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, 2023

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 25, 2023 was 30,924,812 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	38
ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	59
ITEM 4.  CONTROLS AND PROCEDURES	60
PART II.  OTHER INFORMATION
ITEM 1.  LEGAL PROCEEDINGS	60
ITEM 1A.  RISK FACTORS	60
ITEM 2.  UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	62
ITEM 3.  DEFAULTS UPON SENIOR SECURITIES	62
ITEM 4.  MINE SAFETY DISCLOSURES	62
ITEM 5.  OTHER INFORMATION	62
ITEM 6.  EXHIBITS	63
EXHIBIT INDEX	63
SIGNATURES	64

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:
2022 Form 10-K	Company’s Annual Report on Form 10-K for the year ended December 31, 2022
401(k) Plan	401(k) Defined Contribution Plan
Acquired Retirement Plan	OmniAmerican Bank defined benefit pension plan
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
BTFP	The Federal Reserve’s Bank Term Funding Program
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	ASC 326, 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	United States generally accepted accounting principles
GSEs	U.S. government-sponsored enterprises

Southside Bancshares, Inc. |1

Guidelines	Interagency Guidelines Prescribing Standards for Safety and Soundness adopted by federal banking agencies
HTM	Held to maturity
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
Repurchase agreements	Securities sold under agreements to repurchase
Restoration Plan	Nonfunded supplemental retirement plan
Retirement Plan	Defined benefit pension 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 prior to implementation of ASU 2022-02 “Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures”
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, 2023		December 31, 2022
ASSETS
Cash and due from banks	$	101,109	$	106,143
Interest earning deposits	151,999		9,276
Federal funds sold	57,384		83,833
Total cash and cash equivalents	310,492		199,252
Securities:
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	1,437,222		1,299,014
Securities HTM (estimated fair value of $1,172,574 and $1,149,156, respectively)	1,308,457		1,326,729
FHLB stock, at cost	16,696		9,190
Equity investments	9,909		11,181
Loans held for sale	407		667
Loans:
Loans	4,152,644		4,147,691
Less:  Allowance for loan losses	(36,332)		(36,515)
Net loans	4,116,312		4,111,176
Premises and equipment, net	141,363		141,256
Operating lease ROU assets	15,183		15,314
Goodwill	201,116		201,116
Other intangible assets, net	4,144		4,622
Interest receivable	34,890		49,350
Deferred tax asset, net	33,787		34,695
Unsettled trades to sell securities	4,044		—
BOLI	134,635		133,911
Other assets	23,688		21,163
Total assets	$	7,792,345	$	7,558,636
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposits:
Noninterest bearing	$	1,543,413	$	1,671,562
Interest bearing	4,294,807		4,526,457
Total deposits	5,838,220		6,198,019
Other borrowings	625,627		221,153
FHLB borrowings	333,183		153,358
Subordinated notes, net of unamortized debt issuance costs	98,710		98,674
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,266		60,265
Operating lease liabilities	16,989		17,070
Other liabilities	68,320		64,100
Total liabilities	7,041,315		6,812,639
Off-balance-sheet arrangements, commitments and contingencies (Note 12)
Shareholders’ equity:
Common stock:  ($1.25 par value, 80,000,000 shares authorized, 38,008,848 shares issued at March 31, 2023 and 38,000,822 shares issued at December 31, 2022)	47,511		47,501
Paid-in capital	786,119		784,545
Retained earnings	254,565		239,610
Treasury stock: (shares at cost, 6,887,667 at March 31, 2023 and 6,454,192 at December 31, 2022)	(203,853)		(188,203)
AOCI	(133,312)		(137,456)
Total shareholders’ equity	751,030		745,997
Total liabilities and shareholders’ equity	$	7,792,345	$	7,558,636

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,
	2023		2022
Interest income:
Loans	$	54,776	$	34,888
Taxable investment securities	5,712		4,608
Tax-exempt investment securities	13,916		10,219
MBS	4,329		4,017
FHLB stock and equity investments	245		113
Other interest earning assets	1,870		28
Total interest income	80,848		53,873
Interest expense:
Deposits	19,906		3,237
FHLB borrowings	3,141		366
Subordinated notes	999		998
Trust preferred subordinated debentures	1,031		356
Other borrowings	2,418		10
Total interest expense	27,495		4,967
Net interest income	53,353		48,906
Provision for (reversal of) credit losses	(40)		294
Net interest income after provision for credit losses	53,393		48,612
Noninterest income:
Deposit services	6,422		6,628
Net gain (loss) on sale of securities AFS	(2,146)		(1,543)
Net gain on sale of equity securities	2,416		—
Gain on sale of loans	104		178
Trust fees	1,467		1,494
BOLI	1,675		691
Brokerage services	697		809
Other	1,398		2,468
Total noninterest income	12,033		10,725
Noninterest expense:
Salaries and employee benefits	21,856		19,969
Net occupancy	3,734		3,656
Advertising, travel & entertainment	1,050		737
ATM expense	355		281
Professional fees	1,372		927
Software and data processing	2,055		1,631
Communications	327		503
FDIC insurance	544		472
Amortization of intangibles	478		622
Other	3,078		2,397
Total noninterest expense	34,849		31,195
Income before income tax expense	30,577		28,142
Income tax expense	4,543		3,146
Net income	$	26,034	$	24,996
Earnings per common share – basic	$	0.83	$	0.77
Earnings per common share – diluted	$	0.83	$	0.77
Cash dividends paid per common share	$	0.35	$	0.34

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

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SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

(in thousands)

	Three Months Ended
	March 31,
	2023		2022
Net income	$	26,034	$	24,996
Other comprehensive income (loss):
Securities AFS and transferred securities:
Change in unrealized holding gain (loss) on AFS securities during the period	13,019		(161,901)
Change in net unrealized loss on securities transferred from AFS to HTM	—		(39,144)
Reclassification adjustment for amortization related to AFS and HTM debt securities	1,992		243
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income	2,146		1,543
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	(6,976)		20,546
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges	(5,108)		1,322
Pension plans:
Amortization of net actuarial loss, included in net periodic benefit cost	173		206
Other comprehensive income (loss), before tax	5,246		(177,185)
Income tax (expense) benefit related to items of other comprehensive income (loss)	(1,102)		37,209
Other comprehensive income (loss), net of tax	4,144		(139,976)
Comprehensive income (loss)	$	30,178	$	(114,980)

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

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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, 2022	$	47,501	$	784,545	$	239,610	$	(188,203)	$	(137,456)	$	745,997
Net income	—		—		26,034		—		—		26,034
Other comprehensive income (loss)	—		—		—		—		4,144		4,144
Issuance of common stock for dividend reinvestment plan (8,026 shares)	10		292		—		—		—		302
Purchase of common stock (457,394 shares)	—		—		—		(15,945)		—		(15,945)
Stock compensation expense	—		914		—		—		—		914
Net issuance of common stock under employee stock plans (23,919 shares)	—		368		(91)		295		—		572
Cash dividends paid on common stock ($0.35 per share)	—		—		(10,988)		—		—		(10,988)
Balance at March 31, 2023	$	47,511	$	786,119	$	254,565	$	(203,853)	$	(133,312)	$	751,030

Balance at December 31, 2021	$	47,461	$	780,501	$	179,813	$	(155,308)	$	59,705	$	912,172
Net income	—		—		24,996		—		—		24,996
Other comprehensive income (loss)	—		—		—		—		(139,976)		(139,976)
Issuance of common stock for dividend reinvestment plan (7,671 shares)	10		312		—		—		—		322
Purchase of common stock (82,285 shares)	—		—		—		(3,358)		—		(3,358)
Stock compensation expense	—		819		—		—		—		819
Net issuance of common stock under employee stock plans (16,551 shares)	—		182		(67)		154		—		269
Cash dividends paid on common stock ($0.34 per share)	—		—		(11,003)		—		—		(11,003)
Balance at March 31, 2022	$	47,471	$	781,814	$	193,739	$	(158,512)	$	(80,271)	$	784,241

