10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended September 30, 2018

OR

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

For the transition period from ____________ to ____________

Commission file number: 0-12247

SOUTHSIDE BANCSHARES, INC.

(Exact name of registrant as specified in its charter)

TEXAS	75-1848732
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1201 S. Beckham Avenue, Tyler, Texas	75701
(Address of principal executive offices)	(Zip Code)

903-531-7111

(Registrant’s telephone number, including area code)

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

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

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

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
	Emerging growth company o
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

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

The number of shares of the issuer’s common stock, par value $1.25, outstanding as of October 22, 2018 was 35,159,939 shares.

TABLE OF CONTENTS

PART I.  FINANCIAL INFORMATION
ITEM 1.  FINANCIAL STATEMENTS	1
ITEM 2.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	47
ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	72
ITEM 4.  CONTROLS AND PROCEDURES	73
PART II.  OTHER INFORMATION
ITEM 1.  LEGAL PROCEEDINGS	73
ITEM 1A.  RISK FACTORS	73
ITEM 2.  UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	73
ITEM 3.  DEFAULTS UPON SENIOR SECURITIES	73
ITEM 4.  MINE SAFETY DISCLOSURES	73
ITEM 5.  OTHER INFORMATION	73
ITEM 6.  EXHIBITS	74
EXHIBIT INDEX	74
SIGNATURES	75

PART I.   FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts)
	September 30, 2018			December 31, 2017
ASSETS
Cash and due from banks	$	85,103		$	79,171
Interest earning deposits	70,685			111,541
Federal funds sold	18,284			7,980
Total cash and cash equivalents	174,072			198,692
Securities available for sale, at estimated fair value	1,939,277			1,538,755
Securities held to maturity, at carrying value (estimated fair value of $156,472 and $921,800, respectively)	163,365			909,506
FHLB stock, at cost	32,291			55,729
Equity investments	12,029			5,821
Loans held for sale	954			2,001
Loans:
Loans	3,274,524			3,294,356
Less:  Allowance for loan losses	(26,092		)	(20,781		)
Net loans	3,248,432			3,273,575
Premises and equipment, net	133,939			133,640
Goodwill	201,116			201,246
Other intangible assets, net	19,009			22,993
Interest receivable	22,456			28,491
Deferred tax asset, net	16,433			12,204
Unsettled trades to sell securities	14,602			—
Unsettled issuances of brokered certificates of deposit	10,000			—
Bank owned life insurance	97,611			100,368
Other assets	19,768			15,076
Total assets	$	6,105,354		$	6,498,097
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposits:
Noninterest bearing	$	1,033,572		$	1,037,401
Interest bearing	3,519,940			3,478,046
Total deposits	4,553,512			4,515,447
Federal funds purchased and repurchase agreements	8,975			9,498
FHLB borrowings	561,267			1,017,361
Subordinated notes, net of unamortized debt issuance costs	98,366			98,248
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,244			60,241
Unsettled trades to purchase securities	28,662			—
Other liabilities	41,822			43,162
Total liabilities	5,352,848			5,743,957
Off-balance-sheet arrangements, commitments and contingencies (Note 13)
Shareholders’ equity:
Common stock:  ($1.25 par value, 80,000,000 shares authorized and 37,832,989 shares issued at September 30, 2018 and 40,000,000 shares authorized and 37,802,352 shares issued at December 31, 2017)	47,291			47,253
Paid-in capital	761,594			757,439
Retained earnings	58,578			32,851
Treasury stock, shares at cost (2,673,050 at September 30, 2018 and 2,802,019 at December 31, 2017)	(45,966		)	(47,105		)
Accumulated other comprehensive loss	(68,991		)	(36,298		)
Total shareholders’ equity	752,506			754,140
Total liabilities and shareholders’ equity	$	6,105,354		$	6,498,097

The accompanying notes are an integral part of these consolidated financial statements.

1

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (in thousands, except per share data)
	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2018			2017		2018			2017
Interest income
Loans	$	39,831		$	29,322	$	117,962		$	84,666
Investment securities – taxable	36			58		314			702
Investment securities – tax-exempt	6,331			5,670		19,065			18,381
Mortgage-backed securities	10,086			10,567		31,190			31,430
FHLB stock and equity investments	377			329		1,202			926
Other interest earning assets	491			527		1,410			1,265
Total interest income	57,152			46,473		171,143			137,370
Interest expense
Deposits	9,497			5,420		25,529			14,839
FHLB borrowings	3,108			4,156		9,747			11,171
Subordinated notes	1,423			1,413		4,228			4,204
Trust preferred subordinated debentures	684			520		1,911			1,481
Other borrowings	30			4		74			11
Total interest expense	14,742			11,513		41,489			31,706
Net interest income	42,410			34,960		129,654			105,664
Provision for loan losses	975			960		5,991			3,404
Net interest income after provision for loan losses	41,435			34,000		123,663			102,260
Noninterest income
Deposit services	6,317			5,476		18,757			15,845
Net (loss) gain on sale of securities available for sale	(741		)	627		(1,900		)	874
Gain on sale of loans	303			347		591			1,553
Trust income	1,568			873		5,259			2,662
Bank owned life insurance income	552			636		2,369			1,905
Brokerage services	532			561		1,488			1,790
Other	1,491			888		4,075			3,745
Total noninterest income	10,022			9,408		30,639			28,374
Noninterest expense
Salaries and employee benefits	17,628			14,472		52,820			45,463
Occupancy expense	3,396			2,981		10,339			8,741
Acquisition expense	437			405		2,295			878
Advertising, travel & entertainment	648			487		2,108			1,618
ATM and debit card expense	251			1,024		840			2,840
Professional fees	824			996		2,846			2,985
Software and data processing expense	977			732		2,939			2,145
Telephone and communications	354			459		1,370			1,461
FDIC insurance	435			441		1,416			1,327
Amortization expense on intangibles	1,279			388		3,985			1,229
Other	2,733			2,622		8,945			7,715
Total noninterest expense	28,962			25,007		89,903			76,402
Income before income tax expense	22,495			18,401		64,399			54,232
Income tax expense	2,192			3,890		7,642			10,251
Net income	$	20,303		$	14,511	$	56,757		$	43,981
Earnings per common share – basic	$	0.58		$	0.49	$	1.62		$	1.50
Earnings per common share – diluted	$	0.58		$	0.49	$	1.61		$	1.49
Dividends paid per common share	$	0.30		$	0.28	$	0.88		$	0.81

The accompanying notes are an integral part of these consolidated financial statements.

2

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (in thousands)
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Net income	$	20,303		$	14,511		$	56,757		$	43,981
Other comprehensive (loss) income:
Securities available for sale and transferred securities:
Change in net unrealized holding (losses) gains on available for sale securities during the period	(16,885		)	344			(65,039		)	18,450
Unrealized net gain on securities transferred from held to maturity to available for sale under the transition guidance enumerated in ASU 2017-12	—			—			11,881			—
Change in net unrealized losses on securities transferred from held to maturity to available for sale	—			—			401			—
Reclassification adjustment for net loss on equity investments, reclassified to retained earnings with adoption of ASU 2016-01	—			—			107			—
Reclassification adjustment for amortization related to available for sale and held to maturity debt securities	(661		)	490			729			1,191
Reclassification adjustment for net loss (gain) on sale of available for sale securities, included in net income	741			(627		)	1,900			(874		)
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	1,894			(236		)	7,864			(2,084		)
Change in net unrealized gains on interest rate swap derivatives terminated during the period	—			—			—			273
Reclassification adjustment from other comprehensive income (loss) related to derivatives designated as cash flow hedge	(406		)	101			(864		)	694
Pension plans:
Amortization of net actuarial loss and prior service credit, included in net periodic benefit cost	546			402			1,637			1,205
Other comprehensive (loss) income, before tax	(14,771		)	474			(41,384		)	18,855
Income tax benefit (expense) related to items of other comprehensive income (loss)	3,102			(166		)	8,691			(6,599		)
Other comprehensive (loss) income, net of tax	(11,669		)	308			(32,693		)	12,256
Comprehensive income	$	8,634		$	14,819		$	24,064		$	56,237

The accompanying notes are an integral part of these consolidated financial statements.

3

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (UNAUDITED) (in thousands, except share and per share data)
	Common Stock		Paid In Capital		Retained Earnings			Treasury Stock			Accumulated Other Comprehensive Income (Loss)			Total Shareholders’ Equity
Balance at December 31, 2016	$	39,320	$	535,240	$	30,098		$	(47,891	)	$	(38,493	)	$	518,274
Net income	—		—		43,981			—			—			43,981
Other comprehensive income	—		—		—			—			12,256			12,256
Issuance of common stock for dividend reinvestment plan (33,000 shares)	41		1,057		—			—			—			1,098
Stock compensation expense	—		1,393		—			—			—			1,393
Net issuance of common stock under employee stock plans (138,035 shares)	61		1,802		(73		)	600			—			2,390
Cash dividends paid on common stock ($0.81 per share)	—		—		(23,369		)	—			—			(23,369		)
Stock dividend declared (719,515 shares)	899		24,061		(24,960		)	—			—			—
Balance at September 30, 2017	$	40,321	$	563,553	$	25,677		$	(47,291	)	$	(26,237	)	$	556,023
Balance at December 31, 2017	$	47,253	$	757,439	$	32,851		$	(47,105	)	$	(36,298	)	$	754,140
Net income	—		—		56,757			—			—			56,757
Other comprehensive loss	—		—		—			—			(32,693		)	(32,693		)
Issuance of common stock for dividend reinvestment plan (30,637 shares)	38		1,051		—			—			—			1,089
Stock compensation expense	—		1,626		—			—			—			1,626
Net issuance of common stock under employee stock plans (128,969 shares)	—		1,478		(87		)	1,139			—			2,530
Cash dividends paid on common stock ($0.88 per share)	—		—		(30,858		)	—			—			(30,858		)
Cumulative effect of ASU 2016-01	—		—		(85		)	—			—			(85		)
Balance at September 30, 2018	$	47,291	$	761,594	$	58,578		$	(45,966	)	$	(68,991	)	$	752,506

The accompanying notes are an integral part of these consolidated financial statements.

4

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOW (UNAUDITED) (in thousands)
	Nine Months Ended
	September 30,
	2018			2017
OPERATING ACTIVITIES:
Net income	$	56,757		$	43,981
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	10,571			7,251
Securities premium amortization (discount accretion), net	10,875			13,502
Loan (discount accretion) premium amortization, net	(2,021		)	(818		)
Provision for loan losses	5,991			3,404
Stock compensation expense	1,626			1,393
Deferred tax expense	4,535			453
Net loss (gain) on sale of securities available for sale	1,900			(874		)
Net loss on premises and equipment	379			77
Gross proceeds from sales of loans held for sale	19,612			50,689
Gross originations of loans held for sale	(18,565		)	(45,225		)
Net loss (gain) on other real estate owned	411			(1		)
Net gain on sale of customer receivables	(124		)	—
Net change in:
Interest receivable	6,035			6,391
Other assets	(1,672		)	2,696
Interest payable	(839		)	(923		)
Other liabilities	7,639			(4,639		)
Net cash provided by operating activities	103,110			77,357
INVESTING ACTIVITIES:
Securities available for sale:
Purchases	(228,281		)	(371,555		)
Sales	394,232			486,460
Maturities, calls and principal repayments	122,135			87,096
Securities held to maturity:
Purchases	—			(1,521		)
Maturities, calls and principal repayments	2,656			25,455
Proceeds from redemption of FHLB stock and other investments	24,360			114
Purchases of FHLB stock and other investments	(1,174		)	(761		)
Net loan paydowns (originations)	15,892			(127,240		)
Proceeds from sales of customer receivables	4,300			—
Purchases of premises and equipment	(8,863		)	(7,090		)
Proceeds from sales of premises and equipment	1,905			8
Proceeds from sales of other real estate owned	771			134
Proceeds from sales of repossessed assets	378			341
Net cash provided by investing activities	328,311			91,441
(continued)

5

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOW (UNAUDITED) (continued) (in thousands)
	Nine Months Ended
	September 30,
	2018			2017
FINANCING ACTIVITIES:
Net change in deposits	$	27,809		$	31,031
Net (decrease) increase in federal funds purchased and repurchase agreements	(523		)	1,986
Proceeds from FHLB borrowings	2,569,000			2,366,476
Repayment of FHLB borrowings	(3,025,088		)	(2,533,551		)
Proceeds from stock option exercises	2,655			2,527
Cash paid to tax authority related to tax withholding on share-based awards	(125		)	(137		)
Proceeds from the issuance of common stock for dividend reinvestment plan	1,089			1,098
Cash dividends paid	(30,858		)	(23,369		)
Net cash used in financing activities	(456,041		)	(153,939		)
Net (decrease) increase in cash and cash equivalents	(24,620		)	14,859
Cash and cash equivalents at beginning of period	198,692			169,654
Cash and cash equivalents at end of period	$	174,072		$	184,513
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	$	42,209		$	32,629
Income taxes paid	$	2,000		$	8,300
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	$	1,220		$	407
Loans transferred from portfolio to held for sale	$	3,984		$	—
Transfer of held to maturity securities to available for sale securities	$	743,421		$	—
Adjustment to pension liability	$	1,637		$	(1,205	)
Stock dividend (2.5% for 2017)	$	—		$	24,960
Unsettled trades to purchase securities	$	(28,662	)	$	(16,673	)
Unsettled trades to sell securities	$	14,602		$	11,843
Unsettled issuances of brokered CDs	$	10,000		$	—

The accompanying notes are an integral part of these consolidated financial statements.

6

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.    Summary of Significant Accounting and Reporting Policies

Basis of Presentation

In this report, the words “the Company,” “we,” “us,” and “our” refer to the combined entities of Southside Bancshares, Inc. and its subsidiaries.  The words “Southside” and “Southside Bancshares” refer to Southside Bancshares, Inc.  The words “Southside Bank” and “the Bank” refer to Southside Bank. “Omni” refers to OmniAmerican Bancorp, Inc., a bank holding company, and its wholly-owned subsidiary, OmniAmerican Bank, acquired by Southside on December 17, 2014. “Diboll” refers to Diboll State Bancshares, Inc., a bank holding company and its wholly-owned subsidiary, First Bank & Trust East Texas, acquired by Southside on November 30, 2017.

The accompanying unaudited consolidated financial statements have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, not all information required by GAAP for complete financial statements is included in these interim statements. In the opinion of management, all adjustments necessary for a fair presentation of such financial statements have been included.  Such adjustments consisted only of normal recurring items.  The preparation of these consolidated financial statements in accordance with GAAP requires the use of management’s estimates.  These estimates are subjective in nature and involve matters of judgment.  Actual amounts could differ from these estimates.

Interim results are not necessarily indicative of results for a full year.  These financial statements should be read in conjunction with the financial statements and notes thereto in our Annual Report on Form 10-K for the year ended December 31, 2017.  

Accounting Changes and Reclassifications

Certain prior period amounts have been reclassified to conform to current year presentation.

We adopted Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers (Topic 606)” as modified by subsequently issued ASUs 2015-14, 2016-08, 2016-10, 2016-12 and 2016-20, on January 1, 2018, the effective date of the guidance, using the modified retrospective approach. As the majority of the Company’s revenues are not subject to the new guidance, the adoption of ASU 2014-09 did not have a material impact on the Company’s consolidated financial position, results of operations, equity or cash flows. As a result of the guidance, we adjusted the presentation of revenue received from our brokerage services, merchant services, as well as our interchange income associated with debit card services, which were all deemed to be services offered in an agent capacity. These lines of revenue will now be presented on a net basis with the fee income disclosed net of the related costs in the noninterest income section of the consolidated statements of income. In connection with the adoption, for the three and nine months ended September 30, 2018, we netted $1.0 million and $2.8 million of debit card expense against deposit services income and $172,000 and $474,000 of brokerage services expense against brokerage services income, respectively. Due to the implementation of the guidance under the modified retrospective method, prior periods have not been adjusted and are not comparative. Refer to our revenue recognition discussion below and “Note 1 - Summary of Significant Accounting and Reporting Policies” in our Annual Report on Form 10-K for the year ended December 31, 2017 for more information related to our revenue recognition policies.

We adopted ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities,” on January 1, 2018, the effective date of the guidance.  ASU 2016-01, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale (“AFS”) securities in combination with the entity’s other deferred tax assets. The guidance requires companies to apply the requirements in the year of adoption, through cumulative adjustment, while the guidance related to equity securities without readily determinable fair values should be applied prospectively. Adoption of this guidance resulted in a cumulative adjustment to retained earnings of $85,000, net of tax, on January 1, 2018 and an equity security with a carrying value of $5.9 million that was previously recognized in securities AFS, at estimated fair value

7

on our consolidated balance sheet to instead be recognized in equity investments, with subsequent changes in fair value being recognized in income. Also in conjunction with the adoption, our fair value measurement of financial instruments will be based upon an exit price notion as required in ASC 820.  The guidance was applied on a prospective approach resulting in prior periods no longer being comparable.

We adopted ASU 2017-07, “Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” on January 1, 2018. ASU 2017-07 requires employers to present the service cost component of net periodic postretirement benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. Employers are required to present the other components of the net periodic benefit cost separately from the line item that includes the service cost and outside of any subtotal of operating income, if one is presented. The guidance requires companies to apply the requirements retrospectively to all prior periods presented. We elected to use the practical expedient that permits us to use the amounts in our pension plan disclosures in our employee benefit footnote for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements, which resulted in an increase of $77,000 and $234,000 in salaries and employee benefits expense and a decrease of $77,000 and $234,000 in other noninterest expense for the three and nine months ended September 30, 2017, respectively.

We early adopted ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” on January 1, 2018. ASU 2017-12 (i) expands hedge accounting for nonfinancial and financial risk components and amends measurement methodologies to more closely align hedge accounting with a company’s risk management activities, (ii) decreases the complexity of preparing and understanding hedge results by eliminating the separate measurement and reporting of hedge ineffectiveness, (iii) enhances transparency, comparability and understanding of hedge results through enhanced disclosures and changing the presentation of hedge results to align the effects of the hedging instrument and the hedged item and (iv) reduces the cost and complexity of applying hedge accounting by simplifying the manner in which assessments of hedge effectiveness may be performed. The guidance also permits a transition election to reclassify held to maturity (“HTM”) securities to AFS securities if a portion of those securities would qualify to be hedged under the new “last-of-layer” approach. The guidance requires companies to apply the requirements to existing hedging relationships on the date of adoption, and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The guidance did not have an impact on our derivatives that qualified as hedges on the date of adoption and thus no adjustment was made to retained earnings. In conjunction with the adoption of ASU 2017-12, we made the transition election to reclassify approximately $743.4 million in book value of securities from HTM to AFS that qualified for the last-of-layer method described in ASU 2017-12.

During the second quarter of 2018, we entered into partial term fair value hedges, as allowed under the recently adopted ASU 2017-12, for certain of our fixed rate callable AFS municipal securities. These hedges are expected to be effective in offsetting changes in the fair value of the hedged securities. Gains and losses on derivative instruments designated as fair value hedges, as well as the change in fair value on the hedged item, are recorded in interest income in the consolidated statements of income.

Revenue Recognition

Our revenue consists of net interest income on financial assets and financial liabilities and noninterest income.  The classifications of our revenue are presented in the consolidated statements of income. On January 1, 2018, we adopted ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)” using the modified retrospective method. The revenue recognition principle in ASU 2014-09 is that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.

ASU 2014-09 permits an entity to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset would have been one year or less. We generally expense sales commissions when incurred because the amortization period is within one year or less. These costs are recorded within salaries and employee benefits on the consolidated statements of income.

Revenue is recognized when obligations under the terms of a contract with our customer are satisfied; generally this occurs with the transfer of control of goods or services. Under ASU 2014-09’s practical expedient to recognize revenue equal to the amounts for which we have a right to invoice, revenue is measured as the amount of consideration we expect to receive in exchange for the transfer of those goods or services.

The following summarizes our revenue recognition policies as they relate to revenue from contracts with customers under ASU 2014-09:

• Deposit services. Service charges on deposit accounts include fees for banking services provided, overdrafts and non-sufficient funds. Revenue is generally recognized in accordance with published deposit account agreements for retail accounts or contractual agreements for commercial accounts. Our deposit services also include our ATM and debit card interchange revenue that is presented net of the associated costs. Interchange revenue is generated by our deposit customers’ usage and volume of activity. Interchange rates are not controlled by the Company, which effectively acts as processor that collects and remits payments associated with customer debit card transactions.

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• Trust income. Trust income includes fees and commissions from investment management, administrative and advisory services primarily for individuals, and to a lesser extent, partnerships and corporations. Revenue is recognized on an accrual basis at the time the services are performed and when we have a right to invoice and are based on either the market value of the assets managed or the services provided.

• Brokerage services. Brokerage services income includes fees and commissions charged when we arrange for another party to transfer brokerage services to a customer. The fees and commissions under this agent relationship are based upon stated fee schedules based upon the type of transaction, volume and value of the services provided.

• Other noninterest income. Other noninterest income includes among other things, merchant services income. Merchant services revenue is derived from third party vendors that process credit card transactions on behalf of our merchant customers. Merchant services revenue is primarily comprised of residual fee income based on the referred merchant’s processing volumes and/or margin.

Securities

Available for Sale (“AFS”).  Debt securities that will be held for indefinite periods of time, including securities that may be sold in response to changes in market interest or prepayment rates, needs for liquidity and changes in the availability of and the yield on alternative investments are classified as AFS.  These assets are carried at fair value with changes recorded in other comprehensive income.  Fair value is determined using quoted market prices as of the close of business on the balance sheet date.  If quoted market prices are not available, fair values are based on quoted market prices for similar securities or estimates from independent pricing services. Securities that are hedged with qualifying derivatives are carried at fair value with the change in fair value on both the hedged instrument and the securities recorded in interest income in the consolidated statements of income.

Held to Maturity (“HTM”). Debt securities that management has the positive intent and ability to hold until maturity are classified as HTM and are carried at their remaining unpaid principal balance, net of unamortized premiums or unaccreted discounts.

Equity Investments. Beginning January 1, 2018, upon adoption of ASU 2016-01, equity investments with readily determinable fair values are stated at fair value with unrealized gains and losses reported in income. For periods prior to January 1, 2018, certain equity investments were classified as AFS and stated at fair value with unrealized gains and losses reported as a separate component of accumulated other comprehensive income (“AOCI”), net of tax. Equity investments without readily determinable fair values are recorded at cost less impairment, if any.

Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 requires a lessee to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP which requires only capital leases to be recognized on the balance sheet, the new ASU 2016-02 will require both finance (formerly known as “capital”) and operating leases to be recognized on the balance sheet. ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The guidance originally required companies to apply the requirements in the year of adoption using a modified retrospective approach; however, in July 2018, the FASB issued ASU 2018-11 “Leases (Topic 842): Targeted Improvements,” which provides lessees the option to apply the new leasing standard by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We plan to select this transition option. We are currently evaluating the impact this guidance will have on our consolidated financial statements, and we anticipate our assessment to be completed during the fiscal year 2018. 

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. ASU 2016-13 also modifies the impairment model for AFS debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. ASU 2016-13 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The guidance requires companies to apply the requirements in the year of adoption through cumulative adjustment with some aspects of the update requiring a prospective transition approach. We are currently evaluating the potential impact of the pending adoption of ASU 2016-13 on our consolidated financial statements. We plan to adopt on January 1, 2020, the effective date. We have developed a project plan and have assigned a project team to complete the analysis needed to implement the guidance. The team is currently completing the data collection and anticipates running parallel models in early 2019.

In January 2017, the FASB issued ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 is intended to simplify goodwill impairment testing by eliminating the second step of the analysis which requires the calculation of the implied fair value of goodwill to measure a goodwill impairment charge. The update requires entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount

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by which the carrying amount exceeds the reporting unit’s fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective for annual and interim goodwill impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The guidance requires companies to apply the requirements prospectively in the year of adoption. ASU 2017-04 is not expected to have a significant impact on our consolidated financial statements.

In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” Under current GAAP, premiums on callable debt securities are generally amortized over the contractual life of the security. ASU 2017-08 requires the premium on callable debt securities to be amortized to the earliest call date. If the debt security is not called at the earliest call date, the holder of the debt security would be required to reset the effective yield on the debt security based on the payment terms required by the debt security. ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. We have elected to adopt on January 1, 2019. The guidance requires companies to apply the requirements on a modified retrospective basis through a cumulative adjustment directly to retained earnings as of the beginning of the period of adoption. We have evaluated an estimate of the potential impact of the pending adoption of ASU 2017-08 on our consolidated financial statements. Based on our existing municipal securities portfolio, the preliminary estimate of amortizing premiums to the earliest call date will increase amortization expense recorded through interest income for the year ended December 31, 2019 by approximately $2.9 million. Our preliminary estimate of the cumulative adjustment to retained earnings, at the date of adoption, is estimated to reduce retained earnings by $14.4 million, before tax.

2.Acquisition

On November 30, 2017, we acquired 100% of the outstanding stock of Diboll State Bancshares, Inc. and its wholly-owned subsidiary First Bank & Trust East Texas (collectively, “Diboll”), headquartered in Diboll, Texas. Diboll operated 17 banking offices in Diboll and surrounding areas. We acquired Diboll to further expand our presence in the East Texas market. The operations of Diboll were merged into the Company as of the date of the acquisition.

The Diboll acquisition was accounted for using the acquisition method of accounting and accordingly, purchased assets, including identifiable intangible assets and assumed liabilities were recorded at their respective acquisition date fair values.  The purchase price allocation is preliminary and is subject to final determination and valuation of the fair value of assets acquired and liabilities assumed. Subsequent to filing our Annual Report on Form 10-K for the year ended December 31, 2017, we continue to evaluate the assets and liabilities assumed. This evaluation has resulted in an immaterial adjustment to goodwill at September 30, 2018, based on the filing of the short-period Federal Income Tax return for Diboll and its subsidiaries. The impact of the adjustments to goodwill, net of deferred tax, is reflected below. For more information concerning the fair value of the assets acquired and liabilities assumed in relation to the acquisition of Diboll, see “Note 2 - Acquisition” in our Annual Report on Form 10-K for the year ended December 31, 2017.

The following table reflects the changes in the carrying amount of goodwill for the three months ended September 30, 2018 (in thousands):

	Goodwill
Balance as of December 31, 2017	$	201,246
Less: measurement period adjustments	(130		)
Balance as of September 30, 2018	$	201,116

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3.     Earnings Per Share

Earnings per share on a basic and diluted basis are calculated as follows (in thousands, except per share amounts).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Basic and Diluted Earnings:
Net income	$	20,303	$	14,511	$	56,757	$	43,981
Basic weighted-average shares outstanding	35,114		29,370		35,066		29,326
Add:   Stock awards	174		200		175		205
Diluted weighted-average shares outstanding	35,288		29,570		35,241		29,531
Basic Earnings Per Share:
Net Income	$	0.58	$	0.49	$	1.62	$	1.50
Diluted Earnings Per Share:
Net Income	$	0.58	$	0.49	$	1.61	$	1.49

For the three- and nine-month periods ended September 30, 2018, there were approximately 84,000 and 61,000 anti-dilutive shares, respectively. For the three- and nine-month periods ended September 30, 2017, there were approximately 45,000 and 49,000 anti-dilutive shares, respectively.

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4.     Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive income (loss) by component are as follows (in thousands):

	Three Months Ended September 30, 2018
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(42,536	)	$	10,753		$	(135	)	$	(25,404	)	$	(57,322	)
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(16,885		)	1,894			—			—			(14,991		)
Reclassified from accumulated other comprehensive income	80			(406		)	(1		)	547			220
Income tax benefit (expense)	3,529			(312		)	—			(115		)	3,102
Net current-period other comprehensive (loss) income, net of tax	(13,276		)	1,176			(1		)	432			(11,669		)
Ending balance, net of tax	$	(55,812	)	$	11,929		$	(136	)	$	(24,972	)	$	(68,991	)
	Nine Months Ended September 30, 2018
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior Service (Cost) Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(16,295	)	$	6,399		$	(133	)	$	(26,269	)	$	(36,298	)
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(52,757		)	7,864			—			—			(44,893		)
Reclassified from accumulated other comprehensive income (1)	2,736			(864		)	(5		)	1,642			3,509
Income tax benefit (expense)	10,504			(1,470		)	2			(345		)	8,691
Net current-period other comprehensive (loss) income, net of tax	(39,517		)	5,530			(3		)	1,297			(32,693		)
Ending balance, net of tax	$	(55,812	)	$	11,929		$	(136	)	$	(24,972	)	$	(68,991	)

(1) As discussed in “Note 1 – Summary of Significant Accounting and Reporting Policies,” the Company adopted ASU 2016-01 on January 1, 2018. This amount includes a reclassification for the cumulative adjustment to retained earnings of $107,000 ($85,000, net of tax).

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	Three Months Ended September 30, 2017
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(11,644	)	$	3,957		$	(136	)	$	(18,722	)	$	(26,545	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	344			(236		)	—			—			108
Reclassified from accumulated other comprehensive income	(137		)	101			(1		)	403			366
Income tax (expense) benefit	(72		)	47			—			(141		)	(166		)
Net current-period other comprehensive income (loss), net of tax	135			(88		)	(1		)	262			308
Ending balance, net of tax	$	(11,509	)	$	3,869		$	(137	)	$	(18,460	)	$	(26,237	)
	Nine Months Ended September 30, 2017
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(23,708	)	$	4,595		$	(133	)	$	(19,247	)	$	(38,493	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	18,450			(1,811		)	—			—			16,639
Reclassified from accumulated other comprehensive income	317			694			(5		)	1,210			2,216
Income tax (expense) benefit	(6,568		)	391			1			(423		)	(6,599		)
Net current-period other comprehensive income (loss), net of tax	12,199			(726		)	(4		)	787			12,256
Ending balance, net of tax	$	(11,509	)	$	3,869		$	(137	)	$	(18,460	)	$	(26,237	)

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The reclassifications out of accumulated other comprehensive income (loss) into net income are presented below (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Unrealized losses on securities transferred:
Amortization of unrealized losses (1)	$	661		$	(490	)	$	(729	)	$	(1,191	)
Tax (expense) benefit	(139		)	172			153			417
Net of tax	$	522		$	(318	)	$	(576	)	$	(774	)
Unrealized gains and losses on available for sale securities:
Realized net (loss) gain on sale of securities (2)	$	(741	)	$	627		$	(1,900	)	$	874
Tax benefit (expense)	156			(220		)	399			(306		)
Net of tax	$	(585	)	$	407		$	(1,501	)	$	568
Derivatives:
Realized net gain (loss) on interest rate swap derivatives (3)	$	384		$	(122	)	$	799		$	(746	)
Tax (expense) benefit	(81		)	43			(168		)	261
Net of tax	$	303		$	(79	)	$	631		$	(485	)
Amortization of unrealized gains on terminated interest rate swap derivatives (3)	$	22		$	21		$	65		$	52
Tax expense	(5		)	(7		)	(14		)	(18		)
Net of tax	$	17		$	14		$	51		$	34
Amortization of pension plan:
Net actuarial loss (4)	$	(547	)	$	(403	)	$	(1,642	)	$	(1,210	)
Prior service credit (4)	1			1			5			5
Total before tax	(546		)	(402		)	(1,637		)	(1,205		)
Tax benefit	115			141			343			422
Net of tax	(431		)	(261		)	(1,294		)	(783		)
Total reclassifications for the period, net of tax	$	(174	)	$	(237	)	$	(2,689	)	$	(1,440	)

(1)    Included in interest income on the consolidated statements of income.

(2)    Listed as net (loss) gain on sale of securities available for sale on the consolidated statements of income.

(3)    Included in interest expense for FHLB borrowings on the consolidated statements of income.

(4) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 8 - Employee Benefit Plans.”

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5.     Securities

Debt securities

The amortized cost, gross unrealized gains and losses and estimated fair value of investment and mortgage-backed securities available for sale and held to maturity as of September 30, 2018 and December 31, 2017 are reflected in the tables below (in thousands):

	September 30, 2018
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment Securities:
U.S. Treasury	$	19,706	$	42	$	—	$	19,748
State and Political Subdivisions	718,237		4,666		23,834		699,069
Other Stocks and Bonds	3,000		27		—		3,027
Mortgage-backed Securities: (1)
Residential	708,137		1,997		22,536		687,598
Commercial	544,993		244		15,402		529,835
Total	$	1,994,073	$	6,976	$	61,772	$	1,939,277
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	3,087	$	—	$	57	$	3,030
Mortgage-backed Securities: (1)
Residential	59,679		143		3,015		56,807
Commercial	100,599		65		4,029		96,635
Total	$	163,365	$	208	$	7,101	$	156,472

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	December 31, 2017
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment Securities:
U.S. Government Agency Debentures	$	108,869	$	—	$	—	$	108,869
State and Political Subdivisions	392,760		3,895		3,991		392,664
Other Stocks and Bonds	5,024		31		—		5,055
Other Equity Securities (2)	6,027		—		107		5,920
Mortgage-backed Securities: (1)
Residential	720,930		4,476		7,377		718,029
Commercial	308,357		761		900		308,218
Total	$	1,541,967	$	9,163	$	12,375	$	1,538,755
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	413,632	$	10,879	$	2,583	$	421,928
Mortgage-backed Securities: (1)
Residential	129,044		1,631		239		130,436
Commercial	366,830		3,812		1,206		369,436
Total	$	909,506	$	16,322	$	4,028	$	921,800

(1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(2) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

From time to time, we have transferred securities from AFS to HTM due to overall balance sheet strategies. The remaining net unamortized, unrealized loss on the transferred securities included in AOCI in the accompanying balance sheets totaled $15.8 million ($12.5 million, net of tax) at September 30, 2018 and $17.4 million ($13.8 million, net of tax) at December 31, 2017. Any net unrealized gain or loss on the transferred securities included in AOCI at the time of transfer will be amortized over the remaining life of the underlying security as an adjustment to the yield on those securities. Securities transferred with losses included in AOCI continue to be included in management’s assessment for other-than-temporary impairment for each individual security. There were no securities transferred from AFS to HTM during the nine months ended September 30, 2018 or the year ended December 31, 2017.

On January 1, 2018, we early-adopted ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” and in conjunction with the adoption took the one-time transition election to reclassify approximately $743.4 million book value of securities from HTM to AFS that qualified for hedging under the last-of-layer approach. The unrealized gain of $11.9 million ($9.4 million, net of tax) on the transferred securities was recognized in other comprehensive income on the date of transfer.

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The following tables represent the estimated fair value and unrealized loss on investment and mortgage-backed securities AFS and HTM as of September 30, 2018 and December 31, 2017 (in thousands):

	As of September 30, 2018
	Less Than 12 Months				More Than 12 Months				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
AVAILABLE FOR SALE
Investment Securities:
State and Political Subdivisions	$	287,571	$	7,728	$	244,510	$	16,106	$	532,081	$	23,834
Mortgage-backed Securities:
Residential	332,230		8,003		285,356		14,533		617,586		22,536
Commercial	415,196		12,991		45,485		2,411		460,681		15,402
Total	$	1,034,997	$	28,722	$	575,351	$	33,050	$	1,610,348	$	61,772
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	1,761	$	23	$	1,269	$	34	$	3,030	$	57
Mortgage-backed Securities:
Residential	48,022		2,473		6,781		542		54,803		3,015
Commercial	50,276		1,578		37,995		2,451		88,271		4,029
Total	$	100,059	$	4,074	$	46,045	$	3,027	$	146,104	$	7,101
	As of December 31, 2017
	Less Than 12 Months				More Than 12 Months				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
AVAILABLE FOR SALE
Investment Securities:
State and Political Subdivisions	$	32,341	$	121	$	172,006	$	3,870	$	204,347	$	3,991
Other Equity Securities (1)	5,920		107		—		—		5,920		107
Mortgage-backed Securities:
Residential	429,742		3,232		102,973		4,145		532,715		7,377
Commercial	146,796		419		13,134		481		159,930		900
Total	$	614,799	$	3,879	$	288,113	$	8,496	$	902,912	$	12,375
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	85,608	$	807	$	56,736	$	1,776	$	142,344	$	2,583
Mortgage-backed Securities:
Residential	24,707		157		2,736		82		27,443		239
Commercial	136,491		782		13,552		424		150,043		1,206
Total	$	246,806	$	1,746	$	73,024	$	2,282	$	319,830	$	4,028

(1) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

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We review those securities in an unrealized loss position for significant differences between fair value and the cost basis to evaluate if a classification of other-than-temporary impairment is warranted. In estimating other-than-temporary impairment losses, management considers, among other things, the length of time and the extent to which the fair value has been less than cost and the financial condition and near-term prospects of the issuer. We consider an other-than-temporary impairment to have occurred when there is an adverse change in expected cash flows. When it is determined that a decline in fair value of AFS and HTM securities is other-than-temporary, the carrying value of the security is reduced to its estimated fair value, with a corresponding charge to earnings for the credit portion and a charge to other comprehensive income for the noncredit portion. Based upon the length of time and the extent to which fair value is less than cost, we believe that none of the securities with an unrealized loss have other-than-temporary impairment at September 30, 2018.

The majority of the securities in an unrealized loss position are highly rated Texas municipal securities and U.S. Agency mortgage-backed securities (“MBS”) where the unrealized loss is a direct result of the change in interest rates and spreads. For those securities in an unrealized loss position, we do not currently intend to sell the securities and it is not more likely than not that we will be required to sell the securities before the anticipated recovery of their amortized cost basis. To the best of management’s knowledge and based on our consideration of the qualitative factors associated with each security, there were no securities in our investment and MBS portfolio with an other-than-temporary impairment at September 30, 2018.

The following tables reflect interest income recognized on securities for the periods presented (in thousands):

	Three Months Ended September 30,
	2018		2017
U.S. Treasury	$	10	$	—
U.S. Government Agency Debentures	—		—
State and Political Subdivisions	6,331		5,670
Other Stocks and Bonds	26		27
Other Equity Securities	—		31
Mortgage-backed Securities	10,086		10,567
Total interest income on securities	$	16,453	$	16,295

	Nine Months Ended September 30,
	2018		2017
U.S. Treasury	$	141	$	519
U.S. Government Agency Debentures	89		—
State and Political Subdivisions	19,065		18,381
Other Stocks and Bonds	84		96
Other Equity Securities (1)	—		87
Mortgage-backed Securities	31,190		31,430
Total interest income on securities	$	50,569	$	50,513

(1) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

Of the $1.9 million in net securities loss from the AFS portfolio for the nine months ended September 30, 2018, there were $1.9 million in realized gains and $3.8 million in realized losses.  Of the $874,000 in net securities gains from the AFS portfolio for the nine months ended September 30, 2017, there were $4.7 million in realized gains and $3.8 million in realized losses. There were no sales from the HTM portfolio during the nine months ended September 30, 2018 or 2017. We calculate realized gains and losses on sales of securities under the specific identification method.  

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The amortized cost and estimated fair value of AFS and HTM securities at September 30, 2018, are presented below by contractual maturity (in thousands).  Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations.  MBS are presented in total by category due to the fact that MBS typically are issued with stated principal amounts, and the securities are backed by pools of mortgages that have loans with varying maturities.  The characteristics of the underlying pool of mortgages, such as fixed-rate or adjustable-rate, as well as prepayment risk, are passed on to the security holder.  The term of a mortgage-backed pass-through security thus approximates the term of the underlying mortgages and can vary significantly due to prepayments.

	September 30, 2018
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment Securities:
Due in one year or less	$	3,557	$	3,616
Due after one year through five years	49,413		50,431
Due after five years through ten years	183,420		181,041
Due after ten years	504,553		486,756
	740,943		721,844
Mortgage-backed Securities	1,253,130		1,217,433
Total	$	1,994,073	$	1,939,277

	September 30, 2018
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment Securities:
Due in one year or less	$	115	$	115
Due after one year through five years	1,700		1,670
Due after five years through ten years	1,272		1,245
Due after ten years	—		—
	3,087		3,030
Mortgage-backed Securities:	160,278		153,442
Total	$	163,365	$	156,472

Investment securities and MBS with carrying values of $1.15 billion and $1.24 billion were pledged as of September 30, 2018 and December 31, 2017, respectively. Pledged securities may be used to collateralize one or more of the following: Federal Home Loan Bank of Dallas (“FHLB”) borrowings, repurchase agreements and public funds or for other purposes as required by law.

Equity Investments

Equity investments on our consolidated balance sheet include Community Reinvestment Act funds with a readily determinable fair value as well as equity investments without readily determinable fair values. At September 30, 2018, we had equity investments recorded in our consolidated balance sheet of $12.0 million. At December 31, 2017, we had $5.8 million in equity investments without readily determinable fair values recorded at cost.

Beginning January 1, 2018, upon adoption of ASU 2016-01, equity investments with readily determinable fair values are stated at fair value with realized and unrealized gains and losses reported in income. For periods prior to January 1, 2018, these equity investments were classified as AFS and stated at fair value with unrealized gains and losses reported as a separate component of AOCI, net of tax. Equity investments without readily determinable fair values are recorded at cost less any impairment, if any.

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At December 31, 2017, we had $5.9 million in equity investments included in AFS securities and recorded at fair value, with net unrealized losses of $85,000, net of tax, recognized in AOCI. On January 1, 2018, these unrealized losses were reclassified out of AOCI and into retained earnings with subsequent changes in fair value being recognized in net income. The following is a summary of unrealized and realized gains and losses recognized in net income on equity investments during the three and nine months ended September 30, 2018 (in thousands):

	Three Months Ended			Nine Months Ended
	September 30, 2018			September 30, 2018
Net (losses) recognized during the period on equity investments	$	(42	)	$	(176	)
Less: Net gains and (losses) recognized during the period on equity investments sold during the period	—			—
Unrealized (losses) recognized during the reporting period on equity investments still held at the reporting date	$	(42	)	$	(176	)

Equity investments are assessed quarterly for other-than-temporary impairment. Based upon that evaluation, management does not consider any of our equity investments to be other-than-temporarily impaired at September 30, 2018.

Federal Home Loan Bank Stock

Our FHLB stock, which has limited marketability, is carried at cost.

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6.     Loans and Allowance for Probable Loan Losses

Loans in the accompanying consolidated balance sheets are classified as follows (in thousands):

	September 30, 2018		December 31, 2017
Real Estate Loans:
Construction	$	484,254	$	475,867
1-4 Family Residential	791,274		805,341
Commercial	1,218,714		1,265,159
Commercial Loans	322,873		266,422
Municipal Loans	344,792		345,798
Loans to Individuals	112,617		135,769
Total Loans	3,274,524		3,294,356
Less: Allowance for Loan Losses (1)	26,092		20,781
Net Loans	$	3,248,432	$	3,273,575

(1) Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss. The allowance for loan loss recorded on purchase credit impaired (“PCI”) loans totaled $824,000 as ofSeptember 30, 2018. There was no allowance for loan loss recorded on PCI loans as of December 31, 2017.

Real Estate Construction Loans

Our construction loans are collateralized by property located primarily in or near the market areas we serve. A number of our construction loans will be owner occupied upon completion. Construction loans for non-owner occupied projects are financed, but these typically have cash flows from leases with tenants, secondary sources of repayment, and in some cases, additional collateral. Our construction loans have both adjustable and fixed interest rates during the construction period. Construction loans to individuals are typically priced and made with the intention of granting the permanent loan on the property. Speculative and commercial construction loans are subject to underwriting standards similar to that of the commercial portfolio.  Owner occupied 1-4 family residential construction loans are subject to the underwriting standards of the permanent loan.

Real Estate 1-4 Family Residential Loans

Residential loan originations are generated by our loan officers, in-house origination staff, marketing efforts, present customers, walk-in customers and referrals from real estate agents and builders.  We focus our lending efforts primarily on the origination of loans secured by first mortgages on owner occupied 1-4 family residences.  Substantially all of our 1-4 family residential originations are secured by properties located in or near our market areas.  

Our 1-4 family residential loans generally have maturities ranging from five to 30 years.  These loans are typically fully amortizing with monthly payments sufficient to repay the total amount of the loan.  Our 1-4 family residential loans are made at both fixed and adjustable interest rates.

Underwriting for 1-4 family residential loans includes debt-to-income analysis, credit history analysis, appraised value and down payment considerations. Changes in the market value of real estate can affect the potential losses in the portfolio.

Commercial Real Estate Loans

Commercial real estate loans as of September 30, 2018 consisted of $1.11 billion of owner and non-owner occupied real estate, $87.8 million of loans secured by multi-family properties and $19.4 million of loans secured by farmland. Commercial real estate loans primarily include loans collateralized by retail, commercial office buildings, multi-family residential buildings, medical facilities and offices, senior living, assisted living and skilled nursing facilities, warehouse facilities, hotels and churches. Management does not consider there to be a risk in any one industry type. In determining whether to originate commercial real estate loans, we generally consider such factors as the financial condition of the borrower and the debt service coverage of the property. Commercial real estate loans are made at both fixed and adjustable interest rates for terms generally up to 20 years.

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Commercial Loans

Our commercial loans are diversified loan types including short-term working capital loans for inventory and accounts receivable and short- and medium-term loans for equipment or other business capital expansion.  Management does not consider there to be a concentration of risk in any one industry type. In our commercial loan underwriting, we assess the creditworthiness, ability to repay and the value and liquidity of the collateral being offered.  Terms of commercial loans are generally commensurate with the useful life of the collateral offered.

Municipal Loans

We have a specific lending department that makes loans to municipalities and school districts primarily throughout the state of Texas.  Municipal loans outside the state of Texas have been limited to adjoining states. The majority of the loans to municipalities and school districts have tax or revenue pledges and in some cases are additionally supported by collateral.  Municipal loans made without a direct pledge of taxes or revenues are usually made based on some type of collateral that represents an essential service. 

Loans to Individuals

Substantially all originations of our loans to individuals are made to consumers in our market areas.  The majority of loans to individuals are collateralized by titled equipment, which are primarily automobiles. Loan terms vary according to the type and value of collateral, length of contract and creditworthiness of the borrower.  The underwriting standards we employ for consumer loans include an application, a determination of the applicant’s payment history on other debts, with the greatest weight being given to payment history with us and an assessment of the borrower’s ability to meet existing obligations and payments on the proposed loan.  Although creditworthiness of the applicant is a primary consideration, the underwriting process also includes a comparison of the value of the collateral, if any, in relation to the proposed loan amount. Most of our loans to individuals are collateralized, which management believes assists in limiting our exposure.

Allowance for Loan Losses

The allowance for loan losses is based on the most current review of the loan portfolio and is a result of multiple processes.  First, we utilize historical net charge-off data to establish general reserve amounts for each class of loans. The historical charge-off figure is further adjusted through qualitative factors that include general trends in past dues, nonaccruals and classified loans to more effectively and promptly react to both positive and negative movements not reflected in the historical data. Second, our lenders have the primary responsibility for identifying problem loans based on customer financial stress and underlying collateral.  These recommendations are reviewed by senior loan administration, the special assets department and the loan review department on a monthly basis.  Third, the loan review department independently reviews the portfolio on an annual basis.  The loan review department follows a board-approved annual loan review scope.  The loan review scope encompasses a number of considerations including the size of the loan, the type of credit extended, the seasoning of the loan and the performance of the loan.  The loan review scope, as it relates to size, focuses more on larger dollar loan relationships, typically aggregate debt of $500,000 or greater.  The loan review officer also reviews specific reserves compared to general reserves to determine trends in comparative reserves as well as losses not reserved for prior to charge-off to determine the effectiveness of the specific reserve process.

At each review, a subjective analysis methodology is used to grade the respective loan.  Categories of grading vary in severity from loans that do not appear to have a significant probability of loss at the time of review to loans that indicate a probability that the entire balance of the loan will be uncollectible.  If at the time of review we determine it is probable that we will not collect the principal and interest cash flows contractually due on the loan, estimates of future expected cash flows or appraisals of the collateral securing the debt are used to determine the necessary allowances.  The internal loan review department maintains a list (“Watch List”) of all loans or loan relationships that are graded as having more than the normal degree of risk associated with them. In addition, a list of specifically reserved loans or loan relationships of $150,000 or more is updated on a quarterly basis in order to properly determine necessary allowances and keep management informed on the status of attempts to correct the deficiencies noted with respect to the loan.

We calculate historical loss ratios for pools of loans with similar characteristics based on the proportion of actual charge-offs experienced, consistent with the characteristics of remaining loans, to the total population of loans in the pool. The historical gross loss ratios are updated quarterly based on actual charge-off experience and adjusted for qualitative factors. All loans are subject to individual analysis if determined to be impaired with the exception of consumer loans and loans secured by 1-4 family residential loans.

Industry and our own experience indicates that a portion of our loans will become delinquent and a portion of our loans will require partial or full charge-off.  Regardless of the underwriting criteria utilized, losses may occur as a result of various factors beyond our control, including, among other things, changes in market conditions affecting the value of properties used as collateral for loans and problems affecting the credit worthiness of the borrower and the ability of the borrower to make payments on the

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loan.  Our determination of the appropriateness of the allowance for loan losses is based on various considerations, including an analysis of the risk characteristics of various classifications of loans, previous loan loss experience, specific loans which have loan loss potential, delinquency trends, estimated fair value of the underlying collateral, current economic conditions and geographic and industry loan concentration.

Credit Quality Indicators

We categorize loans into risk categories on an ongoing basis based on relevant information about the ability of borrowers to service their debt such as:  current financial information, historical payment experience, credit documentation, public information and current economic trends, among other factors.  We use the following definitions for risk ratings:

• Pass (Rating 1 – 4) – This rating is assigned to all satisfactory loans.  This category, by definition, consists of acceptable credit.  Credit and collateral exceptions should not be present, although their presence would not necessarily prohibit a loan from being rated Pass, if deficiencies are in the process of correction.  These loans are not included in the Watch List.

• Pass Watch (Rating 5) – These loans require some degree of special treatment, but not due to credit quality.  This category does not include loans specially mentioned or adversely classified; however, particular attention is warranted to characteristics such as:

◦ A lack of, or abnormally extended payment program;

◦ A heavy degree of concentration of collateral without sufficient margin;

◦ A vulnerability to competition through lesser or extensive financial leverage; and

◦ A dependence on a single or few customers or sources of supply and materials without suitable substitutes or alternatives.

