10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended March 31, 2021

OR

☐ 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: 000-12247

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)

Securities Registered Pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, $1.25 par value	SBSI	NASDAQ Global Select Market

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 ☒     No ☐

Indicate by check mark whether the registrant has submitted electronically 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 such files).  Yes  ☒    No  ☐

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	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐
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. ☐

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

The number of shares of the issuer’s common stock, par value $1.25, outstanding as of April 27, 2021 was 32,588,244 shares.

TABLE OF CONTENTS

GLOSSARY OF ACRONYMS, ABBREVIATIONS AND TERMS	1
PART I.  FINANCIAL INFORMATION
ITEM 1.  FINANCIAL STATEMENTS	3
ITEM 2.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	40
ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	65
ITEM 4.  CONTROLS AND PROCEDURES	67
PART II.  OTHER INFORMATION
ITEM 1.  LEGAL PROCEEDINGS	67
ITEM 1A.  RISK FACTORS	67
ITEM 2.  UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	67
ITEM 3.  DEFAULTS UPON SENIOR SECURITIES	68
ITEM 4.  MINE SAFETY DISCLOSURES	68
ITEM 5.  OTHER INFORMATION	68
ITEM 6.  EXHIBITS	69
EXHIBIT INDEX	69
SIGNATURES	70

SOUTHSIDE BANCSHARES, INC.

Glossary of Acronyms, Abbreviations and Terms

The acronyms, abbreviations and terms listed below are used in various sections of this Form 10-Q, including "Item 1. Financial Statements" and "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."

Entities:
Southside Bancshares, Inc.	Bank holding company for Southside Bank
Southside Bank	Texas state bank and wholly owned subsidiary of Southside Bancshares, Inc.
Company	Combined entities of Southside Bancshares, Inc. and its subsidiaries, including Southside Bank
Bank	Southside Bank
Southside	Southside Bancshares, Inc.
Other Acronyms, Abbreviations and Terms:
2020 Form 10-K	Company’s Annual Report on Form 10-K for the year ended December 31, 2020
AFS	Available for sale
ALCO	Asset/Liability Committee
AOCI	Accumulated other comprehensive income or loss
ASC	Accounting Standards Codification
ASU	Accounting Standards Update issued by the FASB
ATM	Automated teller machines
Basel Committee	Basel Committee on Banking Supervision
BOLI	Bank owned life insurance
CARES Act	Coronavirus Aid, Relief, and Economic Security Act
CDs	Certificates of deposit
CECL	ASU No. 2016-13, Financial Instruments- Credit Losses, also known as Current Expected Credit Losses
CET1	Common Equity Tier 1
CMOs	Collateralized mortgage obligations
COVID-19	Novel strain of coronavirus
Dodd-Frank Act	Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010
Economic Aid Act	Economic Aid to Hard-Hit Small Business, Nonprofits and Venues Act
ESOP	Employee Stock Ownership Plan
ETR	Effective tax rate
Exchange Act	Securities Exchange Act of 1934
FASB	Financial Accounting Standards Board
FDIC	Federal Deposit Insurance Corporation
Federal Reserve	The Board of Governors of the Federal Reserve System
FHLB	Federal Home Loan Bank
FRBNY	Federal Reserve Bank of New York
FRDW	Federal Reserve Discount Window
FTE	Fully-taxable equivalents measurements
GAAP	Generally accepted accounting principles
GSEs	U.S. government-sponsored enterprises
Guidelines	Interagency Guidelines Prescribing Standards for Safety and Soundness adopted by federal banking agencies
HTM	Held to maturity

Southside Bancshares, Inc. |1

ITM	Interactive teller machines
LIBOR	London Interbank Offered Rate
MBS	Mortgage-backed securities
MVPE	Market value of portfolio equity
OREO	Other real estate owned
PCD	Purchased financial assets with credit deterioration under CECL
PCI	Financial assets purchased credit impaired under ASC 310-30 prior to CECL
PPP	Paycheck Protection Program
PPP Facility	Paycheck Protection Program Lending Facility
Repurchase agreements	Securities sold under agreements to repurchase
Restoration Plan	Nonfunded supplemental retirement plan
ROU	Right-of-use
SBA	Small Business Administration
SEC	Securities and Exchange Commission
SOFR	Secured Overnight Financing Rate provided by the Federal Reserve Bank of New York
TDR	Troubled debt restructurings
U.S.	United States

Southside Bancshares, Inc. |2

PART I.   FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS

(UNAUDITED)
(in thousands, except share amounts)

	March 31, 2021		December 31, 2020
ASSETS
Cash and due from banks	$	78,304	$	87,357
Interest earning deposits	29,319		21,051
Total cash and cash equivalents	107,623		108,408
Securities:
Securities AFS, at estimated fair value (amortized cost of $2,448,113 and $2,437,513, respectively)	2,546,924		2,587,305
Securities HTM (estimated fair value of $104,177 and $118,198, respectively)	98,159		108,998
FHLB stock, at cost	18,754		25,259
Equity investments	11,804		11,905
Loans held for sale	2,615		3,695
Loans:
Loans	3,716,598		3,657,779
Less:  Allowance for loan losses	(41,454)		(49,006)
Net loans	3,675,144		3,608,773
Premises and equipment, net	144,628		144,576
Operating lease ROU assets	15,788		15,063
Goodwill	201,116		201,116
Other intangible assets, net	8,978		9,744
Interest receivable	27,438		38,708
BOLI	116,209		115,583
Other assets	23,706		29,094
Total assets	$	6,998,886	$	7,008,227
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposits:
Noninterest bearing	$	1,383,371	$	1,354,815
Interest bearing	3,709,272		3,577,507
Total deposits	5,092,643		4,932,322
Other borrowings	22,315		23,172
FHLB borrowings	665,530		832,527
Subordinated notes, net of unamortized debt issuance costs	197,268		197,251
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,256		60,255
Deferred tax liability, net	9,869		15,549
Unsettled trades to purchase securities	23,473		—
Operating lease liabilities	17,327		16,734
Other liabilities	51,608		55,120
Total liabilities	6,140,289		6,132,930
Off-balance-sheet arrangements, commitments and contingencies (Note 12)
Shareholders’ equity:
Common stock:  ($1.25 par value, 80,000,000 shares authorized, 37,943,737 shares issued at March 31, 2021 and 37,934,819 shares issued at December 31, 2020)	47,430		47,419
Paid-in capital	774,815		771,511
Retained earnings	134,782		111,208
Treasury stock: (shares at cost, 5,284,781 at March 31, 2021 and 4,983,645 at December 31, 2020)	(138,016)		(123,921)
AOCI	39,586		69,080
Total shareholders’ equity	858,597		875,297
Total liabilities and shareholders’ equity	$	6,998,886	$	7,008,227

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

Southside Bancshares, Inc. |3

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

(in thousands, except per share data)

	Three Months Ended
	March 31,
	2021		2020
Interest income:
Loans	$	36,038	$	41,895
Taxable investment securities	2,323		512
Tax-exempt investment securities	8,965		6,206
MBS	6,088		11,534
FHLB stock and equity investments	136		425
Other interest earning assets	15		180
Total interest income	53,565		60,752
Interest expense:
Deposits	2,597		9,919
FHLB borrowings	1,908		3,974
Subordinated notes	2,395		1,411
Trust preferred subordinated debentures	351		600
Other borrowings	11		147
Total interest expense	7,262		16,051
Net interest income	46,303		44,701
Provision for credit losses	(10,149)		25,247
Net interest income after provision for credit losses	56,452		19,454
Noninterest income:
Deposit services	6,125		6,279
Net gain on sale of securities AFS	2,003		5,541
Gain on sale of loans	593		170
Trust fees	1,383		1,305
BOLI	626		569
Brokerage services	780		580
Other	2,113		1,054
Total noninterest income	13,623		15,498
Noninterest expense:
Salaries and employee benefits	20,044		19,643
Net occupancy	3,560		3,311
Advertising, travel & entertainment	437		832
ATM expense	238		224
Professional fees	991		1,195
Software and data processing	1,312		1,227
Communications	525		493
FDIC insurance	454		25
Amortization of intangibles	766		980
Other	2,907		2,590
Total noninterest expense	31,234		30,520
Income before income tax expense	38,841		4,432
Income tax expense	4,750		479
Net income	$	34,091	$	3,953
Earnings per common share – basic	$	1.04	$	0.12
Earnings per common share – diluted	$	1.04	$	0.12
Cash dividends paid per common share	$	0.32	$	0.31

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

Southside Bancshares, Inc. |4

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

(in thousands)

	Three Months Ended
	March 31,
	2021		2020
Net income	$	34,091	$	3,953
Other comprehensive income (loss):
Securities AFS and transferred securities:
Change in unrealized holding (loss) gain on AFS securities during the period	(48,979)		61,486
Reclassification adjustment for amortization related to AFS and HTM debt securities	416		121
Reclassification adjustment for net gain on sale of AFS securities, included in net income	(2,003)		(5,541)
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	11,023		(19,600)
Reclassification adjustment of net loss (gain) related to derivatives designated as cash flow hedges	1,568		(101)
Pension plans:
Amortization of net actuarial loss and prior service credit, included in net periodic benefit cost	641		727
Other comprehensive (loss) income, before tax	(37,334)		37,092
Income tax benefit (expense) related to items of other comprehensive (loss) income	7,840		(7,789)
Other comprehensive (loss) income, net of tax	(29,494)		29,303
Comprehensive income	$	4,597	$	33,256

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

Southside Bancshares, Inc. |5

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, 2020	$	47,419	$	771,511	$	111,208	$	(123,921)	$	69,080	$	875,297
Net income	—		—		34,091		—		—		34,091
Other comprehensive loss	—		—		—		—		(29,494)		(29,494)
Issuance of common stock for dividend reinvestment plan (8,918 shares)	11		321		—		—		—		332
Purchase of common stock (427,396 shares)	—		—		—		(15,213)		—		(15,213)
Stock compensation expense	—		674		—		—		—		674
Net issuance of common stock under employee stock plans (126,260 shares)	—		2,309		(41)		1,118		—		3,386
Cash dividends paid on common stock ($0.32 per share)	—		—		(10,476)		—		—		(10,476)
Balance at March 31, 2021	$	47,430	$	774,815	$	134,782	$	(138,016)	$	39,586	$	858,597

Balance at December 31, 2019	$	47,360	$	766,718	$	80,274	$	(94,008)	$	4,236	$	804,580
Cumulative effect of accounting change	—		—		(7,830)		—		—		(7,830)
Adjusted beginning balance	47,360		766,718		72,444		(94,008)		4,236		796,750
Net income	—		—		3,953		—		—		3,953
Other comprehensive income	—		—		—		—		29,303		29,303
Issuance of common stock for dividend reinvestment plan (10,607 shares)	13		334		—		—		—		347
Purchase of common stock (869,723 shares)	—		—		—		(25,842)		—		(25,842)
Stock compensation expense	—		695		—		—		—		695
Net issuance of common stock under employee stock plans (47,428 shares)	—		693		(40)		435		—		1,088
Cash dividends paid on common stock ($0.31 per share)	—		—		(10,494)		—		—		(10,494)
Balance at March 31, 2020	$	47,373	$	768,440	$	65,863	$	(119,415)	$	33,539	$	795,800

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

Southside Bancshares, Inc. |6

SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

(in thousands)

	Three Months Ended
	March 31,
	2021		2020
OPERATING ACTIVITIES:
Net income	$	34,091	$	3,953
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	2,882		3,021
Securities premium amortization (discount accretion), net	6,083		4,505
Loan (discount accretion) premium amortization, net	(223)		(244)
Provision for credit losses	(10,149)		25,247
Stock compensation expense	674		695
Deferred tax expense (benefit)	2,161		(5,075)
Net gain on sale of AFS securities	(2,003)		(5,541)
Net (gain) loss on premises and equipment	227		(42)
Gross proceeds from sales of loans held for sale	15,987		5,204
Gross originations of loans held for sale	(14,907)		(6,651)
Net (gain) loss on OREO	(2)		1
Net change in:
Interest receivable	11,270		1,383
Other assets	6,459		(9,318)
Interest payable	(1,026)		(2,034)
Other liabilities	10,891		(18,886)
Net cash provided by (used in) operating activities	62,415		(3,782)
INVESTING ACTIVITIES:
Securities AFS:
Purchases	(127,713)		(683,062)
Sales	37,097		135,000
Maturities, calls and principal repayments	99,787		80,555
Securities HTM:
Maturities, calls and principal repayments	10,871		352
Proceeds from redemption of FHLB stock and equity investments	16,240		—
Purchases of FHLB stock and equity investments	(9,629)		(4,661)
Net loan originations	(59,211)		(33,207)
Purchases of premises and equipment	(2,396)		(4,259)
Proceeds from sales of premises and equipment	94		72
Proceeds from sales of OREO	106		46
Proceeds from sales of repossessed assets	44		31
Net cash used in investing activities	(34,710)		(509,133)
(continued)

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SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (continued)
(UNAUDITED)
(in thousands)
	Three Months Ended
	March 31,
	2021		2020
FINANCING ACTIVITIES:
Net change in deposits	$	160,308	$	56,281
Net change in other borrowings	(857)		189,542
Proceeds from FHLB borrowings	4,009,977		3,247,401
Repayment of FHLB borrowings	(4,176,974)		(2,945,775)
Net proceeds from issuance of subordinated long-term debt	(59)		—
Proceeds from stock option exercises	3,412		1,130
Cash paid to tax authority related to tax withholding on share-based awards	(26)		(42)
Purchase of common stock	(14,127)		(23,959)
Proceeds from the issuance of common stock for dividend reinvestment plan	332		347
Cash dividends paid	(10,476)		(10,494)
Net cash (used in) provided by financing activities	(28,490)		514,431
Net (decrease) increase in cash and cash equivalents	(785)		1,516
Cash and cash equivalents at beginning of period	108,408		110,697
Cash and cash equivalents at end of period	$	107,623	$	112,213
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	$	8,288	$	18,085
Income taxes paid	$	250	$	—
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	$	424	$	338
Unsettled trades to purchase securities	$	(23,473)	$	(14,596)
Unsettled trades to sell securities	$	—	$	67,247
Unsettled trades to repurchase common stock	$	(1,086)	$	(1,883)

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

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SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

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, including Southside Bank.  The words “Southside” and “Southside Bancshares” refer to Southside Bancshares, Inc.  The words “Southside Bank” and “the Bank” refer to Southside Bank.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. 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, 2020. 

Accounting Changes and Reclassifications

Certain prior period amounts may be reclassified to conform to current year presentation.

Accounting Pronouncements

In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” ASU 2020-04 is intended to provide relief for companies preparing for discontinuation of interest rates based on LIBOR. The ASU provides optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or other reference rates expected to be discontinued. ASU 2020-04 also provides for a one-time sale and/or transfer to AFS or trading to be made for HTM debt securities that both reference an eligible reference rate and were classified as HTM before January 1, 2020. ASU 2020-04 was effective for all entities as of March 12, 2020 and through December 31, 2022. Companies can apply the ASU as of the beginning of the interim period that includes March 12, 2020 or any date thereafter. The guidance requires companies to apply the guidance prospectively to contract modifications and hedging relationships while the one-time election to sell and/or transfer debt securities classified as HTM may be made any time after March 12, 2020. We have established an officer level committee to guide our transition from LIBOR and have begun efforts to transition to alternative rates consistent with industry timelines. We have identified products that utilize LIBOR and are implementing enhanced fallback language to facilitate the transition to alternative reference rates. We are evaluating existing systems and have begun offering new rates on a limited basis. ASU 2020-04 is not expected to have a material impact on our consolidated financial statements.

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2.     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 March 31,
	2021		2020
Basic and Diluted Earnings:
Net income	$	34,091	$	3,953
Basic weighted-average shares outstanding	32,829		33,691
Add:  Stock awards	108		114
Diluted weighted-average shares outstanding	32,937		33,805
Basic earnings per share:
Net income	$	1.04	$	0.12
Diluted earnings per share:
Net income	$	1.04	$	0.12

For the three months ended March 31, 2021, and 2020 there were approximately 679,000 and 775,000 anti-dilutive shares, respectively.

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3.     Accumulated Other Comprehensive Income (Loss)

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

	Three Months Ended March 31, 2021
					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	$	116,078	$	(17,091)	$	149	$	(30,056)	$	69,080
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(48,979)		11,023		—		—		(37,956)
Reclassification adjustments included in net income	(1,587)		1,568		—		641		622
Income tax benefit (expense)	10,619		(2,644)		—		(135)		7,840
Net current-period other comprehensive (loss) income, net of tax	(39,947)		9,947		—		506		(29,494)
Ending balance, net of tax	$	76,131	$	(7,144)	$	149	$	(29,550)	$	39,586

	Three Months Ended March 31, 2020
					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	$	38,038	$	(1,672)	$	(145)	$	(31,985)	$	4,236
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	61,486		(19,600)		—		—		41,886
Reclassification adjustments included in net income	(5,420)		(101)		(1)		728		(4,794)
Income tax (expense) benefit	(11,774)		4,137		—		(152)		(7,789)
Net current-period other comprehensive income (loss), net of tax	44,292		(15,564)		(1)		576		29,303
Ending balance, net of tax	$	82,330	$	(17,236)	$	(146)	$	(31,409)	$	33,539

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The reclassification adjustments out of accumulated other comprehensive income (loss) included in net income are presented below (in thousands):

	Three Months Ended March 31,
	2021		2020
Unrealized gains and losses on securities transferred:
Amortization of unrealized gains and losses (1)	$	(416)	$	(121)
Tax benefit	87		25
Net of tax	(329)		(96)
Unrealized gains and losses on available for sale securities:
Realized net gain on sale of securities (2)	2,003		5,541
Tax expense	(420)		(1,164)
Net of tax	1,583		4,377
Derivatives:
Realized net (loss) gain on interest rate swap derivatives (3)	(1,568)		93
Tax benefit (expense)	329		(19)
Net of tax	(1,239)		74
Amortization of unrealized gains on terminated interest rate swap derivatives (3)	—		8
Tax expense	—		(1)
Net of tax	—		7
Amortization of pension plan:
Net actuarial loss (4)	(641)		(728)
Prior service credit (4)	—		1
Total before tax	(641)		(727)
Tax benefit	135		152
Net of tax	(506)		(575)
Total reclassifications for the period, net of tax	$	(491)	$	3,787

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

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

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

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

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4.     Securities

Debt securities

The amortized cost, gross unrealized gains and losses and estimated fair value of investment and mortgage-backed AFS and HTM securities as of March 31, 2021 and December 31, 2020 are reflected in the tables below (in thousands):

	March 31, 2021
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
U.S. Treasury	$	42,818	$	8	$	349	$	42,477
State and political subdivisions	1,528,516		71,813		8,684		1,591,645
Other stocks and bonds	91,439		1,560		216		92,783
MBS: (1)
Residential	675,795		31,580		301		707,074
Commercial	109,545		3,802		402		112,945
Total	$	2,448,113	$	108,763	$	9,952	$	2,546,924
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	908	$	9	$	—	$	917
MBS: (1)
Residential	45,274		3,006		—		48,280
Commercial	51,977		3,003		—		54,980
Total	$	98,159	$	6,018	$	—	$	104,177

	December 31, 2020
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
State and political subdivisions	$	1,475,030	$	105,601	$	37	$	1,580,594
Other stocks and bonds	77,224		1,053		22		78,255
MBS: (1)
Residential	771,409		38,674		73		810,010
Commercial	113,850		4,746		150		118,446
Total	$	2,437,513	$	150,074	$	282	$	2,587,305
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	907	$	13	$	—	$	920
MBS: (1)
Residential	47,948		4,187		—		52,135
Commercial	60,143		5,000		—		65,143
Total	$	108,998	$	9,200	$	—	$	118,198

(1) All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

Investment securities and MBS with carrying values of $1.47 billion and $1.56 billion were pledged as of March 31, 2021 and December 31, 2020, respectively, to collateralize FHLB borrowings, borrowings from the FRDW, repurchase agreements and public fund deposits, for potential liquidity needs or other purposes as required by law.

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The following tables represent the fair value and unrealized losses on AFS investment and MBS for which an allowance for credit losses has not been recorded as of March 31, 2021 and December 31, 2020, segregated by major security type and length of time in a continuous loss position (in thousands):

	March 31, 2021
	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:
U.S. Treasury	$	23,599	$	349	$	—	$	—	$	23,599	$	349
State and political subdivisions	205,469		8,684		—		—		205,469		8,684
Other stocks and bonds	28,845		216		—		—		28,845		216
MBS:
Residential	7,769		301		—		—		7,769		301
Commercial	4,488		402		—		—		4,488		402
Total	$	270,170	$	9,952	$	—	$	—	$	270,170	$	9,952
	December 31, 2020
	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	$	17,305	$	37	$	—	$	—	$	17,305	$	37
Other stocks and bonds	11,562		22		—		—		11,562		22
MBS:
Residential	6,287		73		—		—		6,287		73
Commercial	4,744		150		—		—		4,744		150
Total	$	39,898	$	282	$	—	$	—	$	39,898	$	282

With the adoption of ASU 2016-13, for those AFS debt securities in an unrealized loss position where management (i) has the intent to sell or (ii) where it will more-likely-than-not be required to sell the security before the recovery of its amortized cost basis, we write the security down to fair value with an adjustment to earnings. For those AFS debt securities in an unrealized loss position that do not meet either of these criteria, management assesses whether the decline in fair value has resulted from credit-related factors, using both qualitative and quantitative criteria. Determining the allowance under the credit loss method requires the use of a discounted cash flow method to assess the credit losses. Any credit-related impairment will be recognized in allowance for credit losses on the balance sheet with a corresponding adjustment to earnings. Noncredit-related impairment, the portion of the impairment relating to factors other than credit (such as changes in market interest rates), is recognized in other comprehensive income, net of tax.

Based on our consideration of the qualitative factors associated with each security type in our AFS portfolio, we did not recognize any unrealized losses in income on our AFS securities during the three months ended March 31, 2021 or 2020. Our state and political subdivisions are highly rated municipal securities with a long history of no credit losses. Our AFS MBS are highly rated securities which are either explicitly or implicitly backed by the U.S. Government through its agencies which are highly rated by major ratings agencies and also have a long history of no credit losses. Our other stocks and bonds as of March 31, 2021 consist of highly rated investment grade bonds. Management does not intend to sell and it is likely we will not be required to sell those securities in an unrealized loss position prior to the anticipated recovery of the amortized cost basis. These unrealized losses on our investment and MBS are largely due to changes in interest rates and spreads and other market conditions impacted by COVID-19. As of March 31, 2021 and December 31, 2020, we did not have an allowance for credit losses on our AFS securities.

We assess the likelihood of default and the potential amount of default when assessing our HTM securities for credit losses. We utilize term structures and, due to no prior loss exposure on our state and political subdivision securities, we currently apply a third-party average loss given default rate to model our securities. Due to a small number of HTM municipal securities in our portfolio as of March 31, 2021 and 2020, we elected to use the specific identification method to model these securities which aligns with our third-party fair value measurement process. The model determined any expected credit loss over the life of these

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securities to be remote. Management further evaluated the remote expectation of loss along with the qualitative factors associated with these securities and concluded that, due to the securities being highly rated municipals with a long history of no credit losses, no credit loss should be recognized for these securities for the three months ended March 31, 2021 or 2020.

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 $2.4 million ($1.9 million, net of tax) at March 31, 2021 and $2.9 million ($2.3 million, net of tax) at December 31, 2020. 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 impairment for each individual security. There were no securities transferred from AFS to HTM during the three months ended March 31, 2021 or the year ended December 31, 2020.

The accrued interest receivable on our debt securities is excluded from the credit loss estimate and is included in interest receivable on our consolidated balance sheets. As of March 31, 2021, accrued interest receivable on AFS and HTM debt securities totaled $13.4 million and $259,000, respectively. As of December 31, 2020, accrued interest receivable on AFS and HTM debt securities totaled $22.0 million and $298,000, respectively. No HTM debt securities were past-due or on nonaccrual status as of March 31, 2021 or December 31, 2020.

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

	Three Months Ended March 31,
	2021		2020
U.S. Treasury	$	37	$	—
State and political subdivisions	10,406		6,625
Other stocks and bonds	845		93
MBS	6,088		11,534
Total interest income on securities	$	17,376	$	18,252

There was a $2.0 million net realized gain from the AFS securities portfolio for the three months ended March 31, 2021, which consisted of $2.1 million in realized gains and $52,000 in realized losses.  There was a $5.5 million net realized gain from the AFS securities portfolio for the three months ended March 31, 2020, which consisted of $5.6 million in realized gains and $10,000 in realized losses. There were no sales from the HTM portfolio during the three months ended March 31, 2021 or 2020.  We calculate realized gains and losses on sales of securities under the specific identification method.

Expected maturities on our securities may differ from contractual maturities because issuers may have the right to call or prepay obligations.  MBS are presented in total by category since MBS are typically issued with stated principal amounts and 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.

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The amortized cost and estimated fair value of AFS and HTM securities at March 31, 2021, are presented below by contractual maturity (in thousands):

	March 31, 2021
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment securities:
Due in one year or less	$	1,036	$	1,061
Due after one year through five years	32,542		33,937
Due after five years through ten years	93,914		96,177
Due after ten years	1,535,281		1,595,730
	1,662,773		1,726,905
MBS:	785,340		820,019
Total	$	2,448,113	$	2,546,924

	March 31, 2021
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment securities:
Due in one year or less	$	120	$	121
Due after one year through five years	509		514
Due after five years through ten years	279		282
Due after ten years	—		—
	908		917
MBS:	97,251		103,260
Total	$	98,159	$	104,177

Equity Investments

Equity investments on our consolidated balance sheets include Community Reinvestment Act funds with a readily determinable fair value as well as equity investments without readily determinable fair values. At March 31, 2021 and December 31, 2020, we had equity investments recorded in our consolidated balance sheets of $11.8 million and $11.9 million, respectively.

Any realized and unrealized gains and losses on equity investments are reported in income. Equity investments without readily determinable fair values are recorded at cost less impairment, if any.

The following is a summary of unrealized and realized gains and losses on equity investments recognized in other noninterest income in the consolidated statements of income during the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Net (losses) gains recognized during the period on equity investments	$	(107)	$	53
Less: Net gains recognized during the period on equity investments sold during the period	—		—
Unrealized (losses) gains recognized during the reporting period on equity investments held at the reporting date	$	(107)	$	53

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 March 31, 2021.

FHLB Stock

Our FHLB stock, which has limited marketability, is carried at cost and is assessed quarterly for other-than-temporary impairment. Based upon evaluation by management at March 31, 2021, our FHLB stock was not impaired and thus was not considered to be other-than-temporarily impaired.

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5.     Loans and Allowance for Loan Losses

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

	March 31, 2021		December 31, 2020
Real estate loans:
Construction	$	605,677	$	581,941
1-4 family residential	700,430		719,952
Commercial	1,348,551		1,295,746
Commercial loans	564,745		557,122
Municipal loans	406,377		409,028
Loans to individuals	90,818		93,990
Total loans	3,716,598		3,657,779
Less: Allowance for loan losses	41,454		49,006
Net loans	$	3,675,144	$	3,608,773

Paycheck Protection Program Loans

In April 2020, we began originating loans to qualified small businesses under the PPP administered by the SBA under the provisions of the CARES Act. Loans covered by the PPP may be eligible for loan forgiveness for certain costs incurred related to payroll, group health care benefit costs and qualifying mortgage, rent and utility payments. The remaining loan balance after forgiveness of any amount is still fully guaranteed by the SBA. On December 27, 2020, the Economic Aid Act was signed into law. This second coronavirus relief package granted additional funds for a new round of PPP loans. Additionally, it expanded the eligibility for loans and allowed certain businesses to request a second loan. In return for processing and booking a PPP loan, the SBA paid lenders a processing fee tiered by the size of the loan. These loans are included in commercial loans with an amortized cost basis at March 31, 2021 and December 31, 2020 of $220.9 million and $214.8 million, respectively.

Construction Real Estate 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 completed 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.

1-4 Family Residential Real Estate 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 March 31, 2021 consisted of $1.25 billion of owner and non-owner occupied real estate, $81.6 million of loans secured by multi-family properties and $15.0 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. 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.  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 make loans to municipalities and school districts primarily throughout the state of Texas, with a small percentage originating outside of the state.  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. Lending money directly to these municipalities allows us to earn a higher yield than we could if we purchased municipal securities for similar durations.

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.

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.