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,
	2023		2022
OPERATING ACTIVITIES:
Net income	$	26,034	$	24,996
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	2,636		2,765
Securities premium amortization (discount accretion), net	3,586		4,804
Loan (discount accretion) premium amortization, net	89		(132)
Provision for (reversal of) credit losses	(40)		294
Stock compensation expense	914		819
Deferred tax expense (benefit)	(194)		285
Net (gain) loss on sale of AFS securities	2,146		1,543
Net (gain) loss on sale of equity securities	(2,416)		—
Loss on impairment of investments	—		38
Net loss on premises and equipment	4		334
Gross proceeds from sales of loans held for sale	4,309		5,114
Gross originations of loans held for sale	(4,049)		(5,006)
Net (gain) loss on OREO	(51)		—
Net change in:
Interest receivable	14,460		10,778
Other assets	(3,082)		(74)
Interest payable	3,253		728
Other liabilities	(23,968)		38,091
Net cash provided by (used in) operating activities	23,631		85,377
INVESTING ACTIVITIES:
Securities AFS:
Purchases	(361,685)		(126,240)
Sales	237,316		118,952
Maturities, calls and principal repayments	8,617		50,269
Securities HTM:
Maturities, calls and principal repayments	14,970		2,216
Proceeds from sales of equity securities	3,785		—
Proceeds from redemption of FHLB stock and equity investments	18,370		11,041
Purchases of FHLB stock and equity investments	(25,973)		(57)
Net loan paydowns (originations)	(5,342)		(155,667)
Purchases of premises and equipment	(2,183)		(2,806)
Proceeds from sales of premises and equipment	—		3
Net proceeds from sales of OREO	144		—
Proceeds from sales of repossessed assets	93		30
Net cash provided by (used in) investing activities	(111,888)		(102,259)
(continued)

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SOUTHSIDE BANCSHARES, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (continued)
(UNAUDITED)
(in thousands)
	Three Months Ended
	March 31,
	2023		2022
FINANCING ACTIVITIES:
Net change in deposits	(359,846)		348,066
Net change in other borrowings	404,474		6,977
Proceeds from FHLB borrowings	1,078,000		117,000
Repayment of FHLB borrowings	(898,175)		(457,167)
Proceeds from stock option exercises	640		332
Cash paid to tax authority related to tax withholding on share-based awards	(68)		(63)
Purchase of common stock	(14,842)		(2,228)
Proceeds from the issuance of common stock for dividend reinvestment plan	302		322
Cash dividends paid	(10,988)		(11,003)
Net cash provided by (used in) financing activities	199,497		2,236
Net increase (decrease) in cash and cash equivalents	111,240		(14,646)
Cash and cash equivalents at beginning of period	199,252		201,753
Cash and cash equivalents at end of period	$	310,492	$	187,107
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	$	24,242	$	4,239
Income taxes paid	$	—	$	—
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	$	13	$	31
Transfer of AFS to HTM securities	$	—	$	424,895
Unsettled trades to purchase securities	$	—	$	(2,053)
Unsettled trades to sell securities	$	4,044	$	47,019
Unsettled trades to repurchase common stock	$	(957)	$	(1,130)

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, 2022. 

Accounting Changes and Reclassifications

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

Current Expected Credit Losses - Troubled Debt Restructurings and Vintage Disclosures

We adopted ASU 2022-02, “Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures” on January 1, 2023, the effective date of the guidance, on a prospective basis. ASU 2022-02 eliminated the accounting guidance for TDRs, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Specifically, rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance to determine whether a modification results in a new loan or a continuation of an existing loan. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. ASU 2022-02 did not have a material impact on our consolidated financial statements.

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. Additionally, in January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848): Scope,” which provided additional clarification that certain optional expedients and exceptions noted above apply to derivative instruments that use an interest rate for margining, discounting or contract price alignment that is modified as a result of reference rate reform. In December 2022, the FASB issued ASU 2022-06, “Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848,” which was effective upon issuance and deferred the sunset date in Topic 848 from December 31, 2022 to December 31, 2024. We established an officer level committee to guide our transition from LIBOR in October 2019 and are transitioning to alternative rates consistent with industry timelines. We continue to evaluate our LIBOR exposure. The trust preferred subordinated debentures will transition to an adjusted SOFR index in accordance with the Federal Reserve final rule implementing the Adjustable Interest Rate Act. Our cash flow hedges will transition to an adjusted SOFR index in accordance with the ISDA 2020 IBOR Fallbacks Protocol. We have identified our products that utilize LIBOR and have implemented enhanced fallback language to facilitate the transition to alternative reference rates. We have evaluated our systems and are offering alternative rates. We are no longer

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offering LIBOR indexed rates on newly originated loans. ASU 2020-04 and ASU 2021-01 are not expected to have a material impact on our consolidated financial statements.

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,
	2023		2022
Basic and Diluted Earnings:
Net income	$	26,034	$	24,996
Basic weighted-average shares outstanding	31,372		32,357
Add:  Stock awards	92		180
Diluted weighted-average shares outstanding	31,464		32,537
Basic earnings per share:
Net income	$	0.83	$	0.77
Diluted earnings per share:
Net income	$	0.83	$	0.77

For the three months ended March 31, 2023, there were approximately 121,000 anti-dilutive shares. For the three months ended March 31, 2022, there were no anti-dilutive shares.

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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, 2023
	Unrealized Gains (Losses) on Securities		Unrealized Gains (Losses) on Derivatives		Retirement Plans		Total
Beginning balance, net of tax	$	(149,181)	$	31,227	$	(19,502)	$	(137,456)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	13,019		(6,976)		—		6,043
Reclassification adjustments included in net income	4,138		(5,108)		173		(797)
Income tax (expense) benefit	(3,603)		2,537		(36)		(1,102)
Net current-period other comprehensive income (loss), net of tax	13,554		(9,547)		137		4,144
Ending balance, net of tax	$	(135,627)	$	21,680	$	(19,365)	$	(133,312)

	Three Months Ended March 31, 2022
	Unrealized Gains (Losses) on Securities		Unrealized Gains (Losses) on Derivatives		Retirement Plans		Total
Beginning balance, net of tax	$	84,716	$	(1,257)	$	(23,754)	$	59,705
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	(201,045)		20,546		—		(180,499)
Reclassification adjustments included in net income	1,786		1,322		206		3,314
Income tax (expense) benefit	41,844		(4,593)		(42)		37,209
Net current-period other comprehensive income (loss), net of tax	(157,415)		17,275		164		(139,976)
Ending balance, net of tax	$	(72,699)	$	16,018	$	(23,590)	$	(80,271)

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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,
	2023		2022
Unrealized gains and losses on securities transferred:
Amortization of unrealized gains and losses (1)	$	(1,992)	$	(243)
Tax benefit	418		51
Net of tax	(1,574)		(192)
Unrealized gains and losses on available for sale securities:
Realized net gain (loss) on sale of securities (2)	(2,146)		(1,543)
Tax (expense) benefit	451		324
Net of tax	(1,695)		(1,219)
Derivatives:
Realized net gain (loss) on interest rate swap derivatives (3)	5,108		(1,322)
Tax benefit	(1,072)		278
Net of tax	4,036		(1,044)
Amortization of pension plan:
Net actuarial loss (4)	(173)		(206)
Tax benefit	36		42
Net of tax	(137)		(164)
Total reclassifications for the period, net of tax	$	630	$	(2,619)

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

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

(3)    Included in interest expense for FHLB borrowings, other borrowings and deposits 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, 2023 and December 31, 2022 are reflected in the tables below (in thousands):

	March 31, 2023
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
U.S. Treasury	$	297,061	$	96	$	—	$	297,157
State and political subdivisions	938,822		2,023		54,373		886,472
Corporate bonds and other	14,513		33		1,135		13,411
MBS: (1)
Residential	237,426		302		7,992		229,736
Commercial	11,313		57		924		10,446
Total	$	1,499,135	$	2,511	$	64,424	$	1,437,222
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	1,038,054	$	8,703	$	126,946	$	919,811
Corporate bonds and other	146,203		561		9,821		136,943
MBS: (1)
Residential	93,399		24		6,282		87,141
Commercial	30,801		—		2,122		28,679
Total	$	1,308,457	$	9,288	$	145,171	$	1,172,574

