10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

ý Quarterly Report Pursuant to Section13 or 15(d) of the Securities Exchange Act of 1934.

For the quarterly period ended March 31, 2015.

or

¨
Transition Report Pursuant to Section13 or 15(d) of the Securities Exchange Act of 1934.

For the transition period fromto.

Commission file number 001-35854

Independent Bank Group, Inc.

(Exact name of registrant as specified in its charter)

Texas	13-4219346
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1600 Redbud Boulevard, Suite 400 McKinney, Texas	75069-3257
(Address of principal executive offices)	(Zip Code)

(972) 562-9004

(Registrant’s telephone number, including area code)

Not applicable

(Former name, former address and former fiscal year, if changed since last report)

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 such shorter periods that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YesýNo¨

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). YesýNo¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. Check One:

Large accelerated filer	¨	Accelerated filer	ý
Non-accelerated filer	¨	Smaller reporting company	¨

Indicate by a check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes¨Noý

Applicable Only to Corporate Issuers

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practical date.

Common Stock, Par Value $0.01 Per Share – 17,119,376 shares as of April 30, 2015.

INDEPENDENT BANK GROUP, INC. AND SUBSIDIARIES

Form 10-Q

March 31, 2015

PART I.	Financial Information
Item 1.	Financial Statements
	Consolidated Balance Sheets-Unaudited	1
	Consolidated Statements of Income-Unaudited	2
	Consolidated Statements of Comprehensive Income-Unaudited	3
	Consolidated Statements of Changes in Stockholders’ Equity-Unaudited	4
	Consolidated Statements of Cash Flows-Unaudited	5
	Notes to Consolidated Financial Statements-Unaudited	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	45
Item 4.	Controls and Procedures	46
PART II.	Other Information	46
Item 1.	Legal Proceedings	47
Item 1a.	Risk Factors	47
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds	47
Item 3.	Defaults Upon Senior Securities	47
Item 4.	Mine Safety Disclosures	47
Item 5.	Other Information	47
Item 6.	Exhibits	48
Signatures

***

Independent Bank Group, Inc. and Subsidiaries

Consolidated Balance Sheets

March 31, 2015 and December 31, 2014 (unaudited)

(Dollars in thousands, except share information)

	March 31,		December 31,
Assets	2015		2014
Cash and due from banks	$	136,525	$	153,158
Interest-bearing deposits in other banks	222,273		170,889
Cash and cash equivalents	358,798		324,047
Securities available for sale (amortized cost of $193,983 and $203,277, respectively)	198,149		206,062
Loans held for sale	7,034		4,453
Loans, net of allowance for loan losses of $20,227 and $18,552, respectively	3,283,021		3,182,045
Premises and equipment, net	88,163		88,902
Other real estate owned	4,587		4,763
Federal Home Loan Bank (FHLB) of Dallas stock and other restricted stock	12,333		12,321
Bank-owned life insurance (BOLI)	40,054		39,784
Deferred tax asset	2,351		2,235
Goodwill	229,639		229,457
Core deposit intangible, net	12,083		12,455
Other assets	22,152		26,115
Total assets	$	4,258,364	$	4,132,639
Liabilities and Stockholders’ Equity
Deposits:
Noninterest-bearing	$	806,912	$	818,022
Interest-bearing	2,579,766		2,431,576
Total deposits	3,386,678		3,249,598
FHLB advances	219,386		229,405
Repurchase agreements	5,783		4,012
Other borrowings	68,785		69,410
Other borrowings, related parties	3,320		3,320
Junior subordinated debentures	18,147		18,147
Other liabilities	5,537		17,896
Total liabilities	3,707,636		3,591,788
Commitments and contingencies
Stockholders’ equity:
Series A preferred stock (23,938.35 shares issued and outsanding)	23,938		23,938
Common stock (17,119,793 and 17,032,669 shares outstanding, respectively)	171		170
Additional paid-in capital	477,564		476,609
Retained earnings	45,754		37,731
Accumulated other comprehensive income	3,301		2,403
Total stockholders’ equity	550,728		540,851
Total liabilities and stockholders’ equity	$	4,258,364	$	4,132,639

See Notes to Consolidated Financial Statements

1

Independent Bank Group, Inc. and Subsidiaries

Consolidated Statements of Income

Three Months Ended March 31, 2015 and 2014 (unaudited)

(Dollars in thousands, except per share information)

	Three months ended March 31,
	2015		2014
Interest income:
Interest and fees on loans	$	39,580	$	24,123
Interest on taxable securities	609		699
Interest on nontaxable securities	414		257
Interest on federal funds sold and other	133		83
Total interest income	40,736		25,162
Interest expense:
Interest on deposits	2,709		1,907
Interest on FHLB advances	752		852
Interest on repurchase agreements and other borrowings	1,069		135
Interest on junior subordinated debentures	128		133
Total interest expense	4,658		3,027
Net interest income	36,078		22,135
Provision for loan losses	1,670		1,253
Net interest income after provision for loan losses	34,408		20,882
Noninterest income:
Service charges on deposit accounts	1,805		1,211
Mortgage fee income	1,300		730
Gain on sale of other real estate	130		39
Increase in cash surrender value of BOLI	270		149
Other	461		205
Total noninterest income	3,966		2,334
Noninterest expense:
Salaries and employee benefits	14,424		9,134
Occupancy	3,910		2,538
Data processing	688		496
FDIC assessment	519		304
Advertising and public relations	346		234
Communications	539		320
Net other real estate owned expenses (including taxes)	59		79
Operations of IBG Adriatica, net	—		23
Core deposit intangible amortization	372		199
Professional fees	490		368
Acquisition expense, including legal	472		476
Other	2,567		1,905
Total noninterest expense	24,386		16,076
Income before taxes	13,988		7,140
Income tax expense	4,536		2,339
Net income	$	9,452	$	4,801
Basic earnings per share	$	0.55	$	0.38
Diluted earnings per share	$	0.55	$	0.38

See Notes to Consolidated Financial Statements

2

Independent Bank Group, Inc. and Subsidiaries

Consolidated Statements of Comprehensive Income

Three Months Ended March 31, 2015 and 2014 (unaudited)

(Dollars in thousands)

	Three Months Ended March 31,
	2015		2014
Net income	$	9,452	$	4,801
Other comprehensive income before tax:
Change in net unrealized gains on available for sale securities during the year	1,381		2,429
Reclassification adjustment for loss on sale of securities available for sale included in net income	—		—
Other comprehensive income before tax	1,381		2,429
Income tax expense	483		850
Other comprehensive income, net of tax	898		1,579
Comprehensive income	$	10,350	$	6,380

See Notes to Consolidated Financial Statements

3

Independent Bank Group, Inc. and Subsidiaries

Consolidated Statements of Changes in Stockholders’ Equity

Three Months EndedMarch 31, 2015 and 2014 (unaudited)

(Dollars in thousands, except for par value, share and per share information)

	Series A Preferred Stock $.01 Par Value 10 million shares authorized		Common Stock $.01 Par Value 100 million shares authorized			Additional Paid in Capital			Retained Earnings			Treasury Stock		Accumulated Other Comprehensive Income (Loss)			Total
			Shares	Amount
Balance, December 31, 2014	$	23,938	17,032,669	$	170	$	476,609		$	37,731		$	—	$	2,403		$	540,851
Net income	—		—	—		—			9,452			—		—			9,452
Other comprehensive income, net of tax	—		—	—		—			—			—		898			898
Offering costs related to acquired bank	—		—	—		(144		)	—			—		—			(144		)
Restricted stock granted	—		87,124	1		(1		)	—			—		—			—
Stock based compensation expense	—		—	—		1,097			—			—		—			1,097
Excess tax benefit on restricted stock vested	—		—	—		3			—			—		—			3
Preferred stock dividends	—		—	—		—			(60		)	—		—			(60		)
Cash dividends ($0.08 per share)	—		—	—		—			(1,369		)	—		—			(1,369		)
Balance, March 31, 2015	$	23,938	17,119,793	$	171	$	477,564		$	45,754		$	—	$	3,301		$	550,728
Balance, December 31, 2013	$	—	12,330,158	$	123	$	222,116		$	12,663		$	—	$	(1,130	)	$	233,772
Net income	—		—	—		—			4,801			—		—			4,801
Other comprehensive (loss), net of tax	—		—	—		—			—			—		1,579			1,579
Common stock issued for acquisition of bank	—		235,594	3		11,697			—			—		—			11,700
Restricted stock granted	—		27,183	—		—			—			—		—			—
Excess tax benefit on restricted stock vested	—		—	—		1,022			—			—		—			1,022
Stock based compensation expense	—		—	—		390			—			—		—			390
Cash dividends ($0.06 per share)	—		—	—		—			(756		)	—		—			(756		)
Balance, March 31, 2014	$	—	12,592,935	$	126	$	235,225		$	16,708		$	—	$	449		$	252,508

See Notes to Consolidated Financial Statements 

4

Independent Bank Group, Inc. and Subsidiaries

Consolidated Statements of Cash Flows

Three Months EndedMarch 31, 2015 and 2014 (unaudited)

(Dollars in thousands)

	Three Months Ended March 31,
	2015			2014
Cash flows from operating activities:
Net income	$	9,452		$	4,801
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	1,521			1,145
Amortization of core deposit intangibles	372			199
Amortization of premium on securities, net	426			394
Stock based compensation expense	1,097			390
FHLB stock dividends	(12		)	(9		)
Gain recognized on other real estate transactions	(130		)	(39		)
Deferred tax (benefit) expense	(599		)	173
Provision for loan losses	1,670			1,253
Increase in cash surrender value of life insurance	(270		)	(149		)
Loans originated for sale	(55,984		)	(28,070		)
Proceeds from sale of loans	53,403			29,262
Net change in other assets	6,446			1,012
Net change in other liabilities	(13,081		)	(3,326		)
Net cash provided by operating activities	4,311			7,036
Cash flows from investing activities:
Proceeds from maturities, calls and pay downs of securities available for sale	8,868			20,941
Purchases of securities available for sale	—			(8,667		)
Net purchases of FHLB stock	—			491
Net loans originated	(102,646		)	(99,556		)
Additions to premises and equipment	(2,782		)	(282		)
Proceeds from sale of premises and equipment	—			11
Proceeds from sale of other real estate owned	316			552
Capitalized additions to other real estate	(10		)	(28		)
Cash received from acquired banks	—			32,246
Cash paid in connection with acquisitions	—			(10,000		)
Net cash used in investing activities	(96,254		)	(64,292		)
Cash flows from financing activities:
Net increase in demand deposits, NOW and savings accounts	98,901			26,181
Net increase in time deposits	38,179			48,712
Net change in FHLB advances	(10,019		)	(13,022		)
Net change in repurchase agreements	1,771			802
Repayments of other borrowings	(625		)	—
Offering costs paid in connection with acquired banks	(144		)	—
Dividends paid	(1,369		)	(756		)
Net cash provided by financing activities	126,694			61,917
Net change in cash and cash equivalents	34,751			4,661
Cash and cash equivalents at beginning of year	324,047			93,054
Cash and cash equivalents at end of period	$	358,798		$	97,715

See Notes to Consolidated Financial Statements 

5

Independent Bank Group, Inc. and Subsidiaries

Notes to Consolidated Financial Statements (unaudited)

(Dollars in thousands, except for share and per share information)

Note 1. Summary of Significant Accounting Policies

Nature of Operations: Independent Bank Group, Inc. (IBG) through its subsidiary, Independent Bank, a Texas state banking corporation (Bank) (collectively known as the Company), provides a full range of banking services to individual and corporate customers in the North Texas, Central Texas and Houston areas through its various branch locations in those areas. The Company is engaged in traditional community banking activities, which include commercial and retail lending, deposit gathering, investment and liquidity management activities. The Company’s primary deposit products are demand deposits, money market accounts and certificates of deposit, and its primary lending products are commercial business and real estate, real estate mortgage and consumer loans.

Basis of Presentation: The accompanying consolidated financial statements include the accounts of IBG, its wholly-owned subsidiaries, the Bank and IBG Adriatica Holdings, Inc. (Adriatica) and the Bank’s wholly-owned subsidiaries, IBG Real Estate Holdings, Inc. and IBG Aircraft Acquisition, Inc. Adriatica was formed in 2011 to acquire a mixed use residential and retail real estate development in McKinney, Texas. Adriatica was dissolved during the first quarter of 2014. All material intercompany transactions and balances have been eliminated in consolidation. In addition, the Company wholly-owns IB Trust I (Trust I), IB Trust II (Trust II), IB Trust III (Trust III), IB Centex Trust I (Centex Trust I) and Community Group Statutory Trust I (CGI Trust I). The Trusts were formed to issue trust preferred securities and do not meet the criteria for consolidation.

The consolidated interim financial statements are unaudited, but include all adjustments, which, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in the Company's Annual Report of Form10-K for the year ended December 31, 2014. The consolidated statement of condition at December 31, 2014 had been derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements.

Segment Reporting: The Company has one reportable segment. The Company’s chief operating decision-maker uses consolidated results to make operating and strategic decisions.

Subsequent events: Companies are required to evaluate events and transactions that occur after the balance sheet date but before the date the financial statements are issued. They must recognize in the financial statements the effect of all events or transactions that provide additional evidence of conditions that existed at the balance sheet date, including the estimates inherent in the financial statement preparation process. Entities shall not recognize the impact of events or transactions that provide evidence about conditions that did not exist at the balance sheet date but arose after that date. The Company has evaluated subsequent events through the date of filing these financial statements with the SEC and noted no subsequent events requiring financial statement recognition or disclosure, except as disclosed in Note 12.

Earnings per share: Basic earnings per common share are net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. The unvested share-based payment awards that contain rights to non forfeitable dividends are considered participating securities for this calculation. Diluted earnings per common share include the dilutive effect of additional potential common shares issuable under stock warrants. The dilutive effect of participating non vested common stock was not included as it was anti-dilutive. Proceeds from the assumed exercise of dilutive stock warrants are assumed to be used to repurchase common stock at the average market price.

6

	Three Months Ended March 31,
	2015			2014
Basic earnings per share:
Net income	$	9,452		$	4,801
Less: Preferred stock dividends	(60		)	—
Net income after preferred stock dividends	9,392			4,801
Less:
Undistributed earnings allocated to participating securities	178			58
Dividends paid on participating securities	30			11
Net income available to common shareholders	$	9,184		$	4,732
Weighted-average basic shares outstanding	16,712,527			12,403,387
Basic earnings per share	$	0.55		$	0.38
Diluted earnings per share:
Net income available to common shareholders	$	9,184		$	4,732
Total weighted-average basic shares outstanding	16,712,527			12,403,387
Add dilutive stock warrants	77,933			101,643
Total weighted-average diluted shares outstanding	16,790,460			12,505,030
Diluted earnings per share	$	0.55		$	0.38
Anti-dilutive participating securities	19,705			109,040

7

Note 2. Statement of Cash Flows

As allowed by the accounting standards, the Company has chosen to report on a net basis its cash receipts and cash payments for time deposits accepted and repayments of those deposits, and loans made to customers and principal collections on those loans. The Company uses the indirect method to present cash flows from operating activities. Other supplemental cash flow information is presented below:

	Three Months Ended March 31,
	2015		2014
Cash transactions:
Interest expense paid	$	5,754	$	3,045
Income taxes paid	$	6,150	$	2,700
Noncash transactions:
Accrued preferred stock dividends	$	60	$	—
Transfers of loans to other real estate owned	$	—	$	120
Loans to facilitate the sale of other real estate owned	$	—	$	48
Securities purchased, not yet settled	$	—	$	2,000
Excess tax benefit on restricted stock vested	$	3	$	1,022

The supplemental schedule of noncash investing activities from Company acquisition activity is as follows:

	Three Months Ended March 31,
	2015		2014
Noncash assets acquired
Cash and cash equivalents	$	—	$	32,246
Securities available for sale	—		16,740
Loans	—		71,138
Premises and equipment	—		2,600
Goodwill	—		7,122
Core deposit intangibles	—		882
Other assets	—		230
Total assets	$	—	$	130,958
Noncash liabilities assumed:
Deposits	$	—	$	104,960
Repurchase agreements	—		3,733
Other liabilities	—		565
Total liabilities	$	—	$	109,258
Cash paid to shareholders of acquired banks	$	—	$	10,000
Fair value of common stock issued to shareholders of acquired bank	$	—	$	11,700

8

In addition, the following measurement-period adjustments were made during the period relating to Company acquisition activity:

	Three Months Ended March 31,
	2015		2014
Noncash assets acquired:
Loans	$	—	$	(328	)
Goodwill	182		749
Core deposit intangibles	—		(18		)
Deferred tax asset	—		109
Other assets	—		10
Total assets	$	182	$	522
Noncash liabilities assumed:
Deposits	$	—	$	505
Other liabilities	182		17
Total liabilities	$	182	$	522

Note 3. Securities Available for Sale

Securities available for sale have been classified in the consolidated balance sheets according to management’s intent. The amortized cost of securities and their approximate fair values at March 31, 2015 and December 31, 2014, are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Securities Available for Sale
March 31, 2015:
U.S. treasuries	$	999	$	9	$	—		$	1,008
Government agency securities	53,964		446		(121		)	54,289
Obligations of state and municipal subdivisions	73,587		2,121		(301		)	75,407
Corporate bonds	1,066		32		—			1,098
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	64,367		1,981		(1		)	66,347
	$	193,983	$	4,589	$	(423	)	$	198,149
December 31, 2014:
U.S. treasuries	$	999	$	7	$	—		$	1,006
Government agency securities	58,174		199		(350		)	58,023
Obligations of state and municipal subdivisions	75,599		1,837		(537		)	76,899
Corporate bonds	1,068		13		—			1,081
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	67,437		1,616		—			69,053
	$	203,277	$	3,672	$	(887	)	$	206,062

Securities with a carrying amount of approximately $141,091 and $174,741 at March 31, 2015 and December 31, 2014, respectively, were pledged to secure public fund deposits and repurchase agreements.

There were no sales of securities during the three months ended March 31, 2015 and 2014.

9

The amortized cost and estimated fair value of securities available for sale at March 31, 2015, by contractual maturity, are shown below. Maturities of pass-through certificates will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.   

	March 31, 2015
	Securities Available for Sale
	Amortized Cost		Fair Value
Due in one year or less	$	2,801	$	2,803
Due from one year to five years	49,616		49,743
Due from five to ten years	36,768		37,433
Thereafter	40,431		41,823
	129,616		131,802
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	64,367		66,347
	$	193,983	$	198,149

The number of securities, unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of March 31, 2015 and December 31, 2014, are summarized as follows:   

	Less Than 12 Months						Greater Than 12 Months						Total
Description of Securities	Number of Securities	Estimated Fair Value		Unrealized Losses			Number of Securities	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
Securities Available for Sale
March 31, 2015
Government agency securities	—	$	—	$	—		12	$	20,877	$	(121	)	$	20,877	$	(121	)
Obligations of state and municipal subdivisions	9	3,597		(11		)	25	11,990		(290		)	15,587		(301		)
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	1	93		(1		)	—	—		—			93		(1		)
	10	$	3,690	$	(12	)	37	$	32,867	$	(411	)	$	36,557	$	(423	)
December 31, 2014
Government agency securities	6	$	6,396	$	(24	)	14	$	22,671	$	(326	)	$	29,067	$	(350	)
Obligations of state and municipal subdivisions	44	16,636		(197		)	13	8,541		(340		)	25,177		(537		)
	50	$	23,032	$	(221	)	27	$	31,212	$	(666	)	$	54,244	$	(887	)

Unrealized losses are generally due to changes in interest rates. The Company has the intent to hold these securities until maturity or a forecasted recovery, and it is more likely than not that the Company will not have to sell the securities before the recovery of their cost basis. As such, the losses are deemed to be temporary.   

10

Note 4. Loans, Net and Allowance for Loan Losses

Loans, net at March 31, 2015 and December 31, 2014, consisted of the following:

	March 31,			December 31,
	2015			2014
Commercial	$	697,449		$	672,052
Real estate:
Commercial	1,555,462			1,450,434
Commercial construction, land and land development	301,944			334,964
Residential	515,716			514,025
Single family interim construction	148,202			138,278
Agricultural	37,650			38,822
Consumer	47,387			52,267
Other	139			242
	3,303,949			3,201,084
Deferred loan fees	(701		)	(487		)
Allowance for loan losses	(20,227		)	(18,552		)
	$	3,283,021		$	3,182,045

The Company has certain lending policies and procedures in place that are designed to maximize loan income within an acceptable level of risk. Management reviews and approves these policies and procedures on a regular basis. A reporting system supplements the review process by providing management with frequent reports related to loan production, loan quality, concentrations of credit, loan delinquencies and non-performing and potential problem loans.

Commercial loans are underwritten after evaluating and understanding the borrower’s ability to operate profitably and prudently expand its business. The Company’s management examines current and projected cash flows to determine the ability of the borrower to repay their obligations as agreed. Commercial loans are primarily made based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. These cash flows, however, may not be as expected and the value of collateral securing the loans may fluctuate. Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee; however, some short term loans may be made on an unsecured basis. Additionally, our commercial loan portfolio includes loans made to customers in the energy industry, which is a complex, technical and cyclical industry. Experienced bankers with specialized energy lending experience originate our energy loans. Companies in this industry produce, extract, develop, exploit and explore for oil and natural gas. Loans are primarily collateralized with proven producing oil and gas reserves based on a technical evaluation of these reserves. At March 31, 2015 and December 31, 2014, there were approximately $239.0 million and $231.7 million of exploration and production (E&P) energy loans outstanding, respectively.

Commercial real estate loans are subject to underwriting standards and processes similar to commercial loans. These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate lending typically involves higher loan principal amounts, and the repayment of these loans is generally largely dependent on the successful operation of the property or the business conducted on the property securing the loan. Commercial real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. The properties securing the Company’s commercial real estate portfolio are diverse in terms of type and geographic location. Management monitors the diversification of the portfolio on a quarterly basis by type and geographic location. Management also tracks the level of owner occupied property versus non owner occupied property.

Land and commercial land development loans are underwritten using feasibility studies, independent appraisal reviews and financial analysis of the developers or property owners. Generally, borrowers must have a proven track record of success. Commercial construction loans are generally based upon estimates of cost and value of the completed project. These estimates may not be accurate. Commercial construction loans often involve the disbursement of substantial funds with the repayment dependent on the success of the ultimate project. Sources of repayment for these loans may be pre-committed permanent financing or sale of the developed property. The loans in this portfolio are geographically diverse and due to the increased risk are monitored closely by management and the board of directors on a quarterly basis.

11

Residential real estate and single family interim construction loans are underwritten primarily based on borrowers’ credit scores, documented income and minimum collateral values. Relatively small loan amounts are spread across many individual borrowers, which minimizes risk in the residential portfolio. In addition, management evaluates trends in past dues and current economic factors on a regular basis.

Agricultural loans are collateralized by real estate and/or agricultural-related assets. Agricultural real estate loans are primarily comprised of loans for the purchase of farmland. Loan-to-value ratios on loans secured by farmland generally do not exceed 80% and have amortization periods limited to twenty years. Agricultural non-real estate loans are generally comprised of term loans to fund the purchase of equipment, livestock and seasonal operating lines to grain farmers to plant and harvest corn and soybeans. Specific underwriting standards have been established for agricultural-related loans, including the establishment of projections for each operating year based on industry developed estimates of farm input costs and expected commodity yields and prices. Operating lines are typically written for one year and secured by the crop and other farm assets as considered necessary.

Agricultural loans carry significant credit risks as they involve larger balances concentrated with single borrowers or groups of related borrowers. In addition, repayment of such loans depends on the successful operation or management of the farm property securing the loan or for which an operating loan is utilized. Farming operations may be affected by adverse weather conditions such as drought, hail or floods that can severely limit crop yields.

Consumer loans represent less than 2% of the outstanding total loan portfolio. Collateral consists primarily of automobiles and other personal assets. Credit score analysis is used to supplement the underwriting process.

Most of the Company’s lending activity occurs within the State of Texas, primarily in the north, central and southeast Texas regions. A large percentage of the Company’s portfolio consists of commercial and residential real estate loans. As of March 31, 2015 and December 31, 2014, there were no concentrations of loans related to a single industry in excess of 10% of total loans.

The allowance for loan losses is an amount that management believes will be adequate to absorb estimated losses relating to specifically identified loans, as well as probable credit losses inherent in the balance of the loan portfolio.

The allowance is derived from the following two components: 1) allowances established on individual impaired loans, which are based on a review of the individual characteristics of each loan, including the customer’s ability to repay the loan, the underlying collateral values, and the industry in which the customer operates, and 2) allowances based on actual historical loss experience for the last three years for similar types of loans in the Company’s loan portfolio adjusted for primarily changes in the lending policies and procedures; collection, charge-off and recovery practices; nature and volume of the loan portfolio; volume and severity of nonperforming loans; existence and effect of any concentrations of credit and the level of such concentrations and current, national and local economic and business conditions. This second component also includes an unallocated allowance to cover uncertainties that could affect management’s estimate of probable losses. The unallocated allowance reflects the imprecision inherent in the underlying assumptions used in the methodologies for estimating this component.

The Company’s management continually evaluates the allowance for loan losses determined from the allowances established on individual loans and the amounts determined from historical loss percentages adjusted for the qualitative factors above. Should any of the factors considered by management change, the Company’s estimate of loan losses could also change and would affect the level of future provision expense. While the calculation of the allowance for loan losses utilizes management’s best judgment and all the information available, the adequacy of the allowance for loan losses is dependent on a variety of factors beyond the Company’s control, including, among other things, the performance of the entire loan portfolio, the economy, changes in interest rates and the view of regulatory authorities towards loan classifications.

In addition, regulatory agencies, as an integral part of their examination process, periodically review the Bank’s allowance for loan losses, and may require the Bank to make additions to the allowance based on their judgment about information available to them at the time of their examinations.

12

Loans requiring an allocated loan loss provision are generally identified at the servicing officer level based on review of weekly past due reports and/or the loan officer’s communication with borrowers. In addition, past due loans are discussed at weekly officer loan committee meetings to determine if classification is warranted. The Company’s credit department has implemented an internal risk based loan review process to identity potential internally classified loans that supplements the annual independent external loan review. The external review generally covers all loans greater than $2.4 million. These reviews include analysis of borrower’s financial condition, payment histories and collateral values to determine if a loan should be internally classified. Generally, once classified, an impaired loan analysis is completed by the credit department to determine if the loan is impaired and the amount of allocated allowance required.

The Texas economy, specifically the Company’s lending area of north, central and southeast Texas, has generally performed better than certain other parts of the country. However, the recent drop in oil prices has the potential to have negative impact on the Texas economy. The risk of loss associated with all segments of the portfolio could increase due to this impact.