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The following tables set forth the amortized cost basis by class of financing receivable and credit quality indicator for the periods presented (in thousands):

March 31, 2021	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2021		2020		2019		2018		2017		Prior
Construction real estate:
Pass	$	26,255	$	160,527	$	182,708	$	75,258	$	33,261	$	8,877	$	118,479	$	605,365
Pass watch	—		—		—		—		—		22		—		22
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		54		—		54
Doubtful	—		—		—		59		—		177		—		236
Total construction real estate	$	26,255	$	160,527	$	182,708	$	75,317	$	33,261	$	9,130	$	118,479	$	605,677
1-4 family residential real estate:
Pass	$	39,457	$	151,235	$	104,065	$	63,864	$	46,692	$	283,115	$	2,506	$	690,934
Pass watch	—		—		—		—		—		823		—		823
Special mention	—		—		—		—		—		65		—		65
Substandard	10		1,684		—		—		943		5,289		94		8,020
Doubtful	—		14		—		135		34		405		—		588
Total 1-4 family residential real estate	$	39,467	$	152,933	$	104,065	$	63,999	$	47,669	$	289,697	$	2,600	$	700,430
Commercial real estate:
Pass	$	138,805	$	236,874	$	285,638	$	110,462	$	181,077	$	247,524	$	6,857	$	1,207,237
Pass watch	—		—		—		23,272		37,938		5,472		—		66,682
Special mention	24,142		577		8,883		7,002		138		12,245		—		52,987
Substandard	2,105		4,631		—		1,956		63		12,756		—		21,511
Doubtful	—		—		—		—		—		134		—		134
Total commercial real estate	$	165,052	$	242,082	$	294,521	$	142,692	$	219,216	$	278,131	$	6,857	$	1,348,551
Commercial loans:
Pass	$	108,205	$	221,819	$	41,605	$	17,819	$	6,368	$	8,280	$	146,516	$	550,612
Pass watch	43		2,313		1,199		2,004		1,487		—		378		7,424
Special mention	280		—		718		416		36		385		320		2,155
Substandard	185		454		989		481		2		—		1,486		3,597
Doubtful	—		382		95		449		31		—		—		957
Total commercial loans	$	108,713	$	224,968	$	44,606	$	21,169	$	7,924	$	8,665	$	148,700	$	564,745
Municipal loans:
Pass	$	14,748	$	69,822	$	66,741	$	32,166	$	59,756	$	163,144	$	—	$	406,377
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	14,748	$	69,822	$	66,741	$	32,166	$	59,756	$	163,144	$	—	$	406,377
Loans to individuals:
Pass	$	12,798	$	39,592	$	20,715	$	8,079	$	3,672	$	2,079	$	3,521	$	90,456
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		47		—		—		4		51
Substandard	—		19		34		22		27		10		—		112
Doubtful	—		67		—		5		44		83		—		199
Total loans to individuals	$	12,798	$	39,678	$	20,749	$	8,153	$	3,743	$	2,172	$	3,525	$	90,818
Total loans	$	367,033	$	890,010	$	713,390	$	343,496	$	371,569	$	750,939	$	280,161	$	3,716,598

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December 31, 2020	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2020		2019		2018		2017		2016		Prior
Construction real estate:
Pass	$	155,693	$	180,536	$	76,090	$	55,636	$	3,191	$	8,297	$	101,793	$	581,236
Pass watch	—		—		—		—		23		—		—		23
Special mention	—		—		—		—		—		—		—		—
Substandard	—		382		62		—		—		58		—		502
Doubtful	—		—		—		—		—		180		—		180
Total construction real estate	$	155,693	$	180,918	$	76,152	$	55,636	$	3,214	$	8,535	$	101,793	$	581,941
1-4 family residential real estate:
Pass	$	154,003	$	114,063	$	70,621	$	55,557	$	57,680	$	255,003	$	2,833	$	709,760
Pass watch	—		—		—		—		267		564		—		831
Special mention	—		—		—		—		—		10		—		10
Substandard	1,473		—		135		427		1,588		5,134		96		8,853
Doubtful	—		—		—		36		103		359		—		498
Total 1-4 family residential real estate	$	155,476	$	114,063	$	70,756	$	56,020	$	59,638	$	261,070	$	2,929	$	719,952
Commercial real estate:
Pass	$	270,087	$	307,161	$	143,177	$	162,180	$	98,828	$	179,919	$	6,957	$	1,168,309
Pass watch	—		—		3,153		40,125		1,696		2,582		—		47,556
Special mention	4,555		33,020		7,041		140		4,531		7,850		—		57,137
Substandard	7,542		—		2,097		65		704		12,282		—		22,690
Doubtful	—		—		—		—		—		54		—		54
Total commercial real estate	$	282,184	$	340,181	$	155,468	$	202,510	$	105,759	$	202,687	$	6,957	$	1,295,746
Commercial loans:
Pass	$	313,688	$	47,446	$	20,386	$	7,505	$	3,392	$	6,142	$	140,018	$	538,577
Pass watch	2,599		1,318		2,410		1,981		—		—		370		8,678
Special mention	304		809		433		39		286		265		455		2,591
Substandard	405		1,081		473		7		—		—		4,417		6,383
Doubtful	310		53		475		54		1		—		—		893
Total commercial loans	$	317,306	$	50,707	$	24,177	$	9,586	$	3,679	$	6,407	$	145,260	$	557,122
Municipal loans:
Pass	$	72,542	$	68,132	$	33,735	$	61,170	$	25,387	$	148,062	$	—	$	409,028
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	72,542	$	68,132	$	33,735	$	61,170	$	25,387	$	148,062	$	—	$	409,028
Loans to individuals:
Pass	$	46,722	$	25,302	$	10,132	$	4,716	$	1,867	$	917	$	3,900	$	93,556
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		51		—		—		—		4		55
Substandard	6		35		28		30		9		11		1		120
Doubtful	73		20		6		55		81		24		—		259
Total loans to individuals	$	46,801	$	25,357	$	10,217	$	4,801	$	1,957	$	952	$	3,905	$	93,990
Total loans	$	1,030,002	$	779,358	$	370,505	$	389,723	$	199,634	$	627,713	$	260,844	$	3,657,779

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The following tables present the aging of the amortized cost basis in past due loans by class of loans (in thousands):

	March 31, 2021
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current		Total
Real estate loans:
Construction	$	1,130	$	—	$	—	$	1,130	$	604,547	$	605,677
1-4 family residential	5,321		614		486		6,421		694,009		700,430
Commercial	4,676		—		—		4,676		1,343,875		1,348,551
Commercial loans	1,507		245		641		2,393		562,352		564,745
Municipal loans	—		—		—		—		406,377		406,377
Loans to individuals	418		30		3		451		90,367		90,818
Total	$	13,052	$	889	$	1,130	$	15,071	$	3,701,527	$	3,716,598

	December 31, 2020
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current		Total
Real estate loans:
Construction	$	95	$	14	$	444	$	553	$	581,388	$	581,941
1-4 family residential	7,872		2,469		2,830		13,171		706,781		719,952
Commercial	467		315		86		868		1,294,878		1,295,746
Commercial loans	1,423		4,516		323		6,262		550,860		557,122
Municipal loans	64		—		—		64		408,964		409,028
Loans to individuals	519		123		27		669		93,321		93,990
Total	$	10,440	$	7,437	$	3,710	$	21,587	$	3,636,192	$	3,657,779

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

	March 31, 2021		December 31, 2020
Nonaccrual loans:
Real estate loans:
Construction	$	248	$	640
1-4 family residential	1,929		3,922
Commercial	1,229		1,269
Commercial loans	1,682		1,592
Loans to individuals	226		291
Total nonaccrual loans (1)	5,314		7,714
Accruing loans past due more than 90 days	—		—
TDR loans	9,641		9,646
OREO	412		106
Repossessed assets	—		14
Total nonperforming assets	$	15,367	$	17,480

(1)    Includes $889,000 and $976,000 of restructured loans as of March 31, 2021 and December 31, 2020, respectively.

We reversed $18,000 and $121,000 of interest income on nonaccrual loans during the three months ended March 31, 2021 and 2020, respectively. We had $1.6 million and $2.2 million of loans on nonaccrual for which there was no related allowance for credit losses as of March 31, 2021 and December 31, 2020, respectively.

Collateral-dependent loans are loans that we expect the repayment to be provided substantially through the operation or sale of the collateral of the loan and we have determined that the borrower is experiencing financial difficulty. In such cases, expected credit losses are based on the fair value of the collateral at the measurement date, adjusted for selling costs. As of March 31, 2021 and December 31, 2020, we had $11.2 million and $11.5 million, respectively, of collateral-dependent loans, secured mainly by real estate and equipment. There have been no significant changes to the collateral that secures the collateral-dependent assets. Foreclosed assets include OREO 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 $234,000 and $1.2 million in loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of March 31, 2021 and December 31, 2020, respectively.

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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.

In response to the impact of the COVID-19 pandemic on the economy, the CARES Act was signed into law. Under the CARES Act, banks may elect to deem that loan modifications do not result in TDRs if they are: (1) related to COVID-19; (2) executed on a loan that was not more than 30 days past due as of December 31, 2019; and (3) executed between March 1, 2020, and the earlier of (A) 60 days after the date of termination of the national emergency declaration or (B) December 31, 2020. The Economic Aid Act extended this relief to the earlier of 60 days after the national emergency termination date or January 1, 2022. Additionally, in accordance with the Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus (Revised), other short-term modifications made on a good faith basis in response to COVID-19 to borrowers who were current prior to any relief are not TDRs under ASC Subtopic 310-40. This includes short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant. Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented. Loans modified under this guidance are not considered TDRs and as such are not identified in the table below. At March 31, 2021 and December 31, 2020, we had outstanding loans with payment deferrals, generally for up to three months, totaling $1.7 million and $47.2 million, respectively.

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

	Three Months Ended March 31, 2021
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real estate loans:
1-4 family residential	$	—	$	—	$	130	$	130	2
Commercial loans	—		—		18		18		1
Total	$	—	$	—	$	148	$	148	3

	Three Months Ended March 31, 2020
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real estate loans:
Commercial	$	—	$	—	$	59	$	59	1
Commercial loans	—		—		3		3		1
Total	$	—	$	—	$	62	$	62	2

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 three months ended March 31, 2021 and 2020 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 loans 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 months ended March 31, 2021, and 2020 the amount of TDRs in default was not significant. Payment defaults for TDRs did not significantly impact the determination of the allowance for loan losses in the periods presented.

At March 31, 2021 and 2020, there were no commitments to lend additional funds to borrowers whose terms had been modified in TDRs.

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Allowance for Loan Losses

In accordance with ASC 326, the allowance for credit losses on loans is estimated and recognized upon origination of the loan based on expected credit losses. The CECL model uses historical experience and current conditions for homogeneous pools of loans, and reasonable and supportable forecasts about future events. The impact of varying economic conditions and portfolio stress factors are a component of the credit loss models applied to each portfolio. Reserve factors are specific to the loan segments that share similar risk characteristics based on the probability of default assumptions and loss given default assumptions, over the contractual term. The forecasted periods gradually mean-revert to the long-run trend based upon historical data. Management evaluates the economic data points used in the Moody’s forecasting scenarios on a quarterly basis to determine the most appropriate impact to the various portfolio characteristics based on management’s view and applies weighting to various forecasting scenarios as deemed appropriate based on known and expected economic activities. Management also considers and may apply relevant qualitative factors, not previously considered, to determine the appropriate allowance level. The use of the CECL model includes significant judgment by management and may differ from those of our peers due to different historical loss patterns, economic forecasts, and the length of time of the reasonable and supportable forecast period and reversion period.

We utilize Moody’s Analytics economic forecast scenarios and assign probability weighting to those scenarios which best reflect management’s views on the economic forecast. The probability weighting and scenarios utilized for the estimate of the allowance were generally reflective of an improved economic forecast based on known and knowable information as of March 31, 2021.

When determining the appropriate allowance for credit losses on our loan portfolio, our commercial construction and real estate loans, commercial loans and municipal loans utilize the probability of default/loss given default discounted cash flow approach. Reserves on these loans are based upon risk factors including the loan type and structure, collateral type, leverage ratio, refinancing risk and origination quality, among others. Our consumer construction real estate loans, 1-4 family residential loans and our loans to individuals use a loss rate based upon risk factors including loan types, origination year and credit scores. PPP loans are fully guaranteed by the SBA and therefore do not have an associated allowance.

Loans evaluated collectively in a pool are monitored to ensure they continue to exhibit similar risk characteristics with other loans in the pool. If a loan does not share similar risk characteristics with other loans, expected credit losses for that loan are evaluated individually.

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

	Three Months Ended March 31, 2021
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	6,490	$	2,270	$	35,709	$	4,107	$	46	$	384	$	49,006
Loans charged-off	—		(73)		—		(319)		—		(403)		(795)
Recoveries of loans charged-off	1		55		—		282		—		284		622
Net loans (charged-off) recovered	1		(18)		—		(37)		—		(119)		(173)
Provision for (reversal of) loan losses	1,710		256		(8,473)		(962)		—		90		(7,379)
Balance at end of period	$	8,201	$	2,508	$	27,236	$	3,108	$	46	$	355	$	41,454

	Three Months Ended March 31, 2020
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,539	$	3,833	$	9,572	$	6,351	$	570	$	932	$	24,797
Impact of CECL adoption - cumulative effect adjustment	2,968		(1,447)		7,730		(3,532)		(522)		(125)		5,072
Impact of CECL adoption - purchased loans with credit deterioration	(15)		(6)		333		(22)		—		(59)		231
Loans charged-off	(33)		(54)		(21)		(296)		—		(591)		(995)
Recoveries of loans charged-off	11		4		69		74		—		293		451
Net loans (charged-off) recovered	(22)		(50)		48		(222)		—		(298)		(544)
Provision for (reversal of) loan losses(1)	3,184		310		18,437		1,944		(1)		208		24,082
Balance at end of period	$	9,654	$	2,640	$	36,120	$	4,519	$	47	$	658	$	53,638

(1)    The increase in the provision for credit losses during 2020 was primarily due to the economic impact of COVID-19 on macroeconomic factors used in the CECL model.

The accrued interest receivable on our loan receivables is excluded from the allowance for credit loss estimate and is included in interest receivable on our consolidated balance sheets. As of March 31, 2021 and December 31, 2020, the accrued interest on our loan portfolio was $13.8 million and $16.4 million, respectively.

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6. Borrowing Arrangements

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

	March 31, 2021			December 31, 2020
Other borrowings:
Balance at end of period	$	22,315		$	23,172
Average amount outstanding during the period (1)	23,522			91,940
Maximum amount outstanding during the period (2)	24,549			219,259
Weighted average interest rate during the period (3)	0.2		%	0.4		%
Interest rate at end of period (4)	0.2		%	0.1		%
FHLB borrowings:
Balance at end of period	$	665,530		$	832,527
Average amount outstanding during the period (1)	727,513			1,032,269
Maximum amount outstanding during the period (2)	723,584			1,274,370
Weighted average interest rate during the period (3)	1.1		%	1.1		%
Interest rate at end of period (4)	1.1		%	1.0		%

(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.

Maturities of the obligations associated with our borrowing arrangements based on scheduled repayments at March 31, 2021 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
Other borrowings	$	22,315	$	—	$	—	$	—	$	—	$	—	$	22,315
FHLB borrowings	661,659		687		717		748		775		944		665,530
Total obligations	$	683,974	$	687	$	717	$	748	$	775	$	944	$	687,845

Other borrowings include federal funds purchased, repurchase agreements and borrowings from the FRDW. 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 March 31, 2021 or December 31, 2020.  To provide more liquidity in response to the economic impact of the COVID-19 pandemic, the Federal Reserve took steps to encourage broader use of the discount window. At March 31, 2021, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities and PPP loans, was approximately $618.1 million. There were no borrowings from the FRDW at March 31, 2021 or December 31, 2020. Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit, and at March 31, 2021, the line had one outstanding letter of credit for $91,000. 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 repurchase agreements. These repurchase agreements totaled $22.3 million at March 31, 2021 and $23.2 million at December 31, 2020, and had maturities of less than one year.  Repurchase agreements are secured by investment and MBS securities and are stated at the amount of cash received in connection with the transaction.

FHLB borrowings represent borrowings with fixed interest rates ranging from 0.08% to 4.799% and with remaining maturities of five days to 7.3 years at March 31, 2021.  FHLB borrowings may be collateralized by FHLB stock, nonspecified loans and/or securities. At March 31, 2021, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by

Southside Bancshares, Inc. |26

securities, FHLB stock and nonspecified loans and securities, was approximately $1.25 billion, net of FHLB stock purchases required.  

Southside Bank has entered into various variable rate agreements and fixed rate short-term pay agreements with third-party financial institutions with rates tied to LIBOR. These agreements totaled $625.0 million at March 31, 2021 and $670.0 million at December 31, 2020. Six of the agreements have an interest rate tied to three-month LIBOR, and the remaining agreements have interest rates tied to one-month LIBOR. In connection with all of these agreements, Southside Bank also entered into various interest rate swap contracts that are treated as cash flow hedges under ASC Topic 815, “Derivatives and Hedging” that are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the underlying LIBOR interest rate. The interest rate swap contracts had a weighted average rate of 1.11% with a weighted average maturity of 3.8 years at March 31, 2021. Refer to “Note 9 – 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.

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7. Long-term Debt

Information related to our long-term debt is summarized as follows for the periods presented (in thousands):    

	March 31, 2021		December 31, 2020
Subordinated notes: (1)
3.875% Subordinated notes, net of unamortized debt issuance costs (2)	$	98,469	$	98,497
5.50% Subordinated notes, net of unamortized debt issuance costs (3)	98,799		98,754
Total Subordinated notes	197,268		197,251
Trust preferred subordinated debentures: (4)
Southside Statutory Trust III, net of unamortized debt issuance costs (5)	20,564		20,563
Southside Statutory Trust IV	23,196		23,196
Southside Statutory Trust V	12,887		12,887
Magnolia Trust Company I	3,609		3,609
Total Trust preferred subordinated debentures	60,256		60,255
Total Long-term debt	$	257,524	$	257,506

(1)This debt consists of subordinated notes with a remaining maturity greater than one year that qualify under the risk-based capital guidelines as Tier 2 capital, subject to certain limitations.

(2)The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.5 million at March 31, 2021 and December 31, 2020.

(3)The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.2 million at March 31, 2021 and December 31, 2020.

(4)This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.

(5)The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $55,000 at March 31, 2021 and $56,000 at December 31, 2020.

As of March 31, 2021, the details of the subordinated notes and the trust preferred subordinated debentures are summarized below (dollars in thousands):

	Date Issued	Amount Issued		Fixed or Floating Rate	Interest Rate	Maturity Date
3.875% Subordinated Notes	November 6, 2020	$	100,000	Fixed-to-Floating	3.875%	November 15, 2030
5.50% Subordinated Notes	September 19, 2016	$	100,000	Fixed-to-Floating	5.50%	September 30, 2026
Southside Statutory Trust III	September 4, 2003	$	20,619	Floating	3 month LIBOR + 2.94%	September 4, 2033
Southside Statutory Trust IV	August 8, 2007	$	23,196	Floating	3 month LIBOR + 1.30%	October 30, 2037
Southside Statutory Trust V	August 10, 2007	$	12,887	Floating	3 month LIBOR + 2.25%	September 15, 2037
Magnolia Trust Company I (1)	October 10, 2007	$	3,609	Floating	3 month LIBOR + 1.80%	November 23, 2035

(1)On October 10, 2007, as part of an acquisition we assumed $3.6 million of floating rate junior subordinated debentures issued in 2005 to Magnolia Trust Company I.

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On September 19, 2016, the Company issued $100.0 million in aggregate principal amount of fixed-to-floating rate subordinated notes that mature on September 30, 2026. This debt initially bears interest at a fixed rate of 5.50% through September 29, 2021 and thereafter, adjusts quarterly at a floating rate equal to three-month LIBOR plus 429.7 basis points. The proceeds from the sale of the subordinated notes were used for general corporate purposes, which included advances to the Bank to finance its activities.

On November 6, 2020, the Company issued $100.0 million in aggregate principal amount of fixed-to-floating rate subordinated notes that mature on November 15, 2030. This debt initially bears interest at a fixed rate of 3.875% per year through November 14, 2025 and thereafter, adjusts quarterly at a floating rate equal to the then current three-month term SOFR, as published by the FRBNY, plus 366 basis points. The proceeds from the sale of the subordinated notes were used for general corporate purposes.

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 March 31,
	Defined Benefit Pension Plan				Defined Benefit Pension Plan Acquired				Restoration Plan
	2021		2020		2021		2020		2021		2020
Service cost	$	—	$	423	$	—	$	—	$	—	$	85
Interest cost	628		837		24		41		121		160
Expected return on assets	(1,437)		(1,668)		(58)		(84)		—		—
Net loss amortization	520		533		3		2		118		193
Prior service (credit) cost amortization	—		(3)		—		—		—		2
Net periodic benefit (income) cost	$	(289)	$	122	$	(31)	$	(41)	$	239	$	440

Prior to the freeze of all future benefit accruals and accrual of benefit service as of December 31, 2020, the service cost component was recorded on our consolidated income statements as salaries and employee benefits in noninterest expense. All other components other than service costs are recorded in other noninterest expense.

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9.    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, fair value hedges of a recognized asset or liability or as non-hedging instruments. Gains and losses on derivative instruments designated as cash flow hedges are recorded in AOCI to the extent they are effective. If the hedge is 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. For derivative instruments not designated as hedging instruments, the gain or loss is recognized in current earnings during the period of change.

We have entered into certain interest rate swap contracts on specific variable rate agreements and fixed rate short-term pay agreements with third-party financial institutions. 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 $625.0 million of debt. The cash flows from the swap contracts are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the underlying LIBOR interest rate.

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 the forecasted transaction will not occur by the end of the originally specified time period. 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.

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. 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 March 31, 2021 and December 31, 2020, net derivative liabilities included $19.1 million and $39.3 million, respectively, of cash collateral held by counterparties subject to master netting agreements. We had $1.3 million of cash collateral receivable that was not offset against derivative liabilities at March 31, 2021.

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):

	March 31, 2021						December 31, 2020
			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	$	625,000	$	2,145	$	11,189	$	670,000	$	—	$	21,635
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	217,655		910		10,980		152,280		—		18,537
Swaps-Customer counterparties	217,655		10,980		910		152,280		18,537		—
Gross derivatives			14,035		23,079				18,537		40,172
Offsetting derivative assets/liabilities			(3,055)		(3,055)				—		—
Cash collateral received/posted			—		(19,114)				—		(39,270)
Net derivatives included in the consolidated balance sheets (2)			$	10,980	$	910			$	18,537	$	902

(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 $1.3 million credit exposure related to interest rate swaps with financial institutions and $11.0 million related to interest rate swaps with customers at March 31, 2021. We had no credit exposure related to interest rate swaps with financial institutions and $18.5 million related to interest rate swaps with customers at December 31, 2020. 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 fixed pay swaps are based on one-month or three-month LIBOR rates in effect at March 31, 2021 and December 31, 2020:

	March 31, 2021							December 31, 2020
			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	$	625,000	3.8	0.14	%	1.11	%	$	670,000	3.8	0.17	%	1.12	%
Swaps-Non-hedging
Financial institution counterparties	217,655		11.0	0.52	%	2.43	%	152,280		9.8	0.50	%	2.57	%
Customer counterparties	217,655		11.0	2.43	%	0.52	%	152,280		9.8	2.57	%	0.50	%

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10.  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 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 market participants would use in pricing the asset or liability.  Valuation policies and procedures are determined by our investment department and reported to our 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.

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. 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.

Securities AFS and Equity Investments with readily determinable fair values – U.S. Treasury securities and equity investments with readily determinable fair values are reported at fair value utilizing Level 1 inputs.  Other securities classified as AFS 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 some 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 two 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. 

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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 collateral-dependent loans at March 31, 2021 and December 31, 2020.

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 credit losses.

Collateral-Dependent Loans (Impaired loans prior to the adoption of ASU 2016-13) – Certain loans may be reported at the fair value of the underlying collateral if repayment is expected substantially from the operation or sale of the collateral.  Collateral values are estimated using Level 3 inputs based on customized discounting criteria or appraisals.  At March 31, 2021 and December 31, 2020, the impact of the fair value of collateral-dependent loans was reflected in our allowance for loan losses.

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 fair value tables do not necessarily represent their underlying value.

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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):

			Fair Value Measurements at the End of the Reporting Period Using
March 31, 2021	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	$	42,477	$	42,477	$	—	$	—
State and political subdivisions	1,591,645		—		1,591,645		—
Other stocks and bonds	92,783		—		92,783		—
MBS: (1)
Residential	707,074		—		707,074		—
Commercial	112,945		—		112,945		—
Equity investments:
Equity investments	5,988		5,988		—		—
Derivative assets:
Interest rate swaps	14,035		—		14,035		—
Total asset recurring fair value measurements	$	2,566,947	$	48,465	$	2,518,482	$	—
Derivative liabilities:
Interest rate swaps	$	23,079	$	—	$	23,079	$	—
Total liability recurring fair value measurements	$	23,079	$	—	$	23,079	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	412	$	—	$	—	$	412
Collateral-dependent loans (2)	10,223		—		—		10,223
Total asset nonrecurring fair value measurements	$	10,635	$	—	$	—	$	10,635

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			Fair Value Measurements at the End of the Reporting Period Using
December 31, 2020	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:
State and political subdivisions	$	1,580,594	$	—	$	1,580,594	$	—
Other stocks and bonds	78,255		—		78,255		—
MBS: (1)
Residential	810,010		—		810,010		—
Commercial	118,446		—		118,446		—
Equity investments:
Equity investments	6,094		6,094		—		—
Derivative assets:
Interest rate swaps	18,537		—		18,537		—
Total asset recurring fair value measurements	$	2,611,936	$	6,094	$	2,605,842	$	—
Derivative liabilities:
Interest rate swaps	$	40,172	$	—	$	40,172	$	—
Total liability recurring fair value measurements	$	40,172	$	—	$	40,172	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	120	$	—	$	—	$	120
Collateral-dependent loans (2)	10,653		—		—		10,653
Total asset nonrecurring fair value measurements	$	10,773	$	—	$	—	$	10,773

(1)All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

(2)Consists of individually evaluated loans. Loans for which the fair value of the collateral and commercial real estate fair value of the properties is less than cost basis are presented net of allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.

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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 MBS HTM – 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 – The carrying value of 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 – We estimate the fair value of our loan portfolio to an exit price notion with adjustments for liquidity, credit and prepayment factors. 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.

Other borrowings – 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.

Trust preferred subordinated debentures – 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
March 31, 2021	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	107,623	$	107,623	$	107,623	$	—	$	—
Investment securities:
HTM, at carrying value	908		917		—		917		—
MBS:
HTM, at carrying value	97,251		103,260		—		103,260		—
FHLB stock, at cost	18,754		18,754		—		18,754		—
Equity investments	5,816		5,816		—		5,816		—
Loans, net of allowance for loan losses	3,675,144		3,833,854		—		—		3,833,854
Loans held for sale	2,615		2,615		—		2,615		—
Financial liabilities:
Deposits	$	5,092,643	$	5,095,397	$	—	$	5,095,397	$	—
Other borrowings	22,315		22,315		—		22,315		—
FHLB borrowings	665,530		675,135		—		675,135		—
Subordinated notes, net of unamortized debt issuance costs	197,268		198,103		—		198,103		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,256		47,183		—		47,183		—

			Estimated Fair Value
December 31, 2020	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	108,408	$	108,408	$	108,408	$	—	$	—
Investment securities:
HTM, at carrying value	907		920		—		920		—
Mortgage-backed securities:
HTM, at carrying value	108,091		117,278		—		117,278		—
Federal Home Loan Bank stock, at cost	25,259		25,259		—		25,259		—
Equity investments	5,811		5,811		—		5,811		—
Loans, net of allowance for loan losses	3,608,773		3,784,291		—		—		3,784,291
Loans held for sale	3,695		3,695		—		3,695		—
Financial liabilities:
Deposits	$	4,932,322	$	4,936,188	$	—	$	4,936,188	$	—
Other borrowings	23,172		23,172		—		23,172		—
FHLB borrowings	832,527		854,865		—		854,865		—
Subordinated notes, net of unamortized debt issuance costs	197,251		198,391		—		198,391		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,255		51,993		—		51,993		—

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11.     Income Taxes

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

	Three Months Ended March 31,
	2021		2020
Current income tax expense	$	2,589	$	5,554
Deferred income tax expense (benefit)	2,161		(5,075)
Income tax expense	$	4,750	$	479

The net deferred tax liability totaled $9.9 million at March 31, 2021 and $15.5 million at December 31, 2020.  No valuation allowance was recorded at March 31, 2021 or December 31, 2020, as management believes it is more likely than not that all of the deferred tax asset items will be realized in future years. Unrecognized tax benefits were not material at March 31, 2021 or December 31, 2020.

We recognized income tax expense of $4.8 million, for an ETR of 12.2% for the three months ended March 31, 2021, compared to income tax expense of $479,000, for an ETR of 10.8%, for the three months ended March 31, 2020. The higher ETR for the three months ended March 31, 2021 was primarily due to a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same periods in 2020. The ETR differs from the statutory rate of 21% for the three months ended March 31, 2021 and 2020 primarily due to the effect of tax-exempt income from municipal loans and securities, as well as BOLI. We file 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 2017 or Texas state tax examinations by tax authorities for years before 2016.

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12.     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. The allowance for credit losses on these off-balance-sheet credit exposures is calculated using the same methodology as loans including a conversion or usage factor to anticipate ultimate exposure and expected losses and is included in other liabilities on our consolidated balance sheets.

Allowance for off-balance-sheet credit exposures were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Balance at beginning of period	$	6,386	$	1,455
Impact of CECL adoption	—		4,840
Provision for (reversal of) off-balance-sheet credit exposures	(2,770)		1,165
Balance at end of period	$	3,616	$	7,460

Contractual commitments to extend credit are agreements to lend to a customer provided the terms established in the contract are met.  Commitments to extend credit 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 commitments to extend credit and similarly do not necessarily represent future cash obligations.

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

	March 31, 2021		December 31, 2020
Commitments to extend credit	$	811,574	$	793,138
Standby letters of credit	10,825		13,658
Total	$	822,399	$	806,796

We apply the same credit policies in making commitments to extend credit 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.

Leases. During the three months ended March 31, 2021, there was $1.1 million of operating lease right-of-use assets obtained in exchange for new operating lease liabilities, primarily due to one lease that commenced in January 2021 with an initial right-of-use asset of $1.1 million. There was $227,000 of operating lease right-of-use assets obtained in exchange for new operating lease liabilities for the three months ended March 31, 2020.

Securities. In the normal course of business we buy and sell securities. At March 31, 2021, there were $23.5 million of unsettled trades to purchase securities and no unsettled trades to sell securities. At December 31, 2020, there were no unsettled trades to purchase securities and no unsettled trades to sell securities.

Deposits. There were no unsettled issuances of brokered CDs at March 31, 2021 or December 31, 2020.

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 2020 Form 10-K. Certain risks, uncertainties and other factors, including those set forth under "Risk Factors" in Part I, Item 1A. of the 2020 Form 10-K and elsewhere in this Quarterly Report on Form 10-Q, may cause actual results to differ materially from the results discussed in the forward-looking statements appearing in this discussion and analysis.

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,” “might,” “will,” “would,” “seek,” “intend,” “probability,” “risk,” “goal,” “target,” “objective,” “plans,” “potential,” and similar expressions. Forward-looking statements are statements with respect to our beliefs, plans, expectations, objectives, goals, anticipations, assumptions, estimates, intentions and 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 of the effect of our expansion, benefits of the Share Repurchase Plan, trends in asset quality and earnings from growth, and certain market risk disclosures 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.  The most recent factor that could cause future results to differ materially from those anticipated by our forward-looking statements include the negative impact of the COVID-19 pandemic on our business, financial position, operations and prospects, including our ability to continue our business activities in certain communities we serve, the duration of the pandemic and its continued effects on financial markets, a reduction in financial transaction and business activities resulting in decreased deposits and reduced loan originations, increases in unemployment rates impacting our borrowers’ ability to repay their loans, our ability to manage liquidity in a rapidly changing and unpredictable market, additional interest rate changes by the Federal Reserve and other government actions in response to the pandemic including regulations or laws enacted to counter the effects of the COVID-19 pandemic on the economy. 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:

•the impact of the COVID-19 pandemic on our future consolidated financial condition and results of operations;

•general (i) political conditions, including, without limitation, governmental action and uncertainty resulting from U.S. and global political trends and (ii) 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 or 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 or our customers or our borrowers are engaged, including the impact of the Dodd-Frank Act, the Federal Reserve’s actions with respect to interest rates, the capital requirements promulgated by the Basel Committee, the CARES Act, the Economic Aid Act, uncertainty relating to calculation of LIBOR and other regulatory responses to economic conditions;

•adverse changes in the status or financial condition of the GSEs which impact the GSEs’ guarantees or ability to pay or issue debt;

•adverse changes in the credit portfolios 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 and other disruptions, or innovations to the financial services industry, including as a result of the increased telework environment;

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•our ability to identify and address cyber-security risks such as data security breaches, malware, “denial of service” attacks, “hacking” and identity theft, 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, compliance program or our corporate governance and supervisory oversight functions 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 net interest margins and may impact prepayments on our 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 the Bank and its ability to pay dividends to us;

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

•the failure to maintain an effective system of controls and procedures, including internal control over financial reporting;

•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, including the costs and effects of litigation related to our participation in government stimulus programs associated with the COVID-19 pandemic;

•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 fluctuations in 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, including as a result of the economic impact of COVID-19;

•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, including the implementation of the CECL model;

•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;

•risks related to environmental liability as a result of certain lending activity;

•risks associated with our common stock and our other securities, including fluctuations in our stock price and general volatility in the stock market; and

•other risks and uncertainties discussed in “Part I - Item 1A. Risk Factors” in the 2020 Form 10-K.