• Special Mention (Rating 6) – A Special Mention loan has potential weaknesses that deserve management’s close attention.  If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or in our credit position at some future date.  Special Mention loans are not adversely classified and do not expose us to sufficient risk to warrant adverse classification.

• Substandard (Rating 7) – Substandard loans are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any.  Loans so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt.  They are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected.

• Doubtful (Rating 8) – Loans classified as Doubtful have all the weaknesses inherent in those classified Substandard with the added characteristic that the weaknesses make collection or liquidation, in full, on the basis of currently known facts, conditions and values, highly questionable and improbable.

All accruing loans are reserved for as a group of similar type credits and included in the general portion of the allowance for loan losses. Loans to individuals and 1-4 family residential loans, including loans not accruing, are collectively evaluated and included in the general portion of the allowance for loan losses. All loans considered troubled debt restructurings (“TDR”) are evaluated individually for impairment.

The general portion of the loan loss allowance is reflective of historical charge-off levels for similar loans adjusted for changes in current conditions and other relevant factors.  These factors are likely to cause estimated losses to differ from historical loss experience and include:

• Changes in lending policies or procedures, including underwriting, collection, charge-off and recovery procedures;

• Changes in local, regional and national economic and business conditions, including entry into new markets;

• Changes in the volume or type of credit extended;

• Changes in the experience, ability and depth of lending management;

• Changes in the volume and severity of past due, nonaccrual, restructured, or classified loans;

• Changes in charge-off trends;

• Changes in loan review or Board oversight;

• Changes in the level of concentrations of credit; and

• Changes in external factors, such as competition and legal and regulatory requirements.

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These factors are also considered for the non-PCI loan portfolio specifically in regards to changes in credit quality, past due, nonaccrual and charge-off trends.

The following tables detail activity in the allowance for loan losses by portfolio segment for the periods presented (in thousands):

	Three Months Ended September 30, 2018
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	3,841		$	2,730		$	14,036	$	2,560		$	859	$	1,046		$	25,072
Provision (reversal) for loan losses (2)	(717		)	585			290		533			5		279			975
Loans charged off	—			(8		)	—		(13		)	—		(641		)	(662		)
Recoveries of loans charged off	—			331			5		105			—		266			707
Balance at end of period	$	3,124		$	3,638		$	14,331	$	3,185		$	864	$	950		$	26,092

	Nine Months Ended September 30, 2018
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period (1)	$	3,676		$	2,445		$	10,821	$	2,094		$	860	$	885		$	20,781
Provision (reversal) for loan losses (2)	(538		)	906			3,499		1,194			4		926			5,991
Loans charged off	(14		)	(65		)	—		(270		)	—		(1,997		)	(2,346		)
Recoveries of loans charged off	—			352			11		167			—		1,136			1,666
Balance at end of period	$	3,124		$	3,638		$	14,331	$	3,185		$	864	$	950		$	26,092

	Three Months Ended September 30, 2017
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	3,573		$	2,392		$	9,970	$	1,624		$	765	$	917		$	19,241
Provision (reversal) for loan losses (2)	(20		)	34			383		189			41		333			960
Loans charged off	—			(11		)	—		(73		)	—		(593		)	(677		)
Recoveries of loans charged off	—			10			2		89			—		246			347
Balance at end of period	$	3,553		$	2,425		$	10,355	$	1,829		$	806	$	903		$	19,871

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	Nine Months Ended September 30, 2017
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	4,147		$	2,665		$	7,204	$	2,263		$	750	$	882		$	17,911
Provision (reversal) for loan losses (2)	(560		)	46			3,140		(84		)	56		806			3,404
Loans charged off	(35		)	(299		)	—		(650		)	—		(1,835		)	(2,819		)
Recoveries of loans charged off	1			13			11		300			—		1,050			1,375
Balance at end of period	$	3,553		$	2,425		$	10,355	$	1,829		$	806	$	903		$	19,871

(1) Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss.

(2) Of the $975,000 and $6.0 million recorded in provision for loan losses for the three and nine months ended September 30, 2018, $466,000 and $824,000 related to provision expense on PCI loans, respectively. Of the $960,000 and $3.4 million recorded in provision for loan losses for the three and nine months ended September 30, 2017, $50,000 related to provision expense on PCI loans.

The following tables present the balance in the allowance for loan losses by portfolio segment based on impairment method (in thousands):

	As of September 30, 2018
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Ending balance – individually evaluated for impairment (1)	$	18	$	37	$	5,563	$	340	$	9	$	72	$	6,039
Ending balance – collectively evaluated for impairment	3,106		3,601		8,768		2,845		855		878		20,053
Balance at end of period	$	3,124	$	3,638	$	14,331	$	3,185	$	864	$	950	$	26,092

	As of December 31, 2017
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Ending balance – individually evaluated for impairment (1)	$	12	$	14	$	14	$	252	$	10	$	51	$	353
Ending balance – collectively evaluated for impairment	3,664		2,431		10,807		1,842		850		834		20,428
Balance at end of period	$	3,676	$	2,445	$	10,821	$	2,094	$	860	$	885	$	20,781

(1) The allowance for loan loss on PCI loans totaled $824,000 as of September 30, 2018. There was no allowance for loan losses associated with PCI loans as of December 31, 2017.

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The following tables present the recorded investment in loans by portfolio segment based on impairment method (in thousands):

	September 30, 2018
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Loans individually evaluated for impairment	$	54	$	1,245	$	29,938	$	1,594	$	429	$	168	$	33,428
Loans collectively evaluated for impairment	483,996		778,830		1,167,687		318,726		344,363		111,823		3,205,425
Purchased credit impaired loans	204		11,199		21,089		2,553		—		626		35,671
Total ending loan balance	$	484,254	$	791,274	$	1,218,714	$	322,873	$	344,792	$	112,617	$	3,274,524

	December 31, 2017
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Loans individually evaluated for impairment	$	86	$	1,581	$	895	$	1,429	$	502	$	205	$	4,698
Loans collectively evaluated for impairment	475,505		797,111		1,232,327		259,745		345,296		134,441		3,244,425
Purchased credit impaired loans	276		6,649		31,937		5,248		—		1,123		45,233
Total ending loan balance	$	475,867	$	805,341	$	1,265,159	$	266,422	$	345,798	$	135,769	$	3,294,356

The following tables set forth credit quality indicators by class of loans for the periods presented (in thousands):

	September 30, 2018
	Pass		Pass Watch (1)		Special Mention (1)		Substandard (1)		Doubtful (1)		Total
Real Estate Loans:
Construction	$	483,704	$	382	$	5	$	122	$	41	$	484,254
1-4 Family Residential	782,330		458		553		6,635		1,298		791,274
Commercial	1,086,806		24,346		35,944		69,614		2,004		1,218,714
Commercial Loans	314,422		1,104		4,043		3,030		274		322,873
Municipal Loans	343,504		—		859		429		—		344,792
Loans to Individuals	111,665		15		18		610		309		112,617
Total	$	3,122,431	$	26,305	$	41,422	$	80,440	$	3,926	$	3,274,524

	December 31, 2017
	Pass		Pass Watch (1)		Special Mention (1)		Substandard (1)		Doubtful (1)		Total
Real Estate Loans:
Construction	$	471,446	$	3,329	$	77	$	982	$	33	$	475,867
1-4 Family Residential	796,639		559		857		6,610		676		805,341
Commercial	1,136,576		26,275		25,301		76,625		382		1,265,159
Commercial Loans	247,430		9,625		3,956		5,203		208		266,422
Municipal Loans	344,366		—		930		502		—		345,798
Loans to Individuals	134,694		20		102		707		246		135,769
Total	$	3,131,151	$	39,808	$	31,223	$	90,629	$	1,545	$	3,294,356

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(1) Includes PCI loans comprised of $25,000 pass watch, $2.1 million special mention, $6.1 million substandard and $2.4 doubtful as of September 30, 2018. Includes PCI loans comprised of $362,000 pass watch, $6.0 million special mention, $10.5 million substandard and $925,000 doubtful as of December 31, 2017.

Nonperforming Assets and Past Due Loans

Nonaccrual loans are loans 90 days or more delinquent and collection in full of both the principal and interest is not expected.  Additionally, some loans that are not delinquent or that are delinquent less than 90 days may be placed on nonaccrual status if it is probable that we will not receive contractual principal and interest payments in accordance with the terms of the respective loan agreement. When a loan is categorized as nonaccrual, the accrual of interest is discontinued and any accrued balance is reversed for financial statement purposes.  Payments received on nonaccrual loans are applied to the outstanding principal balance. Payments of contractual interest are recognized as income only to the extent that full recovery of the principal balance of the loan is reasonably certain.  Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.  Other factors, such as the value of collateral securing the loan and the financial condition of the borrower, are considered in judgments as to potential loan loss.

Nonaccrual loans and accruing loans past due more than 90 days include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans.

PCI loans are recorded at fair value at acquisition date. Although the PCI loans may be contractually delinquent, we do not classify these loans as past due or nonperforming when the timing and amount of expected cash flows can be reasonably estimated, as the loans were written down to fair value at the acquisition date and the accretable yield is recognized in interest income over the remaining life of the loan. However, subsequent to acquisition, we re-assess PCI loans for additional impairment and record additional impairment in the event we conclude it is probable that we will be unable to collect all cash flows originally expected to be collected at acquisition plus any additional cash flows expected to be collected due to changes in estimates after acquisition. All such PCI loans for which we recognize subsequent impairment are reported as impaired loans in the financial statements.

The following table sets forth nonperforming assets for the periods presented (in thousands):

	At September 30, 2018		At December 31, 2017
Nonaccrual loans (1)	$	32,526	$	2,937
Accruing loans past due more than 90 days (1)	—		1
Restructured loans (2)	5,699		5,767
Other real estate owned	1,413		1,613
Repossessed assets	—		154
Total Nonperforming Assets	$	39,638	$	10,472

(1) Excludes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated. The increase in nonaccrual loans was primarily the result of the addition of two large commercial real estate relationships consisting of three loans in the first quarter of 2018.

(2) Includes $3.2 million and $2.9 million in PCI loans restructured as of September 30, 2018 and December 31, 2017, respectively.

Foreclosed assets include other real estate owned and repossessed assets. For 1-4 family residential real estate properties, a loan is recognized as a foreclosed property once legal title to the real estate property has been received upon completion of foreclosure or the borrower has conveyed all interest in the residential property through a deed in lieu of foreclosure. There were $232,000 and $154,000 in loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of September 30, 2018 and December 31, 2017, respectively.

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The following table sets forth the recorded investment in nonaccrual loans by class of loans for the periods presented (in thousands). The table excludes PCI loans measured at fair value at acquisition:

	Nonaccrual Loans
	September 30, 2018		December 31, 2017
Real Estate Loans:
Construction	$	55	$	86
1-4 Family Residential	1,399		1,098
Commercial	29,512		595
Commercial Loans	1,153		903
Loans to Individuals	407		255
Total	$	32,526	$	2,937

Loans are considered impaired if, based on current information and events, it is probable we will be unable to collect the scheduled payments of principal and interest when due according to the contractual terms of the loan agreement.  Impairment is evaluated in total for smaller-balance loans of a similar nature and on an individual loan basis for larger loans. The measurement of loss on impaired loans is generally based on the fair value of the collateral less selling costs if repayment is expected solely from the collateral or the present value of the expected future cash flows discounted at the historical effective interest rate stipulated in the loan agreement. In measuring the fair value of the collateral, in addition to relying on third party appraisals, we use assumptions, such as discount rates, and methodologies, such as comparison to the recent selling price of similar assets, consistent with those that would be utilized by unrelated third parties performing a valuation. Loans that are evaluated and determined not to meet the definition of an impaired loan are reserved for at the general reserve rate for its appropriate class.

At the time a loss is probable in the collection of contractual amounts, specific reserves are allocated.  Loans are charged off to the liquidation value of the collateral net of liquidation costs, if any, when deemed uncollectible or as soon as collection by liquidation is evident.

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The following tables set forth impaired loans by class of loans, including the unpaid contractual principal balance, the recorded investment and the allowance for loan losses for the periods presented (in thousands). Impaired loans include restructured and nonaccrual loans for which the allowance was measured in accordance with section 310-10 of ASC Topic 310, “Receivables.” There were no impaired loans recorded without an allowance as of September 30, 2018 or December 31, 2017.

	September 30, 2018
	Unpaid Contractual Principal Balance		Recorded Investment		Related  Allowance for  Loan Losses
Real Estate Loans:
Construction	$	185	$	157	$	18
1-4 Family Residential	4,891		4,559		37
Commercial	33,560		32,267		5,563
Commercial Loans	2,605		2,269		340
Municipal Loans	429		429		9
Loans to Individuals	232		191		72
Total (1)	$	41,902	$	39,872	$	6,039

	December 31, 2017
	Unpaid Contractual Principal Balance		Recorded Investment		Related  Allowance for  Loan Losses
Real Estate Loans:
Construction	$	91	$	86	$	12
1-4 Family Residential	4,141		3,952		14
Commercial	1,353		1,199		14
Commercial Loans	1,665		1,605		252
Municipal Loans	502		502		10
Loans to Individuals	237		205		51
Total (1)	$	7,989	$	7,549	$	353

(1) Includes $6.4 million and $2.9 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date as of September 30, 2018 and December 31, 2017, respectively.

The following tables present the aging of the recorded investment in past due loans by class of loans (in thousands):

	September 30, 2018
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current (1)		Total
Real Estate Loans:
Construction	$	35	$	2,808	$	41	$	2,884	$	481,370	$	484,254
1-4 Family Residential	2,296		2,326		520		5,142		786,132		791,274
Commercial	252		115		123		490		1,218,224		1,218,714
Commercial Loans	1,957		722		420		3,099		319,774		322,873
Municipal Loans	—		—		—		—		344,792		344,792
Loans to Individuals	1,013		229		190		1,432		111,185		112,617
Total	$	5,553	$	6,200	$	1,294	$	13,047	$	3,261,477	$	3,274,524

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	December 31, 2017
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current (1)		Total
Real Estate Loans:
Construction	$	1,302	$	1,530	$	68	$	2,900	$	472,967	$	475,867
1-4 Family Residential	8,508		1,574		862		10,944		794,397		805,341
Commercial	1,357		24		5		1,386		1,263,773		1,265,159
Commercial Loans	662		400		333		1,395		265,027		266,422
Municipal Loans	422		—		—		422		345,376		345,798
Loans to Individuals	1,526		373		93		1,992		133,777		135,769
Total	$	13,777	$	3,901	$	1,361	$	19,039	$	3,275,317	$	3,294,356

(1)    Includes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated.

The following table sets forth average recorded investment and interest income recognized on impaired loans by class of loans for the periods presented (in thousands). The table excludes PCI loans measured at fair value at acquisition that have not experienced further deterioration in credit quality subsequent to the acquisition date:

	Three Months Ended
	September 30, 2018				September 30, 2017
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Real Estate Loans:
Construction	$	252	$	3	$	62	$	—
1-4 Family residential	3,976		49		4,170		26
Commercial	32,580		16		1,459		2
Commercial loans	2,543		21		1,148		28
Municipal loans	466		6		537		7
Loans to Individuals	244		1		250		1
Total	$	40,061	$	96	$	7,626	$	64

	Nine Months Ended
	September 30, 2018				September 30, 2017
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Real Estate Loans:
Construction	$	150	$	4	$	301	$	—
1-4 Family Residential	3,951		138		4,322		134
Commercial	24,149		36		1,368		27
Commercial Loans	2,073		51		3,320		118
Municipal Loans	488		20		558		23
Loans to Individuals	223		3		248		4
Total	$	31,034	$	252	$	10,117	$	306

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Troubled Debt Restructurings

The restructuring of a loan is considered a TDR if both (i) the borrower is experiencing financial difficulties and (ii) the creditor has granted a concession.  Concessions may include interest rate reductions or below market interest rates, restructuring amortization schedules and other actions intended to minimize potential losses. We may provide a combination of concessions which may include an extension of the amortization period, interest rate reduction and/or converting the loan to interest-only for a limited period of time.

The following tables set forth the recorded balance of loans considered to be TDRs that were restructured and the type of concession during the periods presented (dollars in thousands):

	Three Months Ended September 30, 2018
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real Estate Loans:
Commercial	$	—	$	—	$	283	$	283	2
Commercial Loans	142		—		56		198		4
Loans to Individuals	—		35		—		35		1
Total	$	142	$	35	$	339	$	516	7

	Nine Months Ended September 30, 2018
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real Estate Loans:
1-4 Family Residential	$	—	$	80	$	—	$	80	1
Commercial	—		—		283		283		2
Commercial Loans	244		—		135		379		9
Loans to Individuals	8		35		13		56		4
Total	$	252	$	115	$	431	$	798	16

	Three Months Ended September 30, 2017
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Loans to Individuals	$	—	$	—	$	8	$	8	1
Total	$	—	$	—	$	8	$	8	1

	Nine Months Ended September 30, 2017
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Commercial Loans	$	810	$	—	$	—	$	810	3
Loans to Individuals	27		—		56		83		6
Total	$	837	$	—	$	56	$	893	9

The majority of loans restructured as TDRs during the nine months ended September 30, 2018 and 2017 were modified with maturity extensions or a combination of maturity extensions and interest rate reductions. Interest continues to be charged on principal balances outstanding during the extended term. Therefore, the financial effects of the recorded investment of loans restructured as TDRs during the nine months ended September 30, 2018 and 2017 were not significant. Generally, the loans identified as TDRs were previously reported as impaired loans prior to restructuring and therefore the modification did not impact our determination of the allowance for loan losses.

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On an ongoing basis, the performance of the TDRs is monitored for subsequent payment default. Payment default for TDRs is recognized when the borrower is 90 days or more past due. For the three and nine months ended September 30, 2018 and 2017, the amount of TDRs in default was not significant. Payment defaults for TDRs did not significantly impact the determination of the allowance for loan loss in either period presented.

At September 30, 2018 and 2017, there were no commitments to lend additional funds to borrowers whose terms had been modified in TDRs.

Purchased Credit Impaired Loans

The following table presents the outstanding principal balance and carrying value for PCI loans for the periods presented (in thousands):

	September 30, 2018		December 31, 2017
Outstanding principal balance	$	41,094	$	52,426
Carrying amount	$	35,671	$	45,233

The following table presents the changes in the accretable yield during the periods for PCI loans (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	16,105		$	3,758		$	18,721		$	2,480
Changes in expected cash flows not affecting non-accretable differences	—			—			(1,445		)	—
Reclassifications (to) from nonaccretable discount	620			(79		)	1,389			1,735
Accretion	(733		)	(156		)	(2,673		)	(692		)
Balance at end of period	$	15,992		$	3,523		$	15,992		$	3,523

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7. Borrowing Arrangements

Information related to borrowings is provided in the table below (dollars in thousands):

	September 30, 2018			December 31, 2017
Federal funds purchased and repurchase agreements:
Balance at end of period	$	8,975		$	9,498
Average amount outstanding during the period (1) (5)	9,018			8,120
Maximum amount outstanding during the period (2)	8,975			9,498
Weighted average interest rate during the period (3) (5)	1.1		%	0.2		%
Interest rate at end of period (4)	0.8		%	0.2		%
FHLB borrowings:
Balance at end of period	$	561,267		$	1,017,361
Average amount outstanding during the period (1) (5)	757,399			1,222,033
Maximum amount outstanding during the period (2)	957,231			1,414,453
Weighted average interest rate during the period (3) (5)	1.7		%	1.2		%
Interest rate at end of period (4)	2.1		%	1.4		%
Subordinated notes, net of unamortized debt issuance costs:
Balance at end of period	$	98,366		$	98,248
Average amount outstanding during the period (1) (5)	98,307			98,172
Maximum amount outstanding during the period (2)	98,366			98,248
Weighted average interest rate during the period (3) (5)	5.8		%	5.7		%
Interest rate at end of period (4)	5.5		%	5.5		%
Trust preferred subordinated debentures, net of unamortized debt issuance costs:
Balance at end of period	$	60,244		$	60,241
Average amount outstanding during the period (1) (5)	60,242			60,238
Maximum amount outstanding during the period (2)	60,244			60,241
Weighted average interest rate during the period (3) (5)	4.2		%	3.3		%
Interest rate at end of period (4)	4.4		%	3.6		%

(1) The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period.

(2) The maximum amount outstanding at any month-end during the period.

(3) The weighted average interest rate during the period was computed by dividing the actual interest expense (annualized for interim periods) by the average amount outstanding during the period. The weighted average interest rate on the FHLB borrowings includes the effect of interest rate swaps.

(4) Stated rate.

(5) Interim period averages are annualized.

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Maturities of fixed rate obligations based on scheduled repayments at September 30, 2018 are as follows (in thousands):

	Payments Due by Period
	Less than 1 Year		1-2 Years		2-3 Years		3-4 Years		4-5 Years		Thereafter		Total
Federal funds purchased and repurchase agreements	$	8,588	$	387	$	—	$	—	$	—	$	—	$	8,975
FHLB borrowings	158,505		385,165		11,537		—		—		6,060		561,267
Subordinated notes, net of unamortized debt issuance costs	—		—		—		—		—		98,366		98,366
Trust preferred subordinated debentures, net of unamortized debt issuance costs	—		—		—		—		—		60,244		60,244
Total obligations	$	167,093	$	385,552	$	11,537	$	—	$	—	$	164,670	$	728,852

FHLB borrowings represent borrowings with fixed and floating interest rates ranging from 1.37% to 4.799% and with remaining maturities of one day to 9.8 years.  FHLB borrowings may be collateralized by FHLB stock, nonspecified loans and/or securities.

From time to time, the Company may enter into various variable rate advance agreements with the FHLB. These advance agreements totaled $310.0 million at September 30, 2018 and $280.0 millionDecember 31, 2017. Two of the variable rate advance agreements have interest rates of three-month LIBOR plus 0.021%, and one has an interest rate of three-month LIBOR minus 0.003%. The remaining variable rate advance agreements have interest rates ranging from one-month LIBOR plus 0.072% to one-month LIBOR plus 0.164%. In connection with obtaining these variable rate advance agreements, the Company also entered into various interest rate swap contracts that are treated as cash flow hedges under ASC Topic 815, “Derivatives and Hedging” that effectively converted the variable rate advance agreements to fixed interest rates ranging from 0.932% to 2.8325% and original terms ranging from four years to ten years. The cash flows from the swaps are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the one-month and three-month LIBOR interest rates. During the first quarter of 2017, we terminated two interest rate swap contracts designated as cash flow hedges having a total notional value of $40.0 million. At the time of termination, we determined that the underlying hedged forecasted transactions were still probable of occurring. These transactions are reevaluated on a monthly basis to determine if the hedged forecasted transactions are still probable of occurring. If at a subsequent evaluation it is determined that the transactions will not occur, any related gains or losses recorded in AOCI are immediately recognized in earnings. Refer to “Note 10 - Derivative Financial Instruments and Hedging Activities” in our consolidated financial statements included in this report for a detailed description of our hedging policy and methodology related to derivative instruments.

Southside Bank has three unsecured lines of credit for the purchase of overnight federal funds at prevailing rates with Frost Bank, TIB – The Independent Bankers Bank and Comerica Bank for $40.0 million, $15.0 million and $7.5 million, respectively. There were no federal funds purchased at September 30, 2018 or December 31, 2017.  Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit, and at September 30, 2018, we had one outstanding letter of credit for $195,000. At September 30, 2018, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by FHLB stock, nonspecified loans and securities, was approximately $1.25 billion, net of FHLB stock purchases required.  Southside Bank currently has no outstanding letters of credit from FHLB held as collateral for its public fund deposits.

Southside Bank enters into sales of securities under agreements to repurchase (“repurchase agreements”). These repurchase agreements totaled $9.0 million and $9.5 million at September 30, 2018 and December 31, 2017, respectively, and had maturities of less than two years.  These repurchase agreements are secured by investment securities and are stated at the amount of cash received in connection with the transaction.

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8.     Employee Benefit Plans

The components of net periodic benefit cost (income) related to our employee benefit plans are as follows (in thousands):

	Three Months Ended September 30,
	Defined Benefit Pension Plan						Defined Benefit Pension Plan Acquired						Restoration Plan
	2018			2017			2018			2017			2018		2017
Service cost	$	387		$	349		$	—		$	—		$	73	$	61
Interest cost	848			901			41			44			149		142
Expected return on assets	(1,621		)	(1,513		)	(73		)	(53		)	—		—
Net loss amortization	378			328			—			—			169		75
Prior service (credit) cost amortization	(3		)	(3		)	—			—			2		2
Net periodic benefit cost (income)	$	(11	)	$	62		$	(32	)	$	(9	)	$	393	$	280

	Nine Months Ended September 30,
	Defined Benefit Pension Plan						Defined Benefit Pension Plan Acquired						Restoration Plan
	2018			2017			2018			2017			2018		2017
Service cost	$	1,161		$	1,048		$	—		$	—		$	220	$	185
Interest cost	2,544			2,701			123			133			447		425
Expected return on assets	(4,863		)	(4,538		)	(218		)	(160		)	—		—
Net loss amortization	1,134			984			—			—			508		226
Prior service (credit) cost amortization	(10		)	(10		)	—			—			5		5
Net periodic benefit cost (income)	$	(34	)	$	185		$	(95	)	$	(27	)	$	1,180	$	841

The service cost component is recorded on our consolidated income statement as salaries and employee benefits in noninterest expense while all other components other than service cost are recorded in other noninterest expense.

In the third quarter of 2018, we made contributions of $2.0 million and $500,000 to the defined benefit pension plan and the defined benefit pension plan acquired, respectively.

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9.    Share-based Incentive Plans

2017 Incentive Plan

On May 10, 2017, our shareholders approved the Southside Bancshares, Inc. 2017 Incentive Plan (the “2017 Incentive Plan”), which is a stock-based incentive compensation plan.  A total of 2,460,000 shares of our common stock were reserved and available for issuance pursuant to awards granted under the 2017 Incentive Plan. This amount includes a number of additional shares (not to exceed 410,000) underlying awards outstanding as of May 10, 2017 under the Company’s 2009 Incentive Plan that thereafter terminate or expire unexercised, or are cancelled, forfeited or lapse for any reason.  Under the 2017 Incentive Plan, we are authorized to grant stock options, stock appreciation rights, restricted stock, restricted stock units, performance awards and qualified performance-based awards or any combination thereof to selected employees, officers, directors and consultants of the Company and its affiliates. As of September 30, 2018, there were 1,687,830 shares remaining available for grant for future awards. 

All share data for all periods presented has been adjusted to give retroactive recognition to stock dividends unless otherwise indicated. Reference to incentive plans refers to the 2017 Incentive Plan and predecessor incentive plans.

There have been 356,849 nonqualified stock options (“NQSOs”) granted during the nine months ended September 30, 2018 with an exercise price equal to the fair value of the shares at the date of grant with a weighted average exercise price of $34.52.  During the nine months ended September 30, 2017, there were no stock option awards granted. The NQSOs have contractual terms of 10 years from the date of grant and vest in equal annual installments over either a three- or four-year period. During the nine months ended September 30, 2018, we granted 52,148 restricted stock units (“RSUs”) with a total value of $1.8 million. During the nine months ended September 30, 2017, there were 3,707 RSUs granted with a total value of $125,000. The RSUs vest in equal annual installments over either a one-, three- or four-year period.

Historically, shares issued in connection with stock compensation awards have been issued from available authorized shares. Beginning in the second quarter of 2017, shares were issued from available treasury shares. Shares issued in connection with stock compensation awards along with other related information are presented in the following table without the retroactive recognition of stock dividends (in thousands, except share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
New shares issued from available authorized shares	—		—		—		48,311
New shares issued from available treasury shares	65,918		77,957		128,969		89,724
Total	65,918		77,957		128,969		138,035
Proceeds from stock option exercises	$	1,571	$	1,505	$	2,655	$	2,527

For the three and nine months ended September 30, 2018, we had share-based compensation expense of $661,000 and $1.6 million, respectively. Share-based compensation expense for the three and nine months ended September 30, 2017 was $480,000 and $1.4 million, respectively.

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10.    Derivative Financial Instruments and Hedging Activities

Our hedging policy allows the use of interest rate derivative instruments to manage our exposure to interest rate risk or hedge specified assets and liabilities. These instruments may include interest rate swaps and interest rate caps and floors. All derivative instruments are carried on the balance sheet at their estimated fair value and are recorded in other assets or other liabilities, as appropriate.

Derivative instruments may be designated as cash flow hedges of variable rate assets or liabilities, cash flow hedges of forecasted transactions or fair value hedges of a recognized asset or liability. Gains and losses on derivative instruments designated as cash flow hedges are recorded in AOCI to the extent that they are effective. The amount recorded in other comprehensive income is reclassified to earnings in the same periods that the hedged cash flows impact earnings. The ineffective portion of changes in fair value is reported in current earnings. Gains and losses on derivative instruments designated as fair value hedges, as well as the change in fair value on the hedged item, are recorded in interest income in the consolidated statements of income. Gains and losses due to changes in fair value of the interest rate swap agreements completely offset changes in the fair value of the hedged portion of the hedged item. Therefore, no gain or loss has been recognized due to hedge ineffectiveness.

From time to time, we have entered into certain interest rate swap contracts on specific variable rate advance agreements with the FHLB. These interest rate swap contracts were designated as hedging instruments in cash flow hedges under ASC Topic 815. The objective of the interest rate swap contracts is to manage the expected future cash flows on $270.0 million of variable rate advance agreements with the FHLB. The cash flows from the swap are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the underlying LIBOR interest rate.

During the three months ended June 30, 2018, we entered into partial term fair value hedges, as allowed under the recently adopted ASU 2017-12, for certain of our fixed rate callable available for sale municipal securities. These partial term hedges of selected cash flows covering the time periods to the call dates of the hedged securities are expected to be effective in offsetting changes in the fair value of the hedged securities. As of September 30, 2018, hedged securities with a carrying amount of $23.3 million are included in our AFS securities portfolio in our consolidated balance sheets. Interest rate swaps designated as partial-term fair value hedges are utilized to mitigate the effect of changing interest rates on the hedged securities. The hedging strategy converts a portion of the fixed interest rates on the securities to LIBOR-based variable interest rates.

In accordance with ASC Topic 815, if a hedging item is terminated prior to maturity for a cash settlement, the existing gain or loss within AOCI will continue to be reclassified into earnings during the period or periods in which the hedged forecasted transaction affects earnings unless it is probable that the forecasted transaction will not occur by the end of the originally specified time period. If the forecasted transaction is deemed probable to not occur, the derivative gain or loss reported in AOCI shall be reclassified into earnings immediately. During the first quarter of 2017, we terminated two interest rate swap contracts designated as cash flow hedges. At the time of termination, we determined that the underlying hedged forecasted transactions were still probable of occurring. The existing gain in AOCI will be reclassified into earnings in the same periods the hedged forecasted transaction affects earnings.

From time to time, we may enter into certain interest rate swaps, cap and floor contracts that are not designated as hedging instruments. These interest rate derivative contracts relate to transactions in which we enter into an interest rate swap, cap, or floor with a customer while concurrently entering into an offsetting interest rate swap, cap, or floor with a third-party financial institution. We agree to pay interest to the customer on a notional amount at a variable rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, we agree to pay a third-party financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. These interest rate derivative contracts allow our customers to effectively convert a variable rate loan to a fixed rate loan. The changes in the fair value of the underlying derivative contracts primarily offset each other and do not significantly impact our results of operations. For derivative instruments not designated as hedging instruments, the gain or loss is recognized in current earnings during the period of change. We recognized swap fee income associated with these derivative contracts immediately based upon the difference in the bid/ask spread of the underlying transactions with the customer and the third-party financial institution. The swap fee income is included in other noninterest income in our consolidated statements of income.

At September 30, 2018, net derivative assets included $18.0 million of cash collateral received from counterparties under master netting agreements.

The notional amounts of the derivative instruments represent the contractual cash flows pertaining to the underlying agreements. These amounts are not exchanged and are not reflected in the consolidated balance sheets. The fair value of the interest rate swaps are presented at net in other assets and other liabilities when a right of offset exists, based on transactions with a single counterparty that are subject to a legally enforceable master netting agreement.

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The following tables present the notional and estimated fair value amount of derivative positions outstanding (in thousands):

	September 30, 2018								December 31, 2017
	Estimated Fair Value								Estimated Fair Value
	Notional Amount (1)		Asset Derivative			Liability Derivative			Notional Amount (1)		Asset Derivative			Liability Derivative
Derivatives designated as hedging instruments
Interest rate contracts:
Swaps-Cash Flow Hedge-Financial institution counterparties	$	270,000	$	14,965		$	—		$	240,000	$	7,922		$	22
Swaps-Fair Value Hedge-Financial institution counterparties	21,100		102			—			—		—			—
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	94,679		3,257			307			67,220		92			612
Swaps-Customer counterparties	94,679		307			3,257			67,220		612			92
Gross derivatives			18,631			3,564					8,626			726
Offsetting derivative assets/liabilities			(307		)	(307		)			(114		)	(114		)
Cash collateral received/posted			(18,017		)	—					(7,900		)	(520		)
Net derivatives included in the consolidated balance sheets (2)			$	307		$	3,257				$	612		$	92

(1) Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

(2) Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and $307,000 related to interest rate swaps with customers at September 30, 2018. We had net credit exposure of $30,000 related to interest rate swaps with financial institutions and $612,000 related to interest rate swaps with customers at December 31, 2017. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.

The summarized expected weighted average remaining maturity of the notional amount of interest rate swaps and the weighted average interest rates associated with the amounts expected to be received or paid on interest rate swap agreements are presented below (dollars in thousands). Variable rates received on pay fixed swaps are based on one-month or three-month LIBOR rates in effect at September 30, 2018 and December 31, 2017:

	September 30, 2018							December 31, 2017
			Weighted Average							Weighted Average
	Notional Amount		Remaining Maturity  (in years)	Receive Rate		Pay Rate		Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate
Swaps-Cash Flow Hedge
Financial institution counterparties	$	270,000	5.1	2.18	%	1.58	%	$	240,000	5.3	1.44	%	1.43	%
Swaps-Fair Value Hedge
Financial institution counterparties	21,100		7.8	2.34		3.00		—		—	—		—
Swaps-Non-Hedging
Financial institution counterparties	94,679		12.1	2.12		2.58		67,220		12.7	1.39		2.37
Customer counterparties	94,679		12.1	2.58		2.12		67,220		12.7	2.37		1.39

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11.  Fair Value Measurement

Fair value is the price that would be received upon the sale of an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants.  A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability.  The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability is not adjusted for transaction costs.  An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction.  Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.

Valuation techniques including the market approach, the income approach and/or the cost approach are utilized to determine fair value.  Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability.  Valuation policies and procedures are determined by our investment department and reported to our Asset/Liability Committee (“ALCO”) for review.  An entity must consider all aspects of nonperforming risk, including the entity’s own credit standing, when measuring fair value of a liability.  Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances.  A fair value hierarchy for valuation inputs 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.

Level 3 assets recorded at fair value on a nonrecurring basis at September 30, 2018 and December 31, 2017 included loans for which a specific allowance was established based on the fair value of collateral and commercial real estate for which fair value of the properties was less than the cost basis.  For both asset classes, the unobservable inputs were the additional adjustments applied by management to the appraised values to reflect such factors as non-current appraisals and revisions to estimated time to sell.  These adjustments are determined based on qualitative judgments made by management on a case-by-case basis and are not quantifiable inputs, although they are used in the determination of fair value.

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

Certain financial assets are measured at fair value in accordance with GAAP.  Adjustments to the fair value of these assets usually result from the application of fair value accounting or write-downs of individual assets.  Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with our monthly and/or quarterly valuation process.  There were no transfers between Level 1 and Level 2 during the nine months ended September 30, 2018 or the year ended December 31, 2017.

Securities Available for Sale and Equity Investments with readily determinable fair values – U.S. Treasury securities and equity investments are reported at fair value utilizing Level 1 inputs.  Other securities classified as available for sale are reported at fair value utilizing Level 2 inputs.  For these securities, we obtain fair value measurements from independent pricing services and obtain an understanding of the pricing methodologies used by these independent pricing services. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things, as stated in the pricing methodologies of the independent pricing services.

We review and validate the prices supplied by the independent pricing services for reasonableness by comparison to prices obtained from, in most cases, two additional third party sources. For securities where prices are outside a reasonable range, we

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further review those securities, based on internal ALCO approved procedures, to determine what a reasonable fair value measurement is for those securities, given available data.

Derivatives – Derivatives are reported at fair value utilizing Level 2 inputs. We obtain fair value measurements from three sources including an independent pricing service and the counterparty to the derivatives designated as hedges.  The fair value measurements consider observable data that may include dealer quotes, market spreads, the U.S. Treasury yield curve, live trading levels, trade execution data, credit information and the derivatives’ terms and conditions, among other things. We review the prices supplied by the sources for reasonableness.  In addition, we obtain a basic understanding of their underlying pricing methodology.  We validate prices supplied by the sources by comparison to one another.

Certain nonfinancial assets and nonfinancial liabilities measured at fair value on a recurring basis include reporting units measured at fair value and tested for goodwill impairment. 

Certain financial assets and financial liabilities are measured at fair value on a nonrecurring basis, which means that the instruments 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). Financial assets and financial liabilities measured at fair value on a nonrecurring basis included foreclosed assets and impaired loans at September 30, 2018 and December 31, 2017.

Foreclosed Assets – Foreclosed assets are initially recorded at fair value less costs to sell.  The fair value measurements of foreclosed assets can include Level 2 measurement inputs such as real estate appraisals and comparable real estate sales information, in conjunction with Level 3 measurement inputs such as cash flow projections, qualitative adjustments and sales cost estimates.  As a result, the categorization of foreclosed assets is Level 3 of the fair value hierarchy.  In connection with the measurement and initial recognition of certain foreclosed assets, we may recognize charge-offs through the allowance for loan losses.

Impaired Loans – Certain impaired loans may be reported at the fair value of the underlying collateral if repayment is expected solely from the collateral.  Collateral values are estimated using Level 3 inputs based on customized discounting criteria or appraisals.  At September 30, 2018 and December 31, 2017, the impact of loans with specific reserves based on the fair value of the collateral was reflected in our allowance for loan losses.

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The following tables summarize assets measured at fair value on a recurring and nonrecurring basis segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):

	As of September 30, 2018
			Fair Value Measurements at the End of the Reporting Period Using
	Carrying Amount		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring fair value measurements
Investment Securities:
U.S. Treasury	$	19,748	$	19,748	$	—	$	—
State and Political Subdivisions	699,069		—		699,069		—
Other Stocks and Bonds	3,027		—		3,027		—
Mortgage-backed Securities: (1)
Residential	687,598		—		687,598		—
Commercial	529,835		—		529,835		—
Equity Investments:
Equity Investments (2)	5,735		5,735		—		—
Derivative assets:
Interest rate swaps	18,631		—		18,631		—
Total asset recurring fair value measurements	$	1,963,643	$	25,483	$	1,938,160	$	—
Derivative liabilities:
Interest rate swaps	$	3,564	$	—	$	3,564	$	—
Total liability recurring fair value measurements	$	3,564	$	—	$	3,564	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	1,413	$	—	$	—	$	1,413
Impaired loans (3)	33,280		—		—		33,280
Total asset nonrecurring fair value measurements	$	34,693	$	—	$	—	$	34,693

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	As of December 31, 2017
			Fair Value Measurements at the End of the Reporting Period Using
	Carrying Amount		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring fair value measurements
Investment Securities:
U.S. Government Agency Debentures	$	108,869	$	—	$	108,869	$	—
State and Political Subdivisions	392,664		—		392,664		—
Other Stocks and Bonds	5,055		—		5,055		—
Equity Investments (2)	5,920		5,920		—		—
Mortgage-backed Securities: (1)
Residential	718,029		—		718,029		—
Commercial	308,218		—		308,218		—
Derivative assets:
Interest rate swaps	8,626		—		8,626		—
Total asset recurring fair value measurements	$	1,547,381	$	5,920	$	1,541,461	$	—
Derivative liabilities:
Interest rate swaps	$	726	$	—	$	726	$	—
Total liability recurring fair value measurements	$	726	$	—	$	726	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	1,767	$	—	$	—	$	1,767
Impaired loans (3)	6,536		—		—		6,536
Total asset nonrecurring fair value measurements	$	8,303	$	—	$	—	$	8,303

(1) All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(2) With the adoption of ASU 2016-01 on January 1, 2018, these investments are included in equity investments on our consolidated balance sheets. The guidance was applied on a prospective approach resulting in prior-periods no longer being comparable. See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

(3) Impaired loans represent collateral-dependent loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.

Disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, is required when it is practicable to estimate that value.  In cases where quoted market prices are not available, fair values are based on estimates using present value or other estimation techniques.  Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows.  Such techniques and assumptions, as they apply to individual categories of our financial instruments, are as follows:

Cash and cash equivalents - The carrying amount for cash and cash equivalents is a reasonable estimate of those assets’ fair value.

Investment and mortgage-backed securities held to maturity - Fair values for these securities are based on quoted market prices, where available.  If quoted market prices are not available, fair values are based on quoted market prices for similar securities or estimates from independent pricing services.

FHLB stock - The carrying amount of FHLB stock is a reasonable estimate of the fair value of those assets.

Equity investments - Equity investments with readily determinable fair values are presented at fair value based upon the currently available bid-and-ask quotations publicly available on a market or exchange. The carrying value of other equity investments without readily determinable fair values are measured at cost less impairment, if any, adjusted for observable price changes for an identical or similar investment of the same issuer. This carrying value is a reasonable estimate of the fair value of those assets.

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Loans receivable - With the adoption of ASU 2016-01 on January 1, 2018,we refined our methodology to estimate the fair value of our loan portfolio to an exit price notion with adjustments for liquidity, credit and prepayment factors. The guidance was applied on a prospective approach resulting in prior-periods no longer being comparable. See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information. For December 31, 2017, adjustable rate loans that repriced frequently and with no significant change in credit risk, the carrying amounts were a reasonable estimate of those assets’ fair value and the fair value of fixed rate loans were estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities.  Nonperforming loans continue to be estimated using discounted cash flow analyses or the underlying value of the collateral where applicable.

Loans held for sale – The fair value of loans held for sale is determined based on expected proceeds, which are based on sales contracts and commitments.

Deposit liabilities - The fair value of demand deposits, savings accounts and certain money market deposits is the amount on demand at the reporting date, which is the carrying value.  Fair values for fixed rate CDs are estimated using a discounted cash flow calculation that applies interest rates currently being offered for deposits of similar remaining maturities.

Federal funds purchased and repurchase agreements - Federal funds purchased generally have original terms to maturity of one day and repurchase agreements generally have terms of less than one year, and therefore both are considered short-term borrowings. Consequently, their carrying value is a reasonable estimate of fair value.

FHLB borrowings - The fair value of these borrowings is estimated by discounting the future cash flows using rates at which borrowings would be made to borrowers with similar credit ratings and for the same remaining maturities.

Subordinated notes - The fair value of the subordinated notes is estimated by discounting future cash flows using estimated rates at which long-term debt would be made to borrowers with similar credit ratings and for the remaining maturities.

Long-term debt - The fair value of the long-term debt is estimated by discounting future cash flows using estimated rates at which long-term debt would be made to borrowers with similar credit ratings and for the remaining maturities.

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The following tables present our financial assets and financial liabilities measured on a nonrecurring basis at both their respective carrying amounts and estimated fair value (in thousands):

			Estimated Fair Value
September 30, 2018	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial Assets:
Cash and cash equivalents	$	174,072	$	174,072	$	174,072	$	—	$	—
Investment Securities:
Held to maturity, at carrying value	3,087		3,030		—		3,030		—
Mortgage-backed Securities:
Held to maturity, at carrying value	160,278		153,442		—		153,442		—
FHLB stock, at cost	32,291		32,291		—		32,291		—
Equity investments	6,294		6,294		—		6,294		—
Loans, net of allowance for loan losses	3,248,432		3,179,049		—		—		3,179,049
Loans held for sale	954		954		—		954		—
Financial Liabilities:
Deposits	$	4,553,512	$	4,543,794	$	—	$	4,543,794	$	—
Federal funds purchased and repurchase agreements	8,975		8,975		—		8,975		—
FHLB borrowings	561,267		542,846		—		542,846		—
Subordinated notes, net of unamortized debt issuance costs	98,366		97,979		—		97,979		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,244		51,014		—		51,014		—

			Estimated Fair Value
December 31, 2017	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial Assets:
Cash and cash equivalents	$	198,692	$	198,692	$	198,692	$	—	$	—
Investment Securities:
Held to maturity, at carrying value	413,632		421,928		—		421,928		—
Mortgage-backed Securities:
Held to maturity, at carrying value	495,874		499,872		—		499,872		—
FHLB stock, at cost	55,729		55,729		—		55,729		—
Equity investments	5,821		5,821		—		5,821		—
Loans, net of allowance for loan losses	3,273,575		3,269,316		—		—		3,269,316
Loans held for sale	2,001		2,001		—		2,001		—
Financial Liabilities:
Deposits	$	4,515,447	$	4,506,133	$	—	$	4,506,133	$	—
Federal funds purchased and repurchase agreements	9,498		9,498		—		9,498		—
FHLB borrowings	1,017,361		1,008,292		—		1,008,292		—
Subordinated notes, net of unamortized debt issuance costs	98,248		99,665		—		99,665		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,241		47,622		—		47,622		—

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The fair value estimate of financial instruments for which quoted market prices are unavailable is dependent upon the assumptions used.  Consequently, those estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instruments.  Accordingly, the aggregate fair value amounts presented in the above fair value tables do not necessarily represent their underlying value.

12.     Income Taxes

The income tax expense included in the accompanying statements of income consists of the following (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Current income tax expense	$	95	$	3,454	$	3,107	$	9,798
Deferred income tax expense	2,097		436		4,535		453
Income tax expense	$	2,192	$	3,890	$	7,642	$	10,251

The Tax Cuts and Jobs Act (“Tax Act”) was enacted on December 22, 2017. The Tax Act reduces the U.S. federal corporate tax rate from 35% to 21%. We remeasured certain deferred tax assets and liabilities as of December 22, 2017 based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing certain aspects of the Tax Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. During the three and nine months ended September 30, 2018, we recognized a benefit of approximately $800,000 made to the provisional amounts recorded with the remeasurement of the net deferred tax asset.

The Tax Act repealed the existing Alternative Minimum Tax (“AMT”). As of September 30, 2018, we have a remaining AMT tax credit of $2.2 million. This remaining tax credit carryforward can be used to offset regular future tax liability. Additionally, this AMT credit is refundable in any taxable year after 2017 and before 2022 in an amount equal to 50% of the excess of the minimum tax credit for the taxable year over the amount of the credit allowable for the year against regular tax liability. We expect to realize the remaining AMT tax credit in 2018 to offset tax liability.

Net deferred tax assets totaled $16.4 million at September 30, 2018 and $12.2 million at December 31, 2017.  No valuation allowance for the net deferred tax asset was recorded at September 30, 2018 or December 31, 2017, as management believes it is more likely than not that all of the net deferred tax asset will be realized in future years. Unrecognized tax benefits were not material at September 30, 2018 or December 31, 2017.

We recognized income tax expense of $2.2 million and $7.6 million, for an effective tax rate (“ETR”) of 9.7% and 11.9% for the three and nine months ended September 30, 2018, respectively, compared to income tax expense of $3.9 million and $10.3 million, for an ETR of 21.1% and 18.9%, for the three and nine months ended September 30, 2017, respectively. The lower ETR for the three and nine months ended September 30, 2018 was mainly due to the reduced corporate tax rate under the Tax Act from 35% to 21%. Additionally, the benefit recorded with the remeasurement lowered the ETR by 3.6% and 1.2% for the three and nine months ended September 30, 2018, respectively. The ETR differs from the stated rate of 21% and 35% for the three and nine months ended September 30, 2018 and 2017, respectively, primarily due to the effect of tax-exempt income from municipal loans and securities, as well as bank owned life insurance. We file federal income tax returns in the U.S. federal jurisdictions and in certain states. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2015 or Texas state tax examinations by tax authorities for years before 2014.

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13.     Off-Balance-Sheet Arrangements, Commitments and Contingencies

Financial Instruments with Off-Balance-Sheet Risk. In the normal course of business, we are a party to certain financial instruments with off-balance-sheet risk to meet the financing needs of our customers.  These off-balance-sheet instruments include commitments to extend credit and standby letters of credit.  These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount reflected in the financial statements.  The contract or notional amounts of these instruments reflect the extent of involvement and exposure to credit loss that we have in these particular classes of financial instruments.

Commitments to extend credit are agreements to lend to a customer provided that the terms established in the contract are met.  Commitments generally have fixed expiration dates and may require the payment of fees.  Since some commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan commitments to customers and similarly do not necessarily represent future cash obligations.

Financial instruments with off-balance-sheet risk were as follows (in thousands):

	At September 30, 2018		At December 31, 2017
Unused commitments:
Commitments to extend credit	$	819,256	$	804,715
Standby letters of credit	28,197		14,890
Total	$	847,453	$	819,605

We apply the same credit policies in making commitments and standby letters of credit as we do for on-balance-sheet instruments.  We evaluate each customer’s creditworthiness on a case-by-case basis.  The amount of collateral obtained, if deemed necessary, upon extension of credit is based on management’s credit evaluation of the borrower.  Collateral held varies but may include cash or cash equivalents, negotiable instruments, real estate, accounts receivable, inventory, oil, gas and mineral interests, property, plant and equipment.

Lease Commitments. We lease certain branch facilities and office equipment under operating leases.  It is expected that certain leases will be renewed, or equipment replaced with new leased equipment, as these leases expire.

Securities. In the normal course of business we buy and sell securities. At September 30, 2018, there were $28.7 million of unsettled trades to purchase securities and $14.6 million unsettled trades to sell securities. There were no unsettled trades to purchase securities and no unsettled trades to sell securities at December 31, 2017.