	December 31, 2022
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
State and political subdivisions	$	1,039,453	$	956	$	75,557	$	964,852
Corporate bonds and other	8,692		26		14		8,704
MBS: (1)
Residential	328,400		250		13,623		315,027
Commercial	11,329		50		948		10,431
Total	$	1,387,874	$	1,282	$	90,142	$	1,299,014
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	1,037,556	$	3,969	$	163,283	$	878,242
Corporate bonds and other	152,552		575		7,993		145,134
MBS: (1)
Residential	93,796		21		8,343		85,474
Commercial	42,825		—		2,519		40,306
Total	$	1,326,729	$	4,565	$	182,138	$	1,149,156

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

From time to time, we transfer securities from AFS to HTM due to overall balance sheet strategies. We had no transferred securities from AFS to HTM during the three months ended March 31, 2023. We transferred securities from AFS to HTM with an estimated fair value of $1.25 billion during the year ended December 31, 2022. The remaining net unamortized, unrealized loss on the transferred securities included in AOCI in the accompanying balance sheets totaled $119.6 million ($94.5 million, net of tax) at March 31, 2023 and $121.5 million ($96.0 million, net of tax) at December 31, 2022. 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

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included in management’s assessment for impairment for each individual security. We transferred these securities due to overall balance sheet strategies, and our management has the current intent and ability to hold these securities until maturity.

Investment securities and MBS with carrying values of $2.13 billion and $1.82 billion were pledged as of March 31, 2023 and December 31, 2022, respectively, to collateralize FHLB borrowings, borrowings from the FRDW, including from the BTFP, repurchase agreements and public fund deposits, for potential liquidity needs or other purposes as required by law.

The following tables present the fair value and unrealized losses on AFS and HTM investment securities and MBS, if applicable, for which an allowance for credit losses has not been recorded as of March 31, 2023 and December 31, 2022, segregated by major security type and length of time in a continuous loss position (in thousands):

	March 31, 2023
	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	$	152,248	$	2,179	$	625,144	$	52,194	$	777,392	$	54,373
Corporate bonds and other	13,193		1,135		—		—		13,193		1,135
MBS:
Residential	155,602		3,903		64,334		4,089		219,936		7,992
Commercial	—		—		8,167		924		8,167		924
Total	$	321,043	$	7,217	$	697,645	$	57,207	$	1,018,688	$	64,424
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	182,401	$	7,385	$	544,200	$	119,561	$	726,601	$	126,946
Corporate bonds and other	95,612		6,228		36,668		3,593		132,280		9,821
MBS:
Residential	20,893		1,114		65,539		5,168		86,432		6,282
Commercial	—		—		28,679		2,122		28,679		2,122
Total	$	298,906	$	14,727	$	675,086	$	130,444	$	973,992	$	145,171
	December 31, 2022
	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	$	859,270	$	68,683	$	26,620	$	6,874	$	885,890	$	75,557
Corporate bonds and other	3,678		14		—		—		3,678		14
MBS:
Residential	306,294		13,623		—		—		306,294		13,623
Commercial	5,613		318		2,545		630		8,158		948
Total	$	1,174,855	$	82,638	$	29,165	$	7,504	$	1,204,020	$	90,142
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	426,382	$	66,898	$	323,385	$	96,385	$	749,767	$	163,283
Corporate bonds and other	125,250		6,660		12,738		1,333		137,988		7,993
Mortgage-backed securities:
Residential	80,801		7,799		3,932		544		84,733		8,343
Commercial	40,306		2,519		—		—		40,306		2,519
Total	$	672,739	$	83,876	$	340,055	$	98,262	$	1,012,794	$	182,138

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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 recognize the loss in 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 temporary 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.

As of March 31, 2023 and December 31, 2022, we did not have an allowance for credit losses on our AFS securities, based on our consideration of the qualitative factors associated with each security type in our AFS portfolio. The unrealized losses on our investment and MBS are due to changes in interest rates and spreads and other market conditions. At March 31, 2023, we had 515 AFS debt securities in an unrealized loss position. 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 corporate bonds and other investment securities consist of investment grade bonds and private placement bonds.

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 or our corporate securities, we currently apply a third-party average loss given default rate to model these securities. We elected to use the specific identification method to model our HTM 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 insignificant. 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 and investment grade corporates and private placement bonds with a long history of no credit losses, no credit loss should be recognized for these securities for the three months ended March 31, 2023 or 2022.

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, 2023, accrued interest receivable on AFS and HTM debt securities totaled $9.8 million and $8.4 million, respectively. As of December 31, 2022, accrued interest receivable on AFS and HTM debt securities totaled $16.9 million and $13.6 million, respectively. No HTM debt securities were past-due or on nonaccrual status as of March 31, 2023 or December 31, 2022.

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

	Three Months Ended March 31,
	2023		2022
U.S. Treasury	$	697	$	168
State and political subdivisions	17,099		13,332
Corporate bonds and other	1,832		1,327
MBS	4,329		4,017
Total interest income on securities	$	23,957	$	18,844

There was a $2.1 million net realized loss as a result of sales from the AFS securities portfolio for the three months ended March 31, 2023, which consisted of $3.2 million in realized losses and $1.1 million in realized gains.  There was a $1.5 million net realized loss as a result of sales from the AFS securities portfolio for the three months ended March 31, 2022, which consisted of $1.8 million in realized losses and $238,000 in realized gains. There were no sales from the HTM portfolio during the three months ended March 31, 2023 or 2022.  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, 2023, are presented below by contractual maturity (in thousands):

	March 31, 2023
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment securities:
Due in one year or less	$	297,272	$	297,367
Due after one year through five years	1,563		1,601
Due after five years through ten years	33,196		32,564
Due after ten years	918,365		865,508
	1,250,396		1,197,040
MBS:	248,739		240,182
Total	$	1,499,135	$	1,437,222

	March 31, 2023
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment securities:
Due in one year or less	$	125	$	125
Due after one year through five years	20,795		20,037
Due after five years through ten years	135,369		126,811
Due after ten years	1,027,968		909,781
	1,184,257		1,056,754
MBS:	124,200		115,820
Total	$	1,308,457	$	1,172,574

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, 2023 and December 31, 2022, we had equity investments recorded in our consolidated balance sheets of $9.9 million and $11.2 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. For the three months ended March 31, 2023, there was a net gain on the sale of equity securities of $2.4 million.

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,
	2023		2022
Net gains (losses) recognized during the period on equity investments	$	2,500	$	(275)
Less: Net gains recognized during the period on equity investments sold during the period	2,416		—
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date	$	84	$	(275)

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, 2023.

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, 2023, 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, 2023		December 31, 2022
Real estate loans:
Construction	$	591,894	$	559,681
1-4 family residential	672,595		663,519
Commercial	1,990,861		1,987,707
Commercial loans	388,182		412,064
Municipal loans	438,566		450,067
Loans to individuals	70,546		74,653
Total loans	4,152,644		4,147,691
Less: Allowance for loan losses	36,332		36,515
Net loans	$	4,116,312	$	4,111,176

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. 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 15 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 residential portfolio.