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.

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Critical Accounting Estimates

Our accounting and reporting estimates conform with U.S. 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. We consider accounting estimates that can (1) be replaced by other reasonable estimates and/or (2) changes to an estimate from period to period that have a material impact on the presentation of our financial condition, changes in financial condition or results of operations as well as (3) those estimates that require significant and complex assumptions about matters that are highly uncertain to be critical accounting estimates. We consider our critical accounting policies to include allowance for credit losses on loans, estimation of fair value and pension plan accounting.

Critical accounting estimates include a high degree of uncertainty in the underlying assumptions. Management bases its estimates on historical experience, current information and other factors deemed relevant. The development, selection and disclosure of our critical accounting estimates are reviewed with the Audit Committee of the Company's Board of Directors. Actual results could differ from these estimates. For additional information regarding critical accounting policies, refer to “Note 1 – Summary of Significant Accounting and Reporting Policies” and “Note 5 – Loans and Allowance for Loan Losses” in the notes to consolidated financial statements and refer to “Part II - Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations - Critical Accounting Estimates,” and “Note 1 – Summary of Significant Accounting and Reporting Policies” in the 2020 Form 10-K. As of March 31, 2021, there have been no significant changes to our critical accounting estimates.

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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: 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% for the three months ended March 31, 2021 and 2020, 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 that 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.

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% marginal tax rate for the three months ended March 31, 2021 and 2020, 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 March 31,
	2021			2020
Net interest income (GAAP)	$	46,303		$	44,701
Tax equivalent adjustments:
Loans	736			668
Tax-exempt investment securities	2,211			1,631
Net interest income (FTE) (1)	$	49,250		$	47,000
Average earning assets	$	6,241,434		$	6,248,759
Net interest margin	3.01		%	2.88		%
Net interest margin (FTE) (1)	3.20		%	3.03		%
Net interest spread	2.84		%	2.61		%
Net interest spread (FTE) (1)	3.03		%	2.76		%

(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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OVERVIEW

COVID-19

During March 2020, the World Health Organization declared COVID-19 a global pandemic in response to the rapidly growing outbreak of the virus. COVID-19 significantly impacted local, national and global economies due to stay-at-home orders and social distancing guidelines. In compliance with social distancing guidelines issued by federal, state and local governments, we initially closed all of our grocery store branches. As stay-at-home orders were issued by local governments in our market areas to combat the spread of the virus, we closed all traditional lobbies and wealth management and trust offices to walk-in customers, however, most of these traditional locations were offering certain services by appointment only. All other banking services were available to customers through our drive-thrus, ATMs/ITMs and automated telephone, internet and mobile banking products. After careful consideration and implementation of additional safety precautions, all locations were reopened on June 1, 2020. We have since made adjustments to select branch hours and openings, and we continue to closely monitor the COVID-19 situation. Approximately 45% of our workforce has remote working capabilities, however currently we have a much smaller percentage of our workforce working remotely.

COVID-19 significantly disrupted supply chains, business activity and the overall economic and financial markets.  These disruptions have and are likely to continue to result in a decline in demand for banking products or services, including loans and deposits which could impact our future financial condition, results of operations and liquidity. As of March 31, 2021, most businesses in Texas are re-opened without restrictions. Commercial activity has improved but has not returned to the levels existing prior to the outbreak of the pandemic. The extent to which the COVID-19 pandemic affects our business, operations and financial condition, as well as our regulatory capital and liquidity ratios and credit ratings, is highly uncertain and unpredictable and depends on, among other things, new information that may emerge concerning the scope, duration and severity of the COVID-19 pandemic, actions taken by governmental authorities and other parties in responses to the pandemic, the scale of the distribution and public acceptance of the vaccines for COVID-19 and the effectiveness of such vaccines in stemming or stopping the spread of COVID-19. The adverse impact on the markets in which we operate and on our business, operations and financial condition is expected to remain elevated until the pandemic subsides.   

In response to the COVID-19 pandemic, the CARES Act was signed into law on March 27, 2020. The CARES Act provided an estimated $2.2 trillion to address the economic impact of the COVID-19 pandemic and stimulate the economy by supporting individuals and businesses through loans, grants, tax changes, and other types of relief. The CARES Act also included provisions to encourage financial institutions to work prudently with borrowers. As an SBA lender, we were well positioned to assist business customers in accessing funds available through the PPP implemented in April. At March 31, 2021, we had $220.9 million of approved PPP loans outstanding. On December 27, 2020, the Economic Aid Act was signed into law. This second coronavirus relief package granted additional funds for a new round of PPP loans. Additionally, it expands the eligibility for loans and allows certain businesses to request a second loan. The SBA began accepting applications for the second round of PPP loans on January 13, 2021. As of March 31, 2021, we had originated $91.2 million of additional PPP loans under this second round of PPP loans and $105.1 million as of April 21, 2021.

Additionally, we are assisting both our consumer and commercial borrowers that may be experiencing financial hardship due to COVID-19 related challenges. As of March 31, 2021, we had outstanding loans with payment deferrals, generally for up to three months, totaling $1.7 million, a 99.5% decrease from $326.0 million reported in our second quarter earnings release in July 2020. As of April 22, 2021, we had outstanding loans with payment deferrals totaling $1.4 million. The decrease in the COVID-19 modified loans are the result of the loans coming out of the deferral periods and resuming performance. The largest category of remaining deferrals include 1-4 family residential loans.

Operating Results

During the three months ended March 31, 2021, our net income increased $30.1 million, or 762.4%, to $34.1 million from $4.0 million for the same period in 2020. The increase in net income was due to the $35.4 million decrease in provision for credit losses, due to a large build-up in the allowance for credit losses of $25.2 million for the first quarter ended March 31, 2020, compared to a $10.1 million reversal of provision for the same period in 2021. The decrease in the provision was primarily due to improvement in the economic forecast in the first quarter of 2021 and its effect on macroeconomic factors used in the CECL model. Additionally, net interest income increased $1.6 million. These were partially offset by the $1.9 million decrease in noninterest income and the $714,000 increase in noninterest expense. Earnings per diluted common share increased $0.92, or 766.7%, to $1.04 for the three months ended March 31, 2021, from $0.12 for the same period in 2020.

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Financial Condition

Our total assets decreased $9.3 million, or 0.1%, to $7.0 billion at March 31, 2021 from $7.01 billion at December 31, 2020. Our securities portfolio decreased by $51.2 million, or 1.9%, to $2.65 billion, compared to $2.70 billion at December 31, 2020, primarily a result of the decline in the estimated fair value of the securities portfolio. Our FHLB stock decreased $6.5 million, or 25.8%, to $18.8 million from $25.3 million at December 31, 2020, primarily due to decreases in the amount of FHLB stock we were required to hold in relation to our FHLB borrowings.

Loans increased $58.8 million, or 1.6%, to $3.72 billion at March 31, 2021 from $3.66 billion at December 31, 2020. The net increase in our loan portfolio was comprised of increases of $52.8 million of commercial real estate loans, $23.7 million of construction loans and $7.6 million of commercial loans, partially offset by decreases of $19.5 million of 1-4 family residential loans, $3.2 million of loans to individuals and $2.7 million of municipal loans. Our PPP loans, a component of the commercial loan category, experienced a net increase of $6.0 million, or 2.8%, to $220.9 million as of March 31, 2021, from $214.8 million at December 31, 2020, due to additional funding under the renewed Economic Aid Act, partially offset by the forgiveness payments received from loans funded under the CARES Act. Loans held for sale decreased $1.1 million, or 29.2%, to $2.6 million at March 31, 2021 from $3.7 million at December 31, 2020.

Our nonperforming assets at March 31, 2021 decreased $2.1 million, or 12.1%, to $15.4 million and represented 0.22% of total assets, compared to $17.5 million, or 0.25% of total assets at December 31, 2020.  Nonaccruing loans decreased $2.4 million, or 31.1%, to $5.3 million, and the ratio of nonaccruing loans to total loans decreased to 0.14% at March 31, 2021 compared to 0.21% at December 31, 2020.  Restructured loans were $9.6 million at March 31, 2021 and December 31, 2020. OREO increased to $412,000 at March 31, 2021 from $106,000 at December 31, 2020. 

Our deposits increased $160.3 million, or 3.3%, to $5.09 billion at March 31, 2021 from $4.93 billion at December 31, 2020, which was comprised of an increase of $131.8 million in interest bearing deposits and an increase of $28.6 million in noninterest bearing deposits. The increase was largely driven by PPP loan disbursements and stimulus checks deposited during the first quarter of 2021. Brokered deposits decreased $57.0 million, or 41.3% for the three months ended March 31, 2021.

Total FHLB borrowings decreased $167.0 million, or 20.1%, to $665.5 million at March 31, 2021 from $832.5 million at December 31, 2020.

Our total shareholders’ equity at March 31, 2021 decreased 1.9%, or $16.7 million, to $858.6 million, or 12.3% of total assets, compared to $875.3 million, or 12.5% of total assets, at December 31, 2020. The decrease in shareholders’ equity was the result of other comprehensive loss of $29.5 million, the repurchase of $15.2 million of our common stock and cash dividends paid of $10.5 million. These decreases were partially offset by net income of $34.1 million, net issuance of common stock under employee stock plans of $3.4 million, stock compensation expense of $674,000 and common stock issued under our dividend reinvestment plan of $332,000.

Economic conditions were significantly impacted by the COVID-19 pandemic in 2020; however, Texas still outperformed the nation in 2020, and our Fort Worth and Austin market areas have continued to perform generally better than many other parts of the country. Texas continues to experience economic growth due to in-migration from other states and company relocation from other states. Economists predict vaccines will drive strong economic growth in the second half of 2021.

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, the FRDW or the brokered funds market. These funds are invested primarily in U.S. agency MBS and long-term municipal 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 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 for many 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, increased interest rate risk, the length of interest rate cycles, changes in volatility or 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 the 2020 Form 10-K 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 and funding sources. The low 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 the securities portfolio, changes in our overall loan and deposit levels and changes in our wholesale funding levels.  Our balance sheet strategy is designed such that our securities portfolio should help mitigate financial performance associated with potential business and economic cycles that include slower loan growth and higher credit costs.

Our investment securities and U.S. Agency MBS decreased from $2.70 billion at December 31, 2020 to $2.65 billion at March 31, 2021. The decrease in the securities portfolio was primarily a result of the decline in the estimated fair value of the securities portfolio.

During the first quarter of 2021, the composition of the securities portfolio continued to change as U.S. Treasury Notes and, to a lesser extent, corporate and municipal bonds increased while MBS decreased. The decrease in MBS was attributable to higher MBS prepayment speeds due to the significantly low interest rate environment that was slightly offset by MBS purchases. During the first quarter of 2021, we increased security purchases when compared to the latter half of 2020, including $93 million in highly-rated primarily Texas municipal securities, $51.3 million of which were taxable, $14.3 million in investment grade subordinated debt, $800,000 in U.S. Agency MBS, and $42.8 million in U.S. Treasury Notes primarily due to the higher long-term interest rate environment. We sold approximately $35.1 million tax-free AFS electric utility revenue municipals due to uncertainty caused by the severe winter storm in Texas during February. Sales of AFS securities for the quarter ended March 31, 2021 resulted in a net realized gain of $2.0 million.

At March 31, 2021, securities as a percentage of assets totaled 37.8%, compared to 38.5% at December 31, 2020, due to the $51.2 million, or 1.9%, decrease in the securities portfolio. If loan growth, net of PPP loans, continues, we may modify our securities portfolio strategy. Our balance sheet management strategy is dynamic and is continually evaluated 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 invest in, as well as funding needs and funding sources, will continue to be evaluated.  Should the economics of purchasing securities decrease, we may allow the securities portfolio 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.

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With respect to liabilities, we continue to primarily utilize a combination of deposits and FHLB borrowings to achieve our strategy of minimizing cost while achieving overall interest rate risk objectives as well as the liability management objectives of the ALCO. Our primary wholesale funding source is FHLB borrowings and to a lesser extent we utilize federal funds purchased, the FRDW and brokered deposits.

For the three months ended March 31, 2021, our total wholesale funding as a percentage of deposits, not including brokered deposits, decreased to 14.9% from 20.2% at December 31, 2020, and 41.2% at March 31, 2020. The decrease for both the linked-quarter and prior year periods was due to the increase in our deposits and the decreases in FHLB borrowings and brokered deposits.

Our FHLB borrowings decreased 20.1%, or $167.0 million, to $665.5 million at March 31, 2021 from $832.5 million at December 31, 2020. In connection with our borrowings, the Bank has entered into various variable rate agreements and fixed rate short-term pay agreements. These agreements totaled $625.0 million and $670.0 million at March 31, 2021 and December 31, 2020, respectively. Six of the agreements have an interest rate tied to three-month LIBOR and the remaining agreements have interest rates tied to one-month LIBOR. In connection with all agreements outstanding on March 31, 2021, the Bank also entered into various interest rate swap contracts that are treated as cash flow hedges under ASC Topic 815, “Derivatives and Hedging” that are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the underlying LIBOR interest rate. The interest rate swap contracts had an average interest rate of 1.11% with an average weighted maturity of 3.8 years at March 31, 2021. 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 9 – 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 decreased $57.0 million, or 55.4%, from $102.8 million at December 31, 2020 to $45.9 million at March 31, 2021. At March 31, 2021, our brokered CDs had a weighted average cost of 15 basis points and remaining maturities of less than 18 months. To provide management flexibility in managing the interest rate risk of wholesale funding, the ALCO has approved up to $50.0 million to issue brokered deposits to replace those maturing within 30 days. Our wholesale funding policy allows for maximum brokered deposits of $450.0 million. This brokered deposit maximum limit could increase or decrease depending on changes in ALCO objectives. Potential higher interest expense and lack of customer loyalty are risks associated with the use of brokered CDs.

On November 6, 2020, the Company issued $100.0 million in aggregate principal amount of fixed-to-floating rate subordinated notes that mature on November 15, 2030. Refer to “Note 7 – Long-term Debt” in our consolidated financial statements included in this report for a detailed description of the terms of the subordinated notes.

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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 credit 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 adoption of CECL and the COVID-19 pandemic significantly impacted our results of operations in 2020 and may continue to impact our results of operations for the remainder of 2021.

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

	Three Months Ended
	March 31,
	2021		2020
Interest income:
Loans	$	36,038	$	41,895
Taxable investment securities	2,323		512
Tax-exempt investment securities	8,965		6,206
MBS	6,088		11,534
FHLB stock and equity investments	136		425
Other interest earning assets	15		180
Total interest income	53,565		60,752
Interest expense:
Deposits	2,597		9,919
FHLB borrowings	1,908		3,974
Subordinated notes	2,395		1,411
Trust preferred subordinated debentures	351		600
Other borrowings	11		147
Total interest expense	7,262		16,051
Net interest income	$	46,303	$	44,701

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 interest bearing liabilities.  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. During the first quarter of 2020, the Federal Reserve reduced target federal funds rate by 150 basis points to 25 basis points.

Net interest income for the three months ended March 31, 2021 increased $1.6 million, or 3.6%, to $46.3 million, compared to $44.7 million for the same period in 2020. The increase in net interest income for the three months ended March 31, 2021 was due to the decrease in interest expense on our interest bearing liabilities, a result of an overall decline in interest rates, partially offset by a decrease in interest income due to a lower yield on our interest earning assets. Total interest income decreased $7.2 million, or 11.8%, to $53.6 million for the three months ended March 31, 2021, compared to $60.8 million for the same period in 2020. Total interest expense decreased $8.8 million, or 54.8%, to $7.3 million for the three months ended March 31, 2021, compared to $16.1 million for the same period in 2020. Our net interest margin (FTE), a non-GAAP measure, increased to 3.20% for the three months ended March 31, 2021, compared to 3.03% for the same period in 2020, and our net interest spread (FTE), also a non-GAAP measure, increased to 3.03%, compared to 2.76% for the same period in 2020. See “Non-GAAP Financial Measures” for more information and for a reconciliation to GAAP.

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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 March 31, 2021 Compared to 2020
	Change Attributable to				Total
Fully Taxable-Equivalent Basis:	Average Volume		Average Yield/Rate		Change
Interest income on:
Loans (1)	$	550	$	(6,350)	$	(5,800)
Loans held for sale	15		(4)		11
Taxable investment securities	1,768		43		1,811
Tax-exempt investment securities (1)	3,545		(206)		3,339
Mortgage-backed and related securities	(4,353)		(1,093)		(5,446)
FHLB stock, at cost, and equity investments	(144)		(145)		(289)
Interest earning deposits	(33)		(132)		(165)
Federal funds sold	—		—		—
Total earning assets	1,348		(7,887)		(6,539)
Interest expense on:
Savings accounts	67		(95)		(28)
CDs	(2,136)		(2,981)		(5,117)
Interest bearing demand accounts	528		(2,705)		(2,177)
FHLB borrowings	(917)		(1,149)		(2,066)
Subordinated notes, net of unamortized debt issuance costs	1,226		(242)		984
Trust preferred subordinated debentures, net of unamortized debt issuance costs	—		(249)		(249)
Other borrowings	(63)		(73)		(136)
Total interest bearing liabilities	(1,295)		(7,494)		(8,789)
Net change	$	2,643	$	(393)	$	2,250

(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” for more information and for a reconciliation to GAAP.

The decrease in total interest income was attributable to the decrease in the average yield on earning assets to 3.67% for the three months ended March 31, 2021 from 4.06% for the same period in 2020, partially offset by the mix of average interest earning assets for the three months ended March 31, 2021, when compared to the same period in 2020. The decrease in the average yield on total earning assets during the three months ended March 31, 2021 was a result of decreases in the short-term interest rate yield curve during the first quarter of 2021 and the tightening credit spreads that occurred primarily during the last half of 2020 and into the first quarter of 2021. For the three months ended March 31, 2021, average earning assets decreased $7.3 million, or 0.1%, when compared to the same period in 2020.

The decrease in total interest expense for the three months ended March 31, 2021 was attributable to an overall decline in interest rates paid on total interest bearing liabilities to 0.64% for the three months ended March 31, 2021 from 1.30% for the same period in 2020, and the decrease in average interest bearing liabilities.    

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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 March 31, 2021 and 2020. 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 (Annualized)
	(unaudited)
	Three Months Ended
	March 31, 2021						March 31, 2020
	Average Balance		Interest		Average Yield/Rate		Average Balance		Interest		Average Yield/Rate
ASSETS
Loans (1)	$	3,634,053	$	36,754	4.10	%	$	3,587,143	$	42,554	4.77	%
Loans held for sale	2,803		20		2.89	%	831		9		4.36	%
Securities:
Taxable investment securities (2)	295,968		2,323		3.18	%	70,293		512		2.93	%
Tax-exempt investment securities (2)	1,300,991		11,176		3.48	%	888,906		7,837		3.55	%
Mortgage-backed and related securities (2)	940,815		6,088		2.62	%	1,598,374		11,534		2.90	%
Total securities	2,537,774		19,587		3.13	%	2,557,573		19,883		3.13	%
FHLB stock, at cost, and equity investments	35,635		136		1.55	%	62,976		425		2.71	%
Interest earning deposits	31,169		15		0.20	%	40,236		180		1.80	%
Total earning assets	6,241,434		56,512		3.67	%	6,248,759		63,051		4.06	%
Cash and due from banks	86,634						76,739
Accrued interest and other assets	677,230						611,017
Less:  Allowance for loan losses	(49,240)						(30,373)
Total assets	$	6,956,058					$	6,906,142
LIABILITIES AND SHAREHOLDERS’ EQUITY
Savings accounts	$	517,182	209		0.16	%	$	384,863	237		0.25	%
CDs	736,099		1,229		0.68	%	1,362,427		6,346		1.87	%
Interest bearing demand accounts	2,342,299		1,159		0.20	%	1,975,837		3,336		0.68	%
Total interest bearing deposits	3,595,580		2,597		0.29	%	3,723,127		9,919		1.07	%
FHLB borrowings	727,513		1,908		1.06	%	999,070		3,974		1.60	%
Subordinated notes, net of unamortized debt issuance costs	197,252		2,395		4.92	%	98,597		1,411		5.76	%
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,256		351		2.36	%	60,234		600		4.01	%
Other borrowings	23,522		11		0.19	%	69,846		147		0.85	%
Total interest bearing liabilities	4,604,123		7,262		0.64	%	4,950,874		16,051		1.30	%
Noninterest bearing deposits	1,389,020						1,042,341
Accrued expenses and other liabilities	89,222						88,168
Total liabilities	6,082,365						6,081,383
Shareholders’ equity	873,693						824,759
Total liabilities and shareholders’ equity	$	6,956,058					$	6,906,142
Net interest income (FTE)			$	49,250					$	47,000
Net interest margin (FTE)					3.20	%					3.03	%
Net interest spread (FTE)					3.03	%					2.76	%

(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 March 31, 2021 and 2020, loans totaling $5.3 million and $5.2 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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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.

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

	Three Months Ended March 31,				2021
					Change From
	2021		2020		2020
Deposit services	$	6,125	$	6,279	$	(154)	(2.5)	%
Net gain on sale of securities AFS	2,003		5,541		(3,538)		(63.9)	%
Gain on sale of loans	593		170		423		248.8	%
Trust fees	1,383		1,305		78		6.0	%
BOLI	626		569		57		10.0	%
Brokerage services	780		580		200		34.5	%
Other noninterest income	2,113		1,054		1,059		100.5	%
Total noninterest income	$	13,623	$	15,498	$	(1,875)	(12.1)	%

The 12.1% decrease in noninterest income for the three months ended March 31, 2021, when compared to the same period in 2020, was due to decreases in net gain on sale of securities AFS and deposit services income, partially offset by increases in other noninterest income, gain on sale of loans and brokerage services income.

The decrease in deposit services income for the three months ended March 31, 2021, was primarily the result of a decrease in overdraft income due to an increase in funds available to customers through government issued stimulus checks and PPP loans. The decrease was partially offset by an increase in debit card income.

During the three months ended March 31, 2021, we sold municipal securities that resulted in a net gain on sale of AFS securities of $2.0 million for the three months ended March 31, 2021.

Gain on sale of loans increased for the three months ended March 31, 2021, when compared to the same period in 2020, due to an increase in the volume of mortgage loans sold as overall mortgage loan production increased as a result of lower interest rates.

Brokerage services income increased for the three months ended March 31, 2021, when compared to the same period in 2020, due to growth in our client base and recurring revenue.

Other noninterest income increased for the three months ended March 31, 2021, when compared to the same period in 2020, primarily due to increases in mortgage servicing fee income and swap fee income, partially offset by decreases in mortgage derivative income and investment income.

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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 March 31,				2021
					Change From
	2021		2020		2020
Salaries and employee benefits	$	20,044	$	19,643	$	401	2.0	%
Net occupancy	3,560		3,311		249		7.5	%
Advertising, travel & entertainment	437		832		(395)		(47.5)	%
ATM expense	238		224		14		6.3	%
Professional fees	991		1,195		(204)		(17.1)	%
Software and data processing	1,312		1,227		85		6.9	%
Communications	525		493		32		6.5	%
FDIC insurance	454		25		429		1,716.0	%
Amortization of intangibles	766		980		(214)		(21.8)	%
Other noninterest expense	2,907		2,590		317		12.2	%
Total noninterest expense	$	31,234	$	30,520	$	714	2.3	%

The increase in noninterest expense for the three months ended March 31, 2021, when compared to the same period in 2020, was the result of increases in FDIC insurance, salaries and employee benefits, other noninterest expense and net occupancy expense, partially offset by decreases in advertising, travel and entertainment expense, amortization of intangibles and professional fees.

Salaries and employee benefits increased for the three months ended March 31, 2021, when compared to the same period in 2020, due to increases in direct salary expense, partially offset by decreases in health insurance and retirement expense.

For the three months ended March 31, 2021, direct salary expense increased $708,000, or 4.3%, when compared to the same period in 2020, primarily due to normal salary increases effective in the first quarter of 2021.

Retirement expense, included in salaries and employee benefits, decreased $79,000, or 7.2%, for the three months ended March 31, 2021, when compared to the same period in 2020. The decrease was due to the freeze of the defined benefit plan to further benefit accruals as of December 31, 2020, which resulted in no defined benefit plan expense in the first quarter of 2021. This decrease was partially offset by increases in our 401(k) plan matching expense, split dollar agreement expense and ESOP expense.

Health and life insurance expense, included in salaries and employee benefits, decreased $228,000, or 10.5%, for the three months ended March 31, 2021, when compared to the same period in 2020. We have a self-insured health plan which is supplemented with a stop loss insurance policy. Health insurance costs are rising nationwide and these costs may increase during the remainder of 2021.

Net occupancy expense increased during the three months ended March 31, 2021, when compared to the same period in 2020, due to increased rent expense, depreciation, repairs and other occupancy related expense primarily associated with relocating a branch location and branch remodels.

Advertising, travel and entertainment expense decreased during the three months ended March 31, 2021, when compared to the same period in 2020, primarily due to decreases in travel, meals and entertainment, and registration fees due to reduced activity resulting from COVID-19 travel restrictions, when compared to the same period in 2020. Donations, included in advertising, travel and entertainment, also decreased when compared to the same period in 2020.

Professional fees decreased for the three months ended March 31, 2021, when compared to the same period in 2020, due to several professional fees paid in connection with training, consulting and data conversion during the three months ended March 31, 2020.

FDIC insurance increased for the three months ended March 31, 2021, when compared to the same period in 2020, due to a small bank assessment credit issued by the FDIC and utilized in the first quarter of 2020.

Amortization of intangibles decreased for the three months ended March 31, 2021, when compared to the same period in 2020, due primarily to a decrease in core deposit intangible amortization which is recognized on an accelerated method resulting in a decline in expense over time.

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Other noninterest expense increased for the three months ended March 31, 2021, when compared to the same period in 2020, primarily due to losses on retired assets associated with branch remodels and an increase in computer supplies expense.

Income Taxes

Pre-tax income for the three months ended March 31, 2021 was $38.8 million, an increase of 776.4%, compared to $4.4 million for the same period in 2020. We recorded income tax expense of $4.8 million for the three months ended March 31, 2021, compared to income tax expense of $479,000 for the same period in 2020. The ETR as a percentage of pre-tax income was 12.2% for the three months ended March 31, 2021, compared to an ETR as a percentage of pre-tax income of 10.8% for the same period in 2020. The higher ETR for the three months ended March 31, 2021 was primarily due to a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same period in 2020.

The ETR differs from the statutory rate of 21% for the three months ended March 31, 2021 and 2020 primarily due to the effect of tax-exempt income from municipal loans and securities, as well as BOLI. The net deferred tax liability totaled $9.9 million at March 31, 2021, compared to $15.5 million at December 31, 2020. The decrease in the net deferred tax liability is primarily the result of the decrease in unrealized gains in the AFS securities portfolio.

See “Note 11 – Income Taxes” to our consolidated financial statements included in this report. No valuation allowance was recorded at March 31, 2021 or December 31, 2020, as management believes it is more likely than not that all of the deferred tax asset items will be realized in future years.

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Composition of Loans

One of our main objectives is to seek attractive lending opportunities in Texas, primarily in the market areas in which we operate. Refer to “Part I - Item 1. Business - Market Area” in the 2020 Form 10-K for a discussion of our primary market area and the geographic concentration of our loan portfolio as of December 31, 2020.  There were no substantial changes in these concentrations during the three months ended March 31, 2021.  The majority of our loan originations are made to borrowers who live in and/or conduct business in the market areas of 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, 2020		March 31, 2020
	March 31, 2021		December 31, 2020		March 31, 2020		Change (%)		Change (%)
Real estate loans:
Construction	$	605,677	$	581,941	$	603,952	4.1	%	0.3	%
1-4 family residential	700,430		719,952		787,875		(2.7)	%	(11.1)	%
Commercial	1,348,551		1,295,746		1,350,818		4.1	%	(0.2)	%
Commercial loans	564,745		557,122		383,984		1.4	%	47.1	%
Municipal loans	406,377		409,028		375,934		(0.6)	%	8.1	%
Loans to individuals	90,818		93,990		98,439		(3.4)	%	(7.7)	%
Total loans	$	3,716,598	$	3,657,779	$	3,601,002	1.6	%	3.2	%

Our loan portfolio increased $58.8 million, or 1.6%, at March 31, 2021 compared to December 31, 2020 with increases in commercial real estate loans, construction loans, and commercial loans, partially offset by decreases in the other loan categories. During the quarter, our PPP loans experienced a net increase of $6.0 million, or 2.8%, from $214.8 million at December 31, 2020, due to additional funding under the renewed Economic Aid Act, which was signed into law on December 27, 2020, partially offset by forgiveness payments received from loans funded under the CARES Act.

Our loan portfolio increased $115.6 million, or 3.2%, at March 31, 2021 compared to March 31, 2020. This increase was due to our origination of PPP loans, a component of the commercial loan category, with a balance of $220.9 million at March 31, 2021, offset largely by a decrease in our 1-4 family residential loans. There were no PPP loans outstanding at March 31, 2020.

At March 31, 2021, our real estate loans represented 71.4% of our loan portfolio and were comprised of commercial real estate loans of 50.8%, 1-4 family residential loans of 26.4% and construction loans of 22.8%. 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. Our 1-4 family residential loans consist primarily of loans secured by first mortgages on owner occupied 1-4 family residences. 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.

Loan Portfolios Most at Risk due to Economic Stress Resulting from Impact of COVID-19

The banking industry is affected by general economic conditions such as interest rates, inflation, recession, unemployment and other factors beyond our control, including the impact of the COVID-19 pandemic.  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. Oil prices have experienced a recovery for the three months ended March 31, 2021 following a significant reduction primarily reflective of the economic impact of COVID-19. We cannot predict whether current economic conditions or oil prices will improve, remain the same or decline.