Deposits. At September 30, 2018, there were $10.0 million of unsettled issuances of brokered certificates of deposit (“CDs”). There were no unsettled issuances of brokered CDs at December 31, 2017.

Litigation. We are involved with various litigation in the normal course of business.  Management, after consulting with our legal counsel, believes that any liability resulting from litigation will not have a material effect on our financial position, results of operations or liquidity.

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

The following is a discussion of our consolidated financial condition, changes in our financial condition, and results of our operations, and should be read and reviewed in conjunction with the financial statements, and the notes thereto, in this Quarterly Report on Form 10-Q and in our Annual Report on Form 10-K for the year ended December 31, 2017.

Forward-Looking Statements

Certain statements of other than historical fact that are contained in this report may be considered to be “forward-looking statements” within the meaning of and subject to the safe harbor protections of the Private Securities Litigation Reform Act of 1995.  These forward-looking statements are not guarantees of future performance, nor should they be relied upon as representing management’s views as of any subsequent date.  These statements may include words such as “expect,” “estimate,” “project,” “anticipate,” “appear,” “believe,” “could,” “should,” “may,” “will,” “would,” “seek,” “intend,” “probability,” “risk,” “goal,” “objective,” “plans,” “potential,” and similar expressions. Forward-looking statements are statements with respect to our beliefs, plans, expectations, objectives, goals, anticipations, assumptions and estimates about our future performance and are subject to significant known and unknown risks and uncertainties, which could cause our actual results to differ materially from the results discussed in the forward-looking statements.  For example, discussions about trends in asset quality, capital, liquidity, the pace of loan and revenue growth, the Company’s ability to sell nonperforming assets, expense reductions, planned operational efficiencies, earnings and certain market risk disclosures, including the impact of interest rates and other economic factors, are based upon information presently available to management and are dependent on choices about key model characteristics and assumptions and are subject to various limitations.  By their nature, certain of the market risk disclosures are only estimates and could be materially different from what actually occurs in the future.  Accordingly, our results could materially differ from those that have been estimated.  Other factors that could cause actual results to differ materially from those indicated by forward-looking statements include, but are not limited to, the following:

• general economic conditions, either globally, nationally, in the State of Texas, or in the specific markets in which we operate, including, without limitation, the deterioration of the commercial real estate, residential real estate, construction and development, energy, oil, and gas credit and liquidity markets, which could cause an adverse change in our net interest margin, or a decline in the value of our assets, which could result in realized losses;

• current or future legislation, regulatory changes or changes in monetary or fiscal policy that adversely affect the businesses in which we are engaged, including the impact of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (“Dodd-Frank Act”), the Federal Reserve’s actions with respect to interest rates, the capital requirements promulgated by the Basel Committee on Banking Supervision (“Basel Committee”) and other regulatory responses to economic conditions;

• adverse changes in the status or financial condition of the Government-Sponsored Enterprises (the “GSEs”) which impact the GSEs’ guarantees or ability to pay or issue debt;

• adverse changes in the credit portfolio of other U.S. financial institutions relative to the performance of certain of our investment securities;

• economic or other disruptions caused by acts of terrorism in the United States, Europe or other areas;

• technological changes, including potential cyber-security incidents;

• our ability to identify and address cyber-security risks such as data security breaches, malware, "denial of service" attacks, "hacking" and identity theft, a failure of which could disrupt our business and result in the disclosure of and/or misuse or misappropriation of confidential or proprietary information, disruption or damage of our systems, increased costs, significant losses, or adverse effects to our reputation;

• the risk that our enterprise risk management framework may not identify or address risks adequately, which may result in unexpected losses;

• changes in the interest rate yield curve such as flat, inverted or steep yield curves, or changes in the interest rate environment that impact interest margins and may impact prepayments on our mortgage-backed securities (“MBS”) portfolio;

• increases in our nonperforming assets;

• our ability to maintain adequate liquidity to fund operations and growth;

• any applicable regulatory limits or other restrictions on Southside Bank’s ability to pay dividends to us;

• the failure of our assumptions underlying allowance for loan losses and other estimates;

• the effectiveness of our derivative financial instruments and hedging activities to manage risk;

• unexpected outcomes of, and the costs associated with, existing or new litigation involving us;

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• changes impacting our balance sheet and leverage strategy;

• risks related to actual mortgage prepayments diverging from projections;

• risks related to actual U.S. Agency MBS prepayments exceeding projected prepayment levels;

• risks related to U.S. Agency MBS prepayments increasing due to U.S. Government programs designed to assist homeowners to refinance their mortgage that might not otherwise have qualified;

• our ability to monitor interest rate risk;

• risks related to the price per barrel of crude oil;

• significant increases in competition in the banking and financial services industry;

• changes in consumer spending, borrowing and saving habits;

• the risk that we may be required to take additional charges with respect to our deferred tax assets as a result of Tax Cuts and Jobs Act (“Tax Act”) in the event our estimates prove false;

• execution of future acquisitions, reorganization or disposition transactions, including the risk that the anticipated benefits of such transactions are not realized;

• our ability to increase market share and control expenses;

• our ability to develop competitive new products and services in a timely manner and the acceptance of such products and services by our customers;

• the effect of changes in federal or state tax laws;

• the effect of compliance with legislation or regulatory changes;

• the effect of changes in accounting policies and practices;

• credit risks of borrowers, including any increase in those risks due to changing economic conditions;

• risks related to loans secured by real estate, including the risk that the value and marketability of collateral could decline; and

• other risks and uncertainties discussed in “Part I - Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2017.

All written or oral forward-looking statements made by us or attributable to us are expressly qualified by this cautionary notice.  We disclaim any obligation to update any factors or to announce publicly the result of revisions to any of the forward-looking statements included herein to reflect future events or developments, unless otherwise required by law.

Critical Accounting Estimates

Our accounting and reporting estimates conform with U.S. generally accepted accounting principles (“GAAP”) and general practices within the financial services industry.  The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes.  Actual results could differ from those estimates.  We consider our critical accounting policies to include the following:

Allowance for Losses on Loans.  The allowance for losses on loans represents our best estimate of probable losses inherent in the existing loan portfolio.  The allowance for losses on loans is increased by the provision for losses on loans charged to expense and reduced by loans charged-off, net of recoveries.  The provision for losses on loans is determined based on our assessment of several factors:  reviews and evaluations of specific loans, changes in the nature and volume of the loan portfolio, current economic conditions and the related impact on specific borrowers and industry groups, historical loan loss experience, the level of classified and nonperforming loans and the results of regulatory examinations.

The allowance for loan loss is based on the most current review of the loan portfolio and is a result of multiple processes.  The servicing officer has the primary responsibility for updating significant changes in a customer’s financial position.  Each officer prepares status updates on any credit deemed to be experiencing repayment difficulties which, in the officer’s opinion, would place the collection of principal or interest in doubt.  Our internal loan review department is responsible for an ongoing review of our loan portfolio with specific goals set for the loans to be reviewed on an annual basis.

At each review, a subjective analysis methodology is used to grade the respective loan.  Categories of grading vary in severity from loans that do not appear to have a significant probability of loss at the time of review to loans that indicate a probability that the entire balance of the loan will be uncollectible.  If full collection of the loan balance appears unlikely at the time of review, estimates of future expected cash flows or appraisals of the collateral securing the debt are used to determine the necessary allowances.  The internal loan review department maintains a list of all loans or loan relationships that are graded as having more

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than the normal degree of risk associated with them.  In addition, a list of specifically reserved loans or loan relationships of $150,000 or more is updated on a quarterly basis in order to properly determine the necessary allowance and keep management informed on the status of attempts to correct the deficiencies noted with respect to the loan.

Loans are considered impaired if, based on current information and events, it is probable that we will be unable to collect the scheduled payments of principal and interest when due according to the contractual terms of the loan agreement.  The measurement of loss on impaired loans is generally based on the fair value of the collateral if repayment is expected solely from the collateral or the present value of the expected future cash flows discounted at the historical effective interest rate stipulated in the loan agreement. In measuring the fair value of the collateral, in addition to relying on third party appraisals, we use assumptions such as discount rates and methodologies, comparisons to recent sales prices of similar assets, and other assumptions consistent with those that would be utilized by unrelated third parties performing a valuation.

Changes in the financial condition of individual borrowers, economic conditions, historical loss experience and the conditions of the various markets in which collateral may be sold all may affect the required level of the allowance for losses on loans and the associated provision for loan losses.

The allowance for loan losses related to purchase credit impaired (“PCI”) loans is based on an analysis that is performed quarterly to estimate the expected cash flows for each loan deemed PCI. To the extent that the expected cash flows from a PCI loan have decreased since the acquisition date, we establish or increase the allowance for loan losses.

For acquired loans that are not deemed credit impaired at acquisition, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value. Subsequent to the purchase date, the methods utilized to estimate the required allowance for loan losses for these loans is similar to originated loans. The remaining differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the economic life of the loan.

As of September 30, 2018, our review of the loan portfolio indicated that a loan loss allowance of $26.1 million was appropriate to cover probable losses in the portfolio.

Refer to “Part II - Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations - Loan Loss Experience and Allowance for Loan Losses” and “Note 6 – Loans and Allowance for Probable Loan Losses” in our Annual Report on Form 10-K for the year ended December 31, 2017 for a detailed description of our estimation process and methodology related to the allowance for loan losses.

Estimation of Fair Value.  The estimation of fair value is significant to a number of our assets and liabilities.  In addition, GAAP requires disclosure of the fair value of financial instruments as a part of the notes to the consolidated financial statements.  Fair values for securities are volatile and may be influenced by a number of factors, including market interest rates, prepayment speeds, discount rates and the shape of yield curves.  Fair values for most investment and MBS are based on quoted market prices, where available.  If quoted market prices are not available, fair values are based on the quoted prices of similar instruments or estimates from independent pricing services.  Where there are price variances outside certain ranges from different pricing services for specific securities, those pricing variances are reviewed with other market data to determine which of the price estimates is appropriate for that period.  Fair values for our derivatives are based on measurements that consider observable data that may include dealer quotes, market spreads, the U.S. Treasury yield curve, live trading levels, trade execution data, credit information, and the derivatives’ terms and conditions, among other things. We validate prices supplied by such sources by comparison to one another.

Business Combination.During a business combination consideration is first assigned to identifiable assets and liabilities, based on estimated fair values, with any excess recorded as goodwill. Determining fair value requires significant estimates and assumptions based on an evaluation of a number of factors, such as market share, customer and employee loyalty, asset lives, and the amount and timing of prospective cash flows and the discount rate applied to the cash flows. Assets and liabilities, including deposits, core deposit intangibles, property and equipment and loans, among others, are evaluated based upon the nature of the asset or liability, the business in which it is utilized and the economic return it is generating or expected to generate.

Deposits, in a business combination, are evaluated based upon maturity and the weighted average rate to determine the present value or fair value.

Core Deposit Intangibles represent the cost savings derived from available core deposits relative to alternative financing. The cost of deposits on hand is evaluated against the Company’s primary source of funds, or FHLB advance agreements.

For loans acquired in a business combination, refer to “Allowance for Losses on Loans” in this section.

Other intangibles are evaluated based upon the nature of the underlying asset, life and the timing of prospective cash flows.

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Property and equipment obtained in a business combination is evaluated at the highest and best use of the asset. Functional and economic obsolescence is also evaluated.

Impairment of Investment Securities and Mortgage-backed Securities.  Investment securities and MBS classified as available for sale (“AFS”) are carried at fair value, and the impact of changes in fair value are recorded on our consolidated balance sheet as an unrealized gain or loss in “Accumulated other comprehensive (loss) income,” a separate component of shareholders’ equity.  Securities classified as AFS or held to maturity (“HTM”) are subject to our review to identify when a decline in value is other-than-temporary.  When it is determined that a decline in value is other-than-temporary, the carrying value of the security is reduced to its estimated fair value, with a corresponding charge to earnings for the credit portion and to other comprehensive income for the noncredit portion.  Factors considered in determining whether a decline in value is other-than-temporary include: (1) whether the decline is substantial, the duration of the decline and the reasons for the decline in value; (2) whether the decline is related to a credit event, a change in interest rate or a change in the market discount rate; (3) the financial condition and near-term prospects of the issuer; and (4) whether we have a current intent to sell the security and whether it is not more likely than not that we will be required to sell the security before the anticipated recovery of its amortized cost basis. For certain assets, we consider expected cash flows of the investment in determining if impairment exists.

Defined Benefit Pension Plan. The plan obligations and related assets of our defined benefit pension plan (the “Plan”) and the OmniAmerican Bank Defined Benefit Plan (the “Acquired Plan”) are presented in “Note 11 – Employee Benefits” in our Annual Report on Form 10-K for the year ended December 31, 2017.  Entry into the Plan by new employees was frozen effective December 31, 2005.  Effective December 31, 2006, employee benefits under the Acquired Plan were frozen by Omni. In addition, no new participants may be added to the Acquired Plan. Assets in both plans, which consist primarily of marketable equity and debt instruments, are valued using observable market quotations.  Obligations and the annual pension expense are determined by independent actuaries and through the use of a number of assumptions that are reviewed by management.  Key assumptions in measuring the obligations of both plans include the discount rate and the estimated future return on assets in both plans. The rate of salary increases is another key assumption used in measuring the Plan obligation. The rate of salary increases is not required to measure the obligations of the Acquired Plan since the benefits are frozen.  In determining the discount rate, we utilized a cash flow matching analysis to determine a range of appropriate discount rates for our defined benefit pension and restoration plans.  In developing the cash flow matching analysis, we constructed a portfolio of high quality noncallable bonds (rated AA- or better) to match as close as possible the timing of future benefit payments of the Plans at December 31, 2017.  Based on this cash flow matching analysis, we were able to determine an appropriate discount rate.

Salary increase assumptions for the Plan are based upon historical experience and our anticipated future actions. The expected long-term rate of return assumption reflects the average return expected based on the investment strategies and asset allocation on the assets invested to provide for the Plan’s liabilities. We consider broad equity and bond indices, long-term return projections, and actual long-term historical Plan performance when evaluating the expected long-term rate of return assumption. At September 30, 2018, the weighted-average actuarial assumptions of the Plan were: a discount rate of 3.71%; assumed salary increases of 3.50%; and a long-term rate of return on Plan assets of 7.25%. Material changes in pension benefit costs may occur in the future due to changes in these assumptions.  Future annual amounts could be impacted by changes in the number of participants in the plans, changes in the level of benefits provided, changes in the discount rates, changes in the expected long-term rate of return, changes in the level of contributions to the plans and other factors.

Non-GAAP Financial Measures

Certain non-GAAP measures are used by management to supplement the evaluation of our performance. These include the following fully taxable-equivalent measures (“FTE”): Net interest income (FTE), Net interest margin (FTE) and Net interest spread (FTE), which include the effects of taxable-equivalent adjustments using a federal income tax rate of 21% and 35% for the three and nine months ended September 30, 2018 and 2017, respectively, to increase tax-exempt interest income to a tax-equivalent basis. Interest income earned on certain assets is completely or partially exempt from federal income tax. As such, these tax-exempt instruments typically yield lower returns than taxable investments.

Net interest income (FTE), Net interest margin (FTE) and Net interest spread (FTE).  Net interest income (FTE) is a non-GAAP measure that adjusts for the tax-favored status of net interest income from certain loans and investments and is not permitted under GAAP in the Consolidated Statements of Income. We believe this measure to be the preferred industry measurement of net interest income and it enhances comparability of net interest income arising from taxable and tax-exempt sources. The most directly comparable financial measure calculated in accordance with GAAP is our net interest income. Net interest margin (FTE) is the ratio of net interest income (FTE) to average earning assets. The most directly comparable financial measure calculated in accordance with GAAP is our net interest margin. Net interest spread (FTE) is the difference in the average yield on average earning assets on a tax-equivalent basis and the average rate paid on average interest bearing liabilities. The most directly comparable financial measure calculated in accordance with GAAP is our net interest spread.

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These non-GAAP financial measures should not be considered alternatives to GAAP-basis financial statements, and other bank holding companies may define or calculate these non-GAAP measures or similar measures differently. Whenever we present a non-GAAP financial measure in an SEC filing, we are also required to present the most directly comparable financial measure calculated and presented in accordance with GAAP and reconcile the differences between the non-GAAP financial measure and such comparable GAAP measure.

In the following table we present the reconciliation of net interest income to net interest income adjusted to a fully taxable-equivalent basis assuming a 21% and 35% marginal tax rate for the three and nine months ended September 30, 2018 and 2017, respectively, for interest earned on tax-exempt assets such as municipal loans and investment securities (dollars in thousands), along with the calculation of net interest margin (FTE) and net interest spread (FTE).

Non-GAAP Reconciliations
	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Net interest income (GAAP)	$	42,410		$	34,960		$	129,654		$	105,664
Tax equivalent adjustments:
Loans	590			1,103			1,755			3,188
Investment securities (tax-exempt)	1,801			3,544			5,071			10,148
Net interest income (FTE) (1)	$	44,801		$	39,607		$	136,480		$	119,000
Average earning assets	$	5,654,566		$	5,199,349		$	5,747,816		$	5,206,988
Net interest margin	2.98		%	2.67		%	3.02		%	2.71		%
Net interest margin (FTE) (1)	3.14		%	3.02		%	3.17		%	3.06		%
Net interest spread	2.65		%	2.47		%	2.73		%	2.54		%
Net interest spread (FTE) (1)	2.82		%	2.82		%	2.89		%	2.88		%

(1) These amounts are presented on a fully taxable-equivalent basis and are non-GAAP measures.

Management believes adjusting net interest income, net interest margin and net interest spread to a fully taxable-equivalent basis is a standard practice in the banking industry as these measures provide useful information to make peer comparisons. Tax-equivalent adjustments are reported in the respective earning asset categories as listed in the “Average Balances with Average Yields and Rates” tables under Results of Operations.

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Off-Balance-Sheet Arrangements, Commitments and Contingencies

Financial Instruments with Off-Balance-Sheet Risk. In the normal course of business, we are a party to certain financial instruments with off-balance-sheet risk to meet the financing needs of our customers. These off-balance-sheet instruments include commitments to extend credit and standby letters of credit. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount reflected in the financial statements. The contract or notional amounts of these instruments reflect the extent of involvement and exposure to credit loss that we have in these particular classes of financial instruments.

Commitments to extend credit are agreements to lend to a customer provided that the terms established in the contract are met. Commitments generally have fixed expiration dates and may require the payment of fees. Since some commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan commitments to customers and similarly do not necessarily represent future cash obligations.

Financial instruments with off-balance-sheet risk were as follows (in thousands):

	At September 30, 2018		At December 31, 2017
Unused commitments:
Commitments to extend credit	$	819,256	$	804,715
Standby letters of credit	28,197		14,890
Total	$	847,453	$	819,605

We apply the same credit policies in making commitments and standby letters of credit as we do for on-balance-sheet instruments.  We evaluate each customer’s creditworthiness on a case-by-case basis.  The amount of collateral obtained, if deemed necessary, upon extension of credit is based on management’s credit evaluation of the borrower.  Collateral held varies but may include cash or cash equivalents, negotiable instruments, real estate, accounts receivable, inventory, oil, gas and mineral interests, property, plant and equipment.

Lease Commitments. We lease certain branch facilities and office equipment under operating leases.  It is expected that certain leases will be renewed, or equipment replaced with new leased equipment, as these leases expire.

Securities. In the normal course of business we buy and sell securities. At September 30, 2018, there were $28.7 million of unsettled trades to purchase securities and $14.6 million unsettled trades to sell securities. There were no unsettled trades to purchase securities and no unsettled trades to sell securities at December 31, 2017.

Deposits. At September 30, 2018, there were $10.0 million of unsettled issuances of brokered certificates of deposit (“CDs”). There were no unsettled issuances of brokered CDs at December 31, 2017.

Litigation. We are a party to various litigation in the normal course of business.  Management, after consulting with our legal counsel, believes that any liability resulting from litigation will not have a material effect on our financial position, results of operations or liquidity.

OVERVIEW

Operating Results

Net income increased $5.8 million, or 39.9%, for the three months ended September 30, 2018, to $20.3 million compared to the same period in 2017. The increase was the result of a $10.7 millionincrease in interest income, a $1.7 milliondecrease in income tax expense and a $0.6 million increase in noninterest income, partially offset by a $4.0 millionincrease in noninterest expense and a $3.2 millionincrease in interest expense. Earnings per diluted common share increased $0.09, or 18.4%, to $0.58 for the three months ended September 30, 2018, from $0.49 for the same period in 2017.

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During the nine months ended September 30, 2018, our net income increased $12.8 million, or 29.0%, to $56.8 million from $44.0 million for the same period in 2017. The increase was the result of a $33.8 millionincrease in interest income, a $2.6 milliondecrease in income tax expense and a $2.3 millionincrease in noninterest income, partially offset by a $13.5 millionincrease in noninterest expense, a $9.8 millionincrease in interest expense and a $2.6 millionincrease in provision for loan losses. Earnings per diluted common share increased $0.12, or 8.1% to $1.61 for the nine months ended September 30, 2018, from $1.49 for the same period in 2017.

Financial Condition

Our total assets decreased $392.7 million, or 6.0%, to $6.11 billion at September 30, 2018 from $6.50 billion at December 31, 2017. Our securities portfolio decreased by $345.6 million, or 14.1%, to $2.10 billion, compared to $2.45 billion at December 31, 2017 primarily due to sales of lower yielding AFS securities. Our FHLB stock decreased $23.4 million, or 42.1%, to $32.3 million from $55.7 million at December 31, 2017 due to the reduced level of FHLB borrowings during 2018, reducing the required amount of FHLB stock that we must hold. Our interest earning deposits decreased $40.9 million, or 36.6%, to $70.7 million at September 30, 2018, compared to $111.5 million at December 31, 2017.

Loans decreased $19.8 million, or 0.6%, to $3.27 billion compared to $3.29 billion at December 31, 2017. The net decrease in our loan portfolio was comprised of decreases of $46.4 million of commercial real estate loans, $23.2 million of loans to individuals, $14.1 million of 1-4 family residential loans and $1.0 million in municipal loans, partially offset by increases of $56.5 million of commercial loans and $8.4 million of construction loans.

Our nonperforming assets at September 30, 2018increased 278.5%, to $39.6 million and represented 0.65% of total assets, compared to $10.5 million, or 0.16% of total assets at December 31, 2017.  Nonaccruing loans increased $29.6 million, or 1,007.5%, to $32.5 million and the ratio of nonaccruing loans to total loans increased to 0.99% at September 30, 2018 compared to 0.09% at December 31, 2017.  The increase in nonaccrual loans was primarily the result of the addition of two large commercial real estate relationships consisting of three loans during the first quarter of 2018. Restructured loans were $5.7 million at September 30, 2018, a slight decrease from $5.8 million at December 31, 2017. Other Real Estate Owned (“OREO”) decreased to $1.4 million at September 30, 2018 from $1.6 million at December 31, 2017. There were no repossessed assets at September 30, 2018 compared to $154,000 at December 31, 2017.  

Our deposits increased $38.1 million, or 0.8%, to $4.55 billion at September 30, 2018 from $4.52 billion at December 31, 2017, an increase of $41.9 million in interest earning deposits partially offset by a decrease of $3.8 million in noninterest bearing deposits. The increase in our deposits during 2018 was the result of an increase in private deposits of $140.3 million, partially offset by a decrease in public fund deposits of $102.2 million. Brokered deposits, included in our private deposits, increased $148.0 million, or 236.0%, for the nine months ended September 30, 2018.

Total FHLB borrowings decreased $456.1 million, or 44.8%, to $561.3 million at September 30, 2018 from $1.02 billion at December 31, 2017, while our brokered deposits increased $148.0 million, or 236.0%, to $210.7 million at September 30, 2018 from $62.7 million at December 31, 2017, as we adjusted our overall interest rate risk objectives in response to the Diboll acquisition, the decreases in our securities portfolio and loan portfolio and the rising interest rate market.

Shareholders’ equity at September 30, 2018 totaled $752.5 million compared to $754.1 million at December 31, 2017. The decrease was the result of an increase in accumulated other comprehensive loss of $32.7 million and cash dividends paid of $30.9 million, partially offset by net income of $56.8 million recorded for the nine months ended September 30, 2018, net issuance of common stock under employee stock plans of $2.5 million, stock compensation expense of $1.6 million and common stock issued under our dividend reinvestment plan of $1.1 million.  

Key financial indicators management follows include, but are not limited to, numerous interest rate sensitivity and interest rate risk indicators, credit risk, operations risk, liquidity risk, capital risk, regulatory risk, competition risk, yield curve risk, U.S. Agency MBS prepayment risk and economic risk indicators.

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Balance Sheet Strategy

We utilize wholesale funding and securities to enhance our profitability and balance sheet composition by determining acceptable levels of credit, interest rate and liquidity risk consistent with prudent capital management.  This balance sheet strategy consists of borrowing a combination of long- and short-term funds from the FHLB and, when determined appropriate, issuing brokered CDs.  These funds are invested primarily in U.S. Agency MBS, and to a lesser extent, long-term municipal securities and U.S. Treasury securities.  Although U.S. Agency MBS often carry lower yields than traditional mortgage loans and other types of loans we make, these securities generally (i) increase the overall quality of our assets because of either the implicit or explicit guarantees of the U.S. Government, (ii) are more liquid than individual loans and (iii) may be used to collateralize our borrowings or other obligations.  While the strategy of investing a substantial portion of our assets in U.S. Agency MBS and municipal securities has historically resulted in lower interest rate spreads and margins, we believe the lower operating expenses and reduced credit risk, combined with the managed interest rate risk of this strategy, have enhanced our overall profitability over the last several years.  At this time, we utilize this balance sheet strategy with the goal of enhancing overall profitability by maximizing the use of our capital.

Risks associated with the asset structure we maintain include a lower net interest rate spread and margin when compared to our peers, changes in the slope of the yield curve, which can reduce our net interest rate spread and margin, increase interest rate risk, the length of interest rate cycles, changes in volatility spreads associated with the MBS and municipal securities, the unpredictable nature of MBS prepayments and credit risks associated with the municipal securities.  See “Part I - Item 1A.  Risk Factors – Risks Related to Our Business” in our Annual Report on Form 10-K for the year ended December 31, 2017, for a discussion of risks related to interest rates.  Our asset structure, net interest spread and net interest margin require us to closely monitor our interest rate risk.  An additional risk is the change in fair value of the AFS securities portfolio as a result of changes in interest rates.  Significant increases in interest rates, especially long-term interest rates, could adversely impact the fair value of the AFS securities portfolio, which could also significantly impact our equity capital.  Due to the unpredictable nature of MBS prepayments, the length of interest rate cycles and the slope of the interest rate yield curve, net interest income could fluctuate more than simulated under the scenarios modeled by our ALCO and described under “Item 3.  Quantitative and Qualitative Disclosures about Market Risk” in this Quarterly Report on Form 10-Q.

Determining the appropriate size of the balance sheet is one of the critical decisions any bank makes.  Our balance sheet is not merely the result of a series of micro-decisions, but rather the size is controlled based on the economics of assets compared to the economics of funding. The relatively low, but currently increasing interest rate environment and economic landscape requires that we monitor the interest rate sensitivity of the assets driving our growth and closely align ALCO objectives accordingly.

The management of our securities portfolio as a percentage of earning assets is guided by the current economics associated with increasing the securities portfolio, changes in our overall loan and deposit levels and changes in our wholesale funding levels.  If adequate quality loan growth is not available to achieve our goal of enhancing profitability by maximizing the use of capital, as described above, then we may purchase additional securities, if appropriate, which may cause securities as a percentage of earning assets to increase.  Should we determine that increasing the securities portfolio or replacing the current securities maturities and principal payments is not an efficient use of capital, we may decrease the level of securities through proceeds from maturities, principal payments on MBS or sales.  Our balance sheet strategy is designed such that our securities portfolio should help mitigate financial performance associated with potential business cycles that include slower loan growth and higher credit costs.

Our investment securities and U.S. Agency MBS decreased from $2.45 billion at December 31, 2017 to $2.10 billion at September 30, 2018. The decrease was due to the flattening yield curve, higher funding costs and the realignment of the securities portfolio acquired in the Diboll acquisition to meet our balance sheet strategy and ALCO objectives in this developing interest rate environment.

During the nine months ended September 30, 2018, we sold AFS securities that resulted in an overall loss on the sale of AFS securities of $1.9 million. We primarily sold U.S. Government Agency debentures and mortgage related securities, along with Texas municipals and U.S. Treasury securities.  During the fourth quarter of 2017, we recorded an impairment charge of $234,000 in connection with $109 million of impaired U.S. Agency debentures that we sold during January 2018. The sales of lower yielding fixed rate securities were to help alleviate margin compression brought on by the increase in interest rates by the Federal Reserve. During the nine months ended September 30, 2018, sales of securities were partially offset by purchases of U.S. Agency mortgage related securities, U.S. Treasury securities and Texas municipal securities. We early-adopted ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities” on January 2, 2018, and in conjunction with the adoption, made the transition election to reclassify from HTM to AFS approximately $743.4 million in book value of securities that qualified for the last-of-layer approach.

At September 30, 2018, securities decreased as a percentage of assets to 34.4% as compared to 37.7% at December 31, 2017 due to the $345.6 million, or 14.1%, decrease in the securities portfolio. Our balance sheet management strategy is dynamic and will be continually reevaluated as market conditions warrant.  As interest rates, yield curves, MBS prepayments, funding costs, security spreads and loan and deposit portfolios change, our determination of the proper types, amount and maturities of securities to own,

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as well as funding needs and funding sources, will continue to be reevaluated.  Should the economics of purchasing securities decrease, as it has year to date, we may allow this part of the balance sheet to shrink through run-off or security sales.  However, should the economics become more attractive, we may strategically increase the securities portfolio and the balance sheet.

With respect to liabilities, we continue to utilize a combination of FHLB borrowings and deposits to achieve our strategy of minimizing cost while achieving overall interest rate risk objectives as well as the liability management objectives of the ALCO. FHLB funding is the primary wholesale funding source we are currently utilizing.

Our FHLB borrowings decreased 44.8%, or $456.1 million, to $561.3 million at September 30, 2018 from $1.02 billion at December 31, 2017. From time to time, the Company may enter into various variable rate advance agreements with the FHLB. These advance agreements totaled $310.0 million at September 30, 2018 and $280.0 millionDecember 31, 2017. Two of the variable rate advance agreements have interest rates of three-month LIBOR plus 0.021%, and one has an interest rate of three-month LIBOR minus 0.003%. The remaining advance agreements have interest rates ranging from one-month LIBOR plus 0.072% to one-month LIBOR plus 0.164%. In connection with obtaining these variable rate advance agreements, the Company also entered into various interest rate swap contracts that are treated as cash flow hedges under ASC Topic 815, “Derivatives and Hedging” that effectively converted the variable rate advance agreements to fixed interest rates ranging from 0.932% to 2.8325% and original terms ranging from four years to ten years. The cash flows from the swaps are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the one-month and three-month LIBOR interest rates. During the first quarter of 2017, we terminated two interest rate swap contracts designated as cash flow hedges having a total notional value of $40.0 million. At the time of termination, we determined that the underlying hedged forecasted transactions were still probable of occurring. These transactions are reevaluated on a monthly basis to determine if the hedged forecasted transactions are still probable of occurring. If at a subsequent evaluation it is determined that the transactions will not occur, any related gains or losses recorded in AOCI are immediately recognized in earnings. Refer to “Note 10 - Derivative Financial Instruments and Hedging Activities” in our consolidated financial statements included in this report for a detailed description of our hedging policy and methodology related to derivative instruments.

Our brokered CDs increased 249.7% from $60.2 million at December 31, 2017 to $210.5 million at September 30, 2018, due to lower funding costs currently offered compared to other wholesale funding alternatives and ALCO objectives. At September 30, 2018, approximately $207.6 million of our brokered CDs were non-callable with a weighted average cost of 208 basis points and remaining maturities of less than twelve months. The remaining $3.0 million has a short-term call that we control and matures within fifteen months. Our wholesale funding policy currently allows maximum brokered deposits of $300.0 million; however, this amount could be increased to match changes in ALCO objectives.  The potential higher interest expense and lack of customer loyalty are risks associated with the use of brokered CDs.

During the nine months ended September 30, 2018, the decrease in FHLB borrowings, partially offset by the increase in brokered CDs, resulted in a decrease in our total wholesale funding as a percentage of deposits, not including brokered deposits, to 17.8% at September 30, 2018 from 24.3% at December 31, 2017.

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Results of Operations

Our results of operations are dependent primarily on net interest income, which is the difference between the interest income earned on assets (loans and investments) and interest expense due on our funding sources (deposits and borrowings) during a particular period.  Results of operations are also affected by our noninterest income, provision for loan losses, noninterest expenses and income tax expense.  General economic and competitive conditions, particularly changes in interest rates, changes in interest rate yield curves, prepayment rates of MBS and loans, repricing of loan relationships, government policies and actions of regulatory authorities also significantly affect our results of operations.  Future changes in applicable law, regulations or government policies may also have a material impact on us.

The following table presents net interest income for the periods presented (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
					(in thousands)
Interest income
Loans	$	39,831	$	29,322	$	117,962	$	84,666
Investment securities – taxable	36		58		314		702
Investment securities – tax-exempt	6,331		5,670		19,065		18,381
Mortgage-backed securities	10,086		10,567		31,190		31,430
FHLB stock and other investments	377		329		1,202		926
Other interest earning assets	491		527		1,410		1,265
Total interest income	57,152		46,473		171,143		137,370
Interest expense
Deposits	9,497		5,420		25,529		14,839
FHLB borrowings	3,108		4,156		9,747		11,171
Subordinated notes	1,423		1,413		4,228		4,204
Trust preferred subordinated debentures	684		520		1,911		1,481
Other borrowings	30		4		74		11
Total interest expense	14,742		11,513		41,489		31,706
Net interest income	$	42,410	$	34,960	$	129,654	$	105,664

Net Interest Income

Net interest income is one of the principal sources of a financial institution’s earnings stream and represents the difference or spread between interest and fee income generated from interest earning assets and the interest expense paid on deposits and borrowed funds.  Fluctuations in interest rates or interest rate yield curves, as well as repricing characteristics and volume and changes in the mix of interest earning assets and interest bearing liabilities, materially impact net interest income.

Net interest income for the three months ended September 30, 2018increased $7.5 million, or 21.3%, to $42.4 million, compared to $35.0 million for the same period in 2017. The increase in net interest income for the three months ended September 30, 2018, compared to the same period in 2017, was due primarily to the increase in interest income from our loan portfolio, partially offset by the increase in interest expense on our deposits. Total interest income increased $10.7 million, or 23.0%, to $57.2 million during the three months ended September 30, 2018, compared to $46.5 million during the same period in 2017. Total interest expense increased $3.2 million, or 28.0%, to $14.7 million during the three months ended September 30, 2018, compared to $11.5 million during the same period in 2017.

Net interest income for the nine months ended September 30, 2018increased $24.0 million, or 22.7%, to $129.7 million, compared to $105.7 million for the same period in 2017. The increase in net interest income for the nine months ended September 30, 2018, compared to the same period in 2017, was due to the increase in interest income primarily from our loan portfolio, partially offset by the increase in interest expense on deposits. Total interest income increased $33.8 million, or 24.6%, to $171.1 million during the nine months ended September 30, 2018, compared to $137.4 million during the same period in 2017. Total interest expense increased $9.8 million, or 30.9%, to $41.5 million during the nine months ended September 30, 2018, compared to $31.7 million during the same period in 2017.

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The “Average Balances with Average Yields and Rates” table that follows shows average earning assets and interest bearing liabilities together with the average yield on the earning assets and the average rate of the interest bearing liabilities (dollars in thousands) for the three months ended September 30, 2018 and 2017. The interest and related yields presented are on a fully taxable-equivalent basis and are therefore non-GAAP measures. See "Non-GAAP Financial Measures" for more information, and for a reconciliation to GAAP.

	Average Balances with Average Yields and Rates
	(unaudited)
	Three Months Ended
	September 30, 2018							September 30, 2017
	Avg Balance			Interest		Avg Yield/Rate		Avg Balance			Interest		Avg Yield/Rate
ASSETS
Loans (1)	$	3,286,664		$	40,396	4.88	%	$	2,657,562		$	30,378	4.54	%
Loans held for sale	1,841			25		5.39	%	5,060			47		3.69	%
Securities:
Investment securities (taxable) (2)	4,285			36		3.33	%	11,085			58		2.08	%
Investment securities (tax-exempt) (2)	795,397			8,132		4.06	%	758,828			9,214		4.82	%
Mortgage-backed and related securities (2)	1,418,114			10,086		2.82	%	1,550,494			10,567		2.70	%
Total securities	2,217,796			18,254		3.27	%	2,320,407			19,839		3.39	%
FHLB stock, at cost, and equity investments	54,216			377		2.76	%	66,994			329		1.95	%
Interest earning deposits	77,977			414		2.11	%	144,700			506		1.39	%
Federal funds sold	16,072			77		1.90	%	4,626			21		1.80	%
Total earning assets	5,654,566			59,543		4.18	%	5,199,349			51,120		3.90	%
Cash and due from banks	78,623							53,220
Accrued interest and other assets	477,737							360,073
Less:  Allowance for loan losses	(25,646		)					(19,556		)
Total assets	$	6,185,280						$	5,593,086
LIABILITIES AND SHAREHOLDERS’ EQUITY
Savings deposits	$	362,405		258		0.28	%	$	260,860		117		0.18	%
Time deposits	1,173,672			4,744		1.60	%	988,380			2,878		1.16	%
Interest bearing demand deposits	1,953,904			4,495		0.91	%	1,562,993			2,425		0.62	%
Total interest bearing deposits	3,489,981			9,497		1.08	%	2,812,233			5,420		0.76	%
FHLB borrowings	654,153			3,108		1.88	%	1,237,055			4,156		1.33	%
Subordinated notes, net of unamortized debt issuance costs	98,346			1,423		5.74	%	98,190			1,413		5.71	%
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,244			684		4.50	%	60,239			520		3.42	%
Other borrowings	9,651			30		1.23	%	8,425			4		0.19	%
Total interest bearing liabilities	4,312,375			14,742		1.36	%	4,216,142			11,513		1.08	%
Noninterest bearing deposits	1,064,797							773,739
Accrued expenses and other liabilities	48,699							48,682
Total liabilities	5,425,871							5,038,563
Shareholders’ equity	759,409							554,523
Total liabilities and shareholders’ equity	$	6,185,280						$	5,593,086
Net interest income (FTE)				$	44,801						$	39,607
Net interest margin (FTE)						3.14	%						3.02	%
Net interest spread (FTE)						2.82	%						2.82	%

(1) Interest on loans includes net fees on loans that are not material in amount.

(2) For the purpose of calculating the average yield, the average balance of securities is presented at historical cost.

Note: As of September 30, 2018 and 2017, loans totaling $32.5 million and $3.1 million, respectively, were on nonaccrual status. Our policy is to reverse previously accrued but unpaid interest on nonaccrual loans; thereafter, interest income is recorded to the extent received when appropriate.

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Quarterly Analysis of Changes in Interest Income and Interest Expense

The following table presents on a fully taxable-equivalent basis, a non-GAAP measure, the net change in net interest income and sets forth the dollar amount of increase (decrease) in the average volume of interest earning assets and interest bearing liabilities and from changes in yields/rates. Volume/Yield/Rate variances (change in volume times change in yield/rate) have been allocated to amounts attributable to changes in volumes and to changes in yields/rates in proportion to the amounts directly attributable to those changes (in thousands):

	Three Months Ended September 30, 2018 Compared to 2017
	Change Attributable to						Total
Fully Taxable-Equivalent Basis:	Average Volume			Average Yield/Rate			Change
Interest income on:
Loans (1)	$	7,602		$	2,416		$	10,018
Loans held for sale	(38		)	16			(22		)
Investment securities (taxable)	(46		)	24			(22		)
Investment securities (tax-exempt) (1)	428			(1,510		)	(1,082		)
Mortgage-backed securities	(928		)	447			(481		)
FHLB stock, at cost, and equity investments	(71		)	119			48
Interest earning deposits	(290		)	198			(92		)
Federal funds sold	55			1			56
Total earning assets	6,712			1,711			8,423
Interest expense on:
Savings deposits	56			85			141
Time deposits	608			1,258			1,866
Interest bearing demand deposits	706			1,364			2,070
FHLB borrowings	(2,390		)	1,342			(1,048		)
Subordinated notes, net of unamortized debt issuance costs	2			8			10
Trust preferred subordinated debentures, net of unamortized debt issuance costs	—			164			164
Other borrowings	1			25			26
Total interest bearing liabilities	(1,017		)	4,246			3,229
Net change	$	7,729		$	(2,535	)	$	5,194

(1) Interest yields on loans and securities that are nontaxable for federal income tax purposes are presented on a fully taxable-equivalent basis. See “Non-GAAP Financial Measures.”

The increase in total interest income was primarily attributable to the increase in average earning assets of $455.2 million, or 8.8%, to $5.65 billion for the three months ended September 30, 2018 from $5.20 billion for the same period in 2017, and to a lesser extent, the increase in the average yield on earning assets to 4.18% for the three months ended September 30, 2018 from 3.90% for the three months ended September 30, 2017. The increase in average earning assets was primarily the result of the acquisition of Diboll in the fourth quarter of 2017, partially offset by decreases in the securities portfolio and interest earning deposits during 2018. The increase in the average yield on total earning assets during the three months ended September 30, 2018 was primarily due to rising interest rates during 2017 and 2018.

The increase in total interest expense for the three months ended September 30, 2018 was primarily attributable to the increase in the average rates paid on total interest bearing liabilities to 1.36% for the three months ended September 30, 2018 from 1.08% for the three months ended September 30, 2017, and to a lesser extent, an increase in average interest bearing deposits.  The increase in average interest-bearing liabilities was also a result of the acquisition of Diboll during the fourth quarter of 2017, partially offset by a decrease in FHLB borrowings. The increase in average rates paid on interest bearing liabilities was primarily due to rising interest rates during 2017 and 2018.

Our net interest margin (FTE) increased to 3.14% for the three months ended September 30, 2018, compared to 3.02% for the same period in 2017 and our net interest spread (FTE) remained unchanged at 2.82% for the three months ended September 30, 2018 and 2017.

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The “Average Balances with Average Yields and Rates” table that follows shows average earning assets and interest bearing liabilities together with the average yield on the earning assets and the average rate of the interest bearing liabilities (dollars in thousands) for the nine months ended September 30, 2018 and 2017. The interest and related yields presented are on a fully taxable-equivalent basis and are therefore non-GAAP measures. See "Non-GAAP Financial Measures" for more information, and for a reconciliation to GAAP.

	Average Balances with Average Yields and Rates
	(unaudited)
	Nine Months Ended
	September 30, 2018							September 30, 2017
	Avg Balance			Interest		Avg Yield/Rate		Avg Balance			Interest		Avg Yield/Rate
ASSETS
Loans (1)	$	3,290,925		$	119,662	4.86	%	$	2,588,358		$	87,699	4.53	%
Loans held for sale	1,727			55		4.26	%	5,992			155		3.46	%
Securities:
Investment securities (taxable) (2)	16,707			314		2.51	%	51,645			702		1.82	%
Investment securities (tax-exempt) (2)	800,998			24,136		4.03	%	762,543			28,529		5.00	%
Mortgage-backed and related securities (2)	1,471,179			31,190		2.83	%	1,571,685			31,430		2.67	%
Total securities	2,288,884			55,640		3.25	%	2,385,873			60,661		3.40	%
FHLB stock, at cost, and equity investments	58,601			1,202		2.74	%	66,763			926		1.85	%
Interest earning deposits	92,477			1,213		1.75	%	154,289			1,216		1.05	%
Federal funds sold	15,202			197		1.73	%	5,713			49		1.15	%
Total earning assets	5,747,816			177,969		4.14	%	5,206,988			150,706		3.87	%
Cash and due from banks	77,407							52,568
Accrued interest and other assets	481,279							356,212
Less:  Allowance for loan losses	(23,753		)					(18,732		)
Total assets	$	6,282,749						$	5,597,036
LIABILITIES AND SHAREHOLDERS’ EQUITY
Savings deposits	$	358,870		650		0.24	%	$	258,568		330		0.17	%
Time deposits	1,173,000			12,942		1.48	%	976,919			7,828		1.07	%
Interest bearing demand deposits	1,981,293			11,937		0.81	%	1,628,477			6,681		0.55	%
Total interest bearing deposits	3,513,163			25,529		0.97	%	2,863,964			14,839		0.69	%
FHLB borrowings	757,399			9,747		1.72	%	1,250,563			11,171		1.19	%
Subordinated notes, net of unamortized debt issuance costs	98,307			4,228		5.75	%	98,153			4,204		5.73	%
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,242			1,911		4.24	%	60,238			1,481		3.29	%
Other borrowings	9,018			74		1.10	%	7,770			11		0.19	%
Total interest bearing liabilities	4,438,129			41,489		1.25	%	4,280,688			31,706		0.99	%
Noninterest bearing deposits	1,042,432							732,637
Accrued expenses and other liabilities	47,591							42,749
Total liabilities	5,528,152							5,056,074
Shareholders’ equity	754,597							540,962
Total liabilities and shareholders’ equity	$	6,282,749						$	5,597,036
Net interest income (FTE)				$	136,480						$	119,000
Net interest margin (FTE)						3.17	%						3.06	%
Net interest spread (FTE)						2.89	%						2.88	%

(1) Interest on loans includes net fees on loans that are not material in amount.

(2) For the purpose of calculating the average yield, the average balance of securities is presented at historical cost.

Note: As of September 30, 2018 and 2017, loans totaling $32.5 million and $3.1 million, respectively, were on nonaccrual status. Our policy is to reverse previously accrued but unpaid interest on nonaccrual loans; thereafter, interest income is recorded to the extent received when appropriate.

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Year-to-Date Analysis of Changes in Interest Income and Interest Expense

The following table presents on a fully taxable-equivalent basis, a non-GAAP measure, the net change in net interest income and sets forth the dollar amount of increase (decrease) in the average volume of interest earning assets and interest bearing liabilities and from changes in yields/rates. Volume/Yield/Rate variances (change in volume times change in yield/rate) have been allocated to amounts attributable to changes in volumes and to changes in yields/rates in proportion to the amounts directly attributable to those changes (in thousands):

	Nine Months Ended September 30, 2018 Compared to 2017
	Change Attributable to						Total
Fully Taxable-Equivalent Basis:	Average Volume			Average Yield/Rate			Change
Interest income on:
Loans (1)	$	25,176		$	6,787		$	31,963
Loans held for sale	(130		)	30			(100		)
Investment securities (taxable)	(591		)	203			(388		)
Investment securities (tax-exempt) (1)	1,381			(5,774		)	(4,393		)
Mortgage-backed securities	(2,072		)	1,832			(240		)
FHLB stock, at cost, and equity investments	(124		)	400			276
Interest earning deposits	(609		)	606			(3		)
Federal funds sold	113			35			148
Total earning assets	23,144			4,119			27,263
Interest expense on:
Savings deposits	154			166			320
Time deposits	1,777			3,337			5,114
Interest bearing demand deposits	1,662			3,594			5,256
FHLB borrowings	(5,322		)	3,898			(1,424		)
Subordinated notes, net of unamortized debt issuance costs	7			17			24
Trust preferred subordinated debentures, net of unamortized debt issuance costs	—			430			430
Other borrowings	2			61			63
Total interest bearing liabilities	(1,720		)	11,503			9,783
Net change	$	24,864		$	(7,384	)	$	17,480

(1) Interest yields on loans and securities that are nontaxable for federal income tax purposes are presented on a fully taxable-equivalent basis. See “Non-GAAP Financial Measures.”

The increase in total interest income was primarily attributable to the increase in average earning assets of $540.8 million, or 10.4%, to $5.75 billion for the nine months ended September 30, 2018 from $5.21 billion for the same period in 2017, and to a lesser extent, the increase in the average yield on earning assets to 4.14% for the nine months ended September 30, 2018 from 3.87% for the nine months ended September 30, 2017. The increase in average earning assets was primarily the result of the acquisition of Diboll in the fourth quarter of 2017, partially offset by decreases in the securities portfolio and interest earning deposits during 2018. The increase in the average yield on total earning assets during the nine months ended September 30, 2018 was primarily due to rising interest rates during 2017 and 2018.

The increase in total interest expense for the nine months ended September 30, 2018 was primarily attributable to the increase in the average rates paid on total interest bearing liabilities to 1.25% for the nine months ended September 30, 2018 from 0.99% for the nine months ended September 30, 2018, and to a lesser extent, the increase in average interest bearing liabilities of $157.4 million, or 3.7%, to $4.44 billion during the nine months ended September 30, 2018 from $4.28 billion during the nine months ended September 30, 2017.  The increase in average interest-bearing liabilities was also a result of the acquisition of Diboll during the fourth quarter of 2017, partially offset by a decrease in FHLB borrowings. The increase in average rates paid on interest bearing liabilities was primarily due to rising interest rates during 2017 and 2018.

Our net interest margin (FTE) increased to 3.17% for the nine months ended September 30, 2018, compared to 3.06% for the same period in 2017 and our net interest spread (FTE) increased slightly to 2.89%, compared to 2.88% for the same period in 2017.

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Noninterest Income

Noninterest income consists of revenue generated from a broad range of financial services and activities and other fee generating services that we either provide or in which we participate.

In connection with the adoption of Accounting Standards Update 2014-09 “Revenue from Contracts with Customers (Topic 606)” effective January 1, 2018, for the three and nine months ended September 30, 2018, debit card expense and brokerage service expense previously reported in ATM and debit card expense and other noninterest expense are now netted with deposit services income and brokerage services income, respectively. Due to the guidance under the modified retrospective method, prior periods have not been adjusted and therefore, are not comparable.

