the Company
(Dollars in thousands)
Assets
Cash and cash equivalents	$	51,059	$	—			$	51,059
Investment securities	135,710		(806		)	(1)	134,904
Loans held for sale	1,249		—				1,249
Loans	807,726		(15,606		)	(2)	792,120
Other real estate owned	9,795		(4,207		)	(3)	5,588
Core deposit intangible	—		6,720			(4)	6,720
Deferred tax asset, net	5,031		5,451			(5)	10,482
Other assets	28,952		(657		)	(6)	28,295
Total Assets	$	1,039,522	$	(9,105	)		$	1,030,417
Liabilities
Interest-bearing deposits	$	658,133	$	176		(7)	$	658,309
Non-interest-bearing deposits	249,739		—				249,739
Borrowings	13,203		—				13,203
Other liabilities	6,221		—				6,221
Total Liabilities	$	927,296	$	176			$	927,472

Explanation of certain fair value adjustments:

(1) The amount represents the adjustment of the book value of Georgia Commerce’s investments to their estimated fair values on the date of acquisition.

(2) The amount represents the adjustment of the book value of Georgia Commerce's loans to their estimated fair values based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio.

(3) The adjustment represents the adjustment of Georgia Commerce's OREO to its estimated fair value less costs to sell on the date of acquisition.

(4) The amount represents the fair value of the core deposit intangible asset created in the acquisition.

(5) The amount represents the net deferred tax asset recognized on the fair value adjustments of Georgia Commerce acquired assets and assumed liabilities.

(6) The amount represents the adjustment of the book value of Georgia Commerce’s property, equipment, and other assets to their estimated fair value at the acquisition date based on their appraised value.

(7) The amount represents the adjustment of the book value of Georgia Commerce's time deposits to their estimated fair values at the date of acquisition.

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Investment Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities

The amortized cost and fair values of investment securities, with gross unrealized gains and losses, consist of the following:

	December 31, 2015
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	252,514	$	1,161	$	(1,592	)	$	252,083
Obligations of state and political subdivisions	182,541		5,429		(9		)	187,961
Mortgage-backed securities	2,272,879		8,457		(16,523		)	2,264,813
Other securities	95,496		430		(497		)	95,429
Total securities available for sale	$	2,803,430	$	15,477	$	(18,621	)	$	2,800,286
Securities held to maturity:
Obligations of state and political subdivisions	$	69,979	$	2,803	$	(101	)	$	72,681
Mortgage-backed securities	28,949		107		(776		)	28,280
Total securities held to maturity	$	98,928	$	2,910	$	(877	)	$	100,961

	December 31, 2014
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	317,386	$	1,700	$	(3,533	)	$	315,553
Obligations of state and political subdivisions	86,513		3,679		(2		)	90,190
Mortgage-backed securities	1,741,917		16,882		(7,184		)	1,751,615
Other securities	1,460		35		—			1,495
Total securities available for sale	$	2,147,276	$	22,296	$	(10,719	)	$	2,158,853
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	10,000	$	88	$	—		$	10,088
Obligations of state and political subdivisions	77,597		3,153		(145		)	80,605
Mortgage-backed securities	29,363		151		(726		)	28,788
Total securities held to maturity	$	116,960	$	3,392	$	(871	)	$	119,481

Information pertaining to securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, is as follows:

	December 31, 2015
	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(1,214	)	$	177,839	$	(378	)	$	28,116	$	(1,592	)	$	205,955
Obligations of state and political subdivisions	(9		)	5,765		—			—		(9		)	5,765
Mortgage-backed securities	(11,737		)	1,279,914		(4,786		)	185,215		(16,523		)	1,465,129
Other securities	(488		)	51,975		(9		)	499		(497		)	52,474
Total securities available for sale	$	(13,448	)	$	1,515,493	$	(5,173	)	$	213,830	$	(18,621	)	$	1,729,323
Securities held to maturity:
Obligations of state and political subdivisions	$	(9	)	$	1,999	$	(92	)	$	4,162	$	(101	)	$	6,161
Mortgage-backed securities	(45		)	3,530		(731		)	17,573		(776		)	21,103
Total securities held to maturity	$	(54	)	$	5,529	$	(823	)	$	21,735	$	(877	)	$	27,264

	December 31, 2014
	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	—		$	—	$	(3,533	)	$	240,498	$	(3,533	)	$	240,498
Obligations of state and political subdivisions	(2		)	185		—			—		(2		)	185
Mortgage-backed securities	(1,189		)	304,686		(5,995		)	294,549		(7,184		)	599,235
Total securities available for sale	$	(1,191	)	$	304,871	$	(9,528	)	$	535,047	$	(10,719	)	$	839,918
Securities held to maturity:
Obligations of state and political subdivisions	$	(9	)	$	2,287	$	(136	)	$	8,590	$	(145	)	$	10,877
Mortgage-backed securities	—			—		(726		)	20,812		(726		)	20,812
Total securities held to maturity	$	(9	)	$	2,287	$	(862	)	$	29,402	$	(871	)	$	31,689

Held-to-maturity Securities

The amortized cost and fair values of investment securities, with gross unrealized gains and losses, consist of the following:

	December 31, 2015
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	252,514	$	1,161	$	(1,592	)	$	252,083
Obligations of state and political subdivisions	182,541		5,429		(9		)	187,961
Mortgage-backed securities	2,272,879		8,457		(16,523		)	2,264,813
Other securities	95,496		430		(497		)	95,429
Total securities available for sale	$	2,803,430	$	15,477	$	(18,621	)	$	2,800,286
Securities held to maturity:
Obligations of state and political subdivisions	$	69,979	$	2,803	$	(101	)	$	72,681
Mortgage-backed securities	28,949		107		(776		)	28,280
Total securities held to maturity	$	98,928	$	2,910	$	(877	)	$	100,961

	December 31, 2014
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	317,386	$	1,700	$	(3,533	)	$	315,553
Obligations of state and political subdivisions	86,513		3,679		(2		)	90,190
Mortgage-backed securities	1,741,917		16,882		(7,184		)	1,751,615
Other securities	1,460		35		—			1,495
Total securities available for sale	$	2,147,276	$	22,296	$	(10,719	)	$	2,158,853
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	10,000	$	88	$	—		$	10,088
Obligations of state and political subdivisions	77,597		3,153		(145		)	80,605
Mortgage-backed securities	29,363		151		(726		)	28,788
Total securities held to maturity	$	116,960	$	3,392	$	(871	)	$	119,481

Information pertaining to securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, is as follows:

	December 31, 2015
	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(1,214	)	$	177,839	$	(378	)	$	28,116	$	(1,592	)	$	205,955
Obligations of state and political subdivisions	(9		)	5,765		—			—		(9		)	5,765
Mortgage-backed securities	(11,737		)	1,279,914		(4,786		)	185,215		(16,523		)	1,465,129
Other securities	(488		)	51,975		(9		)	499		(497		)	52,474
Total securities available for sale	$	(13,448	)	$	1,515,493	$	(5,173	)	$	213,830	$	(18,621	)	$	1,729,323
Securities held to maturity:
Obligations of state and political subdivisions	$	(9	)	$	1,999	$	(92	)	$	4,162	$	(101	)	$	6,161
Mortgage-backed securities	(45		)	3,530		(731		)	17,573		(776		)	21,103
Total securities held to maturity	$	(54	)	$	5,529	$	(823	)	$	21,735	$	(877	)	$	27,264

	December 31, 2014
	Less Than Twelve Months					Over Twelve Months					Total
(Dollars in thousands)	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	—		$	—	$	(3,533	)	$	240,498	$	(3,533	)	$	240,498
Obligations of state and political subdivisions	(2		)	185		—			—		(2		)	185
Mortgage-backed securities	(1,189		)	304,686		(5,995		)	294,549		(7,184		)	599,235
Total securities available for sale	$	(1,191	)	$	304,871	$	(9,528	)	$	535,047	$	(10,719	)	$	839,918
Securities held to maturity:
Obligations of state and political subdivisions	$	(9	)	$	2,287	$	(136	)	$	8,590	$	(145	)	$	10,877
Mortgage-backed securities	—			—		(726		)	20,812		(726		)	20,812
Total securities held to maturity	$	(9	)	$	2,287	$	(862	)	$	29,402	$	(871	)	$	31,689

Additional Information on Securities in a Continuous Loss Position

Additional information on securities that have been in a continuous loss position for over twelve months at December 31 is presented in the following table.

(Dollars in thousands)	2015		2014
Number of securities
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	40		66
Issued by political subdivisions	2		5
Other	1		—
	43		71
Amortized Cost Basis
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	$	236,800	$	566,113
Issued by political subdivisions	4,253		8,727
Other	508		—
	$	241,561	$	574,840
Unrealized Loss
Issued by Fannie Mae, Freddie Mac, or Ginnie Mae	$	5,895	$	10,254
Issued by political subdivisions	92		136
Other	9		—
	$	5,996	$	10,390

Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Maturity

The amortized cost and estimated fair value of investment securities by maturity at December 31, 2015 are presented in the following table. Securities are classified according to their contractual maturities without consideration of principal amortization, potential prepayments or call options. Accordingly, actual maturities may differ from contractual maturities. Weighted average yields are calculated on the basis of the yield to maturity based on the amortized cost of each security.

	Securities Available for Sale						Securities Held to Maturity
(Dollars in thousands)	Weighted Average Yield		Amortized Cost		Estimated Fair Value		Weighted Average Yield		Amortized Cost		Estimated Fair Value
Within one year or less	2.02	%	$	14,360	$	14,373	3.83	%	$	75	$	75
One through five years	1.72		318,423		318,718		3.06		13,627		13,989
After five through ten years	2.31		501,217		506,856		2.89		16,278		16,914
Over ten years	2.14		1,969,430		1,960,339		2.91		68,948		69,983
	2.12	%	$	2,803,430	$	2,800,286	2.93	%	$	98,928	$	100,961

Schedule of Realized Gains and Losses from Sale of Securities Classified as Available for Sale

The following is a summary of realized gains and losses from the sale of securities classified as available for sale. Gains or losses on securities sold are recorded on the trade date, using the specific identification method.

	Year Ended December 31
(Dollars in thousands)	2015			2014			2013
Realized gains	$	1,834		$	863		$	2,387
Realized losses	(259		)	(92		)	(110		)
	$	1,575		$	771		$	2,277

Schedule of Securities in Other Assets on Company's Consolidated Balance Sheets

The Company accounts for the following securities at amortized cost, which approximates fair value, in “other assets” on the consolidated balance sheets at December 31:

(Dollars in thousands)	2015		2014
Federal Home Loan Bank (FHLB) stock	$	16,265	$	38,476
Federal Reserve Bank (FRB) stock	48,584		34,348
Other investments	1,159		1,306
	$	66,008	$	74,130

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Loans (Tables)

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Schedule of Non-Covered and Covered Loans

Loans consist of the following, segregated into legacy and acquired loans, for the periods indicated:

	December 31, 2015
(Dollars in thousands)	Legacy Loans		Acquired Loans		Total
Commercial loans:
Real estate	$	4,504,062	$	1,569,449	$	6,073,511
Commercial and industrial	2,952,102		492,476		3,444,578
Energy-related	677,177		3,589		680,766
	8,133,341		2,065,514		10,198,855
Residential mortgage loans:
Residential 1-4 family	610,986		501,296		1,112,282
Construction / Owner Occupied	83,037		—		83,037
	694,023		501,296		1,195,319
Consumer and other loans:
Home equity	1,575,643		490,524		2,066,167
Indirect automobile	246,214		84		246,298
Other	541,299		79,490		620,789
	2,363,156		570,098		2,933,254
Total	$	11,190,520	$	3,136,908	$	14,327,428

	December 31, 2014
(Dollars in thousands)	Legacy Loans		Acquired Loans		Total
Commercial loans:
Real estate	$	3,676,811	$	684,968	$	4,361,779
Commercial and industrial	2,452,521		119,174		2,571,695
Energy-related	872,866		7,742		880,608
	7,002,198		811,884		7,814,082
Residential mortgage loans:
Residential 1-4 family	495,638		552,603		1,048,241
Construction / Owner Occupied	32,056		—		32,056
	527,694		552,603		1,080,297
Consumer and other loans:
Home equity	1,290,976		310,129		1,601,105
Indirect automobile	396,766		392		397,158
Other	451,080		97,322		548,402
	2,138,822		407,843		2,546,665
Total	$	9,668,714	$	1,772,330	$	11,441,044

Schedule of Aging of Loans

	December 31, 2015
	Acquired loans
	Past Due (1)								Current		Discount/ Premium			Total Acquired Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	216	$	117	$	6,994	$	7,327	$	120,467	$	(2,368	)	$	125,426	$	6,994
Commercial real estate - Other	4,295		2,024		53,558		59,877		1,434,966		(50,820		)	1,444,023		52,067
Commercial and industrial	1,016		1,276		6,829		9,121		490,255		(6,900		)	492,476		5,674
Energy-related	—		—		1,368		1,368		2,221		—			3,589		1,198
Residential mortgage	73		1,806		22,873		24,752		506,103		(29,559		)	501,296		21,765
Consumer - Home equity	2,859		997		12,525		16,381		503,635		(29,492		)	490,524		11,234
Consumer - Indirect automobile	—		—		12		12		72		—			84		12
Consumer - Credit Card	—		—		17		17		565		—			582		17
Consumer - Other	580		211		667		1,458		79,167		(1,717		)	78,908		461
Total	$	9,039	$	6,431	$	104,843	$	120,313	$	3,137,451	$	(120,856	)	$	3,136,908	$	99,422
	December 31, 2014
	Acquired loans
	Past Due (1)								Current		Discount/ Premium			Total Acquired Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	2,740	$	57	$	8,225	$	11,022	$	64,393	$	(4,482	)	$	70,933	$	8,225
Commercial real estate - Other	4,986		3,330		67,302		75,618		588,947		(50,530		)	614,035		67,198
Commercial and industrial	2,118		70		4,528		6,716		119,472		(7,014		)	119,174		4,528
Energy-related	—		—		11		11		7,731		—			7,742		11
Residential mortgage	324		2,788		30,804		33,916		559,180		(40,493		)	552,603		29,553
Consumer - Home equity	3,165		385		22,800		26,350		315,788		(32,009		)	310,129		22,409
Consumer - Indirect automobile	13		17		9		39		393		(40		)	392		9
Consumer - Credit Card	10		—		24		34		614		—			648		24
Consumer - Other	1,458		113		1,967		3,538		94,652		(1,516		)	96,674		1,847
Total	$	14,814	$	6,760	$	135,670	$	157,244	$	1,751,170	$	(136,084	)	$	1,772,330	$	133,804

(1) Past due information presents acquired loans at the gross loan balance, prior to application of discounts.

The following tables provide an analysis of the aging of loans as of December 31, 2015 and 2014. Due to the difference in accounting for acquired loans, the tables below further segregate the Company’s loans between loans originated by the Company ("legacy loans") and acquired loans.

	December 31, 2015
	Legacy loans
	Past Due (1)								Current		Total Legacy Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	801	$	—	$	120	$	921	$	635,560	$	636,481	$	—
Commercial real estate - Other	2,687		793		15,517		18,997		3,848,584		3,867,581		95
Commercial and industrial	1,208		739		6,746		8,693		2,943,409		2,952,102		87
Energy-related	15		—		7,081		7,096		670,081		677,177		—
Residential mortgage	1,075		2,485		14,116		17,676		676,347		694,023		442
Consumer - Home equity	3,549		870		5,628		10,047		1,565,596		1,575,643		—
Consumer - Indirect automobile	2,187		518		1,181		3,886		242,328		246,214		—
Consumer - Credit card	394		113		394		901		76,360		77,261		—
Consumer - Other	1,923		752		769		3,444		460,594		464,038		—
Total	$	13,839	$	6,270	$	51,552	$	71,661	$	11,118,859	$	11,190,520	$	624
	December 31, 2014
	Legacy loans
	Past Due (1)								Current		Total Legacy Loans, Net of Unearned Income		Recorded Investment > 90 days and Accruing
(Dollars in thousands)	30-59 days		60-89 days		> 90 days		Total
Commercial real estate - Construction	$	507	$	—	$	69	$	576	$	483,663	$	484,239	$	—
Commercial real estate - Other	11,799		148		6,859		18,806		3,173,766		3,192,572		—
Commercial and industrial	1,589		1,860		3,225		6,674		2,445,847		2,452,521		200
Energy-related	—		—		27		27		872,839		872,866		—
Residential mortgage	1,389		2,616		14,900		18,905		508,789		527,694		538
Consumer - Home equity	4,096		595		7,420		12,111		1,278,865		1,290,976		16
Consumer - Indirect automobile	2,447		396		1,419		4,262		392,504		396,766		—
Consumer - Credit card	253		163		1,032		1,448		71,297		72,745		—
Consumer - Other	1,285		424		773		2,482		375,853		378,335		—
Total	$	23,365	$	6,202	$	35,724	$	65,291	$	9,603,423	$	9,668,714	$	754

(1) Past due loans greater than 90 days include all loans on non-accrual status, regardless of past due status, as of the period indicated. Non-accrual loans are presented separately in the “Non-accrual Loans” section below.

Schedule of Legacy Loans on Nonaccrual Status

The following table provides the unpaid principal balance of legacy loans on non-accrual status at December 31, 2015 and 2014.

(Dollars in thousands)	2015		2014
Commercial real estate - Construction	$	120	$	69
Commercial real estate - Other	15,422		6,859
Commercial and industrial	6,659		3,025
Energy-related	7,081		27
Residential mortgage	13,674		14,362
Consumer - Home equity	5,628		7,404
Consumer - Indirect automobile	1,181		1,419
Consumer - Credit card	394		1,032
Consumer - Other	769		773
Total	$	50,928	$	34,970

Schedule of Carrying Amount of Loans Acquired

The tables below show the balances acquired during 2015 for these two subsections of the acquired portfolio as of the acquisition date. These amounts are subject to change due to the finalization of purchase accounting adjustments.

(Dollars in thousands)
Contractually required principal and interest at acquisition	$	2,384,114
Expected losses and foregone interest	(15,539		)
Cash flows expected to be collected at acquisition	2,368,575
Fair value of acquired loans at acquisition	$	2,105,466

(Dollars in thousands)	Acquired Impaired Loans
Contractually required principal and interest at acquisition	$	76,445
Non-accretable difference (expected losses and foregone interest)	(11,867		)
Cash flows expected to be collected at acquisition	64,578
Accretable yield	(6,823		)
Basis in acquired loans at acquisition	$	57,755

Summary of Changes in Accretable Yields of Acquired Loans

The following is a summary of changes in the accretable difference for loans accounted for under ASC 310-30 during the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Balance at beginning of period	$	287,651		$	354,892		$	356,393
Additions	6,823			13,848			—
Transfers from non-accretable difference to accretable yield	9,916			25,844			50,743
Accretion	(80,479		)	(103,233		)	(179,456		)
Changes in expected cash flows not affecting non-accretable differences (1)	3,591			(3,700		)	127,212
Balance at end of period	$	227,502		$	287,651		$	354,892

(1) Includes changes in cash flows expected to be collected due to the impact of changes in actual or expected timing of liquidation events, modifications, changes in interest rates and changes in prepayment assumptions.

Schedule of Modified TDRs

The following table provides information on how the TDRs were modified during the year ended December 31:

(Dollars in thousands)	2015
Extended maturities	$	15,594
Interest rate adjustment	—
Maturity and interest rate adjustment	23,374
Movement to or extension of interest-rate only payments	241
Forbearance	122
Other concession(s) (1)	17,710
Total	$	57,041

(1) Other concessions may include

Schedule of Subsequently Defaulted TDRs

The following table presents the end of period balance for loans modified in a TDR during the year ended December 31, 2015. The Company had no material TDRs that were added during the year ended December 31, 2014.

	December 31, 2015
(In thousands, except number of loans)	Number of Loans	Pre-modification Outstanding Recorded Investment		Post-modification Outstanding Recorded Investment (1)
Commercial real estate	11	$	26,764	$	25,250
Commercial and industrial	26	21,233		18,114
Energy-related	2	9,797		9,484
Residential mortgage	1	70		68
Consumer - Home equity	50	4,440		3,865
Consumer - Indirect	6	79		79
Consumer - Other	17	248		181
Total	113	$	62,631	$	57,041

(1) Recorded investment includes any allowance for credit losses recorded on the TDRs at December 31, 2015.

Information detailing TDRs that defaulted during the years ended December 31, 2015 and 2014 and were modified in the previous twelve months (i.e., the twelve months prior to the default) is presented in the following table. The Company has defined a default as any loan with a loan payment that is currently past due greater than 30 days, or was past due greater than 30 days at any point during the previous twelve months, or since the date of modification, whichever is shorter.