The economy and other risk factors are minimized by the Company’s underwriting standards, which include the following principles: 1) financial strength of the borrower including strong earnings, high net worth, significant liquidity and acceptable debt to worth ratio, 2) managerial business competence, 3) ability to repay, 4) loan to value, 5) projected cash flow and 6) guarantor financial statements as applicable. The following is a summary of the activity in the allowance for loan losses by loan class for the three months ended March 31, 2015 and 2014:

	Commercial			Commercial Real Estate, Land and Land Development			Residential Real Estate			Single-Family Interim Construction			Agricultural			Consumer			Other		Unallocated		Total
Three months ended March 31, 2015
Balance at the beginning of period	$	5,051		$	10,110		$	2,205		$	669		$	246		$	146		$	—	$	125	$	18,552
Provision for loan losses	1,023			526			(13		)	65			(8		)	29			—		48		1,670
Charge-offs	—			—			—			—			—			(36		)	—		—		(36		)
Recoveries	4			18			2			—			—			17			—		—		41
Balance at end of period	$	6,078		$	10,654		$	2,194		$	734		$	238		$	156		$	—	$	173	$	20,227
Three months ended March 31, 2014
Balance at the beginning of period	$	2,401		$	7,872		$	2,440		$	577		$	238		$	363		$	—	$	69	$	13,960
Provision for loan losses	578			256			(163		)	(42		)	6			(6		)	—		624		1,253
Charge-offs	(363		)	(21		)	(1		)	—			—			(14		)	—		—		(399		)
Recoveries	4			10			2			1			—			10			—		—		27
Balance at end of period	$	2,620		$	8,117		$	2,278		$	536		$	244		$	353		$	—	$	693	$	14,841

13

The following table details the amount of the allowance for loan losses and recorded investment in loans by class as of March 31, 2015 and December 31, 2014:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Unallocated		Total
March 31, 2015
Allowance for losses:
Individually evaluated for impairment	$	1,120	$	64	$	—	$	—	$	—	$	—	$	—	$	—	$	1,184
Collectively evaluated for impairment	4,958		10,590		2,194		734		238		156		—		173		19,043
Loans acquired with deteriorated credit quality	—		—		—		—		—		—		—		—		—
Ending balance	$	6,078	$	10,654	$	2,194	$	734	$	238	$	156	$	—	$	173	$	20,227
Loans:
Individually evaluated for impairment	$	5,899	$	6,486	$	3,216	$	—	$	—	$	76	$	—	$	—	$	15,677
Collectively evaluated for impairment	688,120		1,801,261		510,777		148,202		37,650		47,286		139		—		3,233,435
Acquired with deteriorated credit quality	3,430		49,659		1,723		—		—		25		—		—		54,837
Ending balance	$	697,449	$	1,857,406	$	515,716	$	148,202	$	37,650	$	47,387	$	139	$	—	$	3,303,949
December 31, 2014
Allowance for losses:
Individually evaluated for impairment	$	339	$	124	$	8	$	—	$	—	$	4	$	—	$	—	$	475
Collectively evaluated for impairment	4,712		9,986		2,197		669		246		142		—		125		18,077
Loans acquired with deteriorated credit quality	—		—		—		—		—		—		—		—		—
Ending balance	$	5,051	$	10,110	$	2,205	$	669	$	246	$	146	$	—	$	125	$	18,552
Loans:
Individually evaluated for impairment	$	1,479	$	6,768	$	3,387	$	—	$	—	$	75	$	—	$	—	$	11,709
Collectively evaluated for impairment	666,830		1,724,514		508,833		138,278		38,822		52,159		242		—		3,129,678
Acquired with deteriorated credit quality	3,743		54,116		1,805		—		—		33		—		—		59,697
Ending balance	$	672,052	$	1,785,398	$	514,025	$	138,278	$	38,822	$	52,267	$	242	$	—	$	3,201,084

14

Nonperforming loans by loan class at March 31, 2015 and December 31, 2014, are summarized as follows:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
March 31, 2015
Nonaccrual loans	$	5,873	$	57	$	631	$	—	$	—	$	71	$	—	$	6,632
Loans past due 90 days and still accruing	—		—		—		—		—		—		—		—
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	27		4,426		2,571		—		—		5		—		7,029
	$	5,900	$	4,483	$	3,202	$	—	$	—	$	76	$	—	$	13,661
December 31, 2014
Nonaccrual loans	$	1,449	$	70	$	2,117	$	—	$	—	$	67	$	—	$	3,703
Loans past due 90 days and still accruing	157		288		—		—		—		6		—		451
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	30		4,668		1,254		—		—		8		—		5,960
	$	1,636	$	5,026	$	3,371	$	—	$	—	$	81	$	—	$	10,114

The accrual of interest is discontinued on a loan when management believes after considering collection efforts and other factors that the borrower's financial condition is such that collection of interest is doubtful. All interest accrued but not collected for loans that are placed on nonaccrual status or charged-off is reversed against interest income. Cash collections on nonaccrual loans are generally credited to the loan receivable balance, and no interest income is recognized on those loans until the principal balance has been collected. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Impaired loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. The Company has identified these loans through its normal loan review procedures. Impaired loans are measured based on 1) the present value of expected future cash flows discounted at the loans effective interest rate; 2) the loan's observable market price; or 3) the fair value of collateral if the loan is collateral dependent. Substantially all of the Company’s impaired loans are measured at the fair value of the collateral. In limited cases, the Company may use the other methods to determine the level of impairment of a loan if such loan is not collateral dependent.

All commercial, real estate, agricultural loans and troubled debt restructurings are considered for individual impairment analysis. Smaller balance consumer loans are collectively evaluated for impairment.

15

Impaired loans by loan class at March 31, 2015 and December 31, 2014, are summarized as follows:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
March 31, 2015
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	$	5,865	$	1,441	$	—	$	—	$	—	$	—	$	—	$	7,306
Impaired loans with no allowance for loan losses	35		5,044		3,216		—		—		76		—		8,371
Total	$	5,900	$	6,485	$	3,216	$	—	$	—	$	76	$	—	$	15,677
Unpaid principal balance of impaired loans	$	5,904	$	6,990	$	3,375	$	—	$	—	$	95	$	—	$	16,364
Allowance for loan losses on impaired loans	$	1,120	$	64	$	—	$	—	$	—	$	—	$	—	$	1,184
December 31, 2014
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	$	1,475	$	2,056	$	13	$	—	$	—	$	7	$	—	$	3,551
Impaired loans with no allowance for loan losses	4		4,712		3,374		—		—		68		—		8,158
Total	$	1,479	$	6,768	$	3,387	$	—	$	—	$	75	$	—	$	11,709
Unpaid principal balance of impaired loans	$	1,482	$	7,274	$	3,605	$	—	$	—	$	93	$	—	$	12,454
Allowance for loan losses on impaired loans	$	339	$	124	$	8	$	—	$	—	$	4	$	—	$	475
For the three months ended March 31, 2015
Average recorded investment in impaired loans	$	3,689	$	6,627	$	3,302	$	—	$	—	$	76	$	—	$	13,694
Interest income recognized on impaired loans	$	21	$	93	$	29	$	—	$	—	$	—	$	—	$	143
For the three months ended March 31, 2014
Average recorded investment in impaired loans	$	376	$	7,788	$	3,207	$	85	$	—	$	63	$	—	$	11,519
Interest income recognized on impaired loans	$	3	$	107	$	28	$	—	$	—	$	—	$	—	$	138

Certain impaired loans have adequate collateral and do not require a related allowance for loan loss.

The Company will charge off that portion of any loan which management considers a loss. Commercial and real estate loans are generally considered for charge-off when exposure beyond collateral coverage is apparent and when no further collection of the loss portion is anticipated based on the borrower’s financial condition.

The restructuring of a loan is considered a “troubled debt restructuring” if both 1) the borrower is experiencing financial difficulties and 2) the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, principal forgiveness, extending amortization and other actions intended to minimize potential losses.

16

A “troubled debt restructured” loan is identified as impaired and measured for credit impairment as of each reporting period in accordance with the guidance in  Accounting Standards Codification (ASC) 310-10-35. The recorded investment in troubled debt restructurings, including those on nonaccrual, was $7,045 and $7,302 as of March 31, 2015 and December 31, 2014.

Following is a summary of loans modified under troubled debt restructurings during the three months ended March 31, 2015 and 2014:

.

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
Troubled debt restructurings during the three months ended March 31, 2015
Number of contracts	—		—		—		—		—		—		—		—
Pre-restructuring outstanding recorded investment	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Post-restructuring outstanding recorded investment	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Troubled debt restructurings during the three months ended March 31, 2014
Number of contracts	—		1		—		—		—		—		—		1
Pre-restructuring outstanding recorded investment	$	—	$	700	$	—	$	—	$	—	$	—	$	—	$	700
Post-restructuring outstanding recorded investment	$	—	$	700	$	—	$	—	$	—	$	—	$	—	$	700

At March 31, 2015 and 2014, there were no loans modified under troubled debt restructurings during the previous twelve month period that subsequently defaulted during the three months ended March 31, 2015 and 2014, respectively. At March 31, 2015 and 2014, the Company had no commitments to lend additional funds to any borrowers with loans whose terms have been modified under troubled debt restructurings.

Modifications primarily relate to extending the amortization periods of the loans and interest rate concessions. The majority of these loans were identified as impaired prior to restructuring; therefore, the modifications did not materially impact the Company’s determination of the allowance for loan losses.

17

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. The following table presents information regarding the aging of past due loans by loan class as of March 31, 2015 and December 31, 2014:

	Loans 30-89 Days Past Due		Loans 90 or More Past Due		Total Past Due Loans		Current Loans		Total Loans
March 31, 2015
Commercial	$	244	$	5,838	$	6,082	$	691,367	$	697,449
Commercial real estate, land and land  development	86		—		86		1,857,320		1,857,406
Residential real estate	1,087		404		1,491		514,225		515,716
Single-family interim construction	—		—		—		148,202		148,202
Agricultural	—		—		—		37,650		37,650
Consumer	1,363		11		1,374		46,013		47,387
Other	—		—		—		139		139
	$	2,780	$	6,253	$	9,033	$	3,294,916	$	3,303,949
December 31, 2014
Commercial	$	6,006	$	157	$	6,163	$	665,889	$	672,052
Commercial real estate, land and land  development	973		288		1,261		1,784,137		1,785,398
Residential real estate	1,258		554		1,812		512,213		514,025
Single-family interim construction	410		—		410		137,868		138,278
Agricultural	—		—		—		38,822		38,822
Consumer	1,899		8		1,907		50,360		52,267
Other	—		—		—		242		242
	$	10,546	$	1,007	$	11,553	$	3,189,531	$	3,201,084

The Company’s internal classified report is segregated into the following categories: 1) Pass/Watch, 2) Other Assets Especially Mentioned (OAEM), 3) Substandard and 4) Doubtful. The loans placed in the Pass/Watch category reflect the Company’s opinion that the loans reflect potential weakness that requires monitoring on a more frequent basis. The loans in the OAEM category reflect the Company’s opinion that the credit contains weaknesses which represent a greater degree of risk and warrant extra attention. These loans are reviewed monthly by officers and senior management to determine if a change in category is warranted. The loans placed in the Substandard category are considered to be potentially inadequately protected by the current debt service capacity of the borrower and/or the pledged collateral. These credits, even if apparently protected by collateral value, have shown weakness related to adverse financial, managerial, economic, market or political conditions, which may jeopardize repayment of principal and interest. There is possibility that some future loss could be sustained by the Company if such weakness is not corrected. The Doubtful category includes loans that are in default or principal exposure is probable. Substandard and Doubtful loans are individually evaluated to determine if they should be classified as impaired and an allowance is allocated if deemed necessary under ASC 310-10.

The loans that are not impaired are included with the remaining “pass” credits in determining the portion of the allowance for loan loss based on historical loss experience and other qualitative factors. The portfolio is segmented into categories including: commercial loans, consumer loans, commercial real estate loans, residential real estate loans and agricultural loans. The adjusted historical loss percentage is applied to each category. Each category is then added together to determine the allowance allocated under ASC 450-20.

18

A summary of loans by credit quality indicator by class as of March 31, 2015 and December 31, 2014, is as follows:

	Pass		Pass/ Watch		OAEM		Substandard		Doubtful		Total
March 31, 2015
Commercial	$	619,818	$	57,847	$	13,536	$	6,248	$	—	$	697,449
Commercial real estate, construction, land  and land development	1,832,284		8,626		5,962		10,534		—		1,857,406
Residential real estate	507,953		2,155		190		5,418		—		515,716
Single-family interim construction	148,202		—		—		—		—		148,202
Agricultural	37,595		55		—		—		—		37,650
Consumer	47,188		35		45		119		—		47,387
Other	139		—		—		—		—		139
	$	3,193,179	$	68,718	$	19,733	$	22,319	$	—	$	3,303,949
December 31, 2014
Commercial	$	647,894	$	16,919	$	977	$	6,262	$	—	$	672,052
Commercial real estate, construction, land  and land development	1,759,533		8,667		6,008		11,190		—		1,785,398
Residential real estate	505,920		2,188		325		5,592		—		514,025
Single-family interim construction	138,278		—		—		—		—		138,278
Agricultural	38,422		57		—		343		—		38,822
Consumer	52,055		39		50		123		—		52,267
Other	242		—		—		—		—		242
	$	3,142,344	$	27,870	$	7,360	$	23,510	$	—	$	3,201,084

The Company has acquired certain loans which experienced credit deterioration since origination (purchased credit impaired (PCI) loans). Accretion on PCI loans is based on estimated future cash flows, regardless of contractual maturity. There are no PCI loans outstanding for acquisitions prior to 2012. No additional PCI loans were acquired during the three months ended March 31, 2015.

The following table summarizes the outstanding balance and related carrying amount of purchased credit impaired loans by acquired bank as of the respective acquisition date for the acquisitions occurring in 2014:

	Acquisition Date
	October 1, 2014			April 15, 2014			January 1, 2014
	Houston City Bancshares, Inc.			BOH Holdings, Inc.			Live Oak Financial Corp.
Outstanding balance	$	12,021		$	55,718		$	3,583
Nonaccretable difference	(1,240		)	(5,798		)	(519		)
Accretable yield	(561		)	(2,579		)	(182		)
Carrying amount	$	10,220		$	47,341		$	2,882

The carrying amount of all acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at March 31, 2015 and December 31, 2014, were as follows:

	March 31, 2015		December 31, 2014
Outstanding balance	$	63,595	$	69,371
Carrying amount	54,837		59,697

There was no allocation established in the allowance for loan losses relating to PCI loans at March 31, 2015 or December 31, 2014.

19

The changes in accretable yield during the three months ended March 31, 2015 in regard to loans transferred at acquisition for which it was probable that all contractually required payments would not be collected are presented in the table below. Activity in accretable yield for the three months ended March 31, 2014 was not material.

	Three Months Ended March 31, 2015
Balance at January 1, 2015	$	2,546
Additions	—
Accretion	(184		)
Net transfers to/from nonaccretable	—
Balance at March 31, 2015	$	2,362

Note 5. Commitments and Contingencies

Financial Instruments with Off-Balance Sheet Risk

The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. The commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the balance sheet.

The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual amount of this instrument. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. At March 31, 2015 and December 31, 2014, the approximate amounts of these financial instruments were as follows:

	March 31,		December 31,
	2015		2014
Commitments to extend credit	$	566,165	$	565,881
Standby letters of credit	7,110		8,571
	$	573,275	$	574,452

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 expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained if deemed necessary by the Company upon extension of credit is based on management’s credit evaluation of the counterparty. Collateral held varies but may include accounts receivable, inventory, farm crops, property, plant and equipment and income-producing commercial properties.

Letters of credit are written conditional commitments used by the Company to guarantee the performance of a customer to a third party. The Company’s policies generally require that letter of credit arrangements contain security and debt covenants similar to those contained in loan arrangements. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount shown in the table above. If the commitment is funded, the Company would be entitled to seek recovery from the customer. As of March 31, 2015 and December 31, 2014, no amounts have been recorded as liabilities for the Company’s potential obligations under these guarantees.

Litigation

The Company is involved in certain legal actions arising from normal business activities. Management believes that the outcome of such proceedings will not materially affect the financial position, results of operations or cash flows of the Company.

20

Lease Commitments

The Company leases certain branch facilities and other facilities. Rent expense related to these leases amounted to $483 and $198 for the three months ended March 31, 2015 and 2014, respectively.

Other

In March 2015, the Company entered into a purchase agreement totaling $8,800 to purchase a new aircraft for the Company. Through March 31, 2015, the Company has made payments totaling $2,000 with the remaining $6,800 due at time of delivery of the aircraft, which is scheduled for September 2015. The Company is currently in negotiations to sell its current aircraft.

Note 6. Repurchase Agreements and Other Borrowings

At March 31, 2015 and December 31, 2014, repurchase agreements totaled $5,783 and $4,012, respectively. Securities held in safekeeping totaling $5,784 are pledged as security on these repurchase agreement accounts.

Other borrowings, including those borrowings due to related parties totaled $72,105 and $72,730 at March 31, 2015 and December 31, 2014, respectively. Scheduled principal payments of $625 were made on January 15, 2015 for subordinated debentures issued to individuals.

Note 7. Income Taxes

Income tax expense for the three months ended March 31, 2015 and 2014 was as follows:

	Three Months Ended March 31,
	2015			2014
Income tax expense for the period	$	4,536		$	2,339
Effective tax rate	32.4		%	32.8		%

The effective tax rates differ from the statutory federal tax rate of 35% largely due to tax exempt interest income earned on certain investment securities and loans and the nontaxable earnings on bank owned life insurance.

Note 8. Fair Value Measurements

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC Topic 820, Fair Value Measurements and Disclosures, establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:

Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means.

Level 3 Inputs – Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities.

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The following table represents assets reported on the consolidated balance sheets at their fair value on a recurring basis as of March 31, 2015 and December 31, 2014 by level within the ASC Topic 820 fair value measurement hierarchy:

			Fair Value Measurements at Reporting Date Using
	Assets/ Liabilities Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2015
Measured on a recurring basis:
Assets:
Investment securities available for sale:
U.S. treasuries	$	1,008	$	—	$	1,008	$	—
Government agency securities	54,289		—		54,289		—
Obligations of state and municipal subdivisions	75,407		—		75,407		—
Corporate bonds	1,098		—		1,098		—
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	66,347		—		66,347		—
December 31, 2014
Measured on a recurring basis:
Assets:
Investment securities available for sale:
U.S. treasuries	$	1,006	$	—	$	1,006	$	—
Government agency securities	58,023		—		58,023		—
Obligations of state and municipal subdivisions	76,899		—		76,899		—
Corporate bonds	1,081		—		1,081		—
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	69,053		—		69,053		—

There were no transfers between level categorizations and no changes in valuation methodologies for the periods presented.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.

Securities classified as available for sale are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury and other yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things.

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In accordance with ASC Topic 820, certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the assets and liabilities are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents the assets carried on the consolidated balance sheet by caption and by level in the fair value hierarchy at March 31, 2015 and December 31, 2014, for which a nonrecurring change in fair value has been recorded:

			Fair Value Measurements at Reporting Date Using
	Assets Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Period Ended Total (Gains) Losses
March 31, 2015
Measured on a nonrecurring basis:
Assets:
Impaired loans	$	4,203	$	—	$	—	$	4,203	$	709
Other real estate	—		—		—		—		$	—
December 31, 2014
Measured on a nonrecurring basis:
Assets:
Impaired loans	$	4,943	$	—	$	—	$	4,943	$	188
Other real estate	138		—		—		138		22

Impaired loans (loans which are not expected to repay all principal and interest amounts due in accordance with the original contractual terms) are measured at an observable market price (if available) or at the fair value of the loan’s collateral (if collateral dependent). Fair value of the loan’s collateral is determined by appraisals or independent valuation, which is then adjusted for the estimated costs related to liquidation of the collateral. Management’s ongoing review of appraisal information may result in additional discounts or adjustments to valuation based upon more recent market sales activity or more current appraisal information derived from properties of similar type and/or locale. Therefore, the Company has categorized its impaired loans as Level 3.

The Company has no nonfinancial assets or nonfinancial liabilities measured at fair value on a recurring basis. Other real estate is measured at fair value on a nonrecurring basis (upon initial recognition or subsequent impairment). Other real estate is classified within Level 3 of the valuation hierarchy. When transferred from the loan portfolio, other real estate is adjusted to fair value less estimated selling costs and is subsequently carried at the lower of carrying value or fair value less estimated selling costs. The fair value is determined using an external appraisal process, discounted based on internal criteria.

In addition, mortgage loans held for sale are required to be measured at the lower of cost or fair value. The fair value of mortgage loans held for sale is based upon binding quotes or bids from third party investors. As of March 31, 2015 and December 31, 2014, all mortgage loans held for sale were recorded at cost.

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The methods and assumptions used by the Company in estimating fair values of financial instruments as disclosed herein in accordance with ASC Topic 825, Financial Instruments, other than for those measured at fair value on a recurring and nonrecurring basis discussed above, are as follows:

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

Loans and loans held for sale: For variable-rate loans that reprice frequently and have no significant changes in credit risk, fair values are based on carrying values. Fair values for certain mortgage loans (for example, one-to-four family residential), commercial real estate and commercial loans are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality.

Federal Home Loan Bank of Dallas and other restricted stock: The carrying value of restricted securities such as stock in the Federal Home Loan Bank of Dallas and Independent Bankers Financial Corporation approximates fair value.

Deposits: The fair values disclosed for demand deposits are, by definition, equal to the amount payable on demand at the reporting date (that is their carrying amounts). The carrying amounts of variable-rate certificates of deposit (CDs) approximate their fair values at the reporting date. Fair values for fixed-rate CDs are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits.

Federal Home Loan Bank advances, line of credit and federal funds purchased: The fair value of advances maturing within 90 days approximates carrying value. Fair value of other advances is based on the Company’s current borrowing rate for similar arrangements.

Repurchase agreements and other borrowings: The carrying value of repurchase agreements approximates fair value due to the short term nature. The fair values of private subordinated debentures are based upon prevailing rates on similar debt in the market place. The subordinated notes that are publicly traded are valued based on indicative bid prices based upon market pricing observations in the current market.

Junior subordinated debentures: The fair value of junior subordinated debentures is estimated using discounted cash flow analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements.

Accrued interest: The carrying amounts of accrued interest approximate their fair values.

Off-balance sheet instruments: Fair values for off-balance sheet, credit-related financial instruments are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties' credit standing. The fair value of commitments is not material.

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The carrying amount, estimated fair value and the level of the fair value hierarchy of the Company’s financial instruments were as follows at March 31, 2015 and December 31, 2014:

					Fair Value Measurements at Reporting Date Using
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2015
Financial assets:
Cash and cash equivalents	$	358,798	$	358,798	$	358,798	$	—	$	—
Securities available for sale	198,149		198,149		—		198,149		—
Loans held for sale	7,034		7,034		—		7,034		—
Loans, net	3,283,021		3,302,768		—		3,296,646		6,122
FHLB of Dallas stock and other restricted stock	12,333		12,333		—		12,333		—
Accrued interest receivable	9,111		9,111		—		9,111		—
Financial liabilities:
Deposits	3,386,678		3,388,747		—		3,388,747		—
Accrued interest payable	1,823		1,823		—		1,823		—
FHLB advances	219,386		219,556		—		219,556		—
Repurchase agreements	5,783		5,783		—		5,783		—
Other borrowings	72,105		74,686		—		74,686		—
Junior subordinated debentures	18,147		18,137		—		18,137		—
Off-balance sheet assets (liabilities):
Commitments to extend credit	—		—		—		—		—
Standby letters of credit	—		—		—		—		—
December 31, 2014
Financial assets:
Cash and cash equivalents	$	324,047	$	324,047	$	324,047	$	—	$	—
Securities available for sale	206,062		206,062		—		206,062		—
Loans held for sale	4,453		4,453		—		4,453		—
Loans, net	3,182,045		3,203,337		—		3,200,261		3,076
FHLB of Dallas stock and other restricted stock	12,321		12,321		—		12,321		—
Accrued interest receivable	9,655		9,655		—		9,655		—
Financial liabilities:
Deposits	3,249,598		3,252,114		—		3,252,114		—
Accrued interest payable	2,919		2,919		—		2,919		—
FHLB advances	229,405		228,607		—		228,607		—
Repurchase agreements	4,012		4,012		—		4,012		—
Other borrowings	72,730		75,164		—		75,164		—
Junior subordinated debentures	18,147		18,134		—		18,134		—
Off-balance sheet assets (liabilities):
Commitments to extend credit	—		—		—		—		—
Standby letters of credit	—		—		—		—		—

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Note 9. Stock Awards and Stock Warrants

The Company grants common stock awards to certain employees of the Company. The common stock issued prior to 2013 vests five years from the date the award is granted and the related compensation expense is recognized over the vesting period. In connection with the initial public offering in April 2013, the Board of Directors adopted a new 2013 Equity Incentive Plan. Under this plan, the Compensation Committee may grant awards in the form of restricted stock, restricted stock rights, restricted stock units, qualified and nonqualified stock options, performance-based share awards and other equity-based awards. The Plan reserved 800,000 shares of common stock to be awarded by the Company’s compensation committee. The shares currently issued under the 2013 Plan are restricted and will vest evenly over the required employment period, generally ranging from three to five years. Shares granted under a previous plan prior to 2012 and those in and subsequent to 2013 under the 2013 Equity Incentive Plan were issued at the date of grant and receive dividends. Shares issued under a revised plan in 2012 are not outstanding shares of the Company until they vest and do not receive dividends.

The following table summarizes the activity in nonvested shares for the three months ended March 31, 2015 and 2014:

	Number of Shares		Weighted Average Grant Date Fair Value
Nonvested shares, December 31, 2014	373,886		$	41.58
Granted during the period	87,124		31.41
Vested during the period	(19,016	)	32.98
Nonvested shares, March 31, 2015	441,994		$	40.16
Nonvested shares, December 31, 2013	306,524		$	22.75
Granted during the period	27,183		50.80
Vested during the period	(92,000	)	17.92
Nonvested shares, March 31, 2014	241,707		$	27.75

Compensation expense related to these awards is recorded based on the fair value of the award at the date of grant and totaled $1,097 and $390 for the three months ended March 31, 2015 and 2014, respectively. Compensation expense is recorded in salaries and employee benefits in the accompanying consolidated statements of income. At March 31, 2015, future compensation expense is estimated to be $13,650 and will be recognized over a remaining weighted average period of 3.33 years.

The fair value of common stock awards that vested during the three months ended March 31, 2015 and 2014 was $678 and $4,869, respectively. The Company has recorded $3 and $1,022 to additional paid in capital, which represents the excess tax benefit recognized on the vested shares for the three months ended March 31, 2015 and 2014, respectively.

At March 31, 2015, the future vesting schedule of the nonvested shares is as follows:

First year	110,675
Second year	127,348
Third year	111,307
Fourth year	58,564
Fifth year	34,100
Total nonvested shares	441,994

The Company has warrants outstanding representing the right to purchase 150,544 shares of Company stock at $17.19 per share to certain Company directors and shareholders. The warrants were issued in return for the shareholders' agreement to repurchase the subordinated debt outstanding to an unaffiliated bank in the event of Company default. The subordinated debt was paid off by the Company in 2013. The warrants expire in December 2018.

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Note 10. Regulatory Matters

Under banking law, there are legal restrictions limiting the amount of dividends the Bank can declare. Approval of the regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of the Bank to fall below specified minimum levels. For state banks, subject to regulatory capital requirements, payment of dividends is generally allowed to the extent of net profits.

The Company (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by 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 guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of 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.

In July 2013, the Federal Reserve published final rules for the adoption of the Basel III regulatory capital framework (the "Basel III Capital Rules"). The Basel III Capital Rules, among other things, (i) introduce a new capital measure called "Common Equity Tier 1" ("CET1"), (ii) specify that Tier 1 capital consist of Common Equity Tier 1 and "Additional Tier 1 Capital" instruments meeting specified requirements, (iii) define Common Equity Tier 1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to Common Equity Tier 1 and not to the other components of capital and (iv) expand the scope of the deductions/adjustments as compared to existing regulations. The Basel III Capital Rules became effective for the Company on January 1, 2015 with certain transition provisions fully phased in on January 1, 2019.

Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total, CET1 and Tier 1 capital (as defined in the regulations) to risk weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). Management believes, as of March 31, 2015 and December 31, 2014, the Company and the Bank meet all capital adequacy requirements to which they are subject.

As of March 31, 2015 and December 31, 2014, the Bank’s capital ratios exceeded those levels necessary to be categorized as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized," the Bank must maintain minimum total risk based, CET1, Tier 1 risk based and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed the Bank’s category.

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The actual capital amounts and ratios of the Company and Bank as of March 31, 2015 and December 31, 2014, are presented in the following table:

	Actual				Minimum for Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
March 31, 2015
Total capital to risk weighted assets:
Consolidated	$	412,795	11.88	%	$	277,924	8.00	%	N/A		N/A
Bank	406,452		11.71		277,597		8.00		$	346,996	10.00	%
Tier 1 capital to risk weighted assets:
Consolidated	323,305		9.31		208,443		6.00		N/A		N/A
Bank	386,225		11.13		208,198		6.00		277,597		8.00	%
Common equity tier 1 to risk weighted assets
Consolidated	299,367		8.62		156,333		4.50		N/A		N/A
Bank	386,225		11.13		156,148		4.50		225,547		6.50	%
Tier 1 capital to average assets:
Consolidated	323,305		7.78		166,160		4.00		N/A		N/A
Bank	386,225		9.93		155,549		4.00		194,436		5.00	%
December 31, 2014
Total capital to risk weighted assets:
Consolidated	$	402,326	12.59	%	$	255,633	8.00	%	N/A		N/A
Bank	397,512		12.46		255,219		8.00		$	319,024	10.00	%
Tier 1 capital to risk weighted assets:
Consolidated	314,136		9.83		127,817		4.00		N/A		N/A
Bank	378,960		11.88		127,609		4.00		191,414		6.00	%
Tier 1 capital to average assets:
Consolidated	314,136		8.15		154,270		4.00		N/A		N/A
Bank	378,960		9.93		152,598		4.00		190,747		5.00	%

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Note 11. Business Combination

BOH Holdings

During the three months ended March 31, 2015, the Company made measurement-period adjustments to previously-reported acquisition accounting estimates for the April 15, 2014 acquisition of BOH Holdings. Additional termination accruals were identified that related to BOH accounts that existed prior to the acquisition and resulted in an increase of $182 to other liabilities and to goodwill.