Commercial Real Estate Loans

Commercial real estate loans as of March 31, 2023 consisted of $1.65 billion of owner and non-owner occupied real estate, $313.4 million of loans secured by multi-family properties and $25.9 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

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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, 2023	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2023		2022		2021		2020		2019		Prior
Construction real estate:
Pass	$	22,665	$	179,803	$	176,130	$	37,195	$	6,980	$	7,789	$	141,330	$	571,892
Pass watch	—		2,434		—		—		—		—		14,808		17,242
Special mention	—		822		1,010		—		9		—		—		1,841
Substandard	—		—		—		—		—		229		—		229
Doubtful	—		299		43		—		348		—		—		690
Total construction real estate	$	22,665	$	183,358	$	177,183	$	37,195	$	7,337	$	8,018	$	156,138	$	591,894
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
1-4 family residential real estate:
Pass	$	13,984	$	92,684	$	144,451	$	126,154	$	68,073	$	220,774	$	2,123	$	668,243
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		78		—		1,381		—		1,459
Substandard	—		2		64		210		124		2,146		42		2,588
Doubtful	—		—		—		—		—		305		—		305
Total 1-4 family residential real estate	$	13,984	$	92,686	$	144,515	$	126,442	$	68,197	$	224,606	$	2,165	$	672,595
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	49	$	—	$	49
Commercial real estate:
Pass	$	137,028	$	754,591	$	523,896	$	156,316	$	111,505	$	263,451	$	10,180	$	1,956,967
Pass watch	—		—		9,001		—		349		—		—		9,350
Special mention	—		—		—		1,820		437		945		—		3,202
Substandard	—		—		—		278		14,395		6,484		—		21,157
Doubtful	—		—		—		—		73		112		—		185
Total commercial real estate	$	137,028	$	754,591	$	532,897	$	158,414	$	126,759	$	270,992	$	10,180	$	1,990,861
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Commercial loans:
Pass	$	17,642	$	101,347	$	61,883	$	16,062	$	7,209	$	6,968	$	161,646	$	372,757
Pass watch	—		73		149		—		—		—		199		421
Special mention	—		183		4,996		27		—		269		8,318		13,793
Substandard	—		418		190		—		86		25		—		719
Doubtful	—		67		73		50		109		193		—		492
Total commercial loans	$	17,642	$	102,088	$	67,291	$	16,139	$	7,404	$	7,455	$	170,163	$	388,182
Current period gross charge-offs	$	—	$	84	$	11	$	14	$	—	$	—	$	—	$	109
Municipal loans:
Pass	$	5,679	$	63,464	$	73,606	$	55,338	$	45,918	$	187,652	$	—	$	431,657
Pass watch	—		—		—		—		507		6,402		—		6,909
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	5,679	$	63,464	$	73,606	$	55,338	$	46,425	$	194,054	$	—	$	438,566
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Loans to individuals:
Pass	$	7,504	$	24,621	$	18,476	$	10,868	$	4,219	$	2,092	$	2,704	$	70,484
Pass watch	—		—		—		—		—		—		10		10
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		5		4		—		9
Doubtful	—		—		6		—		17		20		—		43
Total loans to individuals	$	7,504	$	24,621	$	18,482	$	10,868	$	4,241	$	2,116	$	2,714	$	70,546
Current period gross charge-offs (1)	$	391	$	24	$	6	$	2	$	—	$	52	$	—	$	475
Total loans	$	204,502	$	1,220,808	$	1,013,974	$	404,396	$	260,363	$	707,241	$	341,360	$	4,152,644
Total current period gross charge-offs (1)	$	391	$	108	$	17	$	16	$	—	$	101	$	—	$	633

(1) Includes $391,000 in charged off demand deposit overdrafts reported as 2023 originations.

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December 31, 2022	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2022		2021		2020		2019		2018		Prior
Construction real estate:
Pass	$	169,652	$	184,501	$	34,537	$	7,091	$	1,844	$	6,434	$	152,530	$	556,589
Pass watch	299		—		—		—		—		—		—		299
Special mention	1,858		290		—		—		—		—		—		2,148
Substandard	—		—		—		10		42		194		—		246
Doubtful	—		44		—		355		—		—		—		399
Total construction real estate	$	171,809	$	184,835	$	34,537	$	7,456	$	1,886	$	6,628	$	152,530	$	559,681
1-4 family residential real estate:
Pass	$	82,847	$	144,424	$	128,666	$	70,142	$	36,710	$	194,490	$	2,160	$	659,439
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		79		—		1,397		—		—		1,476
Substandard	3		—		217		54		32		1,942		43		2,291
Doubtful	—		—		—		—		173		140		—		313
Total 1-4 family residential real estate	$	82,850	$	144,424	$	128,962	$	70,196	$	38,312	$	196,572	$	2,203	$	663,519
Commercial real estate:
Pass	$	798,653	$	546,938	$	168,607	$	136,440	$	55,480	$	233,509	$	12,315	$	1,951,942
Pass watch	—		9,219		—		—		—		—		—		9,219
Special mention	—		—		1,832		330		115		1,849		—		4,126
Substandard	—		—		281		14,603		260		6,992		—		22,136
Doubtful	—		—		—		76		—		208		—		284
Total commercial real estate	$	798,653	$	556,157	$	170,720	$	151,449	$	55,855	$	242,558	$	12,315	$	1,987,707
Commercial loans:
Pass	$	113,678	$	68,509	$	17,852	$	8,249	$	4,820	$	3,313	$	178,951	$	395,372
Pass watch	208		13		56		—		—		—		—		277
Special mention	—		5,109		31		—		288		—		9,986		15,414
Substandard	220		116		70		110		12		9		—		537
Doubtful	68		100		—		86		210		—		—		464
Total commercial loans	$	114,174	$	73,847	$	18,009	$	8,445	$	5,330	$	3,322	$	188,937	$	412,064
Municipal loans:
Pass	$	65,258	$	74,617	$	57,147	$	47,636	$	24,576	$	173,919	$	—	$	443,153
Pass watch	—		—		—		508		403		6,003		—		6,914
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	65,258	$	74,617	$	57,147	$	48,144	$	24,979	$	179,922	$	—	$	450,067
Loans to individuals:
Pass	$	29,579	$	21,480	$	12,651	$	5,261	$	1,665	$	1,005	$	2,935	$	74,576
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		1		—		6		—		2		—		9
Doubtful	7		—		—		18		40		3		—		68
Total loans to individuals	$	29,586	$	21,481	$	12,651	$	5,285	$	1,705	$	1,010	$	2,935	$	74,653
Total loans	$	1,262,330	$	1,055,361	$	422,026	$	290,975	$	128,067	$	630,012	$	358,920	$	4,147,691

Watchlisted loans reported as 2023 originations as of March 31, 2023 and watchlisted loans reported as 2022 originations as of December 31, 2022 were, for the majority, first originated in various years prior to 2023 and 2022, respectively, but were renewed in the respective year.

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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, 2023
	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	$	455	$	299	$	—	$	754	$	591,140	$	591,894
1-4 family residential	2,562		48		359		2,969		669,626		672,595
Commercial	763		—		39		802		1,990,059		1,990,861
Commercial loans	1,929		315		94		2,338		385,844		388,182
Municipal loans	—		—		—		—		438,566		438,566
Loans to individuals	221		—		19		240		70,306		70,546
Total	$	5,930	$	662	$	511	$	7,103	$	4,145,541	$	4,152,644

	December 31, 2022
	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	$	43	$	21	$	—	$	64	$	559,617	$	559,681
1-4 family residential	3,529		368		214		4,111		659,408		663,519
Commercial	105		153		415		673		1,987,034		1,987,707
Commercial loans	515		277		247		1,039		411,025		412,064
Municipal loans	—		—		—		—		450,067		450,067
Loans to individuals	203		3		40		246		74,407		74,653
Total	$	4,395	$	822	$	916	$	6,133	$	4,141,558	$	4,147,691

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

	March 31, 2023		December 31, 2022
Nonaccrual loans:
Real estate loans:
Construction	$	695	$	405
1-4 family residential	933		848
Commercial	582		762
Commercial loans	911		757
Loans to individuals	48		74
Total nonaccrual loans (1)	3,169		2,846
Accruing loans past due more than 90 days	—		—
Restructured loans (2)	—		7,849
OREO	—		93
Repossessed assets	11		74
Total nonperforming assets	$	3,180	$	10,862

(1)    Includes $179,000 and $897,000 of restructured loans as of March 31, 2023 and December 31, 2022, respectively.