	December 31, 2015			December 31, 2014
(In thousands, except number of loans)	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
Commercial real estate	6	$	22,075	30	$	—
Commercial and industrial	20	8,970		9	1,600
Energy-related	1	3,120		—	—
Residential mortgage	—	—		—	—
Consumer - Home Equity	20	1,547		—	—
Consumer - Indirect automobile	6	79		—	—
Consumer - Other	9	2		1	—
Total	62	$	35,793	40	$	1,600

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Allowance for Credit Losses and Credit Quality (Tables)

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Schedule of Allowance for Loan Losses for Covered and Non-Covered Loan Portfolios

A summary of changes in the allowance for credit losses for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	76,174		$	53,957		$	130,131
Provision for loan losses before adjustment attributable to FDIC loss share agreements	27,711			1,837			29,548
Adjustment attributable to FDIC loss share arrangements	—			1,360			1,360
Net provision for loan losses	27,711			3,197			30,908
Adjustment attributable to FDIC loss share arrangements	—			(1,360		)	(1,360		)
Transfer of balance to OREO	—			(1,221		)	(1,221		)
Loans charged-off	(15,778		)	(10,737		)	(26,515		)
Recoveries	5,701			734			6,435
Allowance for loan losses at end of period	$	93,808		$	44,570		$	138,378
Reserve for unfunded commitments at beginning of period	$	11,801		$	—		$	11,801
Provision for unfunded lending commitments	2,344			—			2,344
Reserve for unfunded commitments at end of period	$	14,145		$	—		$	14,145
Allowance for credit losses at end of period	$	107,953		$	44,570		$	152,523

	2014
	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	67,342		$	75,732		$	143,074
Provision for loan losses before adjustment attributable to FDIC loss share agreements	14,274			526			14,800
Adjustment attributable to FDIC loss share arrangements	—			4,260			4,260
Net provision for loan losses	14,274			4,786			19,060
Adjustment attributable to FDIC loss share arrangements	—			(4,260		)	(4,260		)
Transfer of balance to OREO	—			(7,323		)	(7,323		)
Loans charged-off	(11,312		)	(15,543		)	(26,855		)
Recoveries	5,870			565			6,435
Allowance for loan losses at end of period	$	76,174		$	53,957		$	130,131
Reserve for unfunded commitments at beginning of period	$	11,147		$	—		$	11,147
Provision for unfunded lending commitments	654			—			654
Reserve for unfunded commitments at end of period	$	11,801		$	—		$	11,801
Allowance for credit losses at end of period	$	87,975		$	53,957		$	141,932

	2013
	Legacy Loans			Acquired Loans			Total
Allowance for credit losses
Allowance for loan losses at beginning of period	$	74,211		$	177,392		$	251,603
Provision for (Reversal of) loan losses before adjustment attributable to FDIC loss share agreements	6,828			(57,768		)	(50,940		)
Adjustment attributable to FDIC loss share arrangements	—			56,085			56,085
Net provision for (reversal of) loan losses	6,828			(1,683		)	5,145
Adjustment attributable to FDIC loss share arrangements	—			(56,085		)	(56,085		)
Transfer of balance to OREO	—			(28,126		)	(28,126		)
Transfer of balance to the RULC	(9,828		)	—			(9,828		)
Loans charged-off	(10,686		)	(15,795		)	(26,481		)
Recoveries	6,817			29			6,846
Allowance for loan losses at end of period	$	67,342		$	75,732		$	143,074
Reserve for unfunded commitments at beginning of period	$	—		$	—		$	—
Transfer of balance from the allowance for loan losses	9,828			—			9,828
Provision for unfunded lending commitments	1,319			—			1,319
Reserve for unfunded commitments at end of period	$	11,147		$	—		$	11,147
Allowance for credit losses at end of period	$	78,489		$	75,732		$	154,221

A summary of changes in the allowance for credit losses for legacy loans, by loan portfolio type, for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	26,752		$	24,455		$	5,949		$	2,678		$	16,340		$	76,174
(Reversal of) Provision for loan losses	(1,466		)	(103		)	17,917			1,493			9,870			27,711
Loans charged off	(2,525		)	(1,276		)	(3		)	(291		)	(11,683		)	(15,778		)
Recoveries	1,897			207			—			67			3,530			5,701
Allowance for loan losses at end of period	$	24,658		$	23,283		$	23,863		$	3,947		$	18,057		$	93,808
Reserve for unfunded commitments at beginning of period	$	3,370		$	3,733		$	1,596		$	168		$	2,934		$	11,801
Provision for (Reversal of) unfunded commitments	790			(285		)	1,069			662			108			2,344
Reserve for unfunded commitments at end of period	$	4,160		$	3,448		$	2,665		$	830		$	3,042		$	14,145
Allowance on loans individually evaluated for impairment	$	1,246		$	272		$	2,122		$	1		$	352		$	3,993
Allowance on loans collectively evaluated for impairment	23,412			23,011			21,741			3,946			17,705			89,815
Loans, net of unearned income:
Balance at end of period	$	4,504,062		$	2,952,102		$	677,177		$	694,023		$	2,363,156		$	11,190,520
Balance at end of period individually evaluated for impairment	28,857			20,086			13,020			70			4,608			66,641
Balance at end of period collectively evaluated for impairment	4,475,205			2,932,016			$	664,157		693,953			2,358,548			11,123,879

	2014
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	22,872		$	20,839		$	6,878		$	2,546		$	14,207		$	67,342
Provision for (Reversal of) loan losses	2,171			4,971			(929		)	566			7,495			14,274
Loans charged off	(1,164		)	(1,400		)	—			(578		)	(8,170		)	(11,312		)
Recoveries	2,873			45			—			144			2,808			5,870
Allowance for loan losses at end of period	$	26,752		$	24,455		$	5,949		$	2,678		$	16,340		$	76,174
Reserve for unfunded commitments at beginning of period	$	3,071		$	1,814		$	3,043		$	72		$	3,147		$	11,147
Provision for (Reversal of) unfunded commitments	299			1,919			(1,447		)	96			(213		)	654
Reserve for unfunded commitments at end of period	$	3,370		$	3,733		$	1,596		$	168		$	2,934		$	11,801
Allowance on loans individually evaluated for impairment	$	20		$	407		$	—		$	—		$	3		$	430
Allowance on loans collectively evaluated for impairment	26,732			24,048			5,949			2,678			16,337			75,744
Loans, net of unearned income:
Balance at end of period	$	3,676,811		$	2,452,521		$	872,866		$	527,694		$	2,138,822		$	9,668,714
Balance at end of period individually evaluated for impairment	7,013			3,988			—			—			699			11,700
Balance at end of period collectively evaluated for impairment	3,669,798			2,448,533			872,866			527,694			2,138,123			9,657,014

	2013
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	31,298		$	20,605		$	6,812	$	1,583		$	13,913		$	74,211
(Reversal of) Provision for loan losses	(5,919		)	3,870			66		758			8,053			6,828
Transfer of balance to the RULC	(2,939		)	(3,497		)	—		(40		)	(3,352		)	(9,828		)
Loans charged off	(2,908		)	(516		)	—		(519		)	(6,743		)	(10,686		)
Recoveries	3,340			377			—		764			2,336			6,817
Allowance for loan losses at end of period	$	22,872		$	20,839		$	6,878	$	2,546		$	14,207		$	67,342
Reserve for unfunded commitments at beginning of period	$	—		$	—		$	—	$	—		$	—		$	—
Transfer of balance from the allowance for loan losses	2,939			3,497			—		40			3,352			9,828
Provision for unfunded lending commitments	132			(1,683		)	3,043		32			(205		)	1,319
Reserve for unfunded commitments at end of period	$	3,071		$	1,814		$	3,043	$	72		$	3,147		$	11,147
Allowance on loans individually evaluated for impairment	$	8		$	841		$	—	$	180		$	—		$	1,029
Allowance on loans collectively evaluated for impairment	22,864			19,998			6,878		2,366			14,207			66,313
Loans, net of unearned income:
Balance at end of period	$	3,054,100		$	2,234,173		$	752,682	$	414,372		$	1,832,994		$	8,288,321
Balance at end of period individually evaluated for impairment	8,705			15,812			—		1,407			258			26,182
Balance at end of period collectively evaluated for impairment	3,045,395			2,218,361			752,682		412,965			1,832,736			8,262,139

A summary of changes in the allowance for loan losses for acquired loans, by loan portfolio type, for the years ended December 31 is as follows:

	2015
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	29,949		$	3,265		$	51	$	6,484		$	14,208		$	53,957
Provision for (Reversal of) loan losses	2,182			(122		)	74		2,126			(1,063		)	3,197
Increase (Decrease) in FDIC loss share receivable	757			(49		)	—		(235		)	(1,833		)	(1,360		)
Transfer of balance to OREO	174			(170		)	—		(541		)	(684		)	(1,221		)
Loans charged off	(7,810		)	(105		)	—		—			(2,822		)	(10,737		)
Recoveries	727			—			—		7			—			734
Allowance for loan losses at end of period	$	25,979		$	2,819		$	125	$	7,841		$	7,806		$	44,570
Allowance on loans individually evaluated for impairment	$	—		$	41		$	—	$	—		$	45		$	86
Allowance on loans collectively evaluated for impairment	25,979			2,778			125		7,841			7,761			44,484
Loans, net of unearned income:
Balance at end of period	$	1,569,449		$	492,476		$	3,589	$	501,296		$	570,098		$	3,136,908
Balance at end of period individually evaluated for impairment	720			164			—		—			458			1,342
Balance at end of period collectively evaluated for impairment	1,149,315			450,652			3,589		360,252			447,048			2,410,856
Balance at end of period acquired with deteriorated credit quality	419,414			41,660			—		141,044			122,592			724,710

	2014
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Energy-related		Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	42,026		$	6,641		$	—	$	10,889		$	16,176		$	75,732
Provision for loan losses	665			536			51		1,296			2,238			4,786
Increase (Decrease) in FDIC loss share receivable	227			509			—		(3,854		)	(1,142		)	(4,260		)
Transfer of balance to OREO	(1,897		)	(2,030		)	—		(1,719		)	(1,677		)	(7,323		)
Loans charged off	(11,201		)	(2,451		)	—		(232		)	(1,659		)	(15,543		)
Recoveries	129			60			—		104			272			565
Allowance for loan losses at end of period	$	29,949		$	3,265		$	51	$	6,484		$	14,208		$	53,957
Allowance on loans individually evaluated for impairment	$	—		$	—		$	—	$	—		$	—		$	—
Allowance on loans collectively evaluated for impairment	29,949			3,265			51		6,484			14,208			53,957
Loans, net of unearned income:
Balance at end of period	$	684,968		$	119,174		$	7,742	$	552,603		$	407,843		$	1,772,330
Balance at end of period individually evaluated for impairment	—			—			—		—			—			—
Balance at end of period collectively evaluated for impairment	169,338			60,584			7,742		402,347			265,168			905,179
Balance at end of period acquired with deteriorated credit quality	515,630			58,590			—		150,256			142,675			867,151

	2013
(Dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Residential Mortgage			Consumer			Total
Allowance for loan losses at beginning of period	$	107,269		$	13,246		$	23,108		$	33,769		$	177,392
(Reversal of) Provision for loan losses	(1,286		)	(1,146		)	390			359			(1,683		)
(Decrease) Increase in FDIC loss share receivable	(28,238		)	(5,032		)	(4,896		)	(17,919		)	(56,085		)
Transfer of balance to OREO	(19,953		)	(427		)	(7,713		)	(33		)	(28,126		)
Loans charged off	(15,795		)	—			—			—			(15,795		)
Recoveries	29			—			—			—			29
Allowance for loan losses at end of period	$	42,026		$	6,641		$	10,889		$	16,176		$	75,732
Allowance on loans individually evaluated for impairment	$	—		$	—		$	—		$	—		$	—
Allowance on loans collectively evaluated for impairment	42,026			6,641			10,889			16,176			75,732
Loans, net of unearned income:
Balance at end of period	$	732,401		$	90,062		$	172,160		$	209,075		$	1,203,698
Balance at end of period individually evaluated for impairment	—			—			—			—			—
Balance at end of period collectively evaluated for impairment	393,487			37,430			162,248			157,744			750,909
Balance at end of period acquired with deteriorated credit quality	338,914			52,632			9,912			51,331			452,789

Investment in Legacy and Acquired Loans by Credit Quality Indicator

The Company’s investment in loans by credit quality indicator is presented in the following tables. The tables below further segregate the Company’s loans between loans that were originated by the Company (legacy loans) and acquired loans. Loan premiums/discounts in the tables below represent the adjustment of non-covered acquired loans to fair value at the acquisition date, as adjusted for income accretion and changes in cash flow estimates in subsequent periods. Asset risk classifications for commercial loans reflect the classification as of December 31, 2015 and 2014, respectively. Credit quality information in the tables below includes loans acquired at the gross loan balance, prior to the application of premiums/discounts, at December 31, 2015 and 2014.

Loan delinquency is the primary credit quality indicator that the Company utilizes to monitor consumer asset quality.

	Legacy loans
	December 31, 2015										December 31, 2014
(Dollars in thousands)	Pass		Special Mention		Sub- standard		Doubtful		Total		Pass		Special Mention		Sub- standard		Doubtful		Total
Commercial real estate - Construction	$	634,889	$	160	$	1,432	$	—	$	636,481	$	483,930	$	240	$	69	$	—	$	484,239
Commercial real estate - Other	3,806,528		21,877		37,001		2,175		3,867,581		3,120,370		49,847		22,193		162		3,192,572
Commercial and industrial	2,911,396		14,826		19,888		5,992		2,952,102		2,414,293		7,330		28,965		1,933		2,452,521
Energy-related	531,657		67,937		74,272		3,311		677,177		872,842		—		24		—		872,866
Total	$	7,884,470	$	104,800	$	132,593	$	11,478	$	8,133,341	$	6,891,435	$	57,417	$	51,251	$	2,095	$	7,002,198

	Legacy loans
	December 31, 2015						December 31, 2014
(Dollars in thousands)	Current		30+ Days Past Due		Total		Current		30+ Days Past Due		Total
Residential mortgage	$	676,347	$	17,676	$	694,023	$	508,789	$	18,905	$	527,694
Consumer - Home equity	1,565,596		10,047		1,575,643		1,278,865		12,111		1,290,976
Consumer - Indirect automobile	242,328		3,886		246,214		392,504		4,262		396,766
Consumer - Credit card	76,360		901		77,261		71,297		1,448		72,745
Consumer - Other	460,594		3,444		464,038		375,853		2,482		378,335
Total	$	3,021,225	$	35,954	$	3,057,179	$	2,627,308	$	39,208	$	2,666,516

	Acquired loans
	December 31, 2015															December 31, 2014
(Dollars in thousands)	Pass		Special Mention		Sub-standard		Doubtful		Loss		Discount			Total		Pass		Special Mention		Sub-standard		Doubtful		Discount			Total
Commercial real estate - Construction	$	116,539	$	1,681	$	8,803	$	771	$	—	$	(2,368	)	$	125,426	$	58,849	$	3,934	$	12,632	$	—	$	(4,482	)	$	70,933
Commercial real estate - Other	1,383,409		26,080		79,119		6,124		111		(50,820		)	1,444,023		530,958		33,216		100,391		—		(50,530		)	614,035
Commercial and industrial	473,241		8,376		16,510		1,206		43		(6,900		)	492,476		109,593		2,256		14,082		257		(7,014		)	119,174
Energy-related	2,166		55		170		1,198		—		—			3,589		7,731		—		11		—		—			7,742
Total	$	1,975,355	$	36,192	$	104,602	$	9,299	$	154	$	(60,088	)	$	2,065,514	$	707,131	$	39,406	$	127,116	$	257	$	(62,026	)	$	811,884

	Acquired loans
	December 31, 2015									December 31, 2014
(Dollars in thousands)	Current		30+ Days Past Due		Premium (discount)			Total		Current		30+ Days Past Due		Premium (discount)			Total
Residential mortgage	$	506,103	$	24,752	$	(29,559	)	$	501,296	$	559,180	$	33,916	$	(40,493	)	$	552,603
Consumer - Home equity	503,635		16,381		(29,492		)	490,524		315,788		26,350		(32,009		)	310,129
Consumer - Indirect automobile	72		12		—			84		393		39		(40		)	392
Consumer - Other	79,732		1,475		(1,717		)	79,490		95,266		3,572		(1,516		)	97,322
Total	$	1,089,542	$	42,620	$	(60,768	)	$	1,071,394	$	970,627	$	63,877	$	(74,058	)	$	960,446

Schedule of Investment in Legacy Impaired Loans

Information on the Company’s investment in legacy impaired loans, which include all TDRs and all other non-accrual loans, is presented in the following tables as of and for the periods indicated.  Legacy non-accrual mortgage and consumer loans, and commercial loans below the Company’s specific threshold, are included for purposes of this disclosure although such loans are not evaluated or measured individually for impairment for purposes of determining the allowance for loan losses.

	December 31, 2015
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	16,145	$	16,145	$	—		$	15,864	$	315
Commercial and industrial	14,340		14,340		—			18,839		1,148
Energy-related	—		—		—			—		—
Consumer - Home equity	730		730		—			533		22
Consumer - Other	66		66		—			66		5
With an allowance recorded:
Commercial real estate	12,500		13,753		(1,253		)	14,055		554
Commercial and industrial	5,985		6,262		(277		)	7,352		331
Energy-related	11,319		13,444		(2,125		)	14,339		471
Residential mortgage	13,679		13,743		(64		)	14,086		82
Consumer - Home equity	8,196		8,559		(363		)	7,554		129
Consumer - Indirect automobile	1,171		1,181		(10		)	1,613		44
Consumer - Credit card	386		394		(8		)	881		—
Consumer - Other	876		899		(23		)	1,039		44
Total	$	85,393	$	89,516	$	(4,123	)	$	96,221	$	3,145
Total commercial loans	$	60,289	$	63,944	$	(3,655	)	$	70,449	$	2,819
Total mortgage loans	13,679		13,743		(64		)	14,086		87
Total consumer loans	11,425		11,829		(404		)	11,686		244

	December 31, 2014
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	6,680	$	6,680	$	—		$	6,703	$	132
Commercial and industrial	2,483		2,483		—			2,873		57
Consumer - Home equity	682		682		—			696		19
With an allowance recorded:
Commercial real estate	1,044		1,069		(25		)	1,134		38
Commercial and industrial	1,209		1,617		(408		)	2,113		23
Energy-related	27		27		—			28		1
Residential mortgage	14,111		14,363		(252		)	14,263		110
Consumer - Home equity	7,121		7,165		(44		)	7,544		43
Consumer - Indirect automobile	1,410		1,419		(9		)	2,016		51
Consumer - Credit card	1,012		1,032		(20		)	797		—
Consumer - Other	781		790		(9		)	1,009		39
Total	$	36,560	$	37,327	$	(767	)	$	39,176	$	513
Total commercial loans	$	11,443	$	11,876	$	(433	)	$	12,851	$	251
Total mortgage loans	14,111		14,363		(252		)	14,263		110
Total consumer loans	11,006		11,088		(82		)	12,062		152

	December 31, 2013
(Dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial real estate	$	8,567	$	8,567	$	—		$	10,443	$	43
Commercial and industrial	13,256		13,256		—			11,074		170
Consumer - Home equity	258		258		—			281		1
With an allowance recorded:
Commercial real estate	1,268		1,284		(16		)	4,414		8
Commercial and industrial	1,927		2,770		(843		)	2,892		100
Residential mortgage	11,408		11,645		(237		)	9,675		98
Consumer - Home equity	6,506		6,550		(44		)	7,593		93
Consumer - Indirect automobile	1,267		1,275		(8		)	2,090		55
Consumer - Credit card	404		411		(7		)	418		—
Consumer - Other	481		485		(4		)	765		19
Total	$	45,342	$	46,501	$	(1,159	)	$	49,645	$	587
Total commercial loans	$	25,018	$	25,877	$	(859	)	$	28,823	$	321
Total mortgage loans	11,408		11,645		(237		)	9,675		98
Total consumer loans	8,916		8,979		(63		)	11,147		168

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Loss Sharing Agreements and FDIC Loss Share Receivable (Tables)

12 Months Ended

Dec. 31, 2015

Loss Sharing Agreements and FDIC Loss Share Receivable [Abstract]

Schedule of FDIC Loss Share Receivables

The following is a summary of FDIC loss share receivables year-to-date activity:

	December 31
(Dollars in thousands)	2015			2014
Balance at beginning of period	$	69,627		$	162,312
Change due to (reversal of) loan loss provision recorded on FDIC covered loans	(1,360		)	(4,260		)
Amortization	(23,500		)	(74,617		)
(Submission of reimbursable losses) recoveries payable to the FDIC	(2,444		)	3,282
Impairment	—			(5,121		)
Changes due to a change in cash flow assumptions on OREO and other changes	(2,445		)	(11,969		)
Balance at end of period	$	39,878		$	69,627

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Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity) (Tables)

12 Months Ended

Dec. 31, 2015

Transfers and Servicing [Abstract]

Changes in Carrying Amount of Mortgage Loans Held-for-sale

Changes to the carrying amount of mortgage loans held for sale at December 31 are presented in the following table.

(Dollars in thousands)	2015			2014			2013
Balance at beginning of period	$	140,072		$	128,442		$	267,475
Originations and purchases	2,464,588			1,675,538			2,116,460
Sales, net of gains	(2,432,979		)	(1,657,409		)	(2,255,493		)
Other	(5,434		)	(6,499		)	—
Balance at end of period	$	166,247		$	140,072		$	128,442

Components of Mortgage Income

The following table details the components of mortgage income for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Fair value changes of derivatives and mortgage loans held for sale:
Mortgage loans held for sale and derivatives	$	2,216		$	631		$	(4,822	)
Derivative settlements, net	(5,017		)	(8,743		)	3,100
Gains on sales	83,131			59,156			65,393
Servicing and other income, net	792			753			526
	$	81,122		$	51,797		$	64,197

Schedule of Mortgage Servicing Rights at Carrying Value

Mortgage servicing rights had the following carrying values as of the periods indicated:

	December 31, 2015							December 31, 2014
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
(Dollars in thousands)
Mortgage servicing rights	$	6,104	$	(2,320	)	$	3,784	$	4,751	$	(1,253	)	$	3,498

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Premises and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Schedule of Premises and Equipment

Premises and equipment consisted of the following at December 31:

(Dollars in thousands)	2015			2014
Land	$	84,438		$	75,916
Buildings	245,934			232,727
Furniture, fixtures and equipment	140,031			128,388
Total premises and equipment	470,403			437,031
Accumulated depreciation	(146,501		)	(129,872		)
Total premises and equipment, net	$	323,902		$	307,159

Schedule of Minimum Future Annual Rent Commitments

Minimum future annual rent commitments under lease agreements for the periods indicated are as follows:

(Dollars in thousands)
2016	$	16,957
2017	14,751
2018	13,491
2019	11,952
2020	10,735
2021 and thereafter	41,054
	$	108,940

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Goodwill and Other Acquired Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Amount of Goodwill

Changes to the carrying amount of goodwill by reportable segment for the years ended December 31, 2015 and 2014 are provided in the following table.

(Dollars in thousands)	IBERIABANK		IMC		LTC		Total
Balance, December 31, 2013	$	373,905	$	23,178	$	4,789	$	401,872
Goodwill acquired during the year	115,278		—		376		115,654
Balance, December 31, 2014	$	489,183	$	23,178	$	5,165	$	517,526
Goodwill acquired during the year	207,077		—		—		207,077
Balance, December 31, 2015	$	696,260	$	23,178	$	5,165	$	724,603

Schedule of Definite-Lived Intangible Assets

Definite-lived intangible assets had the following carrying values included in “other assets” on the Company’s consolidated balance sheets as of December 31:

	2015							2014
(Dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Core deposit intangibles	$	74,001	$	(43,957	)	$	30,044	$	55,949	$	(36,354	)	$	19,595
Customer relationship intangible asset	1,348		(984		)	364		1,348		(822		)	526
Non-compete agreement	100		(79		)	21		163		(82		)	81
Other intangible assets	205		(114		)	91		205		(46		)	159
Total	$	75,654	$	(45,134	)	$	30,520	$	57,665	$	(37,304	)	$	20,361

Schedule of Amortization Expense of Intangible Assets

The related amortization expense of intangible assets is as follows:

(Dollars in thousands)	Amount
Aggregate amortization expense for the years ended December 31:
2013	$	4,720
2014	5,807
2015	7,811

(Dollars in thousands)
Estimated amortization expense for the years ended December 31:
2016	$	8,338
2017	6,775
2018	5,786
2019	5,066
2020	3,613
2021 and thereafter	942

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Derivative Instruments and Other Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Outstanding Derivative Instruments

Information pertaining to outstanding derivative instruments is as follows:

	Balance Sheet Location	Asset Derivatives Fair Value				Balance Sheet Location	Liability Derivatives Fair Value
(Dollars in thousands)		December 31, 2015		December 31, 2014			December 31, 2015		December 31, 2014
Derivatives designated as hedging instruments under ASC Topic 815:
Interest rate contracts	Other assets	$	58	$	—	Other liabilities	$	—	$	—
Total derivatives designated as hedging instruments under ASC Topic 815		$	58	$	—		$	—	$	—
Derivatives not designated as hedging instruments under ASC Topic 815:
Interest rate contracts	Other assets	$	18,077	$	15,434	Other liabilities	$	18,077	$	15,434
Foreign exchange contracts	Other assets	156		—		Other liabilities	134		—
Forward sales contracts	Other assets	1,588		25		Other liabilities	474		2,556
Written and purchased options	Other assets	10,607		17,444		Other liabilities	6,254		13,364
Total derivatives not designated as hedging instruments under ASC Topic 815		$	30,428	$	32,903		$	24,939	$	31,354
Total		$	30,486	$	32,903		$	24,939	$	31,354
		Asset Derivatives Notional Amount					Liability Derivatives Notional Amount
(Dollars in thousands)		December 31, 2015		December 31, 2014			December 31, 2015		December 31, 2014
Derivatives designated as hedging instruments under ASC Topic 815:
Interest rate contracts		$	108,500	$	—		$	—	$	—
Total derivatives designated as hedging instruments under ASC Topic 815		$	108,500	$	—		$	—	$	—
Derivatives not designated as hedging instruments under ASC Topic 815:
Interest rate contracts		$	590,334	$	444,703		$	590,334	$	444,703
Foreign exchange contracts		4,392		—			4,392		—
Forward sales contracts		223,841		15,897			173,430		391,992
Written and purchased options		328,210		362,580			181,949		225,741
Total derivatives not designated as hedging instruments under ASC Topic 815		$	1,146,777	$	823,180		$	950,105	$	1,062,436
Total		$	1,255,277	$	823,180		$	950,105	$	1,062,436

Offsetting Assets

The following table reconciles the gross amounts presented in the consolidated balance sheets to the net amounts that would result in the event of offset.