Note 12. Subsequent Event

Declaration of Dividends

On May 1, 2015, the Company declared a quarterly cash dividend in the amount of $0.08 per share of common stock to the stockholders of record on May 15, 2015. The dividend will be paid on May 28, 2015.

Revised Capital Ratios

Subsequent to the Company’s issuance of its first quarter earnings release on April 27, 2015, the Company changed its calculation of risk weighted assets, which in turn affected the risk weighted capital ratios reported in the earnings release. After the issuance of the earnings release, the Company discovered that an incorrect credit conversion factor had been applied to certain unfunded commitments in calculating the amount of risk weighted assets. Due to this calculation error, risk weighted assets were overstated by approximately $112 million which resulted in the Company’s common equity tier 1 capital to risk weighted assets, tier 1 capital to risk weighted assets and total capital to risk-weighted assets ratios being understated in the earnings release by approximately 27, 29 and 37 basis points, respectively. The Company’s risk weighted capital ratios set forth in footnote 10 of the financial statements are based upon the corrected calculation and reflect an increase in the risk weighted capital ratios previously reported in the earnings release. The Company continues to be well capitalized under applicable regulations.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Cautionary Note Regarding Forward Looking Statements

This Quarterly Report on Form 10-Q, our other filings with the SEC, and other press releases, documents, reports and announcements that we make, issue or publish may contain statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are statements or projections with respect to matters such as our future results of operations, including our future revenues, income, expenses, provision for taxes, effective tax rate, earnings per share and cash flows, our future capital expenditures and dividends, our future financial condition and changes therein, including changes in our loan portfolio and allowance for loan losses, our future capital structure or changes therein, the plan and objectives of management for future operations, our future or proposed acquisitions, the future or expected effect of acquisitions on our operations, results of operations and financial condition, our future economic performance and the statements of the assumptions underlying any such statement. Such statements are typically identified by the use in the statements of words or phrases such as “aim,” “anticipate,” “estimate,” “expect,” “goal,” “guidance,” “intend,” “is anticipated,” “is estimated,” “is expected,” “is intended,” “objective,” “plan,” “projected,” “projection,” “will affect,” “will be,” “will continue,” “will decrease,” “will grow,” “will impact,” “will increase,” “will incur,” “will reduce,” “will remain,” “will result,” “would be,” variations of such words or phrases (including where the word “could”, “may” or “would” is used rather than the word “will” in a phrase) and similar words and phrases indicating that the statement addresses some future result, occurrence, plan or objective. The forward-looking statements that we make are based on the Company’s current expectations and assumptions regarding its business, the economy, and other future conditions. Because forward-looking statements relate to future results and occurrences, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. The Company’s actual results may differ materially from those contemplated by the forward-looking statements, which are neither statements of historical fact nor guarantees or assurances of future performance. Many possible events or factors could affect the future financial results and performance of the Company and could cause such results or performance to differ materially from those expressed in forward-looking statements. These factors include, but are not limited to, the following:

• worsening business and economic conditions nationally, regionally and in our target markets, particularly in Texas and the geographic areas in which we operate;

• our dependence on our management team and our ability to attract, motivate and retain qualified personnel;

• the concentration of our business within our geographic areas of operation in Texas;

• deteriorating asset quality and higher loan charge-offs;

• concentration of our loan portfolio in commercial and residential real estate loans and changes in the prices, values and sales volumes of commercial and residential real estate;

• inaccuracy of the assumptions and estimates we make in establishing reserves for probable loan losses and other estimates;

• lack of liquidity, including as a result of a reduction in the amount of sources of liquidity we currently have;

• material decreases in the amount of deposits we hold;

• regulatory requirements to maintain minimum capital levels;

• changes in market interest rates that affect the pricing of our loans and deposits and our net interest income;

• fluctuations in the market value and liquidity of the securities we hold for sale;

• effects of competition from a wide variety of local, regional, national and other providers of financial, investment and insurance services;

• changes in economic and market conditions that affect the amount of assets we have under administration;

• the institution and outcome of litigation and other legal proceeding against us or to which we become subject;

• the occurrence of market conditions adversely affecting the financial industry generally;

• the impact of recent and future legislative and regulatory changes, including changes in banking, securities and tax laws and regulations and their application by our regulators, such as the Dodd-Frank Wall Street Reform and Consumer Protection Act, or the Dodd-Frank Act;

• changes in accounting policies and practices, as may be adopted by the bank regulatory agencies, the Financial Accounting Standards Board, the SEC and Public Company Accounting Oversight Board:

• governmental monetary and fiscal policies;

• changes in the scope and cost of FDIC insurance and other coverage;

• the effects of war or other conflicts, acts of terrorism (including cyber attacks) or other catastrophic events, including storms, droughts, tornadoes and flooding, that may affect general economic conditions;

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• our actual cost savings resulting from the acquisitions of BOH Holdings, Houston City Bancshares and Live Oak Financial Corp. are less than expected, we are unable to realize those cost savings as soon as expected or we incur additional or unexpected costs;

• our revenues after the BOH Holdings, Inc., Houston City Bancshares and Live Oak Financial Corp. acquisitions are less than expected;

• deposit attrition, operating costs, customer loss and business disruption before and after our completed acquisitions, including, without limitation, difficulties in maintaining relationships with employees, may be greater than we expected;

• the risk that the businesses of the Company, and financial institutions that it has or will acquire, will not be integrated successfully, or such integrations may be more difficult, time-consuming or costly than expected;

• the quality of the assets acquired from other organizations being lower than determined in our due diligence investigation and related exposure to unrecoverable losses on loans acquired;

• general business and economic conditions in our markets change or are less favorable than expected;

• changes occur in business conditions and inflation;

• personal or commercial customers’ bankruptcies increase;

• technology-related changes are harder to make or are more expensive than expected; and

• the other factors that are described or referenced in Part II, Item 1A. of this Quarterly Report on Form 10-Q under the caption “Risk Factors.”

We urge you to consider all of these risks, uncertainties and other factors carefully in evaluating all such forward-looking statements we may make. As a result of these and other matters, including changes in facts, assumptions not being realized or other factors, the actual results relating to the subject matter of any forward-looking statement may differ materially from the anticipated results expressed or implied in that forward-looking statement. Any forward-looking statement made by the Company in any report, filing, press release, document, report or announcement speaks only as of the date on which it is made. The Company undertakes no obligation to update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by law.

A forward looking-statement may include a statement of the assumptions or bases underlying the forward-looking statement. The Company believes it has chosen these assumptions or bases in good faith and they are reasonable. However, the Company cautions you that assumptions or bases almost always vary from actual results, and the differences between assumptions or bases and actual results can be material. The Company undertakes no obligation to publicly update or otherwise revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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Overview

This Management’s Discussion and Analysis of Financial Condition and Results of Operations analyzes the major elements of the Company’s financial condition and results of operation as reflected in the interim consolidated financial statements and accompanying notes appearing in this Quarterly Report on Form 10-Q. This section should be read in conjunction with the Company’s interim consolidated financial statements and accompanying notes included elsewhere in this report and with the consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2014.

The Company was organized as a bank holding company in 2002. On January 1, 2009, the Company was merged with Independent Bank Group Central Texas, Inc., and, since that time, has pursued a strategy to create long-term shareholder value through organic growth of our community banking franchise in our market areas and through selective acquisitions of complementary banking institutions with operations in our market areas. On April 8, 2013, the Company consummated the initial public offering, or IPO, of its common stock which is traded on the NASDAQ Global Select Market.

The Company operates 40 full service banking locations, with 22 located in the Dallas/North Texas region, 7 located in the Austin/Central Texas region and 11 in the Houston region. The Company’s headquarters are located at 1600 Redbud, Suite 400, McKinney, Texas 75069, and its telephone number is (972) 562-9004. The Company’s website address is www.ibtx.com. Information contained on the Company’s website is not incorporated by reference into this Quarterly Report on Form 10-Q and is not part of this or any other report.

Our principal business is lending to and accepting deposits from businesses, professionals and individuals. We conduct all of our banking operations through Independent Bank, which is a Texas state banking corporation and our principal subsidiary (the Bank). We derive our income principally from interest earned on loans and, to a lesser extent, income from securities available for sale. We also derive income from non-interest sources, such as fees received in connection with various deposit services and mortgage brokerage operations. From time to time, we also realize gains on the sale of assets. Our principal expenses include interest expense on interest-bearing customer deposits, advances from the Federal Home Loan Bank of Dallas, or the FHLB, and other borrowings, operating expenses, such as salaries, employee benefits, occupancy costs, data processing and communication costs, expenses associated with other real estate owned, other administrative expenses, provisions for loan losses and our assessment for FDIC deposit insurance.

Certain Events Affect Year-over-Year Comparability

Acquisitions. During 2014, the Company completed three acquisitions. These acquisitions increased total assets, gross loans and deposits on the respective acquisition dates as detailed below.

	Acquisition Date	Total Assets	Gross Loans	Deposits
Live Oak Financial Corp.	January 1, 2014	131.0 million	71.3 million	105.0 million
BOH Holdings	April 15, 2014	1.2 billion	785.2 million	820.8 million
Houston Community Bancshares, Inc.	October 1, 2014	350.7 million	194.9 million	303.1 million

The comparability of the Company's results of operations for the three months ended March 31, 2015 and 2014 are affected by these acquisitions.

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Discussion and Analysis of Results of Operations for the Three Months Ended March 31, 2015 and 2014

The following discussion and analysis of our results of operations compares our results of operations for the three months ended March 31, 2015 with the three months ended March 31, 2014. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results of operations that may be expected for all of the year ending December 31, 2015.

Results of Operations

For the three months ended March 31, 2015, net income available to common shareholders was $9.4 million ($0.55 per common share on a diluted basis) compared with $4.8 million ($0.38 per common share on a diluted basis) for the three months ended March 31, 2014. The Company posted annualized returns on average common equity of 7.31% and 7.90%, returns on average assets of 0.92% and 0.84% and efficiency ratios of 60.90% and 65.70% for the three months ended March 31, 2015 and 2014, respectively. The efficiency ratio is calculated by dividing total noninterest expense (which does not include the provision for loan losses) by net interest income plus noninterest income.

Net Interest Income

The Company’s net interest income is its interest income, net of interest expenses. Changes in the balances of the Company’s earning assets and its deposits, FHLB advances and other borrowings, as well as changes in the market interest rates, affect the Company’s net interest income. The difference between the Company’s average yield on earning assets and its average rate paid for interest-bearing liabilities is its net interest spread. Noninterest-bearing sources of funds, such as demand deposits and stockholders’ equity, also support the Company’s earning assets. The impact of the noninterest-bearing sources of funds is reflected in the Company’s net interest margin, which is calculated as annualized net interest income divided by average earning assets.

Net interest income was $36.1 million for the three months ended March 31, 2015, an increase of $13.9 million, or 63.0%, from $22.1 million at March 31, 2014. This increase is due primarily to a $1.4 billion increase, or 67.3%, in average interest earning assets to $3.6 billion for the three months ended March 31, 2015 compared to $2.2 billion for the three months ended March 31, 2014. The greatest part of the increases in interest-earning assets and interest-bearing deposits occurred as a result of the acquisitions the Company completed in April and October 2014 but was also due in part to organic loan and deposit growth. The net interest margin for the three months ended March 31, 2015 decreased 10 basis points to 4.07% compared to 4.17% for the three months ended March 31, 2014. The decrease from the prior year is due to interest expense on subordinated debt issued in July 2014 (10 basis point effect on net interest margin for the quarter) and a decrease in loan yields of 40 basis points from the prior year. The average yield on interest earning assets decreased 15 basis points from 4.74% to 4.59%. The effect of this decrease was partially offset by a decrease in the average rate paid on interest bearing liabilities of 3 basis points from 0.71% to 0.68%. This change was due to a decrease in the cost of deposits partially offset by the increase in other borrowings due to the new issuance of the subordinated debt.

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Average Balance Sheet Amounts, Interest Earned and Yield Analysis.  The following table presents average balance sheet information, interest income, interest expense and the corresponding average yields earned and rates paid for the three months ended March 31, 2015 and 2014. The average balances are principally daily averages and, for loans, include both performing and nonperforming balances.

	For The Three Months Ended March 31,
	2015						2014
	Average Outstanding Balance		Interest		Yield/ Rate (3)		Average Outstanding Balance		Interest		Yield/ Rate (3)
(dollars in thousands)
Interest-earning assets:
Loans (1)	$	3,254,038	$	39,580	4.93	%	$	1,835,154	$	24,123	5.33	%
Taxable securities	134,015		609		1.84		174,880		699		1.62
Nontaxable securities	69,245		414		2.42		32,282		257		3.23
Federal funds sold and other	141,968		133		0.38		108,676		83		0.31
Total interest-earning assets	3,599,266		$	40,736	4.59		2,150,992		$	25,162	4.74
Noninterest-earning assets	554,741						179,940
Total assets	$	4,154,007					$	2,330,932
Interest-bearing liabilities:
Checking accounts	$	1,267,242	$	1,358	0.43		$	814,583	$	998	0.50
Savings accounts	143,754		65		0.18		122,038		88		0.29
Money market accounts	236,589		100		0.17		91,836		56		0.25
Certificates of deposit	818,773		1,186		0.59		487,408		765		0.64
Total deposits	2,466,358		2,709		0.45		1,515,865		1,907		0.51
FHLB advances	219,842		752		1.39		178,375		852		1.94
Notes payable, repurchase agreements and other borrowings	76,951		1,069		5.63		11,773		135		4.65
Junior subordinated debentures	18,147		128		2.86		18,147		133		2.97
Total interest-bearing liabilities	2,781,298		4,658		0.68		1,724,160		3,027		0.71
Noninterest-bearing checking accounts	819,330						350,136
Noninterest-bearing liabilities	8,542						10,229
Stockholders’ equity	544,837						246,407
Total liabilities and equity	$	4,154,007					$	2,330,932
Net interest income			$36,078						$	22,135
Interest rate spread					3.91	%					4.03	%
Net interest margin (2)					4.07						4.17
Average interest earning assets to interest bearing liabilities					129.41						124.76

(1) Average loan balances include nonaccrual loans.

(2) Net interest margins for the periods presented represent: (i) the difference between interest income on interest-earning assets and the interest expense on interest-bearing liabilities, divided by (ii) average interest-earning assets for the period.

(3) Yield and rates for the three-month periods are annualized.

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Provision for Loan Losses

Management actively monitors the Company’s asset quality and provides specific loss provisions when necessary. Provisions for loan losses are charged to income to bring the total allowance for loan losses to a level deemed appropriate by management based on such factors as historical loss experience, trends in classified loans and past dues, the volume and growth in the loan portfolio, current economic conditions and the value of collateral.

Loans are charged off against the allowance for loan losses when determined appropriate. Although management believes it uses the best information available to make determinations with respect to the provision for loan losses, future adjustments may be necessary if economic conditions differ from the assumptions used in making the determination.

The Company made a $1.7 million provision for loan losses for the three months ended March 31, 2015 compared to $1.3 million for the comparable period in 2014. The increase in the provision was primarily related to organic loan growth and the establishment of a $719 specific reserve on an impaired energy loan. The increase for the specific reserve was offset by less charge offs than in the prior year period. The Company was in a net recovery position of $5 thousand for the three months ended March, 31, 2015 compared to a net chargeoff position of $372 thousand for the three months ended March 31, 2014. The higher level of chargeoffs for 2014 primarily relate to three commercial loan chargeoffs totaling $345 thousand while there were no significant chargeoffs or recoveries for the 2015 period.

Noninterest Income

The following table sets forth the components of noninterest income for the three months ended March 31, 2015 and 2014 and the period-over-period variations in such categories of noninterest income:

	For the Three Months Ended March 31,				Variance
(dollars in thousands)	2015		2014		2015 v. 2014
Noninterest Income
Service charges on deposit accounts	$	1,805	$	1,211	$	594
Mortgage fee income	1,300		730		570
Gain on sale of other real estate	130		39		91
Increase in cash surrender value of bank owned life insurance	270		149		121
All other noninterest income	461		205		256
Total noninterest income	$	3,966	$	2,334	$	1,632

Total noninterest income increased $1.6 million, or 69.9% for the three months ended March 31, 2015, respectively compared to the same period in 2014. Significant changes in the components of noninterest income are discussed below.

Service charges on deposit accounts. Service charges on deposit accounts increased $594 thousand, or 49.1% for the three months ended March 31, 2015, respectively as compared to the same period in 2014. The increase in service charge income is due to an increase in deposit accounts due primarily to the three acquisitions closed in January, April and October 2014.

Mortgage fee income.  Mortgage fee income for the three months ended March 31, 2015 increased $570.0 thousand, or 78.1% compared to the same period in 2014. This increase is due to drop in mortgage rates during the quarter which prompted refinancing as well as increased volume of this product in our Austin and Houston branches.

Increase in cash surrender value of bank owned life insurance. Increase in earnings on bank owned life insurance increased $121 thousand, or 81.2% for the three months ended March 31, 2015 compared to the same period in 2014. The increase in earnings is due to insurance policies acquired in the BOH Holdings acquisition.

Other noninterest income. Other noninterest income for the three months ended March 31, 2015 increased $256 thousand, or 124.9% compared to the same period in 2014. The increase is primarily related to fees recognized by the wealth management group which was established in 2014 and minor increases in income due to the acquisitions completed in April and October 2014.

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Noninterest Expense

Noninterest expense increased $8.3 million, or 51.7% for the three months ended March 31, 2015 as compared to the same period in 2014. The overall increase from 2014 to 2015 is primarily due to increases in salaries and benefits expenses, occupancy expenses and other noninterest expenses related to completed acquisitions in April and October 2014. The following table sets forth the components of the Company’s noninterest expense for the three months ended March 31, 2015 and 2014 and the period-over-period variations in such categories of noninterest expense:

	For the Three Months Ended March 31,				Variance
(dollars in thousands)	2015		2014		2015 v. 2014
Noninterest Expense
Salaries and employee benefits	$	14,424	$	9,134	$	5,290
Occupancy	3,910		2,538		1,372
Data processing	688		496		192
FDIC assessment	519		304		215
Advertising and public relations	346		234		112
Communications	539		320		219
Other real estate owned expense, net	59		79		(20		)
Net expenses of operations of IBG Adriatica	—		23		(23		)
Core deposit intangible amortization	372		199		173
Professional fees	490		368		122
Acquisition expense, including legal	472		476		(4		)
Other	2,567		1,905		662
Total noninterest expense	$	24,386	$	16,076	$	8,310

Salaries and Employee Benefits.  Salaries and employee benefits expense, which historically has been the largest component of the Company’s noninterest expense, increased $5.3 million, or 57.9% for the three months ended March 31, 2015, compared to the same period in 2014. The increase was primarily attributable to an increase in the number of the Company’s full-time equivalent employees, which resulted from the two acquisitions the Company completed in April 2014 and October 2014 as well as the addition of new lending personnel in our growth markets. In addition, the expense related to amortization of stock awards has increased from $390 in the first quarter of 2014 to $1,097 in the first quarter of 2015 due to restricted stock granted to Bank of Houston and Houston Community bank executives in connection with employment agreements entered into in connection with the acquisitions as well as restricted stock granted to employees for annual bonuses in 2015.

Occupancy Expense.  Occupancy expense increased $1.4 million, or 54.1% for the three months ended March 31, 2015, compared to the same period in 2014. The increase for the period resulted from higher maintenance contract expense, building lease expenses and property taxes, attributable primarily to the acquisitions completed in April and October 2014. Six branches were added as a result of these acquisitions.

Data Processing. Data processing fees increased $192 thousand, or 38.7% for the three months ended March 31, 2015, compared to the same period in 2014. The change is due to increased online banking fees and other costs related directly to an increase in accounts over the same period prior year, related both to organic growth and growth through acquisitions.

FDIC Assessment. FDIC assessment expense increased $215 thousand, or 70.7% for the three months ended March 31, 2015, compared to the same period in 2014. The increase in both periods is due to a higher assessment associated with an increase in deposit accounts, both due to organic growth and growth through acquisitions.

Advertising and Public Relations. Advertising and public relations expense increased $112 thousand, or 47.9% for the three months ended March 31, 2015 as compared to the same period in 2014. The increase is due to the Company's entrance into the Houston market in 2014.

Communications. Communications expense increased $219 thousand, or 68.4% for the three months ended March 31, 2015 as compared to the same period in 2014. The change was due to increased telephone and data line expenses related to the acquisition activity in 2014 as the Company added six additional branches since the prior year.

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Core Deposit Intangible Amortization. Amortization expense on core deposit intangibles increased $173 thousand for the three months ended March 31, 2015 over the same period in 2014. The increase is due primarily to core deposit intangibles acquired in the acquisitions occurring in 2014. Core deposit intangibles are being amortized on the straight line method over 10 years.

Professional Fees. Professional fees increased $122 thousand, or 33.2% for the three months ended March 31, 2015 over the same period in 2014. The increase is due to increased audit fees and consulting fees for energy lending and IT related projects.

Other.  Other expense increased by $662 thousand, or 34.8% for the three months ended March 31, 2015, compared to the same period in 2014. The majority of the increases relate to general increases in various operations expenses, including deposit-related expense due to acquisition activity occurring in April and October 2014.

Income Tax Expense

Income tax expense was $4.5 million and $2.3 million for the three months ended March 31, 2015 and 2014, respectively which is an effective tax rate of 32.4% and 32.8%, respectively.

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Discussion and Analysis of Financial Condition

The following discussion and analysis of the Company’s financial condition discusses and analyzes the financial condition of the Company as of March 31, 2015 and December 31, 2014.

Assets

The Company’s total assets increased by $125.7 million, or 3.0%, to $4.3 billion as of March 31, 2015, from $4.1 billion at December 31, 2014.

Loan Portfolio

The following table presents the balance and associated percentage of each major category in our loan portfolio as of March 31, 2015 and December 31, 2014:

(dollars in thousands)	March 31, 2015					December 31, 2014
Commercial	$	697,449		21.1	%	$	672,052		21.0	%
Real estate:
Commercial	1,555,462			47.0		1,450,434			45.2
Commercial construction, land and land development	301,944			9.1		334,964			10.5
Residential (1)	522,750			15.8		518,478			16.2
Single family interim construction	148,202			4.5		138,278			4.3
Agricultural	37,650			1.1		38,822			1.2
Consumer	47,387			1.4		52,267			1.6
Other	139			—		242			—
	3,310,983			100.0	%	3,205,537			100.0	%
Deferred loan fees	(701		)			(487		)
Allowance for loan losses	(20,227		)			(18,552		)
Total loans, net	$	3,290,055				$	3,186,498

⁽¹⁾ Includes mortgage loans held for sale as of March 31, 2015 and December 31, 2014 of $7.0 million and $4.5 million, respectively.

Our loan portfolio is the largest category of our earning assets. As of March 31, 2015 and December 31, 2014, loans, net of allowance for loan losses, totaled $3.290 billion and $3.186 billion, respectively, which is an increase of 3.2% between the two dates.

Asset Quality

Nonperforming Assets. The Company has established procedures to assist the Company in maintaining the overall quality of the Company’s loan portfolio. In addition, the Company has adopted underwriting guidelines to be followed by the Company’s lending officers and which require significant senior management review of proposed extensions of credit exceeding certain thresholds. When delinquencies exist, the Company rigorously monitors the levels of such delinquencies for any negative or adverse trends. The Company’s loan review procedures include approval of lending policies and underwriting guidelines by Independent Bank’s board of directors, an annual independent loan review, approval of large credit relationships by Independent Bank’s Executive Loan Committee and loan quality documentation procedures. The Company, like other financial institutions, is subject to the risk that its loan portfolio will be subject to increasing pressures from deteriorating borrower credit due to general economic conditions.

The Company discontinues accruing interest on a loan when management of the Company believes, after considering the Company’s collection efforts and other factors, that the borrower’s financial condition is such that collection of interest of that loan is doubtful. Loans are placed on nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful. All interest accrued but not collected for loans, including troubled debt restructurings, that are placed on nonaccrual status or charged off is reversed against interest income. The interest on these loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

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Real estate we have acquired as a result of foreclosure or by deed-in-lieu-of foreclosure is classified as other real estate owned until sold.  The Bank’s policy is to initially record other real estate at fair value less estimated costs to sell at the date of foreclosure.  After foreclosure, other real estate is carried at the lower of the initial carrying amount (fair value less estimated costs to sell or lease), or at the value determined by subsequent appraisals of other real estate.

The Company periodically modifies loans to extend the term or make other concessions to help a borrower with a deteriorating financial condition stay current on their loan and to avoid foreclosure. The Company generally does not forgive principal or interest on loans or modify the interest rates on loans to rates that are below market rates. Under applicable accounting standards, such loan modifications are generally classified as troubled debt restructurings.

The following table sets forth the allocation of the Company’s nonperforming assets among the Company’s different asset categories as of the dates indicated. The Company classifies nonperforming loans as nonaccrual loans, loans past due 90 days or more and still accruing interest or loans modified under restructurings as a result of the borrower experiencing financial difficulties. The balances of nonperforming loans reflect the net investment in these assets, including deductions for purchase discounts.

(dollars in thousands)	March 31, 2015			December 31, 2014
Nonaccrual loans
Commercial	$	5,873		$	1,449
Real estate:
Commercial real estate, construction, land and land development	57			70
Residential real estate	631			2,117
Consumer	71			67
Total nonaccrual loans (1)	6,632			3,703
Loans delinquent 90 days or more and still accruing
Commercial	—			157
Real estate:
Residential real estate	—			288
Consumer	—			6
Total loans delinquent 90 days or more and still accruing	—			451
Troubled debt restructurings, not included in nonaccrual loans
Commercial	27			30
Real estate:
Commercial real estate, construction, land and land development	4,426			4,668
Residential real estate	2,571			1,254
Consumer	5			8
Total troubled debt restructurings, not included in nonaccrual loans	7,029			5,960
Total nonperforming loans	13,661			10,114
Other real estate owned (Bank only):
Commercial real estate, construction, land and land development	4,587			4,763
Total other real estate owned	4,587			4,763
Total nonperforming assets	$	18,248		$	14,877
Ratio of nonperforming loans to total loans	0.41		%	0.32		%
Ratio of nonperforming assets to total assets	0.43			0.36

⁽¹⁾   Nonaccrual loans include troubled debt restructurings of $16 thousand and $1.3 million as of March 31, 2015 and December 31, 2014, respectively.

Nonaccrual loans increased to $6.6 million at March 31, 2015 from $3.7 million as of December 31, 2014. The increase in nonaccruals is primarily due to one energy loan totaling $4.3 million that was added to nonaccrual in the first quarter. This was offset by one residential real estate loan totaling $1.3 million that was removed from nonaccrual status due to continued payment performance. Troubled debt restructurings that were also on nonaccrual status totaled $16 thousand and $1.3 million at March 31, 2015 and December 31, 2014, respectively. The decrease in this trend was due to the same residential real estate loan discussed above that was removed from nonaccrual status during the three months ended March 31, 2015. However, this loan continues to be classified as a troubled debt restructuring, and accounts for the majority of the increase in troubled debt restructings not on nonaccrual status for the period from December 31, 2014 to March 31, 2015.

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As of March 31, 2015, the Company had a total of 57 substandard loans with an aggregate principal balance of $11.9 million that were not currently nonaccrual loans, 90 days past due loans or troubled debt restructurings, but where the Company had information about possible credit problems of the borrowers that caused the Company’s management to have serious concerns as to the ability of the borrowers to comply with present loan repayment terms and that could result in those loans becoming nonaccrual loans, 90 days past due loans or troubled debt restructurings in the future.

The Company generally continues to use the classification of acquired loans classified nonaccrual or 90 days and accruing as of the acquisition date. The Company does not classify acquired loans as troubled debt restructurings, or TDRs, unless the Company modifies an acquired loan subsequent to acquisition that meets the TDR criteria. Reported delinquency of the Company’s purchased loan portfolio is based upon the contractual terms of the loans.