The following table details the categories included in noninterest income (dollars in thousands):

	Three Months Ended September 30,					2018					Nine Months Ended September 30,					2018
						Change From										Change From
	2018			2017		2017					2018			2017		2017
Deposit services	$	6,317		$	5,476	$	841		15.4	%	$	18,757		$	15,845	$	2,912		18.4	%
Net (loss) gain on sale of securities available for sale	(741		)	627		(1,368		)	(218.2	)%	(1,900		)	874		(2,774		)	(317.4	)%
Gain on sale of loans	303			347		(44		)	(12.7	)%	591			1,553		(962		)	(61.9	)%
Trust income	1,568			873		695			79.6	%	5,259			2,662		2,597			97.6	%
Bank owned life insurance income	552			636		(84		)	(13.2	)%	2,369			1,905		464			24.4	%
Brokerage services	532			561		(29		)	(5.2	)%	1,488			1,790		(302		)	(16.9	)%
Other noninterest income	1,491			888		603			67.9	%	4,075			3,745		330			8.8	%
Total noninterest income	$	10,022		$	9,408	$	614		6.5	%	$	30,639		$	28,374	$	2,265		8.0	%

The 6.5%increase in noninterest income for the three months ended September 30, 2018 when compared to the same period in 2017, was primarily due to increases in deposit services income, trust income and other noninterest income, partially offset by a net loss on sale of securities available for sale.

The 8.0%increase in noninterest income for the nine months ended September 30, 2018 when compared to the same period in 2017, was primarily due to increases in deposit services income and trust income, partially offset by a net loss on sale of securities available for sale and a decrease in gain on sale of loans.

The increase in deposit services income is primarily a result of increased deposit accounts related to the Diboll acquisition on November 30, 2017. Deposit services consists of income of $7.3 million and $21.6 million prior to netting the debit card expense of $1.0 million and $2.8 million for the three and nine months ended September 30, 2018, respectively.

During the nine months ended September 30, 2018, we sold U.S. Government Agency debentures and mortgage related securities, U.S. Treasury securities, and Texas municipal securities that resulted in a net loss on sale of AFS securities of $741,000 and $1.9 million for the three and nine months ended September 30, 2018, respectively.

The decrease in gain on sale of loans for the three and nine months ended September 30, 2018 was primarily due to a decline in the volume of loans sold.

The increase in trust income for the three and nine months ended September 30, 2018 was primarily due to the increase in assets under management, a direct result of the Diboll acquisition.

The decrease in bank owned life insurance income during the three months ended September 30, 2018 was primarily due to a decrease in bank owned life insurance of $2.8 million since December 31, 2017. The increase in bank owned life insurance income for the nine months ended September 30, 2018 was primarily due to the death benefits realized in the second quarter of 2018 for a retired covered officer.

The decrease in brokerage services income is a direct result of netting the brokerage services expense. Brokerage services consist of income $704,000 and $2.0 million prior to the netting of brokerage services expense of $172,000 and $474,000 for the three and nine months ended September 30, 2018, respectively.

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Other noninterest income increased during the three months ended September 30, 2018 primarily due to increases in swap fee income, mortgage servicing fee income and letter of credit fees. The increase in other noninterest income during the nine months ended September 30, 2018 was due to an increase in letter of credit fees, increases in mortgage servicing fee income and increases in various fee based services due to the higher volume of activity related to the Diboll acquisition which were partially offset by a decrease in swap fee income.

Noninterest Expense

We incur certain types of noninterest expenses associated with the operation of our various business activities. The following table details the categories included in noninterest expense (dollars in thousands):

	Three Months Ended September 30,				2018					Nine Months Ended September 30,				2018
					Change From									Change From
	2018		2017		2017					2018		2017		2017
Salaries and employee benefits	$	17,628	$	14,472	$	3,156		21.8	%	$	52,820	$	45,463	$	7,357		16.2	%
Occupancy expense	3,396		2,981		415			13.9	%	10,339		8,741		1,598			18.3	%
Acquisition expense	437		405		32			7.9	%	2,295		878		1,417			161.4	%
Advertising, travel & entertainment	648		487		161			33.1	%	2,108		1,618		490			30.3	%
ATM and debit card expense	251		1,024		(773		)	(75.5	)%	840		2,840		(2,000		)	(70.4	)%
Professional fees	824		996		(172		)	(17.3	)%	2,846		2,985		(139		)	(4.7	)%
Software and data processing expense	977		732		245			33.5	%	2,939		2,145		794			37.0	%
Telephone and communications	354		459		(105		)	(22.9	)%	1,370		1,461		(91		)	(6.2	)%
FDIC insurance	435		441		(6		)	(1.4	)%	1,416		1,327		89			6.7	%
Amortization expense on intangibles	1,279		388		891			229.6	%	3,985		1,229		2,756			224.2	%
Other noninterest expense	2,733		2,622		111			4.2	%	8,945		7,715		1,230			15.9	%
Total noninterest expense	$	28,962	$	25,007	$	3,955		15.8	%	$	89,903	$	76,402	$	13,501		17.7	%

The increase in noninterest expense for the three and nine months ended September 30, 2018 compared to the same periods in 2017, was primarily the result of the acquisition of Diboll on November 30, 2017 and certain other factors as identified below.

Salary and employee benefits increased for the three and nine months ended September 30, 2018 compared to the same periods in 2017, due to increases in direct salary expense, insurance expense and retirement expense. Direct salary expense increased $2.6 million, or 20.6%, and $6.7 million, or 17.2%, during the three and nine months ended September 30, 2018, respectively, compared to the same periods in 2017 due to additional employees as a result of the acquisition of Diboll and one-time bonus payments in the first quarter of $744,000 to certain employees in response to the benefits received from the Tax Cuts and Jobs Act, and to a lesser extent, normal salary increases effective in the first quarter of 2018.

Health and life insurance expense increased $321,000, or 25.6%, and $598,000, or 14.5%, during the three and nine months ended September 30, 2018, respectively, compared to the same periods in 2017. We have a self-insured health plan which is supplemented with stop loss insurance policies. Health insurance costs are rising nationwide and these costs may continue to increase during the remainder of 2018.

Retirement expense increased $265,000, or 34.6%, and $36,000, or 1.6%, for the three and nine months ended September 30, 2018, respectively, compared to the same periods in 2017, due to increases in our defined benefit pension and restoration plan expense as well as 401(k) Plan matching expense and ESOP expense. The increase during the nine months ended September 30, 2018 was partially offset by the reversal of a split dollar liability related to the death of a retired covered officer during the second quarter of 2018.

Occupancy expense increased during the three and nine months ended September 30, 2018 compared to the same periods in 2017 due to increased depreciation, real estate taxes and various other occupancy related expense associated with the Diboll locations acquired. Also included in occupancy expense is additional rent expense of $164,000 recorded during the first quarter of 2018 in connection with the closure of one of our retail branches located within close proximity to an acquired Diboll location.

For the three months ended September 30, 2018, acquisition expense consisted of $330,000 in additional professional fees related primarily to systems integration and $107,000 in change in control payment accruals. For the nine months ended September 30, 2018, acquisition expense consisted of $1.2 million in change in control payment accruals and severance payments, $1.1 million

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in additional professional fees and $44,000 in travel expenses, both of the latter related primarily to systems integration. Acquisition expense for the three and nine months ended September 30, 2017, was primarily for professional fees.

Advertising, travel and entertainment expense increased during the three and nine months ended September 30, 2018 compared to the same periods in 2017 primarily due to the integration of Diboll.

ATM and debit card expense decreased for the three and nine months ended September 30, 2018 compared to the same periods in 2017. In connection with the application of ASU 2014-09 effective January 1, 2018, debit card expense related to interchange revenue of $1.0 million and $2.8 million for the three and nine months ended September 30, 2018, respectively, is now netted with deposit services income as part of noninterest income. Due to the implementation of the guidance under the modified retrospective method, prior periods have not been adjusted and therefore, are not comparable.

Software and data processing expense increased for the three and nine months ended September 30, 2018 compared to the same periods in 2017 primarily due to the additional data processing expense and integration costs in connection with the acquisition of Diboll.

Amortization expense on intangibles increased for the three and nine months ended September 30, 2018 as compared to the same periods in 2017. The increase in 2018 was due to increased amortization related to both the core deposit intangible and trust relationship intangible recorded with the Diboll acquisition on November 30, 2017.

The increase in other noninterest expense for the three and nine months ended September 30, 2018 compared to the same periods in 2017, was primarily due to increases in losses on loans sold with recourse and other real estate owned, trust expense, losses on retired assets and an overall general increase in other noninterest expenses directly related to the acquisition of Diboll, partially offset by a decrease in losses on unfunded loan commitments.

Income Taxes

Pre-tax income for the three and nine months ended September 30, 2018 was $22.5 million and $64.4 million, respectively, compared to $18.4 million and $54.2 million for the same periods in 2017. We recorded income tax expense of $2.2 million and $7.6 million for the three and nine months ended September 30, 2018, respectively, compared to income tax expense of $3.9 million and $10.3 million for the same periods in 2017. The effective tax rate (“ETR”) as a percentage of pre-tax income was 9.7% and 11.9% for the three and nine months ended September 30, 2018, respectively, compared to an ETR as a percentage of pre-tax income of 21.1% and 18.9% for the same periods in 2017.   The lower ETR for the three and nine months ended September 30, 2018 compared to the same periods in 2017 was mainly due to the reduced corporate tax rate from 35% to 21% under the Tax Cuts and Jobs Act (“Tax Act”) enacted on December 22, 2017. Additionally, during the three and nine months ended September 30, 2018, we recorded approximately $800,000 of tax benefit associated with the remeasurement of our net deferred tax asset, lowering the ETR by 3.6% and 1.2%, respectively.

The ETR differs from the stated rate of 21% and 35% for the three and nine months ended September 30, 2018 and 2017, respectively, primarily due to tax-exempt income from municipal loans and securities, as well as, bank owned life insurance. The net deferred tax asset totaled $16.4 million at September 30, 2018 as compared to $12.2 million at December 31, 2017. The $4.2 millionincrease in the net deferred tax asset is primarily the result of the increase in unrealized loss in the AFS securities portfolio offset by a portion of the alternative minimum tax credit realized. We remeasured certain deferred tax assets and liabilities as of December 22, 2017 based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing certain aspects of the Tax Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts.

See “Note 12-Income Taxes” to our consolidated financial statements included in this report. No valuation allowance for the net deferred tax asset was recorded at September 30, 2018 or December 31, 2017, as management believes it is more likely than not that all of the net deferred tax asset will be realized in future years.

Liquidity and Interest Rate Sensitivity

Liquidity management involves our ability to convert assets to cash with a minimum risk of loss to enable us to meet our obligations to our customers at any time.  This means addressing (1) the immediate cash withdrawal requirements of depositors and other fund providers; (2) the funding requirements of all lines and letters of credit; and (3) the short-term credit needs of customers.  Liquidity is provided by short-term investments that can be readily liquidated with a minimum risk of loss.  Cash, interest earning deposits and short-term investments with maturities or repricing characteristics of one year or less continue to be a substantial percentage of our total assets.  At September 30, 2018, these investments were 5.0% of total assets, as compared with 6.9% for December 31, 2017 and 6.7% for September 30, 2017. The decrease to 5.0% at September 30, 2018 is primarily reflective of changes in the investment portfolio combined with a decrease in our interest earning deposits. Liquidity is further provided through the matching, by time period, of rate sensitive interest earning assets with rate sensitive interest bearing

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liabilities.  Southside Bank has three unsecured lines of credit for the purchase of overnight federal funds at prevailing rates with Frost Bank, TIB-The Independent Bankers Bank and Comerica Bank for $40.0 million, $15.0 million and $7.5 million, respectively.  There were no federal funds purchased at September 30, 2018 or December 31, 2017.  Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit and at September 30, 2018 we had one outstanding letter of credit for $195,000.  At September 30, 2018, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by FHLB stock, nonspecified loans and securities, was approximately $1.25 billion, net of FHLB stock purchases required.  Southside Bank currently has no outstanding letters of credit from FHLB held as collateral for its public fund deposits.

Interest rate sensitivity management seeks to avoid fluctuating net interest margins and to enhance consistent growth of net interest income through periods of changing interest rates.  The ALCO closely monitors various liquidity ratios and interest rate spreads and margins.  The ALCO utilizes a simulation model to perform interest rate simulation tests that apply various interest rate scenarios including immediate shocks and market value of portfolio equity (“MVPE”) with interest rates immediately shocked plus and minus 200 basis points, among others to assist in determining our overall interest rate risk and the adequacy of our liquidity position.  In addition, the ALCO utilizes this simulation model to determine the impact on net interest income of various interest rate scenarios.  By utilizing this technology, we can determine changes that need to be made to the asset and liability mix to minimize the change in net interest income under these various interest rate scenarios. See Part I - “Item 3. Quantitative and Qualitative Disclosures about Market Risk” in this Quarterly Report on Form 10-Q.

Capital Resources

Our total shareholders’ equity at September 30, 2018decreased 0.2%, or $1.6 million, to $752.5 million, or 12.3% of total assets, compared to $754.1 million, or 11.6% of total assets at December 31, 2017.

The decrease in shareholders’ equity was the result of an increase in accumulated other comprehensive loss of $32.7 million and cash dividends paid of $30.9 million, partially offset by net income of $56.8 million recorded for the nine months ended September 30, 2018, net issuance of common stock under employee stock plans of $2.5 million, stock compensation expense of $1.6 million and common stock issued under our dividend reinvestment plan of $1.1 million.  

As a result of regulations, which became applicable to the Company and the Bank on January 1, 2015, we are required to comply with higher minimum capital requirements (the “Updated Capital Rules”). The Updated Capital Rules made substantial changes to previous capital standards. Among other things, the regulations (i) introduced a new capital requirement known as “Common Equity Tier 1” (“CET1”), (ii) stated that Tier 1 capital consists of CET1 and “Additional Tier 1 capital” instruments meeting certain requirements, (iii) defined CET1 to require that most deductions and adjustments to regulatory capital measures be made to CET1 and not to the other components of capital and (iv) revised the scope of the deductions and adjustments from capital as compared to regulations that previously applied to the Company and other banking organizations.

The Updated Capital Rules also established the following minimum capital ratios, which started to phase in on January 1, 2015: 4.5 percent CET1 to risk-weighted assets; 6.0 percent Tier 1 capital to risk-weighted assets; 8.0 percent total capital to risk-weighted assets; and 4.0 percent Tier 1 leverage ratio to average consolidated assets. In addition, the Updated Capital Rules also introduced a minimum “capital conservation buffer” equal to 2.5% of an organization’s total risk-weighted assets, which exists in addition to the required minimum CET1, Tier 1, and total capital ratios. The “capital conservation buffer,” which must consist entirely of CET1, is designed to absorb losses during periods of economic stress. The Updated Capital Rules provide for a number of deductions from and adjustments to CET1, which include the requirement that mortgage servicing rights, deferred tax assets arising from temporary differences that could not be realized through net operating loss carry-backs and significant investments in non-consolidated financial entities be deducted from CET1 to the extent that any one such category exceeds 10% of CET1 or all such categories in the aggregate exceed 15% of CET1.

Under the previous capital framework, the effects of accumulated other comprehensive income items included in shareholders’ equity under U.S. GAAP were excluded for the purposes of determining capital ratios. Under the Updated Capital Rules, the company has elected to permanently exclude capital in accumulated other comprehensive income in Common Equity Tier 1 capital, Tier 1 capital, Total capital to risk-weighted assets and Tier 1 capital to adjusted quarterly average assets.

Under the Updated Capital Rules, certain hybrid securities, such as trust preferred securities, do not qualify as Tier 1 capital. For bank holding companies that had assets of less than $15 billion as of December 31, 2009, which includes Southside, trust preferred securities issued prior to May 19, 2010 can be treated as Tier 1 capital to the extent that they do not exceed 25% of Tier 1 capital after the application of capital deductions and adjustments.

Failure to meet minimum capital requirements under the Updated Capital Rules could result in certain mandatory and possibly additional discretionary actions by our regulators that, if undertaken, could have a direct material effect on our financial statements. Management believes that, as of September 30, 2018, we met all capital adequacy requirements to which we were subject.

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The Federal Deposit Insurance Act requires bank regulatory agencies to take “prompt corrective action” with respect to FDIC-insured depository institutions that do not meet minimum capital requirements.  A depository institution’s treatment for purposes of the prompt corrective action provisions will depend on how its capital levels compare to various capital measures and certain other factors, as established by regulation.  Prompt corrective action and other discretionary actions could have a direct material effect on our financial statements.

It is management’s intention to maintain our capital at a level acceptable to all regulatory authorities and future dividend payments will be determined accordingly.  Regulatory authorities require that any dividend payments made by either us or the Bank not exceed earnings for that year.  Accordingly, shareholders should not anticipate a continuation of the cash dividend payments simply because of the existence of a dividend reinvestment program.  The payment of dividends will depend upon future earnings, our financial condition and other related factors including the discretion of the board of directors.

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To be categorized as well capitalized we must maintain minimum Common Equity Tier 1 risk-based, Tier 1 risk-based, Total capital risk-based and Tier 1 leverage ratios as set forth in the following table:

	Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Actions Provisions
	Amount		Ratio		Amount		Ratio		Amount		Amount
September 30, 2018	(dollars in thousands)
Common Equity Tier 1 (to Risk Weighted Assets)
Consolidated	$	605,027	15.90	%	$	171,280	4.50	%	N/A		N/A
Bank Only	$	736,282	19.35	%	$	171,187	4.50	%	$	247,270	6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Consolidated	$	663,460	17.43	%	$	228,374	6.00	%	N/A		N/A
Bank Only	$	736,282	19.35	%	$	228,249	6.00	%	$	304,332	8.00	%
Total Capital (to Risk Weighted Assets)
Consolidated	$	789,721	20.75	%	$	304,498	8.00	%	N/A		N/A
Bank Only	$	764,177	20.09	%	$	304,332	8.00	%	$	380,415	10.00	%
Tier 1 Capital (to Average Assets) (1)
Consolidated	$	663,460	11.06	%	$	239,904	4.00	%	N/A		N/A
Bank Only	$	736,282	12.28	%	$	239,816	4.00	%	$	299,770	5.00	%

	Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Actions Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2017	(dollars in thousands)
Common Equity Tier 1 (to Risk Weighted Assets)
Consolidated	$	570,610	14.65	%	$	175,216	4.50	%	N/A		N/A
Bank Only	$	711,157	18.27	%	$	175,145	4.50	%	$	252,987	6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Consolidated	$	627,532	16.12	%	$	233,621	6.00	%	N/A		N/A
Bank Only	$	711,157	18.27	%	$	233,527	6.00	%	$	311,369	8.00	%
Total Capital (to Risk Weighted Assets)
Consolidated	$	748,532	19.22	%	$	311,495	8.00	%	N/A		N/A
Bank Only	$	733,909	18.86	%	$	311,369	8.00	%	$	389,211	10.00	%
Tier 1 Capital (to Average Assets) (1)
Consolidated	$	627,532	11.16	%	$	224,844	4.00	%	N/A		N/A
Bank Only	$	711,157	12.66	%	$	224,741	4.00	%	$	280,926	5.00	%

(1) Refers to quarterly average assets as calculated in accordance with policies established by bank regulatory agencies.

Management believes that, as of September 30, 2018, Southside Bancshares and Southside Bank would meet all capital adequacy requirements under the Basel III Capital Rules on a fully phased-in basis as if such requirements were currently in effect.

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The table below summarizes our key equity ratios for the three and nine months ended September 30, 2018 and 2017:

	Three Months Ended September 30,
	2018		2017
Return on Average Assets	1.30	%	1.03	%
Return on Average Shareholders’ Equity	10.61		10.38
Dividend Payout Ratio – Basic	51.72		57.14
Dividend Payout Ratio – Diluted	51.72		57.14
Average Shareholders’ Equity to Average Total Assets	12.28		9.91
	Nine Months Ended September 30,
	2018		2017
Return on Average Assets	1.21	%	1.05	%
Return on Average Shareholders’ Equity	10.06		10.87
Dividend Payout Ratio – Basic	54.32		54.00
Dividend Payout Ratio – Diluted	54.66		54.36
Average Shareholders’ Equity to Average Total Assets	12.01		9.67

Composition of Loans

One of our main objectives is to seek attractive lending opportunities in Texas, primarily in the counties in which we operate. Refer to “Part I - Item 1. Business - Market Area” in our Annual Report on Form 10-K for the year ended December 31, 2017 for a discussion of our primary market area and the geographic concentration of our loan portfolio as of December 31, 2017.  There were no substantial changes in these concentrations during the nine months ended September 30, 2018.  Substantially all of our loan originations are made to borrowers who live in and conduct business in the counties in Texas in which we operate or adjoin, with the exception of municipal loans, which are made primarily throughout the state of Texas.  Municipal loans are made to municipalities, counties, school districts and colleges.

The following table sets forth loan totals by class as of the dates presented (dollars in thousands):

							Compared to
							December 31, 2017		September 30, 2017
	September 30, 2018		December 31, 2017		September 30, 2017		Change (%)		Change (%)
Real Estate Loans:
Construction	$	484,254	$	475,867	$	420,497	1.8	%	15.2	%
1-4 Family Residential	791,274		805,341		609,159		(1.7	)%	29.9	%
Commercial	1,218,714		1,265,159		1,073,646		(3.7	)%	13.5	%
Commercial Loans	322,873		266,422		166,919		21.2	%	93.4	%
Municipal Loans	344,792		345,798		322,286		(0.3	)%	7.0	%
Loans to Individuals	112,617		135,769		90,259		(17.1	)%	24.8	%
Total Loans	$	3,274,524	$	3,294,356	$	2,682,766	(0.6	)%	22.1	%

Our loan portfolio decreased $19.8 million, or 0.6%, at September 30, 2018 compared to December 31, 2017 in the commercial real estate, loans to individuals,1-4 family residential and municipal loan portfolios, with those decreases partially offset by increases in the commercial loan and construction loan portfolios.

Our loan portfolio increased $591.8 million, or 22.1%, at September 30, 2018 compared to September 30, 2017 due primarily to approximately $621.3 million of loans added on November 30, 2017 in the Diboll acquisition and growth in our Austin and Dallas-Fort Worth markets.

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At September 30, 2018, our real estate loans represented 76.2% of our loan portfolio and are comprised of construction loans of 19.4%, 1-4 family residential loans of 31.7% and commercial real estate loans of 48.9%. Our construction loans are collateralized by property located primarily in or near the market areas we serve. A number of our construction loans will be owner occupied upon completion. Construction loans for non-owner occupied projects typically have cash flows from leases with tenants, secondary sources of repayment, and in some cases, additional collateral. Our 1-4 family residential loans consist primarily of loans secured by first mortgages on owner occupied 1-4 family residences. Commercial real estate loans consist primarily of loans collateralized by retail, commercial office buildings, multi-family residential buildings, medical facilities and offices, senior living, assisted living and skilled nursing facilities, warehouse facilities, hotels and churches.

The banking industry is affected by general economic conditions such as interest rates, inflation, recession, unemployment and other factors beyond our control.  We cannot predict whether current economic conditions will improve, remain the same or decline.  A decline in credit markets generally could adversely affect our financial condition and results of operation if we are unable to extend credit or sell loans into the secondary market. During the last 30 years the Texas economy has continued to diversify, decreasing the overall impact of fluctuations in oil and gas prices; however, the oil and gas industry is still a significant component of the Texas economy. Despite a significant reduction in oil prices during 2015 and 2016 when the price per barrel of crude oil traded below $30 at one point, the Texas economy as a whole has continued to perform very well, reflective of the economic diversity Texas has achieved. Energy loans comprised approximately 1.58% and 1.50% of our loan portfolio at September 30, 2018 and December 31, 2017, respectively.

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Loan Loss Experience and Allowance for Loan Losses

The allowance for loan losses is based on the most current review of the loan portfolio and is a result of multiple processes.  First, we utilize historical net charge-off data to establish general reserve amounts for each class of loans. The historical charge-off figure is further adjusted through qualitative factors that include general trends in past dues, nonaccruals and classified loans to more effectively and promptly react to both positive and negative movements not reflected in historical data. Second, our lenders have the primary responsibility for identifying problem loans based on customer financial stress and underlying collateral.  These recommendations are reviewed by senior loan administration, the special assets department and the loan review department on a monthly basis.  Third, the loan review department independently reviews the portfolio on an annual basis. The loan review department follows a board-approved annual loan review scope.  The loan review scope encompasses a number of considerations including the size of the loan, the type of credit extended, the seasoning of the loan and the performance of the loan.  The loan review scope, as it relates to size, focuses more on larger dollar loan relationships, typically aggregate debt of $500,000 or greater.  The loan review officer also reviews specific reserves compared to general reserves to determine trends in comparative reserves as well as losses not reserved for prior to charge-off to determine the effectiveness of the specific reserve process.

At each review, a subjective analysis methodology is used to grade the respective loan.  Categories of grading vary in severity from loans that do not appear to have a significant probability of loss at the time of review to loans that indicate a probability that the entire balance of the loan will be uncollectible.  If at the time of review we determine it is probable that we will not collect the principal and interest cash flows contractually due on the loan, estimates of future expected cash flows or appraisals of the collateral securing the debt are used to determine the necessary allowances.  The internal loan review department maintains a list (“Watch List”) of all loans or loan relationships that are graded as having more than the normal degree of risk associated with them. In addition, a list of specifically reserved loans or loan relationships of $150,000 or more is updated on a quarterly basis in order to properly determine necessary allowances and keep management informed on the status of attempts to correct the deficiencies noted with respect to the loan.

We calculate historical loss ratios for pools of loans with similar characteristics based on the proportion of actual charge-offs experienced, consistent with the characteristics of remaining loans, to the total population of loans in the pool. The historical gross loss ratios are updated quarterly based on actual charge-off experience and adjusted for qualitative factors. All loans are subject to individual analysis if determined to be impaired with the exception of consumer loans and loans secured by 1-4 family residential loans.

Industry and our own experience indicates that a portion of our loans will become delinquent and a portion of our loans will require partial or full charge-off.  Regardless of the underwriting criteria utilized, losses may occur as a result of various factors beyond our control, including, among other things, changes in market conditions affecting the value of properties used as collateral for loans and problems affecting the credit worthiness of the borrower and the ability of the borrower to make payments on the loan.  Our determination of the appropriateness of the allowance for loan losses is based on various considerations, including an analysis of the risk characteristics of various classifications of loans, previous loan loss experience, specific loans which have loan loss potential, delinquency trends, estimated fair value of the underlying collateral, current economic conditions and geographic and industry loan concentration.

After all of the data in the loan portfolio is accumulated, the reserve allocations are separated into various loan classes.

As of September 30, 2018, our review of the loan portfolio indicated that a loan loss allowance of $26.1 million was appropriate to cover probable losses in the portfolio.  Changes in economic and other conditions may require future adjustments to the allowance for loan losses.

During the nine months ended September 30, 2018, the allowance for loan losses increased $5.3 million, or 25.6%, to $26.1 million, or 0.80% of total loans, when compared to $20.8 million, or 0.63% of total loans at December 31, 2017, and increased $6.2 million, or 31.3%, from $19.9 million, or 0.74% of total loans at September 30, 2017, due primarily to an increase in nonaccruals during the first quarter of 2018 The increase in the allowance for loan losses also included approximately $824,000 on purchased credit impaired loans acquired in connection with the acquisition of Diboll.

For the three and nine months ended September 30, 2018, loan charge-offs were $662,000 and $2.3 million, respectively, and recoveries were $707,000 and $1.7 million, respectively. For the three and nine months ended September 30, 2017, loan charge-offs were $677,000 and $2.8 million, respectively, and recoveries were $347,000 and $1.4 million, respectively. The necessary provision expense was estimated at $1.0 million and $6.0 million for the three and nine months ended September 30, 2018, respectively, an increase of $15,000, or 1.6%, and an increase of $2.6 million, or 76.0%, from $1.0 million and $3.4 million, respectively, for the comparable periods in 2017. The increase in provision expense for the nine months ended September 30, 2018 was primarily due to two large commercial real estate loan relationships placed on nonaccrual status in 2018.

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Nonperforming Assets

Nonperforming assets consist of delinquent loans 90 days or more past due, nonaccrual loans, OREO, repossessed assets and restructured loans.  Nonaccrual loans are loans 90 days or more delinquent and collection in full of both the principal and interest is not expected.  Additionally, some loans that are not delinquent may be placed on nonaccrual status if it is probable that we will not receive contractual principal and interest payments in accordance with the terms of the respective loan agreement. When a loan is categorized as nonaccrual, the accrual of interest is discontinued and any accrued balance is reversed for financial statement purposes. OREO represents real estate taken in full or partial satisfaction of debts previously contracted.  The dollar amount of OREO is based on a current evaluation of the OREO at the time it is recorded on our books, net of estimated selling costs.  Updated valuations are obtained as needed and any additional impairments are recognized.  Restructured loans, or “troubled debt restructured loans”, represent loans renegotiated when both (i) the borrower is experiencing financial difficulties and (ii) the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, restructuring amortization schedules and other actions intended to minimize potential losses. Categorization of a loan as nonperforming is not in itself a reliable indicator of potential loan loss.  Other factors, such as the value of collateral securing the loan and the financial condition of the borrower must be considered in judgments as to potential loan loss.  

The following tables set forth nonperforming assets for the periods presented (in thousands):

	At September 30, 2018		At December 31, 2017		At September 30, 2017
Nonaccrual loans (1)	$	32,526	$	2,937	$	3,095
Accruing loans past due more than 90 days (1)	—		1		—
Restructured loans (2)	5,699		5,767		5,725
Other real estate owned	1,413		1,613		298
Repossessed assets	—		154		1
Total Nonperforming Assets	$	39,638	$	10,472	$	9,119

(1) Excludes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated.

(2) Includes $3.2 million, $2.9 million and $3.0 million in PCI loans restructured as of September 30, 2018, December 31, 2017 and September 30, 2017, respectively.

	At September 30, 2018		At December 31, 2017		At September 30, 2017
Asset Quality Ratios:
Nonaccruing loans to total loans	0.99	%	0.09	%	0.12	%
Allowance for loan losses to nonaccruing loans	80.22		707.56		642.04
Allowance for loan losses to nonperforming assets	65.83		198.44		217.91
Allowance for loan losses to total loans	0.80		0.63		0.74
Nonperforming assets to total assets	0.65		0.16		0.17
Net charge-offs to average loans	0.03		0.07		0.07

Total nonperforming assets at September 30, 2018 were $39.6 million, an increase of $29.2 million, or 278.5%, from $10.5 million at December 31, 2017 and an increase of $30.5 million, or 334.7%, from $9.1 million at September 30, 2017.  

From December 31, 2017 to September 30, 2018, nonaccrual loans increased $29.6 million, or 1,007.5%, to $32.5 million and increased $29.4 million, or 950.9%, from September 30, 2017, primarily due to the addition of two large commercial real estate relationships consisting of three loans during the first quarter of 2018.  Of the total nonaccrual loans at September 30, 2018, $29.5 million are commercial real estate loans, $1.4 million are 1-4 family residential real estate loans, $1.2 million are commercial loans, $407,000 are loans to individuals and $55,000 are construction loans. Restructured loans totaled $5.7 million at September 30, 2018, a decrease of $68,000, or 1.2%, compared to December 31, 2017 and decreased $26,000, or 0.5%, when compared to $5.7 million at September 30, 2017. OREO decreased $200,000, or 12.4%, to $1.4 million at September 30, 2018 from $1.6 million at December 31, 2017 and increased $1.1 million, or 374.2%, from $298,000 at September 30, 2017.  The OREO at September 30, 2018 consisted of construction, 1-4 family residential and commercial real estate properties.  We are actively

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marketing all OREO properties and none are being held for investment purposes. There were no repossessed assets at September 30, 2018, compared to $154,000 at December 31, 2017 and $1,000 at September 30, 2017.

Acquisition

See “Note 2 - Acquisition” in our consolidated financial statements included in this Quarterly Report on Form 10-Q.

Branch Closures

As part of the re-engineering of one of our branches during the rebranding efforts, we made the decision to relocate our Tyler South Broadway branch and drive-thru to one location, which is scheduled to open during the fourth quarter of 2018, at which time our current Tyler South Broadway branch and drive-thru are scheduled to permanently close.

Recent Accounting Pronouncements

See “Note 1 – Summary of Significant Accounting and Reporting Policies” in our consolidated financial statements included in this Quarterly Report on Form 10-Q.

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ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The disclosures set forth in this item are qualified by the section captioned “Forward-Looking Statements” included in “Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations” of this report and other cautionary statements set forth elsewhere in this Quarterly Report on Form 10-Q.

Refer to the discussion of market risks included in “Item 7A.  Quantitative and Qualitative Disclosures About Market Risks” in our Annual Report on Form 10-K for the year ended December 31, 2017.  There have been no significant changes in the types of market risks we face since December 31, 2017.

In the banking industry, a major risk exposure is changing interest rates.  The primary objective of monitoring our interest rate sensitivity, or risk, is to provide management the tools necessary to manage the balance sheet to minimize adverse changes in net interest income as a result of changes in the direction and level of interest rates.  Federal Reserve Board monetary control efforts, the effects of deregulation, the economic uncertainty and legislative changes have been significant factors affecting the task of managing interest rate sensitivity positions in recent years.

In an attempt to manage our exposure to changes in interest rates, management closely monitors our exposure to interest rate risk through our ALCO.  Our ALCO meets regularly and reviews our interest rate risk position and makes recommendations to our board for adjusting this position.  In addition, our board reviews our asset/liability position on a monthly basis.  We primarily use two methods for measuring and analyzing interest rate risk: net income simulation analysis and MVPE modeling.  We utilize the net income simulation model as the primary quantitative tool in measuring the amount of interest rate risk associated with changing market rates.  This model quantifies the effects of various interest rate scenarios on projected net interest income and net income over the next 12 months.  The model is used to measure the impact on net interest income relative to a base case scenario of rates immediately increasing 100 and 200 basis points or decreasing 100 and 200 basis points over the next 12 months.  These simulations incorporate assumptions regarding balance sheet growth and mix, pricing and the repricing and maturity characteristics of the existing and projected balance sheet.  The impact of interest rate-related risks such as prepayment, basis and option risk are also considered.  Due to the low level of interest rates, many of the current interest rates cannot decline 100 or 200 basis points. The model has floors for each of those interest rates, and none are assumed to go negative. As of September 30, 2018, the model simulations projected that immediate increases in interest rates of 100 and 200 basis points would result in positive variances in net interest income of 1.45% and 0.13%, respectively, relative to the base case over the next 12 months, while an immediate decrease in interest rates of 100 and 200 basis points would result in negative variances in net interest income of 1.06% and 6.04%, respectively, relative to the base case over the next 12 months. As of December 31, 2017, the model simulations projected that an immediate increase in interest rates of 100 basis points would result in a positive variance on net interest income of 0.88% and an immediate increase in interest rates of 200 basis points would result in a negative variance on net interest income of 1.13%, relative to the base case over the next 12 months, while an immediate decrease in interest rates of 100 basis points would result in a positive variance in net interest income of 1.25% and an immediate decrease in interest rates of 200 basis points would result in a negative variance on net interest income of 2.50%, relative to the base case over the next 12 months.  As of September 30, 2017, the model simulations projected that 100 and 200 basis point immediate increases in interest rates would result in positive variances on net interest income of 6.94% and 5.66%, respectively, relative to the base case over the next 12 months, while an immediate decrease in interest rates of 100 and 200 basis points would result in negative variances in net interest income of 0.88% and 4.87%, respectively, relative to the base case over the next 12 months. As part of the overall assumptions, certain assets and liabilities are given reasonable floors.  This type of simulation analysis requires numerous assumptions including but not limited to changes in balance sheet mix, prepayment rates on mortgage-related assets and fixed rate loans, cash flows and repricing of all financial instruments, changes in volumes and pricing, future shapes of the yield curve, relationship of market interest rates to each other (basis risk), credit spread and deposit sensitivity.  Assumptions are based on management’s best estimates but may not accurately reflect actual results under certain changes in interest rates.

The ALCO monitors various liquidity ratios to ensure a satisfactory liquidity position for us. Management continually evaluates the condition of the economy, the pattern of market interest rates and other economic data to determine the types of investments that should be made and at what maturities. Using this analysis, management from time to time assumes calculated interest sensitivity gap positions to maximize net interest income based upon anticipated movements in the general level of interest rates. Regulatory authorities also monitor our gap position along with other liquidity ratios. In addition, as described above, we utilize a simulation model to determine the impact of net interest income under several different interest rate scenarios. By utilizing this technology, we can determine changes that need to be made to the asset and liability mixes to mitigate the change in net interest income under these various interest rate scenarios.

72

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Management, including our Chief Executive Officer (“CEO”) and our Chief Financial Officer (“CFO”), undertook an evaluation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this report, and, based on that evaluation, our CEO and CFO concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report, in recording, processing, summarizing and reporting in a timely manner the information that the Company is required to disclose in its reports under the Exchange Act and in accumulating and communicating to the Company’s management, including the Company’s CEO and CFO, such information as appropriate to allow timely decisions regarding required disclosure.  

Changes in Internal Control Over Financial Reporting

No changes were made to our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) during the quarter ended September 30, 2018 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1.    LEGAL PROCEEDINGS

We are a party to various litigation in the normal course of business. Management, after consulting with our legal counsel, believes that any liability resulting from litigation will not have a material effect on our financial position, results of operations or liquidity.

ITEM 1A.    RISK FACTORS

Additional information regarding risk factors appears in “Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations - Forward-Looking Statements” of this Form 10-Q and in Part I - “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2017.  There have been no material changes from the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2017. The risks and uncertainties described in our Annual Report on Form 10-K for the year ended December 31, 2017 are not the only ones we face. Additional risks and uncertainties that management is not aware of or focused on or that management currently deems immaterial may also impair our business operations.

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

None.

ITEM 3.    DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4.    MINE SAFETY DISCLOSURES

None.

ITEM 5.    OTHER INFORMATION

Effective as of October 25, 2018, the Company amended its employment agreement with Julie N. Shamburger, the Company’s Senior Executive Vice President and Chief Financial Officer, to extend the term of Ms. Shamburger’s employment pursuant to the employment agreement.

73

ITEM 6.    EXHIBITS

Exhibit Index

			Incorporated by Reference
Exhibit Number	Exhibit Description	Filed Herewith	Exhibit	Form	Filing Date	File No.
(3)	Articles of Incorporation and Bylaws
3.1	Restated Certificate of Formation of Southside Bancshares, Inc.		3.1	8-K	05/14/2018	0-12247
3.2	Amended and Restated Bylaws of Southside Bancshares, Inc.		3.1	8-K	02/22/2018	0-12247
(10)	Material Contracts
10.1	First Amendment to Employment Agreement between Southside Bancshares, Inc. and Julie Shamburger dated as of October 25, 2018	X
(31)	Rule 13a-14(a)/15d-14(a) Certifications
31.1	Certification of Chief Executive Officer	X
31.2	Certification of Chief Financial Officer	X
(32)	Section 1350 Certification
†32	Certification of Executive Officer and Chief Financial Officer	X
(101)	Interactive Date File
101.INS	XBRL Instance Document.	X
101.SCH	XBRL Taxonomy Extension Schema Document.	X
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.	X
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.	X
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.	X
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.	X
† The certification attached as Exhibit 32 accompanies this Quarterly Report on Form 10-Q and is “furnished” to the Commission pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed “filed” by us for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

74

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.

		SOUTHSIDE BANCSHARES, INC.
DATE:	October 26, 2018	BY:	/s/ Lee R. Gibson
			Lee R. Gibson, CPA
			President and Chief Executive Officer
			(Principal Executive Officer)
DATE:	October 26, 2018	BY:	/s/ Julie N. Shamburger
			Julie N. Shamburger, CPA
			Senior Executive Vice President and Chief Financial Officer
			(Principal Financial and Accounting Officer)

75

EX-10.1

EXHIBIT 10.1

FIRST AMENDMENT TO EMPLOYMENT AGREEMENT

THIS FIRST AMENDMENT TO EMPLOYMENT AGREEMENT (the “Amendment”) is entered into by and between SOUTHSIDE BANK (the “Company”) and JULIE SHAMBURGER (the “Employee”), effective as of the date of execution.

WHEREAS, the Company and the Employee have entered into an employment agreement dated June 4, 2008 (the “Employment Agreement”); and

WHEREAS, the Company and the Employee desire to amend the Employment Agreement to increase the term of Employee’s employment pursuant to the terms and conditions contained in the Employment Agreement;

NOW, THEREFORE, the Company and the Employee agree as follows:

The Employment Agreement is hereby amended by deleting Section 3 in its entirety and replacing it with the following:

3.    Employment Term. Effective as of October 25, 2018 (the “First Amendment Date”), unless earlier terminated in accordance with Section 5 hereof, the Employee’s employment shall be for a three (3) year term (the “Amended Initial Term”), beginning on the First Amendment Date. Beginning on the first anniversary of the First Amendment Date and on each anniversary of the First Amendment Date thereafter, Employee’s employment with Company shall, without further action by the Employee or the Company, be extended by an additional one-year period (with any such extended period being referred to as the “Extended Term”); provided, however, that either party may cause Employee’s employment to cease to extend automatically by giving written notice to the other party not less than ninety (90) days prior to the next annual anniversary of the First Amendment Date. Upon such notice, Employee’s employment shall terminate upon the expiration of the Amended Initial Term or the then-current Extended Term, including any prior extensions. If Company elects to terminate the automatic extension, Section 9 shall no longer be applied following termination of employment. For purposes of this Agreement, the entire period of Employee’s employment shall be referred to as the “Employment Period.”

Except as modified by this Amendment, the Employment Agreement remains in full force and effect. This Amendment and the Employment Agreement, as previously amended, when construed together, constitute the entire agreement of the parties with respect to the matters addressed herein.

(Signature on following page)

EXECUTED on the 25th day of October, 2018.

EMPLOYEE:	SOUTHSIDE BANK
/s/ Julie N. Shamburger	/s/ Lee R. Gibson
Julie N. Shamburger	By: Lee R. Gibson
	Its: President and Chief Executive Officer

EX-31.1

Exhibit 31.1

Certification of Chief Executive Officer

I, Lee R. Gibson, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Southside Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	October 26, 2018	By:	/s/ LEE R. GIBSON
			Lee R. Gibson, CPA
			President and Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification of Chief Financial Officer

I, Julie N. Shamburger, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Southside Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	October 26, 2018	By:	/s/ JULIE N. SHAMBURGER
			Julie N. Shamburger, CPA
			Senior Executive Vice President and Chief Financial Officer

EX-32

Exhibit 32

Certification of Chief Executive and Chief Financial Officer

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 filing of the Quarterly Report on Form 10-Q for the period ended September 30, 2018 (the “Report”) by Southside Bancshares, Inc. (“Registrant”), each of the undersigned hereby certifies that to his or her knowledge:

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 Registrant.

Date:	October 26, 2018	By:	/s/ LEE R. GIBSON
			Lee R. Gibson, CPA
			President and Chief Executive Officer
Date:	October 26, 2018	By:	/s/ JULIE N. SHAMBURGER
			Julie N. Shamburger, CPA
			Senior Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 22, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	SOUTHSIDE BANCSHARES INC
Entity Central Index Key	0000705432
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		35,159,939

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)		Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks		$ 85,103,000	$ 79,171,000
Interest earning deposits		70,685,000	111,541,000
Federal funds sold		18,284,000	7,980,000
Total cash and cash equivalents		174,072,000	198,692,000
Securities available for sale, at estimated fair value		1,939,277,000
Securities available for sale, at estimated fair value			1,538,755,000
Securities held to maturity, at carrying value (estimated fair value of $156,472 and $921,800, respectively)		163,365,000	909,506,000
FHLB stock, at cost		32,291,000	55,729,000
Equity investments		12,029,000
Equity investments			5,821,000
Loans held for sale		954,000	2,001,000
Loans:
Loans		3,274,524,000	3,294,356,000
Less: Allowance for loan losses	[1]	(26,092,000)	(20,781,000)
Net Loans		3,248,432,000	3,273,575,000
Premises and equipment, net		133,939,000	133,640,000
Goodwill		201,116,000	201,246,000
Other intangible assets, net		19,009,000	22,993,000
Interest receivable		22,456,000	28,491,000
Deferred tax asset, net		16,433,000	12,204,000
Unsettled trades to sell securities		14,602,000	0
Unsettled issuances of brokered certificates of deposit		10,000,000	0
Bank owned life insurance		97,611,000	100,368,000
Other assets		19,768,000	15,076,000
Total assets		6,105,354,000	6,498,097,000
Deposits:
Noninterest bearing		1,033,572,000	1,037,401,000
Interest bearing		3,519,940,000	3,478,046,000
Total deposits		4,553,512,000	4,515,447,000
Federal funds purchased and repurchase agreements		8,975,000	9,498,000
FHLB borrowings		561,267,000	1,017,361,000
Subordinated notes, net of unamortized debt issuance costs		98,366,000	98,248,000
Trust preferred subordinated debentures, net of unamortized debt issuance costs		60,244,000	60,241,000
Unsettled trades to purchase securities		28,662,000	0
Other liabilities		41,822,000	43,162,000
Total liabilities		5,352,848,000	5,743,957,000
Off-balance-sheet arrangements, commitments and contingencies (Note 13)
Shareholders’ equity:
Common stock: ($1.25 par value, 80,000,000 shares authorized and 37,832,989 shares issued at September 30, 2018 and 40,000,000 shares authorized and 37,802,352 shares issued at December 31, 2017)		47,291,000	47,253,000
Paid-in capital		761,594,000	757,439,000
Retained earnings		58,578,000	32,851,000
Treasury stock, shares at cost (2,673,050 at September 30, 2018 and 2,802,019 at December 31, 2017)		(45,966,000)	(47,105,000)
Accumulated other comprehensive loss		(68,991,000)	(36,298,000)
Total shareholders’ equity		752,506,000	754,140,000
Total liabilities and shareholders’ equity		$ 6,105,354,000	$ 6,498,097,000

[1] Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss. The allowance for loan loss recorded on purchase credit impaired (“PCI”) loans totaled $824,000 as of September 30, 2018. There was no allowance for loan loss recorded on PCI loans as of December 31, 2017.