	December 31, 2015
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet					Net
(Dollars in thousands)			Derivatives		Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts designated as hedging instruments	$	58	$	—	$	(45	)	$	13
Interest rate contracts not designated as hedging instruments	18,058		—		—			18,058
Written and purchased options	6,277		—		—			6,277
Total derivative assets subject to master netting arrangements	$	24,393	$	—	$	(45	)	$	24,348
Derivative liabilities
Interest rate contracts not designated as hedging instruments	18,058		—		(9,428		)	8,630
Total derivative liabilities subject to master netting arrangements	$	18,058	$	—	$	(9,428	)	$	8,630

(1) Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.

	December 31, 2014
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet					Net
(Dollars in thousands)			Derivatives		Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts designated as hedging instruments	$	—	$	—	$	—		$	—
Interest rate contracts not designated as hedging instruments	15,411		—		—			15,411
Written and purchased options	13,387		—		—			13,387
Total derivative assets subject to master netting arrangements	$	28,798	$	—	$	—		$	28,798
Derivative liabilities
Interest rate contracts not designated as hedging instruments	15,411		—		(3,735		)	11,676
Total derivative liabilities subject to master netting arrangements	$	15,411	$	—	$	(3,735	)	$	11,676

(1) Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.

Offsetting Liabilities

The following table reconciles the gross amounts presented in the consolidated balance sheets to the net amounts that would result in the event of offset.

	December 31, 2015
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet					Net
(Dollars in thousands)			Derivatives		Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts designated as hedging instruments	$	58	$	—	$	(45	)	$	13
Interest rate contracts not designated as hedging instruments	18,058		—		—			18,058
Written and purchased options	6,277		—		—			6,277
Total derivative assets subject to master netting arrangements	$	24,393	$	—	$	(45	)	$	24,348
Derivative liabilities
Interest rate contracts not designated as hedging instruments	18,058		—		(9,428		)	8,630
Total derivative liabilities subject to master netting arrangements	$	18,058	$	—	$	(9,428	)	$	8,630

(1) Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.

	December 31, 2014
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet					Net
(Dollars in thousands)			Derivatives		Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts designated as hedging instruments	$	—	$	—	$	—		$	—
Interest rate contracts not designated as hedging instruments	15,411		—		—			15,411
Written and purchased options	13,387		—		—			13,387
Total derivative assets subject to master netting arrangements	$	28,798	$	—	$	—		$	28,798
Derivative liabilities
Interest rate contracts not designated as hedging instruments	15,411		—		(3,735		)	11,676
Total derivative liabilities subject to master netting arrangements	$	15,411	$	—	$	(3,735	)	$	11,676

(1) Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.

Effect of Derivatives on the Consolidated Financial Statements

At December 31, 2015, 2014, and 2013, and for the years then ended, information pertaining to the effect of the hedging instruments on the consolidated financial statements is as follows:

																Location of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
			Amount of Gain (Loss) Recognized in OCI net of taxes (Effective Portion)					Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
(Dollars in thousands)
			For the Years Ended December 31
Derivatives in ASC Topic 815 Cash Flow Hedging Relationships			2015	2014		2013				2015	2014		2013				2015		2014			2013
	Interest rate contracts	$	38	$	—	$	619	Other income (expense)	$	—	$	—	$	(391	)	Other income (expense)	$	—	$	(1	)	$	1
Total		$	38	$	—	$	619		$	—	$	—	$	(391	)		$	—	$	(1	)	$	1

Information pertaining to the effect of derivatives not designated as hedging instruments on the consolidated financial statements as of December 31, is as follows:

	Location of Gain (Loss) Recognized in Income on Derivatives	Amount of Gain (Loss) Recognized in Income on Derivatives
(Dollars in thousands)		2015			2014			2013
Interest rate contracts	Other income	$	4,143		$	2,513		$	2,991
Foreign exchange contracts	Other income	22			—			—
Forward sales contracts	Mortgage Income	(2,947		)	(3,225		)	(1,716		)
Written and purchased options	Mortgage Income	274			(5,739		)	(3,032		)
Total		$	1,492		$	(6,451	)	$	(1,757	)

Schedule of Derivative Instruments

At December 31, additional information pertaining to outstanding interest rate swap agreements not designated as hedging instruments is as follows:

(Dollars in thousands)	2015			2014			2013
Weighted average pay rate	3.2		%	2.9		%	3.0		%
Weighted average receive rate	0.9		%	0.4		%	0.2		%
Weighted average maturity in years	7.5 years			7.7 years			7.6 years
Unrealized gain (loss) relating to interest rate swaps	$	—		$	—		$	—

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Deposits (Tables)

12 Months Ended

Dec. 31, 2015

Banking and Thrift [Abstract]

Schedule of Deposits by Type

Deposits at December 31 are summarized as follows:

(Dollars in thousands)	2015		2014
Non-interest-bearing deposits	$	4,352,229	$	3,195,430
Negotiable order of withdrawal (NOW)	2,974,176		2,462,841
Money market deposits accounts (MMDA)	6,010,882		4,168,504
Savings deposits	716,838		577,513
Certificates of deposit and other time deposits	2,124,623		2,116,237
	$	16,178,748	$	12,520,525

Schedule of Time Deposits

Total time deposits summarized by denomination at December 31 are as follows:

(Dollars in thousands)	2015		2014
Time deposits less than $250,000	$	1,456,804	$	1,767,448
Time deposits greater than $250,000	667,819		348,789
	$	2,124,623	$	2,116,237

Schedule of Maturities of Certificates of Deposit

A schedule of maturities of all time deposits as of December 31, 2015 is as follows:

(Dollars in thousands)
Years ending December 31
2016	$	1,380,655
2017	423,866
2018	112,915
2019	64,170
2020	81,418
2021 and thereafter	61,599
	$	2,124,623

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Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Summary of Short-Term Borrowings

Short-term borrowings at December 31 are summarized as follows:

(Dollars in thousands)	2015		2014
Federal Home Loan Bank advances	$	110,000	$	603,000
Securities sold under agreements to repurchase	216,617		242,742
	$	326,617	$	845,742

Securities sold under agreements to repurchase, which are classified as secured borrowings, generally mature daily and are reflected at the amount of cash received in connection with the transaction. The Company may be required to provide additional collateral based on the fair value of the underlying securities.

Additional information on the Company’s short-term borrowings for the years indicated is as follows:

(Dollars in thousands)	2015			2014			2013
Outstanding at December 31	$	326,617		$	845,742		$	680,344
Maximum month-end outstanding balance	798,933			1,034,741			680,344
Average daily outstanding balance	426,011			782,033			303,352
Average rate during the year	0.18		%	0.17		%	0.16		%
Average rate at year end	0.20		%	0.18		%	0.15		%

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Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Long-term debt at December 31 is summarized as follows:

(Dollars in thousands)	2015		2014
IBERIABANK:
Federal Home Loan Bank notes, 0.903% to 7.040%	$	136,628	$	210,549
Notes payable - Investment fund contribution, 7 to 40 year term, 0.50% to 5.00% fixed	83,709		80,843
	220,337		291,392
IBERIABANK Corporation (junior subordinated debt):
Statutory Trust I, 3 month LIBOR (1), plus 3.25%, issued November 2002	10,310		10,310
Statutory Trust II, 3 month LIBOR (1), plus 3.15%, issued June 2003	10,310		10,310
Statutory Trust III, 3 month LIBOR (1), plus 2.00%, issued September 2004	10,310		10,310
Statutory Trust IV, 3 month LIBOR (1), plus 1.60%, issued October 2006	15,464		15,464
American Horizons Statutory Trust I, 3 month LIBOR (1), plus 3.15%, assumed January 2005	6,186		6,186
Statutory Trust V, 3 month LIBOR (1), plus 1.435%, issued June 2007	10,310		10,310
Statutory Trust VI, 3 month LIBOR (1), plus 2.75%, issued November 2007	12,372		12,372
Statutory Trust VII, 3 month LIBOR (1), plus 2.54%, issued November 2007	13,403		13,403
Statutory Trust VIII, 3 month LIBOR (1), plus 3.50%, issued March 2008	7,217		7,217
OMNI Trust I, 3 month LIBOR (1), plus 3.30%, assumed May 2011	8,248		8,248
OMNI Trust II, 3 month LIBOR (1), plus 2.79%, assumed May 2011	7,732		7,732
GA Commerce Trust II, 3 month LIBOR (1), plus 1.64%, assumed May 2015	8,248		—
	120,110		111,862
	$	340,447	$	403,254

(1) The interest rate on the Company’s long-term debt indexed to LIBOR is based on the 3-month LIBOR rate. The 3-month LIBOR rate was0.61%and 0.26% at December 31, 2015 and 2014, respectively.

Maturities of Long-Term Debt

Advances and long-term debt at December 31, 2015 have maturities or call dates in future years as follows:

(Dollars in thousands)
2016	$	34,789
2017	61,899
2018	21,057
2019	7,865
2020	16,308
2021 and thereafter	198,529
	$	340,447

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Provision for Income Tax Expense

The provision for income tax expense consists of the following for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Current expense	$	67,025		$	69,612		$	62,468
Deferred expense (benefit)	4,551			(25,027		)	(35,930		)
Tax credits	(11,268		)	(12,012		)	(11,690		)
ASU 2014-01 Amortization on Low Income Housing Tax Credits	2,023			1,005			251
Tax benefits attributable to items charged to equity and goodwill	1,763			2,105			1,034
	$	64,094		$	35,683		$	16,133

Reconciliation of Effective Tax Rate

The provision for federal income taxes differs from the amount computed by applying the federal income tax statutory rate of 35 percent on income before income tax expense as indicated in the following analysis for the years ended December 31:

(Dollars in thousands)	2015			2014			2013
Federal tax based on statutory rate	$	72,428		$	49,373		$	28,441
Increase (decrease) resulting from:
Effect of tax-exempt income	(6,919		)	(7,064		)	(7,282		)
Interest and other nondeductible expenses	5,899			2,642			2,007
State taxes, net of federal benefit	3,955			2,531			3,237
Tax credits	(11,268		)	(12,012		)	(11,690		)
ASU 2014-01 Amortization on Low Income Housing Tax Credits	2,023			1,005			251
Other	(2,024		)	(792		)	1,169
	$	64,094		$	35,683		$	16,133
Effective tax rate	31.0		%	25.3		%	19.9		%

Deferred Tax Assets and Liabilities

The net deferred tax asset at December 31 is as follows:

(Dollars in thousands)	2015			2014
Deferred tax asset:
NOL carryforward	$	17,258		$	978
Allowance for credit losses	56,446			59,267
Deferred compensation	7,528			6,631
Basis difference in acquired assets	48,256			53,202
Unrealized loss on securities available for sale	854			—
OREO	6,210			9,845
Other	10,438			13,530
	146,990			143,453
Deferred tax liability:
Basis difference in acquired assets	(31,975		)	(53,940		)
Gain on acquisition	(212		)	(2,426		)
FHLB stock	(122		)	(85		)
Premises and equipment	(1,658		)	(9,652		)
Acquisition intangibles	(7,648		)	(12,151		)
Deferred loan costs	(4,610		)	(3,771		)
Unrealized gain on securities available for sale	—			(4,052		)
Investments acquired	(167		)	(570		)
Swap gain	—			(75		)
Other	(16,694		)	(12,908		)
	(63,086		)	(99,630		)
Net deferred tax asset	$	83,904		$	43,823

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Capital Requirements and Other Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2015

Banking and Thrift [Abstract]

Actual Capital Amounts and Ratios

The Company’s and IBERIABANK’s actual capital amounts and ratios as of December 31 are presented in the following table.

(Dollars in thousands)	2015
	Minimum				Well-Capitalized		Actual
	Amount		Ratio		Amount	Ratio	Amount		Ratio
Tier 1 Leverage
Consolidated	$	751,798	4.00	%	N/A	N/A	$	1,790,034	9.52	%
IBERIABANK	749,226		4.00		936,532	5.00	1,691,022		9.03
Common Equity Tier 1 (CET1) (1)
Consolidated	$	752,610	4.50	%	N/A	N/A	$	1,684,097	10.07	%
IBERIABANK	750,660		4.50		1,084,287	6.50	1,691,022		10.14
Tier 1 risk-based capital
Consolidated	$	1,003,479	6.00	%	N/A	N/A	$	1,790,034	10.70	%
IBERIABANK	1,000,880		6.00		1,334,507	8.00	1,691,022		10.14
Total risk-based capital
Consolidated	$	1,337,973	8.00	%	N/A	N/A	$	2,029,932	12.14	%
IBERIABANK	1,334,507		8.00		1,668,133	10.00	1,843,545		11.05

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Calculation of Basic and Diluted Earnings Per Share

The following table presents the calculation of basic and diluted earnings per share for the periods indicated.

	For the Years Ended December 31,
(In thousands, except per share data)	2015			2014			2013
Earnings per common share - basic
Net income	$	142,844		$	105,382		$	65,128
Dividends and undistributed earnings allocated to unvested restricted shares	(1,680		)	(1,651		)	(1,205		)
Net income allocated to common shareholders - basic	$	141,164		$	103,731		$	63,923
Weighted average common shares outstanding	38,214			31,307			29,052
Earnings per common share - basic	3.69			3.31			2.20
Earnings per common share - diluted
Net income allocated to common shareholders - basic	$	141,164		$	103,731		$	63,923
Dividends and undistributed earnings allocated to unvested restricted shares	(48		)	(34		)	(4		)
Net income allocated to common shareholders - diluted	$	141,116		$	103,697		$	63,919
Weighted average common shares outstanding	38,214			31,307			29,052
Dilutive potential common shares	96			126			53
Weighted average common shares outstanding - diluted	38,310			31,433			29,105
Earnings per common share outstanding - diluted	$	3.68		$	3.30		$	2.20

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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation Arrangements by Share-based Payment Award

The following table represents phantom stock award and performance unit activity during the periods indicated.

(Dollars in thousands)	Number of share equivalents (1)		Value of share equivalents (2)
Balance, December 31, 2012	328,273		$	16,125
Granted	179,041		11,253
Forfeited share equivalents	(18,744	)	1,178
Vested share equivalents	(54,686	)	2,937
Balance, December 31, 2013	433,884		$	27,270
Granted	146,166		9,479
Forfeited share equivalents	(22,800	)	1,479
Vested share equivalents	(81,903	)	5,512
Balance, December 31, 2014	475,347		$	30,826
Granted	167,573		9,228
Forfeited share equivalents	(34,681	)	1,910
Vested share equivalents	(145,809	)	9,288
Balance, December 31, 2015	462,430		$	25,466

(1) Number of share equivalents includes all reinvested dividend equivalents for the years indicated.

(2) Except for share equivalents at the beginning of each period, which are based on the value at that time, and vested share payments, which are based on the cash paid at the time of vesting, the value of share equivalents is calculated based on the market price of the Company’s stock at the end of the respective periods. The market price of the Company’s stock was $55.07, $64.85 and $62.85 on December 31, 2015, 2014 and 2013, respectively.

The following table represents unvested restricted stock award and restricted share unit activity for the years ended December 31:

	2015		2014		2013
Balance at beginning of period	506,289		523,756		538,202
Granted	207,575		168,254		167,095
Forfeited	(26,970	)	(18,171	)	(28,713	)
Earned and issued	(179,764	)	(167,550	)	(152,828	)
Balance at end of period	507,130		506,289		523,756

The following table represents the activity related to stock options during the periods indicated:

	Number of Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value (Dollars in thousands)		Weighted Average Remaining Contract Life (in years)
Outstanding options, December 31, 2012	1,236,075		$	51.48
Granted	75,722		52.36
Exercised	(200,748	)	40.35		$	2,740
Forfeited or expired	(38,220	)	55.87
Outstanding options, December 31, 2013	1,072,829		$	53.47
Granted	77,434		65.31
Exercised	(267,421	)	48.57		4,612
Forfeited or expired	(15,160	)	60.38
Outstanding options, December 31, 2014	867,682		$	55.92
Granted	82,001		62.50
Exercised	(119,917	)	51.71		1,516
Forfeited or expired	(15,989	)	66.52
Outstanding options, December 31, 2015	813,777		$	56.99	$	1,061	5.1
Exercisable options, December 31, 2013	707,934		53.54
Exercisable options, December 31, 2014	562,752		55.92
Exercisable options, December 31, 2015	546,842		$	56.54	$	665	3.9

Schedule of Stock Option Activity by Exercise Price Range

The following table represents weighted average remaining life as of December 31, 2015 for options outstanding within the stated exercise prices:

	Options Outstanding				Options Exercisable
Exercise Price Range Per Share	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Life	Number of Options	Weighted Average Exercise Price
$36.48 to $51.69	108,856	$	50.05	5.4 years	70,437	$	49.69
$51.70 to $52.88	170,627	52.34		6.5 years	86,365	52.34
$52.89 to $56.26	133,884	54.94		4.3 years	124,397	54.89
$56.27 to $59.04	121,591	57.53		1.2 years	119,855	57.52
$59.05 to $62.39	119,583	59.92		3.4 years	116,867	59.87
$62.40 to $111.71	159,236	65.83		8.2 years	28,921	75.41
Total options	813,777	$	56.99	5.1 years	546,842	$	56.54

Schedule of Valuation Assumptions

The following weighted-average assumptions were used for option awards issued during the years ended December 31:

	2015			2014			2013
Expected dividends	2.2		%	2.1		%	2.6		%
Expected volatility	35.6		%	35.8		%	34.8		%
Risk-free interest rate	2.0		%	2.3		%	1.7		%
Expected term (in years)	7.5			7.5			8.6
Weighted-average grant-date fair value	$	19.57		$	21.26		$	15.37

Schedule of Allocation for Share-based Compensation Expense

The following table indicates compensation expense recorded for phantom stock and performance units based on the number of share equivalents vested at December 31 of the years indicated and the current market price of the Company’s stock at that time:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to phantom stock and performance units	$	12,109	$	5,496	$	4,855

The following table represents the compensation expense that is included in non-interest expense and related income tax benefits in the accompanying consolidated statements of comprehensive income related to stock options for the years ended December 31:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to stock options	$	1,861	$	2,053	$	2,110
Income tax benefit related to stock options	317		375		379

The following table represents the compensation expense that was included in non-interest expense and related income tax benefits in the accompanying consolidated statements of comprehensive income related to restricted stock awards and restricted share units for the years ended December 31:

(Dollars in thousands)	2015		2014		2013
Compensation expense related to restricted stock awards and restricted share units	$	12,045	$	9,932	$	8,593
Income tax benefit related to restricted stock awards and restricted share units	4,215		3,476		3,008

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of Financial Instruments Outstanding

At December 31, the Company had the following financial instruments outstanding and related reserves, whose contract amounts represent credit risk:

(Dollars in thousands)	2015		2014
Commitments to grant loans	$	61,240	$	161,350
Unfunded commitments under lines of credit	4,617,802		4,007,954
Commercial and standby letters of credit	150,281		134,882
Reserve for unfunded lending commitments	14,145		11,801

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Financial Asset and Liabilities Measured at Fair Value on Recurring Basis

The Company has segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to estimate the fair value at the measurement date in the tables below. See Note 1, Summary of Significant Accounting Policies, for a description of how fair value measurements are determined.

	December 31, 2015
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Securities available for sale	$	—	$	2,800,286	$	—	$	2,800,286
Mortgage loans held for sale	—		166,247		—		166,247
Derivative instruments	—		30,486		—		30,486
Total	$	—	$	2,997,019	$	—	$	2,997,019
Liabilities
Derivative instruments	$	—	$	24,939	$	—	$	24,939
Total	$	—	$	24,939	$	—	$	24,939
	December 31, 2014
	Level 1		Level 2		Level3		Total
Assets
Securities available for sale	$	—	$	2,158,853	$	—	$	2,158,853
Mortgage loans held for sale	—		139,950		—		139,950
Derivative instruments	—		32,903		—		32,903
Total	$	—	$	2,331,706	$	—	$	2,331,706
Liabilities
Derivative instruments	$	—	$	31,354	$	—	$	31,354
Total	$	—	$	31,354	$	—	$	31,354

Gains and Losses Included in Earnings Related to Asset and Liabilities Measured at Fair Value on Recurring Basis

Gains and losses (realized and unrealized) included in earnings (or accumulated other comprehensive income) during 2015 related to assets and liabilities measured at fair value on a recurring basis are reported in non-interest income or other comprehensive income as follows:

(Dollars in thousands)	Non-interest income		Other comprehensive income
Total gains (losses) included in earnings	$	2,939	$	—
Change in unrealized gains (losses) relating to assets still held at December 31, 2015	—		(9,110		)

Financial Asset and Liabilities Measured at Fair Value on Nonrecurring Basis

The Company has segregated all financial assets and liabilities that are measured at fair value on a non-recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below.

	December 31, 2015
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
OREO, net	$	—	$	1,106	$	—	$	1,106
Total	$	—	$	1,106	$	—	$	1,106
	December 31, 2014
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
OREO, net	$	—	$	1,483	$	—	$	1,483
Total	$	—	$	1,483	$	—	$	1,483

Summary of Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance for Mortgage Loans Held for Sale

The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for mortgage loans held for sale measured at fair value:

	December 31, 2015						December 31, 2014
(Dollars in thousands)	Aggregate Fair Value		Aggregate Unpaid Principal		Aggregate Fair Value Less Unpaid Principal		Aggregate Fair Value		Aggregate Unpaid Principal		Aggregate Fair Value Less Unpaid Principal
Mortgage loans held for sale, at fair value	$	166,247	$	161,083	$	5,164	$	139,950	$	134,639	$	5,311

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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Estimated Fair Values and Carrying Amounts of Financial Instruments

The carrying amount and estimated fair values, as well as the level within the fair value hierarchy, of the Company’s financial instruments are included in the tables below. See Note 1, Summary of Significant Accounting Policies, for a description of how fair value measurements are determined.