As of March 31, 2021, the Company’s exposure to the oil and gas industry totaled $104.8 million, or 2.82% of gross loans, an increase of $229,000 from December 31, 2020, and consisted primarily of (i) support/service loans of 1.96%, (ii) upstream of 0.67%, (iii) midstream of 0.11%, and (iv) downstream of 0.08%. Expanded monitoring and analysis of these loans has been implemented to address the uncertainty in oil and gas prices as needed.

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The following table sets forth our loans outstanding in the oil and gas industry for the periods presented (dollars in thousands):

	March 31,						December 31, 2020
	2021			2020
Oil and gas related loans	$	104,777		$	102,938		$	104,548
Oil and gas related loans as a % of loans	2.82		%	2.86		%	2.86		%
Classified oil and gas related loans	$	5,237		$	765		$	6,385
Classified oil and gas related loans as a % of oil and gas related loans	5.00		%	0.74		%	6.11		%
Nonaccrual oil and gas related loans	$	728		$	—		$	620
Net charge-offs for oil and gas related loans	$	—		$	27		$	7
Allowance for oil and gas related loans as a % of oil and gas loans	1.35		%	2.17		%	1.36		%

The COVID-19 pandemic has negatively impacted the global economy, disrupted global supply chains and increased unemployment levels. The resulting temporary closure of many businesses and the implementation of social distancing and sheltering in place policies have impacted and could continue to impact many of our customers. As of March 31, 2021, most businesses in Texas are re-opened without restrictions. Commercial activity has improved but has not returned to the levels existing prior to the outbreak of the pandemic. In addition to the oil and gas industry, we consider the sectors set forth in the below table to be most vulnerable to financial risks from business disruptions caused by the pandemic mitigation efforts based on North American Industry Classification System categories as of March 31, 2021 (dollars in thousands). We recognize that these industries may take longer to recover as consumers may be hesitant to return to full social interaction or may change their spending habits on a more permanent basis as a result of the pandemic. We continue to monitor these customers closely.

	March 31, 2021
	Loans		Percent of  Total Loans		Percent Classified (1)
Retail commercial real estate (2)	$	323,729	8.71	%	0.02	%
Retail goods and services	74,662		2.01	%	9.47	%
Hotels	69,063		1.86	%	—
Food services	49,729		1.34	%	—
Arts, entertainment and recreation	8,580		0.23	%	2.73	%
Total	$	525,763	14.15	%	1.40	%

	December 31, 2020
	Loans		Percent of  Total Loans		Percent Classified (1)
Retail commercial real estate (2)	$	342,919	9.38	%	0.02	%
Retail goods and services	82,936		2.27	%	9.12	%
Hotels	69,578		1.90	%	—
Food services	35,502		0.97	%	—
Arts, entertainment and recreation	9,206		0.25	%	3.80	%
Total	$	540,141	14.77	%	1.48	%

	March 31, 2020
	Loans		Percent of  Total Loans		Percent Classified (1)
Retail commercial real estate (2)	$	322,341	8.95	%	0.35	%
Retail goods and services	88,019		2.45	%	8.79	%
Hotels	69,971		1.94	%	6.28	%
Food services	31,848		0.89	%	0.02	%
Arts, entertainment and recreation	8,373		0.23	%	1.02	%
Total	$	520,552	14.46	%	2.56	%

(1)    Sector classified loans as a percentage of sector total loans.

(2)    Loans in the retail commercial real estate sector are included in our commercial real estate portfolio.

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Allowance for Credit Losses - Loans

In accordance with ASC 326, the allowance for credit losses on loans is estimated and recognized upon origination of the loan based on expected credit losses. The CECL model uses historical experience and current conditions for homogeneous pools of loans, and reasonable and supportable forecasts about future events. The impact of varying economic conditions and portfolio stress factors are now a component of the credit loss models applied to each portfolio. Reserve factors are specific to the loan segments that share similar risk characteristics based on the probability of default assumptions and loss given default assumptions, over the contractual term. The forecasted periods gradually mean-revert to the long-run trend based upon historical data. Management evaluates the economic data points used in the Moody’s forecasting scenarios on a quarterly basis to determine the most appropriate impact to the various portfolio characteristics based on management’s view and applies weighting to various forecasting scenarios as deemed appropriate based on known and expected economic activities. Management also considers and may apply relevant qualitative factors, not previously considered, to determine the appropriate allowance level. The use of the CECL model includes significant judgment by management and may differ from those of our peers due to different historical loss patterns, economic forecasts, and the length of time of the reasonable and supportable forecast period and reversion period.

We utilize Moody’s Analytics economic forecast scenarios and assign probability weighting to those scenarios which best reflect management’s views on the economic forecast. The probability weighting and scenarios utilized for the estimate of the allowance were generally reflective of an improved economic forecast as based on known and knowable information as of March 31, 2021.

When determining the appropriate allowance for credit losses on our loan portfolio, our commercial construction and real estate loans, commercial loans and municipal loans utilize the probability of default/loss given default discounted cash flow approach. Reserves on these loans are based upon risk factors including the loan type and structure, collateral type, leverage ratio, refinancing risk and origination quality, among others. Our consumer construction real estate loans, 1-4 family residential loans and our loans to individuals use a loss rate based upon risk factors including loan types, origination year and credit scores. Loans covered by the PPP may be eligible for loan forgiveness. The remaining loan balance after forgiveness of any amount is still fully guaranteed by the SBA and therefore does not have an associated allowance.

Loans evaluated collectively in a pool are monitored to ensure they continue to exhibit similar risk characteristics with other loans in the pool. If a loan does not share similar risk characteristics with other loans, expected credit losses for that loan are evaluated individually.

As of March 31, 2021, our review of the loan portfolio indicated that an allowance for loan losses of $41.5 million was appropriate to cover expected losses in the portfolio.  Changes in economic and other conditions, including the application of the CECL model and the economic uncertainty related to COVID-19, may require future adjustments to the allowance for loan losses.

During the three months ended March 31, 2021, the allowance for loan losses decreased $7.6 million, or 15.4%, to $41.5 million, or 1.12% of total loans, when compared to $49.0 million, or 1.34% of total loans at December 31, 2020. The decrease in the allowance for credit losses for the first quarter of 2021 was primarily reflective of an improved economic forecast based on known and knowable information as of March 31, 2021.

For the three months ended March 31, 2021, loan charge-offs were $795,000 and recoveries were $622,000. For the three months ended March 31, 2020, loan charge-offs were $995,000 and recoveries were $451,000. We recorded a reversal of provision for credit losses for loans of $7.4 million for the three months ended March 31, 2021. This represented a decrease of $31.5 million, or 130.6%, from a provision $24.1 million for the three months ended March 31, 2020. The reversal of provision for credit losses during the three months ended March 31, 2021, was primarily due to improvement in the economic forecast in the first quarter of 2021 and its effect on macroeconomic factors used in the CECL model. The provision in the first quarter of 2020 was due to the estimated economic impact of COVID-19 on the macroeconomic factors, including the potential for credit deterioration.

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PCD Loans

We have purchased certain loans that as of the date of purchase have experienced more-than-insignificant deterioration in credit quality since origination. Management evaluates these loans against a probability threshold to determine if substantially all of the contractually required payments will be received. PCD loans are recorded at the purchase price plus an allowance for credit losses which becomes the PCD loan's initial amortized cost. The non-credit related discount or premium, the difference between the initial amortized cost and the par value, will be amortized into interest income over the life of the loan. Any further changes to the allowance for credit losses are recorded through provision expense. In accordance with the adoption of ASU 2016-13, management did not reassess whether PCI assets met the criteria of PCD assets and elected to not maintain pools of loans as of the date of adoption. All PCD loans are evaluated based upon product type within the underlying segment.

Nonperforming Assets

Nonperforming assets consist of delinquent loans 90 days or more past due, nonaccrual loans, OREO, repossessed assets and TDR 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 agreements.  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 represent loans that have been renegotiated to provide a below market interest rate or deferral of interest or principal because of deterioration in the financial position of the borrowers.  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.  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 are considered in judgments as to potential loan loss.

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

							Compared to
							December 31, 2020		March 31, 2020
	March 31, 2021		December 31, 2020		March 31, 2020		Change (%)		Change (%)
Loans on nonaccrual:
Real estate loans:
Construction	$	248	$	640	$	671	(61.3)	%	(63.0)	%
1-4 family residential	1,929		3,922		3,025		(50.8)	%	(36.2)	%
Commercial	1,229		1,269		742		(3.2)	%	65.6	%
Commercial loans	1,682		1,592		549		5.7	%	206.4	%
Loans to individuals	226		291		234		(22.3)	%	(3.4)	%
Total nonaccrual loans	5,314		7,714		5,221		(31.1)	%	1.8	%
Accruing loans past due more than 90 days	—		—		—		—		—
TDR loans	9,641		9,646		11,448		(0.1)	%	(15.8)	%
OREO	412		106		734		288.7	%	(43.9)	%
Repossessed assets	—		14		—		(100.0)	%	—
Total nonperforming assets	$	15,367	$	17,480	$	17,403	(12.1)	%	(11.7)	%

Ratio of nonaccruing loans to:
Total loans	0.14	%	0.21	%	0.14	%
Ratio of nonperforming assets to:
Total assets	0.22	%	0.25	%	0.24	%
Total loans	0.41	%	0.48	%	0.48	%
Total loans and OREO	0.41	%	0.48	%	0.48	%
Total loans, excluding PPP loans, and OREO	0.44	%	0.51	%	0.48	%
Ratio of allowance for loan losses to:
Nonaccruing loans	780.09	%	635.29	%	1,027.35	%
Nonperforming assets	269.76	%	280.35	%	308.21	%
Total loans	1.12	%	1.34	%	1.49	%
Total loans, excluding PPP loans	1.19	%	1.42	%	1.49	%
Net charge-offs to average loans outstanding	0.02	%	0.03	%	0.06	%

We are actively marketing all OREO properties and none are being held for investment purposes.

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Liquidity and Interest Rate Sensitivity

Liquidity management involves our ability to convert assets to cash with minimum risk of loss while enabling 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 lines and letters of credit; and (3) the short-term credit needs of customers.  Liquidity is provided by cash, interest earning deposits and short-term investments that can be readily liquidated with a minimum risk of loss.  At March 31, 2021, these investments were 6.6% of total assets, as compared with 7.4% for December 31, 2020 and 6.5% for March 31, 2020. The decrease to 6.6% at March 31, 2021 as compared to December 31, 2020, is reflective of the decrease in the short-term investment portfolio while the increase as compared to March 31, 2020, is reflective of the decrease in total assets. Liquidity is further provided through the matching, by time period, of rate sensitive interest earning assets with rate sensitive interest bearing liabilities.  The 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 March 31, 2021 or December 31, 2020.  To provide more liquidity in response to the economic impact of the COVID-19 pandemic, the Federal Reserve took steps to encourage broader use of the discount window. At March 31, 2021, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities and PPP loans, was approximately $618.1 million. There were no borrowings from the FRDW at March 31, 2021 or December 31, 2020. At March 31, 2021, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by securities, FHLB stock and nonspecified loans and securities, was approximately $1.25 billion, net of FHLB stock purchases required.  The Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit, and at March 31, 2021, the line had one outstanding letter of credit for $91,000. The Bank currently has no outstanding letters of credit from FHLB held as collateral for its public fund deposits.

Management continually evaluates our liquidity position and currently believes the Company has adequate funding to meet our financial needs. During March 2020, in response to COVID-19, the Federal Reserve lowered the primary credit rate by 150 basis points to 0.25 percent and extended terms to 90 days to enhance market liquidity and encourage use of the discount window. In addition, the Federal Reserve announced it would begin quantitative easing, or large-scale asset purchases, consisting primarily of U.S. Treasury securities and MBS to stem the effects of the pandemic on the financial markets. Failure to contain the COVID-19 pandemic could cause a widespread liquidity crisis, and the availability of these funds or the options to sell securities currently held could be hindered.

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 MVPE 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.

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Capital Resources

Our total shareholders’ equity at March 31, 2021 decreased 1.9%, or $16.7 million, to $858.6 million, or 12.3% of total assets, compared to $875.3 million, or 12.5% of total assets, at December 31, 2020. The decrease in shareholders’ equity was the result of other comprehensive losses of $29.5 million, the repurchase of $15.2 million of our common stock and cash dividends paid of $10.5 million. These decreases were partially offset by net income of $34.1 million, net issuance of common stock under employee stock plans of $3.4 million, stock compensation expense of $674,000 and common stock issued under our dividend reinvestment plan of $332,000.    

The Company’s Common Equity Tier 1 capital includes common stock and related paid-in capital, net of treasury stock, and retained earnings. The Bank’s Common Equity Tier 1 capital includes common stock and related paid-in capital, and retained earnings. In connection with the adoption of the Basel III Capital Rules, we elected to opt-out of the requirement to include accumulated other comprehensive income in Common Equity Tier 1. We also elected, for a five-year transitional period, the effects of credit loss accounting under CECL from Common Equity Tier 1, as further discussed below. Common Equity Tier 1 for both the Company and the Bank is reduced by goodwill and other intangible assets, net of associated deferred tax liabilities.

Tier 1 capital includes Common Equity Tier 1 capital and additional Tier 1 capital. For the Company, additional Tier 1 capital at March 31, 2021 included $58.4 million of trust preferred securities. For bank holding companies that had assets of less than $15 billion as of December 31, 2009, 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. The Bank did not have any additional Tier 1 capital beyond Common Equity Tier 1 at March 31, 2021.

Total capital includes Tier 1 capital and Tier 2 capital. Tier 2 capital for both the Company and the Bank includes a permissible portion of the allowance for credit losses on loans and off-balance sheet exposures. Tier 2 capital for the Company also includes $197.3 million of qualified subordinated debt as of March 31, 2021. The permissible portion of qualified subordinated notes decreases 20% per year during the final five years of the term of the notes.

In April 2020, the FDIC, Federal Reserve, and the Office of the Comptroller of the Currency issued supplemental instructions allowing banking organizations that implement CECL before the end of 2020, the option to delay for two years an estimate of the CECL methodologies’ effect on regulatory capital, relative to the incurred loss methodologies effect on capital, followed by a three-year transition period.  We elected to adopt the five-year transition option. Accordingly, a CECL transitional amount totaling $10.0 million has been added back to CET1 as of March 31, 2021. The CECL transitional amount includes $7.8 million related to a cumulative effect of adopting CECL and $2.2 million related to the estimated incremental effect of CECL since adoption.

Also in April 2020, we began originating loans to qualified small businesses under the PPP administered by the SBA. Federal bank regulatory agencies have issued an interim final rule that permits banks to neutralize the regulatory capital effects of participating in the Paycheck Protection Program Lending Facility and clarify that PPP loans have a zero percent risk weight under applicable risk-based capital rules. Specifically, a bank may exclude all PPP loans pledged as collateral to the PPP Facility from its average total consolidated assets for the purposes of calculating its leverage ratio, while PPP loans that are not pledged as collateral to the PPP Facility will be included. Our PPP loans are included in the calculation of our leverage ratio as of March 31, 2021, as we did not utilize the PPP Facility for funding purposes.

Management believes that, as of March 31, 2021, we met all capital adequacy requirements to which we were subject. 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.

Southside Bancshares, Inc. |60

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 (dollars in thousands):

	Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Actions Provisions
March 31, 2021	Amount		Ratio		Amount		Ratio		Amount		Amount
Common Equity Tier 1 (to Risk-Weighted Assets)
Consolidated	$	623,603	14.71	%	$	190,741	4.50	%	N/A		N/A
Bank Only	$	803,884	18.97	%	$	190,726	4.50	%	$	275,494	6.50	%
Tier 1 Capital (to Risk-Weighted Assets)
Consolidated	$	682,048	16.09	%	$	254,322	6.00	%	N/A		N/A
Bank Only	$	803,884	18.97	%	$	254,302	6.00	%	$	339,069	8.00	%
Total Capital (to Risk-Weighted Assets)
Consolidated	$	912,092	21.52	%	$	339,096	8.00	%	N/A		N/A
Bank Only	$	836,660	19.74	%	$	339,069	8.00	%	$	423,837	10.00	%
Tier 1 Capital (to Average Assets) (1)
Consolidated	$	682,048	10.29	%	$	265,109	4.00	%	N/A		N/A
Bank Only	$	803,884	12.13	%	$	265,013	4.00	%	$	331,266	5.00	%

	Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Actions Provisions
December 31, 2020	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common Equity Tier 1 (to Risk-Weighted Assets)
Consolidated	$	612,703	14.68	%	$	187,814	4.50	%	N/A		N/A
Bank Only	$	768,200	18.41	%	$	187,801	4.50	%	$	271,268	6.50	%
Tier 1 Capital (to Risk-Weighted Assets)
Consolidated	$	671,147	16.08	%	$	250,418	6.00	%	N/A		N/A
Bank Only	$	768,200	18.41	%	$	250,402	6.00	%	$	333,869	8.00	%
Total Capital (to Risk-Weighted Assets)
Consolidated	$	908,873	21.78	%	$	333,891	8.00	%	N/A		N/A
Bank Only	$	808,675	19.38	%	$	333,869	8.00	%	$	417,336	10.00	%
Tier 1 Capital (to Average Assets) (1)
Consolidated	$	671,147	9.81	%	$	273,558	4.00	%	N/A		N/A
Bank Only	$	768,200	11.24	%	$	273,432	4.00	%	$	341,790	5.00	%

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

As of March 31, 2021, Southside Bancshares and Southside Bank met all capital adequacy requirements under the Basel III Capital Rules that became fully phased-in as of January 1, 2019. Refer to the Supervision and Regulation section in the 2020 Form 10-K for further discussion of our capital requirements.

Southside Bancshares, Inc. |61

The table below summarizes our key equity ratios for the periods presented:

	Three Months Ended March 31,
	2021		2020
Return on average assets	1.99	%	0.23	%
Return on average shareholders’ equity	15.82	%	1.93	%
Dividend payout ratio – Basic	30.77	%	258.33	%
Dividend payout ratio – Diluted	30.77	%	258.33	%
Average shareholders’ equity to average total assets	12.56	%	11.94	%

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. The allowance for credit losses on these off-balance-sheet credit exposures is calculated using the same methodology as loans including conversion or usage factor to anticipate ultimate exposure and expected losses and is included in other liabilities on our consolidated balance sheets.

Allowance for off-balance-sheet credit exposures were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Balance at beginning of period	$	6,386	$	1,455
Impact of CECL adoption	—		4,840
Provision for (reversal of) off-balance-sheet credit exposures	(2,770)		1,165
Balance at end of period	$	3,616	$	7,460

Commitments to extend credit are agreements to lend to a customer provided that the terms established in the contract are met. Commitments to extend credit 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 commitments to extend credit and similarly do not necessarily represent future cash obligations.

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

	March 31, 2021		December 31, 2020
Unused commitments:
Commitments to extend credit	$	811,574	$	793,138
Standby letters of credit	10,825		13,658
Total	$	822,399	$	806,796

We apply the same credit policies in making commitments to extend credit 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.

Southside Bancshares, Inc. |62

Leases. During the three months ended March 31, 2021, there was $1.1 million of operating lease ROU assets obtained in exchange for new operating lease liabilities, primarily due to one lease that commenced in January 2021 with an initial right-of-use asset of $1.1 million. There was $227,000 of operating lease right-of-use assets obtained in exchange for new operating lease liabilities for the three months ended March 31, 2020.

Securities. In the normal course of business we buy and sell securities. At March 31, 2021, there were $23.5 million of unsettled trades to purchase securities and no unsettled trades to sell securities. At December 31, 2020, there were no unsettled trades to purchase securities and no unsettled trades to sell securities.

Deposits. There were no unsettled issuances of brokered CDs at March 31, 2021 or December 31, 2020.

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.

Southside Bancshares, Inc. |63

Expansion

On April 12, 2021, we opened a loan production office in Harris County, in Houston’s Uptown District.

Branch Closures

On March 19, 2021, we closed two retail branch locations in Longview and Tyler, that were in close proximity to other Southside branches, and a traditional branch location in Flower Mound. These closures were also driven by a shift in customer preferences and their transition from in-branch banking to digital.

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.

Subsequent Events

Subsequent to March 31, 2021 and through April 27, 2021, we purchased 90,884 shares of common stock at an average price of $38.49 pursuant to the Stock Repurchase Plan.

Southside Bancshares, Inc. |64

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 Risk” in the 2020 Form 10-K.  

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 monetary control efforts, the effects of deregulation, 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 50 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.  The model has interest rate floors, and no interest rates are assumed to go negative. The interest rate environment declined during 2020 to a point where most treasury terms were under 100 basis points; therefore, we do not believe an analysis of an assumed decrease in interest rates beyond 50 basis points would provide meaningful results. We will continue to monitor interest rates, and we will resume the simulation of rates decreasing 100 and 200 basis points once rates begin to rise.

The following table reflects the noted increases and decreases in interest rates under the model simulations and the anticipated impact on net interest income relative to the base case over the next 12 months for the periods presented.

	Anticipated impact over the next 12 months
	March 31,
Rate projections:	2021		2020
Increase:
100 basis points	3.15	%	1.24	%
200 basis points	6.85	%	(1.27)	%
Decrease:
50 basis points	(2.15)	%	(1.79)	%
100 basis points	N/A		(5.91)	%
200 basis points	N/A		(8.45)	%

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.

In addition to interest rate risk, beginning in 2020, the COVID-19 pandemic exposed us and will likely continue to expose us to additional market value risk. Protracted business closures, furloughs and lay-offs have curtailed economic activity, and will likely continue to curtail economic activity and could result in lower fair values for collateral in our commercial and 1-4 family portfolio segments.

Southside Bancshares, Inc. |65

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 model, 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.

Southside Bancshares, Inc. |66

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 March 31, 2021 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

There have been no material changes in the risk factors previously disclosed in the 2020 Form 10-K.

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

Issuer Purchases of Equity Securities

On September 5, 2019, our board of directors authorized the repurchase of up to 1.0 million shares of common stock under the Stock Repurchase Plan. On March 12, 2020, our board of directors increased the authorization under the Stock Repurchase Plan by an additional 1.0 million shares, for a total authorization to repurchase up to 2.0 million shares. Repurchases may be carried out in open market purchases, privately negotiated transactions and pursuant to any trading plan that might be adopted in accordance with Rule 10b5-1 of the Exchange Act. We have no obligation to repurchase any shares under the Stock Repurchase Plan and may modify, suspend or discontinue the plan at any time.

The following table provides information with respect to purchases made by or on behalf of any “affiliated purchaser” (as defined in Rule 10b-18(a)(3) under the Exchange Act), of our common stock during the three months ended March 31, 2021:

Period	Total Number of  Shares Purchased	Average Price Paid  Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan	Maximum Number of Shares That May Yet Be Purchased Under the Stock Repurchase Plan at the End of the Period
January 1, 2021 - January 31, 2021	14,857	$	30.99	14,857	923,627
February 1, 2021 - February 28, 2021	226,450	33.72		226,450	697,177
March 1, 2021 - March 31, 2021	186,089	38.25		186,089	511,088
Total	427,396	$	35.60	427,396

Subsequent to March 31, 2021 and through April 27, 2021, we purchased 90,884 shares of common stock at an average price of $38.49 pursuant to the Stock Repurchase Plan.

Southside Bancshares, Inc. |67

ITEM 3.    DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4.    MINE SAFETY DISCLOSURES

None.

ITEM 5.    OTHER INFORMATION

None.

Southside Bancshares, Inc. |68

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
(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 - the instance document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL document.	X
101.SCH	Inline XBRL Taxonomy Extension Schema Document.	X
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document.	X
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document.	X
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document.	X
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.	X
104	Cover Page Interactive Data File (embedded within the Inline XBRL 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.

Southside Bancshares, Inc. |69

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:	April 30, 2021	BY:	/s/ Lee R. Gibson
			Lee R. Gibson, CPA
			President and Chief Executive Officer
			(Principal Executive Officer)
DATE:	April 30, 2021	BY:	/s/ Julie N. Shamburger
			Julie N. Shamburger, CPA
			Chief Financial Officer
			(Principal Financial and Accounting Officer)

Southside Bancshares, Inc. |70

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:	April 30, 2021	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:	April 30, 2021	By:	/s/ JULIE N. SHAMBURGER
			Julie N. Shamburger, CPA
			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 March 31, 2021 (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:	April 30, 2021	By:	/s/ LEE R. GIBSON
			Lee R. Gibson, CPA
			President and Chief Executive Officer
Date:	April 30, 2021	By:	/s/ JULIE N. SHAMBURGER
			Julie N. Shamburger, CPA
			Chief Financial Officer

XML

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 27, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	000-12247
Entity Registrant Name	SOUTHSIDE BANCSHARES, INC.
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	75-1848732
Entity Address, Address Line One	1201 S. Beckham Avenue,
Entity Address, City or Town	Tyler,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75701
City Area Code	903
Local Phone Number	531-7111
Title of 12(b) Security	Common Stock, $1.25 par value
Trading Symbol	SBSI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		32,588,244
Entity Central Index Key	0000705432
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)		Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks		$ 78,304,000	$ 87,357,000
Interest earning deposits		29,319,000	21,051,000
Total cash and cash equivalents		107,623,000	108,408,000
Securities AFS, at estimated fair value (amortized cost of $2,448,113 and $2,437,513, respectively)		2,546,924,000	2,587,305,000
Securities HTM (estimated fair value of $104,177 and $118,198, respectively)		98,159,000	108,998,000
FHLB stock, at cost		18,754,000	25,259,000
Equity investments		11,804,000	11,905,000
Loans held for sale		2,615,000	3,695,000
Loans:
Loans		3,716,598,000	3,657,779,000
Less: Allowance for loan losses		(41,454,000)	(49,006,000)
Net loans		3,675,144,000	3,608,773,000
Premises and equipment, net		144,628,000	144,576,000
Operating lease ROU assets		15,788,000	15,063,000
Goodwill		201,116,000	201,116,000
Other intangible assets, net		8,978,000	9,744,000
Interest receivable		27,438,000	38,708,000
BOLI		116,209,000	115,583,000
Other assets		23,706,000	29,094,000
Total assets		6,998,886,000	7,008,227,000
Deposits:
Noninterest bearing		1,383,371,000	1,354,815,000
Interest bearing		3,709,272,000	3,577,507,000
Total deposits		5,092,643,000	4,932,322,000
Other borrowings		22,315,000	23,172,000
FHLB borrowings		665,530,000	832,527,000
Subordinated notes, net of unamortized debt issuance costs	[1]	197,268,000	197,251,000
Trust preferred subordinated debentures, net of unamortized debt issuance costs		60,256,000	60,255,000
Deferred tax liability, net		9,869,000	15,549,000
Unsettled trades to purchase securities		23,473,000	0
Operating lease liabilities		17,327,000	16,734,000
Other liabilities		51,608,000	55,120,000
Total liabilities		6,140,289,000	6,132,930,000
Off-balance-sheet arrangements, commitments and contingencies (Note 12)
Shareholders’ equity:
Common stock:  ($1.25 par value, 80,000,000 shares authorized, 37,943,737 shares issued at March 31, 2021 and 37,934,819 shares issued at December 31, 2020)		47,430,000	47,419,000
Paid-in capital		774,815,000	771,511,000
Retained earnings		134,782,000	111,208,000
Treasury stock: (shares at cost, 5,284,781 at March 31, 2021 and 4,983,645 at December 31, 2020)		(138,016,000)	(123,921,000)
AOCI		39,586,000	69,080,000
Total shareholders’ equity		858,597,000	875,297,000
Total liabilities and shareholders’ equity		$ 6,998,886,000	$ 7,008,227,000

[1] This debt consists of subordinated notes with a remaining maturity greater than one year that qualify under the risk-based capital guidelines as Tier 2 capital, subject to certain limitations.