Allowance for Loan Losses. The allowance for loan losses is established through charges to earnings in the form of a provision for loan losses. The Company’s allowance for loan losses represents the Company’s estimate of probable and reasonably estimable loan losses inherent in loans held for investment as of the respective balance sheet date. The Company’s methodology for assessing the adequacy of the allowance for loan losses includes a general allowance for performing loans, which are grouped based on similar characteristics, and an allocated allowance for individual impaired loans. Actual credit losses or recoveries are charged or credited directly to the allowance. As of March 31, 2015, the allowance for loan losses amounted to $20.2 million, or 0.61% of total loans, compared with $18.6 million, or 0.58% of total loans as of December 31, 2014. The increase in this ratio is primarily due to a specific reserve being allocated to one energy loan during the first quarter 2015.

The allowance for loan losses to nonperforming loans has decreased from 183.43% at December 31, 2014 to 148.06% at March 31, 2015 due to an increase in nonperforming loans. Nonperforming loans have increased to $13.7 million at March 31, 2015 compared to $10.1 million at December 31, 2014 primarily due to the $4.3 million previously classified energy loan that was placed on nonaccrual status during the first quarter.

Securities Available for Sale

The Company’s investment strategy aims to maximize earnings while maintaining liquidity in securities with minimal credit, interest rate and duration risk. The types and maturities of securities purchased are primarily based on the Company’s current and projected liquidity and interest rate sensitivity positions.

The Company had no sales of securities during the three months ended March 31, 2015 and 2014. Securities represented 4.7% and 5.0% of the Company’s total assets at March 31, 2015 and December 31, 2014, respectively.

Management evaluates securities for other-than-temporary impairment (OTTI) on at least a quarterly basis and more frequently when economic of market conditions warrant such an evaluation. Management does not intend to sell any debt securities it holds and believes the Company more likely than not will not be required to sell any debt securities it holds before their anticipated recovery, at which time the Company will receive full value for the securities. Management has the ability and intent to hold the securities classified as available for sale that were in a loss position as of March 31, 2015 for a period of time sufficient for an entire recovery of the cost basis of the securities. For those securities that are impaired, the unrealized losses are largely due to interest rate changes. The fair value is expected to recover as the securities approach their maturity date. Management believes any impairment in the Company’s securities at March 31, 2015 is temporary and no impairment has been realized in the Company’s consolidated financial statements.

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Capital Resources and Regulatory Capital Requirements

Total stockholder’s equity was $550.7 million at March 31, 2015 compared with $540.9 million at December 31, 2014, an increase of approximately $9.9 million. The increase was due primarily to stock awards amortization of $1.1 million, an increase of $898 thousand in unrealized gain (loss) on available for sale securities and net income of $9.5 million earned by the Company for the three months ended March 31, 2015, offset by dividends paid of $1.4 million and offering costs related to an acquired bank of $144 thousand.

Banking regulators measure capital adequacy by means of the risk-based capital ratio and leverage ratio.  As disclosed in the Company's Form 10-K, in July 2013, the Federal Reserve Board and the FDIC issued final rules implementing the Basel III regulatory capital framework and related Dodd-Frank Wall Street Reform and Consumer Protection Act changes. The rules revise minimum capital requirements and adjust prompt corrective action thresholds. The final rules revise the regulatory capital elements, add a new common equity Tier I capital ratio, increase the minimum Tier 1 capital ratio requirements and implement a new capital conservation buffer. The rules also permit certain banking organizations to retain, through a one-time election, the existing treatment for accumulated other comprehensive income. The Company has made the election to retain the existing treatment for accumulated other comprehensive income. The final rules took effect for the Company on January 1, 2015, subject to a transition period for certain parts of the rules.

The risk based capital rules provide for the weighting of assets and off-balance-sheet commitments and contingencies according to prescribed risk categories ranging from 0% to 400%.  Regulatory capital is then divided by risk weighted assets to determine the risk adjusted capital ratios.  The leverage ratio is computed by dividing shareholders’ equity less intangible assets by quarter-to-date average assets less intangible assets. The final rules also include changes for the calculation of risk weighted assets. The amount of risk weighted assets increased during first quarter 2015 due in part to an increase in the required risk weighting of unfunded commitments with terms of less than one year that previously were weighted at 0% and now range from 20% to 50%.

As of March 31, 2015, the Company exceeded all capital ratio requirements under prompt corrective action and other regulatory requirements, as detailed in the table below:

	As of March 31, 2015
	Actual		Required to be considered well capitalized	Required to be considered adequately capitalized
	Ratio		Ratio	Ratio
Tier 1 capital to average assets ratio	7.78	%	≥5.00%	4.00-5.00%
Common equity tier 1 capital to risk-weighted assets ratio	8.35		≥6.50	4.50-6.50
Tier 1 capital to risk-weighted assets ratio	9.02		≥8.00	6.00-8.00
Total capital to risk-weighted assets ratio	11.51		≥10.00	8.00-10.00

Liquidity Management

The Company continuously monitors the Company’s liquidity position to ensure that assets and liabilities are managed in a manner that will meet all of the Company’s short-term and long-term cash requirements. The Company manages the Company’s liquidity position to meet the daily cash flow needs of customers, while maintaining an appropriate balance between assets and liabilities to meet the return on investment objectives of the Company’s shareholders. The Company also monitors its liquidity requirements in light of interest rate trends, changes in the economy, and the scheduled maturity and interest rate sensitivity of the investment and loan portfolios and deposits.

Liquidity risk management is an important element in the Company’s asset/liability management process. The Company’s short-term and long-term liquidity requirements are primarily to fund on-going operations, including payment of interest on deposits and debt, extensions of credit to borrowers, capital expenditures and shareholder dividends. These liquidity requirements are met primarily through cash flow from operations, redeployment of pre-paid and maturing balances in the Company’s loan and investment portfolios, debt financing and increases in customer deposits. The Company’s liquidity position is supported by management of liquid assets and liabilities and access to alternative sources of funds. Liquid assets

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include cash, interest-bearing deposits in banks, federal funds sold, securities available for sale and maturing or prepaying balances in the Company’s investment and loan portfolios. Liquid liabilities include core deposits, brokered deposits, federal funds purchased, securities sold under repurchase agreements and other borrowings. Other sources of liquidity include the sale of loans, the ability to acquire additional national market non core deposits, the issuance of additional collateralized borrowings such as FHLB advances, the issuance of debt securities, borrowings through the Federal Reserve’s discount window and the issuance of equity securities. For additional information regarding the Company’s operating, investing and financing cash flows, see the Consolidated Statements of Cash Flows provided in the Company’s consolidated financial statements.

In addition to the liquidity provided by the sources described above, Independent Bank maintains correspondent relationships with other banks in order to sell loans or purchase overnight funds should additional liquidity be needed. As of March 31, 2015 the Bank had established federal funds lines of credit with five unaffiliated banks totaling $125.0 million with no amounts advanced against those lines at that time. In addition, the Company had an unsecured line of credit totaling $35.0 million at an unaffiliated commercial bank. Based on the values of stock, securities, and loans pledged as collateral, as of March 31, 2015, the Company had additional borrowing capacity with the FHLB of $762.7 million.

Contractual Obligations

In the ordinary course of the Company’s operations, the Company enters into certain contractual obligations, such as obligations for operating leases and other arrangements with respect to deposit liabilities, FHLB advances and other borrowed funds. The Company believes that it will be able to meet its contractual obligations as they come due through the maintenance of adequate cash levels. The Company expects to maintain adequate cash levels through profitability, loan and securities repayment and maturity activity and continued deposit gathering activities. The Company has in place various borrowing mechanisms for both short-term and long-term liquidity needs.

In March 2015, as noted in footnote 5 of the consolidated financial statements, the Company entered into a purchase agreement totaling $8.8 million to purchase an aircraft for Company use. Other than that purchase agreement and normal changes in the ordinary course of business, there have been no significant changes in the types of contractual obligations or amounts due since December 31, 2014.

Off-Balance Sheet Arrangements

In the normal course of business, the Company enters into various transactions, which, in accordance with accounting principles generally accepted in the United States, are not included in the Company’s consolidated balance sheets. However, the Company has only limited off-balance sheet arrangements that have, or are reasonably likely to have, a current or future material effect on the Company’s financial condition, revenues, expenses, results of operations, liquidity, capital expenditures or capital resources. Independent Bank enters into these transactions to meet the financing needs of the Company’s customers. These transactions include commitments to extend credit and issue standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets.

Commitments to Extend Credit. Independent Bank enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Substantially all of Independent Bank’s commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of loan funding. Independent Bank minimizes its exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures.

Standby Letters of Credit. Standby letters of credit are written conditional commitments that Independent Bank issues to guarantee the performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of the agreement with the third party, Independent Bank would be required to fund the commitment. The maximum potential amount of future payments Independent Bank could be required to make is represented by the contractual amount of the commitment. If the commitment is funded, the customer is obligated to reimburse Independent Bank for the amount paid under this standby letter of credit.

Independent Bank’s commitments to extend credit and outstanding standby letters of credit were $566.2 million and $7.1 million, respectively, as of March 31, 2015. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements. The Company manages the Company’s liquidity in light of the aggregate amounts of commitments to extend credit and outstanding standby letters of credit in effect from time to time to ensure that the Company will have adequate sources of liquidity to fund such commitments and honor drafts under such letters of credit.

42

Critical Accounting Policies and Estimates

The preparation of the Company’s consolidated financial statements in accordance with U.S. generally accepted accounting principles, or GAAP, requires the Company to make estimates and judgments that affect the Company’s reported amounts of assets, liabilities, income and expenses and related disclosure of contingent assets and liabilities. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under current circumstances, results of which form the basis for making judgments about the carrying value of certain assets and liabilities that are not readily available from other sources. The Company evaluates the Company’s estimates on an ongoing basis. Actual results may differ from these estimates under different assumptions or conditions.

Accounting policies, as described in detail in the notes to the Company’s consolidated financial statements, are an integral part of the Company’s financial statements. A thorough understanding of these accounting policies is essential when reviewing the Company’s reported results of operations and the Company’s financial position. The Company believes that the critical accounting policies and estimates discussed below require the Company to make difficult, subjective or complex judgments about matters that are inherently uncertain. Changes in these estimates, that are likely to occur from period to period, or the use of different estimates that the Company could have reasonably used in the current period, would have a material impact on the Company’s financial position, results of operations or liquidity.

Acquired Loans. The Company’s accounting policies require that the Company evaluates all acquired loans for evidence of deterioration in credit quality since origination and to evaluate whether it is probable that the Company will collect all contractually required payments from the borrower.

Acquired loans from the transactions accounted for as a business combination include both loans with evidence of credit deterioration since their origination date and performing loans. The Company accounts for performing loans under ASC Paragraph 310-20, Nonrefundable Fees and Other Costs, with the related discount being adjusted for over the life of the loan and recognized as interest income. The Company accounts for the loans acquired in accordance with ASC Paragraph 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. At the date of the acquisition, acquired loans are recorded at their fair value.

The Company recognizes the difference between the undiscounted cash flows the Company expects (at the time the Company acquires the loan) to be collected and the investment in the loan, or the “accretable yield,” as interest income using the interest method over the life of the loan. The Company does not recognize contractually required payments for interest and principal that exceed undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” as a yield adjustment, loss accrual or valuation allowance. Increases in the expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over the loan’s remaining life, while decreases in expected cash flows are recognized as impairment. Valuation allowances on these impaired loans reflect only losses incurred after the acquisition.

Upon an acquisition, the Company generally continues to use the classification of acquired loans classified nonaccrual or 90 days and accruing. The Company does not classify acquired loans as TDRs unless the Company modifies an acquired loan subsequent to acquisition that meets the TDR criteria. Reported delinquency of the Company’s purchased loan portfolio is based upon the contractual terms of the loans.

Allowance for Loan Losses. The allowance for loan losses represents management’s estimate of probable and reasonably estimable credit losses inherent in the loan portfolio. In determining the allowance, the Company estimates losses on individual impaired loans, or groups of loans which are not impaired, where the probable loss can be identified and reasonably estimated. On a quarterly basis, the Company assesses the risk inherent in the Company’s loan portfolio based on qualitative and quantitative trends in the portfolio, including the internal risk classification of loans, historical loss rates, changes in the nature and volume of the loan portfolio, industry or borrower concentrations, delinquency trends, detailed reviews of significant loans with identified weaknesses and the impacts of local, regional and national economic factors on the quality of the loan portfolio. Based on this analysis, the Company records a provision for loan losses in order to maintain the allowance at appropriate levels.

Determining the amount of the allowance is considered a critical accounting estimate, as it requires significant judgment and the use of subjective measurements, including management’s assessment of overall portfolio quality. The Company maintains the allowance at an amount the Company believes is sufficient to provide for estimated losses inherent in the Company’s loan portfolio at each balance sheet date, and fluctuations in the provision for loan losses may result from management’s assessment of the adequacy of the allowance. Changes in these estimates and assumptions are possible and may have a material impact on the Company’s allowance, and therefore the Company’s financial position, liquidity or results of operations.

43

Goodwill and Core Deposit Intangible. The excess purchase price over the fair value of net assets from acquisitions, or goodwill, is evaluated for impairment at least annually and on an interim basis if an event or circumstance indicates that it is likely an impairment has occurred. Prior to 2012, the evaluation of goodwill impairment was a two-step test. Under current accounting standards, the Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, the Company determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two step impairment test is unnecessary. If the Company concludes otherwise, then it is required to perform the first step of the two step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. The Company performs its impairment test annually as of December 31. There have been no circumstances since December 31, 2014 that would indicate any impairment has occurred, therefore, management does not believe goodwill is impaired as of March 31, 2015.

Core deposit intangibles are acquired customer relationships that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. Core deposit intangibles are being amortized on a straight-line basis over their estimated useful lives of ten years. Core deposit intangibles are tested for impairment whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.

44

ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The principal objective of the Company’s asset and liability management function is to evaluate the interest rate risk within the balance sheet and pursue a controlled assumption of interest rate risk while maximizing net income and preserving adequate levels of liquidity and capital. The Investment Committee of the Bank’s Board of Directors has oversight of our asset and liability management function, which is managed by our Chief Financial Officer. Our Chief Financial Officer meets with our senior executive management team regularly to review, among other things, the sensitivity of the Company’s assets and liabilities to market interest rate changes, local and national market conditions and market interest rates. That group also reviews the liquidity, capital, deposit mix, loan mix and investment positions of our Company.

Our management and our Board of Directors are responsible for managing interest rate risk and employing risk management policies that monitor and limit our exposure to interest rate risk. Interest rate risk is measured using net interest income simulations and market value of portfolio equity analyses. These analyses use various assumptions, including the nature and timing of interest rate changes, yield curve shape, prepayments on loans, securities and deposits, deposit decay rates, pricing decisions on loans and deposits, reinvestment/replacement of asset and liability cash flows.

Instantaneous parallel rate shift scenarios are modeled and utilized to evaluate risk and establish exposure limits for acceptable changes in net interest margin. These scenarios, known as rate shocks, simulate an instantaneous change in interest rates and use various assumptions, including, but not limited to, prepayments on loans and securities, deposit decay rates, pricing decisions on loans and deposits, reinvestment and replacement of asset and liability cash flows.

We also analyze the economic value of equity as a secondary measure of interest rate risk. This is a complementary measure to net interest income where the calculated value is the result of the market value of assets less the market value of liabilities. The economic value of equity is a longer term view of interest rate risk because it measures the present value of the future cash flows. The impact of changes in interest rates on this calculation is analyzed for the risk to our future earnings and is used in conjunction with the analyses on net interest income.

We conduct periodic analyses of our sensitivity to interest rate risks through the use of a third-party proprietary interest-rate sensitivity model. That model has been customized to our specifications. The analyses conducted by use of that model are based on current information regarding our actual interest-earnings assets, interest-bearing liabilities, capital and other financial information that we supply. The third party uses that information in the model to estimate our sensitivity to interest rate risk.

Our interest rate risk model indicated that we were in a balanced to slightly asset sensitive position in terms of interest rate sensitivity as of March 31, 2015. The table below illustrates the impact of an immediate and sustained 200 and 100 basis point increase and a 100 basis point decrease in interest rates on net interest income based on the interest rate risk model as of March 31, 2015:

Hypothetical Shift in Interest Rates (in bps)	% Change in Projected Net Interest Income
200	(1.06)%
100	(0.82)%
(100)	(4.21)%

These are good faith estimates and assume that the composition of our interest sensitive assets and liabilities existing at each period-end and is based on future maturities and market pricing over the relevant twelve month measurement period and that changes in market interest rates are instantaneous and sustained across the yield curve regardless of duration of pricing characteristics of specific assets or liabilities. Also, this analysis does not contemplate any actions that we might undertake in response to changes in market interest rates. We believe these estimates are not necessarily indicative of what actually could occur in the event of immediate interest rate increases or decreases of this magnitude. As interest-bearing assets and liabilities re-price in different time frames and proportions to market interest rate movements, various assumptions must be made based on historical relationships of these variables in reaching any conclusion. Since these correlations are based on competitive and market conditions, we anticipate that our future results will likely be different from the foregoing estimates, and such differences could be material.

45

ITEM 4.CONTROLS AND PROCEDURES

Evaluation of disclosure controls and procedures. An evaluation of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this Quarterly Report on Form 10-Q was performed under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective to provide reasonable assurance that information required to be disclosed by the Company in the reports that it files or submits under the Securities Exchange Act of 1934, as amended, is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure and are effective to provide reasonable assurance that such information is recorded, processed, summarized and reported within the time periods specified by the SEC's rules and forms.

Changes in internal control over financial reporting. There were no changes in the Company’s internal control over financial reporting during the three months ended March 31, 2015 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

46

PART II

Item 1. LEGAL PROCEEDINGS

In the normal course of business, the Company and Independent Bank are named or threatened to be named as defendants in various lawsuits. Managements of the Company and Independent Bank, following consultation with legal counsel, do not expect the ultimate disposition of any or a combination of these matters to have a material adverse effect on the Company’s business, financial condition or results of operations.

Item 1A. RISK FACTORS

In evaluating an investment in our common stock, investors should consider carefully, among other things, the risk factors previously disclosed in Part I, Item 1A of our Annual Report on Form 10‑K for the year ended December 31, 2014, as well as the information contained in this Quarterly Report on Form 10-Q and our other reports and registrations statements filed with the SEC.

Item 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None

Item 3. DEFAULTS UPON SENIOR SECURITIES

None

Item 4. MINE SAFETY DISCLOSURES

Not applicable

Item 5. OTHER INFORMATION

None

47

Item 6. EXHIBITS

The following documents are filed as exhibits to this Quarterly Report on Form 10-Q:

Exhibit 3.1	Amended and Restated Certificate of Formation of Independent Bank Group, Inc., which is incorporated herein by reference to Exhibit 3.1 to Registration Statement on Form S-1 of Independent Bank Group, Inc. filed with the SEC on February 27, 2013 (the "S-1 Registration Statement").
Exhibit 3.2	Certificate of Amendment to Amended and Restated Certificate of Formation of Independent Bank Group, Inc., which is incorporated herein by reference to Exhibit 3.3 to Amendment No. 2 to the S-1 Registration Statement filed with the SEC on April 1, 2013.
Exhibit 3.3	Third Amended and Restated Bylaws of Independent Bank Group, Inc., which are incorporated herein by reference to Exhibit 3.2 to Amendment No. 1 to the S-1 Registration Statement filed with the SEC on March 18, 2013.
Exhibit 3.4	Statement of Designations of Senior Non-Cumulative Perpetual Preferred Stock, Series A of Independent Bank Group, Inc., as filed with the Office of the Secretary of State of the State of Texas on April 15, 2014, which is incorporated herein by reference to Exhibit 3.1 to the Current Report on Form 8-K of Independent Bank Group, Inc. filed with the SEC on April 17, 2014.
Exhibit 3.5	Certificate of Merger, dated January 2, 2014, of Live Oak Financial Corp. with and into Independent Bank Group, Inc., which is incorporated herein by reference to Exhibit 3.5 to Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (Registration No. 333-196627) filed with the SEC on June 25, 2014 (the “S-3 Registration Statement”)
Exhibit 3.6	Certificate of Merger, dated April 15, 2014, of BOH Holdings, Inc. with and into Independent Bank Group, Inc., which is incorporated herein by reference to Exhibit 3.6 to Amendment No. 1 to the S-3 Registration Statement filed with the SEC on June 25, 2014
Exhibit 4.1	Form of certificate representing shares of the Registrant’s common stock, which is incorporated herein by reference to Exhibit 4.1 to Amendment No. 1 to the Form S-1 Registration Statement filed with the SEC on March 18, 2013
Exhibit 4.2	Form of Common Stock Purchase Warrant, with schedules of differences, which is incorporated herein by reference to Exhibit 4.2 to the Form S-1 Registration Statement
Exhibit 4.3	Form of certificate representing shares of the Registrant’s Series A preferred stock, which is incorporated herein by reference to Exhibit 4.3 to the S-3 Registration Statement
Exhibit 4.4	Subordinated Debt Indenture, dated as of June 25, 2014, between Independent Bank Group, Inc. and Wells Fargo Bank, National Association, in its capacity as Indenture Trustee, which is incorporated herein by reference to Exhibit 4.6 to the Registrant’s Amendment No. 1 to the S-3 Registration Statement filed with the SEC on June 25, 2014
Exhibit 4.5	First Supplemental Indenture, dated as of July 17, 2014, between Independent Bank Group, Inc. and Wells Fargo Bank Shareowner Services, in its capacity as Indenture Trustee, which is incorporated herein by reference to Exhibit 4.2 to the Registrant’s Current Report on Form 8-K, dated July 17, 2014.
Exhibit 4.6	Form of Global Note to represent the 5.875% Subordinated Notes due August 1, 2024, of the Registrant, which is incorporated herein by reference to Exhibit 4.3 to the Registrant’s Current Report on Form 8-K, dated July 17, 2014.
Exhibit 4.7	Independent Bank 401(k) Profit Sharing Plan, including related Adoption Agreement, which is incorporated herein by reference to Exhibit 4.9 to the Registrant’s Registration Statement on Form S-8 filed with the SEC on August 29, 2014.
The other instruments defining the rights of holders of the long-term debt securities of the Registrant and its subsidiaries are omitted pursuant to section (b)(4)(iii)(A) of Item 601 of Regulation S-K. The Registrant hereby agrees to furnish copies of these instruments to the Securities and Exchange Commission upon request.

48

Exhibit 10.1	2015 Performance Award Plan, which is incorporated by reference to Annex A of the Company’s definitive Proxy Statement for its 2015 Annual Meeting of Shareholders, dated April 13, 2015.
Exhibit 31.1*	Chief Executive Officer Section 302 Certification
Exhibit 31.2*	Chief Financial Officer Section 302 Certification
Exhibit 32.1**	Chief Executive Officer Section 906 Certification
Exhibit 32.2**	Chief Financial Officer Section 906 Certification
Exhibit 101.INS *	XBRL Instance Document
Exhibit 101.SCH *	XBRL Taxonomy Extension Schema Document
Exhibit 101.CAL *	XBRL Taxonomy Extension Calculation Linkbase Document
Exhibit 101.DEF *	XBRL Taxonomy Extension Definition Linkbase Document
Exhibit 101.LAB *	XBRL Taxonomy Extension Label Linkbase Document
Exhibit 101.PRE *	XBRL Taxonomy Extension Presentation Linkbase Document

* Filed herewith as an Exhibit.

** Furnished herewith as an Exhibit.

49

Signatures

Pursuant to the requirements 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.

	Independent Bank Group, Inc.
Date: May 1, 2015	By: /s/ David R. Brooks
	David R. Brooks
	Chairman and Chief Executive Officer

Date: May 1, 2015	By: /s/ Michelle S. Hickox
	Michelle S. Hickox
	Executive Vice President
	Chief Financial Officer

50

EX-31.1

Exhibit 31.1

I, David R. Brooks, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Independent Bank Group, Inc. (the “registrant”);

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 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 related 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 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 officer 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:

(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: May 1, 2015	/s/ David R. Brooks
	David R. Brooks Chairman and Chief Executive Officer

EX-31.2

Exhibit 31.2

I, Michelle S. Hickox, certify that:

1.   I have reviewed this Quarterly Report on Form 10-Q of Independent Bank Group, Inc. (the “registrant”);

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 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 related 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 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 officer 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:

(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: May 1, 2015	/s/ Michelle S. Hickox
	Michelle S. Hickox Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350 (AS ADOPTED

PURSUANT TO SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002)

In connection with the Quarterly Report of Independent Bank Group, Inc. (the “Company”) on Form 10-Q for the period ending March 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David R. Brooks, Chairman and Chief Executive Officer of the Company, certify to my knowledge and in my capacity as an officer of the Company, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; 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 the dates and for the periods expressed in the Report.

IN WITNESS WHEREOF, the undersigned has executed this Certificate, effective as of May 1, 2015.

/s/ David R. Brooks

David R. Brooks

Chairman and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350 (AS ADOPTED

PURSUANT TO SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002)

In connection with the Quarterly Report of Independent Bank Group, Inc. (the “Company”) on Form 10-Q for the period ending March 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michelle S. Hickox, Executive Vice President and Chief Financial Officer of the Company, certify to my knowledge and in my capacity as an officer of the Company, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; 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 the dates and for the periods expressed in the Report.

IN WITNESS WHEREOF, the undersigned has executed this Certificate, effective as of May 1, 2015.