	December 31, 2015
(Dollars in thousands)	Carrying  Amount		Fair Value		Level 1		Level 2		Level 3
Financial Assets
Cash and cash equivalents	$	510,267	$	510,267	$	510,267	$	—	$	—
Investment securities	2,899,214		2,901,247		—		2,901,247		—
Loans and loans held for sale, net of unearned income and allowance for loan losses	14,355,297		14,674,749		—		166,247		14,508,502
FDIC loss share receivables	39,878		9,163		—		—		9,163
Derivative instruments	30,486		30,486		—		30,486		—
Financial Liabilities
Deposits	$	16,178,748	$	15,696,245	$	—	$	—	$	15,696,245
Short-term borrowings	326,617		326,617		326,617		—		—
Long-term debt	340,447		309,847		—		—		309,847
Derivative instruments	24,939		24,939		—		24,939		—
	December 31, 2014
(Dollars in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial Assets
Cash and cash equivalents	$	548,095	$	548,095	$	548,095	$	—	$	—
Investment securities	2,275,813		2,278,334		—		2,278,334		—
Loans and loans held for sale, net of unearned income and allowance for loan losses	11,450,985		11,475,315		—		139,950		11,335,365
FDIC loss share receivables	69,627		19,606		—		—		19,606
Derivative instruments	32,903		32,903		—		32,903		—
Financial Liabilities
Deposits	$	12,520,525	$	12,298,017	$	—	$	—	$	12,298,017
Short-term borrowings	845,742		845,742		845,742		—		—
Long-term debt	403,254		376,139		—		—		376,139
Derivative instruments	31,354		31,354		—		31,354		—

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Business Segments (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

	Year Ended December 31, 2015
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	639,793		$	7,062		$	3		$	646,858
Interest expense	56,222			2,878			—			59,100
Net interest income	583,571			4,184			3			587,758
Provision for loan losses	30,908			—			—			30,908
Mortgage income	1,426			79,696			—			81,122
Title revenue	—			—			22,837			22,837
Other non-interest income	116,443			(2		)	(7		)	116,434
Allocated expenses	(16,253		)	12,036			4,217			—
Non-interest expense	495,158			57,784			17,363			570,305
Income before income tax expense	191,627			14,058			1,253			206,938
Income tax expense	58,006			5,581			507			64,094
Net income	$	133,621		$	8,477		$	746		$	142,844
Total loans and loans held for sale, net of unearned income	$	14,305,663		$	188,012		$	—		$	14,493,675
Total assets	19,220,085			256,888			27,095			19,504,068
Total deposits	16,173,831			4,917			—			16,178,748
Average assets	18,146,216			230,819			25,671			18,402,706

	Year Ended December 31, 2014
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	498,820		$	5,992		$	3		$	504,815
Interest expense	42,983			1,721			—			44,704
Net interest income	455,837			4,271			3			460,111
Provision for loan losses	18,966			94			—			19,060
Mortgage income	71			51,726			—			51,797
Title revenue	—			—			20,492			20,492
Other non-interest income	101,401			(61		)	(1		)	101,339
Allocated expenses	(11,602		)	8,203			3,399			—
Non-interest expense	412,165			44,761			16,688			473,614
Income before income tax expense	137,780			2,878			407			141,065
Income tax expense	34,352			1,148			183			35,683
Net income	$	103,428		$	1,730		$	224		$	105,382
Total loans and loans held for sale, net of unearned income	$	11,415,973		$	165,143		$	—		$	11,581,116
Total assets	15,537,731			194,156			26,017			15,757,904
Total deposits	12,515,329			5,196			—			12,520,525
Average assets	14,430,768			176,003			25,223			14,631,994

	Year Ended December 31, 2013
(Dollars in thousands)	IBERIABANK			IMC			LTC		Consolidated
Interest and dividend income	$	431,418		$	5,747		$	32	$	437,197
Interest expense	45,150			1,803			—		46,953
Net interest income	386,268			3,944			32		390,244
Provision for loan losses	5,123			22			—		5,145
Mortgage income	2			64,195			—		64,197
Title revenue	—			—			20,526		20,526
Other non-interest income	84,243			(10		)	2		84,235
Allocated expenses	(7,453		)	5,417			2,036		—
Non-interest expense	406,380			49,723			16,693		472,796
Income before income tax expense	66,463			12,967			1,831		81,261
Income tax expense	10,299			5,093			741		16,133
Net income	$	56,164		$	7,874		$	1,090	$	65,128
Total loans and loans held for sale, net of unearned income	$	9,472,908		$	147,553		$	—	$	9,620,461
Total assets	13,167,162			173,131			25,257		13,365,550
Total deposits	10,734,030			2,970			—		10,737,000
Average assets	12,794,997			183,513			25,478		13,003,988

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Condensed Parent Company Only Financial Statements (Tables)

12 Months Ended

Dec. 31, 2015

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Balance Sheets

Condensed Balance Sheets

(Dollars in thousands)	December 31
	2015		2014
Assets
Cash in bank	$	154,298	$	36,064
Investments in subsidiaries	2,449,325		1,841,420
Other assets	54,454		119,493
	$	2,658,077	$	1,996,977
Liabilities and Shareholders’ Equity
Liabilities	$	159,242	$	144,829
Shareholders’ equity	2,498,835		1,852,148
	$	2,658,077	$	1,996,977

Condensed Statements of Income

Condensed Statements of Income

	Year Ended December 31
(Dollars in thousands)	2015			2014			2013
Operating income
Dividends from bank subsidiary	$	—		$	—		$	49,000
Dividends from non-bank subsidiaries	—			—			1,511
Reimbursement of management expenses	59,255			46,433			34,474
Other income	(329		)	437			869
Total operating income	58,926			46,870			85,854
Operating expenses
Interest expense	3,393			3,224			3,232
Salaries and employee benefits expense	41,689			31,981			29,159
Other expenses	17,492			14,576			13,651
Total operating expenses	62,574			49,781			46,042
Income (loss) before income tax benefit and increase in equity in undistributed earnings of subsidiaries	(3,648		)	(2,911		)	39,812
Income tax expense (benefit)	800			(518		)	(2,808		)
Income (loss) before equity in undistributed earnings of subsidiaries	(4,448		)	(2,393		)	42,620
Equity in undistributed earnings of subsidiaries	147,292			107,775			22,508
Net income	$	142,844		$	105,382		$	65,128

Condensed Statements of Cash Flows

Condensed Statements of Cash Flows

(Dollars in thousands)	Year Ended December 31
	2015			2014			2013
Cash Flow from Operating Activities
Net income	$	142,844		$	105,382		$	65,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	416			595			2,035
Net income of subsidiaries	(147,292		)	(107,775		)	(73,044		)
Share-based compensation cost	13,906			11,985			10,703
Gain on sale of assets	(110		)	—			—
Tax benefit associated with share-based payment arrangements	(580		)	(2,105		)	(886		)
Other, net	82,105			(27,274		)	7,575
Net Cash Provided by (Used in) Operating Activities	91,289			(19,192		)	11,511
Cash Flow from Investing Activities
Cash paid in excess of cash received for acquisitions	(5,054		)	4,783			—
Proceeds from sale of premises and equipment	12			—			11,751
Purchases of premises and equipment	(2		)	(36		)	(5,247		)
Return of capital from (Capital contributed to) subsidiary	5,000			(14,600		)	—
Dividends received from subsidiaries	—			—			50,511
Net Cash (Used in) Provided by Investing Activities	(44		)	(9,853		)	57,015
Cash Flow from Financing Activities
Cash dividends paid on common stock	(52,318		)	(43,070		)	(40,332		)
Proceeds from common stock transactions	5,535			11,693			8,101
Payments to repurchase common stock	(3,620		)	(3,727		)	(2,280		)
Net proceeds from issuance of preferred stock	76,812			—			—
Tax benefit associated with share-based payment arrangements	580			2,105			886
Net Cash Provided by (Used In) Financing Activities	26,989			(32,999		)	(33,625		)
Net Increase (Decrease) in Cash and Cash Equivalents	118,234			(62,044		)	34,901
Cash and Cash Equivalents at Beginning of Period	36,064			98,108			63,207
Cash and Cash Equivalents at End of Period	$	154,298		$	36,064		$	98,108

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Summary of Significant Accounting Policies (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 acquisition	Dec. 31, 2020 acquisition	Dec. 31, 2019 acquisition	Dec. 31, 2016 acquisition	Dec. 31, 2015 USD ($) State acquisition $ / shares	Dec. 31, 2014 USD ($) acquisition
Schedule Of Significant Accounting Policies
Past due status period					30 days
Number of days due to be considered for accrual interest on loans discontinued					90 days
Maximum loss exposure related to unconsolidated VIE's					$ 160,000	$ 151,000
Fair value adjustment period following acquisition (in years)					1 year
Cash and cash equivalents maturity period (in years, less than)					3 months
Rate lock period (in days)					60 days
Property write-downs					$ 4,000	3,800
Other assets					$ 650,907	588,699
Past due loans threshold period					120 days
Additional provision expense, effect of change in method					$ 10,000
Additional provision expense, effect of change in method, (usd per share) | $ / shares					$ 0.17
Software and Software Development Costs
Schedule Of Significant Accounting Policies
Other assets					$ 6,200	7,900
Minimum | Buildings
Schedule Of Significant Accounting Policies
Weighted average useful life (in years)					10 years
Minimum | Furniture, Fixtures and Equipment
Schedule Of Significant Accounting Policies
Weighted average useful life (in years)					3 years
Maximum | Customer Relationship Intangible Asset
Schedule Of Significant Accounting Policies
Amortized intangible assets average life (in years)					10 years
Maximum | Buildings
Schedule Of Significant Accounting Policies
Weighted average useful life (in years)					40 years
Maximum | Furniture, Fixtures and Equipment
Schedule Of Significant Accounting Policies
Weighted average useful life (in years)					15 years
Weighted Average | Software and Software Development Costs
Schedule Of Significant Accounting Policies
Weighted average useful life (in years)					3 years
IBERIABANK Corporation
Schedule Of Significant Accounting Policies
Number of operating states | State					7
Other assets					$ 54,454	$ 119,493
IMC
Schedule Of Significant Accounting Policies
Number of operating states | State					10
Excluding Single Family
Schedule Of Significant Accounting Policies
Number of acquisitions where FDIC loan loss reimbursable period Is ending | acquisition					1	3
Forecast | Excluding Single Family
Schedule Of Significant Accounting Policies
Number of acquisitions where FDIC loan loss reimbursable period Is ending | acquisition				2
Forecast | Single Family
Schedule Of Significant Accounting Policies
Number of acquisitions where FDIC loan loss reimbursable period Is ending | acquisition	2	1	3
Commercial Loans
Schedule Of Significant Accounting Policies
Past due loans threshold period					90 days
Residential and Consumer Portfolio Segment [Member]
Schedule Of Significant Accounting Policies
Period to evaluate loans for charge-off					120 days

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Acquisition Activity (Detail) $ / shares in Units, $ in Thousands				12 Months Ended
	May. 31, 2015 USD ($) Branch shares	Mar. 31, 2015 USD ($) Branch shares	Feb. 28, 2015 USD ($) Branch $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition
Goodwill				$ 724,603	$ 517,526
Maximum period for subject to change estimated fair values after acquisition date (in years)				1 year
Florida Bank Group, Inc.
Business Acquisition
Cash received per share | $ / shares			$ 7.81
Shares received | shares			0.149
Total consideration paid			$ 90,485
Goodwill			$ 15,704
Number of bank offices | Branch			12
Old Florida Bancshares, Inc.
Business Acquisition
Shares received | shares		0.34
Total consideration paid		$ 253,152
Goodwill		$ 99,638
Number of bank offices | Branch		14
Georgia Commerce Bancshares Inc.
Business Acquisition
Shares received | shares	0.6134
Total consideration paid	$ 190,264
Goodwill	$ 87,319
Number of bank offices | Branch	9

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Acquisition Activity - Schedule of Business Acquisitions (Detail) - USD ($) $ in Thousands				12 Months Ended
	May. 31, 2015	Mar. 31, 2015	Feb. 28, 2015	Dec. 31, 2014	Dec. 31, 2015
Non-Equity consideration
Goodwill				$ 517,526	$ 724,603
Florida Bank Group, Inc.
Equity consideration
Common stock issued (shares)			752,493
Total equity consideration			$ 47,497
Non-Equity consideration
Cash			42,988
Total consideration paid			90,485
Net assets acquired			74,781
Goodwill			$ 15,704
Old Florida Bancshares, Inc.
Equity consideration
Common stock issued (shares)		3,839,554
Total equity consideration		$ 242,007
Non-Equity consideration
Cash		11,145
Total consideration paid		253,152
Net assets acquired		153,514
Goodwill		$ 99,638
Georgia Commerce Bancshares Inc.
Equity consideration
Common stock issued (shares)	2,882,357
Total equity consideration	$ 185,249
Non-Equity consideration
Cash	5,015
Total consideration paid	190,264
Net assets acquired	102,945
Goodwill	$ 87,319
Trust One Bank - Memphis
Non-Equity consideration
Total consideration paid				0
Net assets acquired				(8,596)
Goodwill				8,596
Teche Holding Company
Non-Equity consideration
Total consideration paid				156,740
Net assets acquired				76,311
Goodwill				80,429
First Private Holdings, Inc.
Non-Equity consideration
Total consideration paid				58,640
Net assets acquired				32,387
Goodwill				$ 26,253

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Acquisition Activity - Schedule of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	May. 31, 2015	Mar. 31, 2015	Feb. 28, 2015
Florida Bank Group, Inc.
Assets
Cash and cash equivalents	$ 72,982				$ 72,982
Investment securities	107,372				107,236
Loans	307,531				312,902
Other real estate owned	423				498
Core deposit intangible	4,489				0
Deferred tax asset, net	28,458				19,889
Other assets	20,868				29,817
Total Assets	542,123				543,324
Liabilities
Interest-bearing deposits	282,680				282,417
Non-interest-bearing deposits	109,548				109,548
Borrowings	68,598				60,000
Other liabilities	6,516				1,898
Total Liabilities	467,342				453,863
Florida Bank Group, Inc. | Preliminary Fair Value Adjustment
Assets
Cash and cash equivalents					0
Investment securities					136
Loans					(5,371)
Other real estate owned					(75)
Core deposit intangible					4,489
Deferred tax asset, net					8,569
Other assets					(8,949)
Total Assets					(1,201)
Liabilities
Interest-bearing deposits					263
Non-interest-bearing deposits					0
Borrowings					8,598
Other liabilities					4,618
Total Liabilities					$ 13,479
Old Florida Bancshares, Inc.
Assets
Cash and cash equivalents	360,688			$ 360,688
Investment securities	67,209			67,209
Loans held for sale	5,952			5,952
Loans	1,062,951			1,073,773
Other real estate owned	5,964			4,515
Core deposit intangible	6,821			0
Deferred tax asset, net	15,017			10,629
Other assets	23,311			30,549
Total Assets	1,547,913			1,553,315
Liabilities
Interest-bearing deposits	1,048,888			1,048,765
Non-interest-bearing deposits	340,869			340,869
Borrowings	1,528			1,528
Other liabilities	3,114			3,038
Total Liabilities	1,394,399			1,394,200
Old Florida Bancshares, Inc. | Preliminary Fair Value Adjustment
Assets
Cash and cash equivalents				0
Investment securities				0
Loans held for sale				0
Loans				(10,822)
Other real estate owned				1,449
Core deposit intangible				6,821
Deferred tax asset, net				4,388
Other assets				(7,238)
Total Assets				(5,402)
Liabilities
Interest-bearing deposits				123
Non-interest-bearing deposits				0
Borrowings				0
Other liabilities				76
Total Liabilities				$ 199
Georgia Commerce Bancshares Inc.
Assets
Cash and cash equivalents	51,059		$ 51,059
Investment securities	134,904		135,710
Loans held for sale	1,249		1,249
Loans	792,120		807,726
Other real estate owned	5,588		9,795
Core deposit intangible	6,720		0
Deferred tax asset, net	10,482		5,031
Other assets	28,295		28,952
Total Assets	1,030,417		1,039,522
Liabilities
Interest-bearing deposits	658,309		658,133
Non-interest-bearing deposits	249,739		249,739
Borrowings	13,203		13,203
Other liabilities	6,221		6,221
Total Liabilities	$ 927,472		$ 927,296
Georgia Commerce Bancshares Inc. | Preliminary Fair Value Adjustment
Assets
Cash and cash equivalents		$ 0
Investment securities		(806)
Loans held for sale		0
Loans		(15,606)
Other real estate owned		(4,207)
Core deposit intangible		6,720
Deferred tax asset, net		5,451
Other assets		(657)
Total Assets		(9,105)
Liabilities
Interest-bearing deposits		176
Non-interest-bearing deposits		0
Borrowings		0
Other liabilities		0
Total Liabilities		$ 176

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Acquisition Activity - Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Interest and non-interest income	$ 803,722	$ 699,308
Net income	$ 172,554	$ 69,625
Earnings per share - basic (in usd per share)	$ 4.39	$ 1.88
Earnings per share - diluted (in usd per share)	$ 4.38	$ 1.88

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Investment Securities - Schedule of Amortized Cost and Fair Values of Investment Securities, with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities
Amortized cost	$ 2,803,430	$ 2,147,276
Gross unrealized gain	15,477	22,296
Gross unrealized losses	(18,621)	(10,719)
Estimated fair value	2,800,286	2,158,853
Schedule of Held-to-maturity Securities
Amortized cost	98,928	116,960
Gross unrealized gains	2,910	3,392
Gross unrealized losses	(877)	(871)
Estimated fair value	100,961	119,481
Fair value of securities held as collateral	1,400,000	1,400,000
U.S. Government-Sponsored Enterprise Obligations
Schedule of Available-for-sale Securities
Amortized cost	252,514	317,386
Gross unrealized gain	1,161	1,700
Gross unrealized losses	(1,592)	(3,533)
Estimated fair value	252,083	315,553
Schedule of Held-to-maturity Securities
Amortized cost		10,000
Gross unrealized gains		88
Gross unrealized losses		0
Estimated fair value		10,088
Obligations of State and Political Subdivisions
Schedule of Available-for-sale Securities
Amortized cost	182,541	86,513
Gross unrealized gain	5,429	3,679
Gross unrealized losses	(9)	(2)
Estimated fair value	187,961	90,190
Schedule of Held-to-maturity Securities
Amortized cost	69,979	77,597
Gross unrealized gains	2,803	3,153
Gross unrealized losses	(101)	(145)
Estimated fair value	72,681	80,605
Mortgage-Backed Securities
Schedule of Available-for-sale Securities
Amortized cost	2,272,879	1,741,917
Gross unrealized gain	8,457	16,882
Gross unrealized losses	(16,523)	(7,184)
Estimated fair value	2,264,813	1,751,615
Schedule of Held-to-maturity Securities
Amortized cost	28,949	29,363
Gross unrealized gains	107	151
Gross unrealized losses	(776)	(726)
Estimated fair value	28,280	28,788
Other Securities
Schedule of Available-for-sale Securities
Amortized cost	95,496	1,460
Gross unrealized gain	430	35
Gross unrealized losses	(497)	0
Estimated fair value	$ 95,429	$ 1,495

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Investment Securities - Schedule of Securities with Gross Unrealized Losses Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Gross Unrealized Losses
Less than twelve months	$ (13,448)	$ (1,191)
Over twelve months	(5,173)	(9,528)
Total	(18,621)	(10,719)
Estimated Fair Value
Less than twelve months	1,515,493	304,871
Over twelve months	213,830	535,047
Total	1,729,323	839,918
Gross Unrealized Losses
Less than twelve months	(54)	(9)
Over twelve months	(823)	(862)
Total	(877)	(871)
Estimated Fair Value
Less than twelve months	5,529	2,287
Over twelve months	21,735	29,402
Total	27,264	31,689
U.S. Government-Sponsored Enterprise Obligations
Gross Unrealized Losses
Less than twelve months	(1,214)	0
Over twelve months	(378)	(3,533)
Total	(1,592)	(3,533)
Estimated Fair Value
Less than twelve months	177,839	0
Over twelve months	28,116	240,498
Total	205,955	240,498
Obligations of State and Political Subdivisions
Gross Unrealized Losses
Less than twelve months	(9)	(2)
Over twelve months	0	0
Total	(9)	(2)
Estimated Fair Value
Less than twelve months	5,765	185
Over twelve months	0	0
Total	5,765	185
Mortgage-Backed Securities
Gross Unrealized Losses
Less than twelve months	(11,737)	(1,189)
Over twelve months	(4,786)	(5,995)
Total	(16,523)	(7,184)
Estimated Fair Value
Less than twelve months	1,279,914	304,686
Over twelve months	185,215	294,549
Total	1,465,129	599,235
Other Securities
Gross Unrealized Losses
Less than twelve months	(488)
Over twelve months	(9)
Total	(497)
Estimated Fair Value
Less than twelve months	51,975
Over twelve months	499
Total	52,474
Obligations of State and Political Subdivisions
Gross Unrealized Losses
Less than twelve months	(9)	(9)
Over twelve months	(92)	(136)
Total	(101)	(145)
Estimated Fair Value
Less than twelve months	1,999	2,287
Over twelve months	4,162	8,590
Total	6,161	10,877
Mortgage-Backed Securities
Gross Unrealized Losses
Less than twelve months	(45)	0
Over twelve months	(731)	(726)
Total	(776)	(726)
Estimated Fair Value
Less than twelve months	3,530	0
Over twelve months	17,573	20,812
Total	$ 21,103	$ 20,812

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Investment Securities - Additional Information on Securities in a Continuous Loss Position (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) securities Security	Dec. 31, 2014 USD ($) securities Security
Schedule of Available-for-sale Securities
Number of debt securities with unrealized losses | Security	252	112
Debt securities with unrealized losses (percentage of amortized cost)	1.10%	1.31%
Number of securities | securities	43	71
Amortized cost basis	$ 241,561	$ 574,840
Unrealized loss	$ 5,996	$ 10,390
Fannie Mae, Freddie Mac, or Ginnie Mae
Schedule of Available-for-sale Securities
Number of securities | securities	40	66
Amortized cost basis	$ 236,800	$ 566,113
Unrealized loss	$ 5,895	$ 10,254
Political Subdivisions
Schedule of Available-for-sale Securities
Number of securities | securities	2	5
Amortized cost basis	$ 4,253	$ 8,727
Unrealized loss	$ 92	$ 136
Other
Schedule of Available-for-sale Securities
Number of securities | securities	1	0
Amortized cost basis	$ 508	$ 0
Unrealized loss	$ 9	$ 0

XML

Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Weighted Average Yield
Within one year or less	2.02%
One through five years	1.72%
After five through ten years	2.31%
Over ten years	2.14%
Weighted average yield	2.12%
Amortized Cost
Within one year or less	$ 14,360
One through five years	318,423
After five through ten years	501,217
Over ten years	1,969,430
Amortized cost	2,803,430
Estimated Fair Value
Within one year or less	14,373
One through five years	318,718
After five through ten years	506,856
Over ten years	1,960,339
Estimated fair value	$ 2,800,286	$ 2,158,853
Weighted Average Yield
Within one year or less	3.83%
One through five years	3.06%
After five through ten years	2.89%
Over ten years	2.91%
Weighted average yield	2.93%
Amortized Cost
Within one year or less	$ 75
One through five years	13,627
After five through ten years	16,278
Over ten years	68,948
Amortized cost	98,928	116,960
Estimated Fair Value
Within one year or less	75
One through five years	13,989
After five through ten years	16,914
Over ten years	69,983
Estimated fair value	$ 100,961	$ 119,481

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Investment Securities - Schedule of Realized Gains and Losses from Sale of Securities Classified as Available for Sale (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Realized gains	$ 1,834	$ 863	$ 2,387
Realized losses	(259)	(92)	(110)
Net realized gains (losses)	$ 1,575	$ 771	$ 2,277

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Investment Securities - Schedule of Securities in Other Assets on Company's Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Federal Home Loan Bank (FHLB) stock	$ 16,265	$ 38,476
Federal Reserve Bank (FRB) stock	48,584	34,348
Other investments	1,159	1,306
Total	$ 66,008	$ 74,130

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Loans - Schedule of Non-Covered Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	$ 14,098,211	$ 10,996,500
Total loans, net of unearned income	14,327,428	11,441,044
Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	10,198,855	7,814,082
Commercial Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	6,073,511	4,361,779
Commercial Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	3,444,578	2,571,695
Commercial Loans | Energy-Related
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	680,766	880,608
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	1,195,319	1,080,297
Residential Mortgage | Residential 1-4 Family
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	1,112,282	1,048,241
Residential Mortgage | Construction / Owner Occupied
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	83,037	32,056
Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	2,933,254	2,546,665
Consumer and Other Loans | Home Equity
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	2,066,167	1,601,105
Consumer and Other Loans | Indirect Automobile
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	246,298	397,158
Consumer and Other Loans | Other
Accounts, Notes, Loans and Financing Receivable
Total loans, net of unearned income	620,789	548,402
Legacy Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	11,190,520	9,668,714
Legacy Loans | Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	8,133,341	7,002,198
Legacy Loans | Commercial Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	4,504,062	3,676,811
Legacy Loans | Commercial Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	2,952,102	2,452,521
Legacy Loans | Commercial Loans | Energy-Related
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	677,177	872,866
Legacy Loans | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	694,023	527,694
Legacy Loans | Residential Mortgage | Residential 1-4 Family
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	610,986	495,638
Legacy Loans | Residential Mortgage | Construction / Owner Occupied
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	83,037	32,056
Legacy Loans | Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	2,363,156	2,138,822
Legacy Loans | Consumer and Other Loans | Home Equity
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	1,575,643	1,290,976
Legacy Loans | Consumer and Other Loans | Indirect Automobile
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	246,214	396,766
Legacy Loans | Consumer and Other Loans | Other
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	541,299	451,080
Acquired Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	3,136,908	1,772,330
Acquired Loans | Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	2,065,514	811,884
Acquired Loans | Commercial Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	1,569,449	684,968
Acquired Loans | Commercial Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	492,476	119,174
Acquired Loans | Commercial Loans | Energy-Related
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	3,589	7,742
Acquired Loans | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	501,296	552,603
Acquired Loans | Residential Mortgage | Residential 1-4 Family
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	501,296	552,603
Acquired Loans | Residential Mortgage | Construction / Owner Occupied
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	0	0
Acquired Loans | Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	570,098	407,843
Acquired Loans | Consumer and Other Loans | Home Equity
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	490,524	310,129
Acquired Loans | Consumer and Other Loans | Indirect Automobile
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	84	392
Acquired Loans | Consumer and Other Loans | Other
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	$ 79,490	$ 97,322