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held to maturity, fair value	$ 156,472	$ 921,800
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	80,000,000	40,000,000
Common stock, shares issued (in shares)	37,832,989	37,802,352
Treasury stock (in shares)	2,673,050	2,802,019

XML

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income
Loans	$ 39,831	$ 29,322	$ 117,962	$ 84,666
Investment securities – taxable	36	58	314	702
Investment securities – tax-exempt	6,331	5,670	19,065	18,381
Mortgage-backed securities	10,086	10,567	31,190	31,430
FHLB stock and equity investments	377	329	1,202	926
Other interest earning assets	491	527	1,410	1,265
Total interest income	57,152	46,473	171,143	137,370
Interest expense
Deposits	9,497	5,420	25,529	14,839
FHLB borrowings	3,108	4,156	9,747	11,171
Subordinated notes	1,423	1,413	4,228	4,204
Trust preferred subordinated debentures	684	520	1,911	1,481
Other borrowings	30	4	74	11
Total interest expense	14,742	11,513	41,489	31,706
Net interest income	42,410	34,960	129,654	105,664
Provision for loan losses	975	960	5,991	3,404
Net interest income after provision for loan losses	41,435	34,000	123,663	102,260
Noninterest income
Deposit services	6,317	5,476	18,757	15,845
Net (loss) gain on sale of securities available for sale	(741)	627	(1,900)	874
Gain on sale of loans	303	347	591	1,553
Trust income	1,568	873	5,259	2,662
Bank owned life insurance income	552	636	2,369	1,905
Brokerage services	532	561	1,488	1,790
Other	1,491	888	4,075	3,745
Total noninterest income	10,022	9,408	30,639	28,374
Noninterest expense
Salaries and employee benefits	17,628	14,472	52,820	45,463
Occupancy expense	3,396	2,981	10,339	8,741
Acquisition expense	437	405	2,295	878
Advertising, travel & entertainment	648	487	2,108	1,618
ATM and debit card expense	251	1,024	840	2,840
Professional fees	824	996	2,846	2,985
Software and data processing expense	977	732	2,939	2,145
Telephone and communications	354	459	1,370	1,461
FDIC insurance	435	441	1,416	1,327
Amortization expense on intangibles	1,279	388	3,985	1,229
Other	2,733	2,622	8,945	7,715
Total noninterest expense	28,962	25,007	89,903	76,402
Income before income tax expense	22,495	18,401	64,399	54,232
Income tax expense	2,192	3,890	7,642	10,251
Net income	$ 20,303	$ 14,511	$ 56,757	$ 43,981
Earnings per common share - basic (in dollars per share)	$ 0.58	$ 0.49	$ 1.62	$ 1.50
Earnings per common share - diluted (in dollars per share)	0.58	0.49	1.61	1.49
Dividends paid per common share (in dollars per share)	$ 0.30	$ 0.28	$ 0.88	$ 0.81

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 20,303	$ 14,511	$ 56,757	$ 43,981
Securities available for sale and transferred securities:
Change in net unrealized holding (losses) gains on available for sale securities during the period	(16,885)	344	(65,039)	18,450
Unrealized net gain on securities transferred from held to maturity to available for sale under the transition guidance enumerated in ASU 2017-12	0	0	11,881	0
Change in net unrealized losses on securities transferred from held to maturity to available for sale	0	0	401	0
Reclassification adjustment for net loss on equity investments, reclassified to retained earnings with adoption of ASU 2016-01	0	0	107	0
Reclassification adjustment for amortization related to available for sale and held to maturity debt securities	(661)	490	729	1,191
Reclassification adjustment for net loss (gain) on sale of available for sale securities, included in net income	741	(627)	1,900	(874)
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	1,894	(236)	7,864	(2,084)
Change in net unrealized gains on interest rate swap derivatives terminated during the period	0	0	0	273
Reclassification adjustment from other comprehensive income (loss) related to derivatives designated as cash flow hedge	(406)	101	(864)	694
Pension plans:
Amortization of net actuarial loss and prior service credit, included in net periodic benefit cost	546	402	1,637	1,205
Other comprehensive (loss) income, before tax	(14,771)	474	(41,384)	18,855
Income tax benefit (expense) related to items of other comprehensive income (loss)	3,102	(166)	8,691	(6,599)
Other comprehensive (loss) income, net of tax	(11,669)	308	(32,693)	12,256
Comprehensive income	$ 8,634	$ 14,819	$ 24,064	$ 56,237

XML

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Paid In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance, net of tax at Dec. 31, 2016	$ 518,274	$ 39,320	$ 535,240	$ 30,098	$ (47,891)	$ (38,493)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	43,981			43,981
Other comprehensive income (loss)	12,256					12,256
Issuance of common stock for dividend reinvestment plan (30,637 shares in 2018 and 33,000 shares in 2017)	1,098	41	1,057
Stock compensation expense	1,393		1,393
Net issuance of common stock under employee stock plans (128,969 shares in 2018 and 138,035 shares in 2017)	2,390	61	1,802	(73)	600
Cash dividends paid on common stock ($0.88 per share in 2018 and $0.81 per share in 2017)	(23,369)			(23,369)
Stock dividend declared (719,515 shares in 2017)	0	899	24,061	(24,960)
Ending balance, net of tax at Sep. 30, 2017	556,023	40,321	563,553	25,677	(47,291)	(26,237)
Beginning balance, net of tax at Jun. 30, 2017						(26,545)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,511
Other comprehensive income (loss)	308
Ending balance, net of tax at Sep. 30, 2017	556,023	40,321	563,553	25,677	(47,291)	(26,237)
Beginning balance, net of tax at Dec. 31, 2017	754,140	47,253	757,439	32,851	(47,105)	(36,298)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,757			56,757
Other comprehensive income (loss)	(32,693)					(32,693)
Issuance of common stock for dividend reinvestment plan (30,637 shares in 2018 and 33,000 shares in 2017)	1,089	38	1,051
Stock compensation expense	1,626		1,626
Net issuance of common stock under employee stock plans (128,969 shares in 2018 and 138,035 shares in 2017)	2,530	0	1,478	(87)	1,139
Cash dividends paid on common stock ($0.88 per share in 2018 and $0.81 per share in 2017)	(30,858)			(30,858)
Ending balance, net of tax at Sep. 30, 2018	752,506	47,291	761,594	58,578	(45,966)	(68,991)
Beginning balance, net of tax at Jun. 30, 2018						(57,322)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,303
Other comprehensive income (loss)	(11,669)
Ending balance, net of tax at Sep. 30, 2018	752,506	$ 47,291	$ 761,594	58,578	$ (45,966)	$ (68,991)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of ASU 2016-01	$ (85)			$ (85)

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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Issuance of common stock - DRIP (in shares)	30,637	33,000
Dividends paid on common stock (in dollars per share)	$ 0.88	$ 0.81
Net issuance of common stock under employee stock plans (in shares)	128,969	138,035
Common Stock Dividends, Shares		719,515

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CONSOLIDATED STATEMENTS OF CASH FLOW (UNAUDITED) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES:
Net income	$ 56,757,000	$ 43,981,000
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	10,571,000	7,251,000
Securities premium amortization (discount accretion), net	10,875,000	13,502,000
Loan (discount accretion) premium amortization, net	(2,021,000)	(818,000)
Provision for loan losses	5,991,000	3,404,000
Stock compensation expense	1,626,000	1,393,000
Deferred tax expense	4,535,000	453,000
Net loss (gain) on sale of securities available for sale	1,900,000	(874,000)
Net loss on premises and equipment	379,000	77,000
Gross proceeds from sales of loans held for sale	19,612,000	50,689,000
Gross originations of loans held for sale	(18,565,000)	(45,225,000)
Net loss (gain) on other real estate owned	411,000	(1,000)
Net gain on sale of customer receivables	124,000	0
Net change in:
Interest receivable	6,035,000	6,391,000
Other assets	(1,672,000)	2,696,000
Interest payable	(839,000)	(923,000)
Other liabilities	7,639,000	(4,639,000)
Net cash provided by operating activities	103,110,000	77,357,000
Securities available for sale:
Purchases	(228,281,000)	(371,555,000)
Sales	394,232,000	486,460,000
Maturities, calls and principal repayments	122,135,000	87,096,000
Securities held to maturity:
Purchases	0	(1,521,000)
Maturities, calls and principal repayments	2,656,000	25,455,000
Proceeds from redemption of FHLB stock and other investments	24,360,000	114,000
Purchases of FHLB stock and other investments	(1,174,000)	(761,000)
Net loan paydowns (originations)	15,892,000	(127,240,000)
Proceeds from sales of customer receivables	4,300,000	0
Purchases of premises and equipment	(8,863,000)	(7,090,000)
Proceeds from sales of premises and equipment	1,905,000	8,000
Proceeds from sales of other real estate owned	771,000	134,000
Proceeds from sales of repossessed assets	378,000	341,000
Net cash provided by investing activities	328,311,000	91,441,000
FINANCING ACTIVITIES:
Net change in deposits	27,809,000	31,031,000
Net (decrease) increase in federal funds purchased and repurchase agreements	(523,000)	1,986,000
Proceeds from FHLB borrowings	2,569,000,000	2,366,476,000
Repayment of FHLB borrowings	(3,025,088,000)	(2,533,551,000)
Proceeds from stock option exercises	2,655,000	2,527,000
Cash paid to tax authority related to tax withholding on share-based awards	(125,000)	(137,000)
Proceeds from the issuance of common stock for dividend reinvestment plan	1,089,000	1,098,000
Cash dividends paid	(30,858,000)	(23,369,000)
Net cash used in financing activities	(456,041,000)	(153,939,000)
Net (decrease) increase in cash and cash equivalents	(24,620,000)	14,859,000
Cash and cash equivalents at beginning of period	198,692,000	169,654,000
Cash and cash equivalents at end of period	174,072,000	184,513,000
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	42,209,000	32,629,000
Income taxes paid	2,000,000	8,300,000
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	1,220,000	407,000
Loans transferred from portfolio to held for sale	3,984,000	0
Transfer of held to maturity securities to available for sale securities	743,421,000	0
Adjustment to pension liability	1,637,000	(1,205,000)
Stock dividend (2.5% for 2017)	0	24,960,000
Unsettled trades to purchase securities	(28,662,000)	(16,673,000)
Unsettled trades to sell securities	14,602,000	11,843,000
Unsettled issuances of brokered certificates of deposit	$ 10,000,000	$ 0

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CONSOLIDATED STATEMENTS OF CASH FLOW Consolidated Statements Cash Flow (Parenthetical)	9 Months Ended
	Sep. 30, 2017 Rate
Statement of Cash Flows [Abstract]
Stock dividend declared (as a percent)	2.50%

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Summary of Significant Accounting and Reporting Policies

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Significant Accounting and Reporting Policies

Summary of Significant Accounting and Reporting Policies

Basis of Presentation

In this report, the words “the Company,” “we,” “us,” and “our” refer to the combined entities of Southside Bancshares, Inc. and its subsidiaries.  The words “Southside” and “Southside Bancshares” refer to Southside Bancshares, Inc.  The words “Southside Bank” and “the Bank” refer to Southside Bank. “Omni” refers to OmniAmerican Bancorp, Inc., a bank holding company, and its wholly-owned subsidiary, OmniAmerican Bank, acquired by Southside on December 17, 2014. “Diboll” refers to Diboll State Bancshares, Inc., a bank holding company and its wholly-owned subsidiary, First Bank & Trust East Texas, acquired by Southside on November 30, 2017.

The accompanying unaudited consolidated financial statements have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, not all information required by GAAP for complete financial statements is included in these interim statements. In the opinion of management, all adjustments necessary for a fair presentation of such financial statements have been included.  Such adjustments consisted only of normal recurring items.  The preparation of these consolidated financial statements in accordance with GAAP requires the use of management’s estimates.  These estimates are subjective in nature and involve matters of judgment.  Actual amounts could differ from these estimates.

Interim results are not necessarily indicative of results for a full year.  These financial statements should be read in conjunction with the financial statements and notes thereto in our Annual Report on Form 10-K for the year ended December 31, 2017.  

Accounting Changes and Reclassifications

Certain prior period amounts have been reclassified to conform to current year presentation.

We adopted Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers (Topic 606)” as modified by subsequently issued ASUs 2015-14, 2016-08, 2016-10, 2016-12 and 2016-20, on January 1, 2018, the effective date of the guidance, using the modified retrospective approach. As the majority of the Company’s revenues are not subject to the new guidance, the adoption of ASU 2014-09 did not have a material impact on the Company’s consolidated financial position, results of operations, equity or cash flows. As a result of the guidance, we adjusted the presentation of revenue received from our brokerage services, merchant services, as well as our interchange income associated with debit card services, which were all deemed to be services offered in an agent capacity. These lines of revenue will now be presented on a net basis with the fee income disclosed net of the related costs in the noninterest income section of the consolidated statements of income. In connection with the adoption, for the three and nine months ended September 30, 2018, we netted $1.0 million and $2.8 million of debit card expense against deposit services income and $172,000 and $474,000 of brokerage services expense against brokerage services income, respectively. Due to the implementation of the guidance under the modified retrospective method, prior periods have not been adjusted and are not comparative. Refer to our revenue recognition discussion below and “Note 1 - Summary of Significant Accounting and Reporting Policies” in our Annual Report on Form 10-K for the year ended December 31, 2017 for more information related to our revenue recognition policies.

We adopted ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities,” on January 1, 2018, the effective date of the guidance.  ASU 2016-01, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale (“AFS”) securities in combination with the entity’s other deferred tax assets. The guidance requires companies to apply the requirements in the year of adoption, through cumulative adjustment, while the guidance related to equity securities without readily determinable fair values should be applied prospectively. Adoption of this guidance resulted in a cumulative adjustment to retained earnings of $85,000, net of tax, on January 1, 2018 and an equity security with a carrying value of $5.9 million that was previously recognized in securities AFS, at estimated fair value on our consolidated balance sheet to instead be recognized in equity investments, with subsequent changes in fair value being recognized in income. Also in conjunction with the adoption, our fair value measurement of financial instruments will be based upon an exit price notion as required in ASC 820.  The guidance was applied on a prospective approach resulting in prior periods no longer being comparable.

We adopted ASU 2017-07, “Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” on January 1, 2018. ASU 2017-07 requires employers to present the service cost component of net periodic postretirement benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. Employers are required to present the other components of the net periodic benefit cost separately from the line item that includes the service cost and outside of any subtotal of operating income, if one is presented. The guidance requires companies to apply the requirements retrospectively to all prior periods presented. We elected to use the practical expedient that permits us to use the amounts in our pension plan disclosures in our employee benefit footnote for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements, which resulted in an increase of $77,000 and $234,000 in salaries and employee benefits expense and a decrease of $77,000 and $234,000 in other noninterest expense for the three and nine months ended September 30, 2017, respectively.

We early adopted ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” on January 1, 2018. ASU 2017-12 (i) expands hedge accounting for nonfinancial and financial risk components and amends measurement methodologies to more closely align hedge accounting with a company’s risk management activities, (ii) decreases the complexity of preparing and understanding hedge results by eliminating the separate measurement and reporting of hedge ineffectiveness, (iii) enhances transparency, comparability and understanding of hedge results through enhanced disclosures and changing the presentation of hedge results to align the effects of the hedging instrument and the hedged item and (iv) reduces the cost and complexity of applying hedge accounting by simplifying the manner in which assessments of hedge effectiveness may be performed. The guidance also permits a transition election to reclassify held to maturity (“HTM”) securities to AFS securities if a portion of those securities would qualify to be hedged under the new “last-of-layer” approach. The guidance requires companies to apply the requirements to existing hedging relationships on the date of adoption, and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The guidance did not have an impact on our derivatives that qualified as hedges on the date of adoption and thus no adjustment was made to retained earnings. In conjunction with the adoption of ASU 2017-12, we made the transition election to reclassify approximately $743.4 million in book value of securities from HTM to AFS that qualified for the last-of-layer method described in ASU 2017-12.

During the second quarter of 2018, we entered into partial term fair value hedges, as allowed under the recently adopted ASU 2017-12, for certain of our fixed rate callable AFS municipal securities. These hedges are expected to be effective in offsetting changes in the fair value of the hedged securities. Gains and losses on derivative instruments designated as fair value hedges, as well as the change in fair value on the hedged item, are recorded in interest income in the consolidated statements of income.

Revenue Recognition

Our revenue consists of net interest income on financial assets and financial liabilities and noninterest income.  The classifications of our revenue are presented in the consolidated statements of income. On January 1, 2018, we adopted ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)” using the modified retrospective method. The revenue recognition principle in ASU 2014-09 is that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.

ASU 2014-09 permits an entity to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset would have been one year or less. We generally expense sales commissions when incurred because the amortization period is within one year or less. These costs are recorded within salaries and employee benefits on the consolidated statements of income.

Revenue is recognized when obligations under the terms of a contract with our customer are satisfied; generally this occurs with the transfer of control of goods or services. Under ASU 2014-09’s practical expedient to recognize revenue equal to the amounts for which we have a right to invoice, revenue is measured as the amount of consideration we expect to receive in exchange for the transfer of those goods or services.

The following summarizes our revenue recognition policies as they relate to revenue from contracts with customers under ASU 2014-09:

• Deposit services. Service charges on deposit accounts include fees for banking services provided, overdrafts and non-sufficient funds. Revenue is generally recognized in accordance with published deposit account agreements for retail accounts or contractual agreements for commercial accounts. Our deposit services also include our ATM and debit card interchange revenue that is presented net of the associated costs. Interchange revenue is generated by our deposit customers’ usage and volume of activity. Interchange rates are not controlled by the Company, which effectively acts as processor that collects and remits payments associated with customer debit card transactions.

• Trust income. Trust income includes fees and commissions from investment management, administrative and advisory services primarily for individuals, and to a lesser extent, partnerships and corporations. Revenue is recognized on an accrual basis at the time the services are performed and when we have a right to invoice and are based on either the market value of the assets managed or the services provided.

• Brokerage services. Brokerage services income includes fees and commissions charged when we arrange for another party to transfer brokerage services to a customer. The fees and commissions under this agent relationship are based upon stated fee schedules based upon the type of transaction, volume and value of the services provided.

• Other noninterest income. Other noninterest income includes among other things, merchant services income. Merchant services revenue is derived from third party vendors that process credit card transactions on behalf of our merchant customers. Merchant services revenue is primarily comprised of residual fee income based on the referred merchant’s processing volumes and/or margin.

Securities

Available for Sale (“AFS”).  Debt securities that will be held for indefinite periods of time, including securities that may be sold in response to changes in market interest or prepayment rates, needs for liquidity and changes in the availability of and the yield on alternative investments are classified as AFS.  These assets are carried at fair value with changes recorded in other comprehensive income.  Fair value is determined using quoted market prices as of the close of business on the balance sheet date.  If quoted market prices are not available, fair values are based on quoted market prices for similar securities or estimates from independent pricing services. Securities that are hedged with qualifying derivatives are carried at fair value with the change in fair value on both the hedged instrument and the securities recorded in interest income in the consolidated statements of income.

Held to Maturity (“HTM”). Debt securities that management has the positive intent and ability to hold until maturity are classified as HTM and are carried at their remaining unpaid principal balance, net of unamortized premiums or unaccreted discounts.

Equity Investments. Beginning January 1, 2018, upon adoption of ASU 2016-01, equity investments with readily determinable fair values are stated at fair value with unrealized gains and losses reported in income. For periods prior to January 1, 2018, certain equity investments were classified as AFS and stated at fair value with unrealized gains and losses reported as a separate component of accumulated other comprehensive income (“AOCI”), net of tax. Equity investments without readily determinable fair values are recorded at cost less impairment, if any.

Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 requires a lessee to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP which requires only capital leases to be recognized on the balance sheet, the new ASU 2016-02 will require both finance (formerly known as “capital”) and operating leases to be recognized on the balance sheet. ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The guidance originally required companies to apply the requirements in the year of adoption using a modified retrospective approach; however, in July 2018, the FASB issued ASU 2018-11 “Leases (Topic 842): Targeted Improvements,” which provides lessees the option to apply the new leasing standard by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We plan to select this transition option. We are currently evaluating the impact this guidance will have on our consolidated financial statements, and we anticipate our assessment to be completed during the fiscal year 2018. 

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. ASU 2016-13 also modifies the impairment model for AFS debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. ASU 2016-13 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The guidance requires companies to apply the requirements in the year of adoption through cumulative adjustment with some aspects of the update requiring a prospective transition approach. We are currently evaluating the potential impact of the pending adoption of ASU 2016-13 on our consolidated financial statements. We plan to adopt on January 1, 2020, the effective date. We have developed a project plan and have assigned a project team to complete the analysis needed to implement the guidance. The team is currently completing the data collection and anticipates running parallel models in early 2019.

In January 2017, the FASB issued ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 is intended to simplify goodwill impairment testing by eliminating the second step of the analysis which requires the calculation of the implied fair value of goodwill to measure a goodwill impairment charge. The update requires entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount by which the carrying amount exceeds the reporting unit’s fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective for annual and interim goodwill impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The guidance requires companies to apply the requirements prospectively in the year of adoption. ASU 2017-04 is not expected to have a significant impact on our consolidated financial statements.

In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” Under current GAAP, premiums on callable debt securities are generally amortized over the contractual life of the security. ASU 2017-08 requires the premium on callable debt securities to be amortized to the earliest call date. If the debt security is not called at the earliest call date, the holder of the debt security would be required to reset the effective yield on the debt security based on the payment terms required by the debt security. ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. We have elected to adopt on January 1, 2019. The guidance requires companies to apply the requirements on a modified retrospective basis through a cumulative adjustment directly to retained earnings as of the beginning of the period of adoption. We have evaluated an estimate of the potential impact of the pending adoption of ASU 2017-08 on our consolidated financial statements. Based on our existing municipal securities portfolio, the preliminary estimate of amortizing premiums to the earliest call date will increase amortization expense recorded through interest income for the year ended December 31, 2019 by approximately $2.9 million. Our preliminary estimate of the cumulative adjustment to retained earnings, at the date of adoption, is estimated to reduce retained earnings by $14.4 million, before tax.

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Acquisition

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Business Combination Disclosure

Acquisition

On November 30, 2017, we acquired 100% of the outstanding stock of Diboll State Bancshares, Inc. and its wholly-owned subsidiary First Bank & Trust East Texas (collectively, “Diboll”), headquartered in Diboll, Texas. Diboll operated 17 banking offices in Diboll and surrounding areas. We acquired Diboll to further expand our presence in the East Texas market. The operations of Diboll were merged into the Company as of the date of the acquisition.

The Diboll acquisition was accounted for using the acquisition method of accounting and accordingly, purchased assets, including identifiable intangible assets and assumed liabilities were recorded at their respective acquisition date fair values.  The purchase price allocation is preliminary and is subject to final determination and valuation of the fair value of assets acquired and liabilities assumed. Subsequent to filing our Annual Report on Form 10-K for the year ended December 31, 2017, we continue to evaluate the assets and liabilities assumed. This evaluation has resulted in an immaterial adjustment to goodwill at September 30, 2018, based on the filing of the short-period Federal Income Tax return for Diboll and its subsidiaries. The impact of the adjustments to goodwill, net of deferred tax, is reflected below. For more information concerning the fair value of the assets acquired and liabilities assumed in relation to the acquisition of Diboll, see “Note 2 - Acquisition” in our Annual Report on Form 10-K for the year ended December 31, 2017.

The following table reflects the changes in the carrying amount of goodwill for the three months ended September 30, 2018 (in thousands):

	Goodwill
Balance as of December 31, 2017	$	201,246
Less: measurement period adjustments	(130		)
Balance as of September 30, 2018	$	201,116

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Earnings Per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Earnings per share on a basic and diluted basis are calculated as follows (in thousands, except per share amounts).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Basic and Diluted Earnings:
Net income	$	20,303	$	14,511	$	56,757	$	43,981
Basic weighted-average shares outstanding	35,114		29,370		35,066		29,326
Add:   Stock awards	174		200		175		205
Diluted weighted-average shares outstanding	35,288		29,570		35,241		29,531
Basic Earnings Per Share:
Net Income	$	0.58	$	0.49	$	1.62	$	1.50
Diluted Earnings Per Share:
Net Income	$	0.58	$	0.49	$	1.61	$	1.49

For the three- and nine-month periods ended September 30, 2018, there were approximately 84,000 and 61,000 anti-dilutive shares, respectively. For the three- and nine-month periods ended September 30, 2017, there were approximately 45,000 and 49,000 anti-dilutive shares, respectively.

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Accumulated Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive income (loss) by component are as follows (in thousands):

	Three Months Ended September 30, 2018
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(42,536	)	$	10,753		$	(135	)	$	(25,404	)	$	(57,322	)
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(16,885		)	1,894			—			—			(14,991		)
Reclassified from accumulated other comprehensive income	80			(406		)	(1		)	547			220
Income tax benefit (expense)	3,529			(312		)	—			(115		)	3,102
Net current-period other comprehensive (loss) income, net of tax	(13,276		)	1,176			(1		)	432			(11,669		)
Ending balance, net of tax	$	(55,812	)	$	11,929		$	(136	)	$	(24,972	)	$	(68,991	)
	Nine Months Ended September 30, 2018
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior Service (Cost) Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(16,295	)	$	6,399		$	(133	)	$	(26,269	)	$	(36,298	)
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(52,757		)	7,864			—			—			(44,893		)
Reclassified from accumulated other comprehensive income (1)	2,736			(864		)	(5		)	1,642			3,509
Income tax benefit (expense)	10,504			(1,470		)	2			(345		)	8,691
Net current-period other comprehensive (loss) income, net of tax	(39,517		)	5,530			(3		)	1,297			(32,693		)
Ending balance, net of tax	$	(55,812	)	$	11,929		$	(136	)	$	(24,972	)	$	(68,991	)

(1) As discussed in “Note 1 – Summary of Significant Accounting and Reporting Policies,” the Company adopted ASU 2016-01 on January 1, 2018. This amount includes a reclassification for the cumulative adjustment to retained earnings of $107,000 ($85,000, net of tax).

	Three Months Ended September 30, 2017
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(11,644	)	$	3,957		$	(136	)	$	(18,722	)	$	(26,545	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	344			(236		)	—			—			108
Reclassified from accumulated other comprehensive income	(137		)	101			(1		)	403			366
Income tax (expense) benefit	(72		)	47			—			(141		)	(166		)
Net current-period other comprehensive income (loss), net of tax	135			(88		)	(1		)	262			308
Ending balance, net of tax	$	(11,509	)	$	3,869		$	(137	)	$	(18,460	)	$	(26,237	)
	Nine Months Ended September 30, 2017
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(23,708	)	$	4,595		$	(133	)	$	(19,247	)	$	(38,493	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	18,450			(1,811		)	—			—			16,639
Reclassified from accumulated other comprehensive income	317			694			(5		)	1,210			2,216
Income tax (expense) benefit	(6,568		)	391			1			(423		)	(6,599		)
Net current-period other comprehensive income (loss), net of tax	12,199			(726		)	(4		)	787			12,256
Ending balance, net of tax	$	(11,509	)	$	3,869		$	(137	)	$	(18,460	)	$	(26,237	)

The reclassifications out of accumulated other comprehensive income (loss) into net income are presented below (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Unrealized losses on securities transferred:
Amortization of unrealized losses (1)	$	661		$	(490	)	$	(729	)	$	(1,191	)
Tax (expense) benefit	(139		)	172			153			417
Net of tax	$	522		$	(318	)	$	(576	)	$	(774	)
Unrealized gains and losses on available for sale securities:
Realized net (loss) gain on sale of securities (2)	$	(741	)	$	627		$	(1,900	)	$	874
Tax benefit (expense)	156			(220		)	399			(306		)
Net of tax	$	(585	)	$	407		$	(1,501	)	$	568
Derivatives:
Realized net gain (loss) on interest rate swap derivatives (3)	$	384		$	(122	)	$	799		$	(746	)
Tax (expense) benefit	(81		)	43			(168		)	261
Net of tax	$	303		$	(79	)	$	631		$	(485	)
Amortization of unrealized gains on terminated interest rate swap derivatives (3)	$	22		$	21		$	65		$	52
Tax expense	(5		)	(7		)	(14		)	(18		)
Net of tax	$	17		$	14		$	51		$	34
Amortization of pension plan:
Net actuarial loss (4)	$	(547	)	$	(403	)	$	(1,642	)	$	(1,210	)
Prior service credit (4)	1			1			5			5
Total before tax	(546		)	(402		)	(1,637		)	(1,205		)
Tax benefit	115			141			343			422
Net of tax	(431		)	(261		)	(1,294		)	(783		)
Total reclassifications for the period, net of tax	$	(174	)	$	(237	)	$	(2,689	)	$	(1,440	)

(1)    Included in interest income on the consolidated statements of income.

(2)    Listed as net (loss) gain on sale of securities available for sale on the consolidated statements of income.

(3)    Included in interest expense for FHLB borrowings on the consolidated statements of income.

(4) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 8 - Employee Benefit Plans.”

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Securities

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Securities

Securities

Debt securities

The amortized cost, gross unrealized gains and losses and estimated fair value of investment and mortgage-backed securities available for sale and held to maturity as of September 30, 2018 and December 31, 2017 are reflected in the tables below (in thousands):

	September 30, 2018
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment Securities:
U.S. Treasury	$	19,706	$	42	$	—	$	19,748
State and Political Subdivisions	718,237		4,666		23,834		699,069
Other Stocks and Bonds	3,000		27		—		3,027
Mortgage-backed Securities: (1)
Residential	708,137		1,997		22,536		687,598
Commercial	544,993		244		15,402		529,835
Total	$	1,994,073	$	6,976	$	61,772	$	1,939,277
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	3,087	$	—	$	57	$	3,030
Mortgage-backed Securities: (1)
Residential	59,679		143		3,015		56,807
Commercial	100,599		65		4,029		96,635
Total	$	163,365	$	208	$	7,101	$	156,472

	December 31, 2017
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment Securities:
U.S. Government Agency Debentures	$	108,869	$	—	$	—	$	108,869
State and Political Subdivisions	392,760		3,895		3,991		392,664
Other Stocks and Bonds	5,024		31		—		5,055
Other Equity Securities (2)	6,027		—		107		5,920
Mortgage-backed Securities: (1)
Residential	720,930		4,476		7,377		718,029
Commercial	308,357		761		900		308,218
Total	$	1,541,967	$	9,163	$	12,375	$	1,538,755
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	413,632	$	10,879	$	2,583	$	421,928
Mortgage-backed Securities: (1)
Residential	129,044		1,631		239		130,436
Commercial	366,830		3,812		1,206		369,436
Total	$	909,506	$	16,322	$	4,028	$	921,800

(1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(2) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

From time to time, we have transferred securities from AFS to HTM due to overall balance sheet strategies. The remaining net unamortized, unrealized loss on the transferred securities included in AOCI in the accompanying balance sheets totaled $15.8 million ($12.5 million, net of tax) at September 30, 2018 and $17.4 million ($13.8 million, net of tax) at December 31, 2017. Any net unrealized gain or loss on the transferred securities included in AOCI at the time of transfer will be amortized over the remaining life of the underlying security as an adjustment to the yield on those securities. Securities transferred with losses included in AOCI continue to be included in management’s assessment for other-than-temporary impairment for each individual security. There were no securities transferred from AFS to HTM during the nine months ended September 30, 2018 or the year ended December 31, 2017.

On January 1, 2018, we early-adopted ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” and in conjunction with the adoption took the one-time transition election to reclassify approximately $743.4 million book value of securities from HTM to AFS that qualified for hedging under the last-of-layer approach. The unrealized gain of $11.9 million ($9.4 million, net of tax) on the transferred securities was recognized in other comprehensive income on the date of transfer.

The following tables represent the estimated fair value and unrealized loss on investment and mortgage-backed securities AFS and HTM as of September 30, 2018 and December 31, 2017 (in thousands):

	As of September 30, 2018
	Less Than 12 Months				More Than 12 Months				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
AVAILABLE FOR SALE
Investment Securities:
State and Political Subdivisions	$	287,571	$	7,728	$	244,510	$	16,106	$	532,081	$	23,834
Mortgage-backed Securities:
Residential	332,230		8,003		285,356		14,533		617,586		22,536
Commercial	415,196		12,991		45,485		2,411		460,681		15,402
Total	$	1,034,997	$	28,722	$	575,351	$	33,050	$	1,610,348	$	61,772
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	1,761	$	23	$	1,269	$	34	$	3,030	$	57
Mortgage-backed Securities:
Residential	48,022		2,473		6,781		542		54,803		3,015
Commercial	50,276		1,578		37,995		2,451		88,271		4,029
Total	$	100,059	$	4,074	$	46,045	$	3,027	$	146,104	$	7,101
	As of December 31, 2017
	Less Than 12 Months				More Than 12 Months				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
AVAILABLE FOR SALE
Investment Securities:
State and Political Subdivisions	$	32,341	$	121	$	172,006	$	3,870	$	204,347	$	3,991
Other Equity Securities (1)	5,920		107		—		—		5,920		107
Mortgage-backed Securities:
Residential	429,742		3,232		102,973		4,145		532,715		7,377
Commercial	146,796		419		13,134		481		159,930		900
Total	$	614,799	$	3,879	$	288,113	$	8,496	$	902,912	$	12,375
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	85,608	$	807	$	56,736	$	1,776	$	142,344	$	2,583
Mortgage-backed Securities:
Residential	24,707		157		2,736		82		27,443		239
Commercial	136,491		782		13,552		424		150,043		1,206
Total	$	246,806	$	1,746	$	73,024	$	2,282	$	319,830	$	4,028

(1) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

We review those securities in an unrealized loss position for significant differences between fair value and the cost basis to evaluate if a classification of other-than-temporary impairment is warranted. In estimating other-than-temporary impairment losses, management considers, among other things, the length of time and the extent to which the fair value has been less than cost and the financial condition and near-term prospects of the issuer. We consider an other-than-temporary impairment to have occurred when there is an adverse change in expected cash flows. When it is determined that a decline in fair value of AFS and HTM securities is other-than-temporary, the carrying value of the security is reduced to its estimated fair value, with a corresponding charge to earnings for the credit portion and a charge to other comprehensive income for the noncredit portion. Based upon the length of time and the extent to which fair value is less than cost, we believe that none of the securities with an unrealized loss have other-than-temporary impairment at September 30, 2018.

The majority of the securities in an unrealized loss position are highly rated Texas municipal securities and U.S. Agency mortgage-backed securities (“MBS”) where the unrealized loss is a direct result of the change in interest rates and spreads. For those securities in an unrealized loss position, we do not currently intend to sell the securities and it is not more likely than not that we will be required to sell the securities before the anticipated recovery of their amortized cost basis. To the best of management’s knowledge and based on our consideration of the qualitative factors associated with each security, there were no securities in our investment and MBS portfolio with an other-than-temporary impairment at September 30, 2018.

The following tables reflect interest income recognized on securities for the periods presented (in thousands):

	Three Months Ended September 30,
	2018		2017
U.S. Treasury	$	10	$	—
U.S. Government Agency Debentures	—		—
State and Political Subdivisions	6,331		5,670
Other Stocks and Bonds	26		27
Other Equity Securities	—		31
Mortgage-backed Securities	10,086		10,567
Total interest income on securities	$	16,453	$	16,295

	Nine Months Ended September 30,
	2018		2017
U.S. Treasury	$	141	$	519
U.S. Government Agency Debentures	89		—
State and Political Subdivisions	19,065		18,381
Other Stocks and Bonds	84		96
Other Equity Securities (1)	—		87
Mortgage-backed Securities	31,190		31,430
Total interest income on securities	$	50,569	$	50,513

(1) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

Of the $1.9 million in net securities loss from the AFS portfolio for the nine months ended September 30, 2018, there were $1.9 million in realized gains and $3.8 million in realized losses.  Of the $874,000 in net securities gains from the AFS portfolio for the nine months ended September 30, 2017, there were $4.7 million in realized gains and $3.8 million in realized losses. There were no sales from the HTM portfolio during the nine months ended September 30, 2018 or 2017. We calculate realized gains and losses on sales of securities under the specific identification method.  

The amortized cost and estimated fair value of AFS and HTM securities at September 30, 2018, are presented below by contractual maturity (in thousands).  Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations.  MBS are presented in total by category due to the fact that MBS typically are issued with stated principal amounts, and the securities are backed by pools of mortgages that have loans with varying maturities.  The characteristics of the underlying pool of mortgages, such as fixed-rate or adjustable-rate, as well as prepayment risk, are passed on to the security holder.  The term of a mortgage-backed pass-through security thus approximates the term of the underlying mortgages and can vary significantly due to prepayments.

	September 30, 2018
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment Securities:
Due in one year or less	$	3,557	$	3,616
Due after one year through five years	49,413		50,431
Due after five years through ten years	183,420		181,041
Due after ten years	504,553		486,756
	740,943		721,844
Mortgage-backed Securities	1,253,130		1,217,433
Total	$	1,994,073	$	1,939,277

	September 30, 2018
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment Securities:
Due in one year or less	$	115	$	115
Due after one year through five years	1,700		1,670
Due after five years through ten years	1,272		1,245
Due after ten years	—		—
	3,087		3,030
Mortgage-backed Securities:	160,278		153,442
Total	$	163,365	$	156,472

Investment securities and MBS with carrying values of $1.15 billion and $1.24 billion were pledged as of September 30, 2018 and December 31, 2017, respectively. Pledged securities may be used to collateralize one or more of the following: Federal Home Loan Bank of Dallas (“FHLB”) borrowings, repurchase agreements and public funds or for other purposes as required by law.

Equity Investments

Equity investments on our consolidated balance sheet include Community Reinvestment Act funds with a readily determinable fair value as well as equity investments without readily determinable fair values. At September 30, 2018, we had equity investments recorded in our consolidated balance sheet of $12.0 million. At December 31, 2017, we had $5.8 million in equity investments without readily determinable fair values recorded at cost.

Beginning January 1, 2018, upon adoption of ASU 2016-01, equity investments with readily determinable fair values are stated at fair value with realized and unrealized gains and losses reported in income. For periods prior to January 1, 2018, these equity investments were classified as AFS and stated at fair value with unrealized gains and losses reported as a separate component of AOCI, net of tax. Equity investments without readily determinable fair values are recorded at cost less any impairment, if any.

At December 31, 2017, we had $5.9 million in equity investments included in AFS securities and recorded at fair value, with net unrealized losses of $85,000, net of tax, recognized in AOCI. On January 1, 2018, these unrealized losses were reclassified out of AOCI and into retained earnings with subsequent changes in fair value being recognized in net income. The following is a summary of unrealized and realized gains and losses recognized in net income on equity investments during the three and nine months ended September 30, 2018 (in thousands):

	Three Months Ended			Nine Months Ended
	September 30, 2018			September 30, 2018
Net (losses) recognized during the period on equity investments	$	(42	)	$	(176	)
Less: Net gains and (losses) recognized during the period on equity investments sold during the period	—			—
Unrealized (losses) recognized during the reporting period on equity investments still held at the reporting date	$	(42	)	$	(176	)

Equity investments are assessed quarterly for other-than-temporary impairment. Based upon that evaluation, management does not consider any of our equity investments to be other-than-temporarily impaired at September 30, 2018.

Federal Home Loan Bank Stock

Our FHLB stock, which has limited marketability, is carried at cost.

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Loans and Allowance for Probable Loan Losses

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Loans and Allowance for Probable Loan Losses

Loans and Allowance for Probable Loan Losses

Loans in the accompanying consolidated balance sheets are classified as follows (in thousands):

	September 30, 2018		December 31, 2017
Real Estate Loans:
Construction	$	484,254	$	475,867
1-4 Family Residential	791,274		805,341
Commercial	1,218,714		1,265,159
Commercial Loans	322,873		266,422
Municipal Loans	344,792		345,798
Loans to Individuals	112,617		135,769
Total Loans	3,274,524		3,294,356
Less: Allowance for Loan Losses (1)	26,092		20,781
Net Loans	$	3,248,432	$	3,273,575

(1) Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss. The allowance for loan loss recorded on purchase credit impaired (“PCI”) loans totaled $824,000 as ofSeptember 30, 2018. There was no allowance for loan loss recorded on PCI loans as of December 31, 2017.

Real Estate Construction Loans

Our construction loans are collateralized by property located primarily in or near the market areas we serve. A number of our construction loans will be owner occupied upon completion. Construction loans for non-owner occupied projects are financed, but these typically have cash flows from leases with tenants, secondary sources of repayment, and in some cases, additional collateral. Our construction loans have both adjustable and fixed interest rates during the construction period. Construction loans to individuals are typically priced and made with the intention of granting the permanent loan on the property. Speculative and commercial construction loans are subject to underwriting standards similar to that of the commercial portfolio.  Owner occupied 1-4 family residential construction loans are subject to the underwriting standards of the permanent loan.

Real Estate 1-4 Family Residential Loans

Residential loan originations are generated by our loan officers, in-house origination staff, marketing efforts, present customers, walk-in customers and referrals from real estate agents and builders.  We focus our lending efforts primarily on the origination of loans secured by first mortgages on owner occupied 1-4 family residences.  Substantially all of our 1-4 family residential originations are secured by properties located in or near our market areas.  

Our 1-4 family residential loans generally have maturities ranging from five to 30 years.  These loans are typically fully amortizing with monthly payments sufficient to repay the total amount of the loan.  Our 1-4 family residential loans are made at both fixed and adjustable interest rates.

Underwriting for 1-4 family residential loans includes debt-to-income analysis, credit history analysis, appraised value and down payment considerations. Changes in the market value of real estate can affect the potential losses in the portfolio.

Commercial Real Estate Loans

Commercial real estate loans as of September 30, 2018 consisted of $1.11 billion of owner and non-owner occupied real estate, $87.8 million of loans secured by multi-family properties and $19.4 million of loans secured by farmland. Commercial real estate loans primarily include loans collateralized by retail, commercial office buildings, multi-family residential buildings, medical facilities and offices, senior living, assisted living and skilled nursing facilities, warehouse facilities, hotels and churches. Management does not consider there to be a risk in any one industry type. In determining whether to originate commercial real estate loans, we generally consider such factors as the financial condition of the borrower and the debt service coverage of the property. Commercial real estate loans are made at both fixed and adjustable interest rates for terms generally up to 20 years.

Commercial Loans

Our commercial loans are diversified loan types including short-term working capital loans for inventory and accounts receivable and short- and medium-term loans for equipment or other business capital expansion.  Management does not consider there to be a concentration of risk in any one industry type. In our commercial loan underwriting, we assess the creditworthiness, ability to repay and the value and liquidity of the collateral being offered.  Terms of commercial loans are generally commensurate with the useful life of the collateral offered.

Municipal Loans

We have a specific lending department that makes loans to municipalities and school districts primarily throughout the state of Texas.  Municipal loans outside the state of Texas have been limited to adjoining states. The majority of the loans to municipalities and school districts have tax or revenue pledges and in some cases are additionally supported by collateral.  Municipal loans made without a direct pledge of taxes or revenues are usually made based on some type of collateral that represents an essential service. 

Loans to Individuals

Substantially all originations of our loans to individuals are made to consumers in our market areas.  The majority of loans to individuals are collateralized by titled equipment, which are primarily automobiles. Loan terms vary according to the type and value of collateral, length of contract and creditworthiness of the borrower.  The underwriting standards we employ for consumer loans include an application, a determination of the applicant’s payment history on other debts, with the greatest weight being given to payment history with us and an assessment of the borrower’s ability to meet existing obligations and payments on the proposed loan.  Although creditworthiness of the applicant is a primary consideration, the underwriting process also includes a comparison of the value of the collateral, if any, in relation to the proposed loan amount. Most of our loans to individuals are collateralized, which management believes assists in limiting our exposure.

Allowance for Loan Losses

The allowance for loan losses is based on the most current review of the loan portfolio and is a result of multiple processes.  First, we utilize historical net charge-off data to establish general reserve amounts for each class of loans. The historical charge-off figure is further adjusted through qualitative factors that include general trends in past dues, nonaccruals and classified loans to more effectively and promptly react to both positive and negative movements not reflected in the historical data. Second, our lenders have the primary responsibility for identifying problem loans based on customer financial stress and underlying collateral.  These recommendations are reviewed by senior loan administration, the special assets department and the loan review department on a monthly basis.  Third, the loan review department independently reviews the portfolio on an annual basis.  The loan review department follows a board-approved annual loan review scope.  The loan review scope encompasses a number of considerations including the size of the loan, the type of credit extended, the seasoning of the loan and the performance of the loan.  The loan review scope, as it relates to size, focuses more on larger dollar loan relationships, typically aggregate debt of $500,000 or greater.  The loan review officer also reviews specific reserves compared to general reserves to determine trends in comparative reserves as well as losses not reserved for prior to charge-off to determine the effectiveness of the specific reserve process.

At each review, a subjective analysis methodology is used to grade the respective loan.  Categories of grading vary in severity from loans that do not appear to have a significant probability of loss at the time of review to loans that indicate a probability that the entire balance of the loan will be uncollectible.  If at the time of review we determine it is probable that we will not collect the principal and interest cash flows contractually due on the loan, estimates of future expected cash flows or appraisals of the collateral securing the debt are used to determine the necessary allowances.  The internal loan review department maintains a list (“Watch List”) of all loans or loan relationships that are graded as having more than the normal degree of risk associated with them. In addition, a list of specifically reserved loans or loan relationships of $150,000 or more is updated on a quarterly basis in order to properly determine necessary allowances and keep management informed on the status of attempts to correct the deficiencies noted with respect to the loan.

We calculate historical loss ratios for pools of loans with similar characteristics based on the proportion of actual charge-offs experienced, consistent with the characteristics of remaining loans, to the total population of loans in the pool. The historical gross loss ratios are updated quarterly based on actual charge-off experience and adjusted for qualitative factors. All loans are subject to individual analysis if determined to be impaired with the exception of consumer loans and loans secured by 1-4 family residential loans.

Industry and our own experience indicates that a portion of our loans will become delinquent and a portion of our loans will require partial or full charge-off.  Regardless of the underwriting criteria utilized, losses may occur as a result of various factors beyond our control, including, among other things, changes in market conditions affecting the value of properties used as collateral for loans and problems affecting the credit worthiness of the borrower and the ability of the borrower to make payments on the loan.  Our determination of the appropriateness of the allowance for loan losses is based on various considerations, including an analysis of the risk characteristics of various classifications of loans, previous loan loss experience, specific loans which have loan loss potential, delinquency trends, estimated fair value of the underlying collateral, current economic conditions and geographic and industry loan concentration.

Credit Quality Indicators

We categorize loans into risk categories on an ongoing basis based on relevant information about the ability of borrowers to service their debt such as:  current financial information, historical payment experience, credit documentation, public information and current economic trends, among other factors.  We use the following definitions for risk ratings:

• Pass (Rating 1 – 4) – This rating is assigned to all satisfactory loans.  This category, by definition, consists of acceptable credit.  Credit and collateral exceptions should not be present, although their presence would not necessarily prohibit a loan from being rated Pass, if deficiencies are in the process of correction.  These loans are not included in the Watch List.

• Pass Watch (Rating 5) – These loans require some degree of special treatment, but not due to credit quality.  This category does not include loans specially mentioned or adversely classified; however, particular attention is warranted to characteristics such as:

◦ A lack of, or abnormally extended payment program;

◦ A heavy degree of concentration of collateral without sufficient margin;

◦ A vulnerability to competition through lesser or extensive financial leverage; and

◦ A dependence on a single or few customers or sources of supply and materials without suitable substitutes or alternatives.

• Special Mention (Rating 6) – A Special Mention loan has potential weaknesses that deserve management’s close attention.  If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or in our credit position at some future date.  Special Mention loans are not adversely classified and do not expose us to sufficient risk to warrant adverse classification.

• Substandard (Rating 7) – Substandard loans are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any.  Loans so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt.  They are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected.

• Doubtful (Rating 8) – Loans classified as Doubtful have all the weaknesses inherent in those classified Substandard with the added characteristic that the weaknesses make collection or liquidation, in full, on the basis of currently known facts, conditions and values, highly questionable and improbable.

All accruing loans are reserved for as a group of similar type credits and included in the general portion of the allowance for loan losses. Loans to individuals and 1-4 family residential loans, including loans not accruing, are collectively evaluated and included in the general portion of the allowance for loan losses. All loans considered troubled debt restructurings (“TDR”) are evaluated individually for impairment.

The general portion of the loan loss allowance is reflective of historical charge-off levels for similar loans adjusted for changes in current conditions and other relevant factors.  These factors are likely to cause estimated losses to differ from historical loss experience and include:

• Changes in lending policies or procedures, including underwriting, collection, charge-off and recovery procedures;

• Changes in local, regional and national economic and business conditions, including entry into new markets;

• Changes in the volume or type of credit extended;

• Changes in the experience, ability and depth of lending management;

• Changes in the volume and severity of past due, nonaccrual, restructured, or classified loans;

• Changes in charge-off trends;

• Changes in loan review or Board oversight;

• Changes in the level of concentrations of credit; and

• Changes in external factors, such as competition and legal and regulatory requirements.

These factors are also considered for the non-PCI loan portfolio specifically in regards to changes in credit quality, past due, nonaccrual and charge-off trends.

The following tables detail activity in the allowance for loan losses by portfolio segment for the periods presented (in thousands):

	Three Months Ended September 30, 2018
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	3,841		$	2,730		$	14,036	$	2,560		$	859	$	1,046		$	25,072
Provision (reversal) for loan losses (2)	(717		)	585			290		533			5		279			975
Loans charged off	—			(8		)	—		(13		)	—		(641		)	(662		)
Recoveries of loans charged off	—			331			5		105			—		266			707
Balance at end of period	$	3,124		$	3,638		$	14,331	$	3,185		$	864	$	950		$	26,092

	Nine Months Ended September 30, 2018
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period (1)	$	3,676		$	2,445		$	10,821	$	2,094		$	860	$	885		$	20,781
Provision (reversal) for loan losses (2)	(538		)	906			3,499		1,194			4		926			5,991
Loans charged off	(14		)	(65		)	—		(270		)	—		(1,997		)	(2,346		)
Recoveries of loans charged off	—			352			11		167			—		1,136			1,666
Balance at end of period	$	3,124		$	3,638		$	14,331	$	3,185		$	864	$	950		$	26,092

	Three Months Ended September 30, 2017
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	3,573		$	2,392		$	9,970	$	1,624		$	765	$	917		$	19,241
Provision (reversal) for loan losses (2)	(20		)	34			383		189			41		333			960
Loans charged off	—			(11		)	—		(73		)	—		(593		)	(677		)
Recoveries of loans charged off	—			10			2		89			—		246			347
Balance at end of period	$	3,553		$	2,425		$	10,355	$	1,829		$	806	$	903		$	19,871

	Nine Months Ended September 30, 2017
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	4,147		$	2,665		$	7,204	$	2,263		$	750	$	882		$	17,911
Provision (reversal) for loan losses (2)	(560		)	46			3,140		(84		)	56		806			3,404
Loans charged off	(35		)	(299		)	—		(650		)	—		(1,835		)	(2,819		)
Recoveries of loans charged off	1			13			11		300			—		1,050			1,375
Balance at end of period	$	3,553		$	2,425		$	10,355	$	1,829		$	806	$	903		$	19,871

(1) Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss.

(2) Of the $975,000 and $6.0 million recorded in provision for loan losses for the three and nine months ended September 30, 2018, $466,000 and $824,000 related to provision expense on PCI loans, respectively. Of the $960,000 and $3.4 million recorded in provision for loan losses for the three and nine months ended September 30, 2017, $50,000 related to provision expense on PCI loans.

The following tables present the balance in the allowance for loan losses by portfolio segment based on impairment method (in thousands):

	As of September 30, 2018
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Ending balance – individually evaluated for impairment (1)	$	18	$	37	$	5,563	$	340	$	9	$	72	$	6,039
Ending balance – collectively evaluated for impairment	3,106		3,601		8,768		2,845		855		878		20,053
Balance at end of period	$	3,124	$	3,638	$	14,331	$	3,185	$	864	$	950	$	26,092

	As of December 31, 2017
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Ending balance – individually evaluated for impairment (1)	$	12	$	14	$	14	$	252	$	10	$	51	$	353
Ending balance – collectively evaluated for impairment	3,664		2,431		10,807		1,842		850		834		20,428
Balance at end of period	$	3,676	$	2,445	$	10,821	$	2,094	$	860	$	885	$	20,781

(1) The allowance for loan loss on PCI loans totaled $824,000 as of September 30, 2018. There was no allowance for loan losses associated with PCI loans as of December 31, 2017.

The following tables present the recorded investment in loans by portfolio segment based on impairment method (in thousands):

	September 30, 2018
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Loans individually evaluated for impairment	$	54	$	1,245	$	29,938	$	1,594	$	429	$	168	$	33,428
Loans collectively evaluated for impairment	483,996		778,830		1,167,687		318,726		344,363		111,823		3,205,425
Purchased credit impaired loans	204		11,199		21,089		2,553		—		626		35,671
Total ending loan balance	$	484,254	$	791,274	$	1,218,714	$	322,873	$	344,792	$	112,617	$	3,274,524

	December 31, 2017
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Loans individually evaluated for impairment	$	86	$	1,581	$	895	$	1,429	$	502	$	205	$	4,698
Loans collectively evaluated for impairment	475,505		797,111		1,232,327		259,745		345,296		134,441		3,244,425
Purchased credit impaired loans	276		6,649		31,937		5,248		—		1,123		45,233
Total ending loan balance	$	475,867	$	805,341	$	1,265,159	$	266,422	$	345,798	$	135,769	$	3,294,356

The following tables set forth credit quality indicators by class of loans for the periods presented (in thousands):

	September 30, 2018
	Pass		Pass Watch (1)		Special Mention (1)		Substandard (1)		Doubtful (1)		Total
Real Estate Loans:
Construction	$	483,704	$	382	$	5	$	122	$	41	$	484,254
1-4 Family Residential	782,330		458		553		6,635		1,298		791,274
Commercial	1,086,806		24,346		35,944		69,614		2,004		1,218,714
Commercial Loans	314,422		1,104		4,043		3,030		274		322,873
Municipal Loans	343,504		—		859		429		—		344,792
Loans to Individuals	111,665		15		18		610		309		112,617
Total	$	3,122,431	$	26,305	$	41,422	$	80,440	$	3,926	$	3,274,524

	December 31, 2017
	Pass		Pass Watch (1)		Special Mention (1)		Substandard (1)		Doubtful (1)		Total
Real Estate Loans:
Construction	$	471,446	$	3,329	$	77	$	982	$	33	$	475,867
1-4 Family Residential	796,639		559		857		6,610		676		805,341
Commercial	1,136,576		26,275		25,301		76,625		382		1,265,159
Commercial Loans	247,430		9,625		3,956		5,203		208		266,422
Municipal Loans	344,366		—		930		502		—		345,798
Loans to Individuals	134,694		20		102		707		246		135,769
Total	$	3,131,151	$	39,808	$	31,223	$	90,629	$	1,545	$	3,294,356

(1) Includes PCI loans comprised of $25,000 pass watch, $2.1 million special mention, $6.1 million substandard and $2.4 doubtful as of September 30, 2018. Includes PCI loans comprised of $362,000 pass watch, $6.0 million special mention, $10.5 million substandard and $925,000 doubtful as of December 31, 2017.