/s/ Michelle S. Hickox

Michelle S. Hickox

Executive Vice President and Chief Financial Officer

XML

Securities Available for Sale-Summary of Unrealized Losses and Fair Value of Securities in COntinuous Unrealized Loss Positions (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015 security	Dec. 31, 2014 security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than 12 Months	10	50
Less than 12 months: Estimated Fair Value	$ 3,690	$ 23,032
Less than 12 months: Unrealized Losses	(12)	(221)
Number of Securities, Greater than 12 Months	37	27
Greater Than 12 Months: Estimated Fair Value	32,867	31,212
Greater Than 12 Months: Unrealized Losses	(411)	(666)
Total: Estimated Fair Value	36,557	54,244
Total: Unrealized Losses	(423)	(887)
Government agency securities
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than 12 Months	0	6
Less than 12 months: Estimated Fair Value	0	6,396
Less than 12 months: Unrealized Losses	0	(24)
Number of Securities, Greater than 12 Months	12	14
Greater Than 12 Months: Estimated Fair Value	20,877	22,671
Greater Than 12 Months: Unrealized Losses	(121)	(326)
Total: Estimated Fair Value	20,877	29,067
Total: Unrealized Losses	(121)	(350)
Obligations of state and municipal subdivisions
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than 12 Months	9	44
Less than 12 months: Estimated Fair Value	3,597	16,636
Less than 12 months: Unrealized Losses	(11)	(197)
Number of Securities, Greater than 12 Months	25	13
Greater Than 12 Months: Estimated Fair Value	11,990	8,541
Greater Than 12 Months: Unrealized Losses	(290)	(340)
Total: Estimated Fair Value	15,587	25,177
Total: Unrealized Losses	(301)	(537)
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than 12 Months	1
Less than 12 months: Estimated Fair Value	93
Less than 12 months: Unrealized Losses	(1)
Number of Securities, Greater than 12 Months	0
Greater Than 12 Months: Estimated Fair Value	0
Greater Than 12 Months: Unrealized Losses	0
Total: Estimated Fair Value	93
Total: Unrealized Losses	$ (1)

XML

Repurchase Agreements and Other Borrowings - Note Payable (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Jan. 15, 2015	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt Disclosure [Abstract]
Repurchase agreements		$ 5,783		$ 4,012
Securities pledged under repurchase agreements		5,784
Other borrowings and due to related parties		72,105		72,730
Repayments of subordinated debt	$ 625	$ 625	$ 0

XML

Loans, Net and Allowance for Loan Losses - Summary of Loans by Credit Quality Indicator (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 3,303,949	$ 3,201,084
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	697,449	672,052
Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	1,857,406	1,785,398
Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	515,716	514,025
Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	148,202	138,278
Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	37,650	38,822
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	47,387	52,267
Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	139	242
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	3,193,179	3,142,344
Pass | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	619,818	647,894
Pass | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	1,832,284	1,759,533
Pass | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	507,953	505,920
Pass | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	148,202	138,278
Pass | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	37,595	38,422
Pass | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	47,188	52,055
Pass | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	139	242
Pass/ Watch
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	68,718	27,870
Pass/ Watch | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	57,847	16,919
Pass/ Watch | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	8,626	8,667
Pass/ Watch | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	2,155	2,188
Pass/ Watch | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Pass/ Watch | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	55	57
Pass/ Watch | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	35	39
Pass/ Watch | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	19,733	7,360
OAEM | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	13,536	977
OAEM | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	5,962	6,008
OAEM | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	190	325
OAEM | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
OAEM | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
OAEM | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	45	50
OAEM | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	22,319	23,510
Substandard | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	6,248	6,262
Substandard | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	10,534	11,190
Substandard | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	5,418	5,592
Substandard | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Substandard | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	343
Substandard | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	119	123
Substandard | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 0	$ 0

XML

Income Taxes - Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 4,536	$ 2,339
Effective tax rates (percent)	32.40%	32.80%

XML

Loans, Net and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 contract	Mar. 31, 2014 contract
Financing Receivable, Modifications [Line Items]
Number of contracts	0	1
Pre-restructuring outstanding recorded investment	$ 0	$ 700
Post-restructuring outstanding recorded investment	0	700
Commercial
Financing Receivable, Modifications [Line Items]
Number of contracts	0	0
Pre-restructuring outstanding recorded investment	0	0
Post-restructuring outstanding recorded investment	0	0
Commercial Real Estate, Land and Land Development
Financing Receivable, Modifications [Line Items]
Number of contracts	0	1
Pre-restructuring outstanding recorded investment	0	700
Post-restructuring outstanding recorded investment	0	700
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of contracts	0	0
Pre-restructuring outstanding recorded investment	0	0
Post-restructuring outstanding recorded investment	0	0
Single-Family Interim Construction
Financing Receivable, Modifications [Line Items]
Number of contracts	0	0
Pre-restructuring outstanding recorded investment	0	0
Post-restructuring outstanding recorded investment	0	0
Agricultural
Financing Receivable, Modifications [Line Items]
Number of contracts	0	0
Pre-restructuring outstanding recorded investment	0	0
Post-restructuring outstanding recorded investment	0	0
Consumer
Financing Receivable, Modifications [Line Items]
Number of contracts	0	0
Pre-restructuring outstanding recorded investment	0	0
Post-restructuring outstanding recorded investment	0	0
Other Loan
Financing Receivable, Modifications [Line Items]
Number of contracts	0	0
Pre-restructuring outstanding recorded investment	0	0
Post-restructuring outstanding recorded investment	$ 0	$ 0

XML

Statement of Cash Flows - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash transactions:
Interest expense paid	$ 5,754	$ 3,045
Income taxes paid	6,150	2,700
Noncash transactions:
Transfers of loans to other real estate owned	0	120
Loans to facilitate the sale of other real estate owned	0	48
Securities purchased, not yet settled	0	2,000
Excess tax benefit on restricted stock vested	3	1,022
Series A Preferred Stock
Noncash transactions:
Dividends declared, not yet paid	$ 60	$ 0

XML

Fair Value Measurements-Assets and Liabilities at Fair Value on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
U.S. treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	$ 1,008	$ 1,006
U.S. treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
U.S. treasuries | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	1,008	1,006
U.S. treasuries | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	54,289	58,023
Government agency securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Government agency securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	54,289	58,023
Government agency securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Obligations of state and municipal subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	75,407	76,899
Obligations of state and municipal subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Obligations of state and municipal subdivisions | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	75,407	76,899
Obligations of state and municipal subdivisions | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	1,098	1,081
Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Corporate bonds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	1,098	1,081
Corporate bonds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	66,347	69,053
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	66,347	69,053
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	$ 0	$ 0

XML

Loans, Net and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Compositions of Loans

Loans, net at March 31, 2015 and December 31, 2014, consisted of the following:

	March 31,			December 31,
	2015			2014
Commercial	$	697,449		$	672,052
Real estate:
Commercial	1,555,462			1,450,434
Commercial construction, land and land development	301,944			334,964
Residential	515,716			514,025
Single family interim construction	148,202			138,278
Agricultural	37,650			38,822
Consumer	47,387			52,267
Other	139			242
	3,303,949			3,201,084
Deferred loan fees	(701		)	(487		)
Allowance for loan losses	(20,227		)	(18,552		)
	$	3,283,021		$	3,182,045

Summary of Activity in Allowance for Loan Losses by Loan Class

The following is a summary of the activity in the allowance for loan losses by loan class for the three months ended March 31, 2015 and 2014:

	Commercial			Commercial Real Estate, Land and Land Development			Residential Real Estate			Single-Family Interim Construction			Agricultural			Consumer			Other		Unallocated		Total
Three months ended March 31, 2015
Balance at the beginning of period	$	5,051		$	10,110		$	2,205		$	669		$	246		$	146		$	—	$	125	$	18,552
Provision for loan losses	1,023			526			(13		)	65			(8		)	29			—		48		1,670
Charge-offs	—			—			—			—			—			(36		)	—		—		(36		)
Recoveries	4			18			2			—			—			17			—		—		41
Balance at end of period	$	6,078		$	10,654		$	2,194		$	734		$	238		$	156		$	—	$	173	$	20,227
Three months ended March 31, 2014
Balance at the beginning of period	$	2,401		$	7,872		$	2,440		$	577		$	238		$	363		$	—	$	69	$	13,960
Provision for loan losses	578			256			(163		)	(42		)	6			(6		)	—		624		1,253
Charge-offs	(363		)	(21		)	(1		)	—			—			(14		)	—		—		(399		)
Recoveries	4			10			2			1			—			10			—		—		27
Balance at end of period	$	2,620		$	8,117		$	2,278		$	536		$	244		$	353		$	—	$	693	$	14,841

The following table details the amount of the allowance for loan losses and recorded investment in loans by class as of March 31, 2015 and December 31, 2014:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Unallocated		Total
March 31, 2015
Allowance for losses:
Individually evaluated for impairment	$	1,120	$	64	$	—	$	—	$	—	$	—	$	—	$	—	$	1,184
Collectively evaluated for impairment	4,958		10,590		2,194		734		238		156		—		173		19,043
Loans acquired with deteriorated credit quality	—		—		—		—		—		—		—		—		—
Ending balance	$	6,078	$	10,654	$	2,194	$	734	$	238	$	156	$	—	$	173	$	20,227
Loans:
Individually evaluated for impairment	$	5,899	$	6,486	$	3,216	$	—	$	—	$	76	$	—	$	—	$	15,677
Collectively evaluated for impairment	688,120		1,801,261		510,777		148,202		37,650		47,286		139		—		3,233,435
Acquired with deteriorated credit quality	3,430		49,659		1,723		—		—		25		—		—		54,837
Ending balance	$	697,449	$	1,857,406	$	515,716	$	148,202	$	37,650	$	47,387	$	139	$	—	$	3,303,949
December 31, 2014
Allowance for losses:
Individually evaluated for impairment	$	339	$	124	$	8	$	—	$	—	$	4	$	—	$	—	$	475
Collectively evaluated for impairment	4,712		9,986		2,197		669		246		142		—		125		18,077
Loans acquired with deteriorated credit quality	—		—		—		—		—		—		—		—		—
Ending balance	$	5,051	$	10,110	$	2,205	$	669	$	246	$	146	$	—	$	125	$	18,552
Loans:
Individually evaluated for impairment	$	1,479	$	6,768	$	3,387	$	—	$	—	$	75	$	—	$	—	$	11,709
Collectively evaluated for impairment	666,830		1,724,514		508,833		138,278		38,822		52,159		242		—		3,129,678
Acquired with deteriorated credit quality	3,743		54,116		1,805		—		—		33		—		—		59,697
Ending balance	$	672,052	$	1,785,398	$	514,025	$	138,278	$	38,822	$	52,267	$	242	$	—	$	3,201,084

Summary of Nonperforming Loans by Loan Class

Nonperforming loans by loan class at March 31, 2015 and December 31, 2014, are summarized as follows:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
March 31, 2015
Nonaccrual loans	$	5,873	$	57	$	631	$	—	$	—	$	71	$	—	$	6,632
Loans past due 90 days and still accruing	—		—		—		—		—		—		—		—
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	27		4,426		2,571		—		—		5		—		7,029
	$	5,900	$	4,483	$	3,202	$	—	$	—	$	76	$	—	$	13,661
December 31, 2014
Nonaccrual loans	$	1,449	$	70	$	2,117	$	—	$	—	$	67	$	—	$	3,703
Loans past due 90 days and still accruing	157		288		—		—		—		6		—		451
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	30		4,668		1,254		—		—		8		—		5,960
	$	1,636	$	5,026	$	3,371	$	—	$	—	$	81	$	—	$	10,114

Impaired Loans by Loan Class

Impaired loans by loan class at March 31, 2015 and December 31, 2014, are summarized as follows:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
March 31, 2015
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	$	5,865	$	1,441	$	—	$	—	$	—	$	—	$	—	$	7,306
Impaired loans with no allowance for loan losses	35		5,044		3,216		—		—		76		—		8,371
Total	$	5,900	$	6,485	$	3,216	$	—	$	—	$	76	$	—	$	15,677
Unpaid principal balance of impaired loans	$	5,904	$	6,990	$	3,375	$	—	$	—	$	95	$	—	$	16,364
Allowance for loan losses on impaired loans	$	1,120	$	64	$	—	$	—	$	—	$	—	$	—	$	1,184
December 31, 2014
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	$	1,475	$	2,056	$	13	$	—	$	—	$	7	$	—	$	3,551
Impaired loans with no allowance for loan losses	4		4,712		3,374		—		—		68		—		8,158
Total	$	1,479	$	6,768	$	3,387	$	—	$	—	$	75	$	—	$	11,709
Unpaid principal balance of impaired loans	$	1,482	$	7,274	$	3,605	$	—	$	—	$	93	$	—	$	12,454
Allowance for loan losses on impaired loans	$	339	$	124	$	8	$	—	$	—	$	4	$	—	$	475
For the three months ended March 31, 2015
Average recorded investment in impaired loans	$	3,689	$	6,627	$	3,302	$	—	$	—	$	76	$	—	$	13,694
Interest income recognized on impaired loans	$	21	$	93	$	29	$	—	$	—	$	—	$	—	$	143
For the three months ended March 31, 2014
Average recorded investment in impaired loans	$	376	$	7,788	$	3,207	$	85	$	—	$	63	$	—	$	11,519
Interest income recognized on impaired loans	$	3	$	107	$	28	$	—	$	—	$	—	$	—	$	138

Summary of Troubled Debt Restructurings

Following is a summary of loans modified under troubled debt restructurings during the three months ended March 31, 2015 and 2014:

.

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
Troubled debt restructurings during the three months ended March 31, 2015
Number of contracts	—		—		—		—		—		—		—		—
Pre-restructuring outstanding recorded investment	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Post-restructuring outstanding recorded investment	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Troubled debt restructurings during the three months ended March 31, 2014
Number of contracts	—		1		—		—		—		—		—		1
Pre-restructuring outstanding recorded investment	$	—	$	700	$	—	$	—	$	—	$	—	$	—	$	700
Post-restructuring outstanding recorded investment	$	—	$	700	$	—	$	—	$	—	$	—	$	—	$	700

Aging of Past Due Loans by Loan Class

The following table presents information regarding the aging of past due loans by loan class as of March 31, 2015 and December 31, 2014:

	Loans 30-89 Days Past Due		Loans 90 or More Past Due		Total Past Due Loans		Current Loans		Total Loans
March 31, 2015
Commercial	$	244	$	5,838	$	6,082	$	691,367	$	697,449
Commercial real estate, land and land  development	86		—		86		1,857,320		1,857,406
Residential real estate	1,087		404		1,491		514,225		515,716
Single-family interim construction	—		—		—		148,202		148,202
Agricultural	—		—		—		37,650		37,650
Consumer	1,363		11		1,374		46,013		47,387
Other	—		—		—		139		139
	$	2,780	$	6,253	$	9,033	$	3,294,916	$	3,303,949
December 31, 2014
Commercial	$	6,006	$	157	$	6,163	$	665,889	$	672,052
Commercial real estate, land and land  development	973		288		1,261		1,784,137		1,785,398
Residential real estate	1,258		554		1,812		512,213		514,025
Single-family interim construction	410		—		410		137,868		138,278
Agricultural	—		—		—		38,822		38,822
Consumer	1,899		8		1,907		50,360		52,267
Other	—		—		—		242		242
	$	10,546	$	1,007	$	11,553	$	3,189,531	$	3,201,084

Summary of Loans by Credit Quality Indicator by Class

A summary of loans by credit quality indicator by class as of March 31, 2015 and December 31, 2014, is as follows:

	Pass		Pass/ Watch		OAEM		Substandard		Doubtful		Total
March 31, 2015
Commercial	$	619,818	$	57,847	$	13,536	$	6,248	$	—	$	697,449
Commercial real estate, construction, land  and land development	1,832,284		8,626		5,962		10,534		—		1,857,406
Residential real estate	507,953		2,155		190		5,418		—		515,716
Single-family interim construction	148,202		—		—		—		—		148,202
Agricultural	37,595		55		—		—		—		37,650
Consumer	47,188		35		45		119		—		47,387
Other	139		—		—		—		—		139
	$	3,193,179	$	68,718	$	19,733	$	22,319	$	—	$	3,303,949
December 31, 2014
Commercial	$	647,894	$	16,919	$	977	$	6,262	$	—	$	672,052
Commercial real estate, construction, land  and land development	1,759,533		8,667		6,008		11,190		—		1,785,398
Residential real estate	505,920		2,188		325		5,592		—		514,025
Single-family interim construction	138,278		—		—		—		—		138,278
Agricultural	38,422		57		—		343		—		38,822
Consumer	52,055		39		50		123		—		52,267
Other	242		—		—		—		—		242
	$	3,142,344	$	27,870	$	7,360	$	23,510	$	—	$	3,201,084

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period

The following table summarizes the outstanding balance and related carrying amount of purchased credit impaired loans by acquired bank as of the respective acquisition date for the acquisitions occurring in 2014:

	Acquisition Date
	October 1, 2014			April 15, 2014			January 1, 2014
	Houston City Bancshares, Inc.			BOH Holdings, Inc.			Live Oak Financial Corp.
Outstanding balance	$	12,021		$	55,718		$	3,583
Nonaccretable difference	(1,240		)	(5,798		)	(519		)
Accretable yield	(561		)	(2,579		)	(182		)
Carrying amount	$	10,220		$	47,341		$	2,882

The carrying amount of all acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at March 31, 2015 and December 31, 2014, were as follows:

	March 31, 2015		December 31, 2014
Outstanding balance	$	63,595	$	69,371
Carrying amount	54,837		59,697

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield

The changes in accretable yield during the three months ended March 31, 2015 in regard to loans transferred at acquisition for which it was probable that all contractually required payments would not be collected are presented in the table below. Activity in accretable yield for the three months ended March 31, 2014 was not material.

	Three Months Ended March 31, 2015
Balance at January 1, 2015	$	2,546
Additions	—
Accretion	(184		)
Net transfers to/from nonaccretable	—
Balance at March 31, 2015	$	2,362

XML

Loans, Net and Allowance for Loan Losses Loans, Net and Allowance for Loan Losses - Purchased Credit Impaired Loans in Consolidated Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Outstanding balance	$ 63,595	$ 69,371
Carrying amount	$ 54,837	$ 59,697

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Loans, Net and Allowance for Loan Losses Loans, Net and Allowance for Loan Losses - Rollforward of Activity in Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	$ 18,552	$ 13,960
Provision for loan losses	1,670	1,253
Charge-offs	(36)	(399)
Recoveries	41	27
Balance at end of period	20,227	14,841
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	5,051	2,401
Provision for loan losses	1,023	578
Charge-offs	0	(363)
Recoveries	4	4
Balance at end of period	6,078	2,620
Commercial Real Estate, Land and Land Development
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	10,110	7,872
Provision for loan losses	526	256
Charge-offs	0	(21)
Recoveries	18	10
Balance at end of period	10,654	8,117
Residential Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	2,205	2,440
Provision for loan losses	(13)	(163)
Charge-offs	0	(1)
Recoveries	2	2
Balance at end of period	2,194	2,278
Single-Family Interim Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	669	577
Provision for loan losses	65	(42)
Charge-offs	0	0
Recoveries	0	1
Balance at end of period	734	536
Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	246	238
Provision for loan losses	(8)	6
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	238	244
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	146	363
Provision for loan losses	29	(6)
Charge-offs	(36)	(14)
Recoveries	17	10
Balance at end of period	156	353
Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	0	0
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	0	0
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	125	69
Provision for loan losses	48	624
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	$ 173	$ 693

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Securities Available for Sale-Amortized Cost of Securities and Approximate Fair Values (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 193,983	$ 203,277
Gross Unrealized Gains	4,589	3,672
Gross Unrealized Losses	(423)	(887)
Fair Value	198,149	206,062
U.S. treasuries
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	999	999
Gross Unrealized Gains	9	7
Gross Unrealized Losses	0	0
Fair Value	1,008	1,006
Government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53,964	58,174
Gross Unrealized Gains	446	199
Gross Unrealized Losses	(121)	(350)
Fair Value	54,289	58,023
Obligations of state and municipal subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	73,587	75,599
Gross Unrealized Gains	2,121	1,837
Gross Unrealized Losses	(301)	(537)
Fair Value	75,407	76,899
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,066	1,068
Gross Unrealized Gains	32	13
Gross Unrealized Losses	0	0
Fair Value	1,098	1,081
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	64,367	67,437
Gross Unrealized Gains	1,981	1,616
Gross Unrealized Losses	(1)	0
Fair Value	$ 66,347	$ 69,053

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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Financial instruments with off-balance sheet risk	$ 573,275	$ 574,452
Commitments to extend credit
Loss Contingencies [Line Items]
Financial instruments with off-balance sheet risk	566,165	565,881
Standby letters of credit
Loss Contingencies [Line Items]
Financial instruments with off-balance sheet risk	$ 7,110	$ 8,571

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Stock Awards and Stock Warrants - Future Vesting Schedule of Nonvested Shares (Detail)	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	441,994
First year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	110,675
Second year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	127,348
Third year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	111,307
Fourth year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	58,564
Fifth year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	34,100

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Loans, Net and Allowance for Loan Losses - Aging of Past Due Loans by Loan Class (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 9,033	$ 11,553
Current Loans	3,294,916	3,189,531
Ending balance	3,303,949	3,201,084
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	6,082	6,163
Current Loans	691,367	665,889
Ending balance	697,449	672,052
Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	86	1,261
Current Loans	1,857,320	1,784,137
Ending balance	1,857,406	1,785,398
Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,491	1,812
Current Loans	514,225	512,213
Ending balance	515,716	514,025
Single-Family Interim Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	410
Current Loans	148,202	137,868
Ending balance	148,202	138,278
Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	37,650	38,822
Ending balance	37,650	38,822
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,374	1,907
Current Loans	46,013	50,360
Ending balance	47,387	52,267
Other Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	139	242
Ending balance	139	242
Loans 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,780	10,546
Loans 30-89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	244	6,006
Loans 30-89 Days Past Due | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	86	973
Loans 30-89 Days Past Due | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,087	1,258
Loans 30-89 Days Past Due | Single-Family Interim Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	410
Loans 30-89 Days Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,363	1,899
Loans 30-89 Days Past Due | Other Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	6,253	1,007
Loans 90 or More Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	5,838	157
Loans 90 or More Past Due | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	288
Loans 90 or More Past Due | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	404	554
Loans 90 or More Past Due | Single-Family Interim Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	11	8
Loans 90 or More Past Due | Other Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 0	$ 0

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Nature of Operations: Independent Bank Group, Inc. (IBG) through its subsidiary, Independent Bank, a Texas state banking corporation (Bank) (collectively known as the Company), provides a full range of banking services to individual and corporate customers in the North Texas, Central Texas and Houston areas through its various branch locations in those areas. The Company is engaged in traditional community banking activities, which include commercial and retail lending, deposit gathering, investment and liquidity management activities. The Company’s primary deposit products are demand deposits, money market accounts and certificates of deposit, and its primary lending products are commercial business and real estate, real estate mortgage and consumer loans.

Basis of Presentation: The accompanying consolidated financial statements include the accounts of IBG, its wholly-owned subsidiaries, the Bank and IBG Adriatica Holdings, Inc. (Adriatica) and the Bank’s wholly-owned subsidiaries, IBG Real Estate Holdings, Inc. and IBG Aircraft Acquisition, Inc. Adriatica was formed in 2011 to acquire a mixed use residential and retail real estate development in McKinney, Texas. Adriatica was dissolved during the first quarter of 2014. All material intercompany transactions and balances have been eliminated in consolidation. In addition, the Company wholly-owns IB Trust I (Trust I), IB Trust II (Trust II), IB Trust III (Trust III), IB Centex Trust I (Centex Trust I) and Community Group Statutory Trust I (CGI Trust I). The Trusts were formed to issue trust preferred securities and do not meet the criteria for consolidation.

The consolidated interim financial statements are unaudited, but include all adjustments, which, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in the Company's Annual Report of Form10-K for the year ended December 31, 2014. The consolidated statement of condition at December 31, 2014 had been derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements.

Segment Reporting: The Company has one reportable segment. The Company’s chief operating decision-maker uses consolidated results to make operating and strategic decisions.

Subsequent events: Companies are required to evaluate events and transactions that occur after the balance sheet date but before the date the financial statements are issued. They must recognize in the financial statements the effect of all events or transactions that provide additional evidence of conditions that existed at the balance sheet date, including the estimates inherent in the financial statement preparation process. Entities shall not recognize the impact of events or transactions that provide evidence about conditions that did not exist at the balance sheet date but arose after that date. The Company has evaluated subsequent events through the date of filing these financial statements with the SEC and noted no subsequent events requiring financial statement recognition or disclosure, except as disclosed in Note 12.

Earnings per share: Basic earnings per common share are net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. The unvested share-based payment awards that contain rights to non forfeitable dividends are considered participating securities for this calculation. Diluted earnings per common share include the dilutive effect of additional potential common shares issuable under stock warrants. The dilutive effect of participating non vested common stock was not included as it was anti-dilutive. Proceeds from the assumed exercise of dilutive stock warrants are assumed to be used to repurchase common stock at the average market price.

	Three Months Ended March 31,
	2015			2014
Basic earnings per share:
Net income	$	9,452		$	4,801
Less: Preferred stock dividends	(60		)	—
Net income after preferred stock dividends	9,392			4,801
Less:
Undistributed earnings allocated to participating securities	178			58
Dividends paid on participating securities	30			11
Net income available to common shareholders	$	9,184		$	4,732
Weighted-average basic shares outstanding	16,712,527			12,403,387
Basic earnings per share	$	0.55		$	0.38
Diluted earnings per share:
Net income available to common shareholders	$	9,184		$	4,732
Total weighted-average basic shares outstanding	16,712,527			12,403,387
Add dilutive stock warrants	77,933			101,643
Total weighted-average diluted shares outstanding	16,790,460			12,505,030
Diluted earnings per share	$	0.55		$	0.38
Anti-dilutive participating securities	19,705			109,040

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Stock Awards and Stock Warrants - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock vesting period			5 years
Compensation expense	$ 1,097	$ 390
Period for recognition	3 years 3 months 29 days
Estimated future compensation expense	13,650
Fair value of common stock awards vested	678	4,869
Excess tax benefit on restricted stock vested	$ 3	$ 1,022
Issuance of warrant (shares)	150,544
Purchase price of common stock, per share (usd per share)	$ 17.19
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (shares)	800,000
Minimum | 2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock vesting period	3 years
Maximum | 2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock vesting period	5 years

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Loans, Net and Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses by Loan Class (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Allowance for losses:
Individually evaluated for impairment	$ 1,184	$ 475
Collectively evaluated for impairment	19,043	18,077
Ending balance	20,227	18,552	14,841	13,960
Loans:
Individually evaluated for impairment	15,677	11,709
Collectively evaluated for impairment	3,233,435	3,129,678
Ending balance	3,303,949	3,201,084
Commercial
Allowance for losses:
Individually evaluated for impairment	1,120	339
Collectively evaluated for impairment	4,958	4,712
Ending balance	6,078	5,051	2,620	2,401
Loans:
Individually evaluated for impairment	5,899	1,479
Collectively evaluated for impairment	688,120	666,830
Ending balance	697,449	672,052
Commercial Real Estate, Land and Land Development
Allowance for losses:
Individually evaluated for impairment	64	124
Collectively evaluated for impairment	10,590	9,986
Ending balance	10,654	10,110	8,117	7,872
Loans:
Individually evaluated for impairment	6,486	6,768
Collectively evaluated for impairment	1,801,261	1,724,514
Ending balance	1,857,406	1,785,398
Residential Real Estate
Allowance for losses:
Individually evaluated for impairment	0	8
Collectively evaluated for impairment	2,194	2,197
Ending balance	2,194	2,205	2,278	2,440
Loans:
Individually evaluated for impairment	3,216	3,387
Collectively evaluated for impairment	510,777	508,833
Ending balance	515,716	514,025
Single-Family Interim Construction
Allowance for losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	734	669
Ending balance	734	669	536	577
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	148,202	138,278
Ending balance	148,202	138,278
Agricultural
Allowance for losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	238	246
Ending balance	238	246	244	238
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	37,650	38,822
Ending balance	37,650	38,822
Consumer
Allowance for losses:
Individually evaluated for impairment	0	4
Collectively evaluated for impairment	156	142
Ending balance	156	146	353	363
Loans:
Individually evaluated for impairment	76	75
Collectively evaluated for impairment	47,286	52,159
Ending balance	47,387	52,267
Other
Allowance for losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Ending balance	0	0	0	0
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	139	242
Ending balance	139	242
Unallocated
Allowance for losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	173	125
Ending balance	173	125	693	69
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Ending balance	0	0
Receivables Acquired with Deteriorated Credit Quality
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	54,837	59,697
Receivables Acquired with Deteriorated Credit Quality | Commercial
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	3,430	3,743
Receivables Acquired with Deteriorated Credit Quality | Commercial Real Estate, Land and Land Development
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	49,659	54,116
Receivables Acquired with Deteriorated Credit Quality | Residential Real Estate
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	1,723	1,805
Receivables Acquired with Deteriorated Credit Quality | Single-Family Interim Construction
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	0	0
Receivables Acquired with Deteriorated Credit Quality | Agricultural
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	0	0
Receivables Acquired with Deteriorated Credit Quality | Consumer
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	25	33
Receivables Acquired with Deteriorated Credit Quality | Other
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	0	0
Receivables Acquired with Deteriorated Credit Quality | Unallocated
Allowance for losses:
Loans acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	$ 0	$ 0

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Stock Awards and Stock Warrants (Tables)

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Nonvested Shares Activity

The following table summarizes the activity in nonvested shares for the three months ended March 31, 2015 and 2014:

	Number of Shares		Weighted Average Grant Date Fair Value
Nonvested shares, December 31, 2014	373,886		$	41.58
Granted during the period	87,124		31.41
Vested during the period	(19,016	)	32.98
Nonvested shares, March 31, 2015	441,994		$	40.16
Nonvested shares, December 31, 2013	306,524		$	22.75
Granted during the period	27,183		50.80
Vested during the period	(92,000	)	17.92
Nonvested shares, March 31, 2014	241,707		$	27.75

Schedule of Vesting of Restricted Stock Award

At March 31, 2015, the future vesting schedule of the nonvested shares is as follows:

First year	110,675
Second year	127,348
Third year	111,307
Fourth year	58,564
Fifth year	34,100
Total nonvested shares	441,994

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Assets at Fair Value on Recurring Basis

The following table represents assets reported on the consolidated balance sheets at their fair value on a recurring basis as of March 31, 2015 and December 31, 2014 by level within the ASC Topic 820 fair value measurement hierarchy:

			Fair Value Measurements at Reporting Date Using
	Assets/ Liabilities Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2015
Measured on a recurring basis:
Assets:
Investment securities available for sale:
U.S. treasuries	$	1,008	$	—	$	1,008	$	—
Government agency securities	54,289		—		54,289		—
Obligations of state and municipal subdivisions	75,407		—		75,407		—
Corporate bonds	1,098		—		1,098		—
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	66,347		—		66,347		—
December 31, 2014
Measured on a recurring basis:
Assets:
Investment securities available for sale:
U.S. treasuries	$	1,006	$	—	$	1,006	$	—
Government agency securities	58,023		—		58,023		—
Obligations of state and municipal subdivisions	76,899		—		76,899		—
Corporate bonds	1,081		—		1,081		—
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	69,053		—		69,053		—