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Loans (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) bank	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable
Failed banks acquired | bank	6
Covered loans receivable	$ 229,217	$ 444,544
Deferred loan origination fees	18,700	11,200
Deposit liabilities reclassified as loans receivable	5,100	5,600
Loans with carrying value pledged to secure public deposits and other borrowings	3,900,000	3,100,000
Carrying amounts of loans acquired	2,200,000
Loans accounted for under ASC Topics 310-10 and 310-20	2,100,000
Basis in acquired loans at acquisition	57,755
Acquired Impaired Loans
Accounts, Notes, Loans and Financing Receivable
Basis in acquired loans at acquisition	57,800
Troubled Debt Restructurings
Accounts, Notes, Loans and Financing Receivable
Total TDRs	57,000	0
Covered Loan
Accounts, Notes, Loans and Financing Receivable
Covered loans receivable	229,200	444,500
Residential Mortgage and Home Equity | Covered Loan
Accounts, Notes, Loans and Financing Receivable
Covered loans receivable	$ 191,700	$ 220,500

XML

Loans - Schedule of Aging of Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable
Discount / Premium	$ 18,700	$ 11,200
Non-covered loans, net of unearned income	$ 14,098,211	10,996,500
Past due loans threshold period	120 days
Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Past due loans threshold period	90 days
Legacy Loans
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	$ 13,839	23,365
Past due, 60-89 days	6,270	6,202
Past due, greater than 90 days	51,552	35,724
Total past due	71,661	65,291
Current	11,118,859	9,603,423
Non-covered loans, net of unearned income	11,190,520	9,668,714
Recorded investment, greater than 90 days and accruing	$ 624	754
Past due loans threshold period	90 days
Legacy Loans | Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	$ 8,133,341	7,002,198
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	801	507
Past due, 60-89 days	0	0
Past due, greater than 90 days	120	69
Total past due	921	576
Current	635,560	483,663
Non-covered loans, net of unearned income	636,481	484,239
Recorded investment, greater than 90 days and accruing	0	0
Legacy Loans | Commercial Loans | Commercial Real Estate - Other
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	2,687	11,799
Past due, 60-89 days	793	148
Past due, greater than 90 days	15,517	6,859
Total past due	18,997	18,806
Current	3,848,584	3,173,766
Non-covered loans, net of unearned income	3,867,581	3,192,572
Recorded investment, greater than 90 days and accruing	95	0
Legacy Loans | Commercial Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	1,208	1,589
Past due, 60-89 days	739	1,860
Past due, greater than 90 days	6,746	3,225
Total past due	8,693	6,674
Current	2,943,409	2,445,847
Non-covered loans, net of unearned income	2,952,102	2,452,521
Recorded investment, greater than 90 days and accruing	87	200
Legacy Loans | Commercial Loans | Energy-Related
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	15	0
Past due, 60-89 days	0	0
Past due, greater than 90 days	7,081	27
Total past due	7,096	27
Current	670,081	872,839
Non-covered loans, net of unearned income	677,177	872,866
Recorded investment, greater than 90 days and accruing	0	0
Legacy Loans | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	694,023	527,694
Legacy Loans | Residential Mortgage | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	1,075	1,389
Past due, 60-89 days	2,485	2,616
Past due, greater than 90 days	14,116	14,900
Total past due	17,676	18,905
Current	676,347	508,789
Non-covered loans, net of unearned income	694,023	527,694
Recorded investment, greater than 90 days and accruing	442	538
Legacy Loans | Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	2,363,156	2,138,822
Legacy Loans | Consumer and Other Loans | Consumer - Home Equity
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	3,549	4,096
Past due, 60-89 days	870	595
Past due, greater than 90 days	5,628	7,420
Total past due	10,047	12,111
Current	1,565,596	1,278,865
Non-covered loans, net of unearned income	1,575,643	1,290,976
Recorded investment, greater than 90 days and accruing	0	16
Legacy Loans | Consumer and Other Loans | Consumer - Indirect Automobile
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	2,187	2,447
Past due, 60-89 days	518	396
Past due, greater than 90 days	1,181	1,419
Total past due	3,886	4,262
Current	242,328	392,504
Non-covered loans, net of unearned income	246,214	396,766
Recorded investment, greater than 90 days and accruing	0	0
Legacy Loans | Consumer and Other Loans | Consumer - Credit Card
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	394	253
Past due, 60-89 days	113	163
Past due, greater than 90 days	394	1,032
Total past due	901	1,448
Current	76,360	71,297
Non-covered loans, net of unearned income	77,261	72,745
Recorded investment, greater than 90 days and accruing	0	0
Legacy Loans | Consumer and Other Loans | Consumer - Other
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	1,923	1,285
Past due, 60-89 days	752	424
Past due, greater than 90 days	769	773
Total past due	3,444	2,482
Current	460,594	375,853
Non-covered loans, net of unearned income	464,038	378,335
Recorded investment, greater than 90 days and accruing	0	0
Acquired Loans
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	9,039	14,814
Past due, 60-89 days	6,431	6,760
Past due, greater than 90 days	104,843	135,670
Total past due	120,313	157,244
Current	3,137,451	1,751,170
Discount / Premium	(120,856)	(136,084)
Non-covered loans, net of unearned income	3,136,908	1,772,330
Recorded investment, greater than 90 days and accruing	99,422	133,804
Acquired Loans | Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	2,065,514	811,884
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	216	2,740
Past due, 60-89 days	117	57
Past due, greater than 90 days	6,994	8,225
Total past due	7,327	11,022
Current	120,467	64,393
Discount / Premium	(2,368)	(4,482)
Non-covered loans, net of unearned income	125,426	70,933
Recorded investment, greater than 90 days and accruing	6,994	8,225
Acquired Loans | Commercial Loans | Commercial Real Estate - Other
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	4,295	4,986
Past due, 60-89 days	2,024	3,330
Past due, greater than 90 days	53,558	67,302
Total past due	59,877	75,618
Current	1,434,966	588,947
Discount / Premium	(50,820)	(50,530)
Non-covered loans, net of unearned income	1,444,023	614,035
Recorded investment, greater than 90 days and accruing	52,067	67,198
Acquired Loans | Commercial Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	1,016	2,118
Past due, 60-89 days	1,276	70
Past due, greater than 90 days	6,829	4,528
Total past due	9,121	6,716
Current	490,255	119,472
Discount / Premium	(6,900)	(7,014)
Non-covered loans, net of unearned income	492,476	119,174
Recorded investment, greater than 90 days and accruing	5,674	4,528
Acquired Loans | Commercial Loans | Energy-Related
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	0	0
Past due, 60-89 days	0	0
Past due, greater than 90 days	1,368	11
Total past due	1,368	11
Current	2,221	7,731
Discount / Premium	0	0
Non-covered loans, net of unearned income	3,589	7,742
Recorded investment, greater than 90 days and accruing	1,198	11
Acquired Loans | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	501,296	552,603
Acquired Loans | Residential Mortgage | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	73	324
Past due, 60-89 days	1,806	2,788
Past due, greater than 90 days	22,873	30,804
Total past due	24,752	33,916
Current	506,103	559,180
Discount / Premium	(29,559)	(40,493)
Non-covered loans, net of unearned income	501,296	552,603
Recorded investment, greater than 90 days and accruing	21,765	29,553
Acquired Loans | Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered loans, net of unearned income	570,098	407,843
Acquired Loans | Consumer and Other Loans | Consumer - Home Equity
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	2,859	3,165
Past due, 60-89 days	997	385
Past due, greater than 90 days	12,525	22,800
Total past due	16,381	26,350
Current	503,635	315,788
Discount / Premium	(29,492)	(32,009)
Non-covered loans, net of unearned income	490,524	310,129
Recorded investment, greater than 90 days and accruing	11,234	22,409
Acquired Loans | Consumer and Other Loans | Consumer - Indirect Automobile
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	0	13
Past due, 60-89 days	0	17
Past due, greater than 90 days	12	9
Total past due	12	39
Current	72	393
Discount / Premium	0	(40)
Non-covered loans, net of unearned income	84	392
Recorded investment, greater than 90 days and accruing	12	9
Acquired Loans | Consumer and Other Loans | Consumer - Credit Card
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	0	10
Past due, 60-89 days	0	0
Past due, greater than 90 days	17	24
Total past due	17	34
Current	565	614
Discount / Premium	0	0
Non-covered loans, net of unearned income	582	648
Recorded investment, greater than 90 days and accruing	17	24
Acquired Loans | Consumer and Other Loans | Consumer - Other
Accounts, Notes, Loans and Financing Receivable
Past due, 30-59 days	580	1,458
Past due, 60-89 days	211	113
Past due, greater than 90 days	667	1,967
Total past due	1,458	3,538
Current	79,167	94,652
Discount / Premium	(1,717)	(1,516)
Non-covered loans, net of unearned income	78,908	96,674
Recorded investment, greater than 90 days and accruing	$ 461	$ 1,847

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Loans - Schedule of Legacy Loans on Nonaccrual Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	$ 50,928	$ 34,970
Interest income if non-accrual loans had been current	2,100	1,800	$ 2,900
Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	120	69
Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	15,422	6,859
Commercial Loans | Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	6,659	3,025
Commercial Loans | Energy-Related
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	7,081	27
Residential Mortgage | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	13,674	14,362
Consumer and Other Loans | Consumer - Home Equity
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	5,628	7,404
Consumer and Other Loans | Consumer - Indirect Automobile
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	1,181	1,419
Consumer and Other Loans | Consumer - Credit Card
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	394	1,032
Consumer and Other Loans | Consumer - Other
Financing Receivable, Recorded Investment, Past Due
Total loans on nonaccrual status	$ 769	$ 773

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Loans - Schedule of Carrying Amount of Loans Acquired (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable
Contractually required principal and interest at acquisition	$ 76,445
Expected losses and foregone interest	(11,867)
Cash flows expected to be collected at acquisition	64,578
Accretable yield	(6,823)
Fair value of acquired loans at acquisition	57,755
Carrying amounts of loans acquired	2,200,000
Loans accounted for under ASC Topics 310-10 and 310-20	2,100,000
ASC Topic 310-30
Accounts, Notes, Loans and Financing Receivable
Contractually required principal and interest at acquisition	2,384,114
Expected losses and foregone interest	(15,539)
Cash flows expected to be collected at acquisition	2,368,575
Fair value of acquired loans at acquisition	2,105,466
Florida Bank Group, Inc.
Accounts, Notes, Loans and Financing Receivable
Acquired loans	300,000
Old Florida Bancshares, Inc.
Accounts, Notes, Loans and Financing Receivable
Acquired loans	1,100,000
Georgia Commerce Bancshares Inc.
Accounts, Notes, Loans and Financing Receivable
Acquired loans	800,000
Acquired Impaired Loans
Accounts, Notes, Loans and Financing Receivable
Fair value of acquired loans at acquisition	$ 57,800

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Loans - Summary of Changes in Accretable Yields of Acquired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Balance at beginning of period	$ 287,651	$ 354,892	$ 356,393
Additions	6,823	13,848	0
Transfers from non-accretable difference to accretable yield	9,916	25,844	50,743
Accretion	(80,479)	(103,233)	(179,456)
Changes in expected cash flows not affecting non-accretable differences	3,591	(3,700)	127,212
Balance at end of period	$ 227,502	$ 287,651	$ 354,892

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Loans - Schedule of Modified TDRs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications
Extended maturities	$ 15,594
Interest rate adjustment	0
Maturity and interest rate adjustment	23,374
Movement to or extension of interest-rate only payments	241
Forbearance	122
Other concession(s)	17,710
Total	57,041
Troubled Debt Restructurings
Financing Receivable, Modifications
Total TDRs	57,000	$ 0
TDRs in accrual status	34,500
TDRs in non-accrual status	$ 22,500

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Loans - Schedule of Subsequently Defaulted TDRs (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) SecurityLoan	Dec. 31, 2014 USD ($) SecurityLoan
Accounts, Notes, Loans and Financing Receivable
Threshold period for loans in default (in days)	30 days
TDRs Occurring during the Period | Non-Covered TDRs
Accounts, Notes, Loans and Financing Receivable
Number of loans | SecurityLoan	113
Pre-modification outstanding recorded investment	$ 62,631
Post-modification outstanding recorded investment	$ 57,041
Number of loans | SecurityLoan	62	40
Recorded investment	$ 35,793	$ 1,600
Commercial Loans | Real Estate | TDRs Occurring during the Period | Non-Covered TDRs
Accounts, Notes, Loans and Financing Receivable
Number of loans | SecurityLoan	11
Pre-modification outstanding recorded investment	$ 26,764
Post-modification outstanding recorded investment	$ 25,250
Number of loans | SecurityLoan	6	30
Recorded investment	$ 22,075	$ 0
Commercial Loans | Commercial and Industrial | TDRs Occurring during the Period | Non-Covered TDRs
Accounts, Notes, Loans and Financing Receivable
Number of loans | SecurityLoan	26
Pre-modification outstanding recorded investment	$ 21,233
Post-modification outstanding recorded investment	$ 18,114
Number of loans | SecurityLoan	20	9
Recorded investment	$ 8,970	$ 1,600
Commercial Loans | Energy-Related | TDRs Occurring during the Period | Non-Covered TDRs
Accounts, Notes, Loans and Financing Receivable
Number of loans | SecurityLoan	2
Pre-modification outstanding recorded investment	$ 9,797
Post-modification outstanding recorded investment	$ 9,484
Number of loans | SecurityLoan	1	0
Recorded investment	$ 3,120	$ 0
Residential Mortgage | Residential Mortgage | TDRs Occurring during the Period | Non-Covered TDRs
Accounts, Notes, Loans and Financing Receivable
Number of loans | SecurityLoan	1
Pre-modification outstanding recorded investment	$ 70
Post-modification outstanding recorded investment	$ 68
Number of loans | SecurityLoan	0	0
Recorded investment	$ 0	$ 0
Consumer and Other Loans | Consumer - Home Equity | TDRs Occurring during the Period | Non-Covered TDRs
Accounts, Notes, Loans and Financing Receivable
Number of loans | SecurityLoan	50
Pre-modification outstanding recorded investment	$ 4,440
Post-modification outstanding recorded investment	$ 3,865
Number of loans | SecurityLoan	20	0
Recorded investment	$ 1,547	$ 0
Consumer and Other Loans | Consumer - Indirect Automobile | TDRs Occurring during the Period | Non-Covered TDRs
Accounts, Notes, Loans and Financing Receivable
Number of loans | SecurityLoan	6
Pre-modification outstanding recorded investment	$ 79
Post-modification outstanding recorded investment	$ 79
Number of loans | SecurityLoan	6	0
Recorded investment	$ 79	$ 0
Consumer and Other Loans | Consumer - Other | TDRs Occurring during the Period | Non-Covered TDRs
Accounts, Notes, Loans and Financing Receivable
Number of loans | SecurityLoan	17
Pre-modification outstanding recorded investment	$ 248
Post-modification outstanding recorded investment	$ 181
Number of loans | SecurityLoan	9	1
Recorded investment	$ 2	$ 0

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Allowance for Credit Losses and Credit Quality - Schedule of Allowance for Loan Losses for Covered and Non-Covered Loan Portfolios (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for credit losses
Balance at beginning of the period	$ 130,131	$ 143,074	$ 251,603
Provision for (Reversal of) loan losses before adjustment attributable to FDIC loss share agreements	29,548	14,800	(50,940)
Adjustment attributable to FDIC loss share arrangements	(1,360)	(4,260)	(56,085)
Net provision for (reversal of) loan losses	30,908	19,060	5,145
Transfer of balance to OREO	(1,221)	(7,323)	(28,126)
Transfer of balance to the RULC			(9,828)
Loans charged off	(26,515)	(26,855)	(26,481)
Recoveries	6,435	6,435	6,846
Balance at end of the period	138,378	130,131	143,074
Reserve For Unfunded Commitments
Balance at beginning of the period	11,801	11,147	0
Transfer of balance from the allowance for loan losses			9,828
Provision for unfunded lending commitments	2,344	654	1,319
Balance at end of the period	14,145	11,801	11,147
Allowance for credit losses at end of period	152,523	141,932	154,221
Legacy Loans
Allowance for credit losses
Balance at beginning of the period	76,174	67,342	74,211
Provision for (Reversal of) loan losses before adjustment attributable to FDIC loss share agreements	27,711	14,274	6,828
Adjustment attributable to FDIC loss share arrangements	0	0	0
Net provision for (reversal of) loan losses	27,711	14,274	6,828
Transfer of balance to OREO	0	0	0
Transfer of balance to the RULC			(9,828)
Loans charged off	(15,778)	(11,312)	(10,686)
Recoveries	5,701	5,870	6,817
Balance at end of the period	93,808	76,174	67,342
Reserve For Unfunded Commitments
Balance at beginning of the period	11,801	11,147	0
Transfer of balance from the allowance for loan losses			9,828
Provision for unfunded lending commitments	2,344	654	1,319
Balance at end of the period	14,145	11,801	11,147
Allowance for credit losses at end of period	107,953	87,975	78,489
Acquired Loans
Allowance for credit losses
Balance at beginning of the period	53,957	75,732	177,392
Provision for (Reversal of) loan losses before adjustment attributable to FDIC loss share agreements	1,837	526	(57,768)
Adjustment attributable to FDIC loss share arrangements	(1,360)	(4,260)	(56,085)
Net provision for (reversal of) loan losses	3,197	4,786	(1,683)
Transfer of balance to OREO	(1,221)	(7,323)	(28,126)
Transfer of balance to the RULC			0
Loans charged off	(10,737)	(15,543)	(15,795)
Recoveries	734	565	29
Balance at end of the period	44,570	53,957	75,732
Reserve For Unfunded Commitments
Balance at beginning of the period	0	0	0
Transfer of balance from the allowance for loan losses			0
Provision for unfunded lending commitments	0	0	0
Balance at end of the period	0	0	0
Allowance for credit losses at end of period	$ 44,570	$ 53,957	$ 75,732