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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale [Abstract]
Securities available for sale, amortized cost	$ 2,448,113	$ 2,437,513
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held to maturity, fair value	$ 104,177	$ 118,198
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	80,000,000	80,000,000
Common stock, shares issued (in shares)	37,943,737	37,934,819
Treasury stock (in shares)	5,284,781	4,983,645

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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income:
Loans	$ 36,038	$ 41,895
Taxable investment securities	2,323	512
Tax-exempt investment securities	8,965	6,206
MBS	6,088	11,534
FHLB stock and equity investments	136	425
Other interest earning assets	15	180
Total interest income	53,565	60,752
Interest expense:
Deposits	2,597	9,919
FHLB borrowings	1,908	3,974
Subordinated notes	2,395	1,411
Trust preferred subordinated debentures	351	600
Other borrowings	11	147
Total interest expense	7,262	16,051
Net interest income	46,303	44,701
Provision for credit losses	(10,149)	25,247
Net interest income after provision for credit losses	56,452	19,454
Noninterest income:
Deposit services	6,125	6,279
Net gain on sale of securities AFS	2,003	5,541
Gain on sale of loans	593	170
Trust fees	1,383	1,305
BOLI	626	569
Brokerage services	780	580
Other	2,113	1,054
Total noninterest income	13,623	15,498
Noninterest expense:
Salaries and employee benefits	20,044	19,643
Net occupancy	3,560	3,311
Advertising, travel & entertainment	437	832
ATM expense	238	224
Professional fees	991	1,195
Software and data processing	1,312	1,227
Communications	525	493
FDIC insurance	454	25
Amortization of intangibles	766	980
Other	2,907	2,590
Total noninterest expense	31,234	30,520
Income before income tax expense	38,841	4,432
Income tax expense	4,750	479
Net income	$ 34,091	$ 3,953
Earnings per common share - basic (in dollars per share)	$ 1.04	$ 0.12
Earnings per common share - diluted (in dollars per share)	1.04	0.12
Cash dividends paid per common share (in dollars per share)	$ 0.32	$ 0.31

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 34,091	$ 3,953
Securities AFS and transferred securities:
Change in unrealized holding (loss) gain on AFS securities during the period	(48,979)	61,486
Reclassification adjustment for amortization related to AFS and HTM debt securities	416	121
Reclassification adjustment for net gain on sale of AFS securities, included in net income	(2,003)	(5,541)
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	11,023	(19,600)
Reclassification adjustment of net loss (gain) related to derivatives designated as cash flow hedges	1,568	(101)
Pension plans:
Amortization of net actuarial loss and prior service credit, included in net periodic benefit cost	641	727
Other comprehensive (loss) income, before tax	(37,334)	37,092
Income tax benefit (expense) related to items of other comprehensive (loss) income	7,840	(7,789)
Other comprehensive (loss) income, net of tax	(29,494)	29,303
Comprehensive income	$ 4,597	$ 33,256

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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)	Cumulative effect of accounting change	Cumulative effect of accounting change Retained Earnings	Adjusted beginning balance	Adjusted beginning balance Common Stock	Adjusted beginning balance Paid In Capital	Adjusted beginning balance Retained Earnings	Adjusted beginning balance Treasury Stock	Adjusted beginning balance Accumulated Other Comprehensive Income (Loss)
Beginning balance, net of tax at Dec. 31, 2019	$ 804,580	$ 47,360	$ 766,718	$ 80,274	$ (94,008)	$ 4,236	$ (7,830)	$ (7,830)	$ 796,750	$ 47,360	$ 766,718	$ 72,444	$ (94,008)	$ 4,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,953			3,953
Other comprehensive (loss) income	29,303					29,303
Issuance of common stock for dividend reinvestment plan	347	13	334
Purchase of common stock	(25,842)				(25,842)
Stock compensation expense	695		695
Net issuance of common stock under employee stock plans	1,088		693	(40)	435
Cash dividends paid on common stock	(10,494)			(10,494)
Ending balance, net of tax at Mar. 31, 2020	795,800	47,373	768,440	65,863	(119,415)	33,539
Beginning balance, net of tax at Dec. 31, 2020	875,297	47,419	771,511	111,208	(123,921)	69,080
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	34,091			34,091
Other comprehensive (loss) income	(29,494)					(29,494)
Issuance of common stock for dividend reinvestment plan	332	11	321
Purchase of common stock	(15,213)				(15,213)
Stock compensation expense	674		674
Net issuance of common stock under employee stock plans	3,386		2,309	(41)	1,118
Cash dividends paid on common stock	(10,476)			(10,476)
Ending balance, net of tax at Mar. 31, 2021	$ 858,597	$ 47,430	$ 774,815	$ 134,782	$ (138,016)	$ 39,586

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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for dividend reinvestment plan (in shares)	8,918	10,607
Common stock purchased (in shares)	427,396	869,723
Net issuance of common stock under employee stock plans (in shares)	126,260	47,428
Cash dividends paid on common stock (in dollars per share)	$ 0.32	$ 0.31

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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
OPERATING ACTIVITIES:
Net income	$ 34,091,000	$ 3,953,000
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	2,882,000	3,021,000
Securities premium amortization (discount accretion), net	6,083,000	4,505,000
Loan (discount accretion) premium amortization, net	(223,000)	(244,000)
Provision for credit losses	(10,149,000)	25,247,000
Stock compensation expense	674,000	695,000
Deferred tax expense (benefit)	2,161,000	(5,075,000)
Net gain on sale of AFS securities	(2,003,000)	(5,541,000)
Net (gain) loss on premises and equipment	227,000	(42,000)
Gross proceeds from sales of loans held for sale	15,987,000	5,204,000
Gross originations of loans held for sale	(14,907,000)	(6,651,000)
Net (gain) loss on OREO	(2,000)	1,000
Net change in:
Interest receivable	11,270,000	1,383,000
Other assets	6,459,000	(9,318,000)
Interest payable	(1,026,000)	(2,034,000)
Other liabilities	10,891,000	(18,886,000)
Net cash provided by (used in) operating activities	62,415,000	(3,782,000)
Securities AFS:
Purchases	(127,713,000)	(683,062,000)
Sales	37,097,000	135,000,000
Maturities, calls and principal repayments	99,787,000	80,555,000
Securities HTM:
Maturities, calls and principal repayments	10,871,000	352,000
Proceeds from redemption of FHLB stock and equity investments	16,240,000	0
Purchases of FHLB stock and equity investments	(9,629,000)	(4,661,000)
Net loan originations	(59,211,000)	(33,207,000)
Purchases of premises and equipment	(2,396,000)	(4,259,000)
Proceeds from sales of premises and equipment	94,000	72,000
Proceeds from sales of OREO	106,000	46,000
Proceeds from sales of repossessed assets	44,000	31,000
Net cash used in investing activities	(34,710,000)	(509,133,000)
FINANCING ACTIVITIES:
Net change in deposits	160,308,000	56,281,000
Net change in other borrowings	(857,000)	189,542,000
Proceeds from FHLB borrowings	4,009,977,000	3,247,401,000
Repayment of FHLB borrowings	(4,176,974,000)	(2,945,775,000)
Net proceeds from issuance of subordinated long-term debt	(59,000)	0
Proceeds from stock option exercises	3,412,000	1,130,000
Cash paid to tax authority related to tax withholding on share-based awards	(26,000)	(42,000)
Purchase of common stock	(14,127,000)	(23,959,000)
Proceeds from the issuance of common stock for dividend reinvestment plan	332,000	347,000
Cash dividends paid	(10,476,000)	(10,494,000)
Net cash (used in) provided by financing activities	(28,490,000)	514,431,000
Net (decrease) increase in cash and cash equivalents	(785,000)	1,516,000
Cash and cash equivalents at beginning of period	108,408,000	110,697,000
Cash and cash equivalents at end of period	107,623,000	112,213,000
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	8,288,000	18,085,000
Income taxes paid	250,000	0
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	424,000	338,000
Unsettled trades to purchase securities	(23,473,000)	(14,596,000)
Unsettled trades to sell securities	0	67,247,000
Unsettled trades to repurchase common stock	$ (1,086,000)	$ (1,883,000)

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Summary of Significant Accounting and Reporting Policies

3 Months Ended

Mar. 31, 2021

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, including Southside Bank.  The words “Southside” and “Southside Bancshares” refer to Southside Bancshares, Inc.  The words “Southside Bank” and “the Bank” refer to Southside Bank.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. 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, 2020. 

Accounting Changes and Reclassifications

Certain prior period amounts may be reclassified to conform to current year presentation.

Accounting Pronouncements

In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” ASU 2020-04 is intended to provide relief for companies preparing for discontinuation of interest rates based on LIBOR. The ASU provides optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or other reference rates expected to be discontinued. ASU 2020-04 also provides for a one-time sale and/or transfer to AFS or trading to be made for HTM debt securities that both reference an eligible reference rate and were classified as HTM before January 1, 2020. ASU 2020-04 was effective for all entities as of March 12, 2020 and through December 31, 2022. Companies can apply the ASU as of the beginning of the interim period that includes March 12, 2020 or any date thereafter. The guidance requires companies to apply the guidance prospectively to contract modifications and hedging relationships while the one-time election to sell and/or transfer debt securities classified as HTM may be made any time after March 12, 2020. We have established an officer level committee to guide our transition from LIBOR and have begun efforts to transition to alternative rates consistent with industry timelines. We have identified products that utilize LIBOR and are implementing enhanced fallback language to facilitate the transition to alternative reference rates. We are evaluating existing systems and have begun offering new rates on a limited basis. ASU 2020-04 is not expected to have a material impact on our consolidated financial statements.

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Earnings Per Share

3 Months Ended

Mar. 31, 2021

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 March 31,
	2021		2020
Basic and Diluted Earnings:
Net income	$	34,091	$	3,953
Basic weighted-average shares outstanding	32,829		33,691
Add:  Stock awards	108		114
Diluted weighted-average shares outstanding	32,937		33,805
Basic earnings per share:
Net income	$	1.04	$	0.12
Diluted earnings per share:
Net income	$	1.04	$	0.12

For the three months ended March 31, 2021, and 2020 there were approximately 679,000 and 775,000 anti-dilutive shares, respectively.

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021
					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	$	116,078	$	(17,091)	$	149	$	(30,056)	$	69,080
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(48,979)		11,023		—		—		(37,956)
Reclassification adjustments included in net income	(1,587)		1,568		—		641		622
Income tax benefit (expense)	10,619		(2,644)		—		(135)		7,840
Net current-period other comprehensive (loss) income, net of tax	(39,947)		9,947		—		506		(29,494)
Ending balance, net of tax	$	76,131	$	(7,144)	$	149	$	(29,550)	$	39,586

	Three Months Ended March 31, 2020
					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	$	38,038	$	(1,672)	$	(145)	$	(31,985)	$	4,236
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	61,486		(19,600)		—		—		41,886
Reclassification adjustments included in net income	(5,420)		(101)		(1)		728		(4,794)
Income tax (expense) benefit	(11,774)		4,137		—		(152)		(7,789)
Net current-period other comprehensive income (loss), net of tax	44,292		(15,564)		(1)		576		29,303
Ending balance, net of tax	$	82,330	$	(17,236)	$	(146)	$	(31,409)	$	33,539

The reclassification adjustments out of accumulated other comprehensive income (loss) included in net income are presented below (in thousands):

	Three Months Ended March 31,
	2021		2020
Unrealized gains and losses on securities transferred:
Amortization of unrealized gains and losses (1)	$	(416)	$	(121)
Tax benefit	87		25
Net of tax	(329)		(96)
Unrealized gains and losses on available for sale securities:
Realized net gain on sale of securities (2)	2,003		5,541
Tax expense	(420)		(1,164)
Net of tax	1,583		4,377
Derivatives:
Realized net (loss) gain on interest rate swap derivatives (3)	(1,568)		93
Tax benefit (expense)	329		(19)
Net of tax	(1,239)		74
Amortization of unrealized gains on terminated interest rate swap derivatives (3)	—		8
Tax expense	—		(1)
Net of tax	—		7
Amortization of pension plan:
Net actuarial loss (4)	(641)		(728)
Prior service credit (4)	—		1
Total before tax	(641)		(727)
Tax benefit	135		152
Net of tax	(506)		(575)
Total reclassifications for the period, net of tax	$	(491)	$	3,787

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

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

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

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

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Securities

3 Months Ended

Mar. 31, 2021

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 AFS and HTM securities as of March 31, 2021 and December 31, 2020 are reflected in the tables below (in thousands):

	March 31, 2021
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
U.S. Treasury	$	42,818	$	8	$	349	$	42,477
State and political subdivisions	1,528,516		71,813		8,684		1,591,645
Other stocks and bonds	91,439		1,560		216		92,783
MBS: (1)
Residential	675,795		31,580		301		707,074
Commercial	109,545		3,802		402		112,945
Total	$	2,448,113	$	108,763	$	9,952	$	2,546,924
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	908	$	9	$	—	$	917
MBS: (1)
Residential	45,274		3,006		—		48,280
Commercial	51,977		3,003		—		54,980
Total	$	98,159	$	6,018	$	—	$	104,177

	December 31, 2020
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
State and political subdivisions	$	1,475,030	$	105,601	$	37	$	1,580,594
Other stocks and bonds	77,224		1,053		22		78,255
MBS: (1)
Residential	771,409		38,674		73		810,010
Commercial	113,850		4,746		150		118,446
Total	$	2,437,513	$	150,074	$	282	$	2,587,305
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	907	$	13	$	—	$	920
MBS: (1)
Residential	47,948		4,187		—		52,135
Commercial	60,143		5,000		—		65,143
Total	$	108,998	$	9,200	$	—	$	118,198

(1) All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

Investment securities and MBS with carrying values of $1.47 billion and $1.56 billion were pledged as of March 31, 2021 and December 31, 2020, respectively, to collateralize FHLB borrowings, borrowings from the FRDW, repurchase agreements and public fund deposits, for potential liquidity needs or other purposes as required by law.

The following tables represent the fair value and unrealized losses on AFS investment and MBS for which an allowance for credit losses has not been recorded as of March 31, 2021 and December 31, 2020, segregated by major security type and length of time in a continuous loss position (in thousands):

	March 31, 2021
	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:
U.S. Treasury	$	23,599	$	349	$	—	$	—	$	23,599	$	349
State and political subdivisions	205,469		8,684		—		—		205,469		8,684
Other stocks and bonds	28,845		216		—		—		28,845		216
MBS:
Residential	7,769		301		—		—		7,769		301
Commercial	4,488		402		—		—		4,488		402
Total	$	270,170	$	9,952	$	—	$	—	$	270,170	$	9,952
	December 31, 2020
	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	$	17,305	$	37	$	—	$	—	$	17,305	$	37
Other stocks and bonds	11,562		22		—		—		11,562		22
MBS:
Residential	6,287		73		—		—		6,287		73
Commercial	4,744		150		—		—		4,744		150
Total	$	39,898	$	282	$	—	$	—	$	39,898	$	282

With the adoption of ASU 2016-13, for those AFS debt securities in an unrealized loss position where management (i) has the intent to sell or (ii) where it will more-likely-than-not be required to sell the security before the recovery of its amortized cost basis, we write the security down to fair value with an adjustment to earnings. For those AFS debt securities in an unrealized loss position that do not meet either of these criteria, management assesses whether the decline in fair value has resulted from credit-related factors, using both qualitative and quantitative criteria. Determining the allowance under the credit loss method requires the use of a discounted cash flow method to assess the credit losses. Any credit-related impairment will be recognized in allowance for credit losses on the balance sheet with a corresponding adjustment to earnings. Noncredit-related impairment, the portion of the impairment relating to factors other than credit (such as changes in market interest rates), is recognized in other comprehensive income, net of tax.

Based on our consideration of the qualitative factors associated with each security type in our AFS portfolio, we did not recognize any unrealized losses in income on our AFS securities during the three months ended March 31, 2021 or 2020. Our state and political subdivisions are highly rated municipal securities with a long history of no credit losses. Our AFS MBS are highly rated securities which are either explicitly or implicitly backed by the U.S. Government through its agencies which are highly rated by major ratings agencies and also have a long history of no credit losses. Our other stocks and bonds as of March 31, 2021 consist of highly rated investment grade bonds. Management does not intend to sell and it is likely we will not be required to sell those securities in an unrealized loss position prior to the anticipated recovery of the amortized cost basis. These unrealized losses on our investment and MBS are largely due to changes in interest rates and spreads and other market conditions impacted by COVID-19. As of March 31, 2021 and December 31, 2020, we did not have an allowance for credit losses on our AFS securities.

We assess the likelihood of default and the potential amount of default when assessing our HTM securities for credit losses. We utilize term structures and, due to no prior loss exposure on our state and political subdivision securities, we currently apply a third-party average loss given default rate to model our securities. Due to a small number of HTM municipal securities in our portfolio as of March 31, 2021 and 2020, we elected to use the specific identification method to model these securities which aligns with our third-party fair value measurement process. The model determined any expected credit loss over the life of these

securities to be remote. Management further evaluated the remote expectation of loss along with the qualitative factors associated with these securities and concluded that, due to the securities being highly rated municipals with a long history of no credit losses, no credit loss should be recognized for these securities for the three months ended March 31, 2021 or 2020.

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 $2.4 million ($1.9 million, net of tax) at March 31, 2021 and $2.9 million ($2.3 million, net of tax) at December 31, 2020. 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 impairment for each individual security. There were no securities transferred from AFS to HTM during the three months ended March 31, 2021 or the year ended December 31, 2020.

The accrued interest receivable on our debt securities is excluded from the credit loss estimate and is included in interest receivable on our consolidated balance sheets. As of March 31, 2021, accrued interest receivable on AFS and HTM debt securities totaled $13.4 million and $259,000, respectively. As of December 31, 2020, accrued interest receivable on AFS and HTM debt securities totaled $22.0 million and $298,000, respectively. No HTM debt securities were past-due or on nonaccrual status as of March 31, 2021 or December 31, 2020.

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

	Three Months Ended March 31,
	2021		2020
U.S. Treasury	$	37	$	—
State and political subdivisions	10,406		6,625
Other stocks and bonds	845		93
MBS	6,088		11,534
Total interest income on securities	$	17,376	$	18,252

There was a $2.0 million net realized gain from the AFS securities portfolio for the three months ended March 31, 2021, which consisted of $2.1 million in realized gains and $52,000 in realized losses.  There was a $5.5 million net realized gain from the AFS securities portfolio for the three months ended March 31, 2020, which consisted of $5.6 million in realized gains and $10,000 in realized losses. There were no sales from the HTM portfolio during the three months ended March 31, 2021 or 2020.  We calculate realized gains and losses on sales of securities under the specific identification method.

Expected maturities on our securities may differ from contractual maturities because issuers may have the right to call or prepay obligations.  MBS are presented in total by category since MBS are typically issued with stated principal amounts and 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.

The amortized cost and estimated fair value of AFS and HTM securities at March 31, 2021, are presented below by contractual maturity (in thousands):

	March 31, 2021
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment securities:
Due in one year or less	$	1,036	$	1,061
Due after one year through five years	32,542		33,937
Due after five years through ten years	93,914		96,177
Due after ten years	1,535,281		1,595,730
	1,662,773		1,726,905
MBS:	785,340		820,019
Total	$	2,448,113	$	2,546,924

	March 31, 2021
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment securities:
Due in one year or less	$	120	$	121
Due after one year through five years	509		514
Due after five years through ten years	279		282
Due after ten years	—		—
	908		917
MBS:	97,251		103,260
Total	$	98,159	$	104,177

Equity Investments

Equity investments on our consolidated balance sheets include Community Reinvestment Act funds with a readily determinable fair value as well as equity investments without readily determinable fair values. At March 31, 2021 and December 31, 2020, we had equity investments recorded in our consolidated balance sheets of $11.8 million and $11.9 million, respectively.

Any realized and unrealized gains and losses on equity investments are reported in income. Equity investments without readily determinable fair values are recorded at cost less impairment, if any.

The following is a summary of unrealized and realized gains and losses on equity investments recognized in other noninterest income in the consolidated statements of income during the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Net (losses) gains recognized during the period on equity investments	$	(107)	$	53
Less: Net gains recognized during the period on equity investments sold during the period	—		—
Unrealized (losses) gains recognized during the reporting period on equity investments held at the reporting date	$	(107)	$	53

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 March 31, 2021.

FHLB Stock

Our FHLB stock, which has limited marketability, is carried at cost and is assessed quarterly for other-than-temporary impairment. Based upon evaluation by management at March 31, 2021, our FHLB stock was not impaired and thus was not considered to be other-than-temporarily impaired.

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Loans and Allowance for Loan Losses

3 Months Ended

Mar. 31, 2021

Receivables [Abstract]

Loans and Allowance for Loan Losses

Loans and Allowance for Loan Losses

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

	March 31, 2021		December 31, 2020
Real estate loans:
Construction	$	605,677	$	581,941
1-4 family residential	700,430		719,952
Commercial	1,348,551		1,295,746
Commercial loans	564,745		557,122
Municipal loans	406,377		409,028
Loans to individuals	90,818		93,990
Total loans	3,716,598		3,657,779
Less: Allowance for loan losses	41,454		49,006
Net loans	$	3,675,144	$	3,608,773

Paycheck Protection Program Loans

In April 2020, we began originating loans to qualified small businesses under the PPP administered by the SBA under the provisions of the CARES Act. Loans covered by the PPP may be eligible for loan forgiveness for certain costs incurred related to payroll, group health care benefit costs and qualifying mortgage, rent and utility payments. The remaining loan balance after forgiveness of any amount is still fully guaranteed by the SBA. On December 27, 2020, the Economic Aid Act was signed into law. This second coronavirus relief package granted additional funds for a new round of PPP loans. Additionally, it expanded the eligibility for loans and allowed certain businesses to request a second loan. In return for processing and booking a PPP loan, the SBA paid lenders a processing fee tiered by the size of the loan. These loans are included in commercial loans with an amortized cost basis at March 31, 2021 and December 31, 2020 of $220.9 million and $214.8 million, respectively.

Construction Real Estate 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 completed 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.

1-4 Family Residential Real Estate 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 March 31, 2021 consisted of $1.25 billion of owner and non-owner occupied real estate, $81.6 million of loans secured by multi-family properties and $15.0 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. 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.  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 make loans to municipalities and school districts primarily throughout the state of Texas, with a small percentage originating outside of the state.  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. Lending money directly to these municipalities allows us to earn a higher yield than we could if we purchased municipal securities for similar durations.

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.

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.

The following tables set forth the amortized cost basis by class of financing receivable and credit quality indicator for the periods presented (in thousands):

March 31, 2021	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2021		2020		2019		2018		2017		Prior
Construction real estate:
Pass	$	26,255	$	160,527	$	182,708	$	75,258	$	33,261	$	8,877	$	118,479	$	605,365
Pass watch	—		—		—		—		—		22		—		22
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		54		—		54
Doubtful	—		—		—		59		—		177		—		236
Total construction real estate	$	26,255	$	160,527	$	182,708	$	75,317	$	33,261	$	9,130	$	118,479	$	605,677
1-4 family residential real estate:
Pass	$	39,457	$	151,235	$	104,065	$	63,864	$	46,692	$	283,115	$	2,506	$	690,934
Pass watch	—		—		—		—		—		823		—		823
Special mention	—		—		—		—		—		65		—		65
Substandard	10		1,684		—		—		943		5,289		94		8,020
Doubtful	—		14		—		135		34		405		—		588
Total 1-4 family residential real estate	$	39,467	$	152,933	$	104,065	$	63,999	$	47,669	$	289,697	$	2,600	$	700,430
Commercial real estate:
Pass	$	138,805	$	236,874	$	285,638	$	110,462	$	181,077	$	247,524	$	6,857	$	1,207,237
Pass watch	—		—		—		23,272		37,938		5,472		—		66,682
Special mention	24,142		577		8,883		7,002		138		12,245		—		52,987
Substandard	2,105		4,631		—		1,956		63		12,756		—		21,511
Doubtful	—		—		—		—		—		134		—		134
Total commercial real estate	$	165,052	$	242,082	$	294,521	$	142,692	$	219,216	$	278,131	$	6,857	$	1,348,551
Commercial loans:
Pass	$	108,205	$	221,819	$	41,605	$	17,819	$	6,368	$	8,280	$	146,516	$	550,612
Pass watch	43		2,313		1,199		2,004		1,487		—		378		7,424
Special mention	280		—		718		416		36		385		320		2,155
Substandard	185		454		989		481		2		—		1,486		3,597
Doubtful	—		382		95		449		31		—		—		957
Total commercial loans	$	108,713	$	224,968	$	44,606	$	21,169	$	7,924	$	8,665	$	148,700	$	564,745
Municipal loans:
Pass	$	14,748	$	69,822	$	66,741	$	32,166	$	59,756	$	163,144	$	—	$	406,377
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	14,748	$	69,822	$	66,741	$	32,166	$	59,756	$	163,144	$	—	$	406,377
Loans to individuals:
Pass	$	12,798	$	39,592	$	20,715	$	8,079	$	3,672	$	2,079	$	3,521	$	90,456
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		47		—		—		4		51
Substandard	—		19		34		22		27		10		—		112
Doubtful	—		67		—		5		44		83		—		199
Total loans to individuals	$	12,798	$	39,678	$	20,749	$	8,153	$	3,743	$	2,172	$	3,525	$	90,818
Total loans	$	367,033	$	890,010	$	713,390	$	343,496	$	371,569	$	750,939	$	280,161	$	3,716,598

December 31, 2020	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2020		2019		2018		2017		2016		Prior
Construction real estate:
Pass	$	155,693	$	180,536	$	76,090	$	55,636	$	3,191	$	8,297	$	101,793	$	581,236
Pass watch	—		—		—		—		23		—		—		23
Special mention	—		—		—		—		—		—		—		—
Substandard	—		382		62		—		—		58		—		502
Doubtful	—		—		—		—		—		180		—		180
Total construction real estate	$	155,693	$	180,918	$	76,152	$	55,636	$	3,214	$	8,535	$	101,793	$	581,941
1-4 family residential real estate:
Pass	$	154,003	$	114,063	$	70,621	$	55,557	$	57,680	$	255,003	$	2,833	$	709,760
Pass watch	—		—		—		—		267		564		—		831
Special mention	—		—		—		—		—		10		—		10
Substandard	1,473		—		135		427		1,588		5,134		96		8,853
Doubtful	—		—		—		36		103		359		—		498
Total 1-4 family residential real estate	$	155,476	$	114,063	$	70,756	$	56,020	$	59,638	$	261,070	$	2,929	$	719,952
Commercial real estate:
Pass	$	270,087	$	307,161	$	143,177	$	162,180	$	98,828	$	179,919	$	6,957	$	1,168,309
Pass watch	—		—		3,153		40,125		1,696		2,582		—		47,556
Special mention	4,555		33,020		7,041		140		4,531		7,850		—		57,137
Substandard	7,542		—		2,097		65		704		12,282		—		22,690
Doubtful	—		—		—		—		—		54		—		54
Total commercial real estate	$	282,184	$	340,181	$	155,468	$	202,510	$	105,759	$	202,687	$	6,957	$	1,295,746
Commercial loans:
Pass	$	313,688	$	47,446	$	20,386	$	7,505	$	3,392	$	6,142	$	140,018	$	538,577
Pass watch	2,599		1,318		2,410		1,981		—		—		370		8,678
Special mention	304		809		433		39		286		265		455		2,591
Substandard	405		1,081		473		7		—		—		4,417		6,383
Doubtful	310		53		475		54		1		—		—		893
Total commercial loans	$	317,306	$	50,707	$	24,177	$	9,586	$	3,679	$	6,407	$	145,260	$	557,122
Municipal loans:
Pass	$	72,542	$	68,132	$	33,735	$	61,170	$	25,387	$	148,062	$	—	$	409,028
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	72,542	$	68,132	$	33,735	$	61,170	$	25,387	$	148,062	$	—	$	409,028
Loans to individuals:
Pass	$	46,722	$	25,302	$	10,132	$	4,716	$	1,867	$	917	$	3,900	$	93,556
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		51		—		—		—		4		55
Substandard	6		35		28		30		9		11		1		120
Doubtful	73		20		6		55		81		24		—		259
Total loans to individuals	$	46,801	$	25,357	$	10,217	$	4,801	$	1,957	$	952	$	3,905	$	93,990
Total loans	$	1,030,002	$	779,358	$	370,505	$	389,723	$	199,634	$	627,713	$	260,844	$	3,657,779

The following tables present the aging of the amortized cost basis in past due loans by class of loans (in thousands):

	March 31, 2021
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current		Total
Real estate loans:
Construction	$	1,130	$	—	$	—	$	1,130	$	604,547	$	605,677
1-4 family residential	5,321		614		486		6,421		694,009		700,430
Commercial	4,676		—		—		4,676		1,343,875		1,348,551
Commercial loans	1,507		245		641		2,393		562,352		564,745
Municipal loans	—		—		—		—		406,377		406,377
Loans to individuals	418		30		3		451		90,367		90,818
Total	$	13,052	$	889	$	1,130	$	15,071	$	3,701,527	$	3,716,598

	December 31, 2020
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current		Total
Real estate loans:
Construction	$	95	$	14	$	444	$	553	$	581,388	$	581,941
1-4 family residential	7,872		2,469		2,830		13,171		706,781		719,952
Commercial	467		315		86		868		1,294,878		1,295,746
Commercial loans	1,423		4,516		323		6,262		550,860		557,122
Municipal loans	64		—		—		64		408,964		409,028
Loans to individuals	519		123		27		669		93,321		93,990
Total	$	10,440	$	7,437	$	3,710	$	21,587	$	3,636,192	$	3,657,779

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

	March 31, 2021		December 31, 2020
Nonaccrual loans:
Real estate loans:
Construction	$	248	$	640
1-4 family residential	1,929		3,922
Commercial	1,229		1,269
Commercial loans	1,682		1,592
Loans to individuals	226		291
Total nonaccrual loans (1)	5,314		7,714
Accruing loans past due more than 90 days	—		—
TDR loans	9,641		9,646
OREO	412		106
Repossessed assets	—		14
Total nonperforming assets	$	15,367	$	17,480

(1)    Includes $889,000 and $976,000 of restructured loans as of March 31, 2021 and December 31, 2020, respectively.

We reversed $18,000 and $121,000 of interest income on nonaccrual loans during the three months ended March 31, 2021 and 2020, respectively. We had $1.6 million and $2.2 million of loans on nonaccrual for which there was no related allowance for credit losses as of March 31, 2021 and December 31, 2020, respectively.

Collateral-dependent loans are loans that we expect the repayment to be provided substantially through the operation or sale of the collateral of the loan and we have determined that the borrower is experiencing financial difficulty. In such cases, expected credit losses are based on the fair value of the collateral at the measurement date, adjusted for selling costs. As of March 31, 2021 and December 31, 2020, we had $11.2 million and $11.5 million, respectively, of collateral-dependent loans, secured mainly by real estate and equipment. There have been no significant changes to the collateral that secures the collateral-dependent assets. Foreclosed assets include OREO 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 $234,000 and $1.2 million in loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of March 31, 2021 and December 31, 2020, respectively.

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.

In response to the impact of the COVID-19 pandemic on the economy, the CARES Act was signed into law. Under the CARES Act, banks may elect to deem that loan modifications do not result in TDRs if they are: (1) related to COVID-19; (2) executed on a loan that was not more than 30 days past due as of December 31, 2019; and (3) executed between March 1, 2020, and the earlier of (A) 60 days after the date of termination of the national emergency declaration or (B) December 31, 2020. The Economic Aid Act extended this relief to the earlier of 60 days after the national emergency termination date or January 1, 2022. Additionally, in accordance with the Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus (Revised), other short-term modifications made on a good faith basis in response to COVID-19 to borrowers who were current prior to any relief are not TDRs under ASC Subtopic 310-40. This includes short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant. Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented. Loans modified under this guidance are not considered TDRs and as such are not identified in the table below. At March 31, 2021 and December 31, 2020, we had outstanding loans with payment deferrals, generally for up to three months, totaling $1.7 million and $47.2 million, respectively.

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

	Three Months Ended March 31, 2021
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real estate loans:
1-4 family residential	$	—	$	—	$	130	$	130	2
Commercial loans	—		—		18		18		1
Total	$	—	$	—	$	148	$	148	3

	Three Months Ended March 31, 2020
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real estate loans:
Commercial	$	—	$	—	$	59	$	59	1
Commercial loans	—		—		3		3		1
Total	$	—	$	—	$	62	$	62	2

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 three months ended March 31, 2021 and 2020 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 loans 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 months ended March 31, 2021, and 2020 the amount of TDRs in default was not significant. Payment defaults for TDRs did not significantly impact the determination of the allowance for loan losses in the periods presented.

At March 31, 2021 and 2020, there were no commitments to lend additional funds to borrowers whose terms had been modified in TDRs.

Allowance for Loan Losses

In accordance with ASC 326, the allowance for credit losses on loans is estimated and recognized upon origination of the loan based on expected credit losses. The CECL model uses historical experience and current conditions for homogeneous pools of loans, and reasonable and supportable forecasts about future events. The impact of varying economic conditions and portfolio stress factors are a component of the credit loss models applied to each portfolio. Reserve factors are specific to the loan segments that share similar risk characteristics based on the probability of default assumptions and loss given default assumptions, over the contractual term. The forecasted periods gradually mean-revert to the long-run trend based upon historical data. Management evaluates the economic data points used in the Moody’s forecasting scenarios on a quarterly basis to determine the most appropriate impact to the various portfolio characteristics based on management’s view and applies weighting to various forecasting scenarios as deemed appropriate based on known and expected economic activities. Management also considers and may apply relevant qualitative factors, not previously considered, to determine the appropriate allowance level. The use of the CECL model includes significant judgment by management and may differ from those of our peers due to different historical loss patterns, economic forecasts, and the length of time of the reasonable and supportable forecast period and reversion period.