(2) Pursuant to our adoption of ASU 2022-02, effective January 1, 2023, we prospectively discontinued the recognition and measurement guidance previously required on troubled debt restructures. As a result, “restructured” loans as of March 31, 2023 exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures.

We reversed $26,000 of interest income on nonaccrual loans during the three months ended March 31, 2023, and $12,000 for the three months ended March 31, 2022. We had $1.3 million and $1.6 million of loans on nonaccrual for which there was no related allowance for credit losses as of March 31, 2023 and December 31, 2022, 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, 2023 and December 31, 2022, we had $8.3 million and $8.1 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 no loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of March 31, 2023 and December 31, 2022, respectively.

Restructured Loans

Pursuant to our adoption of ASU 2022-02 effective January 1, 2023, we prospectively discontinued the recognition and measurement of TDRs. This guidance eliminated TDR accounting for loans in which the borrower was experiencing financial difficulty and the creditor granted a concession. See “Note 1 - Summary of Significant Accounting and Reporting Policies” to our consolidated financial statements included in this report.

A loan is now considered restructured if the borrower is experiencing financial difficulties and the loan has been modified. Modifications 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 modifications 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 most instances, interest will continue to be charged on principal balances outstanding during the extended term. Therefore, the financial effects of the recorded investment of loans restructured during the three months ended March 31, 2023 were not significant.

There was one commercial loan for $179,000 that was restructured with an extension of amortization period as of March 31, 2023 and is included in our nonaccrual loans in nonperforming assets.

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On an ongoing basis, the performance of the restructured loans is monitored for subsequent payment default. Payment default is recognized when the borrower is 90 days or more past due. As of March 31, 2023, there were no restructured loans in default. Payment defaults for restructured loans did not significantly impact the determination of the allowance for loan losses in the periods presented. At March 31, 2023, there were no commitments to lend additional funds to borrowers whose loans had been restructured.

Allowance for Loan Losses

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, 2023
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,164	$	2,173	$	28,701	$	2,235	$	45	$	197	$	36,515
Loans charged-off	—		(49)		—		(109)		—		(475)		(633)
Recoveries of loans charged-off	1		5		—		60		—		296		362
Net loans (charged-off) recovered	1		(44)		—		(49)		—		(179)		(271)
Provision for (reversal of) loan losses	(13)		185		20		(285)		(1)		182		88
Balance at end of period	$	3,152	$	2,314	$	28,721	$	1,901	$	44	$	200	$	36,332

	Three Months Ended March 31, 2022
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,787	$	1,866	$	26,980	$	2,397	$	47	$	196	$	35,273
Loans charged-off	—		—		—		(131)		—		(424)		(555)
Recoveries of loans charged-off	—		39		47		216		—		238		540
Net loans (charged-off) recovered	—		39		47		85		—		(186)		(15)
Provision for (reversal of) loan losses	(183)		77		198		(28)		1		201		266
Balance at end of period	$	3,604	$	1,982	$	27,225	$	2,454	$	48	$	211	$	35,524

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, 2023 and December 31, 2022, the accrued interest on our loan portfolio was $16.7 million and $18.8 million, respectively.

Southside Bancshares, Inc. |23

6. Borrowing Arrangements

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

	March 31, 2023			December 31, 2022
Other borrowings:
Balance at end of period	$	625,627		$	221,153
Average amount outstanding during the period (1)	202,135			77,845
Maximum amount outstanding during the period (2)	625,627			316,563
Weighted average interest rate during the period (3)	4.9		%	2.4		%
Interest rate at end of period (4)	4.6		%	4.1		%
FHLB borrowings:
Balance at end of period	$	333,183		$	153,358
Average amount outstanding during the period (1)	404,199			135,926
Maximum amount outstanding during the period (2)	533,242			423,645
Weighted average interest rate during the period (3)	3.2		%	2.4		%
Interest rate at end of period (5)	5.2		%	4.7		%

(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 other borrowings and FHLB borrowings includes the effect of interest rate swaps.

(4)Stated rate.

(5)The interest rate on FHLB borrowings includes the effect of interest rate swaps.

Maturities of the obligations associated with our borrowing arrangements based on scheduled repayments at March 31, 2023 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	$	621,527	$	2,750	$	1,350	$	—	$	—	$	—	$	625,627
FHLB borrowings	330,717		748		775		391		411		141		333,183
Total obligations	$	952,244	$	3,498	$	2,125	$	391	$	411	$	141	$	958,810

Other borrowings may include federal funds purchased, repurchase agreements and borrowings from the Federal Reserve through the FRDW and BTFP. 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, 2023 or December 31, 2022.  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, 2023, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities, was approximately $282.8 million. There were $350.0 million and $188.0 million in borrowings from the FRDW at March 31, 2023 and December 31, 2022, respectively. To provide more stability and to assure banks have the ability to meet the needs of all their depositors, the Federal Reserve created the BTFP in the first quarter of 2023. At March 31, 2023, the amount of additional funding the Bank could obtain from the BTFP, collateralized by securities, was approximately $3.1 million. There were $198.4 million in borrowings from the BTFP at March 31, 2023. 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, 2023, the line had one outstanding letter of credit for $155,000. Southside Bank currently has no outstanding letters of credit from FHLB held as collateral for its public fund deposits.

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Southside Bank enters into sales of securities under repurchase agreements. These repurchase agreements totaled $77.2 million at March 31, 2023 and $33.2 million at December 31, 2022, and had maturities of less than 3.0 years.  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 3.73% to 5.33% and with remaining maturities of 13 days to 5.3 years at March 31, 2023.  FHLB borrowings may be collateralized by FHLB stock, nonspecified loans and/or securities. At March 31, 2023, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by securities, FHLB stock and nonspecified loans and securities, was approximately $1.53 billion, net of FHLB stock purchases required.  

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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, 2023		December 31, 2022
Subordinated notes: (1)
3.875% Subordinated notes, net of unamortized debt issuance costs (2)	$	98,710	$	98,674
Total Subordinated notes	98,710		98,674
Trust preferred subordinated debentures: (3)
Southside Statutory Trust III, net of unamortized debt issuance costs (4)	20,574		20,573
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	60,266		60,265
Total Long-term debt	$	158,976	$	158,939

(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 $1.3 million at March 31, 2023 and December 31, 2022.

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

(4)The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $45,000 at March 31, 2023 and $46,000 at December 31, 2022.

As of March 31, 2023, 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
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)	May 20, 2005	$	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 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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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,
	Retirement Plan				Acquired Retirement Plan				Restoration Plan
	2023		2022		2023		2022		2023		2022
Interest cost	$	925	$	680	$	32	$	26	$	206	$	139
Expected return on assets	(1,143)		(1,461)		(47)		(59)		—		—
Net loss amortization	166		151		—		—		7		55
Net periodic benefit cost (income)	$	(52)	$	(630)	$	(15)	$	(33)	$	213	$	194

The noncash adjustment to the employee benefit plan liabilities, consisting of changes in net loss, was $173,000 and $206,000 for the three months ended March 31, 2023 and 2022, respectively.

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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-parties. 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 $880.0 million of Bank liabilities. 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 or SOFR rate.

During 2022, we entered into partial term fair value hedges, as allowed under ASU 2017-12, for certain of our fixed rate callable AFS municipal securities. The instruments are designated as fair value hedges as the changes in the fair value of the interest rate swap are expected to offset changes in the fair value of the hedged item attributable to changes in the SOFR swap rate, the designated benchmark interest rate. As of March 31, 2023, hedged securities with a carrying amount of $759.7 million are included in our AFS securities portfolio in our consolidated balance sheets. These derivative contracts involve the receipt of floating rate interest from a counterparty in exchange for us making fixed-rate payments over the life of the agreement, without the exchange of the underlying notional value. The change in the fair value of these hedging instruments is recorded in AOCI and is subsequently reclassified into earnings in the period that the hedged transactions affects earnings.

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, 2023 and December 31, 2022, net derivative assets included $53.3 million and $82.1 million, respectively, of cash collateral received from counterparties under master netting agreements.