Nonperforming Assets and Past Due Loans

Nonaccrual loans are loans 90 days or more delinquent and collection in full of both the principal and interest is not expected.  Additionally, some loans that are not delinquent or that are delinquent less than 90 days may be placed on nonaccrual status if it is probable that we will not receive contractual principal and interest payments in accordance with the terms of the respective loan agreement. When a loan is categorized as nonaccrual, the accrual of interest is discontinued and any accrued balance is reversed for financial statement purposes.  Payments received on nonaccrual loans are applied to the outstanding principal balance. Payments of contractual interest are recognized as income only to the extent that full recovery of the principal balance of the loan is reasonably certain.  Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.  Other factors, such as the value of collateral securing the loan and the financial condition of the borrower, are considered in judgments as to potential loan loss.

Nonaccrual loans and accruing loans past due more than 90 days include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans.

PCI loans are recorded at fair value at acquisition date. Although the PCI loans may be contractually delinquent, we do not classify these loans as past due or nonperforming when the timing and amount of expected cash flows can be reasonably estimated, as the loans were written down to fair value at the acquisition date and the accretable yield is recognized in interest income over the remaining life of the loan. However, subsequent to acquisition, we re-assess PCI loans for additional impairment and record additional impairment in the event we conclude it is probable that we will be unable to collect all cash flows originally expected to be collected at acquisition plus any additional cash flows expected to be collected due to changes in estimates after acquisition. All such PCI loans for which we recognize subsequent impairment are reported as impaired loans in the financial statements.

The following table sets forth nonperforming assets for the periods presented (in thousands):

	At September 30, 2018		At December 31, 2017
Nonaccrual loans (1)	$	32,526	$	2,937
Accruing loans past due more than 90 days (1)	—		1
Restructured loans (2)	5,699		5,767
Other real estate owned	1,413		1,613
Repossessed assets	—		154
Total Nonperforming Assets	$	39,638	$	10,472

(1) Excludes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated. The increase in nonaccrual loans was primarily the result of the addition of two large commercial real estate relationships consisting of three loans in the first quarter of 2018.

(2) Includes $3.2 million and $2.9 million in PCI loans restructured as of September 30, 2018 and December 31, 2017, respectively.

Foreclosed assets include other real estate owned and repossessed assets. For 1-4 family residential real estate properties, a loan is recognized as a foreclosed property once legal title to the real estate property has been received upon completion of foreclosure or the borrower has conveyed all interest in the residential property through a deed in lieu of foreclosure. There were $232,000 and $154,000 in loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of September 30, 2018 and December 31, 2017, respectively.

The following table sets forth the recorded investment in nonaccrual loans by class of loans for the periods presented (in thousands). The table excludes PCI loans measured at fair value at acquisition:

	Nonaccrual Loans
	September 30, 2018		December 31, 2017
Real Estate Loans:
Construction	$	55	$	86
1-4 Family Residential	1,399		1,098
Commercial	29,512		595
Commercial Loans	1,153		903
Loans to Individuals	407		255
Total	$	32,526	$	2,937

Loans are considered impaired if, based on current information and events, it is probable we will be unable to collect the scheduled payments of principal and interest when due according to the contractual terms of the loan agreement.  Impairment is evaluated in total for smaller-balance loans of a similar nature and on an individual loan basis for larger loans. The measurement of loss on impaired loans is generally based on the fair value of the collateral less selling costs if repayment is expected solely from the collateral or the present value of the expected future cash flows discounted at the historical effective interest rate stipulated in the loan agreement. In measuring the fair value of the collateral, in addition to relying on third party appraisals, we use assumptions, such as discount rates, and methodologies, such as comparison to the recent selling price of similar assets, consistent with those that would be utilized by unrelated third parties performing a valuation. Loans that are evaluated and determined not to meet the definition of an impaired loan are reserved for at the general reserve rate for its appropriate class.

At the time a loss is probable in the collection of contractual amounts, specific reserves are allocated.  Loans are charged off to the liquidation value of the collateral net of liquidation costs, if any, when deemed uncollectible or as soon as collection by liquidation is evident.

The following tables set forth impaired loans by class of loans, including the unpaid contractual principal balance, the recorded investment and the allowance for loan losses for the periods presented (in thousands). Impaired loans include restructured and nonaccrual loans for which the allowance was measured in accordance with section 310-10 of ASC Topic 310, “Receivables.” There were no impaired loans recorded without an allowance as of September 30, 2018 or December 31, 2017.

	September 30, 2018
	Unpaid Contractual Principal Balance		Recorded Investment		Related  Allowance for  Loan Losses
Real Estate Loans:
Construction	$	185	$	157	$	18
1-4 Family Residential	4,891		4,559		37
Commercial	33,560		32,267		5,563
Commercial Loans	2,605		2,269		340
Municipal Loans	429		429		9
Loans to Individuals	232		191		72
Total (1)	$	41,902	$	39,872	$	6,039

	December 31, 2017
	Unpaid Contractual Principal Balance		Recorded Investment		Related  Allowance for  Loan Losses
Real Estate Loans:
Construction	$	91	$	86	$	12
1-4 Family Residential	4,141		3,952		14
Commercial	1,353		1,199		14
Commercial Loans	1,665		1,605		252
Municipal Loans	502		502		10
Loans to Individuals	237		205		51
Total (1)	$	7,989	$	7,549	$	353

(1) Includes $6.4 million and $2.9 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date as of September 30, 2018 and December 31, 2017, respectively.

The following tables present the aging of the recorded investment in past due loans by class of loans (in thousands):

	September 30, 2018
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current (1)		Total
Real Estate Loans:
Construction	$	35	$	2,808	$	41	$	2,884	$	481,370	$	484,254
1-4 Family Residential	2,296		2,326		520		5,142		786,132		791,274
Commercial	252		115		123		490		1,218,224		1,218,714
Commercial Loans	1,957		722		420		3,099		319,774		322,873
Municipal Loans	—		—		—		—		344,792		344,792
Loans to Individuals	1,013		229		190		1,432		111,185		112,617
Total	$	5,553	$	6,200	$	1,294	$	13,047	$	3,261,477	$	3,274,524

	December 31, 2017
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current (1)		Total
Real Estate Loans:
Construction	$	1,302	$	1,530	$	68	$	2,900	$	472,967	$	475,867
1-4 Family Residential	8,508		1,574		862		10,944		794,397		805,341
Commercial	1,357		24		5		1,386		1,263,773		1,265,159
Commercial Loans	662		400		333		1,395		265,027		266,422
Municipal Loans	422		—		—		422		345,376		345,798
Loans to Individuals	1,526		373		93		1,992		133,777		135,769
Total	$	13,777	$	3,901	$	1,361	$	19,039	$	3,275,317	$	3,294,356

(1)    Includes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated.

The following table sets forth average recorded investment and interest income recognized on impaired loans by class of loans for the periods presented (in thousands). The table excludes PCI loans measured at fair value at acquisition that have not experienced further deterioration in credit quality subsequent to the acquisition date:

	Three Months Ended
	September 30, 2018				September 30, 2017
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Real Estate Loans:
Construction	$	252	$	3	$	62	$	—
1-4 Family residential	3,976		49		4,170		26
Commercial	32,580		16		1,459		2
Commercial loans	2,543		21		1,148		28
Municipal loans	466		6		537		7
Loans to Individuals	244		1		250		1
Total	$	40,061	$	96	$	7,626	$	64

	Nine Months Ended
	September 30, 2018				September 30, 2017
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Real Estate Loans:
Construction	$	150	$	4	$	301	$	—
1-4 Family Residential	3,951		138		4,322		134
Commercial	24,149		36		1,368		27
Commercial Loans	2,073		51		3,320		118
Municipal Loans	488		20		558		23
Loans to Individuals	223		3		248		4
Total	$	31,034	$	252	$	10,117	$	306

Troubled Debt Restructurings

The restructuring of a loan is considered a TDR if both (i) the borrower is experiencing financial difficulties and (ii) the creditor has granted a concession.  Concessions may include interest rate reductions or below market interest rates, restructuring amortization schedules and other actions intended to minimize potential losses. We may provide a combination of concessions which may include an extension of the amortization period, interest rate reduction and/or converting the loan to interest-only for a limited period of time.

The following tables set forth the recorded balance of loans considered to be TDRs that were restructured and the type of concession during the periods presented (dollars in thousands):

	Three Months Ended September 30, 2018
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real Estate Loans:
Commercial	$	—	$	—	$	283	$	283	2
Commercial Loans	142		—		56		198		4
Loans to Individuals	—		35		—		35		1
Total	$	142	$	35	$	339	$	516	7

	Nine Months Ended September 30, 2018
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real Estate Loans:
1-4 Family Residential	$	—	$	80	$	—	$	80	1
Commercial	—		—		283		283		2
Commercial Loans	244		—		135		379		9
Loans to Individuals	8		35		13		56		4
Total	$	252	$	115	$	431	$	798	16

	Three Months Ended September 30, 2017
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Loans to Individuals	$	—	$	—	$	8	$	8	1
Total	$	—	$	—	$	8	$	8	1

	Nine Months Ended September 30, 2017
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Commercial Loans	$	810	$	—	$	—	$	810	3
Loans to Individuals	27		—		56		83		6
Total	$	837	$	—	$	56	$	893	9

The majority of loans restructured as TDRs during the nine months ended September 30, 2018 and 2017 were modified with maturity extensions or a combination of maturity extensions and interest rate reductions. Interest continues to be charged on principal balances outstanding during the extended term. Therefore, the financial effects of the recorded investment of loans restructured as TDRs during the nine months ended September 30, 2018 and 2017 were not significant. Generally, the loans identified as TDRs were previously reported as impaired loans prior to restructuring and therefore the modification did not impact our determination of the allowance for loan losses.

On an ongoing basis, the performance of the TDRs is monitored for subsequent payment default. Payment default for TDRs is recognized when the borrower is 90 days or more past due. For the three and nine months ended September 30, 2018 and 2017, the amount of TDRs in default was not significant. Payment defaults for TDRs did not significantly impact the determination of the allowance for loan loss in either period presented.

At September 30, 2018 and 2017, there were no commitments to lend additional funds to borrowers whose terms had been modified in TDRs.

Purchased Credit Impaired Loans

The following table presents the outstanding principal balance and carrying value for PCI loans for the periods presented (in thousands):

	September 30, 2018		December 31, 2017
Outstanding principal balance	$	41,094	$	52,426
Carrying amount	$	35,671	$	45,233

The following table presents the changes in the accretable yield during the periods for PCI loans (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	16,105		$	3,758		$	18,721		$	2,480
Changes in expected cash flows not affecting non-accretable differences	—			—			(1,445		)	—
Reclassifications (to) from nonaccretable discount	620			(79		)	1,389			1,735
Accretion	(733		)	(156		)	(2,673		)	(692		)
Balance at end of period	$	15,992		$	3,523		$	15,992		$	3,523

XML

Borrowing Arrangements

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Borrowing Arrangements

Borrowing Arrangements

Information related to borrowings is provided in the table below (dollars in thousands):

	September 30, 2018			December 31, 2017
Federal funds purchased and repurchase agreements:
Balance at end of period	$	8,975		$	9,498
Average amount outstanding during the period (1) (5)	9,018			8,120
Maximum amount outstanding during the period (2)	8,975			9,498
Weighted average interest rate during the period (3) (5)	1.1		%	0.2		%
Interest rate at end of period (4)	0.8		%	0.2		%
FHLB borrowings:
Balance at end of period	$	561,267		$	1,017,361
Average amount outstanding during the period (1) (5)	757,399			1,222,033
Maximum amount outstanding during the period (2)	957,231			1,414,453
Weighted average interest rate during the period (3) (5)	1.7		%	1.2		%
Interest rate at end of period (4)	2.1		%	1.4		%
Subordinated notes, net of unamortized debt issuance costs:
Balance at end of period	$	98,366		$	98,248
Average amount outstanding during the period (1) (5)	98,307			98,172
Maximum amount outstanding during the period (2)	98,366			98,248
Weighted average interest rate during the period (3) (5)	5.8		%	5.7		%
Interest rate at end of period (4)	5.5		%	5.5		%
Trust preferred subordinated debentures, net of unamortized debt issuance costs:
Balance at end of period	$	60,244		$	60,241
Average amount outstanding during the period (1) (5)	60,242			60,238
Maximum amount outstanding during the period (2)	60,244			60,241
Weighted average interest rate during the period (3) (5)	4.2		%	3.3		%
Interest rate at end of period (4)	4.4		%	3.6		%

(1) The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period.

(2) The maximum amount outstanding at any month-end during the period.

(3) The weighted average interest rate during the period was computed by dividing the actual interest expense (annualized for interim periods) by the average amount outstanding during the period. The weighted average interest rate on the FHLB borrowings includes the effect of interest rate swaps.

(4) Stated rate.

(5) Interim period averages are annualized.

Maturities of fixed rate obligations based on scheduled repayments at September 30, 2018 are as follows (in thousands):

	Payments Due by Period
	Less than 1 Year		1-2 Years		2-3 Years		3-4 Years		4-5 Years		Thereafter		Total
Federal funds purchased and repurchase agreements	$	8,588	$	387	$	—	$	—	$	—	$	—	$	8,975
FHLB borrowings	158,505		385,165		11,537		—		—		6,060		561,267
Subordinated notes, net of unamortized debt issuance costs	—		—		—		—		—		98,366		98,366
Trust preferred subordinated debentures, net of unamortized debt issuance costs	—		—		—		—		—		60,244		60,244
Total obligations	$	167,093	$	385,552	$	11,537	$	—	$	—	$	164,670	$	728,852

FHLB borrowings represent borrowings with fixed and floating interest rates ranging from 1.37% to 4.799% and with remaining maturities of one day to 9.8 years.  FHLB borrowings may be collateralized by FHLB stock, nonspecified loans and/or securities.

From time to time, the Company may enter into various variable rate advance agreements with the FHLB. These advance agreements totaled $310.0 million at September 30, 2018 and $280.0 millionDecember 31, 2017. Two of the variable rate advance agreements have interest rates of three-month LIBOR plus 0.021%, and one has an interest rate of three-month LIBOR minus 0.003%. The remaining variable rate advance agreements have interest rates ranging from one-month LIBOR plus 0.072% to one-month LIBOR plus 0.164%. In connection with obtaining these variable rate advance agreements, the Company also entered into various interest rate swap contracts that are treated as cash flow hedges under ASC Topic 815, “Derivatives and Hedging” that effectively converted the variable rate advance agreements to fixed interest rates ranging from 0.932% to 2.8325% and original terms ranging from four years to ten years. The cash flows from the swaps are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the one-month and three-month LIBOR interest rates. During the first quarter of 2017, we terminated two interest rate swap contracts designated as cash flow hedges having a total notional value of $40.0 million. At the time of termination, we determined that the underlying hedged forecasted transactions were still probable of occurring. These transactions are reevaluated on a monthly basis to determine if the hedged forecasted transactions are still probable of occurring. If at a subsequent evaluation it is determined that the transactions will not occur, any related gains or losses recorded in AOCI are immediately recognized in earnings. Refer to “Note 10 - Derivative Financial Instruments and Hedging Activities” in our consolidated financial statements included in this report for a detailed description of our hedging policy and methodology related to derivative instruments.

Southside Bank has three unsecured lines of credit for the purchase of overnight federal funds at prevailing rates with Frost Bank, TIB – The Independent Bankers Bank and Comerica Bank for $40.0 million, $15.0 million and $7.5 million, respectively. There were no federal funds purchased at September 30, 2018 or December 31, 2017.  Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit, and at September 30, 2018, we had one outstanding letter of credit for $195,000. At September 30, 2018, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by FHLB stock, nonspecified loans and securities, was approximately $1.25 billion, net of FHLB stock purchases required.  Southside Bank currently has no outstanding letters of credit from FHLB held as collateral for its public fund deposits.

Southside Bank enters into sales of securities under agreements to repurchase (“repurchase agreements”). These repurchase agreements totaled $9.0 million and $9.5 million at September 30, 2018 and December 31, 2017, respectively, and had maturities of less than two years.  These repurchase agreements are secured by investment securities and are stated at the amount of cash received in connection with the transaction.

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2018

Defined Contribution Plan [Abstract]

Employee Benefit Plans

Employee Benefit Plans

The components of net periodic benefit cost (income) related to our employee benefit plans are as follows (in thousands):

	Three Months Ended September 30,
	Defined Benefit Pension Plan						Defined Benefit Pension Plan Acquired						Restoration Plan
	2018			2017			2018			2017			2018		2017
Service cost	$	387		$	349		$	—		$	—		$	73	$	61
Interest cost	848			901			41			44			149		142
Expected return on assets	(1,621		)	(1,513		)	(73		)	(53		)	—		—
Net loss amortization	378			328			—			—			169		75
Prior service (credit) cost amortization	(3		)	(3		)	—			—			2		2
Net periodic benefit cost (income)	$	(11	)	$	62		$	(32	)	$	(9	)	$	393	$	280

	Nine Months Ended September 30,
	Defined Benefit Pension Plan						Defined Benefit Pension Plan Acquired						Restoration Plan
	2018			2017			2018			2017			2018		2017
Service cost	$	1,161		$	1,048		$	—		$	—		$	220	$	185
Interest cost	2,544			2,701			123			133			447		425
Expected return on assets	(4,863		)	(4,538		)	(218		)	(160		)	—		—
Net loss amortization	1,134			984			—			—			508		226
Prior service (credit) cost amortization	(10		)	(10		)	—			—			5		5
Net periodic benefit cost (income)	$	(34	)	$	185		$	(95	)	$	(27	)	$	1,180	$	841

The service cost component is recorded on our consolidated income statement as salaries and employee benefits in noninterest expense while all other components other than service cost are recorded in other noninterest expense.

In the third quarter of 2018, we made contributions of $2.0 million and $500,000 to the defined benefit pension plan and the defined benefit pension plan acquired, respectively.

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Share-based Incentive Plans

9 Months Ended

Sep. 30, 2018

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

Share-based Incentive Plans

Share-based Incentive Plans

2017 Incentive Plan

On May 10, 2017, our shareholders approved the Southside Bancshares, Inc. 2017 Incentive Plan (the “2017 Incentive Plan”), which is a stock-based incentive compensation plan.  A total of 2,460,000 shares of our common stock were reserved and available for issuance pursuant to awards granted under the 2017 Incentive Plan. This amount includes a number of additional shares (not to exceed 410,000) underlying awards outstanding as of May 10, 2017 under the Company’s 2009 Incentive Plan that thereafter terminate or expire unexercised, or are cancelled, forfeited or lapse for any reason.  Under the 2017 Incentive Plan, we are authorized to grant stock options, stock appreciation rights, restricted stock, restricted stock units, performance awards and qualified performance-based awards or any combination thereof to selected employees, officers, directors and consultants of the Company and its affiliates. As of September 30, 2018, there were 1,687,830 shares remaining available for grant for future awards. 

All share data for all periods presented has been adjusted to give retroactive recognition to stock dividends unless otherwise indicated. Reference to incentive plans refers to the 2017 Incentive Plan and predecessor incentive plans.

There have been 356,849 nonqualified stock options (“NQSOs”) granted during the nine months ended September 30, 2018 with an exercise price equal to the fair value of the shares at the date of grant with a weighted average exercise price of $34.52.  During the nine months ended September 30, 2017, there were no stock option awards granted. The NQSOs have contractual terms of 10 years from the date of grant and vest in equal annual installments over either a three- or four-year period. During the nine months ended September 30, 2018, we granted 52,148 restricted stock units (“RSUs”) with a total value of $1.8 million. During the nine months ended September 30, 2017, there were 3,707 RSUs granted with a total value of $125,000. The RSUs vest in equal annual installments over either a one-, three- or four-year period.

Historically, shares issued in connection with stock compensation awards have been issued from available authorized shares. Beginning in the second quarter of 2017, shares were issued from available treasury shares. Shares issued in connection with stock compensation awards along with other related information are presented in the following table without the retroactive recognition of stock dividends (in thousands, except share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
New shares issued from available authorized shares	—		—		—		48,311
New shares issued from available treasury shares	65,918		77,957		128,969		89,724
Total	65,918		77,957		128,969		138,035
Proceeds from stock option exercises	$	1,571	$	1,505	$	2,655	$	2,527

For the three and nine months ended September 30, 2018, we had share-based compensation expense of $661,000 and $1.6 million, respectively. Share-based compensation expense for the three and nine months ended September 30, 2017 was $480,000 and $1.4 million, respectively.

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Derivative Financial Instruments and Hedging Activities

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments and Hedging Activities

Derivative Financial Instruments and Hedging Activities

Our hedging policy allows the use of interest rate derivative instruments to manage our exposure to interest rate risk or hedge specified assets and liabilities. These instruments may include interest rate swaps and interest rate caps and floors. All derivative instruments are carried on the balance sheet at their estimated fair value and are recorded in other assets or other liabilities, as appropriate.

Derivative instruments may be designated as cash flow hedges of variable rate assets or liabilities, cash flow hedges of forecasted transactions or fair value hedges of a recognized asset or liability. Gains and losses on derivative instruments designated as cash flow hedges are recorded in AOCI to the extent that they are effective. The amount recorded in other comprehensive income is reclassified to earnings in the same periods that the hedged cash flows impact earnings. The ineffective portion of changes in fair value is reported in current earnings. Gains and losses on derivative instruments designated as fair value hedges, as well as the change in fair value on the hedged item, are recorded in interest income in the consolidated statements of income. Gains and losses due to changes in fair value of the interest rate swap agreements completely offset changes in the fair value of the hedged portion of the hedged item. Therefore, no gain or loss has been recognized due to hedge ineffectiveness.

From time to time, we have entered into certain interest rate swap contracts on specific variable rate advance agreements with the FHLB. These interest rate swap contracts were designated as hedging instruments in cash flow hedges under ASC Topic 815. The objective of the interest rate swap contracts is to manage the expected future cash flows on $270.0 million of variable rate advance agreements with the FHLB. The cash flows from the swap are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the underlying LIBOR interest rate.

During the three months ended June 30, 2018, we entered into partial term fair value hedges, as allowed under the recently adopted ASU 2017-12, for certain of our fixed rate callable available for sale municipal securities. These partial term hedges of selected cash flows covering the time periods to the call dates of the hedged securities are expected to be effective in offsetting changes in the fair value of the hedged securities. As of September 30, 2018, hedged securities with a carrying amount of $23.3 million are included in our AFS securities portfolio in our consolidated balance sheets. Interest rate swaps designated as partial-term fair value hedges are utilized to mitigate the effect of changing interest rates on the hedged securities. The hedging strategy converts a portion of the fixed interest rates on the securities to LIBOR-based variable interest rates.

In accordance with ASC Topic 815, if a hedging item is terminated prior to maturity for a cash settlement, the existing gain or loss within AOCI will continue to be reclassified into earnings during the period or periods in which the hedged forecasted transaction affects earnings unless it is probable that the forecasted transaction will not occur by the end of the originally specified time period. If the forecasted transaction is deemed probable to not occur, the derivative gain or loss reported in AOCI shall be reclassified into earnings immediately. During the first quarter of 2017, we terminated two interest rate swap contracts designated as cash flow hedges. At the time of termination, we determined that the underlying hedged forecasted transactions were still probable of occurring. The existing gain in AOCI will be reclassified into earnings in the same periods the hedged forecasted transaction affects earnings.

From time to time, we may enter into certain interest rate swaps, cap and floor contracts that are not designated as hedging instruments. These interest rate derivative contracts relate to transactions in which we enter into an interest rate swap, cap, or floor with a customer while concurrently entering into an offsetting interest rate swap, cap, or floor with a third-party financial institution. We agree to pay interest to the customer on a notional amount at a variable rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, we agree to pay a third-party financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. These interest rate derivative contracts allow our customers to effectively convert a variable rate loan to a fixed rate loan. The changes in the fair value of the underlying derivative contracts primarily offset each other and do not significantly impact our results of operations. For derivative instruments not designated as hedging instruments, the gain or loss is recognized in current earnings during the period of change. We recognized swap fee income associated with these derivative contracts immediately based upon the difference in the bid/ask spread of the underlying transactions with the customer and the third-party financial institution. The swap fee income is included in other noninterest income in our consolidated statements of income.

At September 30, 2018, net derivative assets included $18.0 million of cash collateral received from counterparties under master netting agreements.

The notional amounts of the derivative instruments represent the contractual cash flows pertaining to the underlying agreements. These amounts are not exchanged and are not reflected in the consolidated balance sheets. The fair value of the interest rate swaps are presented at net in other assets and other liabilities when a right of offset exists, based on transactions with a single counterparty that are subject to a legally enforceable master netting agreement.

The following tables present the notional and estimated fair value amount of derivative positions outstanding (in thousands):

	September 30, 2018								December 31, 2017
	Estimated Fair Value								Estimated Fair Value
	Notional Amount (1)		Asset Derivative			Liability Derivative			Notional Amount (1)		Asset Derivative			Liability Derivative
Derivatives designated as hedging instruments
Interest rate contracts:
Swaps-Cash Flow Hedge-Financial institution counterparties	$	270,000	$	14,965		$	—		$	240,000	$	7,922		$	22
Swaps-Fair Value Hedge-Financial institution counterparties	21,100		102			—			—		—			—
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	94,679		3,257			307			67,220		92			612
Swaps-Customer counterparties	94,679		307			3,257			67,220		612			92
Gross derivatives			18,631			3,564					8,626			726
Offsetting derivative assets/liabilities			(307		)	(307		)			(114		)	(114		)
Cash collateral received/posted			(18,017		)	—					(7,900		)	(520		)
Net derivatives included in the consolidated balance sheets (2)			$	307		$	3,257				$	612		$	92

(1) Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

(2) Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and $307,000 related to interest rate swaps with customers at September 30, 2018. We had net credit exposure of $30,000 related to interest rate swaps with financial institutions and $612,000 related to interest rate swaps with customers at December 31, 2017. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.

The summarized expected weighted average remaining maturity of the notional amount of interest rate swaps and the weighted average interest rates associated with the amounts expected to be received or paid on interest rate swap agreements are presented below (dollars in thousands). Variable rates received on pay fixed swaps are based on one-month or three-month LIBOR rates in effect at September 30, 2018 and December 31, 2017:

	September 30, 2018							December 31, 2017
			Weighted Average							Weighted Average
	Notional Amount		Remaining Maturity  (in years)	Receive Rate		Pay Rate		Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate
Swaps-Cash Flow Hedge
Financial institution counterparties	$	270,000	5.1	2.18	%	1.58	%	$	240,000	5.3	1.44	%	1.43	%
Swaps-Fair Value Hedge
Financial institution counterparties	21,100		7.8	2.34		3.00		—		—	—		—
Swaps-Non-Hedging
Financial institution counterparties	94,679		12.1	2.12		2.58		67,220		12.7	1.39		2.37
Customer counterparties	94,679		12.1	2.58		2.12		67,220		12.7	2.37		1.39

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Fair Value Measurement

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement

Fair Value Measurement

Fair value is the price that would be received upon the sale of an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants.  A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability.  The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability is not adjusted for transaction costs.  An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction.  Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.

Valuation techniques including the market approach, the income approach and/or the cost approach are utilized to determine fair value.  Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability.  Valuation policies and procedures are determined by our investment department and reported to our Asset/Liability Committee (“ALCO”) for review.  An entity must consider all aspects of nonperforming risk, including the entity’s own credit standing, when measuring fair value of a liability.  Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances.  A fair value hierarchy for valuation inputs 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.

Level 3 assets recorded at fair value on a nonrecurring basis at September 30, 2018 and December 31, 2017 included loans for which a specific allowance was established based on the fair value of collateral and commercial real estate for which fair value of the properties was less than the cost basis.  For both asset classes, the unobservable inputs were the additional adjustments applied by management to the appraised values to reflect such factors as non-current appraisals and revisions to estimated time to sell.  These adjustments are determined based on qualitative judgments made by management on a case-by-case basis and are not quantifiable inputs, although they are used in the determination of fair value.

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

Certain financial assets are measured at fair value in accordance with GAAP.  Adjustments to the fair value of these assets usually result from the application of fair value accounting or write-downs of individual assets.  Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with our monthly and/or quarterly valuation process.  There were no transfers between Level 1 and Level 2 during the nine months ended September 30, 2018 or the year ended December 31, 2017.

Securities Available for Sale and Equity Investments with readily determinable fair values – U.S. Treasury securities and equity investments are reported at fair value utilizing Level 1 inputs.  Other securities classified as available for sale are reported at fair value utilizing Level 2 inputs.  For these securities, we obtain fair value measurements from independent pricing services and obtain an understanding of the pricing methodologies used by these independent pricing services. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things, as stated in the pricing methodologies of the independent pricing services.

We review and validate the prices supplied by the independent pricing services for reasonableness by comparison to prices obtained from, in most cases, two additional third party sources. For securities where prices are outside a reasonable range, we further review those securities, based on internal ALCO approved procedures, to determine what a reasonable fair value measurement is for those securities, given available data.

Derivatives – Derivatives are reported at fair value utilizing Level 2 inputs. We obtain fair value measurements from three sources including an independent pricing service and the counterparty to the derivatives designated as hedges.  The fair value measurements consider observable data that may include dealer quotes, market spreads, the U.S. Treasury yield curve, live trading levels, trade execution data, credit information and the derivatives’ terms and conditions, among other things. We review the prices supplied by the sources for reasonableness.  In addition, we obtain a basic understanding of their underlying pricing methodology.  We validate prices supplied by the sources by comparison to one another.

Certain nonfinancial assets and nonfinancial liabilities measured at fair value on a recurring basis include reporting units measured at fair value and tested for goodwill impairment. 

Certain financial assets and financial liabilities are measured at fair value on a nonrecurring basis, which means that the instruments 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). Financial assets and financial liabilities measured at fair value on a nonrecurring basis included foreclosed assets and impaired loans at September 30, 2018 and December 31, 2017.

Foreclosed Assets – Foreclosed assets are initially recorded at fair value less costs to sell.  The fair value measurements of foreclosed assets can include Level 2 measurement inputs such as real estate appraisals and comparable real estate sales information, in conjunction with Level 3 measurement inputs such as cash flow projections, qualitative adjustments and sales cost estimates.  As a result, the categorization of foreclosed assets is Level 3 of the fair value hierarchy.  In connection with the measurement and initial recognition of certain foreclosed assets, we may recognize charge-offs through the allowance for loan losses.

Impaired Loans – Certain impaired loans may be reported at the fair value of the underlying collateral if repayment is expected solely from the collateral.  Collateral values are estimated using Level 3 inputs based on customized discounting criteria or appraisals.  At September 30, 2018 and December 31, 2017, the impact of loans with specific reserves based on the fair value of the collateral was reflected in our allowance for loan losses.

The following tables summarize assets measured at fair value on a recurring and nonrecurring basis segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):

	As of September 30, 2018
			Fair Value Measurements at the End of the Reporting Period Using
	Carrying Amount		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring fair value measurements
Investment Securities:
U.S. Treasury	$	19,748	$	19,748	$	—	$	—
State and Political Subdivisions	699,069		—		699,069		—
Other Stocks and Bonds	3,027		—		3,027		—
Mortgage-backed Securities: (1)
Residential	687,598		—		687,598		—
Commercial	529,835		—		529,835		—
Equity Investments:
Equity Investments (2)	5,735		5,735		—		—
Derivative assets:
Interest rate swaps	18,631		—		18,631		—
Total asset recurring fair value measurements	$	1,963,643	$	25,483	$	1,938,160	$	—
Derivative liabilities:
Interest rate swaps	$	3,564	$	—	$	3,564	$	—
Total liability recurring fair value measurements	$	3,564	$	—	$	3,564	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	1,413	$	—	$	—	$	1,413
Impaired loans (3)	33,280		—		—		33,280
Total asset nonrecurring fair value measurements	$	34,693	$	—	$	—	$	34,693

	As of December 31, 2017
			Fair Value Measurements at the End of the Reporting Period Using
	Carrying Amount		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring fair value measurements
Investment Securities:
U.S. Government Agency Debentures	$	108,869	$	—	$	108,869	$	—
State and Political Subdivisions	392,664		—		392,664		—
Other Stocks and Bonds	5,055		—		5,055		—
Equity Investments (2)	5,920		5,920		—		—
Mortgage-backed Securities: (1)
Residential	718,029		—		718,029		—
Commercial	308,218		—		308,218		—
Derivative assets:
Interest rate swaps	8,626		—		8,626		—
Total asset recurring fair value measurements	$	1,547,381	$	5,920	$	1,541,461	$	—
Derivative liabilities:
Interest rate swaps	$	726	$	—	$	726	$	—
Total liability recurring fair value measurements	$	726	$	—	$	726	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	1,767	$	—	$	—	$	1,767
Impaired loans (3)	6,536		—		—		6,536
Total asset nonrecurring fair value measurements	$	8,303	$	—	$	—	$	8,303

(1) All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(2) With the adoption of ASU 2016-01 on January 1, 2018, these investments are included in equity investments on our consolidated balance sheets. The guidance was applied on a prospective approach resulting in prior-periods no longer being comparable. See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

(3) Impaired loans represent collateral-dependent loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.

Disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, is required when it is practicable to estimate that value.  In cases where quoted market prices are not available, fair values are based on estimates using present value or other estimation techniques.  Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows.  Such techniques and assumptions, as they apply to individual categories of our financial instruments, are as follows:

Cash and cash equivalents - The carrying amount for cash and cash equivalents is a reasonable estimate of those assets’ fair value.

Investment and mortgage-backed securities held to maturity - Fair values for these securities are based on quoted market prices, where available.  If quoted market prices are not available, fair values are based on quoted market prices for similar securities or estimates from independent pricing services.

FHLB stock - The carrying amount of FHLB stock is a reasonable estimate of the fair value of those assets.

Equity investments - Equity investments with readily determinable fair values are presented at fair value based upon the currently available bid-and-ask quotations publicly available on a market or exchange. The carrying value of other equity investments without readily determinable fair values are measured at cost less impairment, if any, adjusted for observable price changes for an identical or similar investment of the same issuer. This carrying value is a reasonable estimate of the fair value of those assets.

Loans receivable - With the adoption of ASU 2016-01 on January 1, 2018,we refined our methodology to estimate the fair value of our loan portfolio to an exit price notion with adjustments for liquidity, credit and prepayment factors. The guidance was applied on a prospective approach resulting in prior-periods no longer being comparable. See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information. For December 31, 2017, adjustable rate loans that repriced frequently and with no significant change in credit risk, the carrying amounts were a reasonable estimate of those assets’ fair value and the fair value of fixed rate loans were estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities.  Nonperforming loans continue to be estimated using discounted cash flow analyses or the underlying value of the collateral where applicable.

Loans held for sale – The fair value of loans held for sale is determined based on expected proceeds, which are based on sales contracts and commitments.

Deposit liabilities - The fair value of demand deposits, savings accounts and certain money market deposits is the amount on demand at the reporting date, which is the carrying value.  Fair values for fixed rate CDs are estimated using a discounted cash flow calculation that applies interest rates currently being offered for deposits of similar remaining maturities.

Federal funds purchased and repurchase agreements - Federal funds purchased generally have original terms to maturity of one day and repurchase agreements generally have terms of less than one year, and therefore both are considered short-term borrowings. Consequently, their carrying value is a reasonable estimate of fair value.

FHLB borrowings - The fair value of these borrowings is estimated by discounting the future cash flows using rates at which borrowings would be made to borrowers with similar credit ratings and for the same remaining maturities.

Subordinated notes - The fair value of the subordinated notes is estimated by discounting future cash flows using estimated rates at which long-term debt would be made to borrowers with similar credit ratings and for the remaining maturities.

Long-term debt - The fair value of the long-term debt is estimated by discounting future cash flows using estimated rates at which long-term debt would be made to borrowers with similar credit ratings and for the remaining maturities.

The following tables present our financial assets and financial liabilities measured on a nonrecurring basis at both their respective carrying amounts and estimated fair value (in thousands):

			Estimated Fair Value
September 30, 2018	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial Assets:
Cash and cash equivalents	$	174,072	$	174,072	$	174,072	$	—	$	—
Investment Securities:
Held to maturity, at carrying value	3,087		3,030		—		3,030		—
Mortgage-backed Securities:
Held to maturity, at carrying value	160,278		153,442		—		153,442		—
FHLB stock, at cost	32,291		32,291		—		32,291		—
Equity investments	6,294		6,294		—		6,294		—
Loans, net of allowance for loan losses	3,248,432		3,179,049		—		—		3,179,049
Loans held for sale	954		954		—		954		—
Financial Liabilities:
Deposits	$	4,553,512	$	4,543,794	$	—	$	4,543,794	$	—
Federal funds purchased and repurchase agreements	8,975		8,975		—		8,975		—
FHLB borrowings	561,267		542,846		—		542,846		—
Subordinated notes, net of unamortized debt issuance costs	98,366		97,979		—		97,979		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,244		51,014		—		51,014		—

			Estimated Fair Value
December 31, 2017	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial Assets:
Cash and cash equivalents	$	198,692	$	198,692	$	198,692	$	—	$	—
Investment Securities:
Held to maturity, at carrying value	413,632		421,928		—		421,928		—
Mortgage-backed Securities:
Held to maturity, at carrying value	495,874		499,872		—		499,872		—
FHLB stock, at cost	55,729		55,729		—		55,729		—
Equity investments	5,821		5,821		—		5,821		—
Loans, net of allowance for loan losses	3,273,575		3,269,316		—		—		3,269,316
Loans held for sale	2,001		2,001		—		2,001		—
Financial Liabilities:
Deposits	$	4,515,447	$	4,506,133	$	—	$	4,506,133	$	—
Federal funds purchased and repurchase agreements	9,498		9,498		—		9,498		—
FHLB borrowings	1,017,361		1,008,292		—		1,008,292		—
Subordinated notes, net of unamortized debt issuance costs	98,248		99,665		—		99,665		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,241		47,622		—		47,622		—

The fair value estimate of financial instruments for which quoted market prices are unavailable is dependent upon the assumptions used.  Consequently, those estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instruments.  Accordingly, the aggregate fair value amounts presented in the above fair value tables do not necessarily represent their underlying value.

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Income Taxes

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The income tax expense included in the accompanying statements of income consists of the following (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Current income tax expense	$	95	$	3,454	$	3,107	$	9,798
Deferred income tax expense	2,097		436		4,535		453
Income tax expense	$	2,192	$	3,890	$	7,642	$	10,251

The Tax Cuts and Jobs Act (“Tax Act”) was enacted on December 22, 2017. The Tax Act reduces the U.S. federal corporate tax rate from 35% to 21%. We remeasured certain deferred tax assets and liabilities as of December 22, 2017 based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing certain aspects of the Tax Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. During the three and nine months ended September 30, 2018, we recognized a benefit of approximately $800,000 made to the provisional amounts recorded with the remeasurement of the net deferred tax asset.

The Tax Act repealed the existing Alternative Minimum Tax (“AMT”). As of September 30, 2018, we have a remaining AMT tax credit of $2.2 million. This remaining tax credit carryforward can be used to offset regular future tax liability. Additionally, this AMT credit is refundable in any taxable year after 2017 and before 2022 in an amount equal to 50% of the excess of the minimum tax credit for the taxable year over the amount of the credit allowable for the year against regular tax liability. We expect to realize the remaining AMT tax credit in 2018 to offset tax liability.

Net deferred tax assets totaled $16.4 million at September 30, 2018 and $12.2 million at December 31, 2017.  No valuation allowance for the net deferred tax asset was recorded at September 30, 2018 or December 31, 2017, as management believes it is more likely than not that all of the net deferred tax asset will be realized in future years. Unrecognized tax benefits were not material at September 30, 2018 or December 31, 2017.

We recognized income tax expense of $2.2 million and $7.6 million, for an effective tax rate (“ETR”) of 9.7% and 11.9% for the three and nine months ended September 30, 2018, respectively, compared to income tax expense of $3.9 million and $10.3 million, for an ETR of 21.1% and 18.9%, for the three and nine months ended September 30, 2017, respectively. The lower ETR for the three and nine months ended September 30, 2018 was mainly due to the reduced corporate tax rate under the Tax Act from 35% to 21%. Additionally, the benefit recorded with the remeasurement lowered the ETR by 3.6% and 1.2% for the three and nine months ended September 30, 2018, respectively. The ETR differs from the stated rate of 21% and 35% for the three and nine months ended September 30, 2018 and 2017, respectively, primarily due to the effect of tax-exempt income from municipal loans and securities, as well as bank owned life insurance. We file federal income tax returns in the U.S. federal jurisdictions and in certain states. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2015 or Texas state tax examinations by tax authorities for years before 2014.

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Off-Balance-Sheet Arrangements, Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Off-Balance-Sheet Arrangements, Commitments and Contingencies

Off-Balance-Sheet Arrangements, Commitments and Contingencies

Financial Instruments with Off-Balance-Sheet Risk. In the normal course of business, we are a party to certain financial instruments with off-balance-sheet risk to meet the financing needs of our customers.  These off-balance-sheet instruments include commitments to extend credit and standby letters of credit.  These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount reflected in the financial statements.  The contract or notional amounts of these instruments reflect the extent of involvement and exposure to credit loss that we have in these particular classes of financial instruments.

Commitments to extend credit are agreements to lend to a customer provided that the terms established in the contract are met.  Commitments generally have fixed expiration dates and may require the payment of fees.  Since some commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan commitments to customers and similarly do not necessarily represent future cash obligations.

Financial instruments with off-balance-sheet risk were as follows (in thousands):

	At September 30, 2018		At December 31, 2017
Unused commitments:
Commitments to extend credit	$	819,256	$	804,715
Standby letters of credit	28,197		14,890
Total	$	847,453	$	819,605

We apply the same credit policies in making commitments and standby letters of credit as we do for on-balance-sheet instruments.  We evaluate each customer’s creditworthiness on a case-by-case basis.  The amount of collateral obtained, if deemed necessary, upon extension of credit is based on management’s credit evaluation of the borrower.  Collateral held varies but may include cash or cash equivalents, negotiable instruments, real estate, accounts receivable, inventory, oil, gas and mineral interests, property, plant and equipment.

Lease Commitments. We lease certain branch facilities and office equipment under operating leases.  It is expected that certain leases will be renewed, or equipment replaced with new leased equipment, as these leases expire.

Securities. In the normal course of business we buy and sell securities. At September 30, 2018, there were $28.7 million of unsettled trades to purchase securities and $14.6 million unsettled trades to sell securities. There were no unsettled trades to purchase securities and no unsettled trades to sell securities at December 31, 2017.

Deposits. At September 30, 2018, there were $10.0 million of unsettled issuances of brokered certificates of deposit (“CDs”). There were no unsettled issuances of brokered CDs at December 31, 2017.

Litigation. We are involved with various litigation in the normal course of business.  Management, after consulting with our legal counsel, believes that any liability resulting from litigation will not have a material effect on our financial position, results of operations or liquidity.

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Summary of Significant Accounting and Reporting Policies (Policies)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

In this report, the words “the Company,” “we,” “us,” and “our” refer to the combined entities of Southside Bancshares, Inc. and its subsidiaries.  The words “Southside” and “Southside Bancshares” refer to Southside Bancshares, Inc.  The words “Southside Bank” and “the Bank” refer to Southside Bank. “Omni” refers to OmniAmerican Bancorp, Inc., a bank holding company, and its wholly-owned subsidiary, OmniAmerican Bank, acquired by Southside on December 17, 2014. “Diboll” refers to Diboll State Bancshares, Inc., a bank holding company and its wholly-owned subsidiary, First Bank & Trust East Texas, acquired by Southside on November 30, 2017.

The accompanying unaudited consolidated financial statements have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, not all information required by GAAP for complete financial statements is included in these interim statements. In the opinion of management, all adjustments necessary for a fair presentation of such financial statements have been included.  Such adjustments consisted only of normal recurring items.  The preparation of these consolidated financial statements in accordance with GAAP requires the use of management’s estimates.  These estimates are subjective in nature and involve matters of judgment.  Actual amounts could differ from these estimates.

Interim results are not necessarily indicative of results for a full year.  These financial statements should be read in conjunction with the financial statements and notes thereto in our Annual Report on Form 10-K for the year ended December 31, 2017.  

Accounting Changes and Reclassifications

Certain prior period amounts have been reclassified to conform to current year presentation.

We adopted Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers (Topic 606)” as modified by subsequently issued ASUs 2015-14, 2016-08, 2016-10, 2016-12 and 2016-20, on January 1, 2018, the effective date of the guidance, using the modified retrospective approach. As the majority of the Company’s revenues are not subject to the new guidance, the adoption of ASU 2014-09 did not have a material impact on the Company’s consolidated financial position, results of operations, equity or cash flows. As a result of the guidance, we adjusted the presentation of revenue received from our brokerage services, merchant services, as well as our interchange income associated with debit card services, which were all deemed to be services offered in an agent capacity. These lines of revenue will now be presented on a net basis with the fee income disclosed net of the related costs in the noninterest income section of the consolidated statements of income. In connection with the adoption, for the three and nine months ended September 30, 2018, we netted $1.0 million and $2.8 million of debit card expense against deposit services income and $172,000 and $474,000 of brokerage services expense against brokerage services income, respectively. Due to the implementation of the guidance under the modified retrospective method, prior periods have not been adjusted and are not comparative. Refer to our revenue recognition discussion below and “Note 1 - Summary of Significant Accounting and Reporting Policies” in our Annual Report on Form 10-K for the year ended December 31, 2017 for more information related to our revenue recognition policies.

We adopted ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities,” on January 1, 2018, the effective date of the guidance.  ASU 2016-01, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale (“AFS”) securities in combination with the entity’s other deferred tax assets. The guidance requires companies to apply the requirements in the year of adoption, through cumulative adjustment, while the guidance related to equity securities without readily determinable fair values should be applied prospectively. Adoption of this guidance resulted in a cumulative adjustment to retained earnings of $85,000, net of tax, on January 1, 2018 and an equity security with a carrying value of $5.9 million that was previously recognized in securities AFS, at estimated fair value on our consolidated balance sheet to instead be recognized in equity investments, with subsequent changes in fair value being recognized in income. Also in conjunction with the adoption, our fair value measurement of financial instruments will be based upon an exit price notion as required in ASC 820.  The guidance was applied on a prospective approach resulting in prior periods no longer being comparable.

We adopted ASU 2017-07, “Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” on January 1, 2018. ASU 2017-07 requires employers to present the service cost component of net periodic postretirement benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. Employers are required to present the other components of the net periodic benefit cost separately from the line item that includes the service cost and outside of any subtotal of operating income, if one is presented. The guidance requires companies to apply the requirements retrospectively to all prior periods presented. We elected to use the practical expedient that permits us to use the amounts in our pension plan disclosures in our employee benefit footnote for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements, which resulted in an increase of $77,000 and $234,000 in salaries and employee benefits expense and a decrease of $77,000 and $234,000 in other noninterest expense for the three and nine months ended September 30, 2017, respectively.

We early adopted ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” on January 1, 2018. ASU 2017-12 (i) expands hedge accounting for nonfinancial and financial risk components and amends measurement methodologies to more closely align hedge accounting with a company’s risk management activities, (ii) decreases the complexity of preparing and understanding hedge results by eliminating the separate measurement and reporting of hedge ineffectiveness, (iii) enhances transparency, comparability and understanding of hedge results through enhanced disclosures and changing the presentation of hedge results to align the effects of the hedging instrument and the hedged item and (iv) reduces the cost and complexity of applying hedge accounting by simplifying the manner in which assessments of hedge effectiveness may be performed. The guidance also permits a transition election to reclassify held to maturity (“HTM”) securities to AFS securities if a portion of those securities would qualify to be hedged under the new “last-of-layer” approach. The guidance requires companies to apply the requirements to existing hedging relationships on the date of adoption, and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The guidance did not have an impact on our derivatives that qualified as hedges on the date of adoption and thus no adjustment was made to retained earnings. In conjunction with the adoption of ASU 2017-12, we made the transition election to reclassify approximately $743.4 million in book value of securities from HTM to AFS that qualified for the last-of-layer method described in ASU 2017-12.

During the second quarter of 2018, we entered into partial term fair value hedges, as allowed under the recently adopted ASU 2017-12, for certain of our fixed rate callable AFS municipal securities. These hedges are expected to be effective in offsetting changes in the fair value of the hedged securities. Gains and losses on derivative instruments designated as fair value hedges, as well as the change in fair value on the hedged item, are recorded in interest income in the consolidated statements of income.

Revenue Recognition

Revenue Recognition

Our revenue consists of net interest income on financial assets and financial liabilities and noninterest income.  The classifications of our revenue are presented in the consolidated statements of income. On January 1, 2018, we adopted ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)” using the modified retrospective method. The revenue recognition principle in ASU 2014-09 is that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.

ASU 2014-09 permits an entity to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset would have been one year or less. We generally expense sales commissions when incurred because the amortization period is within one year or less. These costs are recorded within salaries and employee benefits on the consolidated statements of income.

Revenue is recognized when obligations under the terms of a contract with our customer are satisfied; generally this occurs with the transfer of control of goods or services. Under ASU 2014-09’s practical expedient to recognize revenue equal to the amounts for which we have a right to invoice, revenue is measured as the amount of consideration we expect to receive in exchange for the transfer of those goods or services.