We utilize Moody’s Analytics economic forecast scenarios and assign probability weighting to those scenarios which best reflect management’s views on the economic forecast. The probability weighting and scenarios utilized for the estimate of the allowance were generally reflective of an improved economic forecast based on known and knowable information as of March 31, 2021.

When determining the appropriate allowance for credit losses on our loan portfolio, our commercial construction and real estate loans, commercial loans and municipal loans utilize the probability of default/loss given default discounted cash flow approach. Reserves on these loans are based upon risk factors including the loan type and structure, collateral type, leverage ratio, refinancing risk and origination quality, among others. Our consumer construction real estate loans, 1-4 family residential loans and our loans to individuals use a loss rate based upon risk factors including loan types, origination year and credit scores. PPP loans are fully guaranteed by the SBA and therefore do not have an associated allowance.

Loans evaluated collectively in a pool are monitored to ensure they continue to exhibit similar risk characteristics with other loans in the pool. If a loan does not share similar risk characteristics with other loans, expected credit losses for that loan are evaluated individually.

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

	Three Months Ended March 31, 2021
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	6,490	$	2,270	$	35,709	$	4,107	$	46	$	384	$	49,006
Loans charged-off	—		(73)		—		(319)		—		(403)		(795)
Recoveries of loans charged-off	1		55		—		282		—		284		622
Net loans (charged-off) recovered	1		(18)		—		(37)		—		(119)		(173)
Provision for (reversal of) loan losses	1,710		256		(8,473)		(962)		—		90		(7,379)
Balance at end of period	$	8,201	$	2,508	$	27,236	$	3,108	$	46	$	355	$	41,454

	Three Months Ended March 31, 2020
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,539	$	3,833	$	9,572	$	6,351	$	570	$	932	$	24,797
Impact of CECL adoption - cumulative effect adjustment	2,968		(1,447)		7,730		(3,532)		(522)		(125)		5,072
Impact of CECL adoption - purchased loans with credit deterioration	(15)		(6)		333		(22)		—		(59)		231
Loans charged-off	(33)		(54)		(21)		(296)		—		(591)		(995)
Recoveries of loans charged-off	11		4		69		74		—		293		451
Net loans (charged-off) recovered	(22)		(50)		48		(222)		—		(298)		(544)
Provision for (reversal of) loan losses(1)	3,184		310		18,437		1,944		(1)		208		24,082
Balance at end of period	$	9,654	$	2,640	$	36,120	$	4,519	$	47	$	658	$	53,638

(1)    The increase in the provision for credit losses during 2020 was primarily due to the economic impact of COVID-19 on macroeconomic factors used in the CECL model.

The accrued interest receivable on our loan receivables is excluded from the allowance for credit loss estimate and is included in interest receivable on our consolidated balance sheets. As of March 31, 2021 and December 31, 2020, the accrued interest on our loan portfolio was $13.8 million and $16.4 million, respectively.

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Borrowing Arrangements

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Borrowing Arrangements

Borrowing Arrangements

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

	March 31, 2021			December 31, 2020
Other borrowings:
Balance at end of period	$	22,315		$	23,172
Average amount outstanding during the period (1)	23,522			91,940
Maximum amount outstanding during the period (2)	24,549			219,259
Weighted average interest rate during the period (3)	0.2		%	0.4		%
Interest rate at end of period (4)	0.2		%	0.1		%
FHLB borrowings:
Balance at end of period	$	665,530		$	832,527
Average amount outstanding during the period (1)	727,513			1,032,269
Maximum amount outstanding during the period (2)	723,584			1,274,370
Weighted average interest rate during the period (3)	1.1		%	1.1		%
Interest rate at end of period (4)	1.1		%	1.0		%

(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.

Maturities of the obligations associated with our borrowing arrangements based on scheduled repayments at March 31, 2021 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
Other borrowings	$	22,315	$	—	$	—	$	—	$	—	$	—	$	22,315
FHLB borrowings	661,659		687		717		748		775		944		665,530
Total obligations	$	683,974	$	687	$	717	$	748	$	775	$	944	$	687,845

Other borrowings include federal funds purchased, repurchase agreements and borrowings from the FRDW. 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 March 31, 2021 or December 31, 2020.  To provide more liquidity in response to the economic impact of the COVID-19 pandemic, the Federal Reserve took steps to encourage broader use of the discount window. At March 31, 2021, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities and PPP loans, was approximately $618.1 million. There were no borrowings from the FRDW at March 31, 2021 or December 31, 2020. Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit, and at March 31, 2021, the line had one outstanding letter of credit for $91,000. 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 repurchase agreements. These repurchase agreements totaled $22.3 million at March 31, 2021 and $23.2 million at December 31, 2020, and had maturities of less than one year.  Repurchase agreements are secured by investment and MBS securities and are stated at the amount of cash received in connection with the transaction.

FHLB borrowings represent borrowings with fixed interest rates ranging from 0.08% to 4.799% and with remaining maturities of five days to 7.3 years at March 31, 2021.  FHLB borrowings may be collateralized by FHLB stock, nonspecified loans and/or securities. At March 31, 2021, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by

securities, FHLB stock and nonspecified loans and securities, was approximately $1.25 billion, net of FHLB stock purchases required.  

Southside Bank has entered into various variable rate agreements and fixed rate short-term pay agreements with third-party financial institutions with rates tied to LIBOR. These agreements totaled $625.0 million at March 31, 2021 and $670.0 million at December 31, 2020. Six of the agreements have an interest rate tied to three-month LIBOR, and the remaining agreements have interest rates tied to one-month LIBOR. In connection with all of these agreements, Southside Bank also entered into various interest rate swap contracts that are treated as cash flow hedges under ASC Topic 815, “Derivatives and Hedging” that are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the underlying LIBOR interest rate. The interest rate swap contracts had a weighted average rate of 1.11% with a weighted average maturity of 3.8 years at March 31, 2021. Refer to “Note 9 – 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.

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Long-term Debt

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Long-term Debt

Long-term Debt

Information related to our long-term debt is summarized as follows for the periods presented (in thousands):    

	March 31, 2021		December 31, 2020
Subordinated notes: (1)
3.875% Subordinated notes, net of unamortized debt issuance costs (2)	$	98,469	$	98,497
5.50% Subordinated notes, net of unamortized debt issuance costs (3)	98,799		98,754
Total Subordinated notes	197,268		197,251
Trust preferred subordinated debentures: (4)
Southside Statutory Trust III, net of unamortized debt issuance costs (5)	20,564		20,563
Southside Statutory Trust IV	23,196		23,196
Southside Statutory Trust V	12,887		12,887
Magnolia Trust Company I	3,609		3,609
Total Trust preferred subordinated debentures	60,256		60,255
Total Long-term debt	$	257,524	$	257,506

(1)This debt consists of subordinated notes with a remaining maturity greater than one year that qualify under the risk-based capital guidelines as Tier 2 capital, subject to certain limitations.

(2)The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.5 million at March 31, 2021 and December 31, 2020.

(3)The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.2 million at March 31, 2021 and December 31, 2020.

(4)This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.

(5)The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $55,000 at March 31, 2021 and $56,000 at December 31, 2020.

As of March 31, 2021, the details of the subordinated notes and the trust preferred subordinated debentures are summarized below (dollars in thousands):

	Date Issued	Amount Issued		Fixed or Floating Rate	Interest Rate	Maturity Date
3.875% Subordinated Notes	November 6, 2020	$	100,000	Fixed-to-Floating	3.875%	November 15, 2030
5.50% Subordinated Notes	September 19, 2016	$	100,000	Fixed-to-Floating	5.50%	September 30, 2026
Southside Statutory Trust III	September 4, 2003	$	20,619	Floating	3 month LIBOR + 2.94%	September 4, 2033
Southside Statutory Trust IV	August 8, 2007	$	23,196	Floating	3 month LIBOR + 1.30%	October 30, 2037
Southside Statutory Trust V	August 10, 2007	$	12,887	Floating	3 month LIBOR + 2.25%	September 15, 2037
Magnolia Trust Company I (1)	October 10, 2007	$	3,609	Floating	3 month LIBOR + 1.80%	November 23, 2035

(1)On October 10, 2007, as part of an acquisition we assumed $3.6 million of floating rate junior subordinated debentures issued in 2005 to Magnolia Trust Company I.

On September 19, 2016, the Company issued $100.0 million in aggregate principal amount of fixed-to-floating rate subordinated notes that mature on September 30, 2026. This debt initially bears interest at a fixed rate of 5.50% through September 29, 2021 and thereafter, adjusts quarterly at a floating rate equal to three-month LIBOR plus 429.7 basis points. The proceeds from the sale of the subordinated notes were used for general corporate purposes, which included advances to the Bank to finance its activities. On November 6, 2020, the Company issued $100.0 million in aggregate principal amount of fixed-to-floating rate subordinated notes that mature on November 15, 2030. This debt initially bears interest at a fixed rate of 3.875% per year through November 14, 2025 and thereafter, adjusts quarterly at a floating rate equal to the then current three-month term SOFR, as published by the FRBNY, plus 366 basis points. The proceeds from the sale of the subordinated notes were used for general corporate purposes.

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Employee Benefit Plans

3 Months Ended

Mar. 31, 2021

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [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 March 31,
	Defined Benefit Pension Plan				Defined Benefit Pension Plan Acquired				Restoration Plan
	2021		2020		2021		2020		2021		2020
Service cost	$	—	$	423	$	—	$	—	$	—	$	85
Interest cost	628		837		24		41		121		160
Expected return on assets	(1,437)		(1,668)		(58)		(84)		—		—
Net loss amortization	520		533		3		2		118		193
Prior service (credit) cost amortization	—		(3)		—		—		—		2
Net periodic benefit (income) cost	$	(289)	$	122	$	(31)	$	(41)	$	239	$	440

Prior to the freeze of all future benefit accruals and accrual of benefit service as of December 31, 2020, the service cost component was recorded on our consolidated income statements as salaries and employee benefits in noninterest expense. All other components other than service costs are recorded in other noninterest expense.

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Derivative Financial Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2021

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, fair value hedges of a recognized asset or liability or as non-hedging instruments. Gains and losses on derivative instruments designated as cash flow hedges are recorded in AOCI to the extent they are effective. If the hedge is 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. For derivative instruments not designated as hedging instruments, the gain or loss is recognized in current earnings during the period of change.

We have entered into certain interest rate swap contracts on specific variable rate agreements and fixed rate short-term pay agreements with third-party financial institutions. 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 $625.0 million of debt. The cash flows from the swap contracts are expected to be effective in hedging the variability in future cash flows attributable to fluctuations in the underlying LIBOR interest rate.

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 the forecasted transaction will not occur by the end of the originally specified time period. 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.

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. 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 March 31, 2021 and December 31, 2020, net derivative liabilities included $19.1 million and $39.3 million, respectively, of cash collateral held by counterparties subject to master netting agreements. We had $1.3 million of cash collateral receivable that was not offset against derivative liabilities at March 31, 2021.

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):

	March 31, 2021						December 31, 2020
			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	$	625,000	$	2,145	$	11,189	$	670,000	$	—	$	21,635
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	217,655		910		10,980		152,280		—		18,537
Swaps-Customer counterparties	217,655		10,980		910		152,280		18,537		—
Gross derivatives			14,035		23,079				18,537		40,172
Offsetting derivative assets/liabilities			(3,055)		(3,055)				—		—
Cash collateral received/posted			—		(19,114)				—		(39,270)
Net derivatives included in the consolidated balance sheets (2)			$	10,980	$	910			$	18,537	$	902

(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 $1.3 million credit exposure related to interest rate swaps with financial institutions and $11.0 million related to interest rate swaps with customers at March 31, 2021. We had no credit exposure related to interest rate swaps with financial institutions and $18.5 million related to interest rate swaps with customers at December 31, 2020. 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 fixed pay swaps are based on one-month or three-month LIBOR rates in effect at March 31, 2021 and December 31, 2020:

	March 31, 2021							December 31, 2020
			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	$	625,000	3.8	0.14	%	1.11	%	$	670,000	3.8	0.17	%	1.12	%
Swaps-Non-hedging
Financial institution counterparties	217,655		11.0	0.52	%	2.43	%	152,280		9.8	0.50	%	2.57	%
Customer counterparties	217,655		11.0	2.43	%	0.52	%	152,280		9.8	2.57	%	0.50	%

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Fair Value Measurement

3 Months Ended

Mar. 31, 2021

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 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 market participants would use in pricing the asset or liability.  Valuation policies and procedures are determined by our investment department and reported to our 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.

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. 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.

Securities AFS and Equity Investments with readily determinable fair values – U.S. Treasury securities and equity investments with readily determinable fair values are reported at fair value utilizing Level 1 inputs.  Other securities classified as AFS 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 some 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 two 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 collateral-dependent loans at March 31, 2021 and December 31, 2020.

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 credit losses.

Collateral-Dependent Loans (Impaired loans prior to the adoption of ASU 2016-13) – Certain loans may be reported at the fair value of the underlying collateral if repayment is expected substantially from the operation or sale of the collateral.  Collateral values are estimated using Level 3 inputs based on customized discounting criteria or appraisals.  At March 31, 2021 and December 31, 2020, the impact of the fair value of collateral-dependent loans was reflected in our allowance for loan losses.

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 fair value tables do not necessarily represent their underlying 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):

			Fair Value Measurements at the End of the Reporting Period Using
March 31, 2021	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	$	42,477	$	42,477	$	—	$	—
State and political subdivisions	1,591,645		—		1,591,645		—
Other stocks and bonds	92,783		—		92,783		—
MBS: (1)
Residential	707,074		—		707,074		—
Commercial	112,945		—		112,945		—
Equity investments:
Equity investments	5,988		5,988		—		—
Derivative assets:
Interest rate swaps	14,035		—		14,035		—
Total asset recurring fair value measurements	$	2,566,947	$	48,465	$	2,518,482	$	—
Derivative liabilities:
Interest rate swaps	$	23,079	$	—	$	23,079	$	—
Total liability recurring fair value measurements	$	23,079	$	—	$	23,079	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	412	$	—	$	—	$	412
Collateral-dependent loans (2)	10,223		—		—		10,223
Total asset nonrecurring fair value measurements	$	10,635	$	—	$	—	$	10,635

			Fair Value Measurements at the End of the Reporting Period Using
December 31, 2020	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:
State and political subdivisions	$	1,580,594	$	—	$	1,580,594	$	—
Other stocks and bonds	78,255		—		78,255		—
MBS: (1)
Residential	810,010		—		810,010		—
Commercial	118,446		—		118,446		—
Equity investments:
Equity investments	6,094		6,094		—		—
Derivative assets:
Interest rate swaps	18,537		—		18,537		—
Total asset recurring fair value measurements	$	2,611,936	$	6,094	$	2,605,842	$	—
Derivative liabilities:
Interest rate swaps	$	40,172	$	—	$	40,172	$	—
Total liability recurring fair value measurements	$	40,172	$	—	$	40,172	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	120	$	—	$	—	$	120
Collateral-dependent loans (2)	10,653		—		—		10,653
Total asset nonrecurring fair value measurements	$	10,773	$	—	$	—	$	10,773

(1)All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

(2)Consists of individually evaluated loans. Loans for which the fair value of the collateral and commercial real estate fair value of the properties is less than cost basis are presented net of 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 MBS HTM – 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 – The carrying value of 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 – We estimate the fair value of our loan portfolio to an exit price notion with adjustments for liquidity, credit and prepayment factors. 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.

Other borrowings – 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.

Trust preferred subordinated debentures – 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
March 31, 2021	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	107,623	$	107,623	$	107,623	$	—	$	—
Investment securities:
HTM, at carrying value	908		917		—		917		—
MBS:
HTM, at carrying value	97,251		103,260		—		103,260		—
FHLB stock, at cost	18,754		18,754		—		18,754		—
Equity investments	5,816		5,816		—		5,816		—
Loans, net of allowance for loan losses	3,675,144		3,833,854		—		—		3,833,854
Loans held for sale	2,615		2,615		—		2,615		—
Financial liabilities:
Deposits	$	5,092,643	$	5,095,397	$	—	$	5,095,397	$	—
Other borrowings	22,315		22,315		—		22,315		—
FHLB borrowings	665,530		675,135		—		675,135		—
Subordinated notes, net of unamortized debt issuance costs	197,268		198,103		—		198,103		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,256		47,183		—		47,183		—

			Estimated Fair Value
December 31, 2020	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	108,408	$	108,408	$	108,408	$	—	$	—
Investment securities:
HTM, at carrying value	907		920		—		920		—
Mortgage-backed securities:
HTM, at carrying value	108,091		117,278		—		117,278		—
Federal Home Loan Bank stock, at cost	25,259		25,259		—		25,259		—
Equity investments	5,811		5,811		—		5,811		—
Loans, net of allowance for loan losses	3,608,773		3,784,291		—		—		3,784,291
Loans held for sale	3,695		3,695		—		3,695		—
Financial liabilities:
Deposits	$	4,932,322	$	4,936,188	$	—	$	4,936,188	$	—
Other borrowings	23,172		23,172		—		23,172		—
FHLB borrowings	832,527		854,865		—		854,865		—
Subordinated notes, net of unamortized debt issuance costs	197,251		198,391		—		198,391		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,255		51,993		—		51,993		—

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Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

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

	Three Months Ended March 31,
	2021		2020
Current income tax expense	$	2,589	$	5,554
Deferred income tax expense (benefit)	2,161		(5,075)
Income tax expense	$	4,750	$	479

The net deferred tax liability totaled $9.9 million at March 31, 2021 and $15.5 million at December 31, 2020.  No valuation allowance was recorded at March 31, 2021 or December 31, 2020, as management believes it is more likely than not that all of the deferred tax asset items will be realized in future years. Unrecognized tax benefits were not material at March 31, 2021 or December 31, 2020.

We recognized income tax expense of $4.8 million, for an ETR of 12.2% for the three months ended March 31, 2021, compared to income tax expense of $479,000, for an ETR of 10.8%, for the three months ended March 31, 2020. The higher ETR for the three months ended March 31, 2021 was primarily due to a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same periods in 2020. The ETR differs from the statutory rate of 21% for the three months ended March 31, 2021 and 2020 primarily due to the effect of tax-exempt income from municipal loans and securities, as well as BOLI. We file 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 2017 or Texas state tax examinations by tax authorities for years before 2016.

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Off-Balance-Sheet Arrangements, Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

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. The allowance for credit losses on these off-balance-sheet credit exposures is calculated using the same methodology as loans including a conversion or usage factor to anticipate ultimate exposure and expected losses and is included in other liabilities on our consolidated balance sheets.

Allowance for off-balance-sheet credit exposures were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Balance at beginning of period	$	6,386	$	1,455
Impact of CECL adoption	—		4,840
Provision for (reversal of) off-balance-sheet credit exposures	(2,770)		1,165
Balance at end of period	$	3,616	$	7,460

Contractual commitments to extend credit are agreements to lend to a customer provided the terms established in the contract are met.  Commitments to extend credit 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 commitments to extend credit and similarly do not necessarily represent future cash obligations.

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

	March 31, 2021		December 31, 2020
Commitments to extend credit	$	811,574	$	793,138
Standby letters of credit	10,825		13,658
Total	$	822,399	$	806,796

We apply the same credit policies in making commitments to extend credit 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.

Leases. During the three months ended March 31, 2021, there was $1.1 million of operating lease right-of-use assets obtained in exchange for new operating lease liabilities, primarily due to one lease that commenced in January 2021 with an initial right-of-use asset of $1.1 million. There was $227,000 of operating lease right-of-use assets obtained in exchange for new operating lease liabilities for the three months ended March 31, 2020.

Securities. In the normal course of business we buy and sell securities. At March 31, 2021, there were $23.5 million of unsettled trades to purchase securities and no unsettled trades to sell securities. At December 31, 2020, there were no unsettled trades to purchase securities and no unsettled trades to sell securities.

Deposits. There were no unsettled issuances of brokered CDs at March 31, 2021 or December 31, 2020.

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)

3 Months Ended

Mar. 31, 2021

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, including Southside Bank.  The words “Southside” and “Southside Bancshares” refer to Southside Bancshares, Inc.  The words “Southside Bank” and “the Bank” refer to Southside Bank.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. 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, 2020.

Accounting Changes and Reclassifications and Accounting Pronouncements

Accounting Changes and Reclassifications

Certain prior period amounts may be reclassified to conform to current year presentation.

Accounting Pronouncements

In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” ASU 2020-04 is intended to provide relief for companies preparing for discontinuation of interest rates based on LIBOR. The ASU provides optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or other reference rates expected to be discontinued. ASU 2020-04 also provides for a one-time sale and/or transfer to AFS or trading to be made for HTM debt securities that both reference an eligible reference rate and were classified as HTM before January 1, 2020. ASU 2020-04 was effective for all entities as of March 12, 2020 and through December 31, 2022. Companies can apply the ASU as of the beginning of the interim period that includes March 12, 2020 or any date thereafter. The guidance requires companies to apply the guidance prospectively to contract modifications and hedging relationships while the one-time election to sell and/or transfer debt securities classified as HTM may be made any time after March 12, 2020. We have established an officer level committee to guide our transition from LIBOR and have begun efforts to transition to alternative rates consistent with industry timelines. We have identified products that utilize LIBOR and are implementing enhanced fallback language to facilitate the transition to alternative reference rates. We are evaluating existing systems and have begun offering new rates on a limited basis. ASU 2020-04 is not expected to have a material impact on our consolidated financial statements.

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31,
	2021		2020
Basic and Diluted Earnings:
Net income	$	34,091	$	3,953
Basic weighted-average shares outstanding	32,829		33,691
Add:  Stock awards	108		114
Diluted weighted-average shares outstanding	32,937		33,805
Basic earnings per share:
Net income	$	1.04	$	0.12
Diluted earnings per share:
Net income	$	1.04	$	0.12

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021
					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	$	116,078	$	(17,091)	$	149	$	(30,056)	$	69,080
Other comprehensive income (loss):
Other comprehensive (loss) income before reclassifications	(48,979)		11,023		—		—		(37,956)
Reclassification adjustments included in net income	(1,587)		1,568		—		641		622
Income tax benefit (expense)	10,619		(2,644)		—		(135)		7,840
Net current-period other comprehensive (loss) income, net of tax	(39,947)		9,947		—		506		(29,494)
Ending balance, net of tax	$	76,131	$	(7,144)	$	149	$	(29,550)	$	39,586

	Three Months Ended March 31, 2020
					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	$	38,038	$	(1,672)	$	(145)	$	(31,985)	$	4,236
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	61,486		(19,600)		—		—		41,886
Reclassification adjustments included in net income	(5,420)		(101)		(1)		728		(4,794)
Income tax (expense) benefit	(11,774)		4,137		—		(152)		(7,789)
Net current-period other comprehensive income (loss), net of tax	44,292		(15,564)		(1)		576		29,303
Ending balance, net of tax	$	82,330	$	(17,236)	$	(146)	$	(31,409)	$	33,539

Reclassifications out of accumulated other comprehensive income

The reclassification adjustments out of accumulated other comprehensive income (loss) included in net income are presented below (in thousands):

	Three Months Ended March 31,
	2021		2020
Unrealized gains and losses on securities transferred:
Amortization of unrealized gains and losses (1)	$	(416)	$	(121)
Tax benefit	87		25
Net of tax	(329)		(96)
Unrealized gains and losses on available for sale securities:
Realized net gain on sale of securities (2)	2,003		5,541
Tax expense	(420)		(1,164)
Net of tax	1,583		4,377
Derivatives:
Realized net (loss) gain on interest rate swap derivatives (3)	(1,568)		93
Tax benefit (expense)	329		(19)
Net of tax	(1,239)		74
Amortization of unrealized gains on terminated interest rate swap derivatives (3)	—		8
Tax expense	—		(1)
Net of tax	—		7
Amortization of pension plan:
Net actuarial loss (4)	(641)		(728)
Prior service credit (4)	—		1
Total before tax	(641)		(727)
Tax benefit	135		152
Net of tax	(506)		(575)
Total reclassifications for the period, net of tax	$	(491)	$	3,787

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

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

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

(4)    These AOCI 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)

3 Months Ended

Mar. 31, 2021

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 AFS and HTM securities as of March 31, 2021 and December 31, 2020 are reflected in the tables below (in thousands):

	March 31, 2021
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
U.S. Treasury	$	42,818	$	8	$	349	$	42,477
State and political subdivisions	1,528,516		71,813		8,684		1,591,645
Other stocks and bonds	91,439		1,560		216		92,783
MBS: (1)
Residential	675,795		31,580		301		707,074
Commercial	109,545		3,802		402		112,945
Total	$	2,448,113	$	108,763	$	9,952	$	2,546,924
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	908	$	9	$	—	$	917
MBS: (1)
Residential	45,274		3,006		—		48,280
Commercial	51,977		3,003		—		54,980
Total	$	98,159	$	6,018	$	—	$	104,177

	December 31, 2020
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
State and political subdivisions	$	1,475,030	$	105,601	$	37	$	1,580,594
Other stocks and bonds	77,224		1,053		22		78,255
MBS: (1)
Residential	771,409		38,674		73		810,010
Commercial	113,850		4,746		150		118,446
Total	$	2,437,513	$	150,074	$	282	$	2,587,305
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	907	$	13	$	—	$	920
MBS: (1)
Residential	47,948		4,187		—		52,135
Commercial	60,143		5,000		—		65,143
Total	$	108,998	$	9,200	$	—	$	118,198

(1) All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

Unrealized loss on securities

The following tables represent the fair value and unrealized losses on AFS investment and MBS for which an allowance for credit losses has not been recorded as of March 31, 2021 and December 31, 2020, segregated by major security type and length of time in a continuous loss position (in thousands):

	March 31, 2021
	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:
U.S. Treasury	$	23,599	$	349	$	—	$	—	$	23,599	$	349
State and political subdivisions	205,469		8,684		—		—		205,469		8,684
Other stocks and bonds	28,845		216		—		—		28,845		216
MBS:
Residential	7,769		301		—		—		7,769		301
Commercial	4,488		402		—		—		4,488		402
Total	$	270,170	$	9,952	$	—	$	—	$	270,170	$	9,952
	December 31, 2020
	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	$	17,305	$	37	$	—	$	—	$	17,305	$	37
Other stocks and bonds	11,562		22		—		—		11,562		22
MBS:
Residential	6,287		73		—		—		6,287		73
Commercial	4,744		150		—		—		4,744		150
Total	$	39,898	$	282	$	—	$	—	$	39,898	$	282

Interest income recognized on securities

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

	Three Months Ended March 31,
	2021		2020
U.S. Treasury	$	37	$	—
State and political subdivisions	10,406		6,625
Other stocks and bonds	845		93
MBS	6,088		11,534
Total interest income on securities	$	17,376	$	18,252

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 March 31, 2021, are presented below by contractual maturity (in thousands):

	March 31, 2021
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment securities:
Due in one year or less	$	1,036	$	1,061
Due after one year through five years	32,542		33,937
Due after five years through ten years	93,914		96,177
Due after ten years	1,535,281		1,595,730
	1,662,773		1,726,905
MBS:	785,340		820,019
Total	$	2,448,113	$	2,546,924

	March 31, 2021
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment securities:
Due in one year or less	$	120	$	121
Due after one year through five years	509		514
Due after five years through ten years	279		282
Due after ten years	—		—
	908		917
MBS:	97,251		103,260
Total	$	98,159	$	104,177

Unrealized and realized gains (losses) recognized in net income on equity investments

The following is a summary of unrealized and realized gains and losses on equity investments recognized in other noninterest income in the consolidated statements of income during the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Net (losses) gains recognized during the period on equity investments	$	(107)	$	53
Less: Net gains recognized during the period on equity investments sold during the period	—		—
Unrealized (losses) gains recognized during the reporting period on equity investments held at the reporting date	$	(107)	$	53

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Loans and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2021

Receivables [Abstract]

Loans by Portfolio Segment

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

	March 31, 2021		December 31, 2020
Real estate loans:
Construction	$	605,677	$	581,941
1-4 family residential	700,430		719,952
Commercial	1,348,551		1,295,746
Commercial loans	564,745		557,122
Municipal loans	406,377		409,028
Loans to individuals	90,818		93,990
Total loans	3,716,598		3,657,779
Less: Allowance for loan losses	41,454		49,006
Net loans	$	3,675,144	$	3,608,773

Summary of loans by credit quality indicators and origination year

The following tables set forth the amortized cost basis by class of financing receivable and credit quality indicator for the periods presented (in thousands):

March 31, 2021	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2021		2020		2019		2018		2017		Prior
Construction real estate:
Pass	$	26,255	$	160,527	$	182,708	$	75,258	$	33,261	$	8,877	$	118,479	$	605,365
Pass watch	—		—		—		—		—		22		—		22
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		54		—		54
Doubtful	—		—		—		59		—		177		—		236
Total construction real estate	$	26,255	$	160,527	$	182,708	$	75,317	$	33,261	$	9,130	$	118,479	$	605,677
1-4 family residential real estate:
Pass	$	39,457	$	151,235	$	104,065	$	63,864	$	46,692	$	283,115	$	2,506	$	690,934
Pass watch	—		—		—		—		—		823		—		823
Special mention	—		—		—		—		—		65		—		65
Substandard	10		1,684		—		—		943		5,289		94		8,020
Doubtful	—		14		—		135		34		405		—		588
Total 1-4 family residential real estate	$	39,467	$	152,933	$	104,065	$	63,999	$	47,669	$	289,697	$	2,600	$	700,430
Commercial real estate:
Pass	$	138,805	$	236,874	$	285,638	$	110,462	$	181,077	$	247,524	$	6,857	$	1,207,237
Pass watch	—		—		—		23,272		37,938		5,472		—		66,682
Special mention	24,142		577		8,883		7,002		138		12,245		—		52,987
Substandard	2,105		4,631		—		1,956		63		12,756		—		21,511
Doubtful	—		—		—		—		—		134		—		134
Total commercial real estate	$	165,052	$	242,082	$	294,521	$	142,692	$	219,216	$	278,131	$	6,857	$	1,348,551
Commercial loans:
Pass	$	108,205	$	221,819	$	41,605	$	17,819	$	6,368	$	8,280	$	146,516	$	550,612
Pass watch	43		2,313		1,199		2,004		1,487		—		378		7,424
Special mention	280		—		718		416		36		385		320		2,155
Substandard	185		454		989		481		2		—		1,486		3,597
Doubtful	—		382		95		449		31		—		—		957
Total commercial loans	$	108,713	$	224,968	$	44,606	$	21,169	$	7,924	$	8,665	$	148,700	$	564,745
Municipal loans:
Pass	$	14,748	$	69,822	$	66,741	$	32,166	$	59,756	$	163,144	$	—	$	406,377
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	14,748	$	69,822	$	66,741	$	32,166	$	59,756	$	163,144	$	—	$	406,377
Loans to individuals:
Pass	$	12,798	$	39,592	$	20,715	$	8,079	$	3,672	$	2,079	$	3,521	$	90,456
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		47		—		—		4		51
Substandard	—		19		34		22		27		10		—		112
Doubtful	—		67		—		5		44		83		—		199
Total loans to individuals	$	12,798	$	39,678	$	20,749	$	8,153	$	3,743	$	2,172	$	3,525	$	90,818
Total loans	$	367,033	$	890,010	$	713,390	$	343,496	$	371,569	$	750,939	$	280,161	$	3,716,598