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Allowance for Credit Losses and Credit Quality - Schedule of Allowance for Loan Losses for Legacy and Acquired Loans, by Loan Portfolio (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses
Provision for Loan, Lease, and Other Losses	$ 30,908	$ 19,060	$ 5,145
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	130,131	143,074	251,603
Transfer of balance to the RULC			(9,828)
Transfer of balance to OREO	(1,221)	(7,323)	(28,126)
Loans charged off	(26,515)	(26,855)	(26,481)
Recoveries	6,435	6,435	6,846
Balance at end of the period	138,378	130,131	143,074
Financing Receivable, Reserve For Unfunded Commitments
Balance at beginning of the period	11,801	11,147	0
Transfer of balance from the allowance for loan losses			9,828
Balance at end of the period	14,145	11,801	11,147
Loans, net of unearned income:
Balance at end of period	229,217	444,544
Legacy Loans
Financing Receivable, Allowance for Credit Losses
Provision for Loan, Lease, and Other Losses	27,711	14,274	6,828
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	76,174	67,342	74,211
Transfer of balance to the RULC			(9,828)
Transfer of balance to OREO	0	0	0
Loans charged off	(15,778)	(11,312)	(10,686)
Recoveries	5,701	5,870	6,817
Balance at end of the period	93,808	76,174	67,342
Financing Receivable, Reserve For Unfunded Commitments
Balance at beginning of the period	11,801	11,147	0
Transfer of balance from the allowance for loan losses			9,828
Provision for (Reversal of) unfunded commitments	2,344	654	1,319
Balance at end of the period	14,145	11,801	11,147
Allowance on loans individually evaluated for impairment	3,993	430	1,029
Allowance on loans collectively evaluated for impairment	89,815	75,744	66,313
Loans, net of unearned income:
Balance at end of period	11,190,520	9,668,714	8,288,321
Balance at end of period individually evaluated for impairment	66,641	11,700	26,182
Balance at end of period collectively evaluated for impairment	11,123,879	9,657,014	8,262,139
Legacy Loans | Commercial Loans | Real Estate
Financing Receivable, Allowance for Credit Losses
Provision for Loan, Lease, and Other Losses	(1,466)	2,171	(5,919)
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	26,752	22,872	31,298
Transfer of balance to the RULC			(2,939)
Loans charged off	(2,525)	(1,164)	(2,908)
Recoveries	1,897	2,873	3,340
Balance at end of the period	24,658	26,752	22,872
Financing Receivable, Reserve For Unfunded Commitments
Balance at beginning of the period	3,370	3,071	0
Transfer of balance from the allowance for loan losses			2,939
Provision for (Reversal of) unfunded commitments	790	299	132
Balance at end of the period	4,160	3,370	3,071
Allowance on loans individually evaluated for impairment	1,246	20	8
Allowance on loans collectively evaluated for impairment	23,412	26,732	22,864
Loans, net of unearned income:
Balance at end of period	4,504,062	3,676,811	3,054,100
Balance at end of period individually evaluated for impairment	28,857	7,013	8,705
Balance at end of period collectively evaluated for impairment	4,475,205	3,669,798	3,045,395
Legacy Loans | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Provision for Loan, Lease, and Other Losses	(103)	4,971	3,870
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	24,455	20,839	20,605
Transfer of balance to the RULC			(3,497)
Loans charged off	(1,276)	(1,400)	(516)
Recoveries	207	45	377
Balance at end of the period	23,283	24,455	20,839
Financing Receivable, Reserve For Unfunded Commitments
Balance at beginning of the period	3,733	1,814	0
Transfer of balance from the allowance for loan losses			3,497
Provision for (Reversal of) unfunded commitments	(285)	1,919	(1,683)
Balance at end of the period	3,448	3,733	1,814
Allowance on loans individually evaluated for impairment	272	407	841
Allowance on loans collectively evaluated for impairment	23,011	24,048	19,998
Loans, net of unearned income:
Balance at end of period	2,952,102	2,452,521	2,234,173
Balance at end of period individually evaluated for impairment	20,086	3,988	15,812
Balance at end of period collectively evaluated for impairment	2,932,016	2,448,533	2,218,361
Legacy Loans | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Provision for Loan, Lease, and Other Losses	17,917	(929)	66
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	5,949	6,878	6,812
Transfer of balance to the RULC			0
Loans charged off	(3)	0	0
Recoveries	0	0	0
Balance at end of the period	23,863	5,949	6,878
Financing Receivable, Reserve For Unfunded Commitments
Balance at beginning of the period	1,596	3,043	0
Transfer of balance from the allowance for loan losses			0
Provision for (Reversal of) unfunded commitments	1,069	(1,447)	3,043
Balance at end of the period	2,665	1,596	3,043
Allowance on loans individually evaluated for impairment	2,122	0	0
Allowance on loans collectively evaluated for impairment	21,741	5,949	6,878
Loans, net of unearned income:
Balance at end of period	677,177	872,866	752,682
Balance at end of period individually evaluated for impairment	13,020	0	0
Balance at end of period collectively evaluated for impairment	664,157	872,866	752,682
Legacy Loans | Residential Mortgage
Financing Receivable, Allowance for Credit Losses
Provision for Loan, Lease, and Other Losses	1,493	566	758
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	2,678	2,546	1,583
Transfer of balance to the RULC			(40)
Loans charged off	(291)	(578)	(519)
Recoveries	67	144	764
Balance at end of the period	3,947	2,678	2,546
Financing Receivable, Reserve For Unfunded Commitments
Balance at beginning of the period	168	72	0
Transfer of balance from the allowance for loan losses			40
Provision for (Reversal of) unfunded commitments	662	96	32
Balance at end of the period	830	168	72
Allowance on loans individually evaluated for impairment	1	0	180
Allowance on loans collectively evaluated for impairment	3,946	2,678	2,366
Loans, net of unearned income:
Balance at end of period	694,023	527,694	414,372
Balance at end of period individually evaluated for impairment	70	0	1,407
Balance at end of period collectively evaluated for impairment	693,953	527,694	412,965
Legacy Loans | Consumer and Other Loans
Financing Receivable, Allowance for Credit Losses
Provision for Loan, Lease, and Other Losses	9,870	7,495	8,053
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	16,340	14,207	13,913
Transfer of balance to the RULC			(3,352)
Loans charged off	(11,683)	(8,170)	(6,743)
Recoveries	3,530	2,808	2,336
Balance at end of the period	18,057	16,340	14,207
Financing Receivable, Reserve For Unfunded Commitments
Balance at beginning of the period	2,934	3,147	0
Transfer of balance from the allowance for loan losses			3,352
Provision for (Reversal of) unfunded commitments	108	(213)	(205)
Balance at end of the period	3,042	2,934	3,147
Allowance on loans individually evaluated for impairment	352	3	0
Allowance on loans collectively evaluated for impairment	17,705	16,337	14,207
Loans, net of unearned income:
Balance at end of period	2,363,156	2,138,822	1,832,994
Balance at end of period individually evaluated for impairment	4,608	699	258
Balance at end of period collectively evaluated for impairment	2,358,548	2,138,123	1,832,736
Acquired Loans
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	53,957	75,732	177,392
Transfer of balance to the RULC			0
Provision for (Reversal of) loan losses	3,197	4,786	(1,683)
Increase (Decrease) in FDIC loss share receivable	(1,360)	(4,260)	(56,085)
Transfer of balance to OREO	(1,221)	(7,323)	(28,126)
Loans charged off	(10,737)	(15,543)	(15,795)
Recoveries	734	565	29
Balance at end of the period	44,570	53,957	75,732
Financing Receivable, Reserve For Unfunded Commitments
Balance at beginning of the period	0	0	0
Transfer of balance from the allowance for loan losses			0
Balance at end of the period	0	0	0
Allowance on loans individually evaluated for impairment	86	0	0
Allowance on loans collectively evaluated for impairment	44,484	53,957	75,732
Loans, net of unearned income:
Balance at end of period	3,136,908	1,772,330	1,203,698
Balance at end of period individually evaluated for impairment	1,342	0	0
Balance at end of period collectively evaluated for impairment	2,410,856	905,179	750,909
Balance at end of period acquired with deteriorated credit quality	724,710	867,151	452,789
Acquired Loans | Commercial Loans | Real Estate
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	29,949	42,026	107,269
Provision for (Reversal of) loan losses	2,182	665	(1,286)
Increase (Decrease) in FDIC loss share receivable	757	227	(28,238)
Transfer of balance to OREO	174	(1,897)	(19,953)
Loans charged off	(7,810)	(11,201)	(15,795)
Recoveries	727	129	29
Balance at end of the period	25,979	29,949	42,026
Financing Receivable, Reserve For Unfunded Commitments
Allowance on loans individually evaluated for impairment	0	0	0
Allowance on loans collectively evaluated for impairment	25,979	29,949	42,026
Loans, net of unearned income:
Balance at end of period	1,569,449	684,968	732,401
Balance at end of period individually evaluated for impairment	720	0	0
Balance at end of period collectively evaluated for impairment	1,149,315	169,338	393,487
Balance at end of period acquired with deteriorated credit quality	419,414	515,630	338,914
Acquired Loans | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	3,265	6,641	13,246
Provision for (Reversal of) loan losses	(122)	536	(1,146)
Increase (Decrease) in FDIC loss share receivable	(49)	509	(5,032)
Transfer of balance to OREO	(170)	(2,030)	(427)
Loans charged off	(105)	(2,451)	0
Recoveries	0	60	0
Balance at end of the period	2,819	3,265	6,641
Financing Receivable, Reserve For Unfunded Commitments
Allowance on loans individually evaluated for impairment	41	0	0
Allowance on loans collectively evaluated for impairment	2,778	3,265	6,641
Loans, net of unearned income:
Balance at end of period	492,476	119,174	90,062
Balance at end of period individually evaluated for impairment	164	0	0
Balance at end of period collectively evaluated for impairment	450,652	60,584	37,430
Balance at end of period acquired with deteriorated credit quality	41,660	58,590	52,632
Acquired Loans | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	51	0
Provision for (Reversal of) loan losses	74	51
Increase (Decrease) in FDIC loss share receivable	0	0
Transfer of balance to OREO	0	0
Loans charged off	0	0
Recoveries	0	0
Balance at end of the period	125	51	0
Financing Receivable, Reserve For Unfunded Commitments
Allowance on loans individually evaluated for impairment	0	0
Allowance on loans collectively evaluated for impairment	125	51
Loans, net of unearned income:
Balance at end of period	3,589	7,742
Balance at end of period individually evaluated for impairment	0	0
Balance at end of period collectively evaluated for impairment	3,589	7,742
Balance at end of period acquired with deteriorated credit quality	0	0
Acquired Loans | Residential Mortgage
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	6,484	10,889	23,108
Provision for (Reversal of) loan losses	2,126	1,296	390
Increase (Decrease) in FDIC loss share receivable	(235)	(3,854)	(4,896)
Transfer of balance to OREO	(541)	(1,719)	(7,713)
Loans charged off	0	(232)	0
Recoveries	7	104	0
Balance at end of the period	7,841	6,484	10,889
Financing Receivable, Reserve For Unfunded Commitments
Allowance on loans individually evaluated for impairment	0	0	0
Allowance on loans collectively evaluated for impairment	7,841	6,484	10,889
Loans, net of unearned income:
Balance at end of period	501,296	552,603	172,160
Balance at end of period individually evaluated for impairment	0	0	0
Balance at end of period collectively evaluated for impairment	360,252	402,347	162,248
Balance at end of period acquired with deteriorated credit quality	141,044	150,256	9,912
Acquired Loans | Consumer and Other Loans
Financing Receivable, Allowance for Credit Losses
Balance at beginning of the period	14,208	16,176	33,769
Provision for (Reversal of) loan losses	(1,063)	2,238	359
Increase (Decrease) in FDIC loss share receivable	(1,833)	(1,142)	(17,919)
Transfer of balance to OREO	(684)	(1,677)	(33)
Loans charged off	(2,822)	(1,659)	0
Recoveries	0	272	0
Balance at end of the period	7,806	14,208	16,176
Financing Receivable, Reserve For Unfunded Commitments
Allowance on loans individually evaluated for impairment	45	0	0
Allowance on loans collectively evaluated for impairment	7,761	14,208	16,176
Loans, net of unearned income:
Balance at end of period	570,098	407,843	209,075
Balance at end of period individually evaluated for impairment	458	0	0
Balance at end of period collectively evaluated for impairment	447,048	265,168	157,744
Balance at end of period acquired with deteriorated credit quality	$ 122,592	$ 142,675	$ 51,331

XML

Allowance for Credit Losses and Credit Quality - Investment in Legacy and Acquired Loans by Credit Quality Indicator (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses
Non-covered loans, net of unearned income	$ 14,098,211	$ 10,996,500
Legacy Loans
Financing Receivable, Allowance for Credit Losses
Current	11,118,859	9,603,423
Non-covered loans, net of unearned income	11,190,520	9,668,714
Legacy Loans | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	8,133,341	7,002,198
Non-covered loans, net of unearned income	8,133,341	7,002,198
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	636,481	484,239
Current	635,560	483,663
Non-covered loans, net of unearned income	636,481	484,239
Legacy Loans | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	3,867,581	3,192,572
Current	3,848,584	3,173,766
Non-covered loans, net of unearned income	3,867,581	3,192,572
Legacy Loans | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	2,952,102	2,452,521
Current	2,943,409	2,445,847
Non-covered loans, net of unearned income	2,952,102	2,452,521
Legacy Loans | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	677,177	872,866
Current	670,081	872,839
Non-covered loans, net of unearned income	677,177	872,866
Legacy Loans | Residential and Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Current	3,021,225	2,627,308
30 or more days past due	35,954	39,208
Non covered commercial loans, net	3,057,179	2,666,516
Legacy Loans | Residential Mortgage
Financing Receivable, Allowance for Credit Losses
Non-covered loans, net of unearned income	694,023	527,694
Legacy Loans | Residential Mortgage | Residential Mortgage
Financing Receivable, Allowance for Credit Losses
Current	676,347	508,789
30 or more days past due	17,676	18,905
Non covered commercial loans, net	694,023	527,694
Current	676,347	508,789
Non-covered loans, net of unearned income	694,023	527,694
Legacy Loans | Consumer and Other Loans
Financing Receivable, Allowance for Credit Losses
Non-covered loans, net of unearned income	2,363,156	2,138,822
Legacy Loans | Consumer and Other Loans | Consumer - Home Equity
Financing Receivable, Allowance for Credit Losses
Current	1,565,596	1,278,865
30 or more days past due	10,047	12,111
Non covered commercial loans, net	1,575,643	1,290,976
Current	1,565,596	1,278,865
Non-covered loans, net of unearned income	1,575,643	1,290,976
Legacy Loans | Consumer and Other Loans | Consumer - Indirect Automobile
Financing Receivable, Allowance for Credit Losses
Current	242,328	392,504
30 or more days past due	3,886	4,262
Non covered commercial loans, net	246,214	396,766
Current	242,328	392,504
Non-covered loans, net of unearned income	246,214	396,766
Legacy Loans | Consumer and Other Loans | Consumer - Credit Card
Financing Receivable, Allowance for Credit Losses
Current	76,360	71,297
30 or more days past due	901	1,448
Non covered commercial loans, net	77,261	72,745
Current	76,360	71,297
Non-covered loans, net of unearned income	77,261	72,745
Legacy Loans | Consumer and Other Loans | Consumer - Other
Financing Receivable, Allowance for Credit Losses
Non-covered loans, net of unearned income	541,299	451,080
Legacy Loans | Consumer and Other Loans | Consumer - Other
Financing Receivable, Allowance for Credit Losses
Current	460,594	375,853
30 or more days past due	3,444	2,482
Non covered commercial loans, net	464,038	378,335
Current	460,594	375,853
Non-covered loans, net of unearned income	464,038	378,335
Legacy Loans | Pass | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	7,884,470	6,891,435
Legacy Loans | Pass | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	634,889	483,930
Legacy Loans | Pass | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	3,806,528	3,120,370
Legacy Loans | Pass | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	2,911,396	2,414,293
Legacy Loans | Pass | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	531,657	872,842
Legacy Loans | Special Mention | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	104,800	57,417
Legacy Loans | Special Mention | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	160	240
Legacy Loans | Special Mention | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	21,877	49,847
Legacy Loans | Special Mention | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	14,826	7,330
Legacy Loans | Special Mention | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	67,937	0
Legacy Loans | Substandard | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	132,593	51,251
Legacy Loans | Substandard | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	1,432	69
Legacy Loans | Substandard | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	37,001	22,193
Legacy Loans | Substandard | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	19,888	28,965
Legacy Loans | Substandard | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	74,272	24
Legacy Loans | Doubtful | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	11,478	2,095
Legacy Loans | Doubtful | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	0	0
Legacy Loans | Doubtful | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	2,175	162
Legacy Loans | Doubtful | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	5,992	1,933
Legacy Loans | Doubtful | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	3,311	0
Acquired Loans
Financing Receivable, Allowance for Credit Losses
Current	3,137,451	1,751,170
Non-covered loans, net of unearned income	3,136,908	1,772,330
Acquired Loans | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Premium (discount)	(60,088)	(62,026)
Non-covered loans, net of unearned income	2,065,514	811,884
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Current	120,467	64,393
Premium (discount)	(2,368)	(4,482)
Non-covered loans, net of unearned income	125,426	70,933
Acquired Loans | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Current	1,434,966	588,947
Premium (discount)	(50,820)	(50,530)
Non-covered loans, net of unearned income	1,444,023	614,035
Acquired Loans | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Current	490,255	119,472
Premium (discount)	(6,900)	(7,014)
Non-covered loans, net of unearned income	492,476	119,174
Acquired Loans | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Current	2,221	7,731
Premium (discount)	0	0
Non-covered loans, net of unearned income	3,589	7,742
Acquired Loans | Residential and Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Current	1,089,542	970,627
30 or more days past due	42,620	63,877
Premium (discount)	(60,768)	(74,058)
Non-covered loans, net of unearned income	1,071,394	960,446
Acquired Loans | Residential Mortgage
Financing Receivable, Allowance for Credit Losses
Non-covered loans, net of unearned income	501,296	552,603
Acquired Loans | Residential Mortgage | Residential Mortgage
Financing Receivable, Allowance for Credit Losses
Current	506,103	559,180
30 or more days past due	24,752	33,916
Premium (discount)	(29,559)	(40,493)
Non-covered loans, net of unearned income	501,296	552,603
Acquired Loans | Consumer and Other Loans
Financing Receivable, Allowance for Credit Losses
Non-covered loans, net of unearned income	570,098	407,843
Acquired Loans | Consumer and Other Loans | Consumer - Home Equity
Financing Receivable, Allowance for Credit Losses
Current	503,635	315,788
30 or more days past due	16,381	26,350
Premium (discount)	(29,492)	(32,009)
Non-covered loans, net of unearned income	490,524	310,129
Acquired Loans | Consumer and Other Loans | Consumer - Indirect Automobile
Financing Receivable, Allowance for Credit Losses
Current	72	393
30 or more days past due	12	39
Premium (discount)	0	(40)
Non-covered loans, net of unearned income	84	392
Acquired Loans | Consumer and Other Loans | Consumer - Credit Card
Financing Receivable, Allowance for Credit Losses
Current	565	614
Non-covered loans, net of unearned income	582	648
Acquired Loans | Consumer and Other Loans | Consumer - Other
Financing Receivable, Allowance for Credit Losses
Current	79,732	95,266
30 or more days past due	1,475	3,572
Premium (discount)	(1,717)	(1,516)
Non-covered loans, net of unearned income	79,490	97,322
Acquired Loans | Consumer and Other Loans | Consumer - Other
Financing Receivable, Allowance for Credit Losses
Current	79,167	94,652
Non-covered loans, net of unearned income	78,908	96,674
Acquired Loans | Pass | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	1,975,355	707,131
Acquired Loans | Pass | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	116,539	58,849
Acquired Loans | Pass | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	1,383,409	530,958
Acquired Loans | Pass | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	473,241	109,593
Acquired Loans | Pass | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	2,166	7,731
Acquired Loans | Special Mention | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	36,192	39,406
Acquired Loans | Special Mention | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	1,681	3,934
Acquired Loans | Special Mention | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	26,080	33,216
Acquired Loans | Special Mention | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	8,376	2,256
Acquired Loans | Special Mention | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	55	0
Acquired Loans | Substandard | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	104,602	127,116
Acquired Loans | Substandard | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	8,803	12,632
Acquired Loans | Substandard | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	79,119	100,391
Acquired Loans | Substandard | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	16,510	14,082
Acquired Loans | Substandard | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	170	11
Acquired Loans | Doubtful | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	9,299	257
Acquired Loans | Doubtful | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	771	0
Acquired Loans | Doubtful | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	6,124	0
Acquired Loans | Doubtful | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	1,206	257
Acquired Loans | Doubtful | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	1,198	$ 0
Acquired Loans | Loss | Commercial Loans
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	154
Acquired Loans | Loss | Commercial Loans | Commercial Real Estate - Construction
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	0
Acquired Loans | Loss | Commercial Loans | Commercial Real Estate - Other
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	111
Acquired Loans | Loss | Commercial Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	43
Acquired Loans | Loss | Commercial Loans | Energy-Related
Financing Receivable, Allowance for Credit Losses
Credit quality indicator by asset risk classification	$ 0

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Allowance for Credit Losses and Credit Quality - Schedule of Investment in Legacy Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired
Recorded investment	$ 85,393	$ 36,560	$ 45,342
Unpaid principal balance	89,516	37,327	46,501
Related allowance	(4,123)	(767)	(1,159)
Average recorded investment	96,221	39,176	49,645
Interest income recognized	3,145	513	587
Commercial Loans
Financing Receivable, Impaired
Recorded investment	60,289	11,443	25,018
Unpaid principal balance	63,944	11,876	25,877
Related allowance	(3,655)	(433)	(859)
Average recorded investment	70,449	12,851	28,823
Interest income recognized	2,819	251	321
Residential Mortgage
Financing Receivable, Impaired
Recorded investment	13,679	14,111	11,408
Unpaid principal balance	13,743	14,363	11,645
Related allowance	(64)	(252)	(237)
Average recorded investment	14,086	14,263	9,675
Interest income recognized	87	110	98
Consumer and Other Loans
Financing Receivable, Impaired
Recorded investment	11,425	11,006	8,916
Unpaid principal balance	11,829	11,088	8,979
Related allowance	(404)	(82)	(63)
Average recorded investment	11,686	12,062	11,147
Interest income recognized	244	152	168
With No Related Allowance Recorded | Commercial Loans | Real Estate
Financing Receivable, Impaired
Recorded investment	16,145	6,680	8,567
Unpaid principal balance	16,145	6,680	8,567
Related allowance	0	0	0
Average recorded investment	15,864	6,703	10,443
Interest income recognized	315	132	43
With No Related Allowance Recorded | Commercial Loans | Commercial and Industrial
Financing Receivable, Impaired
Recorded investment	14,340	2,483	13,256
Unpaid principal balance	14,340	2,483	13,256
Related allowance	0	0	0
Average recorded investment	18,839	2,873	11,074
Interest income recognized	1,148	57	170
With No Related Allowance Recorded | Commercial Loans | Energy-Related
Financing Receivable, Impaired
Recorded investment	0
Unpaid principal balance	0
Related allowance	0
Average recorded investment	0
Interest income recognized	0
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home Equity
Financing Receivable, Impaired
Recorded investment	730	682	258
Unpaid principal balance	730	682	258
Related allowance	0	0	0
Average recorded investment	533	696	281
Interest income recognized	22	19	1
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Other
Financing Receivable, Impaired
Recorded investment	66
Unpaid principal balance	66
Related allowance	0
Average recorded investment	66
Interest income recognized	5
With An Allowance Recorded | Commercial Loans | Real Estate
Financing Receivable, Impaired
Recorded investment	12,500	1,044	1,268
Unpaid principal balance	13,753	1,069	1,284
Related allowance	(1,253)	(25)	(16)
Average recorded investment	14,055	1,134	4,414
Interest income recognized	554	38	8
With An Allowance Recorded | Commercial Loans | Commercial and Industrial
Financing Receivable, Impaired
Recorded investment	5,985	1,209	1,927
Unpaid principal balance	6,262	1,617	2,770
Related allowance	(277)	(408)	(843)
Average recorded investment	7,352	2,113	2,892
Interest income recognized	331	23	100
With An Allowance Recorded | Commercial Loans | Energy-Related
Financing Receivable, Impaired
Recorded investment	11,319	27
Unpaid principal balance	13,444	27
Related allowance	(2,125)	0
Average recorded investment	14,339	28
Interest income recognized	471	1
With An Allowance Recorded | Residential Mortgage | Residential Mortgage
Financing Receivable, Impaired
Recorded investment	13,679	14,111	11,408
Unpaid principal balance	13,743	14,363	11,645
Related allowance	(64)	(252)	(237)
Average recorded investment	14,086	14,263	9,675
Interest income recognized	82	110	98
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home Equity
Financing Receivable, Impaired
Recorded investment	8,196	7,121	6,506
Unpaid principal balance	8,559	7,165	6,550
Related allowance	(363)	(44)	(44)
Average recorded investment	7,554	7,544	7,593
Interest income recognized	129	43	93
With An Allowance Recorded | Consumer and Other Loans | Consumer - Indirect Automobile
Financing Receivable, Impaired
Recorded investment	1,171	1,410	1,267
Unpaid principal balance	1,181	1,419	1,275
Related allowance	(10)	(9)	(8)
Average recorded investment	1,613	2,016	2,090
Interest income recognized	44	51	55
With An Allowance Recorded | Consumer and Other Loans | Consumer - Credit Card
Financing Receivable, Impaired
Recorded investment	386	1,012	404
Unpaid principal balance	394	1,032	411
Related allowance	(8)	(20)	(7)
Average recorded investment	881	797	418
Interest income recognized	0	0	0
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other
Financing Receivable, Impaired
Recorded investment	876	781	481
Unpaid principal balance	899	790	485
Related allowance	(23)	(9)	(4)
Average recorded investment	1,039	1,009	765
Interest income recognized	$ 44	$ 39	$ 19

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Loss Sharing Agreements and FDIC Loss Share Receivable (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2013 USD ($)	Dec. 31, 2021 acquisition	Dec. 31, 2020 acquisition	Dec. 31, 2019 acquisition	Dec. 31, 2016 acquisition	Dec. 31, 2015 USD ($) acquisition Business	Dec. 31, 2014 USD ($) acquisition	Dec. 31, 2013 USD ($)
Loss Sharing Agreements and FDIC Loss Share Receivable [Abstract]
Number of acquisitions | Business						6
Percentage of covered loan and foreclosed real estate losses						80.00%
Percentage of losses, that exceed contractual thresholds, that are covered						95.00%
Number of acquisitions exceeding loan loss contractual threshold						3
Loss Sharing Agreements and FDIC Loss Share Receivable
Recovery period for covered assets (in years)						3 years
FDIC loss share receivables | $						$ 39,878	$ 69,627	$ 162,312
Impairment | $	$ 31,800					$ 0	$ 5,121
Excluding Single Family
Loss Sharing Agreements and FDIC Loss Share Receivable
Number of acquisitions where FDIC loan loss reimbursable period Is ending						1	3
Excluding Single Family | Forecast
Loss Sharing Agreements and FDIC Loss Share Receivable
Number of acquisitions where FDIC loan loss reimbursable period Is ending					2
Single Family | Forecast
Loss Sharing Agreements and FDIC Loss Share Receivable
Number of acquisitions where FDIC loan loss reimbursable period Is ending		2	1	3

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Loss Sharing Agreements and FDIC Loss Share Receivable - Schedule of FDIC Loss Share Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
FDIC Indemnification Asset
Balance at beginning of period		$ 69,627	$ 162,312
Adjustment attributable to FDIC loss share arrangements		(1,360)	(4,260)	$ (56,085)
Amortization		(23,500)	(74,617)	(97,849)
(Submission of reimbursable losses) recoveries payable to the FDIC		(2,444)	3,282
Impairment of FDIC loss share receivables and other long-lived assets	$ (31,800)	0	(5,121)
Changes due to a change in cash flow assumptions on OREO and other changes		(2,445)	(11,969)
Balance at end of period		$ 39,878	$ 69,627	$ 162,312

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Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Transfers and Servicing [Abstract]
Unpaid principal balances of loans serviced	$ 888.4	$ 533.8

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Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity) - Changes in Carrying Amount of Mortgage Loans Held-for-sale (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Transfers and Servicing [Abstract]
Balance at beginning of period	$ 140,072	$ 128,442	$ 267,475
Originations and purchases	2,464,588	1,675,538	2,116,460
Sales, net of gains	(2,432,979)	(1,657,409)	(2,255,493)
Other	(5,434)	(6,499)	0
Balance at end of period	$ 166,247	$ 140,072	$ 128,442

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Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity) - Components of Mortgage Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Participating Mortgage Loans
Gains on sales	$ 83,131	$ 59,156	$ 65,393
Total mortgage income	81,122	51,797	64,197
Mortgage Income
Participating Mortgage Loans
Mortgage loans held for sale and derivatives	2,216	631	(4,822)
Derivative settlements, net	(5,017)	(8,743)	3,100
Gains on sales	83,131	59,156	65,393
Servicing and other income, net	792	753	526
Total mortgage income	$ 81,122	$ 51,797	$ 64,197