The notional amounts of the derivative instruments represent the contractual cash flows pertaining to the underlying agreements. These amounts are not exchanged and are not reflected in the consolidated balance sheets. The fair value of the interest rate swaps are presented at net in other assets and other liabilities and in the net change in each of these financial statement line items in the accompanying consolidated statements of cash flows 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, 2023						December 31, 2022
			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	$	880,000	$	32,886	$	5,443	$	575,000	$	39,527	$	—
Swaps-Fair Value Hedge-Financial institution counterparties	742,675		13,035		3,246		742,675		21,733		171
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	220,999		16,018		—		223,124		21,046		—
Swaps-Customer counterparties	220,999		—		16,018		223,124		—		21,046
Gross derivatives			61,939		24,707				82,306		21,217
Offsetting derivative assets/liabilities			(8,689)		(8,689)				(171)		(171)
Cash collateral received/posted			(53,250)		—				(82,135)		—
Net derivatives included in the consolidated balance sheets (2)			$	—	$	16,018			$	—	$	21,046

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

(2)    Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at March 31, 2023 or December 31, 2022. 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 or overnight SOFR rates in effect at March 31, 2023 and December 31, 2022:

	March 31, 2023							December 31, 2022
			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	$	880,000	3.0	4.77	%	2.20	%	$	575,000	2.3	4.44	%	1.13	%
Swaps-Fair Value hedge
Financial institution counterparties	742,675		6.0	4.56	%	3.21	%	742,675		6.3	3.42	%	3.21	%
Swaps-Non-hedging
Financial institution counterparties	220,999		8.8	5.29	%	2.68	%	223,124		9.0	4.83	%	2.69	%
Customer counterparties	220,999		8.8	2.68	%	5.29	%	223,124		9.0	2.69	%	4.83	%

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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 most of 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, 2023 and December 31, 2022.

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 – 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, 2023 and December 31, 2022, 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, 2023	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	$	297,157	$	297,157	$	—	$	—
State and political subdivisions	886,472		—		886,472		—
Corporate bonds and other	13,411		—		13,411		—
MBS: (1)
Residential	229,736		—		229,736		—
Commercial	10,446		—		10,446		—
Equity investments:
Equity investments	5,319		5,319		—		—
Derivative assets:
Interest rate swaps	61,939		—		61,939		—
Total asset recurring fair value measurements	$	1,504,480	$	302,476	$	1,202,004	$	—
Derivative liabilities:
Interest rate swaps	$	24,707	$	—	$	24,707	$	—
Total liability recurring fair value measurements	$	24,707	$	—	$	24,707	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	11	$	—	$	—	$	11
Collateral-dependent loans (2)	7,857		—		—		7,857
Total asset nonrecurring fair value measurements	$	7,868	$	—	$	—	$	7,868

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			Fair Value Measurements at the End of the Reporting Period Using
December 31, 2022	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	$	964,852	$	—	$	964,852	$	—
Corporate bonds and other	8,704		—		8,704		—
MBS: (1)
Residential	315,027		—		315,027		—
Commercial	10,431		—		10,431		—
Equity investments:
Equity investments	5,235		5,235		—		—
Derivative assets:
Interest rate swaps	82,306		—		82,306		—
Total asset recurring fair value measurements	$	1,386,555	$	5,235	$	1,381,320	$	—
Derivative liabilities:
Interest rate swaps	$	21,217	$	—	$	21,217	$	—
Total liability recurring fair value measurements	$	21,217	$	—	$	21,217	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	167	$	—	$	—	$	167
Collateral-dependent loans (2)	7,815		—		—		7,815
Total asset nonrecurring fair value measurements	$	7,982	$	—	$	—	$	7,982

(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. Borrowings from the Federal Reserve through the FRDW and BTFP have original maturities of one year or less, and the fair value 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.

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, 2023	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	310,492	$	310,492	$	310,492	$	—	$	—
Investment securities:
HTM, at carrying value	1,184,257		1,056,754		—		1,056,754		—
MBS:
HTM, at carrying value	124,200		115,820		—		115,820		—
FHLB stock, at cost	16,696		16,696		—		16,696		—
Equity investments	4,590		4,590		—		4,590		—
Loans, net of allowance for loan losses	4,116,312		3,861,859		—		—		3,861,859
Loans held for sale	407		407		—		407		—
Financial liabilities:
Deposits	$	5,838,220	$	5,807,050	$	—	$	5,807,050	$	—
Other borrowings	625,627		630,270		—		630,270		—
FHLB borrowings	333,183		321,144		—		321,144		—
Subordinated notes, net of unamortized debt issuance costs	98,710		89,952		—		89,952		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,266		54,520		—		54,520		—

			Estimated Fair Value
December 31, 2022	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	199,252	$	199,252	$	199,252	$	—	$	—
Investment securities:
HTM, at carrying value	1,190,108		1,023,376		—		1,023,376		—
Mortgage-backed securities:
HTM, at carrying value	136,621		125,780		—		125,780		—
FHLB stock, at cost	9,190		9,190		—		9,190		—
Equity investments	5,946		5,946		—		5,946		—
Loans, net of allowance for loan losses	4,111,176		3,880,664		—		—		3,880,664
Loans held for sale	667		667		—		667		—
Financial liabilities:
Deposits	$	6,198,019	$	6,158,517	$	—	$	6,158,517	$	—
Other borrowings	221,153		221,153		—		221,153		—
FHLB borrowings	153,358		140,976		—		140,976		—
Subordinated notes, net of unamortized debt issuance costs	98,674		91,357		—		91,357		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,265		60,594		—		60,594		—

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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,
	2023		2022
Current income tax expense	$	4,737	$	2,861
Deferred income tax expense (benefit)	(194)		285
Income tax expense	$	4,543	$	3,146

The net deferred tax asset totaled $33.8 million at March 31, 2023 as compared to $34.7 million at December 31, 2022. The decrease in the net deferred tax asset is primarily the result of a decrease in unrealized losses in the AFS securities portfolio.  No valuation allowance was recorded at March 31, 2023 or December 31, 2022, 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, 2023 or December 31, 2022.

We recognized income tax expense of $4.5 million for an ETR of 14.9% for the three months ended March 31, 2023, compared to income tax expense of $3.1 million, for an ETR of 11.2% for the three months ended March 31, 2022. The higher ETR for the three months ended March 31, 2023 was primarily due to a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same period in 2022. The ETR differs from the statutory rate of 21% for the three months ended March 31, 2023 and 2022 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 2019 or Texas state tax examinations by tax authorities for years before 2018.

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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,
	2023		2022
Balance at beginning of period	$	3,687	$	2,384
Provision for (reversal of) off-balance-sheet credit exposures	(128)		28
Balance at end of period	$	3,559	$	2,412

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, 2023		December 31, 2022
Commitments to extend credit	$	1,274,326	$	1,296,773
Standby letters of credit	25,959		26,844
Total	$	1,300,285	$	1,323,617

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 both the three months ended March 31, 2023, there were $192,000 operating lease ROU assets obtained in exchange for new operating lease liabilities. During the three months ended March 31, 2022, there were no operating lease ROU assets obtained in exchange for new operating lease liabilities.

Securities. In the normal course of business we buy and sell securities. At March 31, 2023, there were no unsettled trades to purchase securities and $4.0 million unsettled trades to sell securities. At December 31, 2022, 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, 2023 or December 31, 2022.