December 31, 2020	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2020		2019		2018		2017		2016		Prior
Construction real estate:
Pass	$	155,693	$	180,536	$	76,090	$	55,636	$	3,191	$	8,297	$	101,793	$	581,236
Pass watch	—		—		—		—		23		—		—		23
Special mention	—		—		—		—		—		—		—		—
Substandard	—		382		62		—		—		58		—		502
Doubtful	—		—		—		—		—		180		—		180
Total construction real estate	$	155,693	$	180,918	$	76,152	$	55,636	$	3,214	$	8,535	$	101,793	$	581,941
1-4 family residential real estate:
Pass	$	154,003	$	114,063	$	70,621	$	55,557	$	57,680	$	255,003	$	2,833	$	709,760
Pass watch	—		—		—		—		267		564		—		831
Special mention	—		—		—		—		—		10		—		10
Substandard	1,473		—		135		427		1,588		5,134		96		8,853
Doubtful	—		—		—		36		103		359		—		498
Total 1-4 family residential real estate	$	155,476	$	114,063	$	70,756	$	56,020	$	59,638	$	261,070	$	2,929	$	719,952
Commercial real estate:
Pass	$	270,087	$	307,161	$	143,177	$	162,180	$	98,828	$	179,919	$	6,957	$	1,168,309
Pass watch	—		—		3,153		40,125		1,696		2,582		—		47,556
Special mention	4,555		33,020		7,041		140		4,531		7,850		—		57,137
Substandard	7,542		—		2,097		65		704		12,282		—		22,690
Doubtful	—		—		—		—		—		54		—		54
Total commercial real estate	$	282,184	$	340,181	$	155,468	$	202,510	$	105,759	$	202,687	$	6,957	$	1,295,746
Commercial loans:
Pass	$	313,688	$	47,446	$	20,386	$	7,505	$	3,392	$	6,142	$	140,018	$	538,577
Pass watch	2,599		1,318		2,410		1,981		—		—		370		8,678
Special mention	304		809		433		39		286		265		455		2,591
Substandard	405		1,081		473		7		—		—		4,417		6,383
Doubtful	310		53		475		54		1		—		—		893
Total commercial loans	$	317,306	$	50,707	$	24,177	$	9,586	$	3,679	$	6,407	$	145,260	$	557,122
Municipal loans:
Pass	$	72,542	$	68,132	$	33,735	$	61,170	$	25,387	$	148,062	$	—	$	409,028
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	72,542	$	68,132	$	33,735	$	61,170	$	25,387	$	148,062	$	—	$	409,028
Loans to individuals:
Pass	$	46,722	$	25,302	$	10,132	$	4,716	$	1,867	$	917	$	3,900	$	93,556
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		51		—		—		—		4		55
Substandard	6		35		28		30		9		11		1		120
Doubtful	73		20		6		55		81		24		—		259
Total loans to individuals	$	46,801	$	25,357	$	10,217	$	4,801	$	1,957	$	952	$	3,905	$	93,990
Total loans	$	1,030,002	$	779,358	$	370,505	$	389,723	$	199,634	$	627,713	$	260,844	$	3,657,779

Aging of past due loans by class of loan

The following tables present the aging of the amortized cost basis in past due loans by class of loans (in thousands):

	March 31, 2021
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current		Total
Real estate loans:
Construction	$	1,130	$	—	$	—	$	1,130	$	604,547	$	605,677
1-4 family residential	5,321		614		486		6,421		694,009		700,430
Commercial	4,676		—		—		4,676		1,343,875		1,348,551
Commercial loans	1,507		245		641		2,393		562,352		564,745
Municipal loans	—		—		—		—		406,377		406,377
Loans to individuals	418		30		3		451		90,367		90,818
Total	$	13,052	$	889	$	1,130	$	15,071	$	3,701,527	$	3,716,598

	December 31, 2020
	30-59 Days Past Due		60-89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Current		Total
Real estate loans:
Construction	$	95	$	14	$	444	$	553	$	581,388	$	581,941
1-4 family residential	7,872		2,469		2,830		13,171		706,781		719,952
Commercial	467		315		86		868		1,294,878		1,295,746
Commercial loans	1,423		4,516		323		6,262		550,860		557,122
Municipal loans	64		—		—		64		408,964		409,028
Loans to individuals	519		123		27		669		93,321		93,990
Total	$	10,440	$	7,437	$	3,710	$	21,587	$	3,636,192	$	3,657,779

Nonperforming assets by asset class

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

	March 31, 2021		December 31, 2020
Nonaccrual loans:
Real estate loans:
Construction	$	248	$	640
1-4 family residential	1,929		3,922
Commercial	1,229		1,269
Commercial loans	1,682		1,592
Loans to individuals	226		291
Total nonaccrual loans (1)	5,314		7,714
Accruing loans past due more than 90 days	—		—
TDR loans	9,641		9,646
OREO	412		106
Repossessed assets	—		14
Total nonperforming assets	$	15,367	$	17,480

(1)    Includes $889,000 and $976,000 of restructured loans as of March 31, 2021 and December 31, 2020, respectively.

Troubled debt restructurings

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

	Three Months Ended March 31, 2021
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real estate loans:
1-4 family residential	$	—	$	—	$	130	$	130	2
Commercial loans	—		—		18		18		1
Total	$	—	$	—	$	148	$	148	3

	Three Months Ended March 31, 2020
	Extend Amortization  Period		Interest Rate Reductions		Combination		Total Modifications		Number of Loans
Real estate loans:
Commercial	$	—	$	—	$	59	$	59	1
Commercial loans	—		—		3		3		1
Total	$	—	$	—	$	62	$	62	2

Allowance for loan losses activity 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 March 31, 2021
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	6,490	$	2,270	$	35,709	$	4,107	$	46	$	384	$	49,006
Loans charged-off	—		(73)		—		(319)		—		(403)		(795)
Recoveries of loans charged-off	1		55		—		282		—		284		622
Net loans (charged-off) recovered	1		(18)		—		(37)		—		(119)		(173)
Provision for (reversal of) loan losses	1,710		256		(8,473)		(962)		—		90		(7,379)
Balance at end of period	$	8,201	$	2,508	$	27,236	$	3,108	$	46	$	355	$	41,454

	Three Months Ended March 31, 2020
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,539	$	3,833	$	9,572	$	6,351	$	570	$	932	$	24,797
Impact of CECL adoption - cumulative effect adjustment	2,968		(1,447)		7,730		(3,532)		(522)		(125)		5,072
Impact of CECL adoption - purchased loans with credit deterioration	(15)		(6)		333		(22)		—		(59)		231
Loans charged-off	(33)		(54)		(21)		(296)		—		(591)		(995)
Recoveries of loans charged-off	11		4		69		74		—		293		451
Net loans (charged-off) recovered	(22)		(50)		48		(222)		—		(298)		(544)
Provision for (reversal of) loan losses(1)	3,184		310		18,437		1,944		(1)		208		24,082
Balance at end of period	$	9,654	$	2,640	$	36,120	$	4,519	$	47	$	658	$	53,638

(1)    The increase in the provision for credit losses during 2020 was primarily due to the economic impact of COVID-19 on macroeconomic factors used in the CECL model.

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Borrowing Arrangements (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Schedule of Debt

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

	March 31, 2021			December 31, 2020
Other borrowings:
Balance at end of period	$	22,315		$	23,172
Average amount outstanding during the period (1)	23,522			91,940
Maximum amount outstanding during the period (2)	24,549			219,259
Weighted average interest rate during the period (3)	0.2		%	0.4		%
Interest rate at end of period (4)	0.2		%	0.1		%
FHLB borrowings:
Balance at end of period	$	665,530		$	832,527
Average amount outstanding during the period (1)	727,513			1,032,269
Maximum amount outstanding during the period (2)	723,584			1,274,370
Weighted average interest rate during the period (3)	1.1		%	1.1		%
Interest rate at end of period (4)	1.1		%	1.0		%

(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.

Schedule of Maturities of Borrowings

Maturities of the obligations associated with our borrowing arrangements based on scheduled repayments at March 31, 2021 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
Other borrowings	$	22,315	$	—	$	—	$	—	$	—	$	—	$	22,315
FHLB borrowings	661,659		687		717		748		775		944		665,530
Total obligations	$	683,974	$	687	$	717	$	748	$	775	$	944	$	687,845

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Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Information related to our long-term debt is summarized as follows for the periods presented (in thousands):    

	March 31, 2021		December 31, 2020
Subordinated notes: (1)
3.875% Subordinated notes, net of unamortized debt issuance costs (2)	$	98,469	$	98,497
5.50% Subordinated notes, net of unamortized debt issuance costs (3)	98,799		98,754
Total Subordinated notes	197,268		197,251
Trust preferred subordinated debentures: (4)
Southside Statutory Trust III, net of unamortized debt issuance costs (5)	20,564		20,563
Southside Statutory Trust IV	23,196		23,196
Southside Statutory Trust V	12,887		12,887
Magnolia Trust Company I	3,609		3,609
Total Trust preferred subordinated debentures	60,256		60,255
Total Long-term debt	$	257,524	$	257,506

(1)This debt consists of subordinated notes with a remaining maturity greater than one year that qualify under the risk-based capital guidelines as Tier 2 capital, subject to certain limitations.

(2)The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.5 million at March 31, 2021 and December 31, 2020.

(3)The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.2 million at March 31, 2021 and December 31, 2020.

(4)This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.

(5)The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $55,000 at March 31, 2021 and $56,000 at December 31, 2020.

Schedule of Subordinated Borrowing

As of March 31, 2021, the details of the subordinated notes and the trust preferred subordinated debentures are summarized below (dollars in thousands):

	Date Issued	Amount Issued		Fixed or Floating Rate	Interest Rate	Maturity Date
3.875% Subordinated Notes	November 6, 2020	$	100,000	Fixed-to-Floating	3.875%	November 15, 2030
5.50% Subordinated Notes	September 19, 2016	$	100,000	Fixed-to-Floating	5.50%	September 30, 2026
Southside Statutory Trust III	September 4, 2003	$	20,619	Floating	3 month LIBOR + 2.94%	September 4, 2033
Southside Statutory Trust IV	August 8, 2007	$	23,196	Floating	3 month LIBOR + 1.30%	October 30, 2037
Southside Statutory Trust V	August 10, 2007	$	12,887	Floating	3 month LIBOR + 2.25%	September 15, 2037
Magnolia Trust Company I (1)	October 10, 2007	$	3,609	Floating	3 month LIBOR + 1.80%	November 23, 2035

(1)On October 10, 2007, as part of an acquisition we assumed $3.6 million of floating rate junior subordinated debentures issued in 2005 to Magnolia Trust Company I.

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Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [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 March 31,
	Defined Benefit Pension Plan				Defined Benefit Pension Plan Acquired				Restoration Plan
	2021		2020		2021		2020		2021		2020
Service cost	$	—	$	423	$	—	$	—	$	—	$	85
Interest cost	628		837		24		41		121		160
Expected return on assets	(1,437)		(1,668)		(58)		(84)		—		—
Net loss amortization	520		533		3		2		118		193
Prior service (credit) cost amortization	—		(3)		—		—		—		2
Net periodic benefit (income) cost	$	(289)	$	122	$	(31)	$	(41)	$	239	$	440

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Derivative Financial Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

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

	March 31, 2021						December 31, 2020
			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	$	625,000	$	2,145	$	11,189	$	670,000	$	—	$	21,635
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	217,655		910		10,980		152,280		—		18,537
Swaps-Customer counterparties	217,655		10,980		910		152,280		18,537		—
Gross derivatives			14,035		23,079				18,537		40,172
Offsetting derivative assets/liabilities			(3,055)		(3,055)				—		—
Cash collateral received/posted			—		(19,114)				—		(39,270)
Net derivatives included in the consolidated balance sheets (2)			$	10,980	$	910			$	18,537	$	902

(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 $1.3 million credit exposure related to interest rate swaps with financial institutions and $11.0 million related to interest rate swaps with customers at March 31, 2021. We had no credit exposure related to interest rate swaps with financial institutions and $18.5 million related to interest rate swaps with customers at December 31, 2020. 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

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 fixed pay swaps are based on one-month or three-month LIBOR rates in effect at March 31, 2021 and December 31, 2020:

	March 31, 2021							December 31, 2020
			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	$	625,000	3.8	0.14	%	1.11	%	$	670,000	3.8	0.17	%	1.12	%
Swaps-Non-hedging
Financial institution counterparties	217,655		11.0	0.52	%	2.43	%	152,280		9.8	0.50	%	2.57	%
Customer counterparties	217,655		11.0	2.43	%	0.52	%	152,280		9.8	2.57	%	0.50	%

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Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2021

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):

			Fair Value Measurements at the End of the Reporting Period Using
March 31, 2021	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	$	42,477	$	42,477	$	—	$	—
State and political subdivisions	1,591,645		—		1,591,645		—
Other stocks and bonds	92,783		—		92,783		—
MBS: (1)
Residential	707,074		—		707,074		—
Commercial	112,945		—		112,945		—
Equity investments:
Equity investments	5,988		5,988		—		—
Derivative assets:
Interest rate swaps	14,035		—		14,035		—
Total asset recurring fair value measurements	$	2,566,947	$	48,465	$	2,518,482	$	—
Derivative liabilities:
Interest rate swaps	$	23,079	$	—	$	23,079	$	—
Total liability recurring fair value measurements	$	23,079	$	—	$	23,079	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	412	$	—	$	—	$	412
Collateral-dependent loans (2)	10,223		—		—		10,223
Total asset nonrecurring fair value measurements	$	10,635	$	—	$	—	$	10,635

			Fair Value Measurements at the End of the Reporting Period Using
December 31, 2020	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:
State and political subdivisions	$	1,580,594	$	—	$	1,580,594	$	—
Other stocks and bonds	78,255		—		78,255		—
MBS: (1)
Residential	810,010		—		810,010		—
Commercial	118,446		—		118,446		—
Equity investments:
Equity investments	6,094		6,094		—		—
Derivative assets:
Interest rate swaps	18,537		—		18,537		—
Total asset recurring fair value measurements	$	2,611,936	$	6,094	$	2,605,842	$	—
Derivative liabilities:
Interest rate swaps	$	40,172	$	—	$	40,172	$	—
Total liability recurring fair value measurements	$	40,172	$	—	$	40,172	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	120	$	—	$	—	$	120
Collateral-dependent loans (2)	10,653		—		—		10,653
Total asset nonrecurring fair value measurements	$	10,773	$	—	$	—	$	10,773

(1)All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

(2)Consists of individually evaluated loans. Loans for which the fair value of the collateral and commercial real estate fair value of the properties is less than cost basis are presented net of 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
March 31, 2021	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	107,623	$	107,623	$	107,623	$	—	$	—
Investment securities:
HTM, at carrying value	908		917		—		917		—
MBS:
HTM, at carrying value	97,251		103,260		—		103,260		—
FHLB stock, at cost	18,754		18,754		—		18,754		—
Equity investments	5,816		5,816		—		5,816		—
Loans, net of allowance for loan losses	3,675,144		3,833,854		—		—		3,833,854
Loans held for sale	2,615		2,615		—		2,615		—
Financial liabilities:
Deposits	$	5,092,643	$	5,095,397	$	—	$	5,095,397	$	—
Other borrowings	22,315		22,315		—		22,315		—
FHLB borrowings	665,530		675,135		—		675,135		—
Subordinated notes, net of unamortized debt issuance costs	197,268		198,103		—		198,103		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,256		47,183		—		47,183		—

			Estimated Fair Value
December 31, 2020	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	108,408	$	108,408	$	108,408	$	—	$	—
Investment securities:
HTM, at carrying value	907		920		—		920		—
Mortgage-backed securities:
HTM, at carrying value	108,091		117,278		—		117,278		—
Federal Home Loan Bank stock, at cost	25,259		25,259		—		25,259		—
Equity investments	5,811		5,811		—		5,811		—
Loans, net of allowance for loan losses	3,608,773		3,784,291		—		—		3,784,291
Loans held for sale	3,695		3,695		—		3,695		—
Financial liabilities:
Deposits	$	4,932,322	$	4,936,188	$	—	$	4,936,188	$	—
Other borrowings	23,172		23,172		—		23,172		—
FHLB borrowings	832,527		854,865		—		854,865		—
Subordinated notes, net of unamortized debt issuance costs	197,251		198,391		—		198,391		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,255		51,993		—		51,993		—

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Income Taxes Income Taxes (Tables)

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

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

	Three Months Ended March 31,
	2021		2020
Current income tax expense	$	2,589	$	5,554
Deferred income tax expense (benefit)	2,161		(5,075)
Income tax expense	$	4,750	$	479

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Off-Balance-Sheet Arrangements, Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Off-balance-sheet, Allowance for off-balance-sheet credit exposures

Allowance for off-balance-sheet credit exposures were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Balance at beginning of period	$	6,386	$	1,455
Impact of CECL adoption	—		4,840
Provision for (reversal of) off-balance-sheet credit exposures	(2,770)		1,165
Balance at end of period	$	3,616	$	7,460

Schedule of unused commitments

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

	March 31, 2021		December 31, 2020
Commitments to extend credit	$	811,574	$	793,138
Standby letters of credit	10,825		13,658
Total	$	822,399	$	806,796

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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic and Diluted Earnings:
Net income	$ 34,091	$ 3,953
Basic weighted-average shares outstanding (in shares)	32,829	33,691
Add: Stock awards (in shares)	108	114
Diluted weighted-average shares outstanding (in shares)	32,937	33,805
Basic earnings per share:
Earnings per common share - basic (in dollars per share)	$ 1.04	$ 0.12
Diluted earnings per share:
Earnings per common share - diluted (in dollars per share)	$ 1.04	$ 0.12
Antidilutive securities excluded from calculating earnings
Number of antidilutive options (in shares)	679	775

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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		$ 875,297	$ 804,580
Income tax benefit (expense)		7,840	(7,789)
Ending balance, net of tax		858,597	795,800
Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		116,078	38,038
Other comprehensive (loss) income before reclassifications		(48,979)	61,486
Reclassification adjustments included in net income		(1,587)	(5,420)
Income tax benefit (expense)		10,619	(11,774)
Net current-period other comprehensive (loss) income, net of tax		(39,947)	44,292
Ending balance, net of tax		76,131	82,330
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		(17,091)	(1,672)
Other comprehensive (loss) income before reclassifications		11,023	(19,600)
Reclassification adjustments included in net income		1,568	(101)
Income tax benefit (expense)		(2,644)	4,137
Net current-period other comprehensive (loss) income, net of tax		9,947	(15,564)
Ending balance, net of tax		(7,144)	(17,236)
Net Prior Service (Cost) Credit
AOCI Attributable to Parent, Net of Tax
Reclassification adjustments included in net income	[1]	0	(1)
Net Gain (Loss)
AOCI Attributable to Parent, Net of Tax
Reclassification adjustments included in net income	[1]	641	728
Total
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		69,080	4,236
Other comprehensive (loss) income before reclassifications		(37,956)	41,886
Reclassification adjustments included in net income		622	(4,794)
Income tax benefit (expense)		7,840	(7,789)
Net current-period other comprehensive (loss) income, net of tax		(29,494)	29,303
Ending balance, net of tax		39,586	33,539
Pension Plans | Net Prior Service (Cost) Credit
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		149	(145)
Other comprehensive (loss) income before reclassifications		0	0
Reclassification adjustments included in net income		0	(1)
Income tax benefit (expense)		0	0
Net current-period other comprehensive (loss) income, net of tax		0	(1)
Ending balance, net of tax		149	(146)
Pension Plans | Net Gain (Loss)
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax		(30,056)	(31,985)
Other comprehensive (loss) income before reclassifications		0	0
Reclassification adjustments included in net income		641	728
Income tax benefit (expense)		(135)	(152)
Net current-period other comprehensive (loss) income, net of tax		506	576
Ending balance, net of tax		$ (29,550)	$ (31,409)

[1] These AOCI 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
		Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized gains and losses		$ 416	$ 121
Tax benefit (expense)		(4,750)	(479)
Realized net gain on sale of securities		2,003	5,541
Total reclassifications for the period, net of tax		(491)	3,787
Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		1,587	5,420
Realized net gain (loss) on interest rate swap derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(1,568)	101
Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[1]	(641)	(728)
Prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[1]	0	1
Amortization of pension plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(641)	(727)
Tax benefit		135	152
Total reclassifications for the period, net of tax		(506)	(575)
Unrealized gains and losses on securities transferred | Reclassification out of accumulated other comprehensive income | Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized gains and losses	[2]	(416)	(121)
Tax benefit (expense)		87	25
Net of tax		(329)	(96)
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)		(420)	(1,164)
Net of tax		1,583	4,377
Realized net gain on sale of securities	[3]	2,003	5,541
Interest rate swap derivatives | Reclassification out of accumulated other comprehensive income | Realized net gain (loss) on interest rate swap derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit (expense)		329	(19)
Net of tax		(1,239)	74
Realized net (loss) gain on interest rate swap derivatives	[4]	(1,568)	93
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)		0	(1)
Net of tax		0	7
Realized net (loss) gain on interest rate swap derivatives	[4]	$ 0	$ 8

[1] These AOCI components are included in the computation of net periodic pension cost (income) presented in “Note 8 – Employee Benefit Plans.”

[2] Included in interest income on the consolidated statements of income.

[3] Listed as net gain on sale of securities AFS on the consolidated statements of income.

[4] Included in interest expense for FHLB borrowings on the consolidated statements of income.

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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Available-for-sale [Abstract]
Amortized Cost		$ 2,448,113	$ 2,437,513
Gross unrealized gains		108,763	150,074
Gross unrealized losses		9,952	282
Securities available for sale, at estimated fair value		2,546,924	2,587,305
HELD TO MATURITY
Amortized cost		98,159	108,998
Gross unrealized gains		6,018	9,200
Gross unrealized losses		0	0
Estimated Fair Value		104,177	118,198
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		42,818
Gross unrealized gains		8
Gross unrealized losses		349
Securities available for sale, at estimated fair value		42,477
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		1,528,516	1,475,030
Gross unrealized gains		71,813	105,601
Gross unrealized losses		8,684	37
Securities available for sale, at estimated fair value		1,591,645	1,580,594
HELD TO MATURITY
Amortized cost		908	907
Gross unrealized gains		9	13
Gross unrealized losses		0	0
Estimated Fair Value		917	920
Other stocks and bonds
Available-for-sale [Abstract]
Amortized Cost		91,439	77,224
Gross unrealized gains		1,560	1,053
Gross unrealized losses		216	22
Securities available for sale, at estimated fair value		92,783	78,255
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	675,795	771,409
Gross unrealized gains	[1]	31,580	38,674
Gross unrealized losses	[1]	301	73
Securities available for sale, at estimated fair value	[1]	707,074	810,010
HELD TO MATURITY
Amortized cost	[1]	45,274	47,948
Gross unrealized gains	[1]	3,006	4,187
Gross unrealized losses	[1]	0	0
Estimated Fair Value	[1]	48,280	52,135
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	109,545	113,850
Gross unrealized gains	[1]	3,802	4,746
Gross unrealized losses	[1]	402	150
Securities available for sale, at estimated fair value	[1]	112,945	118,446
HELD TO MATURITY
Amortized cost	[1]	51,977	60,143
Gross unrealized gains	[1]	3,003	5,000
Gross unrealized losses	[1]	0	0
Estimated Fair Value	[1]	$ 54,980	$ 65,143

[1] All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value	$ 270,170	$ 39,898
More than 12 Months, fair value	0	0
Total fair value	270,170	39,898
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss	9,952	282
More than 12 Months, unrealized Loss	0	0
Total unrealized loss	9,952	282
US Treasury Securities
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value	23,599
More than 12 Months, fair value	0
Total fair value	23,599
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss	349
More than 12 Months, unrealized Loss	0
Total unrealized loss	349
State and political subdivisions
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value	205,469	17,305
More than 12 Months, fair value	0	0
Total fair value	205,469	17,305
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss	8,684	37
More than 12 Months, unrealized Loss	0	0
Total unrealized loss	8,684	37
Other stocks and bonds
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value	28,845	11,562
More than 12 Months, fair value	0	0
Total fair value	28,845	11,562
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss	216	22
More than 12 Months, unrealized Loss	0	0
Total unrealized loss	216	22
Residential
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value	7,769	6,287
More than 12 Months, fair value	0	0
Total fair value	7,769	6,287
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss	301	73
More than 12 Months, unrealized Loss	0	0
Total unrealized loss	301	73
Commercial
Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months, fair value	4,488	4,744
More than 12 Months, fair value	0	0
Total fair value	4,488	4,744
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, unrealized loss	402	150
More than 12 Months, unrealized Loss	0	0
Total unrealized loss	$ 402	$ 150

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Securities - Interest Income on Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt Securities [Abstract]
US Treasury	$ 37	$ 0
State and political subdivisions	10,406	6,625
Other stocks and bonds	845	93
Mortgage-backed securities	6,088	11,534
Total interest income on securities	$ 17,376	$ 18,252

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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available for sale, Amortized Cost
Due in one year or less	$ 1,036
Due after one year through five years	32,542
Due after five years through ten years	93,914
Due after ten years	1,535,281
Total available-for-sale investment securities	1,662,773
MBS:	785,340
Amortized Cost	2,448,113	$ 2,437,513
Available for sale, Fair Value
Due in one year or less	1,061
Due after one year through five years	33,937
Due after five years through ten years	96,177
Due after ten years	1,595,730
Total available-for-sale investment securities	1,726,905
MBS:	820,019
Total	2,546,924	2,587,305
Held to maturity, Amortized Cost
Due in one year or less	120
Due after one year through five years	509
Due after five years through ten years	279
Due after ten years	0
Total held-to-maturity investment securities	908
Mortgage-backed securities	97,251
Amortized cost	98,159	108,998
Held to maturity, Fair Value
Due in one year or less	121
Due after one year through five years	514
Due after five years through ten years	282
Due after ten years	0
Total held-to-maturity investment securities	917
Mortgage-backed securities	103,260
Total	$ 104,177	$ 118,198

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Securities - Unrealized and Realized Gain (Loss) Recognized in Net Income on Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, All Other Investments [Abstract]
Net (losses) gains recognized during the period on equity investments	$ (107)	$ 53
Less: Net gains recognized during the period on equity investments sold during the period	0	0
Unrealized (losses) gains recognized during the reporting period on equity investments held at the reporting date	$ (107)	$ 53

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Securities - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	$ 0	$ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		$ 0
Debt Securities, Held-to-maturity, Credit Loss Expense (Reversal)	0	0
Transferred Securities, Unrealized Loss, Before Tax	2,400,000		2,900,000
Securities transferred, Unrealized Loss, Net of Tax	1,900,000		2,300,000
Fair value of securities transferred from AFS to HTM	0		0
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Net gain on sale of securities AFS	2,003,000	5,541,000
Gross realized gains on AFS securities	2,100,000	5,600,000
Gross realized losses on AFS securities	52,000	10,000
Carrying value of investment securities pledged as collateral	1,470,000,000		1,560,000,000
Equity investments	11,804,000		11,905,000
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Sale of HTM portfolio	0	$ 0
Interest receivable	27,438,000		38,708,000
Debt Securities, Held-to-maturity, Nonaccrual	0		0
Debt Securities, Held-to-maturity, Past Due	0		0
FHLB stock with other-than-temporary impairment	0
Other-than-temporarily impaired equity investments	0
Available-for-sale Securities
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Interest receivable	13,400,000		22,000,000.0
Held-to-maturity Securities
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Interest receivable	$ 259,000		$ 298,000

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Loans and Allowance for Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Abstract]
Loans	$ 3,716,598	$ 3,657,779
Less: Allowance for loan losses	41,454	49,006	$ 53,638	$ 24,797
Total loans	3,675,144	3,608,773
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	605,677	581,941
Less: Allowance for loan losses	8,201	6,490	9,654	3,539
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	700,430	719,952
Less: Allowance for loan losses	2,508	2,270	2,640	3,833
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	1,348,551	1,295,746
Less: Allowance for loan losses	27,236	35,709	36,120	9,572
Commercial loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	564,745	557,122
Less: Allowance for loan losses	3,108	4,107	4,519	6,351
Municipal loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	406,377	409,028
Less: Allowance for loan losses	46	46	47	570
Loans to individuals
Loans and Leases Receivable Disclosure [Abstract]
Loans	90,818	93,990
Less: Allowance for loan losses	$ 355	$ 384	$ 658	$ 932