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Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity) - Schedule of Mortgage Servicing Rights at Carrying Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	$ 75,654	$ 57,665
Accumulated Amortization	(45,134)	(37,304)
Net Carrying Amount	30,520	20,361
Mortgage Servicing Rights
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	6,104	4,751
Accumulated Amortization	(2,320)	(1,253)
Net Carrying Amount	$ 3,784	$ 3,498

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Premises and Equipment - Schedule of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Land	$ 84,438	$ 75,916
Buildings	245,934	232,727
Furniture, fixtures and equipment	140,031	128,388
Total premises and equipment	470,403	437,031
Accumulated depreciation	(146,501)	(129,872)
Total premises and equipment, net	$ 323,902	$ 307,159

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Premises and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment
Depreciation expense	$ 22.2	$ 19.4	$ 19.6
Maximum lease term	6 years
Average lease income (in usd per month)	$ 0.2
Total lease income	2.4	1.6	1.5
Rent expense	$ 15.4	10.9	$ 11.4
Minimum
Property, Plant and Equipment
Operating lease term (in years)	1 year
Maximum
Property, Plant and Equipment
Operating lease term (in years)	50 years
Buildings
Property, Plant and Equipment
Total allocated cost of portion of buildings held for lease	$ 8.2	7.6
Accumulated depreciation	$ 2.6	$ 2.4

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Premises and Equipment - Schedule of Minimum Future Annual Rent Commitments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Property, Plant and Equipment [Abstract]
2016	$ 16,957
2017	14,751
2018	13,491
2019	11,952
2020	10,735
2021 and thereafter	41,054
Total	$ 108,940

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Goodwill and Other Acquired Intangible Assets - Schedule of Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill
Balance at beginning of the period	$ 517,526
Balance at end of the period	724,603	$ 517,526
Operating Segments
Goodwill
Balance at beginning of the period	517,526	401,872
Goodwill acquired during the year	207,077	115,654
Balance at end of the period	724,603	517,526
Operating Segments | IBERIABANK
Goodwill
Balance at beginning of the period	489,183	373,905
Goodwill acquired during the year	207,077	115,278
Balance at end of the period	696,260	489,183
Operating Segments | IMC
Goodwill
Balance at beginning of the period	23,178	23,178
Goodwill acquired during the year	0	0
Balance at end of the period	23,178	23,178
Operating Segments | LTC
Goodwill
Balance at beginning of the period	5,165	4,789
Goodwill acquired during the year	0	376
Balance at end of the period	$ 5,165	$ 5,165

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Goodwill and Other Acquired Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Title plant assets	$ 6.7	$ 6.7

XML

Goodwill and Other Acquired Intangible Assets - Schedule of Definite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	$ 75,654	$ 57,665
Accumulated Amortization	(45,134)	(37,304)
Net Carrying Amount	30,520	20,361
Core Deposit Intangibles
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	74,001	55,949
Accumulated Amortization	(43,957)	(36,354)
Net Carrying Amount	30,044	19,595
Customer Relationship Intangible Asset
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	1,348	1,348
Accumulated Amortization	(984)	(822)
Net Carrying Amount	364	526
Non-compete Agreements
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	100	163
Accumulated Amortization	(79)	(82)
Net Carrying Amount	21	81
Other Intangible Assets
Acquired Finite-Lived Intangible Assets
Gross Carrying Amount	205	205
Accumulated Amortization	(114)	(46)
Net Carrying Amount	$ 91	$ 159

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Goodwill and Other Acquired Intangible Assets - Schedule of Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Aggregate amortization expense	$ 7,811	$ 5,807	$ 4,720
Estimated amortization expense for the years ended December 31:
2016	8,338
2017	6,775
2018	5,786
2019	5,066
2020	3,613
2021 and thereafter	$ 942

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Derivative Instruments and Other Hedging Activities - Schedule of Outstanding Derivative Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value of Derivatives
Derivative Asset	$ 30,486	$ 32,903
Derivative Liability	24,939	31,354
Notional Amount of Derivatives
Derivative assets	1,255,277	823,180
Derivative liabilities	950,105	1,062,436
Designated as Hedging Instruments
Fair Value of Derivatives
Derivative Asset	58	0
Derivative Liability	0	0
Notional Amount of Derivatives
Derivative assets	108,500	0
Derivative liabilities	0	0
Designated as Hedging Instruments | Interest Rate Contracts
Notional Amount of Derivatives
Derivative assets	108,500	0
Derivative liabilities	0	0
Designated as Hedging Instruments | Interest Rate Contracts | Other Assets
Fair Value of Derivatives
Derivative Asset	58	0
Designated as Hedging Instruments | Interest Rate Contracts | Other Liabilities
Fair Value of Derivatives
Derivative Liability	0	0
Not Designated as Hedging Instruments
Fair Value of Derivatives
Derivative Asset	30,428	32,903
Derivative Liability	24,939	31,354
Notional Amount of Derivatives
Derivative assets	1,146,777	823,180
Derivative liabilities	950,105	1,062,436
Not Designated as Hedging Instruments | Interest Rate Contracts
Notional Amount of Derivatives
Derivative assets	590,334	444,703
Derivative liabilities	590,334	444,703
Not Designated as Hedging Instruments | Interest Rate Contracts | Other Assets
Fair Value of Derivatives
Derivative Asset	18,077	15,434
Not Designated as Hedging Instruments | Interest Rate Contracts | Other Liabilities
Fair Value of Derivatives
Derivative Liability	18,077	15,434
Not Designated as Hedging Instruments | Foreign Exchange Contracts
Notional Amount of Derivatives
Derivative assets	4,392	0
Derivative liabilities	4,392	0
Not Designated as Hedging Instruments | Foreign Exchange Contracts | Other Assets
Fair Value of Derivatives
Derivative Asset	156	0
Not Designated as Hedging Instruments | Foreign Exchange Contracts | Other Liabilities
Fair Value of Derivatives
Derivative Liability	134	0
Not Designated as Hedging Instruments | Forward Sales Contracts
Notional Amount of Derivatives
Derivative assets	223,841	15,897
Derivative liabilities	173,430	391,992
Not Designated as Hedging Instruments | Forward Sales Contracts | Other Assets
Fair Value of Derivatives
Derivative Asset	1,588	25
Not Designated as Hedging Instruments | Forward Sales Contracts | Other Liabilities
Fair Value of Derivatives
Derivative Liability	474	2,556
Not Designated as Hedging Instruments | Written and Purchased Options
Notional Amount of Derivatives
Derivative assets	328,210	362,580
Derivative liabilities	181,949	225,741
Not Designated as Hedging Instruments | Written and Purchased Options | Other Assets
Fair Value of Derivatives
Derivative Asset	10,607	17,444
Not Designated as Hedging Instruments | Written and Purchased Options | Other Liabilities
Fair Value of Derivatives
Derivative Liability	$ 6,254	$ 13,364

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Derivative Instruments and Other Hedging Activities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash as collateral for derivative transactions	$ 21.8	$ 11.5

XML

Derivative Instruments and Other Hedging Activities - Reconciliation of Gross Amounts in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative assets
Derivative instruments	$ 24,393	$ 28,798
Gross amounts not offset in the Balance Sheet, derivatives	0	0
Gross amounts not offset in the Balance Sheet, collateral	(45)	0
Net	24,348	28,798
Derivative liabilities
Gross amounts not offset in the Balance Sheet, derivatives	0	0
Gross amounts not offset in the Balance Sheet, collateral	(9,428)	(3,735)
Net	8,630	11,676
Derivative instruments	18,058	15,411
Written and Purchased Options
Derivative assets
Derivative instruments	6,277	13,387
Gross amounts not offset in the Balance Sheet, derivatives	0	0
Gross amounts not offset in the Balance Sheet, collateral	0	0
Net	6,277	13,387
Designated as Hedging Instruments | Interest Rate Contracts
Derivative assets
Derivative instruments	58	0
Gross amounts not offset in the Balance Sheet, derivatives	0	0
Gross amounts not offset in the Balance Sheet, collateral	(45)	0
Net	13	0
Not Designated as Hedging Instruments | Interest Rate Contracts
Derivative assets
Derivative instruments	18,058	15,411
Gross amounts not offset in the Balance Sheet, derivatives	0	0
Gross amounts not offset in the Balance Sheet, collateral	0	0
Net	18,058	15,411
Derivative liabilities
Gross amounts not offset in the Balance Sheet, derivatives	0	0
Gross amounts not offset in the Balance Sheet, collateral	(9,428)	(3,735)
Net	8,630	11,676
Derivative instruments	$ 18,058	$ 15,411

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Derivative Instruments and Other Hedging Activities - Effect of Hedging Instruments on Consolidated Financial Statements (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Designated as Hedging Instruments | Cash Flow Hedging | Interest Rate Contracts | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures
Amount of gain (loss) recognized in OCI, net of taxes	$ 38	$ 0	$ 619
Amount of gain (loss) reclassified from Accumulated OCI into income	0	0	(391)
Amount of gain (loss) recognized in income on derivative	0	(1)	1
Not Designated as Hedging Instruments
Derivative Instruments and Hedging Activities Disclosures
Gain (loss) on derivatives, net	1,492	(6,451)	(1,757)
Not Designated as Hedging Instruments | Interest Rate Contracts | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures
Gain (loss) on derivatives, net	4,143	2,513	2,991
Not Designated as Hedging Instruments | Foreign Exchange Contracts | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures
Gain (loss) on derivatives, net	22	0	0
Not Designated as Hedging Instruments | Forward Sales Contracts | Mortgage Income
Derivative Instruments and Hedging Activities Disclosures
Gain (loss) on derivatives, net	(2,947)	(3,225)	(1,716)
Not Designated as Hedging Instruments | Written and Purchased Options | Mortgage Income
Derivative Instruments and Hedging Activities Disclosures
Gain (loss) on derivatives, net	$ 274	$ (5,739)	$ (3,032)

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Derivative Instruments and Other Hedging Activities - Outstanding Interest Rate Swap Agreements Not Designated as Hedging Instruments (Detail) - Not Designated as Hedging Instruments - Interest Rate Swap [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative
Weighted average pay rate	3.20%	2.90%	3.00%
Weighted average receive rate	0.90%	0.40%	0.20%
Weighted average maturity in years	7 years 6 months	7 years 8 months 12 days	7 years 7 months 6 days
Unrealized gain (loss) relating to interest rate swaps	$ 0	$ 0	$ 0

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Deposits - Schedule of Deposits by Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
Non-interest-bearing deposits	$ 4,352,229	$ 3,195,430
Negotiable order of withdrawal (NOW)	2,974,176	2,462,841
Money market deposits accounts (MMDA)	6,010,882	4,168,504
Savings deposits	716,838	577,513
Certificates of deposit and other time deposits	2,124,623	2,116,237
Total deposits	$ 16,178,748	$ 12,520,525	$ 10,737,000

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Deposits - Schedule of Time Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Time Deposits, Less than $250,000	$ 1,456,804	$ 1,767,448
Time Deposits, $250,000 or More	667,819	348,789
Total time deposits	$ 2,124,623	$ 2,116,237

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Deposits - Schedule of Maturities of Certificates of Deposit (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
2016	$ 1,380,655
2017	423,866
2018	112,915
2019	64,170
2020	81,418
2021 and thereafter	61,599
Total time deposits	$ 2,124,623	$ 2,116,237

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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 110,000,000	$ 603,000,000
Securities sold under agreements to repurchase	216,617,000	242,742,000
Total short-term borrowings	326,617,000	845,742,000	$ 680,344,000
Short-term Debt, Other Disclosures
Maximum month-end outstanding balance	798,933,000	1,034,741,000	680,344,000
Average daily outstanding balance	$ 426,011,000	$ 782,033,000	$ 303,352,000
Average rate during the year	0.18%	0.17%	0.16%
Average rate at year end	0.20%	0.18%	0.15%
Maximum borrowing capacity	$ 180,000,000.0
Amount outstanding at end of period	$ 0

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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument
Long-term debt	$ 340,447	$ 403,254
IBERIABANK
Debt Instrument
Long-term debt	220,337	291,392
IBERIABANK | Federal Home Loan Bank Notes
Debt Instrument
Long-term debt	$ 136,628	$ 210,549
Minimum interest rate	0.903%	0.903%
Maximum interest rate	7.04%	7.04%
IBERIABANK | Notes Payable
Debt Instrument
Long-term debt	$ 83,709	$ 80,843
Minimum interest rate	0.50%	0.50%
Maximum interest rate	5.00%	5.00%
IBERIABANK | Notes Payable | Minimum
Debt Instrument
Debt Instrument term (in years)	7 years	7 years
IBERIABANK | Notes Payable | Maximum
Debt Instrument
Debt Instrument term (in years)	40 years	40 years
IBERIABANK Corporation | Junior Subordinated Debt
Debt Instrument
Long-term debt	$ 120,110	$ 111,862
Debt Instrument term (in years)	30 years
IBERIABANK Corporation | Junior Subordinated Debt | Statutory Trust I, 3 month LIBOR, plus 3.25%
Debt Instrument
Long-term debt	$ 10,310	10,310
IBERIABANK Corporation | Junior Subordinated Debt | Statutory Trust II, 3 month LIBOR, plus 3.15%
Debt Instrument
Long-term debt	10,310	10,310
IBERIABANK Corporation | Junior Subordinated Debt | Statutory Trust III, 3 month LIBOR, plus 2.00%
Debt Instrument
Long-term debt	10,310	10,310
IBERIABANK Corporation | Junior Subordinated Debt | Statutory Trust IV, 3 month LIBOR, plus 1.60%
Debt Instrument
Long-term debt	15,464	15,464
IBERIABANK Corporation | Junior Subordinated Debt | American Horizons Statutory Trust I, 3 month LIBOR, plus 3.15%
Debt Instrument
Long-term debt	6,186	6,186
IBERIABANK Corporation | Junior Subordinated Debt | Statutory Trust V, 3 month LIBOR, plus 1.435%
Debt Instrument
Long-term debt	10,310	10,310
IBERIABANK Corporation | Junior Subordinated Debt | Statutory Trust VI, 3 month LIBOR, plus 2.75%
Debt Instrument
Long-term debt	12,372	12,372
IBERIABANK Corporation | Junior Subordinated Debt | Statutory Trust VII, 3 month LIBOR, plus 2.54%
Debt Instrument
Long-term debt	13,403	13,403
IBERIABANK Corporation | Junior Subordinated Debt | Statutory Trust VIII, 3 month LIBOR, plus 3.50%
Debt Instrument
Long-term debt	7,217	7,217
IBERIABANK Corporation | Junior Subordinated Debt | OMNI Trust I, 3 month LIBOR, plus 3.30%
Debt Instrument
Long-term debt	8,248	8,248
IBERIABANK Corporation | Junior Subordinated Debt | OMNI Trust II, 3 Month LIBOR, plus 2.79%
Debt Instrument
Long-term debt	7,732	7,732
IBERIABANK Corporation | Junior Subordinated Debt | GA Commerce Trust II, 3 Month LIBOR, plus 1.64%
Debt Instrument
Long-term debt	$ 8,248	$ 0
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate
Debt Instrument
Three month LIBOR rate during period	0.61%	0.26%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | Statutory Trust I, 3 month LIBOR, plus 3.25%
Debt Instrument
Basis spread on variable rate	3.25%	3.25%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | Statutory Trust II, 3 month LIBOR, plus 3.15%
Debt Instrument
Basis spread on variable rate	3.15%	3.15%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | Statutory Trust III, 3 month LIBOR, plus 2.00%
Debt Instrument
Basis spread on variable rate	2.00%	2.00%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | Statutory Trust IV, 3 month LIBOR, plus 1.60%
Debt Instrument
Basis spread on variable rate	1.60%	1.60%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | American Horizons Statutory Trust I, 3 month LIBOR, plus 3.15%
Debt Instrument
Basis spread on variable rate	3.15%	3.15%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | Statutory Trust V, 3 month LIBOR, plus 1.435%
Debt Instrument
Basis spread on variable rate	1.435%	1.435%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | Statutory Trust VI, 3 month LIBOR, plus 2.75%
Debt Instrument
Basis spread on variable rate	2.75%	2.75%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | Statutory Trust VII, 3 month LIBOR, plus 2.54%
Debt Instrument
Basis spread on variable rate	2.54%	2.54%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | Statutory Trust VIII, 3 month LIBOR, plus 3.50%
Debt Instrument
Basis spread on variable rate	3.50%	3.50%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | OMNI Trust I, 3 month LIBOR, plus 3.30%
Debt Instrument
Basis spread on variable rate	3.30%	3.30%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | OMNI Trust II, 3 Month LIBOR, plus 2.79%
Debt Instrument
Basis spread on variable rate	2.79%	2.79%
IBERIABANK Corporation | Junior Subordinated Debt | 3 Month LIBOR Rate | GA Commerce Trust II, 3 Month LIBOR, plus 1.64%
Debt Instrument
Basis spread on variable rate	1.64%	1.64%

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Long-Term Debt (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument
Long-term debt		$ 340,447	$ 403,254
IBERIABANK
Debt Instrument
Long-term debt		$ 220,337	$ 291,392
IBERIABANK | Federal Home Loan Bank Notes
Debt Instrument
FHLB advance amortization period (in years, minimum)		2 years 6 months
FHLB advance amortization period (in years, maximum)		20 years
Weighted average advance rate on FHLB advances		3.79%	3.24%
Long-term debt		$ 136,628	$ 210,549
IBERIABANK | Federal Home Loan Bank Notes | Blanket Floating Lien
Debt Instrument
Additional advances available from FHLB		4,600,000
IBERIABANK | Federal Home Loan Bank Notes | Pledge of Investment Securities
Debt Instrument
Additional advances available from FHLB		1,200,000
IBERIABANK Corporation | Junior Subordinated Debt
Debt Instrument
Long-term debt		$ 120,110	$ 111,862
Debt Instrument term (in years)		30 years
Earliest call date after issue (in years)		5 years
Earliest interest payment deferral date (in years or 20 consecutive quarters)		5 years
Percent of subordinate debt excluded from Tier 1 regulatory capital requirements, Percentage		75.00%
Forecast | IBERIABANK Corporation | Junior Subordinated Debt
Debt Instrument
Percent of subordinate debt excluded from Tier 1 regulatory capital requirements, Percentage	25.00%

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Long-Term Debt - Maturities of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
2016	$ 34,789
2017	61,899
2018	21,057
2019	7,865
2020	16,308
2021 and thereafter	198,529
Total long-term debt	$ 340,447	$ 403,254

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Income Taxes - Schedule of Provision for Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current expense	$ 67,025	$ 69,612	$ 62,468
Deferred expense (benefit)	4,551	(25,027)	(35,930)
Tax credits	(11,268)	(12,012)	(11,690)
ASU 2014-01 Amortization on Low Income Housing Tax Credits	2,023	1,005	251
Tax benefits attributable to items charged to equity and goodwill	1,763	2,105	1,034
Total income tax expense	$ 64,094	$ 35,683	$ 16,133

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Income Taxes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Taxes payable	$ 13,000,000
Tax receivable, federal and state income taxes		$ 2,000,000
Federal statutory income tax rate	35.00%
Net tax benefit	$ (2,024,000)	(792,000)	$ 1,169,000
Decrease related to prior year taxes	1,300,000
Other discrete items	$ 600,000
Expiration period for net operating loss carryforwards (in years)	20 years
Valuation allowance	$ 0	0
Retained earnings of prior period	21,900,000	21,900,000
Interest or penalties recognized	$ 0	$ 0	$ 0

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Income Taxes - Reconciliation of Effective Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal tax based on statutory rate	$ 72,428	$ 49,373	$ 28,441
Effect of tax-exempt income	(6,919)	(7,064)	(7,282)
Interest and other nondeductible expenses	5,899	2,642	2,007
State taxes, net of federal benefit	3,955	2,531	3,237
Tax credits	(11,268)	(12,012)	(11,690)
ASU 2014-01 Amortization on Low Income Housing Tax Credits	2,023	1,005	251
Other	(2,024)	(792)	1,169
Total income tax expense	$ 64,094	$ 35,683	$ 16,133
Effective tax rate	31.00%	25.30%	19.90%

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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax asset:
NOL carryforward	$ 17,258	$ 978
Allowance for credit losses	56,446	59,267
Deferred compensation	7,528	6,631
Basis difference in acquired assets	48,256	53,202
Unrealized loss on securities available for sale	854	0
OREO	6,210	9,845
Other	10,438	13,530
Deferred tax assets	146,990	143,453
Deferred tax liability:
Basis difference in acquired assets	(31,975)	(53,940)
Gain on acquisition	(212)	(2,426)
FHLB stock	(122)	(85)
Premises and equipment	(1,658)	(9,652)
Acquisition intangibles	(7,648)	(12,151)
Deferred loan costs	(4,610)	(3,771)
Unrealized gain on securities available for sale	0	(4,052)
Investments acquired	(167)	(570)
Swap gain	0	(75)
Other	(16,694)	(12,908)
Deferred tax liabilities	(63,086)	(99,630)
Net deferred tax asset	$ 83,904	$ 43,823

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Capital Requirements and Other Regulatory Matters - Actual Capital Amounts and Ratios (Detail)		3 Months Ended	12 Months Ended
	Jan. 04, 2016 $ / shares	Sep. 30, 2015 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares
Total risk-based capital
Preferred stock, par value (in usd per share) | $ / shares			$ 1	$ 1
Liquidation preference (per share) | $ / shares			$ 10,000	$ 10,000
Consolidated
Tier 1 Leverage
Minimum amount			$ 751,798,000	$ 602,359,000
Minimum ratio			4.00%	4.00%
Actual amount			$ 1,790,034,000	$ 1,408,141,000
Actual ratio			9.52%	9.35%
Common Equity Tier 1 (CET1)
Minimum amount			$ 752,610,000
Minimum ratio			4.50%
Actual amount			$ 1,684,097,000
Actual ratio			10.07%
Tier 1 risk-based capital
Minimum amount			$ 1,003,479,000	$ 504,086,000
Minimum ratio			6.00%	4.00%
Actual amount			$ 1,790,034,000	$ 1,408,141,000
Actual ratio			10.70%	11.17%
Total risk-based capital
Minimum amount			$ 1,337,973,000	$ 1,008,171,000
Minimum ratio			8.00%	8.00%
Actual amount			$ 2,029,932,000	$ 1,550,088,000
Actual ratio			12.14%	12.30%
IBERIABANK
Tier 1 Leverage
Minimum amount			$ 749,226,000	$ 600,121,000
Minimum ratio			4.00%	4.00%
Well capitalized amount			$ 936,532,000	$ 750,151,000
Well capitalized ratio			5.00%	5.00%
Actual amount			$ 1,691,022,000	$ 1,265,540,000
Actual ratio			9.03%	8.44%
Common Equity Tier 1 (CET1)
Minimum amount			$ 750,660,000
Minimum ratio			4.50%
Well capitalized amount			$ 1,084,287,000
Well capitalized ratio			6.50%
Actual amount			$ 1,691,022,000
Actual ratio			10.14%
Tier 1 risk-based capital
Minimum amount			$ 1,000,880,000	$ 502,421,000
Minimum ratio			6.00%	4.00%
Well capitalized amount			$ 1,334,507,000	$ 753,631,000
Well capitalized ratio			8.00%	6.00%
Actual amount			$ 1,691,022,000	$ 1,265,540,000
Actual ratio			10.14%	10.08%
Total risk-based capital
Minimum amount			$ 1,334,507,000	$ 1,004,841,000
Minimum ratio			8.00%	8.00%
Well capitalized amount			$ 1,668,133,000	$ 1,256,052,000
Well capitalized ratio			10.00%	10.00%
Actual amount			$ 1,843,545,000	$ 1,407,487,000
Actual ratio			11.05%	11.21%
Dividend payable restriction			$ 148,700,000
Funds available for loans or advances to the parent			$ 184,400,000
Preferred Class B [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations
Depositary shares issued | shares		3,200,000
Ownership interest per share			0.0025
Liquidation preference per depositary share | $ / shares		25
Liquidation preference value		$ 80,000,000
Total risk-based capital
Ownership per share		6.625%
Preferred stock, par value (in usd per share) | $ / shares		$ 1
Liquidation preference (per share) | $ / shares		$ 10,000
Subsequent Event | Preferred Class B [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations
Dividend per share declared | $ / shares	$ 0.805
Three Month London Interbank Offered Rate [Member] | Preferred Class B [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations
Dividend spread			4.262%