Assets and Liabilities at Fair Value on Nonrecurring Basis

The following table presents the assets carried on the consolidated balance sheet by caption and by level in the fair value hierarchy at March 31, 2015 and December 31, 2014, for which a nonrecurring change in fair value has been recorded:

			Fair Value Measurements at Reporting Date Using
	Assets Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Period Ended Total (Gains) Losses
March 31, 2015
Measured on a nonrecurring basis:
Assets:
Impaired loans	$	4,203	$	—	$	—	$	4,203	$	709
Other real estate	—		—		—		—		$	—
December 31, 2014
Measured on a nonrecurring basis:
Assets:
Impaired loans	$	4,943	$	—	$	—	$	4,943	$	188
Other real estate	138		—		—		138		22

Carrying Amount and Estimated Fair Value of Financial Instruments

The carrying amount, estimated fair value and the level of the fair value hierarchy of the Company’s financial instruments were as follows at March 31, 2015 and December 31, 2014:

					Fair Value Measurements at Reporting Date Using
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2015
Financial assets:
Cash and cash equivalents	$	358,798	$	358,798	$	358,798	$	—	$	—
Securities available for sale	198,149		198,149		—		198,149		—
Loans held for sale	7,034		7,034		—		7,034		—
Loans, net	3,283,021		3,302,768		—		3,296,646		6,122
FHLB of Dallas stock and other restricted stock	12,333		12,333		—		12,333		—
Accrued interest receivable	9,111		9,111		—		9,111		—
Financial liabilities:
Deposits	3,386,678		3,388,747		—		3,388,747		—
Accrued interest payable	1,823		1,823		—		1,823		—
FHLB advances	219,386		219,556		—		219,556		—
Repurchase agreements	5,783		5,783		—		5,783		—
Other borrowings	72,105		74,686		—		74,686		—
Junior subordinated debentures	18,147		18,137		—		18,137		—
Off-balance sheet assets (liabilities):
Commitments to extend credit	—		—		—		—		—
Standby letters of credit	—		—		—		—		—
December 31, 2014
Financial assets:
Cash and cash equivalents	$	324,047	$	324,047	$	324,047	$	—	$	—
Securities available for sale	206,062		206,062		—		206,062		—
Loans held for sale	4,453		4,453		—		4,453		—
Loans, net	3,182,045		3,203,337		—		3,200,261		3,076
FHLB of Dallas stock and other restricted stock	12,321		12,321		—		12,321		—
Accrued interest receivable	9,655		9,655		—		9,655		—
Financial liabilities:
Deposits	3,249,598		3,252,114		—		3,252,114		—
Accrued interest payable	2,919		2,919		—		2,919		—
FHLB advances	229,405		228,607		—		228,607		—
Repurchase agreements	4,012		4,012		—		4,012		—
Other borrowings	72,730		75,164		—		75,164		—
Junior subordinated debentures	18,147		18,134		—		18,134		—
Off-balance sheet assets (liabilities):
Commitments to extend credit	—		—		—		—		—
Standby letters of credit	—		—		—		—		—

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Income Taxes - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate (percent)	35.00%

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Loans, Net and Allowance for Loan Losses - Summary of Non Performing Loans by Loan Class (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Non Performing Loans [Line Items]
Nonaccrual loans	$ 6,632	$ 3,703
Loans past due 90 days and still accruing	0	451
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	7,029	5,960
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	13,661	10,114
Commercial
Non Performing Loans [Line Items]
Nonaccrual loans	5,873	1,449
Loans past due 90 days and still accruing	0	157
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	27	30
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	5,900	1,636
Commercial Real Estate, Land and Land Development
Non Performing Loans [Line Items]
Nonaccrual loans	57	70
Loans past due 90 days and still accruing	0	288
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	4,426	4,668
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	4,483	5,026
Residential Real Estate
Non Performing Loans [Line Items]
Nonaccrual loans	631	2,117
Loans past due 90 days and still accruing	0	0
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	2,571	1,254
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	3,202	3,371
Single-Family Interim Construction
Non Performing Loans [Line Items]
Nonaccrual loans	0	0
Loans past due 90 days and still accruing	0	0
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	0	0
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	0	0
Agricultural
Non Performing Loans [Line Items]
Nonaccrual loans	0	0
Loans past due 90 days and still accruing	0	0
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	0	0
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	0	0
Consumer
Non Performing Loans [Line Items]
Nonaccrual loans	71	67
Loans past due 90 days and still accruing	0	6
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	5	8
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	76	81
Other
Non Performing Loans [Line Items]
Nonaccrual loans	0	0
Loans past due 90 days and still accruing	0	0
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	0	0
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	$ 0	$ 0

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Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2015

Regulated Operations [Abstract]

Schedule of Compliance with Regulatory Capital Requirements

The actual capital amounts and ratios of the Company and Bank as of March 31, 2015 and December 31, 2014, are presented in the following table:

	Actual				Minimum for Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
March 31, 2015
Total capital to risk weighted assets:
Consolidated	$	412,795	11.88	%	$	277,924	8.00	%	N/A		N/A
Bank	406,452		11.71		277,597		8.00		$	346,996	10.00	%
Tier 1 capital to risk weighted assets:
Consolidated	323,305		9.31		208,443		6.00		N/A		N/A
Bank	386,225		11.13		208,198		6.00		277,597		8.00	%
Common equity tier 1 to risk weighted assets
Consolidated	299,367		8.62		156,333		4.50		N/A		N/A
Bank	386,225		11.13		156,148		4.50		225,547		6.50	%
Tier 1 capital to average assets:
Consolidated	323,305		7.78		166,160		4.00		N/A		N/A
Bank	386,225		9.93		155,549		4.00		194,436		5.00	%
December 31, 2014
Total capital to risk weighted assets:
Consolidated	$	402,326	12.59	%	$	255,633	8.00	%	N/A		N/A
Bank	397,512		12.46		255,219		8.00		$	319,024	10.00	%
Tier 1 capital to risk weighted assets:
Consolidated	314,136		9.83		127,817		4.00		N/A		N/A
Bank	378,960		11.88		127,609		4.00		191,414		6.00	%
Tier 1 capital to average assets:
Consolidated	314,136		8.15		154,270		4.00		N/A		N/A
Bank	378,960		9.93		152,598		4.00		190,747		5.00	%

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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015 segment
Accounting Policies [Abstract]
Number of reportable segments (segment)	1

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 9,452	$ 4,801
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	1,521	1,145
Amortization of core deposit intangibles	372	199
Amortization of premium on securities, net	426	394
Stock based compensation expense	1,097	390
FHLB stock dividends	(12)	(9)
Gain recognized on other real estate transactions	(130)	(39)
Deferred tax (benefit) expense	(599)	173
Provision for loan losses	1,670	1,253
Increase in cash surrender value of life insurance	(270)	(149)
Loans originated for sale	(55,984)	(28,070)
Proceeds from sale of loans	53,403	29,262
Net change in other assets	6,446	1,012
Net change in other liabilities	(13,081)	(3,326)
Net cash provided by operating activities	4,311	7,036
Cash flows from investing activities:
Proceeds from maturities, calls and pay downs of securities available for sale	8,868	20,941
Purchases of securities available for sale	0	(8,667)
Net purchases of FHLB stock	0	491
Net loans originated	(102,646)	(99,556)
Additions to premises and equipment	(2,782)	(282)
Proceeds from sale of premises and equipment	0	11
Proceeds from sale of other real estate owned	316	552
Capitalized additions to other real estate	(10)	(28)
Cash received from acquired banks	0	32,246
Cash paid in connection with acquisitions	0	(10,000)
Net cash used in investing activities	(96,254)	(64,292)
Cash flows from financing activities:
Net increase in demand deposits, NOW and savings accounts	98,901	26,181
Net increase in time deposits	38,179	48,712
Net change in FHLB advances	(10,019)	(13,022)
Net change in repurchase agreements	1,771	802
Repayments of other borrowings	(625)	0
Offering costs paid in connection with acquired banks	(144)	0
Dividends paid	(1,369)	(756)
Net cash provided by financing activities	126,694	61,917
Net change in cash and cash equivalents	34,751	4,661
Cash and cash equivalents at beginning of year	324,047	93,054
Cash and cash equivalents at end of period	$ 358,798	$ 97,715

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Summary of Significant Accounting Policies-EPS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Net income	$ 9,452	$ 4,801
Less: Preferred stock dividends	(60)	0
Net income after preferred stock dividends	9,392	4,801
Undistributed earnings allocated to participating securities	178	58
Dividends paid on participating securities	30	11
Net income available to common shareholders	$ 9,184	$ 4,732
Weighted-average basic shares outstanding (shares)	16,712,527	12,403,387
Basic earnings per share (usd per share)	$ 0.55	$ 0.38
Add dilutive stock warrants (shares)	77,933	101,643
Total weighted-average diluted shares outstanding (shares)	16,790,460	12,505,030
Diluted earnings per share (usd per share)	$ 0.55	$ 0.38
Anti-dilutive participating securities (shares)	19,705	109,040

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Loans, Net and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015 component	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Loans, net	$ 3,283,021,000	$ 3,182,045,000
Period of operating lines	1 year
Number of components allowance for loan losses is derived from	2
Recorded investment in troubled debt restructuring including nonaccraul	7,045,000	7,302,000
Minimum
Accounts Notes And Loans Receivable [Line Items]
Loans requiring external review	2,400,000
Commercial, E&P Energy Loans Receivable
Accounts Notes And Loans Receivable [Line Items]
Loans, net	$ 239,000,000	$ 231,700,000
Agricultural
Accounts Notes And Loans Receivable [Line Items]
Loan to value ratio (percent)	80.00%
Loan, amortization period	20 years
Consumer
Accounts Notes And Loans Receivable [Line Items]
Percentage of total loan portfolio (percent) (less than)	2.00%

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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 483	$ 198
Purchase agreement	8,800
Payments for aircraft	2,000
Remaining purchase obligation	$ 6,800

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 136,525	$ 153,158
Interest-bearing deposits in other banks	222,273	170,889
Cash and cash equivalents	358,798	324,047
Securities available for sale (amortized cost of $193,983 and $203,277, respectively)	198,149	206,062
Loans held for sale	7,034	4,453
Loans, net of allowance for loan losses of $20,227 and $18,552, respectively	3,283,021	3,182,045
Premises and equipment, net	88,163	88,902
Other real estate owned	4,587	4,763
Federal Home Loan Bank (FHLB) of Dallas stock and other restricted stock	12,333	12,321
Bank-owned life insurance (BOLI)	40,054	39,784
Deferred tax asset	2,351	2,235
Goodwill	229,639	229,457
Core deposit intangible, net	12,083	12,455
Other assets	22,152	26,115
Total assets	4,258,364	4,132,639
Deposits:
Noninterest-bearing	806,912	818,022
Interest-bearing	2,579,766	2,431,576
Total deposits	3,386,678	3,249,598
FHLB advances	219,386	229,405
Repurchase agreements	5,783	4,012
Other borrowings	68,785	69,410
Other borrowings, related parties	3,320	3,320
Junior subordinated debentures	18,147	18,147
Other liabilities	5,537	17,896
Total liabilities	3,707,636	3,591,788
Commitments and contingencies
Stockholders’ equity:
Series A preferred stock (23,938.35 shares issued and outsanding)	23,938	23,938
Common stock (17,119,793 and 17,032,669 shares outstanding, respectively)	171	170
Additional paid-in capital	477,564	476,609
Retained earnings	45,754	37,731
Accumulated other comprehensive income	3,301	2,403
Total stockholders’ equity	550,728	540,851
Total liabilities and stockholders’ equity	$ 4,258,364	$ 4,132,639

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Loans, Net and Allowance for Loan Losses - Impaired Loans by Loan Class (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	$ 7,306		$ 3,551
Impaired loans with no allowance for loan losses	8,371		8,158
Total	15,677		11,709
Unpaid principal balance of impaired loans	16,364		12,454
Allowance for loan losses on impaired loans	1,184		475
Average recorded investment in impaired loans	13,694	11,519
Interest income recognized on impaired loans	143	138
Commercial
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	5,865		1,475
Impaired loans with no allowance for loan losses	35		4
Total	5,900		1,479
Unpaid principal balance of impaired loans	5,904		1,482
Allowance for loan losses on impaired loans	1,120		339
Average recorded investment in impaired loans	3,689	376
Interest income recognized on impaired loans	21	3
Commercial Real Estate, Land and Land Development
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	1,441		2,056
Impaired loans with no allowance for loan losses	5,044		4,712
Total	6,485		6,768
Unpaid principal balance of impaired loans	6,990		7,274
Allowance for loan losses on impaired loans	64		124
Average recorded investment in impaired loans	6,627	7,788
Interest income recognized on impaired loans	93	107
Residential Real Estate
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		13
Impaired loans with no allowance for loan losses	3,216		3,374
Total	3,216		3,387
Unpaid principal balance of impaired loans	3,375		3,605
Allowance for loan losses on impaired loans	0		8
Average recorded investment in impaired loans	3,302	3,207
Interest income recognized on impaired loans	29	28
Single-Family Interim Construction
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		0
Impaired loans with no allowance for loan losses	0		0
Total	0		0
Unpaid principal balance of impaired loans	0		0
Allowance for loan losses on impaired loans	0		0
Average recorded investment in impaired loans	0	85
Interest income recognized on impaired loans	0	0
Agricultural
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		0
Impaired loans with no allowance for loan losses	0		0
Total	0		0
Unpaid principal balance of impaired loans	0		0
Allowance for loan losses on impaired loans	0		0
Average recorded investment in impaired loans	0	0
Interest income recognized on impaired loans	0	0
Consumer
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		7
Impaired loans with no allowance for loan losses	76		68
Total	76		75
Unpaid principal balance of impaired loans	95		93
Allowance for loan losses on impaired loans	0		4
Average recorded investment in impaired loans	76	63
Interest income recognized on impaired loans	0	0
Other
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		0
Impaired loans with no allowance for loan losses	0		0
Total	0		0
Unpaid principal balance of impaired loans	0		0
Allowance for loan losses on impaired loans	0		0
Average recorded investment in impaired loans	0	0
Interest income recognized on impaired loans	$ 0	$ 0

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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Stock	Common Stock $.01 Par Value 100 million shares authorized	Additional Paid in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2013	$ 233,772	$ 0	$ 123	$ 222,116	$ 12,663	$ 0	$ (1,130)
Beginning balance (in shares) at Dec. 31, 2013			12,330,158
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,801				4,801
Other comprehensive income, net of tax	1,579						1,579
Stock issued (shares)			235,594
Stock issued	11,700		3	11,697
Restricted stock granted (shares)			27,183
Restricted stock granted	0		0	0
Stock based compensation expense	390			390
Excess tax benefit on restricted stock vested	1,022			1,022
Dividends ($0.08 per share in 2015 and $0.06 per share in 2014)	(756)				(756)
Ending balance at Mar. 31, 2014	252,508	0	126	235,225	16,708	0	449
Ending balance (in shares) at Mar. 31, 2014			12,592,935
Beginning balance at Dec. 31, 2014	540,851	23,938	170	476,609	37,731	0	2,403
Beginning balance (in shares) at Dec. 31, 2014			17,032,669
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,452				9,452
Other comprehensive income, net of tax	898						898
Offering costs related to acquired bank	(144)			(144)
Restricted stock granted (shares)			87,124
Restricted stock granted	0		1	(1)
Stock based compensation expense	1,097			1,097
Excess tax benefit on restricted stock vested	3			3
Preferred stock dividends	(60)				(60)
Dividends ($0.08 per share in 2015 and $0.06 per share in 2014)	(1,369)				(1,369)
Ending balance at Mar. 31, 2015	$ 550,728	$ 23,938	$ 171	$ 477,564	$ 45,754	$ 0	$ 3,301
Ending balance (in shares) at Mar. 31, 2015			17,119,793

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Fair Value Measurements-Carrying Amount and Estimated Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial assets:
Securities available for sale	$ 198,149	$ 206,062
Financial liabilities:
Repurchase agreements	5,783	4,012
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	573,275	574,452
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	358,798	324,047
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net	0	0
FHLB of Dallas stock and other restricted stock	0	0
Accrued interest receivable	0	0
Financial liabilities:
Deposits	0	0
Accrued interest payable	0	0
FHLB advances	0	0
Repurchase agreements	0	0
Other borrowings	0	0
Junior subordinated debentures	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale	198,149	206,062
Loans held for sale	7,034	4,453
Loans, net	3,296,646	3,200,261
FHLB of Dallas stock and other restricted stock	12,333	12,321
Accrued interest receivable	9,111	9,655
Financial liabilities:
Deposits	3,388,747	3,252,114
Accrued interest payable	1,823	2,919
FHLB advances	219,556	228,607
Repurchase agreements	5,783	4,012
Other borrowings	74,686	75,164
Junior subordinated debentures	18,137	18,134
Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net	6,122	3,076
FHLB of Dallas stock and other restricted stock	0	0
Accrued interest receivable	0	0
Financial liabilities:
Deposits	0	0
Accrued interest payable	0	0
FHLB advances	0	0
Repurchase agreements	0	0
Other borrowings	0	0
Junior subordinated debentures	0	0
Carrying Amount
Financial assets:
Cash and cash equivalents	358,798	324,047
Securities available for sale	198,149	206,062
Loans held for sale	7,034	4,453
Loans, net	3,283,021	3,182,045
FHLB of Dallas stock and other restricted stock	12,333	12,321
Accrued interest receivable	9,111	9,655
Financial liabilities:
Deposits	3,386,678	3,249,598
Accrued interest payable	1,823	2,919
FHLB advances	219,386	229,405
Repurchase agreements	5,783	4,012
Other borrowings	72,105	72,730
Junior subordinated debentures	18,147	18,147
Estimated Fair Value
Financial assets:
Cash and cash equivalents	358,798	324,047
Securities available for sale	198,149	206,062
Loans held for sale	7,034	4,453
Loans, net	3,302,768	3,203,337
FHLB of Dallas stock and other restricted stock	12,333	12,321
Accrued interest receivable	9,111	9,655
Financial liabilities:
Deposits	3,388,747	3,252,114
Accrued interest payable	1,823	2,919
FHLB advances	219,556	228,607
Repurchase agreements	5,783	4,012
Other borrowings	74,686	75,164
Junior subordinated debentures	18,137	18,134
Commitments to extend credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	566,165	565,881
Commitments to extend credit | Quoted Prices in Active Markets for Identical Assets (Level 1)
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Commitments to extend credit | Significant Other Observable Inputs (Level 2)
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Commitments to extend credit | Significant Unobservable Inputs (Level 3)
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Commitments to extend credit | Carrying Amount
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Commitments to extend credit | Estimated Fair Value
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Standby letters of credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	7,110	8,571
Standby letters of credit | Quoted Prices in Active Markets for Identical Assets (Level 1)
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Standby letters of credit | Significant Other Observable Inputs (Level 2)
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Standby letters of credit | Significant Unobservable Inputs (Level 3)
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Standby letters of credit | Carrying Amount
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Standby letters of credit | Estimated Fair Value
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	$ 0	$ 0

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Statement of Cash Flows - Measurement-Period Adjustments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Noncash assets acquired
Loans	$ 0	$ (328)
Goodwill	182	749
Core deposit intangibles	0	(18)
Deferred tax asset	0	109
Other assets	0	10
Total assets	182	522
Noncash liabilities assumed:
Deposits	0	505
Other liabilities	182	17
Total liabilities	$ 182	$ 522

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Subsequent Events (Details) (Subsequent Event, USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended
	May 01, 2015	Apr. 27, 2015
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (per share)	$ 0.08
Overstatement of risk weighted assets		$ 112
Understatement of common equity tier 1 capital risk weighted assets		0.27%
Understatement of tier one risk based capital to risk weighted assets		0.29%
Understatement capital to risk weighted assets		0.37%

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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Earning Per Share

	Three Months Ended March 31,
	2015			2014
Basic earnings per share:
Net income	$	9,452		$	4,801
Less: Preferred stock dividends	(60		)	—
Net income after preferred stock dividends	9,392			4,801
Less:
Undistributed earnings allocated to participating securities	178			58
Dividends paid on participating securities	30			11
Net income available to common shareholders	$	9,184		$	4,732
Weighted-average basic shares outstanding	16,712,527			12,403,387
Basic earnings per share	$	0.55		$	0.38
Diluted earnings per share:
Net income available to common shareholders	$	9,184		$	4,732
Total weighted-average basic shares outstanding	16,712,527			12,403,387
Add dilutive stock warrants	77,933			101,643
Total weighted-average diluted shares outstanding	16,790,460			12,505,030
Diluted earnings per share	$	0.55		$	0.38
Anti-dilutive participating securities	19,705			109,040

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Securities Available for Sale - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Carrying value of securities pledged	$ 141,091	$ 174,741

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Securities Available for Sale (Tables)

3 Months Ended

Mar. 31, 2015

Available-for-sale Securities [Abstract]

Amortized Cost of Securities and Approximate Fair Values

The amortized cost of securities and their approximate fair values at March 31, 2015 and December 31, 2014, are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Securities Available for Sale
March 31, 2015:
U.S. treasuries	$	999	$	9	$	—		$	1,008
Government agency securities	53,964		446		(121		)	54,289
Obligations of state and municipal subdivisions	73,587		2,121		(301		)	75,407
Corporate bonds	1,066		32		—			1,098
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	64,367		1,981		(1		)	66,347
	$	193,983	$	4,589	$	(423	)	$	198,149
December 31, 2014:
U.S. treasuries	$	999	$	7	$	—		$	1,006
Government agency securities	58,174		199		(350		)	58,023
Obligations of state and municipal subdivisions	75,599		1,837		(537		)	76,899
Corporate bonds	1,068		13		—			1,081
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	67,437		1,616		—			69,053
	$	203,277	$	3,672	$	(887	)	$	206,062

Amortized Cost and Estimated Fair Value of Securities Available for Sale by Contractual Maturity

The amortized cost and estimated fair value of securities available for sale at March 31, 2015, by contractual maturity, are shown below. Maturities of pass-through certificates will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.   

	March 31, 2015
	Securities Available for Sale
	Amortized Cost		Fair Value
Due in one year or less	$	2,801	$	2,803
Due from one year to five years	49,616		49,743
Due from five to ten years	36,768		37,433
Thereafter	40,431		41,823
	129,616		131,802
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	64,367		66,347
	$	193,983	$	198,149

Summary of Unrealized Losses and Fair Value Securities in Continuous Unrealized Loss Position

The number of securities, unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of March 31, 2015 and December 31, 2014, are summarized as follows:   

	Less Than 12 Months						Greater Than 12 Months						Total
Description of Securities	Number of Securities	Estimated Fair Value		Unrealized Losses			Number of Securities	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
Securities Available for Sale
March 31, 2015
Government agency securities	—	$	—	$	—		12	$	20,877	$	(121	)	$	20,877	$	(121	)
Obligations of state and municipal subdivisions	9	3,597		(11		)	25	11,990		(290		)	15,587		(301		)
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	1	93		(1		)	—	—		—			93		(1		)
	10	$	3,690	$	(12	)	37	$	32,867	$	(411	)	$	36,557	$	(423	)
December 31, 2014
Government agency securities	6	$	6,396	$	(24	)	14	$	22,671	$	(326	)	$	29,067	$	(350	)
Obligations of state and municipal subdivisions	44	16,636		(197		)	13	8,541		(340		)	25,177		(537		)
	50	$	23,032	$	(221	)	27	$	31,212	$	(666	)	$	54,244	$	(887	)

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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends paid (usd per share)	$ 0.08	$ 0.06
Common stock par value (in usd per share)	$ 0.01	$ 0.01
Common stock shares authorized	100,000,000	100,000,000
Preferred stock par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock shares authorized	10,000,000	10,000,000

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Amortized cost of securities available for sale	$ 193,983	$ 203,277
Allowance for loan losses	$ 20,227	$ 18,552
Preferred stock, shares issued (in shares)	23,938.35	0
Preferred stock, shares outstanding (in shares)	23,938.35	0
Common stock, shares outstanding (shares)	17,119,793	17,032,669

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Stock Awards and Stock Warrants

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Awards and Stock Warrants

Stock Awards and Stock Warrants

The Company grants common stock awards to certain employees of the Company. The common stock issued prior to 2013 vests five years from the date the award is granted and the related compensation expense is recognized over the vesting period. In connection with the initial public offering in April 2013, the Board of Directors adopted a new 2013 Equity Incentive Plan. Under this plan, the Compensation Committee may grant awards in the form of restricted stock, restricted stock rights, restricted stock units, qualified and nonqualified stock options, performance-based share awards and other equity-based awards. The Plan reserved 800,000 shares of common stock to be awarded by the Company’s compensation committee. The shares currently issued under the 2013 Plan are restricted and will vest evenly over the required employment period, generally ranging from three to five years. Shares granted under a previous plan prior to 2012 and those in and subsequent to 2013 under the 2013 Equity Incentive Plan were issued at the date of grant and receive dividends. Shares issued under a revised plan in 2012 are not outstanding shares of the Company until they vest and do not receive dividends.

The following table summarizes the activity in nonvested shares for the three months ended March 31, 2015 and 2014:

	Number of Shares		Weighted Average Grant Date Fair Value
Nonvested shares, December 31, 2014	373,886		$	41.58
Granted during the period	87,124		31.41
Vested during the period	(19,016	)	32.98
Nonvested shares, March 31, 2015	441,994		$	40.16
Nonvested shares, December 31, 2013	306,524		$	22.75
Granted during the period	27,183		50.80
Vested during the period	(92,000	)	17.92
Nonvested shares, March 31, 2014	241,707		$	27.75

Compensation expense related to these awards is recorded based on the fair value of the award at the date of grant and totaled $1,097 and $390 for the three months ended March 31, 2015 and 2014, respectively. Compensation expense is recorded in salaries and employee benefits in the accompanying consolidated statements of income. At March 31, 2015, future compensation expense is estimated to be $13,650 and will be recognized over a remaining weighted average period of 3.33 years.

The fair value of common stock awards that vested during the three months ended March 31, 2015 and 2014 was $678 and $4,869, respectively. The Company has recorded $3 and $1,022 to additional paid in capital, which represents the excess tax benefit recognized on the vested shares for the three months ended March 31, 2015 and 2014, respectively.

At March 31, 2015, the future vesting schedule of the nonvested shares is as follows:

First year	110,675
Second year	127,348
Third year	111,307
Fourth year	58,564
Fifth year	34,100
Total nonvested shares	441,994

The Company has warrants outstanding representing the right to purchase 150,544 shares of Company stock at $17.19 per share to certain Company directors and shareholders. The warrants were issued in return for the shareholders' agreement to repurchase the subordinated debt outstanding to an unaffiliated bank in the event of Company default. The subordinated debt was paid off by the Company in 2013. The warrants expire in December 2018.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	IBTX
Entity Registrant Name	Independent Bank Group, Inc.
Entity Central Index Key	0001564618
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		17,119,376

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Regulatory Matters

3 Months Ended

Mar. 31, 2015

Regulated Operations [Abstract]

Regulatory Matters

Regulatory Matters

Under banking law, there are legal restrictions limiting the amount of dividends the Bank can declare. Approval of the regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of the Bank to fall below specified minimum levels. For state banks, subject to regulatory capital requirements, payment of dividends is generally allowed to the extent of net profits.

The Company (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by 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 guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of 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.

In July 2013, the Federal Reserve published final rules for the adoption of the Basel III regulatory capital framework (the "Basel III Capital Rules"). The Basel III Capital Rules, among other things, (i) introduce a new capital measure called "Common Equity Tier 1" ("CET1"), (ii) specify that Tier 1 capital consist of Common Equity Tier 1 and "Additional Tier 1 Capital" instruments meeting specified requirements, (iii) define Common Equity Tier 1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to Common Equity Tier 1 and not to the other components of capital and (iv) expand the scope of the deductions/adjustments as compared to existing regulations. The Basel III Capital Rules became effective for the Company on January 1, 2015 with certain transition provisions fully phased in on January 1, 2019.

Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total, CET1 and Tier 1 capital (as defined in the regulations) to risk weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). Management believes, as of March 31, 2015 and December 31, 2014, the Company and the Bank meet all capital adequacy requirements to which they are subject.

As of March 31, 2015 and December 31, 2014, the Bank’s capital ratios exceeded those levels necessary to be categorized as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized," the Bank must maintain minimum total risk based, CET1, Tier 1 risk based and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed the Bank’s category.