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 2022 Form 10-K. Certain risks, uncertainties and other factors, including those set forth under "Risk Factors" in Part I, Item 1A. of the 2022 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, capital, liquidity, our ability to sell nonperforming assets, expense reductions, planned operational efficiencies and earnings from growth and certain market risk disclosures, including the impact of interest rates, tax reform, inflation, the impacts related to or resulting from other economic factors are based upon information presently available to management and are dependent on choices about key model characteristics and assumptions and are subject to various limitations.  By their nature, certain of the market risk disclosures are only estimates and could be materially different from what actually occurs in the future.  Accordingly, our results could materially differ from those that have been estimated.  The most significant factor that could cause future results to differ materially from those anticipated by our forward-looking statements include the ongoing impact of higher inflation levels, higher interest rates and general economic and recessionary concerns, all of which could impact economic growth and could cause a reduction in financial transactions and business activities, including decreased deposits and reduced loan originations, our ability to manage liquidity in a rapidly changing and unpredictable market, supply chain disruptions, labor shortages and additional interest rate increases by the Federal Reserve. Other factors that could cause actual results to differ materially from those indicated by forward-looking statements include, but are not limited to, the following:

•general (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, as well as the risk of an economic slowdown or recession;

•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 to increase interest rates, the capital requirements promulgated by the Basel Committee, the CARES Act, the Economic Aid Act, the discontinuation of interest rates based on LIBOR and other regulatory responses to economic conditions;

•economic or other disruptions caused by acts of terrorism, war or other conflicts, including the Russia-Ukraine conflict, natural disasters, such as hurricanes, freezes, flooding and other man-made disasters, such as oil spills or power outages, health emergencies, epidemics or pandemics, climate changes or other catastrophic events;

•potential impacts of the recent adverse developments in the banking industry highlighted by high-profile bank failures, including impacts on customer confidence, deposit outflows, liquidity and the regulatory response thereto;

•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;

•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;

•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;

•the effect of compliance with legislation or regulatory changes;

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

•increases in our nonperforming assets;

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

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

•our ability to monitor interest rate risk;

•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;

•potential claims, damages, penalties, fines and reputational damage resulting from pending or future litigation, regulatory proceedings and enforcement actions;

•changes impacting our balance sheet and leverage strategy;

•risks related to actual mortgage prepayments diverging from projections;

•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 rising inflation and recessionary concerns;

•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 changes in accounting policies and practices;

•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;

•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;

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

•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 2022 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 and off-balance-sheet credit exposure.

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 “Part II – Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Estimates,,” “Part II – Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations – Allowance for Credit Losses – Loans and Allowance for Credit Losses – Off-Balance-Sheet Credit Exposures,” “Note 1 – Summary of Significant Accounting and Reporting Policies,” “Note 5 – Loans and Allowance for Loan Losses” and “Note 17 – Off-Balance-Sheet Arrangements, Commitments and Contingencies” in the 2022 Form 10-K. As of March 31, 2023, 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% 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 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,
	2023			2022
Net interest income (GAAP)	$	53,353		$	48,906
Tax equivalent adjustments:
Loans	697			745
Tax-exempt investment securities	2,550			2,464
Net interest income (FTE) (1)	$	56,600		$	52,115
Average earning assets	$	7,161,836		$	6,553,710
Net interest margin	3.02		%	3.03		%
Net interest margin (FTE) (1)	3.21		%	3.22		%
Net interest spread	2.44		%	2.89		%
Net interest spread (FTE) (1)	2.62		%	3.09		%

(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

ECONOMIC CONDITIONS

The economic conditions and growth prospects for our markets, even against the headwinds of inflation and recessionary concerns, continue to reflect a solid and positive overall outlook. Increasing interest rates and high building costs, however, have caused a slowdown in what was a robust single family housing market. Worker shortages, supply chain disruptions, higher interest rates and inflationary conditions, have had some impact on the level of economic growth in our market areas. Ongoing higher inflation and interest rates could have a negative impact on both our consumer and commercial borrowers. Despite these conditions, overall, Texas continues to experience economic growth due to company relocations and expansions, combined with overall population growth.

DEPOSITS

Deposits at March 31, 2023 were $5.84 billion, a decrease of $232.2 million, or 3.8%, compared to $6.07 billion at March 31, 2022. Linked quarter, deposits decreased $359.8 million, or 5.8%, from $6.20 billion at December 31, 2022. During the three months ended March 31, 2023, brokered deposits decreased $191.8 million, or 29.1%, compared to December 31, 2022, and decreased $208.1 million, or 30.8%, compared to March 31, 2022, as the funding of our cash flow hedge swaps partially transitioned from brokered deposits to Federal Home Loan Bank advances and other borrowings to obtain lower cost funding.

At March 31, 2023, we had 180,516 total deposit accounts with an average balance of $30,000. At March 31, 2023, our deposit accounts consisted of the following (dollars in thousands):

	March 31, 2023
	Balance		Number of Accounts	Average  Balance		% of Total Deposits
Individual non-maturity	$	2,328,776	150,070	$	16	39.9	%
Commercial non-maturity	1,646,832		21,027	78		28.2	%
Certificates of deposits	496,672		8,707	57		8.5	%
Public funds	898,467		712	1,262		15.4	%
Total deposits, excluding brokered deposits	5,370,747		180,516	$	30	92.0	%
Brokered deposits	467,473		—	—		8.0	%
Total deposits	$	5,838,220				100.0	%

At March 31, 2023, our estimated uninsured deposits, excluding affiliate deposits (Southside-owned deposits) and public funds (all collateralized), was 26.5%. At March 31, 2023, estimated uninsured deposits consisted of the following (dollars in thousands):

	March 31, 2023
	Balance		Uninsured  Balance		% of Uninsured Total Deposits
Affiliate deposits	$	21,807	$	21,470	0.4	%
Customer deposits	4,450,473		1,545,304		26.5	%
Brokered deposits	467,473		—		—
Public funds	898,467		870,076		14.9	%
Total	$	5,838,220	2,436,850		41.7	%
Excluding public funds (collateralized)			(870,076)		(14.9)	%
Excluding affiliate deposits			(21,470)		(0.4)	%
Total estimated uninsured deposits			$	1,545,304	26.5	%

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We continued to increase interest rates paid on deposits during the quarter in order to retain deposits. Our noninterest bearing deposits represent 26.4% of total deposits. Linked quarter, our cost of interest bearing deposits increased 60 basis points from 1.22% in the prior quarter to 1.82%. Our cost of total deposits for the first quarter of 2023 increased 46 basis points from 0.88% in the prior quarter to 1.34%.

Our cost of interest bearing deposits increased 152 basis points, from 0.30% for the three months ended March 31, 2022, to 1.82% for the three months ended March 31, 2023. Our cost of total deposits increased 112 basis points, from 0.22% at March 31, 2022 to 1.34% at March 31, 2023.

CAPITAL RESOURCES AND LIQUIDITY

Our capital ratios and contingent liquidity sources remain solid. We utilized the Federal Reserve’s Bank Term Funding Program to reduce our overall funding costs and to enhance our interest rate risk position. As of March 31, 2023, our BTFP borrowings of $198.4 million were at a cost of 4.37%.

The table below shows our total lines of credit, current borrowings as of March 31, 2023, total amounts available for future borrowings, and swapped value (in thousands):

	March 31, 2023
	Line of Credit		Borrowings		Total Available for Future Liquidity		Swapped
FHLB advances	$	1,866,515	$	333,183	$	1,533,332	$	180,000
Federal Reserve discount window	632,832		350,000		282,832		350,000
Correspondent bank lines of credit	62,500		—		62,500		—
Federal Reserve Bank Term Funding Program	201,539		198,416		3,123		—
Total liquidity lines	$	2,763,386	$	881,599	$	1,881,787	$	530,000

Operating Results

Net income increased $1.0 million, or 4.2%, for the three months ended March 31, 2023, to $26.0 million compared to the same period in 2022. The increase in net income was primarily a result of a $4.4 million increase in net interest income, a $1.3 million increase in noninterest income, partially offset by the $3.7 million increase in noninterest expense and the $1.4 million increase in income tax expense. Earnings per diluted common share increased $0.06, or 7.8%, to $0.83 for the three months ended March 31, 2023, compared to $0.77 for the three months ended March 31, 2022.