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Earnings Per Share - Schedule of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings per common share - basic
Net income	$ 142,844	$ 105,382	$ 65,128
Dividends and undistributed earnings allocated to unvested restricted shares	(1,680)	(1,651)	(1,205)
Net income allocated to common shareholders - basic	$ 141,164	$ 103,731	$ 63,923
Weighted average common shares outstanding	38,214	31,307	29,052
Earnings per common share - basic (in usd per share)	$ 3.69	$ 3.31	$ 2.20
Earnings per common share - diluted
Net income allocated to common shareholders - basic	$ 141,164	$ 103,731	$ 63,923
Dividends and undistributed earnings allocated to unvested restricted shares	(48)	(34)	(4)
Earnings Allocated to Common Shareholders	$ 141,116	$ 103,697	$ 63,919
Weighted average common shares outstanding	38,214	31,307	29,052
Dilutive potential common shares	96	126	53
Weighted average common shares outstanding - diluted	38,310	31,433	29,105
Earnings per common share - diluted (in usd per share)	$ 3.68	$ 3.30	$ 2.20

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Earnings Per Share (Detail) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share
Weighted average number of shares held by Recognition and Retention Plan excluded from the calculation for basic shares outstanding	607,608	625,555	642,008
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from the computation of earnings per share	159,236	13,101	483,696

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Share-Based Compensation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Future awards shares under approved incentive compensation plans	784,254
Share-based compensation maximum option term (in years)	10 years
Contributions made by the company to 401(k) plan	$ 1.7	$ 1.5	$ 1.3
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award
Unearned share-based compensation associated with awards	$ 2.7
Unrecognized compensation cost related to stock options expected to be recognized over a weighted-average period	5 years 1 month 6 days
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award
Unearned share-based compensation associated with awards	$ 19.5	$ 19.8
Unrecognized compensation cost related to stock options expected to be recognized over a weighted-average period	2 years 8 months 12 days
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
Phantom Stock Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	5 years
Phantom Stock Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	7 years

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Share-Based Compensation - Activity Related to Stock Options (Detail) - Stock Option Awards - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of shares
Balance at beginning of the period (in shares)	867,682	1,072,829	1,236,075
Granted (in shares)	82,001	77,434	75,722
Exercised (in shares)	(119,917)	(267,421)	(200,748)
Forfeited or expired (in shares)	(15,989)	(15,160)	(38,220)
Balance at end of the period (in shares)	813,777	867,682	1,072,829
Exercisable at period end (in shares)	546,842	562,752	707,934
Weighted Average Exercise Price
Balance at beginning of the period (in usd per share)	$ 55.92	$ 53.47	$ 51.48
Granted (in usd per share)	62.50	65.31	52.36
Exercised (in usd per share)	51.71	48.57	40.35
Forfeited or expired (in usd per share)	66.52	60.38	55.87
Balance at end of the period (in usd per share)	56.99	55.92	53.47
Exercisable at period end (in usd per share)	$ 56.54	$ 55.92	$ 53.54
Aggregate Intrinsic Value (Dollars in thousands)
Exercised (in usd)	$ 1,516	$ 4,612	$ 2,740
Balance at end of period (in usd)	1,061
Exercisable at period end (in usd)	$ 665
Weighted Average Remaining Contract Life (in years)
Weighted average remaining contract life at period end (in years)	5 years 1 month 6 days
Exercisable at period end (in years)	3 years 10 months 24 days

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Share-Based Compensation - Compensation Expense Included in Non-Interest Expense and Related Income Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Phantom Stock and Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Compensation expense	$ 12,109	$ 5,496	$ 4,855
Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Compensation expense	12,045	9,932	8,593
Income tax benefit	4,215	3,476	3,008
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award
Compensation expense	1,861	2,053	2,110
Income tax benefit	$ 317	$ 375	$ 379

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Share-Based Compensation - Schedule of Weighted Average Remaining Life of Options Outstanding within Stated Exercise Prices (Detail) - Stock Option Awards	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Options Outstanding
Number of options (in shares) | shares	813,777
Weighted average exercise price (in usd per share)	$ 56.99
Weighted average remaining contract life (in years)	5 years 1 month 6 days
Options Exercisable
Number of Options (in shares) | shares	546,842
Weighted average exercise price (in usd per share)	$ 56.54
$36.48 to $51.69
Options Outstanding
Number of options (in shares) | shares	108,856
Weighted average exercise price (in usd per share)	$ 50.05
Weighted average remaining contract life (in years)	5 years 4 months 24 days
Options Exercisable
Number of Options (in shares) | shares	70,437
Weighted average exercise price (in usd per share)	$ 49.69
Minimum exercise price (in usd per share)	36.48
Maximum exercise price (in usd per share)	$ 51.69
$51.70 to $52.88
Options Outstanding
Number of options (in shares) | shares	170,627
Weighted average exercise price (in usd per share)	$ 52.34
Weighted average remaining contract life (in years)	6 years 6 months
Options Exercisable
Number of Options (in shares) | shares	86,365
Weighted average exercise price (in usd per share)	$ 52.34
Minimum exercise price (in usd per share)	51.70
Maximum exercise price (in usd per share)	$ 52.88
$52.89 to $56.26
Options Outstanding
Number of options (in shares) | shares	133,884
Weighted average exercise price (in usd per share)	$ 54.94
Weighted average remaining contract life (in years)	4 years 3 months 18 days
Options Exercisable
Number of Options (in shares) | shares	124,397
Weighted average exercise price (in usd per share)	$ 54.89
Minimum exercise price (in usd per share)	52.89
Maximum exercise price (in usd per share)	$ 56.26
$56.27 to $59.04
Options Outstanding
Number of options (in shares) | shares	121,591
Weighted average exercise price (in usd per share)	$ 57.53
Weighted average remaining contract life (in years)	1 year 2 months 12 days
Options Exercisable
Number of Options (in shares) | shares	119,855
Weighted average exercise price (in usd per share)	$ 57.52
Minimum exercise price (in usd per share)	56.27
Maximum exercise price (in usd per share)	$ 59.04
$59.05 to $62.39
Options Outstanding
Number of options (in shares) | shares	119,583
Weighted average exercise price (in usd per share)	$ 59.92
Weighted average remaining contract life (in years)	3 years 4 months 24 days
Options Exercisable
Number of Options (in shares) | shares	116,867
Weighted average exercise price (in usd per share)	$ 59.87
Minimum exercise price (in usd per share)	59.05
Maximum exercise price (in usd per share)	$ 62.39
$62.40 to $111.71
Options Outstanding
Number of options (in shares) | shares	159,236
Weighted average exercise price (in usd per share)	$ 65.83
Weighted average remaining contract life (in years)	8 years 2 months 12 days
Options Exercisable
Number of Options (in shares) | shares	28,921
Weighted average exercise price (in usd per share)	$ 75.41
Minimum exercise price (in usd per share)	62.40
Maximum exercise price (in usd per share)	$ 111.71

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Share-Based Compensation - Estimate Fair Value of Stock Option Awards with Weighted-Average Assumptions (Detail) - Stock Option Awards - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Expected dividends	2.20%	2.10%	2.60%
Expected volatility	35.60%	35.80%	34.80%
Risk-free interest rate	2.00%	2.30%	1.70%
Expected term (in years)	7 years 6 months	7 years 6 months	8 years 7 months 6 days
Weighted-average grant-date fair value	$ 19.57	$ 21.26	$ 15.37

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Share-Based Compensation - Unvested Restricted Stock Award Activity (Detail) - Restricted Stock And Restricted Stock Units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Balance at beginning of the period (in shares)	506,289	523,756	538,202
Granted (in shares)	207,575	168,254	167,095
Forfeited (in shares)	(26,970)	(18,171)	(28,713)
Earned and issued (in shares)	(179,764)	(167,550)	(152,828)
Balance at end of the period (in shares)	507,130	506,289	523,756
Weighted average grant date fair value (in usd per share)	$ 63.16	$ 65.11	$ 51.98
Fair value of restricted stock and restricted share units vested during the period	$ 11.3	$ 10.9	$ 7.8

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Share-Based Compensation - Schedule of Share and Dividend Equivalent Share Award Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of share equivalents
Balance at beginning of the period (in shares)	475,347	433,884	328,273
Granted (in shares)	167,573	146,166	179,041
Forfeited share equivalents (in shares)	(34,681)	(22,800)	(18,744)
Vested share equivalents (in shares)	(145,809)	(81,903)	(54,686)
Balance at end of the period (in shares)	462,430	475,347	433,884
Value of share equivalents
Balance at beginning of the period (in shares)	$ 30,826	$ 27,270	$ 16,125
Granted (in shares)	9,228	9,479	11,253
Forfeited share equivalents (in shares)	(1,910)	(1,479)	(1,178)
Vested share equivalents (in shares)	(9,288)	(5,512)	(2,937)
Balance at end of the period (in shares)	$ 25,466	$ 30,826	$ 27,270
Market price of Company's stock	$ 55.07	$ 64.85	$ 62.85

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Commitments and Contingencies (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Fair value of guarantees under commercial and standby letters of credit	$ 1.5	$ 1.3

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Commitments and Contingencies - Summary of Financial Instruments Outstanding (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Commitments to grant loans	$ 61,240	$ 161,350
Unfunded commitments under lines of credit	4,617,802	4,007,954
Commercial and standby letters of credit	150,281	134,882
Reserve for unfunded lending commitments	$ 14,145	$ 11,801	$ 11,147	$ 0

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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Assets
Securities available for sale, at fair value	$ 2,800,286,000	$ 2,158,853,000
Mortgage loans held for sale	166,247,000	139,950,000
Derivative instruments	24,393,000	28,798,000
Liabilities
Derivative instruments	18,058,000	15,411,000
Available-for-Sale Securities
Liabilities
Fair value assets transferred from Level 1 to Level 2	0	14,400,000
Recurring
Assets
Securities available for sale, at fair value	2,800,286,000	2,158,853,000
Mortgage loans held for sale	166,247,000	139,950,000
Derivative instruments	30,486,000	32,903,000
Total, Assets	2,997,019,000	2,331,706,000
Liabilities
Derivative instruments	24,939,000	31,354,000
Total	24,939,000	31,354,000
Recurring | Level 1
Assets
Securities available for sale, at fair value	0	0
Mortgage loans held for sale	0	0
Derivative instruments	0	0
Total, Assets	0	0
Liabilities
Derivative instruments	0	0
Total	0	0
Recurring | Level 2
Assets
Securities available for sale, at fair value	2,800,286,000	2,158,853,000
Mortgage loans held for sale	166,247,000	139,950,000
Derivative instruments	30,486,000	32,903,000
Total, Assets	2,997,019,000	2,331,706,000
Liabilities
Derivative instruments	24,939,000	31,354,000
Total	24,939,000	31,354,000
Recurring | Level 3
Assets
Securities available for sale, at fair value	0	0
Mortgage loans held for sale	0	0
Derivative instruments	0	0
Total, Assets	0	0
Liabilities
Derivative instruments	0	0
Total	$ 0	$ 0

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Fair Value Measurements - Gains and Losses Included in Earnings Related to Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Non-interest Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Total gains (losses) included in earnings	$ 2,939
Change in unrealized gains (losses) relating to assets still held at December 31, 2015	0
Other Comprehensive Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Total gains (losses) included in earnings	0
Change in unrealized gains (losses) relating to assets still held at December 31, 2015	$ (9,110)

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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - Nonrecurring - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
OREO, net	$ 1,106,000	$ 1,483,000
Total	1,106,000	1,483,000
Fair value of liabilities	0	0	$ 0
Level 1
Assets
OREO, net	0	0
Total	0	0
Level 2
Assets
OREO, net	1,106,000	1,483,000
Total	1,106,000	1,483,000
Level 3
Assets
OREO, net	0	0
Total	$ 0	$ 0

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Fair Value Measurements - Summary of Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance for Mortgage Loans Held for Sale (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Mortgages Held For Sale at Fair Value
Aggregate fair value	$ 166,247	$ 139,950
Aggregate unpaid principal	161,083	134,639
Aggregate fair value less unpaid principal	5,164	5,311
Total mortgage income (loss) in the Consolidated Statement of Comprehensive Income	$ 1,000	$ 3,500	$ 400

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Fair Value of Financial Instruments - Estimated Fair Values and Carrying Amounts of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial Assets
Cash and cash equivalents	$ 510,267	$ 548,095	$ 391,396	$ 970,977
Loans and loans held for sale, net of unearned income	14,493,675	11,581,116	9,620,461
FDIC loss share receivable	39,878	69,627	162,312
Derivative instruments	30,486	32,903
Financial Liabilities
Deposits	16,178,748	12,520,525	10,737,000
Short-term borrowings	326,617	845,742	$ 680,344
Long-term debt	340,447	403,254
Derivative instruments	24,939	31,354
Level 1
Financial Assets
Cash and cash equivalents	510,267	548,095
Investment securities	0	0
Loans and loans held for sale, net of unearned income	0	0
FDIC loss share receivable	0	0
Derivative instruments	0	0
Financial Liabilities
Deposits	0	0
Short-term borrowings	326,617	845,742
Long-term debt	0	0
Derivative instruments	0	0
Level 2
Financial Assets
Cash and cash equivalents	0	0
Investment securities	2,901,247	2,278,334
Loans and loans held for sale, net of unearned income	166,247	139,950
FDIC loss share receivable	0	0
Derivative instruments	30,486	32,903
Financial Liabilities
Deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Derivative instruments	24,939	31,354
Level 3
Financial Assets
Cash and cash equivalents	0	0
Investment securities	0	0
Loans and loans held for sale, net of unearned income	14,508,502	11,335,365
FDIC loss share receivable	9,163	19,606
Derivative instruments	0	0
Financial Liabilities
Deposits	15,696,245	12,298,017
Short-term borrowings	0	0
Long-term debt	309,847	376,139
Derivative instruments	0	0
Carrying Amount
Financial Assets
Cash and cash equivalents	510,267	548,095
Investment securities	2,899,214	2,275,813
Loans and loans held for sale, net of unearned income	14,355,297	11,450,985
FDIC loss share receivable	39,878	69,627
Derivative instruments	30,486	32,903
Financial Liabilities
Deposits	16,178,748	12,520,525
Short-term borrowings	326,617	845,742
Long-term debt	340,447	403,254
Derivative instruments	24,939	31,354
Fair Value
Financial Assets
Cash and cash equivalents	510,267	548,095
Investment securities	2,901,247	2,278,334
Loans and loans held for sale, net of unearned income	14,674,749	11,475,315
FDIC loss share receivable	9,163	19,606
Derivative instruments	30,486	32,903
Financial Liabilities
Deposits	15,696,245	12,298,017
Short-term borrowings	326,617	845,742
Long-term debt	309,847	376,139
Derivative instruments	$ 24,939	$ 31,354

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Business Segments (Detail)	12 Months Ended
	Dec. 31, 2015 Segment
Segment Reporting [Abstract]
Number of business segments	3

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Business Segments - Schedule of Segment Reporting Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information
Interest and dividend income	$ 646,858	$ 504,815	$ 437,197
Interest expense	59,100	44,704	46,953
Net interest income	587,758	460,111	390,244
Provision for loan losses	30,908	19,060	5,145
Mortgage income	81,122	51,797	64,197
Title revenue	22,837	20,492	20,526
Other non-interest income	116,434	101,339	84,235
Allocated expenses	0	0	0
Non-interest expense	570,305	473,614	472,796
Income before income tax expense	206,938	141,065	81,261
Income tax expense	64,094	35,683	16,133
Net Income	142,844	105,382	65,128
Total loans and loans held for sale, net of unearned income	14,493,675	11,581,116	9,620,461
Total assets	19,504,068	15,757,904	13,365,550
Total deposits	16,178,748	12,520,525	10,737,000
Average assets	18,402,706	14,631,994	13,003,988
Operating Segments | IBERIABANK
Segment Reporting Information
Interest and dividend income	639,793	498,820	431,418
Interest expense	56,222	42,983	45,150
Net interest income	583,571	455,837	386,268
Provision for loan losses	30,908	18,966	5,123
Mortgage income	1,426	71	2
Title revenue	0	0	0
Other non-interest income	116,443	101,401	84,243
Allocated expenses	(16,253)	(11,602)	(7,453)
Non-interest expense	495,158	412,165	406,380
Income before income tax expense	191,627	137,780	66,463
Income tax expense	58,006	34,352	10,299
Net Income	133,621	103,428	56,164
Total loans and loans held for sale, net of unearned income	14,305,663	11,415,973	9,472,908
Total assets	19,220,085	15,537,731	13,167,162
Total deposits	16,173,831	12,515,329	10,734,030
Average assets	18,146,216	14,430,768	12,794,997
Operating Segments | IMC
Segment Reporting Information
Interest and dividend income	7,062	5,992	5,747
Interest expense	2,878	1,721	1,803
Net interest income	4,184	4,271	3,944
Provision for loan losses	0	94	22
Mortgage income	79,696	51,726	64,195
Title revenue	0	0	0
Other non-interest income	(2)	(61)	(10)
Allocated expenses	12,036	8,203	5,417
Non-interest expense	57,784	44,761	49,723
Income before income tax expense	14,058	2,878	12,967
Income tax expense	5,581	1,148	5,093
Net Income	8,477	1,730	7,874
Total loans and loans held for sale, net of unearned income	188,012	165,143	147,553
Total assets	256,888	194,156	173,131
Total deposits	4,917	5,196	2,970
Average assets	230,819	176,003	183,513
Operating Segments | LTC
Segment Reporting Information
Interest and dividend income	3	3	32
Interest expense	0	0	0
Net interest income	3	3	32
Provision for loan losses	0	0	0
Mortgage income	0	0	0
Title revenue	22,837	20,492	20,526
Other non-interest income	(7)	(1)	2
Allocated expenses	4,217	3,399	2,036
Non-interest expense	17,363	16,688	16,693
Income before income tax expense	1,253	407	1,831
Income tax expense	507	183	741
Net Income	746	224	1,090
Total loans and loans held for sale, net of unearned income	0	0	0
Total assets	27,095	26,017	25,257
Total deposits	0	0	0
Average assets	$ 25,671	$ 25,223	$ 25,478

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Condensed Parent Company Only Financial Statements - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash in bank	$ 241,650	$ 251,994
Other assets	650,907	588,699
Total Assets	19,504,068	15,757,904	$ 13,365,550
Liabilities and Shareholders’ Equity
Liabilities	17,005,233	13,905,756
Shareholders’ equity	2,498,835	1,852,148	$ 1,530,346	$ 1,529,210
Total Liabilities and Shareholders’ Equity	19,504,068	15,757,904
IBERIABANK Corporation
Assets
Cash in bank	154,298	36,064
Investments in subsidiaries	2,449,325	1,841,420
Other assets	54,454	119,493
Total Assets	2,658,077	1,996,977
Liabilities and Shareholders’ Equity
Liabilities	159,242	144,829
Shareholders’ equity	2,498,835	1,852,148
Total Liabilities and Shareholders’ Equity	$ 2,658,077	$ 1,996,977

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Condensed Parent Company Only Financial Statements - Condensed Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating income
Other income	$ 36,725	$ 28,716	$ 23,597
Operating expenses
Interest expense	59,100	44,704	46,953
Salaries and employee benefits expense	322,586	259,086	244,984
Other expenses	37,343	32,921	31,731
Income (loss) before income tax benefit and increase in equity in undistributed earnings of subsidiaries	206,938	141,065	81,261
Income tax benefit	64,094	35,683	16,133
Net Income	142,844	105,382	65,128
IBERIABANK Corporation
Operating income
Dividends from bank subsidiary	0	0	49,000
Dividends from non-bank subsidiaries	0	0	1,511
Reimbursement of management expenses	59,255	46,433	34,474
Other income	(329)	437	869
Total operating income	58,926	46,870	85,854
Operating expenses
Interest expense	3,393	3,224	3,232
Salaries and employee benefits expense	41,689	31,981	29,159
Other expenses	17,492	14,576	13,651
Total operating expenses	62,574	49,781	46,042
Income (loss) before income tax benefit and increase in equity in undistributed earnings of subsidiaries	(3,648)	(2,911)	39,812
Income tax benefit	800	(518)	(2,808)
Income (loss) before equity in undistributed earnings of subsidiaries	(4,448)	(2,393)	42,620
Equity in undistributed earnings of subsidiaries	147,292	107,775	22,508
Net Income	$ 142,844	$ 105,382	$ 65,128

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Condensed Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flow from Operating Activities
Net Income	$ 142,844	$ 105,382	$ 65,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	(6,178)	23,327	19,423
Gain on sale of assets	(2,539)	(14)	(251)
Tax benefit associated with share-based payment arrangements	(580)	(2,105)	(886)
Other, net	12,873	(22,124)	76,431
Net Cash Provided by Operating Activities	196,123	119,363	309,783
Cash Flow from Investing Activities
Cash paid in excess of cash received for acquisitions	425,581	188,803	0
Proceeds from sale of premises and equipment	13,309	5,129	8,714
Purchases of premises and equipment, net of premises and equipment acquired	(19,502)	(29,841)	(16,941)
Net Cash Used in Investing Activities	(570,972)	(712,755)	(1,080,607)
Cash Flow from Financing Activities
Cash dividends paid on common stock	(52,318)	(43,070)	(40,332)
Proceeds from common stock transactions	5,535	11,693	8,101
Payments to repurchase common stock	(3,620)	(3,727)	(2,280)
Net proceeds from issuance of preferred stock	76,812	0	0
Tax benefit associated with share-based payment arrangements	580	2,105	886
Net Cash Provided by Financing Activities	337,021	750,091	191,243
Net (Decrease) Increase In Cash and Cash Equivalents	(37,828)	156,699	(579,581)
Cash and Cash Equivalents at Beginning of Period	548,095	391,396	970,977
Cash and Cash Equivalents at End of Period	510,267	548,095	391,396
IBERIABANK Corporation
Cash Flow from Operating Activities
Net Income	142,844	105,382	65,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	416	595	2,035
Net income of subsidiaries	(147,292)	(107,775)	(73,044)
Share-based compensation cost	13,906	11,985	10,703
Gain on sale of assets	(110)	0	0
Tax benefit associated with share-based payment arrangements	(580)	(2,105)	(886)
Other, net	82,105	(27,274)	7,575
Net Cash Provided by Operating Activities	91,289	(19,192)	11,511
Cash Flow from Investing Activities
Cash paid in excess of cash received for acquisitions	(5,054)	4,783	0
Proceeds from sale of premises and equipment	12	0	11,751
Purchases of premises and equipment, net of premises and equipment acquired	(2)	(36)	(5,247)
Return of capital from (Capital contributed to) subsidiary	5,000	(14,600)	0
Dividends received from subsidiaries	0	0	50,511
Net Cash Used in Investing Activities	(44)	(9,853)	57,015
Cash Flow from Financing Activities
Cash dividends paid on common stock	(52,318)	(43,070)	(40,332)
Proceeds from common stock transactions	5,535	11,693	8,101
Payments to repurchase common stock	(3,620)	(3,727)	(2,280)
Net proceeds from issuance of preferred stock	76,812	0	0
Tax benefit associated with share-based payment arrangements	580	2,105	886
Net Cash Provided by Financing Activities	26,989	(32,999)	(33,625)
Net (Decrease) Increase In Cash and Cash Equivalents	118,234	(62,044)	34,901
Cash and Cash Equivalents at Beginning of Period	36,064	98,108	63,207
Cash and Cash Equivalents at End of Period	$ 154,298	$ 36,064	$ 98,108