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Loans and Allowance for Loan Losses - Loans by Credit Quality Indicator and Origination Year (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 367,033	$ 1,030,002
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	890,010	779,358
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	713,390	370,505
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	343,496	389,723
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	371,569	199,634
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	750,939	627,713
Revolving Loans Amortized Cost Basis	280,161	260,844
Loans	3,716,598	3,657,779
Construction Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	26,255	155,693
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	160,527	180,918
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	182,708	76,152
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	75,317	55,636
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	33,261	3,214
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,130	8,535
Revolving Loans Amortized Cost Basis	118,479	101,793
Loans	605,677	581,941
Construction Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	26,255	155,693
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	160,527	180,536
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	182,708	76,090
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	75,258	55,636
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	33,261	3,191
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,877	8,297
Revolving Loans Amortized Cost Basis	118,479	101,793
Loans	605,365	581,236
Construction Real Estate Loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	23
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	22	0
Revolving Loans Amortized Cost Basis	0	0
Loans	22	23
Construction Real Estate Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Construction Real Estate Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	382
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	62
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	54	58
Revolving Loans Amortized Cost Basis	0	0
Loans	54	502
Construction Real Estate Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	59	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	177	180
Revolving Loans Amortized Cost Basis	0	0
Loans	236	180
1-4 Family Residential Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	39,467	155,476
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	152,933	114,063
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	104,065	70,756
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	63,999	56,020
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	47,669	59,638
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	289,697	261,070
Revolving Loans Amortized Cost Basis	2,600	2,929
Loans	700,430	719,952
1-4 Family Residential Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	39,457	154,003
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	151,235	114,063
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	104,065	70,621
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	63,864	55,557
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	46,692	57,680
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	283,115	255,003
Revolving Loans Amortized Cost Basis	2,506	2,833
Loans	690,934	709,760
1-4 Family Residential Real Estate Loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	267
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	823	564
Revolving Loans Amortized Cost Basis	0	0
Loans	823	831
1-4 Family Residential Real Estate Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	65	10
Revolving Loans Amortized Cost Basis	0	0
Loans	65	10
1-4 Family Residential Real Estate Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	10	1,473
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,684	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	135
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	427
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	943	1,588
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	5,289	5,134
Revolving Loans Amortized Cost Basis	94	96
Loans	8,020	8,853
1-4 Family Residential Real Estate Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	14	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	135	36
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	34	103
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	405	359
Revolving Loans Amortized Cost Basis	0	0
Loans	588	498
Commercial Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	165,052	282,184
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	242,082	340,181
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	294,521	155,468
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	142,692	202,510
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	219,216	105,759
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	278,131	202,687
Revolving Loans Amortized Cost Basis	6,857	6,957
Loans	1,348,551	1,295,746
Commercial Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	138,805	270,087
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	236,874	307,161
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	285,638	143,177
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	110,462	162,180
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	181,077	98,828
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	247,524	179,919
Revolving Loans Amortized Cost Basis	6,857	6,957
Loans	1,207,237	1,168,309
Commercial Real Estate Loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	3,153
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	23,272	40,125
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	37,938	1,696
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	5,472	2,582
Revolving Loans Amortized Cost Basis	0	0
Loans	66,682	47,556
Commercial Real Estate Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	24,142	4,555
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	577	33,020
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	8,883	7,041
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,002	140
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	138	4,531
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	12,245	7,850
Revolving Loans Amortized Cost Basis	0	0
Loans	52,987	57,137
Commercial Real Estate Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	2,105	7,542
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,631	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	2,097
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,956	65
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	63	704
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	12,756	12,282
Revolving Loans Amortized Cost Basis	0	0
Loans	21,511	22,690
Commercial Real Estate Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	134	54
Revolving Loans Amortized Cost Basis	0	0
Loans	134	54
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	108,713	317,306
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	224,968	50,707
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	44,606	24,177
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	21,169	9,586
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,924	3,679
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,665	6,407
Revolving Loans Amortized Cost Basis	148,700	145,260
Loans	564,745	557,122
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	108,205	313,688
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	221,819	47,446
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	41,605	20,386
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	17,819	7,505
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,368	3,392
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,280	6,142
Revolving Loans Amortized Cost Basis	146,516	140,018
Loans	550,612	538,577
Commercial loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	43	2,599
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,313	1,318
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,199	2,410
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,004	1,981
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,487	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	378	370
Loans	7,424	8,678
Commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	280	304
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	809
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	718	433
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	416	39
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	36	286
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	385	265
Revolving Loans Amortized Cost Basis	320	455
Loans	2,155	2,591
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	185	405
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	454	1,081
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	989	473
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	481	7
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	1,486	4,417
Loans	3,597	6,383
Commercial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	310
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	382	53
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	95	475
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	449	54
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	31	1
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	957	893
Municipal loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	14,748	72,542
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	69,822	68,132
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	66,741	33,735
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	32,166	61,170
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	59,756	25,387
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	163,144	148,062
Revolving Loans Amortized Cost Basis	0	0
Loans	406,377	409,028
Municipal loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	14,748	72,542
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	69,822	68,132
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	66,741	33,735
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	32,166	61,170
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	59,756	25,387
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	163,144	148,062
Revolving Loans Amortized Cost Basis	0	0
Loans	406,377	409,028
Municipal loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Municipal loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Municipal loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Municipal loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Loans to individuals
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	12,798	46,801
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	39,678	25,357
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	20,749	10,217
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	8,153	4,801
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,743	1,957
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,172	952
Revolving Loans Amortized Cost Basis	3,525	3,905
Loans	90,818	93,990
Loans to individuals | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	12,798	46,722
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	39,592	25,302
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	20,715	10,132
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	8,079	4,716
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,672	1,867
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,079	917
Revolving Loans Amortized Cost Basis	3,521	3,900
Loans	90,456	93,556
Loans to individuals | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Loans to individuals | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	51
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	47	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	4	4
Loans	51	55
Loans to individuals | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	6
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	19	35
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	34	28
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	22	30
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	27	9
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	10	11
Revolving Loans Amortized Cost Basis	0	1
Loans	112	120
Loans to individuals | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	73
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	67	20
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	6
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5	55
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	44	81
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	83	24
Revolving Loans Amortized Cost Basis	0	0
Loans	$ 199	$ 259

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Loans and Allowance for Loan Losses - Aging of Past Due Loans by Class of Loan (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 15,071	$ 21,587
Current	3,701,527	3,636,192
Total loans	3,716,598	3,657,779
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	13,052	10,440
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	889	7,437
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,130	3,710
Construction Real Estate Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	1,130	553
Current	604,547	581,388
Total loans	605,677	581,941
Construction Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,130	95
Construction Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	14
Construction Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	444
1-4 Family Residential Real Estate Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	6,421	13,171
Current	694,009	706,781
Total loans	700,430	719,952
1-4 Family Residential Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,321	7,872
1-4 Family Residential Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	614	2,469
1-4 Family Residential Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	486	2,830
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	4,676	868
Current	1,343,875	1,294,878
Total loans	1,348,551	1,295,746
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,676	467
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	315
Commercial Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	86
Commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	2,393	6,262
Current	562,352	550,860
Total loans	564,745	557,122
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,507	1,423
Commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	245	4,516
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	641	323
Municipal loans
Financing Receivable, Past Due [Line Items]
Total Past Due	0	64
Current	406,377	408,964
Total loans	406,377	409,028
Municipal loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	64
Municipal loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Municipal loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Loans to individuals
Financing Receivable, Past Due [Line Items]
Total Past Due	451	669
Current	90,367	93,321
Total loans	90,818	93,990
Loans to individuals | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	418	519
Loans to individuals | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	30	123
Loans to individuals | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 3	$ 27

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Loans and Allowance for Loan Losses - Nonperforming Assets by Asset Class (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Nonperforming Assets [Line Items]
Restructured nonaccrual loans		$ 889	$ 976
Nonperforming Assets
Nonperforming Assets [Line Items]
Nonaccrual loans	[1]	5,314	7,714
Accruing loans past due more than 90 days		0	0
TDR loans		9,641	9,646
OREO		412	106
Repossessed assets		0	14
Total nonperforming assets		15,367	17,480
Nonperforming Assets | Construction Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		248	640
Nonperforming Assets | 1-4 Family Residential Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		1,929	3,922
Nonperforming Assets | Commercial Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		1,229	1,269
Nonperforming Assets | Commercial loans
Nonperforming Assets [Line Items]
Nonaccrual loans		1,682	1,592
Nonperforming Assets | Loans to individuals
Nonperforming Assets [Line Items]
Nonaccrual loans		$ 226	$ 291

[1] Includes $889,000 and $976,000 of restructured loans as of March 31, 2021 and December 31, 2020, respectively.

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Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) contract	Mar. 31, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | contract	3	2
Total Modifications	$ 148	$ 62
1-4 Family Residential Real Estate Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | contract	2
Total Modifications	$ 130
Commercial Real Estate Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | contract		1
Total Modifications		$ 59
Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | contract	1	1
Total Modifications	$ 18	$ 3
Extended Amortization Period
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0	0
Extended Amortization Period | 1-4 Family Residential Real Estate Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
Extended Amortization Period | Commercial Real Estate Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications		0
Extended Amortization Period | Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0	0
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0	0
Interest Rate Reduction | 1-4 Family Residential Real Estate Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
Interest Rate Reduction | Commercial Real Estate Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications		0
Interest Rate Reduction | Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0	0
Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	148	62
Combination | 1-4 Family Residential Real Estate Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	130
Combination | Commercial Real Estate Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications		59
Combination | Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	$ 18	$ 3

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Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	$ 49,006	$ 24,797
Loans charged-off	(795)	(995)
Recoveries of loans charged-off	622	451
Net loans (charged-off) recovered	(173)	(544)
Provision for (reversal of) loan losses	(7,379)	24,082	[1]
Balance at end of period	41,454	53,638
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	6,490	3,539
Loans charged-off	0	(33)
Recoveries of loans charged-off	1	11
Net loans (charged-off) recovered	1	(22)
Provision for (reversal of) loan losses	1,710	3,184	[1]
Balance at end of period	8,201	9,654
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,270	3,833
Loans charged-off	(73)	(54)
Recoveries of loans charged-off	55	4
Net loans (charged-off) recovered	(18)	(50)
Provision for (reversal of) loan losses	256	310	[1]
Balance at end of period	2,508	2,640
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	35,709	9,572
Loans charged-off	0	(21)
Recoveries of loans charged-off	0	69
Net loans (charged-off) recovered	0	48
Provision for (reversal of) loan losses	(8,473)	18,437	[1]
Balance at end of period	27,236	36,120
Commercial loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	4,107	6,351
Loans charged-off	(319)	(296)
Recoveries of loans charged-off	282	74
Net loans (charged-off) recovered	(37)	(222)
Provision for (reversal of) loan losses	(962)	1,944	[1]
Balance at end of period	3,108	4,519
Municipal loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	46	570
Loans charged-off	0	0
Recoveries of loans charged-off	0	0
Net loans (charged-off) recovered	0	0
Provision for (reversal of) loan losses	0	(1)	[1]
Balance at end of period	46	47
Loans to individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	384	932
Loans charged-off	(403)	(591)
Recoveries of loans charged-off	284	293
Net loans (charged-off) recovered	(119)	(298)
Provision for (reversal of) loan losses	90	208	[1]
Balance at end of period	$ 355	658
Impact of CECL adoption
Allowances for Loan Losses [Roll Forward]
Impact of CECL adoption - cumulative effect adjustment		5,072
Impact of CECL adoption - purchased loans with credit deterioration		231
Impact of CECL adoption | Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Impact of CECL adoption - cumulative effect adjustment		2,968
Impact of CECL adoption - purchased loans with credit deterioration		(15)
Impact of CECL adoption | 1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Impact of CECL adoption - cumulative effect adjustment		(1,447)
Impact of CECL adoption - purchased loans with credit deterioration		(6)
Impact of CECL adoption | Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Impact of CECL adoption - cumulative effect adjustment		7,730
Impact of CECL adoption - purchased loans with credit deterioration		333
Impact of CECL adoption | Commercial loans
Allowances for Loan Losses [Roll Forward]
Impact of CECL adoption - cumulative effect adjustment		(3,532)
Impact of CECL adoption - purchased loans with credit deterioration		(22)
Impact of CECL adoption | Municipal loans
Allowances for Loan Losses [Roll Forward]
Impact of CECL adoption - cumulative effect adjustment		(522)
Impact of CECL adoption - purchased loans with credit deterioration		0
Impact of CECL adoption | Loans to individuals
Allowances for Loan Losses [Roll Forward]
Impact of CECL adoption - cumulative effect adjustment		(125)
Impact of CECL adoption - purchased loans with credit deterioration		$ (59)

[1] The increase in the provision for credit losses during 2020 was primarily due to the economic impact of COVID-19 on macroeconomic factors used in the CECL model.

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Loans and Allowance for Loan Losses - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest receivable	$ 27,438,000		$ 38,708,000
TDRs restructured	148,000	$ 62,000
Reversal of interest income on nonaccrual loans	18,000	121,000
Nonaccrual loans, no allowance	1,600,000		2,200,000
Loans	3,716,598,000		3,657,779,000
Collateral-dependent loans	11,200,000		11,500,000
Allowance for Credit Loss	41,454,000	53,638,000	49,006,000	$ 24,797,000
Loans in process of foreclosure	234,000		1,200,000
Commitments to lend additional funds on Troubled Debt Restructurings (TDR)	0	0
COVID-19 Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	1,700,000		47,200,000
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Owner and nonowner-occupied real estate	1,250,000,000
Loans secured by multi-family properties	81,600,000
Loans secured by farmland	15,000,000.0
TDRs restructured		59,000
Loans	$ 1,348,551,000		1,295,746,000
General Loan Term	20 years
Allowance for Credit Loss	$ 27,236,000	36,120,000	35,709,000	9,572,000
1-4 Family Residential Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
TDRs restructured	130,000
Loans	700,430,000		719,952,000
Allowance for Credit Loss	$ 2,508,000	2,640,000	2,270,000	3,833,000
1-4 Family Residential Real Estate Loans | Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term	5 years
1-4 Family Residential Real Estate Loans | Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term	30 years
Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	$ 220,900,000		214,800,000
Allowance for Credit Loss	0
Commercial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
TDRs restructured	18,000	3,000
Loans	564,745,000		557,122,000
Allowance for Credit Loss	3,108,000	$ 4,519,000	4,107,000	$ 6,351,000
Loan portfolio
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest receivable	$ 13,800,000		$ 16,400,000

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Borrowing Arrangements (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Other borrowings		$ 22,315	$ 23,172
FHLB borrowings		665,530	832,527
Other borrowings:
Debt Instrument [Line Items]
Other borrowings		22,315	23,172
Average amount outstanding during the period	[1]	23,522	91,940
Maximum amount outstanding during the period	[2]	$ 24,549	$ 219,259
Weighted average interest rate during the period	[3]	0.20%	0.40%
Interest rate at end of the period	[4]	0.20%	0.10%
FHLB borrowings:
Debt Instrument [Line Items]
FHLB borrowings		$ 665,530	$ 832,527
Average amount outstanding during the period	[1]	727,513	1,032,269
Maximum amount outstanding during the period	[2]	$ 723,584	$ 1,274,370
Weighted average interest rate during the period	[3]	1.10%	1.10%
Interest rate at end of the period	[4]	1.10%	1.00%

[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.

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Borrowings Maturities Table (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Less than 1 Year	$ 683,974
1-2 Years	687
2-3 Years	717
3-4 Years	748
4-5 Years	775
Thereafter	944
Total	687,845
Other borrowings:
Debt Instrument [Line Items]
Less than 1 Year	22,315
1-2 Years	0
2-3 Years	0
3-4 Years	0
4-5 Years	0
Thereafter	0
Total	22,315
FHLB borrowings:
Debt Instrument [Line Items]
Less than 1 Year	661,659
1-2 Years	687
2-3 Years	717
3-4 Years	748
4-5 Years	775
Thereafter	944
Total	$ 665,530

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Borrowing Arrangements Narrative (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) agreement oustanding_letters_of_credit credit_line Rate	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Number of credit lines maintained by the Company | credit_line	3
Carrying value of investment securities pledged as collateral	$ 1,470,000,000	$ 1,560,000,000
Federal funds purchased	0	0
Letters of Credit, Federal Home Loan Bank, as collateral	$ 0
Maturity of repurchase agreements (less than)	1 year
Securities sold under repurchase agreements	$ 22,300,000	23,200,000
Federal Home Loan Bank borrowings, additional funding available	1,250,000,000
Borrowings with variable interest rate, face amount	625,000,000.0
Frost Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	40,000,000.0
Line of credit, capacity available for issuance of letters of credit	$ 5,000,000.0
Number of outstanding letters of credit | oustanding_letters_of_credit	1
Letters of Credit Outstanding, Amount	$ 91,000
TIB - The Independent Bankers Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	15,000,000.0
Comerica Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	7,500,000
Federal Reserve Discount Window
Line of Credit Facility [Line Items]
Additional funding available	$ 618,100,000
Minimum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	0.08%
Federal Home Loan Bank borrowings maturities	5 days
Maximum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	4.799%
Federal Home Loan Bank borrowings maturities	7 years 3 months 18 days
Variable Rate Agreements and Fixed Short-term Pay Agreements
Line of Credit Facility [Line Items]
Borrowings with variable interest rate, face amount	$ 625,000,000.0	670,000,000.0
Three-Month London Interbank Offered Rate (LIBOR) | Variable Rate Agreements and Fixed Short-term Pay Agreements
Line of Credit Facility [Line Items]
Description of variable and fixed rate basis	three-month LIBOR
Three-Month London Interbank Offered Rate (LIBOR) | Variable Rate Agreements and Fixed Short-term Pay Agreements | Maximum
Line of Credit Facility [Line Items]
Debt Instrument, Number Of Variable Rate Advance Agreements | agreement	6
One-Month London Interbank Offered Rate (LIBOR) | Variable Rate Agreements and Fixed Short-term Pay Agreements
Line of Credit Facility [Line Items]
Description of variable and fixed rate basis	one-month LIBOR
Cash flow hedging | Variable Rate Agreements and Fixed Short-term Pay Agreements
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate During Period | Rate	1.11%
Derivative, Average Remaining Maturity	3 years 9 months 18 days
Federal Reserve Discount Window
Line of Credit Facility [Line Items]
Other borrowings	$ 0	$ 0

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Long-term Debt Other Long-term Debt (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021		Dec. 31, 2020		Nov. 06, 2020	Sep. 19, 2016	Oct. 10, 2007	[5]	Aug. 10, 2007	Aug. 08, 2007	Sep. 04, 2003
Debt Instruments [Abstract]
Subordinated notes, net of unamortized debt issuance costs:	[1]	$ 197,268		$ 197,251
Trust preferred subordinated debentures	[2]	60,256		60,255
Total long-term debt		257,524		257,506
5.50% Subordinated Notes
Debt Instruments [Abstract]
Subordinated notes, net of unamortized debt issuance costs:	[1],[3]	98,799		98,754
Unamortized Debt Issuance Expense		$ 1,200		1,200
Stated interest rate		5.50%					5.50%
Southside Statutory Trust III, net of unamortized debt issuance costs
Debt Instruments [Abstract]
Trust preferred subordinated debentures		$ 20,564	[2],[4]	20,563	[2],[4]							$ 20,619
Unamortized Debt Issuance Expense		55		56
Southside Statutory Trust IV
Debt Instruments [Abstract]
Trust preferred subordinated debentures		23,196	[2]	23,196	[2]						$ 23,196
Southside Statutory Trust V
Debt Instruments [Abstract]
Trust preferred subordinated debentures		12,887	[2]	12,887	[2]					$ 12,887
Magnolia Trust Company I
Debt Instruments [Abstract]
Trust preferred subordinated debentures		3,609	[2]	3,609	[2]			$ 3,609
3.875% Subordinated Notes
Debt Instruments [Abstract]
Subordinated notes, net of unamortized debt issuance costs:	[1],[6]	98,469		98,497
Unamortized Debt Issuance Expense		$ 1,500		$ 1,500
Stated interest rate		3.875%				3.875%
Minimum | 5.50% Subordinated Notes
Debt Instruments [Abstract]
Long-term debt, remaining maturity, greater than		1 year

[1] This debt consists of subordinated notes with a remaining maturity greater than one year that qualify under the risk-based capital guidelines as Tier 2 capital, subject to certain limitations.

[2] This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.

[3] The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.2 million at March 31, 2021 and December 31, 2020.

[4] The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $55,000 at March 31, 2021 and $56,000 at December 31, 2020.

[5] On October 10, 2007, as part of an acquisition we assumed $3.6 million of floating rate junior subordinated debentures issued in 2005 to Magnolia Trust Company I.

[6] The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.5 million at March 31, 2021 and December 31, 2020.

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Long-term Debt LT Debt Interest Rates (Details) - USD ($) $ in Thousands		Nov. 14, 2025	Sep. 30, 2021	Nov. 06, 2020	Sep. 19, 2016	Oct. 10, 2007		Aug. 10, 2007	Aug. 08, 2007	Sep. 04, 2003	Mar. 31, 2021		Dec. 31, 2020
Debt Instrument [Line Items]
Other long-term debt	[1]										$ 60,256		$ 60,255
5.50% Subordinated Notes
Debt Instrument [Line Items]
Amount issued					$ 100,000
Stated interest rate					5.50%						5.50%
Southside Statutory Trust III
Debt Instrument [Line Items]
Other long-term debt										$ 20,619	$ 20,564	[1],[2]	20,563	[1],[2]
Southside Statutory Trust III | Three-Month London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis on variable rate										2.94%
Southside Statutory Trust IV
Debt Instrument [Line Items]
Other long-term debt									$ 23,196		23,196	[1]	23,196	[1]
Southside Statutory Trust IV | Three-Month London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis on variable rate									1.30%
Southside Statutory Trust V
Debt Instrument [Line Items]
Other long-term debt								$ 12,887			12,887	[1]	12,887	[1]
Southside Statutory Trust V | Three-Month London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis on variable rate								2.25%
Magnolia Trust Company I
Debt Instrument [Line Items]
Other long-term debt						$ 3,609	[3]				$ 3,609	[1]	$ 3,609	[1]
Magnolia Trust Company I | Three-Month London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis on variable rate						1.80%
3.875% Subordinated Notes
Debt Instrument [Line Items]
Amount issued				$ 100,000
Stated interest rate				3.875%							3.875%
Forecast | 5.50% Subordinated Notes | Three-Month London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis on variable rate			4.297%
Forecast | 3.875% Subordinated Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis on variable rate		3.66%

[1] This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.

[2] The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $55,000 at March 31, 2021 and $56,000 at December 31, 2020.

[3] On October 10, 2007, as part of an acquisition we assumed $3.6 million of floating rate junior subordinated debentures issued in 2005 to Magnolia Trust Company I.

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Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 423
Interest cost	628	837
Expected return on assets	(1,437)	(1,668)
Net loss amortization	520	533
Prior service (credit) cost amortization	0	(3)
Net periodic benefit cost (income)	(289)	122
Defined Benefit Pension Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	24	41
Expected return on assets	(58)	(84)
Net loss amortization	3	2
Prior service (credit) cost amortization	0	0
Net periodic benefit cost (income)	(31)	(41)
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	85
Interest cost	121	160
Expected return on assets	0	0
Net loss amortization	118	193
Prior service (credit) cost amortization	0	2
Net periodic benefit cost (income)	$ 239	$ 440

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Derivative Financial Instruments and Hedging Activities - Schedule Of Derivative Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Asset Derivative
Gross derivatives		$ 14,035	$ 18,537
Offsetting derivative assets		(3,055)	0
Cash collateral received/posted		0	0
Net derivatives included in the consolidated balance sheets	[1]	10,980	18,537
Liability Derivative
Gross derivatives		23,079	40,172
Offsetting derivative liabilities		(3,055)	0
Cash collateral received/posted		(19,114)	(39,270)
Net derivatives included in the consolidated balance sheets	[1]	910	902
Financial Institution Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		1,300	0
Financial Institution Counterparties | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	625,000	670,000
Asset Derivative
Gross derivatives		2,145	0
Liability Derivative
Gross derivatives		11,189	21,635
Financial Institution Counterparties | Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	217,655	152,280
Asset Derivative
Gross derivatives		910	0
Liability Derivative
Gross derivatives		10,980	18,537
Customer Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		11,000	18,500
Customer Counterparties | Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	217,655	152,280
Asset Derivative
Gross derivatives		10,980	18,537
Liability Derivative
Gross derivatives		$ 910	$ 0

[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 $1.3 million credit exposure related to interest rate swaps with financial institutions and $11.0 million related to interest rate swaps with customers at March 31, 2021. We had no credit exposure related to interest rate swaps with financial institutions and $18.5 million related to interest rate swaps with customers at December 31, 2020. 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		3 Months Ended	12 Months Ended
		Mar. 31, 2021	Dec. 31, 2020
Financial Institution Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 217,655	$ 152,280
Remaining Maturity		11 years	9 years 9 months 18 days
Weighted Average Receive Rate		0.52%	0.50%
Weighted Average Pay Rate		2.43%	2.57%
Financial Institution Counterparties | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 625,000	$ 670,000
Remaining Maturity		3 years 9 months 18 days	3 years 9 months 18 days
Weighted Average Receive Rate		0.14%	0.17%
Weighted Average Pay Rate		1.11%	1.12%
Customer Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 217,655	$ 152,280
Remaining Maturity		11 years	9 years 9 months 18 days
Weighted Average Receive Rate		2.43%	2.57%
Weighted Average Pay Rate		0.52%	0.50%

[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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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Debt face amount	$ 625,000,000.0
Cash collateral held by counterparties subject to master netting agreements	19,100,000	$ 39,300,000
Cash collateral receivable that was not offset against derivative liabilities	$ 1,300,000

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Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		$ 2,546,924	$ 2,587,305
Derivative assets	[1]	10,980	18,537
Derivative liabilities	[1]	910	902
US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		42,477
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		1,591,645	1,580,594
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		92,783	78,255
Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[2]	707,074	810,010
Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[2]	112,945	118,446
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments		5,988	6,094
Total asset fair value measurements		2,566,947	2,611,936
Total liability fair value measurements		23,079	40,172
Fair Value, Recurring | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		42,477
Fair Value, Recurring | 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		1,591,645	1,580,594
Fair Value, Recurring | 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		92,783	78,255
Fair Value, Recurring | Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[3]	707,074	810,010
Fair Value, Recurring | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value	[3]	112,945	118,446
Fair Value, Recurring | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		14,035	18,537
Derivative liabilities		23,079	40,172
Fair Value, Recurring | 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		5,988	6,094
Total asset fair value measurements		48,465	6,094
Total liability fair value measurements		0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		42,477
Fair Value, Recurring | 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	0
Fair Value, Recurring | 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	0
Fair Value, Recurring | 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	[3]	0	0
Fair Value, Recurring | 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	[3]	0	0
Fair Value, Recurring | 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, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments		0	0
Total asset fair value measurements		2,518,482	2,605,842
Total liability fair value measurements		23,079	40,172
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		0
Fair Value, Recurring | 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		1,591,645	1,580,594
Fair Value, Recurring | 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		92,783	78,255
Fair Value, Recurring | 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	[3]	707,074	810,010
Fair Value, Recurring | 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	[3]	112,945	118,446
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		14,035	18,537
Derivative liabilities		23,079	40,172
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments		0	0
Total asset fair value measurements		0	0
Total liability fair value measurements		0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at estimated fair value		0
Fair Value, Recurring | 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	0
Fair Value, Recurring | 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	0
Fair Value, Recurring | 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	[3]	0	0
Fair Value, Recurring | 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	[3]	0	0
Fair Value, Recurring | 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, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets		412	120
Total asset fair value measurements		10,635	10,773
Fair Value, Nonrecurring | Collateral-dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	10,223	10,653
Fair Value, Nonrecurring | 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
Total asset fair value measurements		0	0
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	0	0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets		0	0
Total asset fair value measurements		0	0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2) | Collateral-dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	0	0
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets		412	120
Total asset fair value measurements		10,635	10,773
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral-dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	$ 10,223	$ 10,653

[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 $1.3 million credit exposure related to interest rate swaps with financial institutions and $11.0 million related to interest rate swaps with customers at March 31, 2021. We had no credit exposure related to interest rate swaps with financial institutions and $18.5 million related to interest rate swaps with customers at December 31, 2020. 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 MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

[3] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

[4] Consists of individually evaluated loans. Loans for which the fair value of the collateral and commercial real estate fair value of the properties is less than cost basis are presented net of 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	Mar. 31, 2021	Dec. 31, 2020
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 107,623	$ 108,408
Investment securities:
HTM, at carrying value	908	907
Mortgage-backed securities:
HTM, at carrying value	97,251	108,091
Federal Home Loan Bank stock, at cost	18,754	25,259
Equity investments	5,816	5,811
Loans, net of allowance for loan losses	3,675,144	3,608,773
Loans held for sale	2,615	3,695
Financial liabilities:
Deposits	5,092,643	4,932,322
Other borrowings	22,315	23,172
FHLB borrowings	665,530	832,527
Subordinated notes, net of unamortized debt issuance costs	197,268	197,251
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,256	60,255
Estimated Fair Value
Financial assets:
Cash and cash equivalents	107,623	108,408
Investment securities:
HTM, at carrying value	917	920
Mortgage-backed securities:
HTM, at carrying value	103,260	117,278
Federal Home Loan Bank stock, at cost	18,754	25,259
Equity investments	5,816	5,811
Loans, net of allowance for loan losses	3,833,854	3,784,291
Loans held for sale	2,615	3,695
Financial liabilities:
Deposits	5,095,397	4,936,188
Other borrowings	22,315	23,172
FHLB borrowings	675,135	854,865
Subordinated notes, net of unamortized debt issuance costs	198,103	198,391
Trust preferred subordinated debentures, net of unamortized debt issuance costs	47,183	51,993
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	107,623	108,408
Investment securities:
HTM, at carrying value	0	0
Mortgage-backed securities:
HTM, at carrying value	0	0
Federal Home Loan Bank 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
Other borrowings	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:
HTM, at carrying value	917	920
Mortgage-backed securities:
HTM, at carrying value	103,260	117,278
Federal Home Loan Bank stock, at cost	18,754	25,259
Equity investments	5,816	5,811
Loans, net of allowance for loan losses	0	0
Loans held for sale	2,615	3,695
Financial liabilities:
Deposits	5,095,397	4,936,188
Other borrowings	22,315	23,172
FHLB borrowings	675,135	854,865
Subordinated notes, net of unamortized debt issuance costs	198,103	198,391
Trust preferred subordinated debentures, net of unamortized debt issuance costs	47,183	51,993
Estimated Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Investment securities:
HTM, at carrying value	0	0
Mortgage-backed securities:
HTM, at carrying value	0	0
Federal Home Loan Bank stock, at cost	0	0
Equity investments	0	0
Loans, net of allowance for loan losses	3,833,854	3,784,291
Loans held for sale	0	0
Financial liabilities:
Deposits	0	0
Other borrowings	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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Fair Value Measurement Narrative (Details)	3 Months Ended
	Mar. 31, 2021 source
Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of third party sources used to validate prices, in some cases	2
Derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of third party sources used to validate prices, in some cases	2

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Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Current income tax expense	$ 2,589	$ 5,554
Deferred income tax expense (benefit)	2,161	(5,075)
Income tax expense	$ 4,750	$ 479

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Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Deferred tax liability, net	$ 9,900,000		$ 15,500,000
Deferred tax assets, valuation allowance	0		$ 0
Income tax expense	$ 4,750,000	$ 479,000
Effective income tax rate, percent	12.20%	10.80%

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Off-Balance-Sheet Arrangements, Allowance for off-balance-sheet credit exposures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 6,386	$ 1,455
Provision for (reversal of) off-balance-sheet credit exposures	(2,770)	1,165
Balance at end of period	3,616	7,460
Impact of CECL adoption
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 0	$ 4,840

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Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 822,399	$ 806,796
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	811,574	793,138
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 10,825	$ 13,658

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Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) contract	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Leases:
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,100,000	$ 227,000
Lessee, Operating Lease, Number of Contracts | contract	1
Operating lease ROU assets	$ 15,788,000		$ 15,063,000
Securities:
Unsettled trades to purchase securities	23,473,000	14,596,000	0
Unsettled trades to sell securities	0	$ 67,247,000	0
Deposits:
Unsettled Issuances of Brokered CDs	0		0
Operating Leased Assets [Line Items]
Operating lease ROU assets	15,788,000		$ 15,063,000
Operating lease
Leases:
Operating lease ROU assets	1,100,000
Operating Leased Assets [Line Items]
Operating lease ROU assets	$ 1,100,000