The following summarizes our revenue recognition policies as they relate to revenue from contracts with customers under ASU 2014-09:

• Deposit services. Service charges on deposit accounts include fees for banking services provided, overdrafts and non-sufficient funds. Revenue is generally recognized in accordance with published deposit account agreements for retail accounts or contractual agreements for commercial accounts. Our deposit services also include our ATM and debit card interchange revenue that is presented net of the associated costs. Interchange revenue is generated by our deposit customers’ usage and volume of activity. Interchange rates are not controlled by the Company, which effectively acts as processor that collects and remits payments associated with customer debit card transactions.

• Trust income. Trust income includes fees and commissions from investment management, administrative and advisory services primarily for individuals, and to a lesser extent, partnerships and corporations. Revenue is recognized on an accrual basis at the time the services are performed and when we have a right to invoice and are based on either the market value of the assets managed or the services provided.

• Brokerage services. Brokerage services income includes fees and commissions charged when we arrange for another party to transfer brokerage services to a customer. The fees and commissions under this agent relationship are based upon stated fee schedules based upon the type of transaction, volume and value of the services provided.

• Other noninterest income. Other noninterest income includes among other things, merchant services income. Merchant services revenue is derived from third party vendors that process credit card transactions on behalf of our merchant customers. Merchant services revenue is primarily comprised of residual fee income based on the referred merchant’s processing volumes and/or margin.

Securities

Securities

Available for Sale (“AFS”).  Debt securities that will be held for indefinite periods of time, including securities that may be sold in response to changes in market interest or prepayment rates, needs for liquidity and changes in the availability of and the yield on alternative investments are classified as AFS.  These assets are carried at fair value with changes recorded in other comprehensive income.  Fair value is determined using quoted market prices as of the close of business on the balance sheet date.  If quoted market prices are not available, fair values are based on quoted market prices for similar securities or estimates from independent pricing services. Securities that are hedged with qualifying derivatives are carried at fair value with the change in fair value on both the hedged instrument and the securities recorded in interest income in the consolidated statements of income.

Held to Maturity (“HTM”). Debt securities that management has the positive intent and ability to hold until maturity are classified as HTM and are carried at their remaining unpaid principal balance, net of unamortized premiums or unaccreted discounts.

Equity Investments. Beginning January 1, 2018, upon adoption of ASU 2016-01, equity investments with readily determinable fair values are stated at fair value with unrealized gains and losses reported in income. For periods prior to January 1, 2018, certain equity investments were classified as AFS and stated at fair value with unrealized gains and losses reported as a separate component of accumulated other comprehensive income (“AOCI”), net of tax. Equity investments without readily determinable fair values are recorded at cost less impairment, if any.

Accounting Pronouncements

Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 requires a lessee to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP which requires only capital leases to be recognized on the balance sheet, the new ASU 2016-02 will require both finance (formerly known as “capital”) and operating leases to be recognized on the balance sheet. ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The guidance originally required companies to apply the requirements in the year of adoption using a modified retrospective approach; however, in July 2018, the FASB issued ASU 2018-11 “Leases (Topic 842): Targeted Improvements,” which provides lessees the option to apply the new leasing standard by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We plan to select this transition option. We are currently evaluating the impact this guidance will have on our consolidated financial statements, and we anticipate our assessment to be completed during the fiscal year 2018. 

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. ASU 2016-13 also modifies the impairment model for AFS debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. ASU 2016-13 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The guidance requires companies to apply the requirements in the year of adoption through cumulative adjustment with some aspects of the update requiring a prospective transition approach. We are currently evaluating the potential impact of the pending adoption of ASU 2016-13 on our consolidated financial statements. We plan to adopt on January 1, 2020, the effective date. We have developed a project plan and have assigned a project team to complete the analysis needed to implement the guidance. The team is currently completing the data collection and anticipates running parallel models in early 2019.

In January 2017, the FASB issued ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 is intended to simplify goodwill impairment testing by eliminating the second step of the analysis which requires the calculation of the implied fair value of goodwill to measure a goodwill impairment charge. The update requires entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount by which the carrying amount exceeds the reporting unit’s fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective for annual and interim goodwill impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The guidance requires companies to apply the requirements prospectively in the year of adoption. ASU 2017-04 is not expected to have a significant impact on our consolidated financial statements.

In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” Under current GAAP, premiums on callable debt securities are generally amortized over the contractual life of the security. ASU 2017-08 requires the premium on callable debt securities to be amortized to the earliest call date. If the debt security is not called at the earliest call date, the holder of the debt security would be required to reset the effective yield on the debt security based on the payment terms required by the debt security. ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. We have elected to adopt on January 1, 2019. The guidance requires companies to apply the requirements on a modified retrospective basis through a cumulative adjustment directly to retained earnings as of the beginning of the period of adoption. We have evaluated an estimate of the potential impact of the pending adoption of ASU 2017-08 on our consolidated financial statements. Based on our existing municipal securities portfolio, the preliminary estimate of amortizing premiums to the earliest call date will increase amortization expense recorded through interest income for the year ended December 31, 2019 by approximately $2.9 million. Our preliminary estimate of the cumulative adjustment to retained earnings, at the date of adoption, is estimated to reduce retained earnings by $14.4 million, before tax.

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Acquisition (Tables)

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The following table reflects the changes in the carrying amount of goodwill for the three months ended September 30, 2018 (in thousands):

	Goodwill
Balance as of December 31, 2017	$	201,246
Less: measurement period adjustments	(130		)
Balance as of September 30, 2018	$	201,116

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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings per share on a basic and diluted basis

Earnings per share on a basic and diluted basis are calculated as follows (in thousands, except per share amounts).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Basic and Diluted Earnings:
Net income	$	20,303	$	14,511	$	56,757	$	43,981
Basic weighted-average shares outstanding	35,114		29,370		35,066		29,326
Add:   Stock awards	174		200		175		205
Diluted weighted-average shares outstanding	35,288		29,570		35,241		29,531
Basic Earnings Per Share:
Net Income	$	0.58	$	0.49	$	1.62	$	1.50
Diluted Earnings Per Share:
Net Income	$	0.58	$	0.49	$	1.61	$	1.49

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Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of accumulated other comprehensive income (loss) by component

The changes in accumulated other comprehensive income (loss) by component are as follows (in thousands):

	Three Months Ended September 30, 2018
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(42,536	)	$	10,753		$	(135	)	$	(25,404	)	$	(57,322	)
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(16,885		)	1,894			—			—			(14,991		)
Reclassified from accumulated other comprehensive income	80			(406		)	(1		)	547			220
Income tax benefit (expense)	3,529			(312		)	—			(115		)	3,102
Net current-period other comprehensive (loss) income, net of tax	(13,276		)	1,176			(1		)	432			(11,669		)
Ending balance, net of tax	$	(55,812	)	$	11,929		$	(136	)	$	(24,972	)	$	(68,991	)
	Nine Months Ended September 30, 2018
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior Service (Cost) Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(16,295	)	$	6,399		$	(133	)	$	(26,269	)	$	(36,298	)
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(52,757		)	7,864			—			—			(44,893		)
Reclassified from accumulated other comprehensive income (1)	2,736			(864		)	(5		)	1,642			3,509
Income tax benefit (expense)	10,504			(1,470		)	2			(345		)	8,691
Net current-period other comprehensive (loss) income, net of tax	(39,517		)	5,530			(3		)	1,297			(32,693		)
Ending balance, net of tax	$	(55,812	)	$	11,929		$	(136	)	$	(24,972	)	$	(68,991	)

(1) As discussed in “Note 1 – Summary of Significant Accounting and Reporting Policies,” the Company adopted ASU 2016-01 on January 1, 2018. This amount includes a reclassification for the cumulative adjustment to retained earnings of $107,000 ($85,000, net of tax).

	Three Months Ended September 30, 2017
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(11,644	)	$	3,957		$	(136	)	$	(18,722	)	$	(26,545	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	344			(236		)	—			—			108
Reclassified from accumulated other comprehensive income	(137		)	101			(1		)	403			366
Income tax (expense) benefit	(72		)	47			—			(141		)	(166		)
Net current-period other comprehensive income (loss), net of tax	135			(88		)	(1		)	262			308
Ending balance, net of tax	$	(11,509	)	$	3,869		$	(137	)	$	(18,460	)	$	(26,237	)
	Nine Months Ended September 30, 2017
							Pension Plans
	Unrealized Gains (Losses) on Securities			Unrealized Gains (Losses) on Derivatives			Net Prior  Service  (Cost)  Credit			Net Gain (Loss)			Total
Beginning balance, net of tax	$	(23,708	)	$	4,595		$	(133	)	$	(19,247	)	$	(38,493	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	18,450			(1,811		)	—			—			16,639
Reclassified from accumulated other comprehensive income	317			694			(5		)	1,210			2,216
Income tax (expense) benefit	(6,568		)	391			1			(423		)	(6,599		)
Net current-period other comprehensive income (loss), net of tax	12,199			(726		)	(4		)	787			12,256
Ending balance, net of tax	$	(11,509	)	$	3,869		$	(137	)	$	(18,460	)	$	(26,237	)

Reclassifications out of accumulated other comprehensive income

The reclassifications out of accumulated other comprehensive income (loss) into net income are presented below (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Unrealized losses on securities transferred:
Amortization of unrealized losses (1)	$	661		$	(490	)	$	(729	)	$	(1,191	)
Tax (expense) benefit	(139		)	172			153			417
Net of tax	$	522		$	(318	)	$	(576	)	$	(774	)
Unrealized gains and losses on available for sale securities:
Realized net (loss) gain on sale of securities (2)	$	(741	)	$	627		$	(1,900	)	$	874
Tax benefit (expense)	156			(220		)	399			(306		)
Net of tax	$	(585	)	$	407		$	(1,501	)	$	568
Derivatives:
Realized net gain (loss) on interest rate swap derivatives (3)	$	384		$	(122	)	$	799		$	(746	)
Tax (expense) benefit	(81		)	43			(168		)	261
Net of tax	$	303		$	(79	)	$	631		$	(485	)
Amortization of unrealized gains on terminated interest rate swap derivatives (3)	$	22		$	21		$	65		$	52
Tax expense	(5		)	(7		)	(14		)	(18		)
Net of tax	$	17		$	14		$	51		$	34
Amortization of pension plan:
Net actuarial loss (4)	$	(547	)	$	(403	)	$	(1,642	)	$	(1,210	)
Prior service credit (4)	1			1			5			5
Total before tax	(546		)	(402		)	(1,637		)	(1,205		)
Tax benefit	115			141			343			422
Net of tax	(431		)	(261		)	(1,294		)	(783		)
Total reclassifications for the period, net of tax	$	(174	)	$	(237	)	$	(2,689	)	$	(1,440	)

(1)    Included in interest income on the consolidated statements of income.

(2)    Listed as net (loss) gain on sale of securities available for sale on the consolidated statements of income.

(3)    Included in interest expense for FHLB borrowings on the consolidated statements of income.

(4) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 8 - Employee Benefit Plans.”

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Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Amortized cost and estimated fair value of investment and mortgage-backed securities

The amortized cost, gross unrealized gains and losses and estimated fair value of investment and mortgage-backed securities available for sale and held to maturity as of September 30, 2018 and December 31, 2017 are reflected in the tables below (in thousands):

	September 30, 2018
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment Securities:
U.S. Treasury	$	19,706	$	42	$	—	$	19,748
State and Political Subdivisions	718,237		4,666		23,834		699,069
Other Stocks and Bonds	3,000		27		—		3,027
Mortgage-backed Securities: (1)
Residential	708,137		1,997		22,536		687,598
Commercial	544,993		244		15,402		529,835
Total	$	1,994,073	$	6,976	$	61,772	$	1,939,277
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	3,087	$	—	$	57	$	3,030
Mortgage-backed Securities: (1)
Residential	59,679		143		3,015		56,807
Commercial	100,599		65		4,029		96,635
Total	$	163,365	$	208	$	7,101	$	156,472

	December 31, 2017
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment Securities:
U.S. Government Agency Debentures	$	108,869	$	—	$	—	$	108,869
State and Political Subdivisions	392,760		3,895		3,991		392,664
Other Stocks and Bonds	5,024		31		—		5,055
Other Equity Securities (2)	6,027		—		107		5,920
Mortgage-backed Securities: (1)
Residential	720,930		4,476		7,377		718,029
Commercial	308,357		761		900		308,218
Total	$	1,541,967	$	9,163	$	12,375	$	1,538,755
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	413,632	$	10,879	$	2,583	$	421,928
Mortgage-backed Securities: (1)
Residential	129,044		1,631		239		130,436
Commercial	366,830		3,812		1,206		369,436
Total	$	909,506	$	16,322	$	4,028	$	921,800

(1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(2) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

Unrealized loss on securities

The following tables represent the estimated fair value and unrealized loss on investment and mortgage-backed securities AFS and HTM as of September 30, 2018 and December 31, 2017 (in thousands):

	As of September 30, 2018
	Less Than 12 Months				More Than 12 Months				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
AVAILABLE FOR SALE
Investment Securities:
State and Political Subdivisions	$	287,571	$	7,728	$	244,510	$	16,106	$	532,081	$	23,834
Mortgage-backed Securities:
Residential	332,230		8,003		285,356		14,533		617,586		22,536
Commercial	415,196		12,991		45,485		2,411		460,681		15,402
Total	$	1,034,997	$	28,722	$	575,351	$	33,050	$	1,610,348	$	61,772
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	1,761	$	23	$	1,269	$	34	$	3,030	$	57
Mortgage-backed Securities:
Residential	48,022		2,473		6,781		542		54,803		3,015
Commercial	50,276		1,578		37,995		2,451		88,271		4,029
Total	$	100,059	$	4,074	$	46,045	$	3,027	$	146,104	$	7,101
	As of December 31, 2017
	Less Than 12 Months				More Than 12 Months				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
AVAILABLE FOR SALE
Investment Securities:
State and Political Subdivisions	$	32,341	$	121	$	172,006	$	3,870	$	204,347	$	3,991
Other Equity Securities (1)	5,920		107		—		—		5,920		107
Mortgage-backed Securities:
Residential	429,742		3,232		102,973		4,145		532,715		7,377
Commercial	146,796		419		13,134		481		159,930		900
Total	$	614,799	$	3,879	$	288,113	$	8,496	$	902,912	$	12,375
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	85,608	$	807	$	56,736	$	1,776	$	142,344	$	2,583
Mortgage-backed Securities:
Residential	24,707		157		2,736		82		27,443		239
Commercial	136,491		782		13,552		424		150,043		1,206
Total	$	246,806	$	1,746	$	73,024	$	2,282	$	319,830	$	4,028

(1) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

Interest income recognized on securities

The following tables reflect interest income recognized on securities for the periods presented (in thousands):

	Three Months Ended September 30,
	2018		2017
U.S. Treasury	$	10	$	—
U.S. Government Agency Debentures	—		—
State and Political Subdivisions	6,331		5,670
Other Stocks and Bonds	26		27
Other Equity Securities	—		31
Mortgage-backed Securities	10,086		10,567
Total interest income on securities	$	16,453	$	16,295

	Nine Months Ended September 30,
	2018		2017
U.S. Treasury	$	141	$	519
U.S. Government Agency Debentures	89		—
State and Political Subdivisions	19,065		18,381
Other Stocks and Bonds	84		96
Other Equity Securities (1)	—		87
Mortgage-backed Securities	31,190		31,430
Total interest income on securities	$	50,569	$	50,513

(1) See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

Amortized cost, carrying value and fair value of securities presented by contractual maturity

The amortized cost and estimated fair value of AFS and HTM securities at September 30, 2018, are presented below by contractual maturity (in thousands).  Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations.  MBS are presented in total by category due to the fact that MBS typically are issued with stated principal amounts, and the securities are backed by pools of mortgages that have loans with varying maturities.  The characteristics of the underlying pool of mortgages, such as fixed-rate or adjustable-rate, as well as prepayment risk, are passed on to the security holder.  The term of a mortgage-backed pass-through security thus approximates the term of the underlying mortgages and can vary significantly due to prepayments.

	September 30, 2018
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment Securities:
Due in one year or less	$	3,557	$	3,616
Due after one year through five years	49,413		50,431
Due after five years through ten years	183,420		181,041
Due after ten years	504,553		486,756
	740,943		721,844
Mortgage-backed Securities	1,253,130		1,217,433
Total	$	1,994,073	$	1,939,277

	September 30, 2018
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment Securities:
Due in one year or less	$	115	$	115
Due after one year through five years	1,700		1,670
Due after five years through ten years	1,272		1,245
Due after ten years	—		—
	3,087		3,030
Mortgage-backed Securities:	160,278		153,442
Total	$	163,365	$	156,472

Unrealized and realized gains (losses) recognized in net income on equity investments

The following is a summary of unrealized and realized gains and losses recognized in net income on equity investments during the three and nine months ended September 30, 2018 (in thousands):

	Three Months Ended			Nine Months Ended
	September 30, 2018			September 30, 2018
Net (losses) recognized during the period on equity investments	$	(42	)	$	(176	)
Less: Net gains and (losses) recognized during the period on equity investments sold during the period	—			—
Unrealized (losses) recognized during the reporting period on equity investments still held at the reporting date	$	(42	)	$	(176	)

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Loans and Allowance for Probable Loan Losses (Tables)

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Classification of loans in the consolidated balance sheets

Loans in the accompanying consolidated balance sheets are classified as follows (in thousands):

	September 30, 2018		December 31, 2017
Real Estate Loans:
Construction	$	484,254	$	475,867
1-4 Family Residential	791,274		805,341
Commercial	1,218,714		1,265,159
Commercial Loans	322,873		266,422
Municipal Loans	344,792		345,798
Loans to Individuals	112,617		135,769
Total Loans	3,274,524		3,294,356
Less: Allowance for Loan Losses (1)	26,092		20,781
Net Loans	$	3,248,432	$	3,273,575

(1) Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss. The allowance for loan loss recorded on purchase credit impaired (“PCI”) loans totaled $824,000 as ofSeptember 30, 2018. There was no allowance for loan loss recorded on PCI loans as of December 31, 2017.

Activity in the allowance for loan losses by portfolio segment

The following tables detail activity in the allowance for loan losses by portfolio segment for the periods presented (in thousands):

	Three Months Ended September 30, 2018
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	3,841		$	2,730		$	14,036	$	2,560		$	859	$	1,046		$	25,072
Provision (reversal) for loan losses (2)	(717		)	585			290		533			5		279			975
Loans charged off	—			(8		)	—		(13		)	—		(641		)	(662		)
Recoveries of loans charged off	—			331			5		105			—		266			707
Balance at end of period	$	3,124		$	3,638		$	14,331	$	3,185		$	864	$	950		$	26,092

	Nine Months Ended September 30, 2018
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period (1)	$	3,676		$	2,445		$	10,821	$	2,094		$	860	$	885		$	20,781
Provision (reversal) for loan losses (2)	(538		)	906			3,499		1,194			4		926			5,991
Loans charged off	(14		)	(65		)	—		(270		)	—		(1,997		)	(2,346		)
Recoveries of loans charged off	—			352			11		167			—		1,136			1,666
Balance at end of period	$	3,124		$	3,638		$	14,331	$	3,185		$	864	$	950		$	26,092

	Three Months Ended September 30, 2017
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	3,573		$	2,392		$	9,970	$	1,624		$	765	$	917		$	19,241
Provision (reversal) for loan losses (2)	(20		)	34			383		189			41		333			960
Loans charged off	—			(11		)	—		(73		)	—		(593		)	(677		)
Recoveries of loans charged off	—			10			2		89			—		246			347
Balance at end of period	$	3,553		$	2,425		$	10,355	$	1,829		$	806	$	903		$	19,871

	Nine Months Ended September 30, 2017
	Real Estate
	Construction			1-4 Family Residential			Commercial		Commercial Loans			Municipal Loans		Loans to Individuals			Total
Balance at beginning of period	$	4,147		$	2,665		$	7,204	$	2,263		$	750	$	882		$	17,911
Provision (reversal) for loan losses (2)	(560		)	46			3,140		(84		)	56		806			3,404
Loans charged off	(35		)	(299		)	—		(650		)	—		(1,835		)	(2,819		)
Recoveries of loans charged off	1			13			11		300			—		1,050			1,375
Balance at end of period	$	3,553		$	2,425		$	10,355	$	1,829		$	806	$	903		$	19,871

(1) Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss.

(2) Of the $975,000 and $6.0 million recorded in provision for loan losses for the three and nine months ended September 30, 2018, $466,000 and $824,000 related to provision expense on PCI loans, respectively. Of the $960,000 and $3.4 million recorded in provision for loan losses for the three and nine months ended September 30, 2017, $50,000 related to provision expense on PCI loans.

Balance in the allowance for loan losses by portfolio segment based on impairment method

The following tables present the balance in the allowance for loan losses by portfolio segment based on impairment method (in thousands):

	As of September 30, 2018
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Ending balance – individually evaluated for impairment (1)	$	18	$	37	$	5,563	$	340	$	9	$	72	$	6,039
Ending balance – collectively evaluated for impairment	3,106		3,601		8,768		2,845		855		878		20,053
Balance at end of period	$	3,124	$	3,638	$	14,331	$	3,185	$	864	$	950	$	26,092

	As of December 31, 2017
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Ending balance – individually evaluated for impairment (1)	$	12	$	14	$	14	$	252	$	10	$	51	$	353
Ending balance – collectively evaluated for impairment	3,664		2,431		10,807		1,842		850		834		20,428
Balance at end of period	$	3,676	$	2,445	$	10,821	$	2,094	$	860	$	885	$	20,781

(1) The allowance for loan loss on PCI loans totaled $824,000 as of September 30, 2018. There was no allowance for loan losses associated with PCI loans as of December 31, 2017.

Balance in recorded investments in loans by portfolio segment based on impairment method

The following tables present the recorded investment in loans by portfolio segment based on impairment method (in thousands):

	September 30, 2018
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Loans individually evaluated for impairment	$	54	$	1,245	$	29,938	$	1,594	$	429	$	168	$	33,428
Loans collectively evaluated for impairment	483,996		778,830		1,167,687		318,726		344,363		111,823		3,205,425
Purchased credit impaired loans	204		11,199		21,089		2,553		—		626		35,671
Total ending loan balance	$	484,254	$	791,274	$	1,218,714	$	322,873	$	344,792	$	112,617	$	3,274,524

	December 31, 2017
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Loans individually evaluated for impairment	$	86	$	1,581	$	895	$	1,429	$	502	$	205	$	4,698
Loans collectively evaluated for impairment	475,505		797,111		1,232,327		259,745		345,296		134,441		3,244,425
Purchased credit impaired loans	276		6,649		31,937		5,248		—		1,123		45,233
Total ending loan balance	$	475,867	$	805,341	$	1,265,159	$	266,422	$	345,798	$	135,769	$	3,294,356

Summary of loans by credit quality indicators

The following tables set forth credit quality indicators by class of loans for the periods presented (in thousands):

	September 30, 2018
	Pass		Pass Watch (1)		Special Mention (1)		Substandard (1)		Doubtful (1)		Total
Real Estate Loans:
Construction	$	483,704	$	382	$	5	$	122	$	41	$	484,254
1-4 Family Residential	782,330		458		553		6,635		1,298		791,274
Commercial	1,086,806		24,346		35,944		69,614		2,004		1,218,714
Commercial Loans	314,422		1,104		4,043		3,030		274		322,873
Municipal Loans	343,504		—		859		429		—		344,792
Loans to Individuals	111,665		15		18		610		309		112,617
Total	$	3,122,431	$	26,305	$	41,422	$	80,440	$	3,926	$	3,274,524

	December 31, 2017
	Pass		Pass Watch (1)		Special Mention (1)		Substandard (1)		Doubtful (1)		Total
Real Estate Loans:
Construction	$	471,446	$	3,329	$	77	$	982	$	33	$	475,867
1-4 Family Residential	796,639		559		857		6,610		676		805,341
Commercial	1,136,576		26,275		25,301		76,625		382		1,265,159
Commercial Loans	247,430		9,625		3,956		5,203		208		266,422
Municipal Loans	344,366		—		930		502		—		345,798
Loans to Individuals	134,694		20		102		707		246		135,769
Total	$	3,131,151	$	39,808	$	31,223	$	90,629	$	1,545	$	3,294,356

(1) Includes PCI loans comprised of $25,000 pass watch, $2.1 million special mention, $6.1 million substandard and $2.4 doubtful as of September 30, 2018. Includes PCI loans comprised of $362,000 pass watch, $6.0 million special mention, $10.5 million substandard and $925,000 doubtful as of December 31, 2017.

Summary of nonperforming assets for the period

The following table sets forth nonperforming assets for the periods presented (in thousands):

	At September 30, 2018		At December 31, 2017
Nonaccrual loans (1)	$	32,526	$	2,937
Accruing loans past due more than 90 days (1)	—		1
Restructured loans (2)	5,699		5,767
Other real estate owned	1,413		1,613
Repossessed assets	—		154
Total Nonperforming Assets	$	39,638	$	10,472

(1) Excludes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated. The increase in nonaccrual loans was primarily the result of the addition of two large commercial real estate relationships consisting of three loans in the first quarter of 2018.

(2) Includes $3.2 million and $2.9 million in PCI loans restructured as of September 30, 2018 and December 31, 2017, respectively.

Recorded investment in nonaccrual by class of loans

The following table sets forth the recorded investment in nonaccrual loans by class of loans for the periods presented (in thousands). The table excludes PCI loans measured at fair value at acquisition:

	Nonaccrual Loans
	September 30, 2018		December 31, 2017
Real Estate Loans:
Construction	$	55	$	86
1-4 Family Residential	1,399		1,098
Commercial	29,512		595
Commercial Loans	1,153		903
Loans to Individuals	407		255
Total	$	32,526	$	2,937

Summary of impaired loans by class of loans for the period

The following tables set forth impaired loans by class of loans, including the unpaid contractual principal balance, the recorded investment and the allowance for loan losses for the periods presented (in thousands). Impaired loans include restructured and nonaccrual loans for which the allowance was measured in accordance with section 310-10 of ASC Topic 310, “Receivables.” There were no impaired loans recorded without an allowance as of September 30, 2018 or December 31, 2017.

	September 30, 2018
	Unpaid Contractual Principal Balance		Recorded Investment		Related  Allowance for  Loan Losses
Real Estate Loans:
Construction	$	185	$	157	$	18
1-4 Family Residential	4,891		4,559		37
Commercial	33,560		32,267		5,563
Commercial Loans	2,605		2,269		340
Municipal Loans	429		429		9
Loans to Individuals	232		191		72
Total (1)	$	41,902	$	39,872	$	6,039

	December 31, 2017
	Unpaid Contractual Principal Balance		Recorded Investment		Related  Allowance for  Loan Losses
Real Estate Loans:
Construction	$	91	$	86	$	12
1-4 Family Residential	4,141		3,952		14
Commercial	1,353		1,199		14
Commercial Loans	1,665		1,605		252
Municipal Loans	502		502		10
Loans to Individuals	237		205		51
Total (1)	$	7,989	$	7,549	$	353

(1) Includes $6.4 million and $2.9 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date as of September 30, 2018 and December 31, 2017, respectively.

Aging of recorded investment in past due loans by class of loans

The following tables present the aging of the recorded investment in past due loans by class of loans (in thousands):

	September 30, 2018
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current (1)		Total
Real Estate Loans:
Construction	$	35	$	2,808	$	41	$	2,884	$	481,370	$	484,254
1-4 Family Residential	2,296		2,326		520		5,142		786,132		791,274
Commercial	252		115		123		490		1,218,224		1,218,714
Commercial Loans	1,957		722		420		3,099		319,774		322,873
Municipal Loans	—		—		—		—		344,792		344,792
Loans to Individuals	1,013		229		190		1,432		111,185		112,617
Total	$	5,553	$	6,200	$	1,294	$	13,047	$	3,261,477	$	3,274,524

	December 31, 2017
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current (1)		Total
Real Estate Loans:
Construction	$	1,302	$	1,530	$	68	$	2,900	$	472,967	$	475,867
1-4 Family Residential	8,508		1,574		862		10,944		794,397		805,341
Commercial	1,357		24		5		1,386		1,263,773		1,265,159
Commercial Loans	662		400		333		1,395		265,027		266,422
Municipal Loans	422		—		—		422		345,376		345,798
Loans to Individuals	1,526		373		93		1,992		133,777		135,769
Total	$	13,777	$	3,901	$	1,361	$	19,039	$	3,275,317	$	3,294,356

(1)    Includes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated.

Average recorded investment and interest income on impaired loans

The following table sets forth average recorded investment and interest income recognized on impaired loans by class of loans for the periods presented (in thousands). The table excludes PCI loans measured at fair value at acquisition that have not experienced further deterioration in credit quality subsequent to the acquisition date:

	Three Months Ended
	September 30, 2018				September 30, 2017
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Real Estate Loans:
Construction	$	252	$	3	$	62	$	—
1-4 Family residential	3,976		49		4,170		26
Commercial	32,580		16		1,459		2
Commercial loans	2,543		21		1,148		28
Municipal loans	466		6		537		7
Loans to Individuals	244		1		250		1
Total	$	40,061	$	96	$	7,626	$	64

	Nine Months Ended
	September 30, 2018				September 30, 2017
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Real Estate Loans:
Construction	$	150	$	4	$	301	$	—
1-4 Family Residential	3,951		138		4,322		134
Commercial	24,149		36		1,368		27
Commercial Loans	2,073		51		3,320		118
Municipal Loans	488		20		558		23
Loans to Individuals	223		3		248		4
Total	$	31,034	$	252	$	10,117	$	306

Schedule of recorded investment in loans modified

The following tables set forth the recorded balance of loans considered to be TDRs that were restructured and the type of concession during the periods presented (dollars in thousands):

	Three Months Ended September 30, 2018
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real Estate Loans:
Commercial	$	—	$	—	$	283	$	283	2
Commercial Loans	142		—		56		198		4
Loans to Individuals	—		35		—		35		1
Total	$	142	$	35	$	339	$	516	7

	Nine Months Ended September 30, 2018
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real Estate Loans:
1-4 Family Residential	$	—	$	80	$	—	$	80	1
Commercial	—		—		283		283		2
Commercial Loans	244		—		135		379		9
Loans to Individuals	8		35		13		56		4
Total	$	252	$	115	$	431	$	798	16

	Three Months Ended September 30, 2017
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Loans to Individuals	$	—	$	—	$	8	$	8	1
Total	$	—	$	—	$	8	$	8	1

	Nine Months Ended September 30, 2017
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Commercial Loans	$	810	$	—	$	—	$	810	3
Loans to Individuals	27		—		56		83		6
Total	$	837	$	—	$	56	$	893	9

Schedule of PCI Loans

The following table presents the outstanding principal balance and carrying value for PCI loans for the periods presented (in thousands):

	September 30, 2018		December 31, 2017
Outstanding principal balance	$	41,094	$	52,426
Carrying amount	$	35,671	$	45,233

Schedule of changes in accretable yield for pci loans

The following table presents the changes in the accretable yield during the periods for PCI loans (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	16,105		$	3,758		$	18,721		$	2,480
Changes in expected cash flows not affecting non-accretable differences	—			—			(1,445		)	—
Reclassifications (to) from nonaccretable discount	620			(79		)	1,389			1,735
Accretion	(733		)	(156		)	(2,673		)	(692		)
Balance at end of period	$	15,992		$	3,523		$	15,992		$	3,523

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Borrowing Arrangements (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Debt

Information related to borrowings is provided in the table below (dollars in thousands):

	September 30, 2018			December 31, 2017
Federal funds purchased and repurchase agreements:
Balance at end of period	$	8,975		$	9,498
Average amount outstanding during the period (1) (5)	9,018			8,120
Maximum amount outstanding during the period (2)	8,975			9,498
Weighted average interest rate during the period (3) (5)	1.1		%	0.2		%
Interest rate at end of period (4)	0.8		%	0.2		%
FHLB borrowings:
Balance at end of period	$	561,267		$	1,017,361
Average amount outstanding during the period (1) (5)	757,399			1,222,033
Maximum amount outstanding during the period (2)	957,231			1,414,453
Weighted average interest rate during the period (3) (5)	1.7		%	1.2		%
Interest rate at end of period (4)	2.1		%	1.4		%
Subordinated notes, net of unamortized debt issuance costs:
Balance at end of period	$	98,366		$	98,248
Average amount outstanding during the period (1) (5)	98,307			98,172
Maximum amount outstanding during the period (2)	98,366			98,248
Weighted average interest rate during the period (3) (5)	5.8		%	5.7		%
Interest rate at end of period (4)	5.5		%	5.5		%
Trust preferred subordinated debentures, net of unamortized debt issuance costs:
Balance at end of period	$	60,244		$	60,241
Average amount outstanding during the period (1) (5)	60,242			60,238
Maximum amount outstanding during the period (2)	60,244			60,241
Weighted average interest rate during the period (3) (5)	4.2		%	3.3		%
Interest rate at end of period (4)	4.4		%	3.6		%

(1) The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period.

(2) The maximum amount outstanding at any month-end during the period.

(3) The weighted average interest rate during the period was computed by dividing the actual interest expense (annualized for interim periods) by the average amount outstanding during the period. The weighted average interest rate on the FHLB borrowings includes the effect of interest rate swaps.

(4) Stated rate.

(5) Interim period averages are annualized.

Schedule of Maturities of Borrowings

Maturities of fixed rate obligations based on scheduled repayments at September 30, 2018 are as follows (in thousands):

	Payments Due by Period
	Less than 1 Year		1-2 Years		2-3 Years		3-4 Years		4-5 Years		Thereafter		Total
Federal funds purchased and repurchase agreements	$	8,588	$	387	$	—	$	—	$	—	$	—	$	8,975
FHLB borrowings	158,505		385,165		11,537		—		—		6,060		561,267
Subordinated notes, net of unamortized debt issuance costs	—		—		—		—		—		98,366		98,366
Trust preferred subordinated debentures, net of unamortized debt issuance costs	—		—		—		—		—		60,244		60,244
Total obligations	$	167,093	$	385,552	$	11,537	$	—	$	—	$	164,670	$	728,852

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2018

Defined Contribution Plan [Abstract]

The components of net periodic benefit cost

The components of net periodic benefit cost (income) related to our employee benefit plans are as follows (in thousands):

	Three Months Ended September 30,
	Defined Benefit Pension Plan						Defined Benefit Pension Plan Acquired						Restoration Plan
	2018			2017			2018			2017			2018		2017
Service cost	$	387		$	349		$	—		$	—		$	73	$	61
Interest cost	848			901			41			44			149		142
Expected return on assets	(1,621		)	(1,513		)	(73		)	(53		)	—		—
Net loss amortization	378			328			—			—			169		75
Prior service (credit) cost amortization	(3		)	(3		)	—			—			2		2
Net periodic benefit cost (income)	$	(11	)	$	62		$	(32	)	$	(9	)	$	393	$	280

	Nine Months Ended September 30,
	Defined Benefit Pension Plan						Defined Benefit Pension Plan Acquired						Restoration Plan
	2018			2017			2018			2017			2018		2017
Service cost	$	1,161		$	1,048		$	—		$	—		$	220	$	185
Interest cost	2,544			2,701			123			133			447		425
Expected return on assets	(4,863		)	(4,538		)	(218		)	(160		)	—		—
Net loss amortization	1,134			984			—			—			508		226
Prior service (credit) cost amortization	(10		)	(10		)	—			—			5		5
Net periodic benefit cost (income)	$	(34	)	$	185		$	(95	)	$	(27	)	$	1,180	$	841

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Share-based Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2018

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

Schedule of Shares Issued in Connection With Stock Compensation Awards

Shares issued in connection with stock compensation awards along with other related information are presented in the following table without the retroactive recognition of stock dividends (in thousands, except share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
New shares issued from available authorized shares	—		—		—		48,311
New shares issued from available treasury shares	65,918		77,957		128,969		89,724
Total	65,918		77,957		128,969		138,035
Proceeds from stock option exercises	$	1,571	$	1,505	$	2,655	$	2,527

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Derivative Financial Instruments and Hedging Activities (Tables)

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The following tables present the notional and estimated fair value amount of derivative positions outstanding (in thousands):

	September 30, 2018								December 31, 2017
	Estimated Fair Value								Estimated Fair Value
	Notional Amount (1)		Asset Derivative			Liability Derivative			Notional Amount (1)		Asset Derivative			Liability Derivative
Derivatives designated as hedging instruments
Interest rate contracts:
Swaps-Cash Flow Hedge-Financial institution counterparties	$	270,000	$	14,965		$	—		$	240,000	$	7,922		$	22
Swaps-Fair Value Hedge-Financial institution counterparties	21,100		102			—			—		—			—
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	94,679		3,257			307			67,220		92			612
Swaps-Customer counterparties	94,679		307			3,257			67,220		612			92
Gross derivatives			18,631			3,564					8,626			726
Offsetting derivative assets/liabilities			(307		)	(307		)			(114		)	(114		)
Cash collateral received/posted			(18,017		)	—					(7,900		)	(520		)
Net derivatives included in the consolidated balance sheets (2)			$	307		$	3,257				$	612		$	92

(1) Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

(2) Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and $307,000 related to interest rate swaps with customers at September 30, 2018. We had net credit exposure of $30,000 related to interest rate swaps with financial institutions and $612,000 related to interest rate swaps with customers at December 31, 2017. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.

Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps [Table Text Block]

The summarized expected weighted average remaining maturity of the notional amount of interest rate swaps and the weighted average interest rates associated with the amounts expected to be received or paid on interest rate swap agreements are presented below (dollars in thousands). Variable rates received on pay fixed swaps are based on one-month or three-month LIBOR rates in effect at September 30, 2018 and December 31, 2017:

	September 30, 2018							December 31, 2017
			Weighted Average							Weighted Average
	Notional Amount		Remaining Maturity  (in years)	Receive Rate		Pay Rate		Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate
Swaps-Cash Flow Hedge
Financial institution counterparties	$	270,000	5.1	2.18	%	1.58	%	$	240,000	5.3	1.44	%	1.43	%
Swaps-Fair Value Hedge
Financial institution counterparties	21,100		7.8	2.34		3.00		—		—	—		—
Swaps-Non-Hedging
Financial institution counterparties	94,679		12.1	2.12		2.58		67,220		12.7	1.39		2.37
Customer counterparties	94,679		12.1	2.58		2.12		67,220		12.7	2.37		1.39

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Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Summary of fair value measurement on recurring and nonrecurring basis segregated by level of valuation inputs within fair value hierarchy utilized to measure fair value

The following tables summarize assets measured at fair value on a recurring and nonrecurring basis segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):

	As of September 30, 2018
			Fair Value Measurements at the End of the Reporting Period Using
	Carrying Amount		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring fair value measurements
Investment Securities:
U.S. Treasury	$	19,748	$	19,748	$	—	$	—
State and Political Subdivisions	699,069		—		699,069		—
Other Stocks and Bonds	3,027		—		3,027		—
Mortgage-backed Securities: (1)
Residential	687,598		—		687,598		—
Commercial	529,835		—		529,835		—
Equity Investments:
Equity Investments (2)	5,735		5,735		—		—
Derivative assets:
Interest rate swaps	18,631		—		18,631		—
Total asset recurring fair value measurements	$	1,963,643	$	25,483	$	1,938,160	$	—
Derivative liabilities:
Interest rate swaps	$	3,564	$	—	$	3,564	$	—
Total liability recurring fair value measurements	$	3,564	$	—	$	3,564	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	1,413	$	—	$	—	$	1,413
Impaired loans (3)	33,280		—		—		33,280
Total asset nonrecurring fair value measurements	$	34,693	$	—	$	—	$	34,693

	As of December 31, 2017
			Fair Value Measurements at the End of the Reporting Period Using
	Carrying Amount		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring fair value measurements
Investment Securities:
U.S. Government Agency Debentures	$	108,869	$	—	$	108,869	$	—
State and Political Subdivisions	392,664		—		392,664		—
Other Stocks and Bonds	5,055		—		5,055		—
Equity Investments (2)	5,920		5,920		—		—
Mortgage-backed Securities: (1)
Residential	718,029		—		718,029		—
Commercial	308,218		—		308,218		—
Derivative assets:
Interest rate swaps	8,626		—		8,626		—
Total asset recurring fair value measurements	$	1,547,381	$	5,920	$	1,541,461	$	—
Derivative liabilities:
Interest rate swaps	$	726	$	—	$	726	$	—
Total liability recurring fair value measurements	$	726	$	—	$	726	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	1,767	$	—	$	—	$	1,767
Impaired loans (3)	6,536		—		—		6,536
Total asset nonrecurring fair value measurements	$	8,303	$	—	$	—	$	8,303

(1) All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(2) With the adoption of ASU 2016-01 on January 1, 2018, these investments are included in equity investments on our consolidated balance sheets. The guidance was applied on a prospective approach resulting in prior-periods no longer being comparable. See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

(3) Impaired loans represent collateral-dependent loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.

Financial assets, financial liabilities, and unrecognized financial instruments at carrying amount and fair value

The following tables present our financial assets and financial liabilities measured on a nonrecurring basis at both their respective carrying amounts and estimated fair value (in thousands):

			Estimated Fair Value
September 30, 2018	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial Assets:
Cash and cash equivalents	$	174,072	$	174,072	$	174,072	$	—	$	—
Investment Securities:
Held to maturity, at carrying value	3,087		3,030		—		3,030		—
Mortgage-backed Securities:
Held to maturity, at carrying value	160,278		153,442		—		153,442		—
FHLB stock, at cost	32,291		32,291		—		32,291		—
Equity investments	6,294		6,294		—		6,294		—
Loans, net of allowance for loan losses	3,248,432		3,179,049		—		—		3,179,049
Loans held for sale	954		954		—		954		—
Financial Liabilities:
Deposits	$	4,553,512	$	4,543,794	$	—	$	4,543,794	$	—
Federal funds purchased and repurchase agreements	8,975		8,975		—		8,975		—
FHLB borrowings	561,267		542,846		—		542,846		—
Subordinated notes, net of unamortized debt issuance costs	98,366		97,979		—		97,979		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,244		51,014		—		51,014		—

			Estimated Fair Value
December 31, 2017	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial Assets:
Cash and cash equivalents	$	198,692	$	198,692	$	198,692	$	—	$	—
Investment Securities:
Held to maturity, at carrying value	413,632		421,928		—		421,928		—
Mortgage-backed Securities:
Held to maturity, at carrying value	495,874		499,872		—		499,872		—
FHLB stock, at cost	55,729		55,729		—		55,729		—
Equity investments	5,821		5,821		—		5,821		—
Loans, net of allowance for loan losses	3,273,575		3,269,316		—		—		3,269,316
Loans held for sale	2,001		2,001		—		2,001		—
Financial Liabilities:
Deposits	$	4,515,447	$	4,506,133	$	—	$	4,506,133	$	—
Federal funds purchased and repurchase agreements	9,498		9,498		—		9,498		—
FHLB borrowings	1,017,361		1,008,292		—		1,008,292		—
Subordinated notes, net of unamortized debt issuance costs	98,248		99,665		—		99,665		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,241		47,622		—		47,622		—

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

The income tax expense included in the accompanying statements of income consists of the following (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Current income tax expense	$	95	$	3,454	$	3,107	$	9,798
Deferred income tax expense	2,097		436		4,535		453
Income tax expense	$	2,192	$	3,890	$	7,642	$	10,251

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Off-Balance-Sheet Arrangements, Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of unused commitments

Financial instruments with off-balance-sheet risk were as follows (in thousands):

	At September 30, 2018		At December 31, 2017
Unused commitments:
Commitments to extend credit	$	819,256	$	804,715
Standby letters of credit	28,197		14,890
Total	$	847,453	$	819,605

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Summary of Significant Accounting and Reporting Policies - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in debit card expense	$ (251)	$ (1,024)	$ (840)	$ (2,840)
Decrease in brokerage services income	(532)	(561)	(1,488)	(1,790)
Cumulative effect of new accounting principle	(85)		(85)
Increase in salaries and employee benefits expense	17,628	14,472	52,820	45,463
Decrease in other Noninterest Expense	2,733	$ 2,622	8,945	$ 7,715
Securities available for sale, at estimated fair value						$ 1,538,755
Securities available for sale	1,994,073		1,994,073
Held-to-maturity securities	163,365		163,365			$ 909,506
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in debit card expense	1,000		2,800
Decrease in brokerage expense	172		474
Decrease in brokerage services income	172		474
Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investments					$ 5,900
Securities available for sale, at estimated fair value					(5,900)
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in salaries and employee benefits expense	77		234
Decrease in other Noninterest Expense	(77)		(234)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Securities available for sale					743,400
Held-to-maturity securities					(743,400)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle	(85)		(85)
Retained Earnings | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle					$ (85)
Deposit services | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in deposit services income	$ 1,000		$ 2,800

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Summary of Significant Accounting and Reporting Policies Accounting Pronouncements (Details) - Scenario, Forecast - Accounting Standards Update 2017-08 $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Amortization expense	$ (2,900)
Cumulative Effect on Retained Earnings, before Tax	$ (14,400)

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Acquisition (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)	Nov. 30, 2017 banking_offices
Goodwill [Roll Forward]
Balance as of December 31, 2017	$ 201,246
Less: measurement period adjustments	(130)
Balance as of September 30, 2018	$ 201,116
Diboll State Bancshares, Inc.
Business Acquisition [Line Items]
Voting interests acquired		100.00%
Number of banking centers | banking_offices		17

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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic and Diluted Earnings:
Net income	$ 20,303	$ 14,511	$ 56,757	$ 43,981
Basic weighted-average shares outstanding (in shares)	35,114,000	29,370,000	35,066,000	29,326,000
Add: Stock awards (in shares)	174,000	200,000	175,000	205,000
Diluted weighted-average shares outstanding (in shares)	35,288,000	29,570,000	35,241,000	29,531,000
Basic Earnings Per Share:
Earnings per common share - basic (in dollars per share)	$ 0.58	$ 0.49	$ 1.62	$ 1.50
Diluted Earnings Per Share:
Earnings per common share - diluted (in dollars per share)	$ 0.58	$ 0.49	$ 1.61	$ 1.49
Antidilutive securities excluded from calculating earnings
Number of antidilutive options (in shares)	84,000	45,000	61,000	49,000

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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax				$ 754,140		$ 518,274
Income tax benefit (expense)		$ 3,102	$ (166)	8,691		(6,599)
Ending balance, net of tax		752,506	556,023	752,506		556,023
Cumulative effect of new accounting principle		(85)		(85)
Retained Earnings
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax				32,851		30,098
Ending balance, net of tax		58,578	25,677	58,578		25,677
Cumulative effect of new accounting principle		(85)		(85)
Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		(42,536)	(11,644)	(16,295)		(23,708)
Other comprehensive (loss) income before reclassifications		(16,885)	344	(52,757)		18,450
Reclassified from accumulated other comprehensive income		80	(137)	2,736	[1]	317
Income tax benefit (expense)		3,529	(72)	10,504		(6,568)
Net current-period other comprehensive (loss) income, net of tax		(13,276)	135	(39,517)		12,199
Ending balance, net of tax		(55,812)	(11,509)	(55,812)		(11,509)
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		10,753	3,957	6,399		4,595
Other comprehensive (loss) income before reclassifications		1,894	(236)	7,864		(1,811)
Reclassified from accumulated other comprehensive income		(406)	101	(864)		694
Income tax benefit (expense)		(312)	47	(1,470)		391
Net current-period other comprehensive (loss) income, net of tax		1,176	(88)	5,530		(726)
Ending balance, net of tax		11,929	3,869	11,929		3,869
Net Prior Service (Cost) Credit
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		(135)	(136)	(133)		(133)
Other comprehensive (loss) income before reclassifications		0	0	0		0
Reclassified from accumulated other comprehensive income	[2]	(1)	(1)	(5)		(5)
Income tax benefit (expense)		0	0	2		1
Net current-period other comprehensive (loss) income, net of tax		(1)	(1)	(3)		(4)
Ending balance, net of tax		(136)	(137)	(136)		(137)
Net Gain (Loss)
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		(25,404)	(18,722)	(26,269)		(19,247)
Other comprehensive (loss) income before reclassifications		0	0	0		0
Reclassified from accumulated other comprehensive income	[2]	547	403	1,642		1,210
Income tax benefit (expense)		(115)	(141)	(345)		(423)
Net current-period other comprehensive (loss) income, net of tax		432	262	1,297		787
Ending balance, net of tax		(24,972)	(18,460)	(24,972)		(18,460)
Total
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		(57,322)	(26,545)	(36,298)		(38,493)
Other comprehensive (loss) income before reclassifications		(14,991)	108	(44,893)		16,639
Reclassified from accumulated other comprehensive income		220	366	3,509	[1]	2,216
Income tax benefit (expense)		3,102	(166)	8,691		(6,599)
Net current-period other comprehensive (loss) income, net of tax		(11,669)	308	(32,693)		12,256
Ending balance, net of tax		(68,991)	$ (26,237)	(68,991)		$ (26,237)
Accounting Standards Update 2016-01 | Retained Earnings
AOCI Attributable to Parent, Net of Tax
Cumulative effect of new accounting principle before tax		$ (107)		$ (107)
Cumulative effect of new accounting principle							$ (85)

[1] As discussed in “Note 1 – Summary of Significant Accounting and Reporting Policies,” the Company adopted ASU 2016-01 on January 1, 2018. This amount includes a reclassification for the cumulative adjustment to retained earnings of $107,000 ($85,000, net of tax).

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 8 - Employee Benefit Plans.”