The actual capital amounts and ratios of the Company and Bank as of March 31, 2015 and December 31, 2014, are presented in the following table:

	Actual				Minimum for Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
March 31, 2015
Total capital to risk weighted assets:
Consolidated	$	412,795	11.88	%	$	277,924	8.00	%	N/A		N/A
Bank	406,452		11.71		277,597		8.00		$	346,996	10.00	%
Tier 1 capital to risk weighted assets:
Consolidated	323,305		9.31		208,443		6.00		N/A		N/A
Bank	386,225		11.13		208,198		6.00		277,597		8.00	%
Common equity tier 1 to risk weighted assets
Consolidated	299,367		8.62		156,333		4.50		N/A		N/A
Bank	386,225		11.13		156,148		4.50		225,547		6.50	%
Tier 1 capital to average assets:
Consolidated	323,305		7.78		166,160		4.00		N/A		N/A
Bank	386,225		9.93		155,549		4.00		194,436		5.00	%
December 31, 2014
Total capital to risk weighted assets:
Consolidated	$	402,326	12.59	%	$	255,633	8.00	%	N/A		N/A
Bank	397,512		12.46		255,219		8.00		$	319,024	10.00	%
Tier 1 capital to risk weighted assets:
Consolidated	314,136		9.83		127,817		4.00		N/A		N/A
Bank	378,960		11.88		127,609		4.00		191,414		6.00	%
Tier 1 capital to average assets:
Consolidated	314,136		8.15		154,270		4.00		N/A		N/A
Bank	378,960		9.93		152,598		4.00		190,747		5.00	%

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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Interest and fees on loans	$ 39,580	$ 24,123
Interest on taxable securities	609	699
Interest on nontaxable securities	414	257
Interest on federal funds sold and other	133	83
Total interest income	40,736	25,162
Interest expense:
Interest on deposits	2,709	1,907
Interest on FHLB advances	752	852
Interest on repurchase agreements and other borrowings	1,069	135
Interest on junior subordinated debentures	128	133
Total interest expense	4,658	3,027
Net interest income	36,078	22,135
Provision for loan losses	1,670	1,253
Net interest income after provision for loan losses	34,408	20,882
Noninterest income:
Service charges on deposit accounts	1,805	1,211
Mortgage fee income	1,300	730
Gain on sale of other real estate	130	39
Increase in cash surrender value of BOLI	270	149
Other	461	205
Total noninterest income	3,966	2,334
Noninterest expense:
Salaries and employee benefits	14,424	9,134
Occupancy	3,910	2,538
Data processing	688	496
FDIC assessment	519	304
Advertising and public relations	346	234
Communications	539	320
Net other real estate owned expenses (including taxes)	59	79
Operations of IBG Adriatica, net	0	23
Core deposit intangible amortization	372	199
Professional fees	490	368
Acquisition expense, including legal	472	476
Other	2,567	1,905
Total noninterest expense	24,386	16,076
Income before taxes	13,988	7,140
Income tax expense	4,536	2,339
Net income	$ 9,452	$ 4,801
Basic earnings per share (usd per share)	$ 0.55	$ 0.38
Diluted earnings per share (usd per share)	$ 0.55	$ 0.38

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Loans, Net and Allowance for Loan Losses

3 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Loans, Net and Allowance for Loan Losses

Loans, Net and Allowance for Loan Losses

Loans, net at March 31, 2015 and December 31, 2014, consisted of the following:

	March 31,			December 31,
	2015			2014
Commercial	$	697,449		$	672,052
Real estate:
Commercial	1,555,462			1,450,434
Commercial construction, land and land development	301,944			334,964
Residential	515,716			514,025
Single family interim construction	148,202			138,278
Agricultural	37,650			38,822
Consumer	47,387			52,267
Other	139			242
	3,303,949			3,201,084
Deferred loan fees	(701		)	(487		)
Allowance for loan losses	(20,227		)	(18,552		)
	$	3,283,021		$	3,182,045

The Company has certain lending policies and procedures in place that are designed to maximize loan income within an acceptable level of risk. Management reviews and approves these policies and procedures on a regular basis. A reporting system supplements the review process by providing management with frequent reports related to loan production, loan quality, concentrations of credit, loan delinquencies and non-performing and potential problem loans.

Commercial loans are underwritten after evaluating and understanding the borrower’s ability to operate profitably and prudently expand its business. The Company’s management examines current and projected cash flows to determine the ability of the borrower to repay their obligations as agreed. Commercial loans are primarily made based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. These cash flows, however, may not be as expected and the value of collateral securing the loans may fluctuate. Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee; however, some short term loans may be made on an unsecured basis. Additionally, our commercial loan portfolio includes loans made to customers in the energy industry, which is a complex, technical and cyclical industry. Experienced bankers with specialized energy lending experience originate our energy loans. Companies in this industry produce, extract, develop, exploit and explore for oil and natural gas. Loans are primarily collateralized with proven producing oil and gas reserves based on a technical evaluation of these reserves. At March 31, 2015 and December 31, 2014, there were approximately $239.0 million and $231.7 million of exploration and production (E&P) energy loans outstanding, respectively.

Commercial real estate loans are subject to underwriting standards and processes similar to commercial loans. These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate lending typically involves higher loan principal amounts, and the repayment of these loans is generally largely dependent on the successful operation of the property or the business conducted on the property securing the loan. Commercial real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. The properties securing the Company’s commercial real estate portfolio are diverse in terms of type and geographic location. Management monitors the diversification of the portfolio on a quarterly basis by type and geographic location. Management also tracks the level of owner occupied property versus non owner occupied property.

Land and commercial land development loans are underwritten using feasibility studies, independent appraisal reviews and financial analysis of the developers or property owners. Generally, borrowers must have a proven track record of success. Commercial construction loans are generally based upon estimates of cost and value of the completed project. These estimates may not be accurate. Commercial construction loans often involve the disbursement of substantial funds with the repayment dependent on the success of the ultimate project. Sources of repayment for these loans may be pre-committed permanent financing or sale of the developed property. The loans in this portfolio are geographically diverse and due to the increased risk are monitored closely by management and the board of directors on a quarterly basis.

Residential real estate and single family interim construction loans are underwritten primarily based on borrowers’ credit scores, documented income and minimum collateral values. Relatively small loan amounts are spread across many individual borrowers, which minimizes risk in the residential portfolio. In addition, management evaluates trends in past dues and current economic factors on a regular basis.

Agricultural loans are collateralized by real estate and/or agricultural-related assets. Agricultural real estate loans are primarily comprised of loans for the purchase of farmland. Loan-to-value ratios on loans secured by farmland generally do not exceed 80% and have amortization periods limited to twenty years. Agricultural non-real estate loans are generally comprised of term loans to fund the purchase of equipment, livestock and seasonal operating lines to grain farmers to plant and harvest corn and soybeans. Specific underwriting standards have been established for agricultural-related loans, including the establishment of projections for each operating year based on industry developed estimates of farm input costs and expected commodity yields and prices. Operating lines are typically written for one year and secured by the crop and other farm assets as considered necessary.

Agricultural loans carry significant credit risks as they involve larger balances concentrated with single borrowers or groups of related borrowers. In addition, repayment of such loans depends on the successful operation or management of the farm property securing the loan or for which an operating loan is utilized. Farming operations may be affected by adverse weather conditions such as drought, hail or floods that can severely limit crop yields.

Consumer loans represent less than 2% of the outstanding total loan portfolio. Collateral consists primarily of automobiles and other personal assets. Credit score analysis is used to supplement the underwriting process.

Most of the Company’s lending activity occurs within the State of Texas, primarily in the north, central and southeast Texas regions. A large percentage of the Company’s portfolio consists of commercial and residential real estate loans. As of March 31, 2015 and December 31, 2014, there were no concentrations of loans related to a single industry in excess of 10% of total loans.

The allowance for loan losses is an amount that management believes will be adequate to absorb estimated losses relating to specifically identified loans, as well as probable credit losses inherent in the balance of the loan portfolio.

The allowance is derived from the following two components: 1) allowances established on individual impaired loans, which are based on a review of the individual characteristics of each loan, including the customer’s ability to repay the loan, the underlying collateral values, and the industry in which the customer operates, and 2) allowances based on actual historical loss experience for the last three years for similar types of loans in the Company’s loan portfolio adjusted for primarily changes in the lending policies and procedures; collection, charge-off and recovery practices; nature and volume of the loan portfolio; volume and severity of nonperforming loans; existence and effect of any concentrations of credit and the level of such concentrations and current, national and local economic and business conditions. This second component also includes an unallocated allowance to cover uncertainties that could affect management’s estimate of probable losses. The unallocated allowance reflects the imprecision inherent in the underlying assumptions used in the methodologies for estimating this component.

The Company’s management continually evaluates the allowance for loan losses determined from the allowances established on individual loans and the amounts determined from historical loss percentages adjusted for the qualitative factors above. Should any of the factors considered by management change, the Company’s estimate of loan losses could also change and would affect the level of future provision expense. While the calculation of the allowance for loan losses utilizes management’s best judgment and all the information available, the adequacy of the allowance for loan losses is dependent on a variety of factors beyond the Company’s control, including, among other things, the performance of the entire loan portfolio, the economy, changes in interest rates and the view of regulatory authorities towards loan classifications.

In addition, regulatory agencies, as an integral part of their examination process, periodically review the Bank’s allowance for loan losses, and may require the Bank to make additions to the allowance based on their judgment about information available to them at the time of their examinations.

Loans requiring an allocated loan loss provision are generally identified at the servicing officer level based on review of weekly past due reports and/or the loan officer’s communication with borrowers. In addition, past due loans are discussed at weekly officer loan committee meetings to determine if classification is warranted. The Company’s credit department has implemented an internal risk based loan review process to identity potential internally classified loans that supplements the annual independent external loan review. The external review generally covers all loans greater than $2.4 million. These reviews include analysis of borrower’s financial condition, payment histories and collateral values to determine if a loan should be internally classified. Generally, once classified, an impaired loan analysis is completed by the credit department to determine if the loan is impaired and the amount of allocated allowance required.

The Texas economy, specifically the Company’s lending area of north, central and southeast Texas, has generally performed better than certain other parts of the country. However, the recent drop in oil prices has the potential to have negative impact on the Texas economy. The risk of loss associated with all segments of the portfolio could increase due to this impact.

The economy and other risk factors are minimized by the Company’s underwriting standards, which include the following principles: 1) financial strength of the borrower including strong earnings, high net worth, significant liquidity and acceptable debt to worth ratio, 2) managerial business competence, 3) ability to repay, 4) loan to value, 5) projected cash flow and 6) guarantor financial statements as applicable. The following is a summary of the activity in the allowance for loan losses by loan class for the three months ended March 31, 2015 and 2014:

	Commercial			Commercial Real Estate, Land and Land Development			Residential Real Estate			Single-Family Interim Construction			Agricultural			Consumer			Other		Unallocated		Total
Three months ended March 31, 2015
Balance at the beginning of period	$	5,051		$	10,110		$	2,205		$	669		$	246		$	146		$	—	$	125	$	18,552
Provision for loan losses	1,023			526			(13		)	65			(8		)	29			—		48		1,670
Charge-offs	—			—			—			—			—			(36		)	—		—		(36		)
Recoveries	4			18			2			—			—			17			—		—		41
Balance at end of period	$	6,078		$	10,654		$	2,194		$	734		$	238		$	156		$	—	$	173	$	20,227
Three months ended March 31, 2014
Balance at the beginning of period	$	2,401		$	7,872		$	2,440		$	577		$	238		$	363		$	—	$	69	$	13,960
Provision for loan losses	578			256			(163		)	(42		)	6			(6		)	—		624		1,253
Charge-offs	(363		)	(21		)	(1		)	—			—			(14		)	—		—		(399		)
Recoveries	4			10			2			1			—			10			—		—		27
Balance at end of period	$	2,620		$	8,117		$	2,278		$	536		$	244		$	353		$	—	$	693	$	14,841

The following table details the amount of the allowance for loan losses and recorded investment in loans by class as of March 31, 2015 and December 31, 2014:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Unallocated		Total
March 31, 2015
Allowance for losses:
Individually evaluated for impairment	$	1,120	$	64	$	—	$	—	$	—	$	—	$	—	$	—	$	1,184
Collectively evaluated for impairment	4,958		10,590		2,194		734		238		156		—		173		19,043
Loans acquired with deteriorated credit quality	—		—		—		—		—		—		—		—		—
Ending balance	$	6,078	$	10,654	$	2,194	$	734	$	238	$	156	$	—	$	173	$	20,227
Loans:
Individually evaluated for impairment	$	5,899	$	6,486	$	3,216	$	—	$	—	$	76	$	—	$	—	$	15,677
Collectively evaluated for impairment	688,120		1,801,261		510,777		148,202		37,650		47,286		139		—		3,233,435
Acquired with deteriorated credit quality	3,430		49,659		1,723		—		—		25		—		—		54,837
Ending balance	$	697,449	$	1,857,406	$	515,716	$	148,202	$	37,650	$	47,387	$	139	$	—	$	3,303,949
December 31, 2014
Allowance for losses:
Individually evaluated for impairment	$	339	$	124	$	8	$	—	$	—	$	4	$	—	$	—	$	475
Collectively evaluated for impairment	4,712		9,986		2,197		669		246		142		—		125		18,077
Loans acquired with deteriorated credit quality	—		—		—		—		—		—		—		—		—
Ending balance	$	5,051	$	10,110	$	2,205	$	669	$	246	$	146	$	—	$	125	$	18,552
Loans:
Individually evaluated for impairment	$	1,479	$	6,768	$	3,387	$	—	$	—	$	75	$	—	$	—	$	11,709
Collectively evaluated for impairment	666,830		1,724,514		508,833		138,278		38,822		52,159		242		—		3,129,678
Acquired with deteriorated credit quality	3,743		54,116		1,805		—		—		33		—		—		59,697
Ending balance	$	672,052	$	1,785,398	$	514,025	$	138,278	$	38,822	$	52,267	$	242	$	—	$	3,201,084

Nonperforming loans by loan class at March 31, 2015 and December 31, 2014, are summarized as follows:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
March 31, 2015
Nonaccrual loans	$	5,873	$	57	$	631	$	—	$	—	$	71	$	—	$	6,632
Loans past due 90 days and still accruing	—		—		—		—		—		—		—		—
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	27		4,426		2,571		—		—		5		—		7,029
	$	5,900	$	4,483	$	3,202	$	—	$	—	$	76	$	—	$	13,661
December 31, 2014
Nonaccrual loans	$	1,449	$	70	$	2,117	$	—	$	—	$	67	$	—	$	3,703
Loans past due 90 days and still accruing	157		288		—		—		—		6		—		451
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	30		4,668		1,254		—		—		8		—		5,960
	$	1,636	$	5,026	$	3,371	$	—	$	—	$	81	$	—	$	10,114

The accrual of interest is discontinued on a loan when management believes after considering collection efforts and other factors that the borrower's financial condition is such that collection of interest is doubtful. All interest accrued but not collected for loans that are placed on nonaccrual status or charged-off is reversed against interest income. Cash collections on nonaccrual loans are generally credited to the loan receivable balance, and no interest income is recognized on those loans until the principal balance has been collected. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Impaired loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. The Company has identified these loans through its normal loan review procedures. Impaired loans are measured based on 1) the present value of expected future cash flows discounted at the loans effective interest rate; 2) the loan's observable market price; or 3) the fair value of collateral if the loan is collateral dependent. Substantially all of the Company’s impaired loans are measured at the fair value of the collateral. In limited cases, the Company may use the other methods to determine the level of impairment of a loan if such loan is not collateral dependent.

All commercial, real estate, agricultural loans and troubled debt restructurings are considered for individual impairment analysis. Smaller balance consumer loans are collectively evaluated for impairment.

Impaired loans by loan class at March 31, 2015 and December 31, 2014, are summarized as follows:

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
March 31, 2015
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	$	5,865	$	1,441	$	—	$	—	$	—	$	—	$	—	$	7,306
Impaired loans with no allowance for loan losses	35		5,044		3,216		—		—		76		—		8,371
Total	$	5,900	$	6,485	$	3,216	$	—	$	—	$	76	$	—	$	15,677
Unpaid principal balance of impaired loans	$	5,904	$	6,990	$	3,375	$	—	$	—	$	95	$	—	$	16,364
Allowance for loan losses on impaired loans	$	1,120	$	64	$	—	$	—	$	—	$	—	$	—	$	1,184
December 31, 2014
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	$	1,475	$	2,056	$	13	$	—	$	—	$	7	$	—	$	3,551
Impaired loans with no allowance for loan losses	4		4,712		3,374		—		—		68		—		8,158
Total	$	1,479	$	6,768	$	3,387	$	—	$	—	$	75	$	—	$	11,709
Unpaid principal balance of impaired loans	$	1,482	$	7,274	$	3,605	$	—	$	—	$	93	$	—	$	12,454
Allowance for loan losses on impaired loans	$	339	$	124	$	8	$	—	$	—	$	4	$	—	$	475
For the three months ended March 31, 2015
Average recorded investment in impaired loans	$	3,689	$	6,627	$	3,302	$	—	$	—	$	76	$	—	$	13,694
Interest income recognized on impaired loans	$	21	$	93	$	29	$	—	$	—	$	—	$	—	$	143
For the three months ended March 31, 2014
Average recorded investment in impaired loans	$	376	$	7,788	$	3,207	$	85	$	—	$	63	$	—	$	11,519
Interest income recognized on impaired loans	$	3	$	107	$	28	$	—	$	—	$	—	$	—	$	138

Certain impaired loans have adequate collateral and do not require a related allowance for loan loss.

The Company will charge off that portion of any loan which management considers a loss. Commercial and real estate loans are generally considered for charge-off when exposure beyond collateral coverage is apparent and when no further collection of the loss portion is anticipated based on the borrower’s financial condition.

The restructuring of a loan is considered a “troubled debt restructuring” if both 1) the borrower is experiencing financial difficulties and 2) the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, principal forgiveness, extending amortization and other actions intended to minimize potential losses.

A “troubled debt restructured” loan is identified as impaired and measured for credit impairment as of each reporting period in accordance with the guidance in  Accounting Standards Codification (ASC) 310-10-35. The recorded investment in troubled debt restructurings, including those on nonaccrual, was $7,045 and $7,302 as of March 31, 2015 and December 31, 2014.

Following is a summary of loans modified under troubled debt restructurings during the three months ended March 31, 2015 and 2014:

.

	Commercial		Commercial Real Estate, Land and Land Development		Residential Real Estate		Single-Family Interim Construction		Agricultural		Consumer		Other		Total
Troubled debt restructurings during the three months ended March 31, 2015
Number of contracts	—		—		—		—		—		—		—		—
Pre-restructuring outstanding recorded investment	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Post-restructuring outstanding recorded investment	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Troubled debt restructurings during the three months ended March 31, 2014
Number of contracts	—		1		—		—		—		—		—		1
Pre-restructuring outstanding recorded investment	$	—	$	700	$	—	$	—	$	—	$	—	$	—	$	700
Post-restructuring outstanding recorded investment	$	—	$	700	$	—	$	—	$	—	$	—	$	—	$	700

At March 31, 2015 and 2014, there were no loans modified under troubled debt restructurings during the previous twelve month period that subsequently defaulted during the three months ended March 31, 2015 and 2014, respectively. At March 31, 2015 and 2014, the Company had no commitments to lend additional funds to any borrowers with loans whose terms have been modified under troubled debt restructurings.

Modifications primarily relate to extending the amortization periods of the loans and interest rate concessions. The majority of these loans were identified as impaired prior to restructuring; therefore, the modifications did not materially impact the Company’s determination of the allowance for loan losses.

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. The following table presents information regarding the aging of past due loans by loan class as of March 31, 2015 and December 31, 2014:

	Loans 30-89 Days Past Due		Loans 90 or More Past Due		Total Past Due Loans		Current Loans		Total Loans
March 31, 2015
Commercial	$	244	$	5,838	$	6,082	$	691,367	$	697,449
Commercial real estate, land and land  development	86		—		86		1,857,320		1,857,406
Residential real estate	1,087		404		1,491		514,225		515,716
Single-family interim construction	—		—		—		148,202		148,202
Agricultural	—		—		—		37,650		37,650
Consumer	1,363		11		1,374		46,013		47,387
Other	—		—		—		139		139
	$	2,780	$	6,253	$	9,033	$	3,294,916	$	3,303,949
December 31, 2014
Commercial	$	6,006	$	157	$	6,163	$	665,889	$	672,052
Commercial real estate, land and land  development	973		288		1,261		1,784,137		1,785,398
Residential real estate	1,258		554		1,812		512,213		514,025
Single-family interim construction	410		—		410		137,868		138,278
Agricultural	—		—		—		38,822		38,822
Consumer	1,899		8		1,907		50,360		52,267
Other	—		—		—		242		242
	$	10,546	$	1,007	$	11,553	$	3,189,531	$	3,201,084

The Company’s internal classified report is segregated into the following categories: 1) Pass/Watch, 2) Other Assets Especially Mentioned (OAEM), 3) Substandard and 4) Doubtful. The loans placed in the Pass/Watch category reflect the Company’s opinion that the loans reflect potential weakness that requires monitoring on a more frequent basis. The loans in the OAEM category reflect the Company’s opinion that the credit contains weaknesses which represent a greater degree of risk and warrant extra attention. These loans are reviewed monthly by officers and senior management to determine if a change in category is warranted. The loans placed in the Substandard category are considered to be potentially inadequately protected by the current debt service capacity of the borrower and/or the pledged collateral. These credits, even if apparently protected by collateral value, have shown weakness related to adverse financial, managerial, economic, market or political conditions, which may jeopardize repayment of principal and interest. There is possibility that some future loss could be sustained by the Company if such weakness is not corrected. The Doubtful category includes loans that are in default or principal exposure is probable. Substandard and Doubtful loans are individually evaluated to determine if they should be classified as impaired and an allowance is allocated if deemed necessary under ASC 310-10.

The loans that are not impaired are included with the remaining “pass” credits in determining the portion of the allowance for loan loss based on historical loss experience and other qualitative factors. The portfolio is segmented into categories including: commercial loans, consumer loans, commercial real estate loans, residential real estate loans and agricultural loans. The adjusted historical loss percentage is applied to each category. Each category is then added together to determine the allowance allocated under ASC 450-20.

A summary of loans by credit quality indicator by class as of March 31, 2015 and December 31, 2014, is as follows:

	Pass		Pass/ Watch		OAEM		Substandard		Doubtful		Total
March 31, 2015
Commercial	$	619,818	$	57,847	$	13,536	$	6,248	$	—	$	697,449
Commercial real estate, construction, land  and land development	1,832,284		8,626		5,962		10,534		—		1,857,406
Residential real estate	507,953		2,155		190		5,418		—		515,716
Single-family interim construction	148,202		—		—		—		—		148,202
Agricultural	37,595		55		—		—		—		37,650
Consumer	47,188		35		45		119		—		47,387
Other	139		—		—		—		—		139
	$	3,193,179	$	68,718	$	19,733	$	22,319	$	—	$	3,303,949
December 31, 2014
Commercial	$	647,894	$	16,919	$	977	$	6,262	$	—	$	672,052
Commercial real estate, construction, land  and land development	1,759,533		8,667		6,008		11,190		—		1,785,398
Residential real estate	505,920		2,188		325		5,592		—		514,025
Single-family interim construction	138,278		—		—		—		—		138,278
Agricultural	38,422		57		—		343		—		38,822
Consumer	52,055		39		50		123		—		52,267
Other	242		—		—		—		—		242
	$	3,142,344	$	27,870	$	7,360	$	23,510	$	—	$	3,201,084

The Company has acquired certain loans which experienced credit deterioration since origination (purchased credit impaired (PCI) loans). Accretion on PCI loans is based on estimated future cash flows, regardless of contractual maturity. There are no PCI loans outstanding for acquisitions prior to 2012. No additional PCI loans were acquired during the three months ended March 31, 2015.

The following table summarizes the outstanding balance and related carrying amount of purchased credit impaired loans by acquired bank as of the respective acquisition date for the acquisitions occurring in 2014:

	Acquisition Date
	October 1, 2014			April 15, 2014			January 1, 2014
	Houston City Bancshares, Inc.			BOH Holdings, Inc.			Live Oak Financial Corp.
Outstanding balance	$	12,021		$	55,718		$	3,583
Nonaccretable difference	(1,240		)	(5,798		)	(519		)
Accretable yield	(561		)	(2,579		)	(182		)
Carrying amount	$	10,220		$	47,341		$	2,882

The carrying amount of all acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at March 31, 2015 and December 31, 2014, were as follows:

	March 31, 2015		December 31, 2014
Outstanding balance	$	63,595	$	69,371
Carrying amount	54,837		59,697

There was no allocation established in the allowance for loan losses relating to PCI loans at March 31, 2015 or December 31, 2014.

The changes in accretable yield during the three months ended March 31, 2015 in regard to loans transferred at acquisition for which it was probable that all contractually required payments would not be collected are presented in the table below. Activity in accretable yield for the three months ended March 31, 2014 was not material.

	Three Months Ended March 31, 2015
Balance at January 1, 2015	$	2,546
Additions	—
Accretion	(184		)
Net transfers to/from nonaccretable	—
Balance at March 31, 2015	$	2,362

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Securities Available for Sale

3 Months Ended

Mar. 31, 2015

Available-for-sale Securities [Abstract]

Securities Available for Sale

Securities Available for Sale

Securities available for sale have been classified in the consolidated balance sheets according to management’s intent. The amortized cost of securities and their approximate fair values at March 31, 2015 and December 31, 2014, are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Securities Available for Sale
March 31, 2015:
U.S. treasuries	$	999	$	9	$	—		$	1,008
Government agency securities	53,964		446		(121		)	54,289
Obligations of state and municipal subdivisions	73,587		2,121		(301		)	75,407
Corporate bonds	1,066		32		—			1,098
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	64,367		1,981		(1		)	66,347
	$	193,983	$	4,589	$	(423	)	$	198,149
December 31, 2014:
U.S. treasuries	$	999	$	7	$	—		$	1,006
Government agency securities	58,174		199		(350		)	58,023
Obligations of state and municipal subdivisions	75,599		1,837		(537		)	76,899
Corporate bonds	1,068		13		—			1,081
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	67,437		1,616		—			69,053
	$	203,277	$	3,672	$	(887	)	$	206,062

Securities with a carrying amount of approximately $141,091 and $174,741 at March 31, 2015 and December 31, 2014, respectively, were pledged to secure public fund deposits and repurchase agreements.

There were no sales of securities during the three months ended March 31, 2015 and 2014.

The amortized cost and estimated fair value of securities available for sale at March 31, 2015, by contractual maturity, are shown below. Maturities of pass-through certificates will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.   

	March 31, 2015
	Securities Available for Sale
	Amortized Cost		Fair Value
Due in one year or less	$	2,801	$	2,803
Due from one year to five years	49,616		49,743
Due from five to ten years	36,768		37,433
Thereafter	40,431		41,823
	129,616		131,802
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	64,367		66,347
	$	193,983	$	198,149

The number of securities, unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of March 31, 2015 and December 31, 2014, are summarized as follows:   

	Less Than 12 Months						Greater Than 12 Months						Total
Description of Securities	Number of Securities	Estimated Fair Value		Unrealized Losses			Number of Securities	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
Securities Available for Sale
March 31, 2015
Government agency securities	—	$	—	$	—		12	$	20,877	$	(121	)	$	20,877	$	(121	)
Obligations of state and municipal subdivisions	9	3,597		(11		)	25	11,990		(290		)	15,587		(301		)
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	1	93		(1		)	—	—		—			93		(1		)
	10	$	3,690	$	(12	)	37	$	32,867	$	(411	)	$	36,557	$	(423	)
December 31, 2014
Government agency securities	6	$	6,396	$	(24	)	14	$	22,671	$	(326	)	$	29,067	$	(350	)
Obligations of state and municipal subdivisions	44	16,636		(197		)	13	8,541		(340		)	25,177		(537		)
	50	$	23,032	$	(221	)	27	$	31,212	$	(666	)	$	54,244	$	(887	)

Unrealized losses are generally due to changes in interest rates. The Company has the intent to hold these securities until maturity or a forecasted recovery, and it is more likely than not that the Company will not have to sell the securities before the recovery of their cost basis. As such, the losses are deemed to be temporary.