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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized losses		$ (661)	$ 490	$ 729		$ 1,191
Tax benefit (expense)		(2,192)	(3,890)	(7,642)		(10,251)
Total reclassifications for the period, net of tax		(174)	(237)	(2,689)		(1,440)
Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(80)	137	(2,736)	[1]	(317)
Realized net loss on interest rate swap derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		406	(101)	864		(694)
Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[2]	(547)	(403)	(1,642)		(1,210)
Prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[2]	1	1	5		5
Amortization of pension plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(546)	(402)	(1,637)		(1,205)
Tax benefit		115	141	343		422
Total reclassifications for the period, net of tax		(431)	(261)	(1,294)		(783)
Unrealized losses on securities transferred from held to maturity to available for sale: | Reclassification out of accumulated other comprehensive income | Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized losses	[3]	661	(490)	(729)		(1,191)
Tax benefit (expense)		(139)	172	153		417
Net of tax		522	(318)	(576)		(774)
Unrealized gains and losses on available for sale securities | Reclassification out of accumulated other comprehensive income | Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit (expense)		156	(220)	399		(306)
Net of tax		(585)	407	(1,501)		568
Realized net (loss) gain on sale of securities	[4]	(741)	627	(1,900)		874
Interest rate swap derivatives | Reclassification out of accumulated other comprehensive income | Realized net loss on interest rate swap derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit (expense)		(81)	43	(168)		261
Net of tax		303	(79)	631		(485)
Realized net gain (loss) on interest rate swap derivatives	[5]	384	(122)	799		(746)
Interest rate swap derivatives | Reclassification out of accumulated other comprehensive income | Amortization of unrealized gains on terminated interest rate swap derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit (expense)		(5)	(7)	(14)		(18)
Net of tax		17	14	51		34
Realized net gain (loss) on interest rate swap derivatives	[5]	$ 22	$ 21	$ 65		$ 52

[1] As discussed in “Note 1 – Summary of Significant Accounting and Reporting Policies,” the Company adopted ASU 2016-01 on January 1, 2018. This amount includes a reclassification for the cumulative adjustment to retained earnings of $107,000 ($85,000, net of tax).

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 8 - Employee Benefit Plans.”

[3] Included in interest income on the consolidated statements of income.

[4] Listed as net (loss) gain on sale of securities available for sale on the consolidated statements of income.

[5] Included in interest expense for FHLB borrowings on the consolidated statements of income.

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Securities - Schedule of Debt and Equity Securities Components (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
AVAILABLE FOR SALE
Amortized Cost		$ 1,994,073
Gross unrealized gains		6,976
Gross unrealized losses		61,772
Estimated fair value		1,939,277
Amortized Cost			$ 1,541,967
Gross unrealized gains			9,163
Gross unrealized losses			12,375
Estimated fair value			1,538,755
HELD TO MATURITY
Amortized cost		163,365	909,506
Gross unrealized gains		208	16,322
Gross unrealized losses		7,101	4,028
Estimated Fair Value		156,472	921,800
US Treasury Securities [Member]
AVAILABLE FOR SALE
Amortized Cost		19,706
Gross unrealized gains		42
Gross unrealized losses		0
Estimated fair value		19,748
US Government Agency Debentures
AVAILABLE FOR SALE
Amortized Cost			108,869
Gross unrealized gains			0
Gross unrealized losses			0
Estimated fair value			108,869
State and Political Subdivisions
AVAILABLE FOR SALE
Amortized Cost		718,237
Gross unrealized gains		4,666
Gross unrealized losses		23,834
Estimated fair value		699,069
Amortized Cost			392,760
Gross unrealized gains			3,895
Gross unrealized losses			3,991
Estimated fair value			392,664
HELD TO MATURITY
Amortized cost		3,087	413,632
Gross unrealized gains		0	10,879
Gross unrealized losses		57	2,583
Estimated Fair Value		3,030	421,928
Other Stocks and Bonds
AVAILABLE FOR SALE
Amortized Cost		3,000
Gross unrealized gains		27
Gross unrealized losses		0
Estimated fair value		3,027
Amortized Cost			5,024
Gross unrealized gains			31
Gross unrealized losses			0
Estimated fair value			5,055
Other Equity Securities
AVAILABLE FOR SALE
Amortized Cost	[1]		6,027
Gross unrealized gains	[1]		0
Gross unrealized losses	[1]		107
Estimated fair value	[1]		5,920
Residential
AVAILABLE FOR SALE
Amortized Cost	[2]	708,137
Gross unrealized gains	[2]	1,997
Gross unrealized losses	[2]	22,536
Estimated fair value	[2]	687,598
Amortized Cost	[2]		720,930
Gross unrealized gains	[2]		4,476
Gross unrealized losses	[2]		7,377
Estimated fair value	[2]		718,029
HELD TO MATURITY
Amortized cost	[2]	59,679	129,044
Gross unrealized gains	[2]	143	1,631
Gross unrealized losses	[2]	3,015	239
Estimated Fair Value	[2]	56,807	130,436
Commercial
AVAILABLE FOR SALE
Amortized Cost	[2]	544,993
Gross unrealized gains	[2]	244
Gross unrealized losses	[2]	15,402
Estimated fair value	[2]	529,835
Amortized Cost	[2]		308,357
Gross unrealized gains	[2]		761
Gross unrealized losses	[2]		900
Estimated fair value	[2]		308,218
HELD TO MATURITY
Amortized cost	[2]	100,599	366,830
Gross unrealized gains	[2]	65	3,812
Gross unrealized losses	[2]	4,029	1,206
Estimated Fair Value	[2]	$ 96,635	$ 369,436

[1] See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

[2] All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value		$ 1,034,997
Less than 12 months, fair value			$ 614,799
More than 12 Months, fair value		575,351
More than 12 months, fair value			288,113
Total fair value		1,610,348
Total fair value			902,912
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss		28,722
Less than 12 Months, unrealized loss			3,879
More than 12 Months, unrealized Loss		33,050
More than 12 months, unrealized loss			8,496
Total unrealized loss		61,772
Total unrealized loss			12,375
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value		100,059	246,806
More than 12 Months, fair value		46,045	73,024
Total fair value		146,104	319,830
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Less than 12 months, unrealized loss		4,074	1,746
More than 12 months, unrealized loss		3,027	2,282
Total unrealized loss		7,101	4,028
State and Political Subdivisions
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value		287,571
Less than 12 months, fair value			32,341
More than 12 Months, fair value		244,510
More than 12 months, fair value			172,006
Total fair value		532,081
Total fair value			204,347
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss		7,728
Less than 12 Months, unrealized loss			121
More than 12 Months, unrealized Loss		16,106
More than 12 months, unrealized loss			3,870
Total unrealized loss		23,834
Total unrealized loss			3,991
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value		1,761	85,608
More than 12 Months, fair value		1,269	56,736
Total fair value		3,030	142,344
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Less than 12 months, unrealized loss		23	807
More than 12 months, unrealized loss		34	1,776
Total unrealized loss		57	2,583
Other Equity Securities
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 months, fair value	[1]		5,920
More than 12 months, fair value	[1]		0
Total fair value	[1]		5,920
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss	[1]		107
More than 12 months, unrealized loss	[1]		0
Total unrealized loss	[1]		107
Residential
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value		332,230
Less than 12 months, fair value			429,742
More than 12 Months, fair value		285,356
More than 12 months, fair value			102,973
Total fair value		617,586
Total fair value			532,715
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss		8,003
Less than 12 Months, unrealized loss			3,232
More than 12 Months, unrealized Loss		14,533
More than 12 months, unrealized loss			4,145
Total unrealized loss		22,536
Total unrealized loss			7,377
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value		48,022	24,707
More than 12 Months, fair value		6,781	2,736
Total fair value		54,803	27,443
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Less than 12 months, unrealized loss		2,473	157
More than 12 months, unrealized loss		542	82
Total unrealized loss		3,015	239
Commercial
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value		415,196
Less than 12 months, fair value			146,796
More than 12 Months, fair value		45,485
More than 12 months, fair value			13,134
Total fair value		460,681
Total fair value			159,930
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss		12,991
Less than 12 Months, unrealized loss			419
More than 12 Months, unrealized Loss		2,411
More than 12 months, unrealized loss			481
Total unrealized loss		15,402
Total unrealized loss			900
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value		50,276	136,491
More than 12 Months, fair value		37,995	13,552
Total fair value		88,271	150,043
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Less than 12 months, unrealized loss		1,578	782
More than 12 months, unrealized loss		2,451	424
Total unrealized loss		$ 4,029	$ 1,206

[1] See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

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Securities - Interest Income on Securities (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
U.S. Treasury		$ 10	$ 0	$ 141	$ 519
U.S. Government Agency Debentures		0	0	89	0
State and Political Subdivisions		6,331	5,670	19,065	18,381
Other Stocks and Bonds		26	27	84	96
Other Equity Securities	[1]	0	31	0	87
Mortgage-backed Securities		10,086	10,567	31,190	31,430
Total interest income on securities		$ 16,453	$ 16,295	$ 50,569	$ 50,513

[1] See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available for sale, Amortized Cost
Due in one year or less	$ 3,557
Due after one year through five years	49,413
Due after five years through ten years	183,420
Due after ten years	504,553
Total available-for-sale investment securities	740,943
Mortgage-backed Securities	1,253,130
Amortized Cost	1,994,073
Available for sale, Fair Value
Due in one year or less	3,616
Due after one year through five years	50,431
Due after five years through ten years	181,041
Due after ten years	486,756
Total available-for-sale investment securities	721,844
Mortgage-backed Securities	1,217,433
Total	1,939,277
Held to maturity, Amortized Cost
Due in one year or less	115
Due after one year through five years	1,700
Due after five years through ten years	1,272
Due after ten years	0
Total held-to-maturity investment securities	3,087
Mortgage-backed securities	160,278
Amortized cost	163,365	$ 909,506
Held to maturity, Fair Value
Due in one year or less	115
Due after one year through five years	1,670
Due after five years through ten years	1,245
Due after ten years	0
Total held-to-maturity investment securities	3,030
Mortgage-backed securities	153,442
Fair Value	$ 156,472	$ 921,800

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Securities - Unrealized and Realized Gain (Loss) Recognized in Net Income on Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Gain (Loss) on Securities [Line Items]
Net (losses) recognized during the period on equity investments	$ (42)	$ (176)
Less: Net gains and (losses) recognized during the period on equity investments sold during the period	0	0
Unrealized (losses) recognized during the reporting period on equity investments still held at the reporting date	$ (42)	$ (176)

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Securities - Narrative (Details)			3 Months Ended		9 Months Ended		12 Months Ended
		Jan. 01, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Investment [Line Items]
Transferred Securities, Unrealized Loss, Before Tax			$ 15,800,000		$ 15,800,000		$ 17,400,000
Securities transferred, Unrealized Loss, Net of Tax			12,500,000		12,500,000		13,800,000
Fair value of securities transferred from AFS to HTM					0		0
Securities available for sale, at estimated fair value			1,939,277,000		1,939,277,000
Securities available for sale, at estimated fair value							1,538,755,000
Unrealized net gain on securities transferred from held to maturity to available for sale, before tax		$ 11,881,000	$ 0	$ 0	$ 11,881,000	$ 0
Unrealized net gain on securities transferred from held to maturity to available for sale, net of tax		9,400,000
AFS securities and HTM securities with other-than-temporary impairment			0		0
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Net realized (loss) gain on AFS securities					$ (1,900,000)	874,000
Gross realized gains on AFS securities					1,900,000	4,700,000
Gross realized loss on AFS securities					3,800,000	3,800,000
Carrying value of investment securities pledged as collateral			$ 1,150,000,000		1,150,000,000		1,240,000,000
Equity investments			$ 12,029,000		$ 12,029,000
Equity investments without readily determinable fair value							5,821,000
Equity investments with other-than-temporary impairment			0		0
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Sale of HTM portfolio					$ 0	$ 0
Accounting Standards Update 2016-01
Investment [Line Items]
Securities available for sale, at estimated fair value		(5,900,000)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12
Investment [Line Items]
Securities available for sale, at estimated fair value		$ 743,400,000
Other Equity Securities
Investment [Line Items]
Securities available for sale, at estimated fair value	[1]						5,920,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Unrealized losses on equity investment included in AFS securities	[1]						$ 85,000

[1] See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

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Loans and Allowance for Probable Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		$ 3,274,524	$ 3,294,356
Less: Allowance for loan losses	[1]	26,092	20,781
Net Loans		3,248,432	3,273,575
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		484,254	475,867
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		791,274	805,341
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		1,218,714	1,265,159
Commercial Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		322,873	266,422
Municipal Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		344,792	345,798
Loans to Individuals
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		112,617	135,769
Purchase Credit Impaired (PCI) Loans
Loans and Leases Receivable Disclosure [Abstract]
Less: Allowance for loan losses	[1]	$ 824	$ 0

[1] Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss. The allowance for loan loss recorded on purchase credit impaired (“PCI”) loans totaled $824,000 as of September 30, 2018. There was no allowance for loan loss recorded on PCI loans as of December 31, 2017.

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Loans and Allowance for Probable Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	[1]	$ 26,092,000		$ 26,092,000			$ 20,781,000
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period		25,072,000	$ 19,241,000	20,781,000	[2]	$ 17,911,000
Provision (reversal) for loan losses	[3]	975,000	960,000	5,991,000		3,404,000
Loans charged off		(662,000)	(677,000)	(2,346,000)		(2,819,000)
Recoveries of loans charged off		707,000	347,000	1,666,000		1,375,000
Balance at end of period		26,092,000	19,871,000	26,092,000		19,871,000
Provision for loan losses		975,000	960,000	5,991,000		3,404,000
Provision for PCI Loans		466,000	50,000	824,000		50,000
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period		3,841,000	3,573,000	3,676,000	[2]	4,147,000
Provision (reversal) for loan losses		(717,000)	(20,000)	(538,000)		(560,000)
Loans charged off		0	0	(14,000)		(35,000)
Recoveries of loans charged off		0	0	0		1,000
Balance at end of period		3,124,000	3,553,000	3,124,000		3,553,000
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period		2,730,000	2,392,000	2,445,000	[2]	2,665,000
Provision (reversal) for loan losses		585,000	34,000	906,000		46,000
Loans charged off		(8,000)	(11,000)	(65,000)		(299,000)
Recoveries of loans charged off		331,000	10,000	352,000		13,000
Balance at end of period		3,638,000	2,425,000	3,638,000		2,425,000
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period		14,036,000	9,970,000	10,821,000	[2]	7,204,000
Provision (reversal) for loan losses		290,000	383,000	3,499,000		3,140,000
Loans charged off		0	0	0		0
Recoveries of loans charged off		5,000	2,000	11,000		11,000
Balance at end of period		14,331,000	10,355,000	14,331,000		10,355,000
Commercial Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period		2,560,000	1,624,000	2,094,000	[2]	2,263,000
Provision (reversal) for loan losses		533,000	189,000	1,194,000		(84,000)
Loans charged off		(13,000)	(73,000)	(270,000)		(650,000)
Recoveries of loans charged off		105,000	89,000	167,000		300,000
Balance at end of period		3,185,000	1,829,000	3,185,000		1,829,000
Municipal Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period		859,000	765,000	860,000	[2]	750,000
Provision (reversal) for loan losses		5,000	41,000	4,000		56,000
Loans charged off		0	0	0		0
Recoveries of loans charged off		0	0	0		0
Balance at end of period		864,000	806,000	864,000		806,000
Loans to Individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period		1,046,000	917,000	885,000	[2]	882,000
Provision (reversal) for loan losses		279,000	333,000	926,000		806,000
Loans charged off		(641,000)	(593,000)	(1,997,000)		(1,835,000)
Recoveries of loans charged off		266,000	246,000	1,136,000		1,050,000
Balance at end of period		950,000	$ 903,000	950,000		$ 903,000
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	[1]	$ 824,000		$ 824,000			$ 0

[1] Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss. The allowance for loan loss recorded on purchase credit impaired (“PCI”) loans totaled $824,000 as of September 30, 2018. There was no allowance for loan loss recorded on PCI loans as of December 31, 2017.

[2] Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss.

[3] Of the $975,000 and $6.0 million recorded in provision for loan losses for the three and nine months ended September 30, 2018, $466,000 and $824,000 related to provision expense on PCI loans, respectively. Of the $960,000 and $3.4 million recorded in provision for loan losses for the three and nine months ended September 30, 2017, $50,000 related to provision expense on PCI loans.

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Loans and Allowance for Probable Loan Losses - Allowance Balance, by Impairment Method (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Loans and Leases Receivable, Allowance	[1]	$ 26,092		$ 20,781
Ending balance - individually evaluated for impairment	[2]	6,039		353
Ending balance - collectively evaluated for impairment		20,053		20,428
Balance at end of period		26,092	$ 25,072	20,781	[3]	$ 19,871	$ 19,241	$ 17,911
Construction Real Estate Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[2]	18		12
Ending balance - collectively evaluated for impairment		3,106		3,664
Balance at end of period		3,124	3,841	3,676	[3]	3,553	3,573	4,147
1-4 Family Residential Real Estate Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[2]	37		14
Ending balance - collectively evaluated for impairment		3,601		2,431
Balance at end of period		3,638	2,730	2,445	[3]	2,425	2,392	2,665
Commercial Real Estate Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[2]	5,563		14
Ending balance - collectively evaluated for impairment		8,768		10,807
Balance at end of period		14,331	14,036	10,821	[3]	10,355	9,970	7,204
Commercial Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[2]	340		252
Ending balance - collectively evaluated for impairment		2,845		1,842
Balance at end of period		3,185	2,560	2,094	[3]	1,829	1,624	2,263
Municipal Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[2]	9		10
Ending balance - collectively evaluated for impairment		855		850
Balance at end of period		864	859	860	[3]	806	765	750
Loans to Individuals
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[2]	72		51
Ending balance - collectively evaluated for impairment		878		834
Balance at end of period		950	$ 1,046	885	[3]	$ 903	$ 917	$ 882
Financial Asset Acquired with Credit Deterioration [Member]
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Loans and Leases Receivable, Allowance	[1]	$ 824		$ 0

[1] Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss. The allowance for loan loss recorded on purchase credit impaired (“PCI”) loans totaled $824,000 as of September 30, 2018. There was no allowance for loan loss recorded on PCI loans as of December 31, 2017.

[2] The allowance for loan loss on PCI loans totaled $824,000 as of September 30, 2018. There was no allowance for loan losses associated with PCI loans as of December 31, 2017.

[3] Loans acquired with the Diboll acquisition were measured at fair value on November 30, 2017 with no carryover of allowance for loan loss.

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Loans and Allowance for Probable Loan Losses - Allowance for Loan Losses, Loan Portfolio, by Impairment Method (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	$ 33,428	$ 4,698
Loans collectively evaluated for impairment	3,205,425	3,244,425
Purchased credit impaired loans	35,671	45,233
Total ending loan balance	3,274,524	3,294,356
Construction Real Estate Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	54	86
Loans collectively evaluated for impairment	483,996	475,505
Purchased credit impaired loans	204	276
Total ending loan balance	484,254	475,867
1-4 Family Residential Real Estate Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	1,245	1,581
Loans collectively evaluated for impairment	778,830	797,111
Purchased credit impaired loans	11,199	6,649
Total ending loan balance	791,274	805,341
Commercial Real Estate Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	29,938	895
Loans collectively evaluated for impairment	1,167,687	1,232,327
Purchased credit impaired loans	21,089	31,937
Total ending loan balance	1,218,714	1,265,159
Commercial Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	1,594	1,429
Loans collectively evaluated for impairment	318,726	259,745
Purchased credit impaired loans	2,553	5,248
Total ending loan balance	322,873	266,422
Municipal Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	429	502
Loans collectively evaluated for impairment	344,363	345,296
Purchased credit impaired loans	0	0
Total ending loan balance	344,792	345,798
Loans to Individuals
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	168	205
Loans collectively evaluated for impairment	111,823	134,441
Purchased credit impaired loans	626	1,123
Total ending loan balance	$ 112,617	$ 135,769

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Loans and Allowance for Probable Loan Losses - Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		$ 3,274,524	$ 3,294,356
Purchased credit impaired loans		35,671	45,233
Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		3,122,431	3,131,151
Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	26,305	39,808
Purchased credit impaired loans		25	362
Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	41,422	31,223
Purchased credit impaired loans		2,100	6,000
Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	80,440	90,629
Purchased credit impaired loans		6,100	10,500
Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	3,926	1,545
Purchased credit impaired loans		2,400	925
Construction Real Estate Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		484,254	475,867
Purchased credit impaired loans		204	276
Construction Real Estate Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		483,704	471,446
Construction Real Estate Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	382	3,329
Construction Real Estate Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	5	77
Construction Real Estate Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	122	982
Construction Real Estate Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	41	33
1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		791,274	805,341
Purchased credit impaired loans		11,199	6,649
1-4 Family Residential Real Estate Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		782,330	796,639
1-4 Family Residential Real Estate Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	458	559
1-4 Family Residential Real Estate Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	553	857
1-4 Family Residential Real Estate Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	6,635	6,610
1-4 Family Residential Real Estate Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	1,298	676
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		1,218,714	1,265,159
Purchased credit impaired loans		21,089	31,937
Commercial Real Estate Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		1,086,806	1,136,576
Commercial Real Estate Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	24,346	26,275
Commercial Real Estate Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	35,944	25,301
Commercial Real Estate Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	69,614	76,625
Commercial Real Estate Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	2,004	382
Commercial Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		322,873	266,422
Purchased credit impaired loans		2,553	5,248
Commercial Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		314,422	247,430
Commercial Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	1,104	9,625
Commercial Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	4,043	3,956
Commercial Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	3,030	5,203
Commercial Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	274	208
Municipal Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		344,792	345,798
Purchased credit impaired loans		0	0
Municipal Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		343,504	344,366
Municipal Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	0	0
Municipal Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	859	930
Municipal Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	429	502
Municipal Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	0	0
Loans to Individuals
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		112,617	135,769
Purchased credit impaired loans		626	1,123
Loans to Individuals | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		111,665	134,694
Loans to Individuals | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	15	20
Loans to Individuals | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	18	102
Loans to Individuals | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	610	707
Loans to Individuals | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	$ 309	$ 246

[1] Includes PCI loans comprised of $25,000 pass watch, $2.1 million special mention, $6.1 million substandard and $2.4 doubtful as of September 30, 2018. Includes PCI loans comprised of $362,000 pass watch, $6.0 million special mention, $10.5 million substandard and $925,000 doubtful as of December 31, 2017.

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Loans and Allowance for Probable Loan Losses - Nonperforming Assets by Asset Class (Details) $ in Thousands		9 Months Ended
		Sep. 30, 2018 USD ($) Customer_relationships Loan	Dec. 31, 2017 USD ($)
Nonperforming Assets by Asset Class [Abstract]
Nonaccrual loans	[1]	$ 32,526	$ 2,937
Accruing loans past due more than 90 days	[1]	0	1
Restructured loans	[2]	5,699	5,767
Other real estate owned		1,413	1,613
Repossessed assets		0	154
Total Nonperforming Assets		$ 39,638	10,472
Number of commercial real estate relationships added to nonaccrual | Customer_relationships		2
Number of commercial real estate loans added to nonaccrual | Loan		3
PCI loans restructured		$ 3,200	$ 2,900

[1] Excludes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated.

[2] Includes $3.2 million and $2.9 million in PCI loans restructured as of September 30, 2018 and December 31, 2017, respectively.

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Loans and Allowance for Probable Loan Losses - Nonaccrual by Class of Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	$ 32,526	$ 2,937
Construction Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		55	86
1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		1,399	1,098
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		29,512	595
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		1,153	903
Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		$ 407	$ 255

[1] Excludes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated.

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Loans and Allowance for Probable Loan Losses - Impaired Loans by Class of Loan (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	[1]	$ 41,902	$ 7,989
Recorded Investment	[1]	39,872	7,549
Related Allowance for Loan Losses	[1]	6,039	353
PCI loans that experienced deterioration in credit quality subsequent to acquisition		6,400	2,900
Construction Real Estate Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance		185	91
Recorded Investment		157	86
Related Allowance for Loan Losses		18	12
1-4 Family Residential Real Estate Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance		4,891	4,141
Recorded Investment		4,559	3,952
Related Allowance for Loan Losses		37	14
Commercial Real Estate Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance		33,560	1,353
Recorded Investment		32,267	1,199
Related Allowance for Loan Losses		5,563	14
Commercial Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance		2,605	1,665
Recorded Investment		2,269	1,605
Related Allowance for Loan Losses		340	252
Municipal Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance		429	502
Recorded Investment		429	502
Related Allowance for Loan Losses		9	10
Loans to Individuals
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance		232	237
Recorded Investment		191	205
Related Allowance for Loan Losses		$ 72	$ 51

[1] Includes $6.4 million and $2.9 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date as of September 30, 2018 and December 31, 2017, respectively.

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Loans and Allowance for Probable Loan Losses - Aging of Past Due Loans by Class of Loan (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 13,047	$ 19,039
Current	[1]	3,261,477	3,275,317
Total ending loan balance		3,274,524	3,294,356
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,553	13,777
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		6,200	3,901
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,294	1,361
Construction Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,884	2,900
Current	[1]	481,370	472,967
Total ending loan balance		484,254	475,867
Construction Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		35	1,302
Construction Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,808	1,530
Construction Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		41	68
1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,142	10,944
Current	[1]	786,132	794,397
Total ending loan balance		791,274	805,341
1-4 Family Residential Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,296	8,508
1-4 Family Residential Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,326	1,574
1-4 Family Residential Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		520	862
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		490	1,386
Current	[1]	1,218,224	1,263,773
Total ending loan balance		1,218,714	1,265,159
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		252	1,357
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		115	24
Commercial Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		123	5
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,099	1,395
Current	[1]	319,774	265,027
Total ending loan balance		322,873	266,422
Commercial Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,957	662
Commercial Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		722	400
Commercial Loans | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		420	333
Municipal Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	422
Current	[1]	344,792	345,376
Total ending loan balance		344,792	345,798
Municipal Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	422
Municipal Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Municipal Loans | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,432	1,992
Current	[1]	111,185	133,777
Total ending loan balance		112,617	135,769
Loans to Individuals | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,013	1,526
Loans to Individuals | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		229	373
Loans to Individuals | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 190	$ 93

[1] cludes PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales can be reasonably estimated.

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Loans and Allowance for Probable Loan Losses - Interest Income on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
Average recorded investment	$ 40,061	$ 7,626	$ 31,034	$ 10,117
Interest income recognized	96	64	252	306
Construction Real Estate Loans
Financing Receivable, Impaired [Line Items]
Average recorded investment	252	62	150	301
Interest income recognized	3	0	4	0
1-4 Family Residential Real Estate Loans
Financing Receivable, Impaired [Line Items]
Average recorded investment	3,976	4,170	3,951	4,322
Interest income recognized	49	26	138	134
Commercial Real Estate Loans
Financing Receivable, Impaired [Line Items]
Average recorded investment	32,580	1,459	24,149	1,368
Interest income recognized	16	2	36	27
Commercial Loans
Financing Receivable, Impaired [Line Items]
Average recorded investment	2,543	1,148	2,073	3,320
Interest income recognized	21	28	51	118
Municipal Loans
Financing Receivable, Impaired [Line Items]
Average recorded investment	466	537	488	558
Interest income recognized	6	7	20	23
Loans to Individuals
Financing Receivable, Impaired [Line Items]
Average recorded investment	244	250	223	248
Interest income recognized	$ 1	$ 1	$ 3	$ 4

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Loans and Allowance for Probable Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) contract	Sep. 30, 2017 USD ($) contract	Sep. 30, 2018 USD ($) contract	Sep. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items]
Extend Amortization Period	$ 142	$ 0	$ 252	$ 837
Interest Rate Reductions	35	0	115	0
Combination	339	8	431	56
Total Modifications	$ 516	$ 8	$ 798	$ 893
Number of Loans | contract	7	1	16	9
1-4 Family Residential Real Estate Loans
Financing Receivable, Modifications [Line Items]
Extend Amortization Period			$ 0
Interest Rate Reductions			80
Combination			0
Total Modifications			$ 80
Number of Loans | contract			1
Commercial Real Estate Loans
Financing Receivable, Modifications [Line Items]
Extend Amortization Period	$ 0		$ 0
Interest Rate Reductions	0		0
Combination	283		283
Total Modifications	$ 283		$ 283
Number of Loans | contract	2		2
Commercial Loans
Financing Receivable, Modifications [Line Items]
Extend Amortization Period	$ 142		$ 244	$ 810
Interest Rate Reductions	0		0	0
Combination	56		135	0
Total Modifications	$ 198		$ 379	$ 810
Number of Loans | contract	4		9	3
Loans to Individuals
Financing Receivable, Modifications [Line Items]
Extend Amortization Period	$ 0	$ 0	$ 8	$ 27
Interest Rate Reductions	35	0	35	0
Combination	0	8	13	56
Total Modifications	$ 35	$ 8	$ 56	$ 83
Number of Loans | contract	1	1	4	6

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Loans and Allowance for Probable Loan Losses - Purchased Credit Impaired (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Purchased Credit Impaired [Abstract]
Outstanding principal balance	$ 41,094		$ 41,094		$ 52,426
Carrying amount	35,671		35,671		$ 45,233
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	16,105	$ 3,758	18,721	$ 2,480
Changes in expected cash flows not affecting non-accretable differences	0	0	(1,445)	0
Reclassifications (to) from nonaccretable discount	620	(79)	1,389	1,735
Accretion	(733)	(156)	(2,673)	(692)
Balance at end of period	$ 15,992	$ 3,523	$ 15,992	$ 3,523

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Loans and Allowance for Probable Loan Losses - Narrative (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Owner and nonowner-occupied real estate	$ 1,110,000,000
Loans secured by multi-family properties	87,800,000
Loans secured by farmland	19,400,000
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans in process of foreclosure	232,000	$ 154,000
Loans and leases receivable, impaired, commitment to lend	0		$ 0
Impaired loans without an allowance	0	$ 0
Minimum
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan review larger dollar loan relationship scope, aggregate debt	500,000
Specifically reserved loans or loan relationships threshold	$ 150,000

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Borrowing Arrangements (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Federal funds purchased and repurchase agreements		$ 8,975	$ 9,498
FHLB borrowings		561,267	1,017,361
Subordinated notes, net of unamortized debt issuance costs:		98,366	98,248
Trust preferred subordinated debentures, net of unamortized debt issuance costs		60,244	60,241
Federal funds purchased and repurchase agreements:
Debt Instrument [Line Items]
Average amount outstanding during the period	[1],[2]	9,018	8,120
Maximum amount outstanding during the period	[3]	$ 8,975	$ 9,498
Weighted average interest rate during the period	[1],[4]	1.10%	0.20%
Interest rate at end of the period	[5]	0.80%	0.20%
FHLB borrowings:
Debt Instrument [Line Items]
Average amount outstanding during the period	[1],[2]	$ 757,399	$ 1,222,033
Maximum amount outstanding during the period	[3]	$ 957,231	$ 1,414,453
Weighted average interest rate during the period	[1],[4]	1.70%	1.20%
Interest rate at end of the period	[5]	2.10%	1.40%
Subordinated notes, net of unamortized debt issuance costs:
Debt Instrument [Line Items]
Average amount outstanding during the period	[1],[2]	$ 98,307	$ 98,172
Maximum amount outstanding during the period	[3]	$ 98,366	$ 98,248
Weighted average interest rate during the period	[1],[4]	5.80%	5.70%
Interest rate at end of the period	[5]	5.50%	5.50%
Trust preferred subordinated debentures, net of unamortized debt issuance costs:
Debt Instrument [Line Items]
Average amount outstanding during the period	[1],[2]	$ 60,242	$ 60,238
Maximum amount outstanding during the period	[3]	$ 60,244	$ 60,241
Weighted average interest rate during the period	[1],[4]	4.20%	3.30%
Interest rate at end of the period	[5]	4.40%	3.60%

[1] Interim period averages are annualized.

[2] The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period.

[3] The maximum amount outstanding at any month-end during the period.

[4] The weighted average interest rate during the period was computed by dividing the actual interest expense (annualized for interim periods) by the average amount outstanding during the period. The weighted average interest rate on the FHLB borrowings includes the effect of interest rate swaps.

[5] Stated rate.

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Borrowings Maturities Table (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Less than 1 Year	$ 167,093
1-2 Years	385,552
2-3 Years	11,537
3-4 Years	0
4-5 Years	0
Thereafter	164,670
Total	728,852
Federal funds purchased and repurchase agreements:
Debt Instrument [Line Items]
Less than 1 Year	8,588
1-2 Years	387
2-3 Years	0
3-4 Years	0
4-5 Years	0
Thereafter	0
Total	8,975
FHLB borrowings:
Debt Instrument [Line Items]
Less than 1 Year	158,505
1-2 Years	385,165
2-3 Years	11,537
3-4 Years	0
4-5 Years	0
Thereafter	6,060
Total	561,267
Subordinated notes, net of unamortized debt issuance costs:
Debt Instrument [Line Items]
Less than 1 Year	0
1-2 Years	0
2-3 Years	0
3-4 Years	0
4-5 Years	0
Thereafter	98,366
Total	98,366
Trust preferred subordinated debentures, net of unamortized debt issuance costs:
Debt Instrument [Line Items]
Less than 1 Year	0
1-2 Years	0
2-3 Years	0
3-4 Years	0
4-5 Years	0
Thereafter	60,244
Total	$ 60,244

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Borrowing Arrangements Narrative (Details)	3 Months Ended	9 Months Ended
	Mar. 31, 2017 USD ($) contract	Sep. 30, 2018 USD ($) credit_line agreement Oustanding_Letters_of_Credit Rate	Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
FHLB borrowings with variable interest rate, face amount		$ 270,000,000
Number of credit lines maintained by the Company | credit_line		3
Federal funds purchased		$ 0	$ 0
Number of outstanding letters of credit | Oustanding_Letters_of_Credit		1
Letters of credit outstanding, amount		$ 195,000
FHLB borrowings, additional funding available		1,250,000,000
Letters of Credit, FHLB, as collateral		0
Securities sold under agreements to repurchase		$ 9,000,000	9,500,000
Maturity of repurchase agreements		2 years
Frost Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity		$ 40,000,000
Line of credit, capacity available for issuance of letters of credit		5,000,000
TIB - The Independent Bankers Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity		15,000,000
Comerica Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity		$ 7,500,000
Minimum
Line of Credit Facility [Line Items]
FHLB borrowings interest rates		1.37%
FHLB borrowings maturities		1 day
Maximum
Line of Credit Facility [Line Items]
FHLB borrowings interest rates		4.799%
FHLB borrowings maturities		9 years 10 months
Variable Rate Advance Agreements
Line of Credit Facility [Line Items]
FHLB borrowings with variable interest rate, face amount		$ 310,000,000	$ 280,000,000
Three-Month London Interbank Offered Rate (LIBOR) | Variable Rate Advance Agreements
Line of Credit Facility [Line Items]
FHLB borrowings, description of variable rate basis		three-month LIBOR
Three-Month London Interbank Offered Rate (LIBOR) | Variable Rate Advance Agreements | Minimum
Line of Credit Facility [Line Items]
Debt Instrument, Number Of Variable Rate Advance Agreements | agreement		1
FHLB borrowings, basis spread on variable rate | Rate		(0.003%)
Three-Month London Interbank Offered Rate (LIBOR) | Variable Rate Advance Agreements | Maximum
Line of Credit Facility [Line Items]
Debt Instrument, Number Of Variable Rate Advance Agreements | agreement		2
FHLB borrowings, basis spread on variable rate | Rate		0.021%
One-Month London Interbank Offered Rate (LIBOR) | Variable Rate Advance Agreements
Line of Credit Facility [Line Items]
FHLB borrowings, description of variable rate basis		one-month LIBOR
One-Month London Interbank Offered Rate (LIBOR) | Variable Rate Advance Agreements | Minimum
Line of Credit Facility [Line Items]
FHLB borrowings, basis spread on variable rate | Rate		0.072%
One-Month London Interbank Offered Rate (LIBOR) | Variable Rate Advance Agreements | Maximum
Line of Credit Facility [Line Items]
FHLB borrowings, basis spread on variable rate | Rate		0.164%
Interest rate swap derivatives
Line of Credit Facility [Line Items]
Derivative, instruments terminated | contract	2
Derivative, terminated, notional amount	$ 40,000,000
Interest rate swap derivatives | Minimum
Line of Credit Facility [Line Items]
Derivative, fixed interest rate		0.932%
Derivative, term of contract		4 years
Interest rate swap derivatives | Maximum
Line of Credit Facility [Line Items]
Derivative, fixed interest rate		2.8325%
Derivative, term of contract		10 years

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Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 387	$ 349	$ 1,161	$ 1,048
Interest cost	848	901	2,544	2,701
Expected return on assets	(1,621)	(1,513)	(4,863)	(4,538)
Net loss amortization	378	328	1,134	984
Prior service (credit) cost amortization	(3)	(3)	(10)	(10)
Net periodic benefit cost (income)	(11)	62	(34)	185
Defined Benefit Pension Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	41	44	123	133
Expected return on assets	(73)	(53)	(218)	(160)
Net loss amortization	0	0	0	0
Prior service (credit) cost amortization	0	0	0	0
Net periodic benefit cost (income)	(32)	(9)	(95)	(27)
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	73	61	220	185
Interest cost	149	142	447	425
Expected return on assets	0	0	0	0
Net loss amortization	169	75	508	226
Prior service (credit) cost amortization	2	2	5	5
Net periodic benefit cost (income)	$ 393	$ 280	$ 1,180	$ 841

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Employee Benefit Plans Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by Employer	$ 2,000
Defined Benefit Pension Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Contributions by Employer	$ 500

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Share-based Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Incentive Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved and available for issuance (in shares)	2,460,000		2,460,000
Shares remaining available for grant for future awards (in shares)	1,687,830		1,687,830
Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares (in shares)	410,000		410,000
Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 661	$ 480	$ 1,626	$ 1,393
Incentive Plan | Nonqualified Stock Options (NQSO)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)			356,849	0
Weighted average exercise price (in dollars per share)			$ 34.52
Awards contractual term			10 years
Incentive Plan | Nonqualified Stock Options (NQSO) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period			3 years
Incentive Plan | Nonqualified Stock Options (NQSO) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period			4 years
Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)			52,148	3,707
Fair value of shares granted			$ 1,800	$ 125
Share-based Compensation Award, Tranche One | Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period			1 year
Share-based Compensation Award, Tranche Two | Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period			3 years
Share-based Compensation Award, Tranche Three | Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period			4 years

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Share-based Incentive Plans - Schedule of Shares Issued in Connection With Stock Compensation Awards (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares issued (in shares)	65,918	77,957	128,969	138,035
Proceeds from stock option exercises	$ 1,571	$ 1,505	$ 2,655	$ 2,527
New shares issued from available authorized shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares issued (in shares)	0	0	0	48,311
New shares issued from available treasury shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares issued (in shares)	65,918	77,957	128,969	89,724

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Derivative Financial Instruments and Hedging Activities - Narrative (Details)	3 Months Ended
	Mar. 31, 2017 contract	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Debt instrument, face amount		$ 270,000,000
Cash collateral received from counterparties under master netting agreements		18,017,000	$ 7,900,000
Interest Rate Swap
Derivative [Line Items]
Derivative, instruments terminated | contract	2
Available-for-sale Securities [Member] | Fixed rate callable securities
Derivative [Line Items]
Hedged asset, fair value hedge		$ 23,300,000

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Derivative Financial Instruments and Hedging Activities - Schedule Of Derivative Instruments (Details) - USD ($)		Sep. 30, 2018	Dec. 31, 2017
Asset Derivative
Gross derivatives		$ 18,631,000	$ 8,626,000
Offsetting derivative assets		(307,000)	(114,000)
Cash collateral received/posted		(18,017,000)	(7,900,000)
Net derivatives included in the consolidated balance sheets	[1]	307,000	612,000
Liability Derivative
Gross derivatives		3,564,000	726,000
Offsetting derivative liabilities		(307,000)	(114,000)
Cash collateral received/posted		0	(520,000)
Net derivatives included in the consolidated balance sheets	[1]	3,257,000	92,000
Financial Institution Counterparties
Liability Derivative
Net credit exposure		0	30,000
Financial Institution Counterparties | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional Amount	[2]	270,000,000	240,000,000
Asset Derivative
Gross derivatives		14,965,000	7,922,000
Liability Derivative
Gross derivatives		0	22,000
Financial Institution Counterparties | Designated as Hedging Instrument | Fair Value Hedging [Member] | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional Amount	[2]	21,100,000	0
Asset Derivative
Gross derivatives		102,000	0
Liability Derivative
Gross derivatives		0	0
Financial Institution Counterparties | Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional Amount	[2]	94,679,000	67,220,000
Asset Derivative
Gross derivatives		3,257,000	92,000
Liability Derivative
Gross derivatives		307,000	612,000
Customer Counterparties
Liability Derivative
Net credit exposure		307,000	612,000
Customer Counterparties | Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional Amount	[2]	94,679,000	67,220,000
Asset Derivative
Gross derivatives		307,000	612,000
Liability Derivative
Gross derivatives		$ 3,257,000	$ 92,000

[1] Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and $307,000 related to interest rate swaps with customers at September 30, 2018. We had net credit exposure of $30,000 related to interest rate swaps with financial institutions and $612,000 related to interest rate swaps with customers at December 31, 2017. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.

[2] Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

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Derivative Financial Instruments and Hedging Activities - Weighted Average Remaining Maturity, Lives, and Rates of Interest Rate Swaps (Details) - Interest Rate Swap - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Financial Institution Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	[1]	$ 94,679	$ 67,220
Remaining Maturity (in years)		12 years 1 month 21 days	12 years 8 months 24 days
Weighted Average Receive Rate		2.12%	1.39%
Weighted Average Pay Rate		2.58%	2.37%
Financial Institution Counterparties | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	[1]	$ 270,000	$ 240,000
Remaining Maturity (in years)		5 years 28 days	5 years 3 months
Weighted Average Receive Rate		2.18%	1.44%
Weighted Average Pay Rate		1.58%	1.43%
Financial Institution Counterparties | Fair Value Hedging [Member] | Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	[1]	$ 21,100	$ 0
Remaining Maturity (in years)		7 years 9 months 2 days	0 years
Weighted Average Receive Rate		2.34%	0.00%
Weighted Average Pay Rate		3.00%	0.00%
Customer Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	[1]	$ 94,679	$ 67,220
Remaining Maturity (in years)		12 years 1 month 21 days	12 years 8 months 24 days
Weighted Average Receive Rate		2.58%	2.37%
Weighted Average Pay Rate		2.12%	1.39%

[1] Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

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Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		$ 1,939,277
Securities available for sale, at estimated fair value			$ 1,538,755
Derivative assets	[1]	307	612
Derivative liabilities	[1]	3,257	92
U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		19,748
US Government Agency Debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value			108,869
State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		699,069
Securities available for sale, at estimated fair value			392,664
Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		3,027
Securities available for sale, at estimated fair value			5,055
Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[2]	687,598
Securities available for sale, at estimated fair value	[2]		718,029
Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[2]	529,835
Securities available for sale, at estimated fair value	[2]		308,218
Equity Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[3]		5,920
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments	[4]	5,735
Total asset fair value measurements		1,963,643	1,547,381
Total liability fair value measurements		3,564	726
Fair Value, Measurements, Recurring [Member] | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		19,748
Fair Value, Measurements, Recurring [Member] | US Government Agency Debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value			108,869
Fair Value, Measurements, Recurring [Member] | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		699,069
Securities available for sale, at estimated fair value			392,664
Fair Value, Measurements, Recurring [Member] | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		3,027
Securities available for sale, at estimated fair value			5,055
Fair Value, Measurements, Recurring [Member] | Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[5]	687,598
Securities available for sale, at estimated fair value	[5]		718,029
Fair Value, Measurements, Recurring [Member] | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[5]	529,835
Securities available for sale, at estimated fair value	[5]		308,218
Fair Value, Measurements, Recurring [Member] | Equity Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[4]		5,920
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		18,631	8,626
Derivative liabilities		3,564	726
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments	[4]	5,735
Total asset fair value measurements		25,483	5,920
Total liability fair value measurements		0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		19,748
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Government Agency Debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value			0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		0
Securities available for sale, at estimated fair value			0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		0
Securities available for sale, at estimated fair value			0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[5]	0
Securities available for sale, at estimated fair value	[5]		0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[5]	0
Securities available for sale, at estimated fair value	[5]		0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[4]		5,920
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments	[4]	0
Total asset fair value measurements		1,938,160	1,541,461
Total liability fair value measurements		3,564	726
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | US Government Agency Debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value			108,869
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		699,069
Securities available for sale, at estimated fair value			392,664
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		3,027
Securities available for sale, at estimated fair value			5,055
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[5]	687,598
Securities available for sale, at estimated fair value	[5]		718,029
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[5]	529,835
Securities available for sale, at estimated fair value	[5]		308,218
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Equity Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[4]		0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		18,631	8,626
Derivative liabilities		3,564	726
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments	[4]	0
Total asset fair value measurements		0	0
Total liability fair value measurements		0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | US Government Agency Debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value			0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		0
Securities available for sale, at estimated fair value			0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		0
Securities available for sale, at estimated fair value			0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[5]	0
Securities available for sale, at estimated fair value	[5]		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[5]	0
Securities available for sale, at estimated fair value	[5]		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Equity Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[4]		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets		1,413	1,767
Impaired loans	[6]	33,280	6,536
Total asset fair value measurements		34,693	8,303
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets		0	0
Impaired loans	[6]	0	0
Total asset fair value measurements		0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets		0	0
Impaired loans	[6]	0	0
Total asset fair value measurements		0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets		1,413	1,767
Impaired loans	[6]	33,280	6,536
Total asset fair value measurements		$ 34,693	$ 8,303

[1] Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and $307,000 related to interest rate swaps with customers at September 30, 2018. We had net credit exposure of $30,000 related to interest rate swaps with financial institutions and $612,000 related to interest rate swaps with customers at December 31, 2017. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.

[2] All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

[3] See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

[4] With the adoption of ASU 2016-01 on January 1, 2018, these investments are included in equity investments on our consolidated balance sheets. The guidance was applied on a prospective approach resulting in prior-periods no longer being comparable. See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.

[5] All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

[6] Impaired loans represent collateral-dependent loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.

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Fair Value Measurement - Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Carrying Amount
Financial Assets:
Cash and cash equivalents	$ 174,072	$ 198,692
Investment Securities:
Held to maturity, at carrying value	3,087	413,632
Mortgage-backed Securities:
Held to maturity, at carrying value	160,278	495,874
FHLB stock, at cost	32,291	55,729
Equity investments	6,294	5,821
Loans, net of allowance for loan losses	3,248,432	3,273,575
Loans held for sale	954	2,001
Financial Liabilities:
Deposits	4,553,512	4,515,447
Federal funds purchased and repurchase agreements	8,975	9,498
FHLB borrowings	561,267	1,017,361
Subordinated notes, net of unamortized debt issuance costs	98,366	98,248
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,244	60,241
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	174,072	198,692
Investment Securities:
Held to maturity, at carrying value	3,030	421,928
Mortgage-backed Securities:
Held to maturity, at carrying value	153,442	499,872
FHLB stock, at cost	32,291	55,729
Equity investments	6,294	5,821
Loans, net of allowance for loan losses	3,179,049	3,269,316
Loans held for sale	954	2,001
Financial Liabilities:
Deposits	4,543,794	4,506,133
Federal funds purchased and repurchase agreements	8,975	9,498
FHLB borrowings	542,846	1,008,292
Subordinated notes, net of unamortized debt issuance costs	97,979	99,665
Trust preferred subordinated debentures, net of unamortized debt issuance costs	51,014	47,622
Estimated Fair Value | Level 1
Financial Assets:
Cash and cash equivalents	174,072	198,692
Investment Securities:
Held to maturity, at carrying value	0	0
Mortgage-backed Securities:
Held to maturity, at carrying value	0	0
FHLB stock, at cost	0	0
Equity investments	0	0
Loans, net of allowance for loan losses	0	0
Loans held for sale	0	0
Financial Liabilities:
Deposits	0	0
Federal funds purchased and repurchase agreements	0	0
FHLB borrowings	0	0
Subordinated notes, net of unamortized debt issuance costs	0	0
Trust preferred subordinated debentures, net of unamortized debt issuance costs	0	0
Estimated Fair Value | Level 2
Financial Assets:
Cash and cash equivalents	0	0
Investment Securities:
Held to maturity, at carrying value	3,030	421,928
Mortgage-backed Securities:
Held to maturity, at carrying value	153,442	499,872
FHLB stock, at cost	32,291	55,729
Equity investments	6,294	5,821
Loans, net of allowance for loan losses	0	0
Loans held for sale	954	2,001
Financial Liabilities:
Deposits	4,543,794	4,506,133
Federal funds purchased and repurchase agreements	8,975	9,498
FHLB borrowings	542,846	1,008,292
Subordinated notes, net of unamortized debt issuance costs	97,979	99,665
Trust preferred subordinated debentures, net of unamortized debt issuance costs	51,014	47,622
Estimated Fair Value | Level 3
Financial Assets:
Cash and cash equivalents	0	0
Investment Securities:
Held to maturity, at carrying value	0	0
Mortgage-backed Securities:
Held to maturity, at carrying value	0	0
FHLB stock, at cost	0	0
Equity investments	0	0
Loans, net of allowance for loan losses	3,179,049	3,269,316
Loans held for sale	0	0
Financial Liabilities:
Deposits	0	0
Federal funds purchased and repurchase agreements	0	0
FHLB borrowings	0	0
Subordinated notes, net of unamortized debt issuance costs	0	0
Trust preferred subordinated debentures, net of unamortized debt issuance costs	$ 0	$ 0

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Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Current income tax expense	$ 95	$ 3,454	$ 3,107	$ 9,798
Deferred income tax expense	2,097	436	4,535	453
Income tax expense	$ 2,192	$ 3,890	$ 7,642	$ 10,251

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Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Benefit, Adjustment	$ 800,000		$ 800,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	2,200,000		2,200,000
Net deferred tax assets	16,400,000		16,400,000		$ 12,200,000
Deferred tax assets, valuation allowance	0		0		$ 0
Income tax expense	$ 2,192,000	$ 3,890,000	$ 7,642,000	$ 10,251,000
Effective income tax rate, percent	9.70%	21.10%	11.90%	18.90%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	3.60%		1.20%

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Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 847,453	$ 819,605
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	819,256	804,715
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 28,197	$ 14,890

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Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Securities:
Unsettled trades to purchase securities	$ 28,662,000	$ 0	$ 16,673,000
Unsettled trades to sell securities	14,602,000	0	11,843,000
Deposits:
Unsettled Issuances of Brokered CDs	$ 10,000,000	$ 0	$ 0