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Statement of Cash Flows (Tables)

3 Months Ended

Mar. 31, 2015

Supplemental Cash Flow Elements [Abstract]

Other Supplemental Cash Flow Information

Other supplemental cash flow information is presented below:

	Three Months Ended March 31,
	2015		2014
Cash transactions:
Interest expense paid	$	5,754	$	3,045
Income taxes paid	$	6,150	$	2,700
Noncash transactions:
Accrued preferred stock dividends	$	60	$	—
Transfers of loans to other real estate owned	$	—	$	120
Loans to facilitate the sale of other real estate owned	$	—	$	48
Securities purchased, not yet settled	$	—	$	2,000
Excess tax benefit on restricted stock vested	$	3	$	1,022

The supplemental schedule of noncash investing activities from Company acquisition activity is as follows:

	Three Months Ended March 31,
	2015		2014
Noncash assets acquired
Cash and cash equivalents	$	—	$	32,246
Securities available for sale	—		16,740
Loans	—		71,138
Premises and equipment	—		2,600
Goodwill	—		7,122
Core deposit intangibles	—		882
Other assets	—		230
Total assets	$	—	$	130,958
Noncash liabilities assumed:
Deposits	$	—	$	104,960
Repurchase agreements	—		3,733
Other liabilities	—		565
Total liabilities	$	—	$	109,258
Cash paid to shareholders of acquired banks	$	—	$	10,000
Fair value of common stock issued to shareholders of acquired bank	$	—	$	11,700

In addition, the following measurement-period adjustments were made during the period relating to Company acquisition activity:

	Three Months Ended March 31,
	2015		2014
Noncash assets acquired:
Loans	$	—	$	(328	)
Goodwill	182		749
Core deposit intangibles	—		(18		)
Deferred tax asset	—		109
Other assets	—		10
Total assets	$	182	$	522
Noncash liabilities assumed:
Deposits	$	—	$	505
Other liabilities	182		17
Total liabilities	$	182	$	522

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Business Combinations

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Business Combinations

Business Combination

BOH Holdings

During the three months ended March 31, 2015, the Company made measurement-period adjustments to previously-reported acquisition accounting estimates for the April 15, 2014 acquisition of BOH Holdings. Additional termination accruals were identified that related to BOH accounts that existed prior to the acquisition and resulted in an increase of $182 to other liabilities and to goodwill.

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Income Taxes

3 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Income tax expense for the three months ended March 31, 2015 and 2014 was as follows:

	Three Months Ended March 31,
	2015			2014
Income tax expense for the period	$	4,536		$	2,339
Effective tax rate	32.4		%	32.8		%

The effective tax rates differ from the statutory federal tax rate of 35% largely due to tax exempt interest income earned on certain investment securities and loans and the nontaxable earnings on bank owned life insurance.

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Stock Awards and Stock Warrants Stock Awards and Stock Warrants (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Number of Shares
Nonvested shares, beginning balance (shares)	373,886	306,524
Granted during the period (shares)	87,124	27,183
Vested during the period (shares)	(19,016)	(92,000)
Nonvested shares, ending balance (shares)	441,994	241,707
Weighted Average Grant Date Fair Value
Nonvested shares, beginning balance (usd per share)	$ 41.58	$ 22.75
Granted during the period (usd per share)	$ 31.41	$ 50.80
Vested during the period (usd per share)	$ 32.98	$ 17.92
Nonvested shares, ending balance (usd per share)	$ 40.16	$ 27.75

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Financial Instruments with Off-Balance Sheet Risk

The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. The commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the balance sheet.

The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual amount of this instrument. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. At March 31, 2015 and December 31, 2014, the approximate amounts of these financial instruments were as follows:

	March 31,		December 31,
	2015		2014
Commitments to extend credit	$	566,165	$	565,881
Standby letters of credit	7,110		8,571
	$	573,275	$	574,452

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 expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained if deemed necessary by the Company upon extension of credit is based on management’s credit evaluation of the counterparty. Collateral held varies but may include accounts receivable, inventory, farm crops, property, plant and equipment and income-producing commercial properties.

Letters of credit are written conditional commitments used by the Company to guarantee the performance of a customer to a third party. The Company’s policies generally require that letter of credit arrangements contain security and debt covenants similar to those contained in loan arrangements. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount shown in the table above. If the commitment is funded, the Company would be entitled to seek recovery from the customer. As of March 31, 2015 and December 31, 2014, no amounts have been recorded as liabilities for the Company’s potential obligations under these guarantees.

Litigation

The Company is involved in certain legal actions arising from normal business activities. Management believes that the outcome of such proceedings will not materially affect the financial position, results of operations or cash flows of the Company.

Lease Commitments

The Company leases certain branch facilities and other facilities. Rent expense related to these leases amounted to $483 and $198 for the three months ended March 31, 2015 and 2014, respectively.

Other

In March 2015, the Company entered into a purchase agreement totaling $8,800 to purchase a new aircraft for the Company. Through March 31, 2015, the Company has made payments totaling $2,000 with the remaining $6,800 due at time of delivery of the aircraft, which is scheduled for September 2015. The Company is currently in negotiations to sell its current aircraft.

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Repurchase Agreements and Other Borrowings

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Repurchase Agreements and Other Borrowings

Repurchase Agreements and Other Borrowings

At March 31, 2015 and December 31, 2014, repurchase agreements totaled $5,783 and $4,012, respectively. Securities held in safekeeping totaling $5,784 are pledged as security on these repurchase agreement accounts.

Other borrowings, including those borrowings due to related parties totaled $72,105 and $72,730 at March 31, 2015 and December 31, 2014, respectively. Scheduled principal payments of $625 were made on January 15, 2015 for subordinated debentures issued to individuals.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC Topic 820, Fair Value Measurements and Disclosures, establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:

Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means.

Level 3 Inputs – Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities.

The following table represents assets reported on the consolidated balance sheets at their fair value on a recurring basis as of March 31, 2015 and December 31, 2014 by level within the ASC Topic 820 fair value measurement hierarchy:

			Fair Value Measurements at Reporting Date Using
	Assets/ Liabilities Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2015
Measured on a recurring basis:
Assets:
Investment securities available for sale:
U.S. treasuries	$	1,008	$	—	$	1,008	$	—
Government agency securities	54,289		—		54,289		—
Obligations of state and municipal subdivisions	75,407		—		75,407		—
Corporate bonds	1,098		—		1,098		—
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	66,347		—		66,347		—
December 31, 2014
Measured on a recurring basis:
Assets:
Investment securities available for sale:
U.S. treasuries	$	1,006	$	—	$	1,006	$	—
Government agency securities	58,023		—		58,023		—
Obligations of state and municipal subdivisions	76,899		—		76,899		—
Corporate bonds	1,081		—		1,081		—
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	69,053		—		69,053		—

There were no transfers between level categorizations and no changes in valuation methodologies for the periods presented.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.

Securities classified as available for sale are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury and other yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things.

In accordance with ASC Topic 820, certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the assets and liabilities are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents the assets carried on the consolidated balance sheet by caption and by level in the fair value hierarchy at March 31, 2015 and December 31, 2014, for which a nonrecurring change in fair value has been recorded:

			Fair Value Measurements at Reporting Date Using
	Assets Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Period Ended Total (Gains) Losses
March 31, 2015
Measured on a nonrecurring basis:
Assets:
Impaired loans	$	4,203	$	—	$	—	$	4,203	$	709
Other real estate	—		—		—		—		$	—
December 31, 2014
Measured on a nonrecurring basis:
Assets:
Impaired loans	$	4,943	$	—	$	—	$	4,943	$	188
Other real estate	138		—		—		138		22

Impaired loans (loans which are not expected to repay all principal and interest amounts due in accordance with the original contractual terms) are measured at an observable market price (if available) or at the fair value of the loan’s collateral (if collateral dependent). Fair value of the loan’s collateral is determined by appraisals or independent valuation, which is then adjusted for the estimated costs related to liquidation of the collateral. Management’s ongoing review of appraisal information may result in additional discounts or adjustments to valuation based upon more recent market sales activity or more current appraisal information derived from properties of similar type and/or locale. Therefore, the Company has categorized its impaired loans as Level 3.

The Company has no nonfinancial assets or nonfinancial liabilities measured at fair value on a recurring basis. Other real estate is measured at fair value on a nonrecurring basis (upon initial recognition or subsequent impairment). Other real estate is classified within Level 3 of the valuation hierarchy. When transferred from the loan portfolio, other real estate is adjusted to fair value less estimated selling costs and is subsequently carried at the lower of carrying value or fair value less estimated selling costs. The fair value is determined using an external appraisal process, discounted based on internal criteria.

In addition, mortgage loans held for sale are required to be measured at the lower of cost or fair value. The fair value of mortgage loans held for sale is based upon binding quotes or bids from third party investors. As of March 31, 2015 and December 31, 2014, all mortgage loans held for sale were recorded at cost.

The methods and assumptions used by the Company in estimating fair values of financial instruments as disclosed herein in accordance with ASC Topic 825, Financial Instruments, other than for those measured at fair value on a recurring and nonrecurring basis discussed above, are as follows:

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

Loans and loans held for sale: For variable-rate loans that reprice frequently and have no significant changes in credit risk, fair values are based on carrying values. Fair values for certain mortgage loans (for example, one-to-four family residential), commercial real estate and commercial loans are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality.

Federal Home Loan Bank of Dallas and other restricted stock: The carrying value of restricted securities such as stock in the Federal Home Loan Bank of Dallas and Independent Bankers Financial Corporation approximates fair value.

Deposits: The fair values disclosed for demand deposits are, by definition, equal to the amount payable on demand at the reporting date (that is their carrying amounts). The carrying amounts of variable-rate certificates of deposit (CDs) approximate their fair values at the reporting date. Fair values for fixed-rate CDs are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits.

Federal Home Loan Bank advances, line of credit and federal funds purchased: The fair value of advances maturing within 90 days approximates carrying value. Fair value of other advances is based on the Company’s current borrowing rate for similar arrangements.

Repurchase agreements and other borrowings: The carrying value of repurchase agreements approximates fair value due to the short term nature. The fair values of private subordinated debentures are based upon prevailing rates on similar debt in the market place. The subordinated notes that are publicly traded are valued based on indicative bid prices based upon market pricing observations in the current market.

Junior subordinated debentures: The fair value of junior subordinated debentures is estimated using discounted cash flow analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements.

Accrued interest: The carrying amounts of accrued interest approximate their fair values.

Off-balance sheet instruments: Fair values for off-balance sheet, credit-related financial instruments are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties' credit standing. The fair value of commitments is not material.

The carrying amount, estimated fair value and the level of the fair value hierarchy of the Company’s financial instruments were as follows at March 31, 2015 and December 31, 2014:

					Fair Value Measurements at Reporting Date Using
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2015
Financial assets:
Cash and cash equivalents	$	358,798	$	358,798	$	358,798	$	—	$	—
Securities available for sale	198,149		198,149		—		198,149		—
Loans held for sale	7,034		7,034		—		7,034		—
Loans, net	3,283,021		3,302,768		—		3,296,646		6,122
FHLB of Dallas stock and other restricted stock	12,333		12,333		—		12,333		—
Accrued interest receivable	9,111		9,111		—		9,111		—
Financial liabilities:
Deposits	3,386,678		3,388,747		—		3,388,747		—
Accrued interest payable	1,823		1,823		—		1,823		—
FHLB advances	219,386		219,556		—		219,556		—
Repurchase agreements	5,783		5,783		—		5,783		—
Other borrowings	72,105		74,686		—		74,686		—
Junior subordinated debentures	18,147		18,137		—		18,137		—
Off-balance sheet assets (liabilities):
Commitments to extend credit	—		—		—		—		—
Standby letters of credit	—		—		—		—		—
December 31, 2014
Financial assets:
Cash and cash equivalents	$	324,047	$	324,047	$	324,047	$	—	$	—
Securities available for sale	206,062		206,062		—		206,062		—
Loans held for sale	4,453		4,453		—		4,453		—
Loans, net	3,182,045		3,203,337		—		3,200,261		3,076
FHLB of Dallas stock and other restricted stock	12,321		12,321		—		12,321		—
Accrued interest receivable	9,655		9,655		—		9,655		—
Financial liabilities:
Deposits	3,249,598		3,252,114		—		3,252,114		—
Accrued interest payable	2,919		2,919		—		2,919		—
FHLB advances	229,405		228,607		—		228,607		—
Repurchase agreements	4,012		4,012		—		4,012		—
Other borrowings	72,730		75,164		—		75,164		—
Junior subordinated debentures	18,147		18,134		—		18,134		—
Off-balance sheet assets (liabilities):
Commitments to extend credit	—		—		—		—		—
Standby letters of credit	—		—		—		—		—

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Business Combination - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 182	$ 749
Other Liabilites	0	505
BOH Holdings, Inc.
Business Acquisition [Line Items]
Goodwill	182
Other Liabilites	$ 182

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Regulatory Matters-Actual Capital Amounts and Ratios (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Consolidated
Total capital to risk weighted assets:
Actual Amount	$ 412,795	$ 402,326
Actual Ratio (percent)	11.88%	12.59%
Minimum Required for Capital Adequacy Purposes Amount	277,924	255,633
Minimum Required for Capital Adequacy Purposes Ratio (percent)	8.00%	8.00%
Tier 1 capital to risk weighted assets:
Actual Amount	323,305	314,136
Actual Ratio (percent)	9.31%	9.83%
Minimum Required for Capital Adequacy Purposes Amount	208,443	127,817
Minimum Required for Capital Adequacy Purposes Ratio (percent)	6.00%	4.00%
Common equity tier 1 to risk weighted assets
Actual Amount	299,367
Actual Ratio (percent)	8.62%
Minimum Required for Capital Adequacy Purposes Amount	156,333
Minimum Required for Capital Adequacy Purposes Ratio (percent)	4.50%
Tier 1 capital to average assets:
Actual Amount	323,305	314,136
Actual Ratio (percent)	7.78%	8.15%
Minimum Required for Capital Adequacy Purposes Amount	166,160	154,270
Minimum Required for Capital Adequacy Purposes Ratio (percent)	4.00%	4.00%
Bank
Total capital to risk weighted assets:
Actual Amount	406,452	397,512
Actual Ratio (percent)	11.71%	12.46%
Minimum Required for Capital Adequacy Purposes Amount	277,597	255,219
Minimum Required for Capital Adequacy Purposes Ratio (percent)	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	346,996	319,024
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (percent)	10.00%	10.00%
Tier 1 capital to risk weighted assets:
Actual Amount	386,225	378,960
Actual Ratio (percent)	11.13%	11.88%
Minimum Required for Capital Adequacy Purposes Amount	208,198	127,609
Minimum Required for Capital Adequacy Purposes Ratio (percent)	6.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	277,597	191,414
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (percent)	8.00%	6.00%
Common equity tier 1 to risk weighted assets
Actual Amount	386,225
Actual Ratio (percent)	11.13%
Minimum Required for Capital Adequacy Purposes Amount	156,148
Minimum Required for Capital Adequacy Purposes Ratio (percent)	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	225,547
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (percent)	6.50%
Tier 1 capital to average assets:
Actual Amount	386,225	378,960
Actual Ratio (percent)	9.93%	9.93%
Minimum Required for Capital Adequacy Purposes Amount	155,549	152,598
Minimum Required for Capital Adequacy Purposes Ratio (percent)	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 194,436	$ 190,747
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (percent)	5.00%	5.00%

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Statement of Cash Flows - Noncash Investing Activities from Acquisitions and Branch Sale (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Noncash assets acquired
Cash and cash equivalents	$ 0	$ 32,246
Securities available for sale	0	16,740
Loans	0	71,138
Premises and equipment	0	2,600
Goodwill	0	7,122
Core deposit intangibles	0	882
Other assets	0	230
Total assets	0	130,958
Noncash liabilities assumed:
Deposits	0	104,960
Repurchase agreements	0	3,733
Other liabilities	0	565
Total liabilities	0	109,258
Cash paid to shareholders of acquired banks	0	10,000
Fair value of common stock issued to shareholders of acquired bank	$ 0	$ 11,700

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Loans, Net and Allowance for Loan Losses Loans, Net and Allowance for Loan Losses - Accretable Yield Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at January 1, 2015	$ 2,546
Additions	0
Accretion	(184)
Net transfers to/from nonaccretable	0
Balance at March 31, 2015	$ 2,362

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation: The accompanying consolidated financial statements include the accounts of IBG, its wholly-owned subsidiaries, the Bank and IBG Adriatica Holdings, Inc. (Adriatica) and the Bank’s wholly-owned subsidiaries, IBG Real Estate Holdings, Inc. and IBG Aircraft Acquisition, Inc. Adriatica was formed in 2011 to acquire a mixed use residential and retail real estate development in McKinney, Texas. Adriatica was dissolved during the first quarter of 2014. All material intercompany transactions and balances have been eliminated in consolidation. In addition, the Company wholly-owns IB Trust I (Trust I), IB Trust II (Trust II), IB Trust III (Trust III), IB Centex Trust I (Centex Trust I) and Community Group Statutory Trust I (CGI Trust I). The Trusts were formed to issue trust preferred securities and do not meet the criteria for consolidation.

The consolidated interim financial statements are unaudited, but include all adjustments, which, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in the Company's Annual Report of Form10-K for the year ended December 31, 2014. The consolidated statement of condition at December 31, 2014 had been derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements.

Segment Reporting

Segment Reporting: The Company has one reportable segment. The Company’s chief operating decision-maker uses consolidated results to make operating and strategic decisions.

Subsequent Events

Subsequent events: Companies are required to evaluate events and transactions that occur after the balance sheet date but before the date the financial statements are issued. They must recognize in the financial statements the effect of all events or transactions that provide additional evidence of conditions that existed at the balance sheet date, including the estimates inherent in the financial statement preparation process. Entities shall not recognize the impact of events or transactions that provide evidence about conditions that did not exist at the balance sheet date but arose after that date. The Company has evaluated subsequent events through the date of filing these financial statements with the SEC and noted no subsequent events requiring financial statement recognition or disclosure, except as disclosed in Note 12.

Earnings Per Share

Earnings per share: Basic earnings per common share are net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. The unvested share-based payment awards that contain rights to non forfeitable dividends are considered participating securities for this calculation. Diluted earnings per common share include the dilutive effect of additional potential common shares issuable under stock warrants. The dilutive effect of participating non vested common stock was not included as it was anti-dilutive. Proceeds from the assumed exercise of dilutive stock warrants are assumed to be used to repurchase common stock at the average market price.

Allowance for Loan Losses

The allowance is derived from the following two components: 1) allowances established on individual impaired loans, which are based on a review of the individual characteristics of each loan, including the customer’s ability to repay the loan, the underlying collateral values, and the industry in which the customer operates, and 2) allowances based on actual historical loss experience for the last three years for similar types of loans in the Company’s loan portfolio adjusted for primarily changes in the lending policies and procedures; collection, charge-off and recovery practices; nature and volume of the loan portfolio; volume and severity of nonperforming loans; existence and effect of any concentrations of credit and the level of such concentrations and current, national and local economic and business conditions. This second component also includes an unallocated allowance to cover uncertainties that could affect management’s estimate of probable losses. The unallocated allowance reflects the imprecision inherent in the underlying assumptions used in the methodologies for estimating this component.

The Company’s management continually evaluates the allowance for loan losses determined from the allowances established on individual loans and the amounts determined from historical loss percentages adjusted for the qualitative factors above. Should any of the factors considered by management change, the Company’s estimate of loan losses could also change and would affect the level of future provision expense. While the calculation of the allowance for loan losses utilizes management’s best judgment and all the information available, the adequacy of the allowance for loan losses is dependent on a variety of factors beyond the Company’s control, including, among other things, the performance of the entire loan portfolio, the economy, changes in interest rates and the view of regulatory authorities towards loan classifications.

Nonaccrual Loan and Lease Status

The accrual of interest is discontinued on a loan when management believes after considering collection efforts and other factors that the borrower's financial condition is such that collection of interest is doubtful. All interest accrued but not collected for loans that are placed on nonaccrual status or charged-off is reversed against interest income. Cash collections on nonaccrual loans are generally credited to the loan receivable balance, and no interest income is recognized on those loans until the principal balance has been collected. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Impaired loans are those loans where it is probable that all amounts due according to contractual terms of the loan agreement will not be collected. The Company has identified these loans through its normal loan review procedures. Impaired loans are measured based on 1) the present value of expected future cash flows discounted at the loans effective interest rate; 2) the loan's observable market price; or 3) the fair value of collateral if the loan is collateral dependent. Substantially all of the Company’s impaired loans are measured at the fair value of the collateral. In limited cases, the Company may use the other methods to determine the level of impairment of a loan if such loan is not collateral dependent.

Troubled Debt Restructuring

Certain impaired loans have adequate collateral and do not require a related allowance for loan loss.

The Company will charge off that portion of any loan which management considers a loss. Commercial and real estate loans are generally considered for charge-off when exposure beyond collateral coverage is apparent and when no further collection of the loss portion is anticipated based on the borrower’s financial condition.

The restructuring of a loan is considered a “troubled debt restructuring” if both 1) the borrower is experiencing financial difficulties and 2) the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, principal forgiveness, extending amortization and other actions intended to minimize potential losses.

A “troubled debt restructured” loan is identified as impaired and measured for credit impairment as of each reporting period in accordance with the guidance in  Accounting Standards Codification (ASC) 310-10-35.

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

At March 31, 2015 and December 31, 2014, the approximate amounts of these financial instruments were as follows:

	March 31,		December 31,
	2015		2014
Commitments to extend credit	$	566,165	$	565,881
Standby letters of credit	7,110		8,571
	$	573,275	$	574,452

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Loans, Net and Allowance for Loan Losses - Outstanding Balance and Related Carrying Amount of Purchased Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Oct. 01, 2014	Apr. 15, 2014	Jan. 01, 2014
Business Acquisition [Line Items]
Outstanding balance	$ 63,595	$ 69,371
Carrying amount	54,837	59,697
Houston City Bancshares, Inc.
Business Acquisition [Line Items]
Outstanding balance			12,021
Nonaccretable difference			(1,240)
Accretable yield			(561)
Carrying amount			10,220
BOH Holdings, Inc.
Business Acquisition [Line Items]
Outstanding balance				55,718
Nonaccretable difference				(5,798)
Accretable yield				(2,579)
Carrying amount				47,341
Live Oak Financial Corp.
Business Acquisition [Line Items]
Outstanding balance					3,583
Nonaccretable difference					(519)
Accretable yield					(182)
Carrying amount					$ 2,882

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Loans, Net and Allowance for Loan Losses - Composition of Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	$ 3,303,949	$ 3,201,084
Deferred loan fees	(701)	(487)
Allowance for loan losses	(20,227)	(18,552)	(14,841)	(13,960)
Loans, net	3,283,021	3,182,045
Commercial
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	697,449	672,052
Allowance for loan losses	(6,078)	(5,051)	(2,620)	(2,401)
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	1,555,462	1,450,434
Commercial construction, land and land development
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	301,944	334,964
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	515,716	514,025
Allowance for loan losses	(2,194)	(2,205)	(2,278)	(2,440)
Single-Family Interim Construction
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	148,202	138,278
Allowance for loan losses	(734)	(669)	(536)	(577)
Agricultural
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	37,650	38,822
Allowance for loan losses	(238)	(246)	(244)	(238)
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	47,387	52,267
Allowance for loan losses	(156)	(146)	(353)	(363)
Other
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	139	242
Allowance for loan losses	$ 0	$ 0	$ 0	$ 0

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 9,452	$ 4,801
Other comprehensive income before tax:
Change in net unrealized gains on available for sale securities during the year	1,381	2,429
Reclassification adjustment for loss on sale of securities available for sale included in net income	0	0
Other comprehensive income before tax	1,381	2,429
Income tax expense	483	850
Other comprehensive income, net of tax	898	1,579
Comprehensive income	$ 10,350	$ 6,380

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Statement of Cash Flows

3 Months Ended

Mar. 31, 2015

Supplemental Cash Flow Elements [Abstract]

Statement of Cash Flows

Statement of Cash Flows

As allowed by the accounting standards, the Company has chosen to report on a net basis its cash receipts and cash payments for time deposits accepted and repayments of those deposits, and loans made to customers and principal collections on those loans. The Company uses the indirect method to present cash flows from operating activities. Other supplemental cash flow information is presented below:

	Three Months Ended March 31,
	2015		2014
Cash transactions:
Interest expense paid	$	5,754	$	3,045
Income taxes paid	$	6,150	$	2,700
Noncash transactions:
Accrued preferred stock dividends	$	60	$	—
Transfers of loans to other real estate owned	$	—	$	120
Loans to facilitate the sale of other real estate owned	$	—	$	48
Securities purchased, not yet settled	$	—	$	2,000
Excess tax benefit on restricted stock vested	$	3	$	1,022

The supplemental schedule of noncash investing activities from Company acquisition activity is as follows:

	Three Months Ended March 31,
	2015		2014
Noncash assets acquired
Cash and cash equivalents	$	—	$	32,246
Securities available for sale	—		16,740
Loans	—		71,138
Premises and equipment	—		2,600
Goodwill	—		7,122
Core deposit intangibles	—		882
Other assets	—		230
Total assets	$	—	$	130,958
Noncash liabilities assumed:
Deposits	$	—	$	104,960
Repurchase agreements	—		3,733
Other liabilities	—		565
Total liabilities	$	—	$	109,258
Cash paid to shareholders of acquired banks	$	—	$	10,000
Fair value of common stock issued to shareholders of acquired bank	$	—	$	11,700

In addition, the following measurement-period adjustments were made during the period relating to Company acquisition activity:

	Three Months Ended March 31,
	2015		2014
Noncash assets acquired:
Loans	$	—	$	(328	)
Goodwill	182		749
Core deposit intangibles	—		(18		)
Deferred tax asset	—		109
Other assets	—		10
Total assets	$	182	$	522
Noncash liabilities assumed:
Deposits	$	—	$	505
Other liabilities	182		17
Total liabilities	$	182	$	522

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Fair Value Measurements-Assets and Liabilities at Fair Value on Nonrecurring Basis (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	$ 4,203	$ 4,943
Period Ended Total (Gains) Losses	709	188
Impaired loans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	0
Impaired loans | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	0
Impaired loans | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	4,203	4,943
Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	138
Period Ended Total (Gains) Losses	0	22
Other real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	0
Other real estate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	0
Other real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	$ 0	$ 138

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense

Income tax expense for the three months ended March 31, 2015 and 2014 was as follows:

	Three Months Ended March 31,
	2015			2014
Income tax expense for the period	$	4,536		$	2,339
Effective tax rate	32.4		%	32.8		%

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Securities Available for Sale-Amortized Cost and Estimated Fair Value of Securities Available for Sale by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Amortized Cost
Due in one year or less	$ 2,801
Due from one year to five years	49,616
Due from five to ten years	36,768
Thereafter	40,431
SIngle maturity dates, amortized cost basis	129,616
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	64,367
Amortized Cost	193,983	203,277
Fair Value
Due in one year or less	2,803
Due from one year to five years	49,743
Due from five to ten years	37,433
Thereafter	41,823
Single maturity date fair value	131,802
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	66,347
Fair Value	$ 198,149	$ 206,062

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Subsequent Events

3 Months Ended

Mar. 31, 2015

Subsequent Events [Abstract]

Subsequent Events

Subsequent Event

Declaration of Dividends

On May 1, 2015, the Company declared a quarterly cash dividend in the amount of $0.08 per share of common stock to the stockholders of record on May 15, 2015. The dividend will be paid on May 28, 2015.

Revised Capital Ratios

Subsequent to the Company’s issuance of its first quarter earnings release on April 27, 2015, the Company changed its calculation of risk weighted assets, which in turn affected the risk weighted capital ratios reported in the earnings release. After the issuance of the earnings release, the Company discovered that an incorrect credit conversion factor had been applied to certain unfunded commitments in calculating the amount of risk weighted assets. Due to this calculation error, risk weighted assets were overstated by approximately $112 million which resulted in the Company’s common equity tier 1 capital to risk weighted assets, tier 1 capital to risk weighted assets and total capital to risk-weighted assets ratios being understated in the earnings release by approximately 27, 29 and 37 basis points, respectively. The Company’s risk weighted capital ratios set forth in footnote 10 of the financial statements are based upon the corrected calculation and reflect an increase in the risk weighted capital ratios previously reported in the earnings release. The Company continues to be well capitalized under applicable regulations.