Financial Condition

Our total assets increased $233.7 million, or 3.1%, to $7.79 billion at March 31, 2023 from $7.56 billion at December 31, 2022. Our securities portfolio increased by $119.9 million, or 4.6%, to $2.75 billion, compared to $2.63 billion at December 31, 2022. The increase in the securities portfolio was due to purchases of three-month U.S. Treasury Bills, partially offset by a decrease in MBS and municipal bonds during the three months ended March 31, 2023. Our FHLB stock increased $7.5 million, or 81.7%, to $16.7 million from $9.2 million at December 31, 2022, due to the increase in our FHLB borrowings during the three months ended March 31, 2023, increasing the amount of FHLB stock we are required to hold.

Loans at March 31, 2023 were $4.15 billion, an increase of $5.0 million, or 0.1%, compared December 31, 2022, due to increases of $32.2 million in construction loans, $9.1 million in 1-4 family residential loans and $3.2 million in commercial real estate loans. The increases were partially offset by decreases of $23.9 million in commercial loans, $11.5 million in municipal loans and $4.1 million in loans to individuals. Loans held for sale decreased $260,000, or 39.0%, to $407,000 at March 31, 2023 from $667,000 at December 31, 2022.

Our nonperforming assets at March 31, 2023 decreased $7.7 million, or 70.7%, to $3.2 million and represented 0.04% of total assets, compared to $10.9 million, or 0.14% of total assets, at December 31, 2022.  Nonaccruing loans increased $323,000, or 11.3%, to $3.2 million, and the ratio of nonaccruing loans to total loans was 0.08% and 0.07% for March 31, 2023 and December 31, 2022, respectively. There were no restructured loans at March 31, 2023 compared to $7.8 million at December 31, 2022. The decrease in restructured loans was primarily due to the adoption of ASU 2022-22 on January 1, 2023, which allowed for the prospective exclusion of loan modifications that are performing, but would have previously required disclosure as troubled debt restructures in nonperforming assets. There was $11,000 and $74,000 of repossessed assets at

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March 31, 2023 and December 31, 2022, respectively. There was no OREO at March 31, 2023 and $93,000 at December 31, 2022.

Our deposits decreased $359.8 million, or 5.8%, to $5.84 billion at March 31, 2023 from $6.20 billion at December 31, 2022, including a decrease in our brokered deposits of $191.8 million, or 29.1%, as the funding of our cash flow hedge swaps partially transitioned from brokered deposits to FHLB advances and other borrowings to obtain lower cost funding.

Total FHLB borrowings increased $179.8 million, or 117.3%, to $333.2 million at March 31, 2023 from $153.4 million at December 31, 2022.

Our total shareholders’ equity at March 31, 2023 increased 0.7%, or $5.0 million, to $751.0 million, or 9.6% of total assets, compared to $746.0 million, or 9.9% of total assets, at December 31, 2022. The increase in shareholders’ equity was the result of net income of $26.0 million, other comprehensive income of $4.1 million, stock compensation expense of $914,000, net issuance of common stock under employee stock plans of $572,000 and common stock issued under our dividend reinvestment plan of $302,000. These increases were partially offset by decreases in shareholders’ equity, including the repurchase of $15.9 million of our common stock and cash dividends paid of $11.0 million.

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

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Balance Sheet Strategy

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. Changing interest rate environments and economic conditions require that we monitor the interest rate sensitivity of the assets, the funding driving our growth and closely align ALCO objectives accordingly.

As a result of recent events in the banking industry, we increased our cash balance at the Federal Reserve for potential liquidity needs and utilized the BTFP as a source of wholesale funding to reduce interest cost and interest rate risk. We also pledged additional securities to the FRDW increasing our credit line in preparation of potential liquidity needs. We ended the first quarter with approximately $286 million in available liquidity between the FRDW and the BTFP in addition to the approximately $1.53 billion credit line available from FHLB due primarily to the blanket lien on our loan portfolio and to a lesser extent, securities available as collateral. At March 31, 2023, the estimated uninsured deposits to total deposits, excluding affiliate deposits (Southside-owned deposits) and public funds (fully collateralized), was 26.5%, or $1.5 billion.

During the first quarter of 2023, we entered into $350 million of additional cash flow hedge swaps funded by FRDW borrowings. We also replaced $30 million of brokered deposits with FHLB advances as the funding source for cash flow hedge swaps, bringing this funding source to $180 million. At March 31, 2023, brokered deposits funded $350 million of our cash flow hedge swaps, which totaled $880 million. As of March 31, 2023, a pre-tax unrealized gain of $27.4 million was recognized in other comprehensive income, and there was no ineffective portion of these hedges. We continue to evaluate the lowest cost alternative funding sources for our cash flow swaps and will use either brokered deposits, FHLB advances or FRDW borrowings, or a combination of the three funding sources. During 2020 and 2021, management utilized the significant increase in non-maturity deposits, net of brokered deposits, to reduce dependence on more interest rate sensitive and higher cost wholesale funding. At March 31, 2023, the majority of the securities portfolio was funded by non-maturity deposits with wholesale funding accounting for approximately 49% of the funding source, of which approximately 65% is swapped at a fixed rate, providing protection from rising interest rates.

We utilize wholesale funding and securities to enhance overall profitability to determine the appropriate leverage of our capital, determining acceptable levels of credit, interest rate and liquidity risk consistent with prudent capital management.  This balance sheet strategy currently consists of borrowing funds from the brokered market, FHLB and the Federal Reserve through the FRDW and BTFP.  These funds are invested primarily in U.S. agency MBS and long-term municipal securities and to a lesser extent, corporate securities.  Although U.S. agency MBS often carry lower yields than 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.  

Risks associated with this asset structure include a potentially lower net interest rate spread and margin when compared to our peers, changes in the slope of the yield curve, increased interest rate risk, the length of interest rate cycles, changes in volatility or spreads associated with the MBS, municipal and corporate securities, the unpredictable nature of MBS prepayments and credit risks associated with the municipal and corporate securities.  See “Part I - Item 1A.  Risk Factors – Risks Related to Our Business” in the 2022 Form 10-K for a discussion of risks related to interest rates.  An additional risk is significant increases in interest rates, especially long-term interest rates, which could adversely impact the fair value of the AFS securities portfolio and could also 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.

Our securities portfolio increased from $2.63 billion at December 31, 2022 to $2.75 billion at March 31, 2023. The increase in the securities portfolio was due to securities purchased during the three months ended March 31, 2023, which more than offset sales of securities and principal payments.

During the three months ended March 31, 2023, the composition of the securities portfolio continued to change as U.S. Treasury Bills increased while the remaining categories in the portfolio decreased. The decrease in MBS was attributable to sales of U.S. Agency MBS and principal payments, partially offset by MBS purchases. During the three months ended March 31, 2023, we purchased $296.4 million in three-month U.S. Treasury Bills, $59.5 million in MBS and $5.8 million in investment grade subordinated corporate debt. Sales during the three months ended March 31, 2023, included $143.9 million in MBS and $95.6 million in municipal securities to align the investment portfolio with the current balance sheet strategy. Sales of AFS securities for the three months ended March 31, 2023, resulted in a net realized loss of $2.1 million which was more than offset by the sale of equity securities that resulted in a net gain of $2.4 million.

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At March 31, 2023, securities as a percentage of assets totaled 35.2%, compared to 34.7% at December 31, 2022, due to a $119.9 million, or 4.6%, increase in the securities portfolio. Our balance sheet management strategy is dynamic and is continually evaluated as market conditions warrant. 

During the year ended 2022, we entered into partial term fair value hedges for certain of our fixed rate callable AFS municipal securities. The instruments are designated as fair value hedges as the changes in the fair value of the interest rate swap are expected to offset changes in the fair value of the hedged item attributable to changes in the SOFR swap rate, the designated benchmark interest rate. As of March 31, 2023, hedged securities with a carrying amount of $759.7 million are included in our AFS securities portfolio in our consolidated balance sheets representing approximately 52% and 85% of the AFS securities portfolio and the AFS municipal portfolio, respectively. These derivative contracts involve the receipt of floating rate interest from a counterparty in exchange for us making fixed-rate payments over the life of the agreement, without the exchange of the underlying notional value. As of March 31, 2023, a pre-tax unrealized gain of $9.8 million was recognized in other comprehensive income, and there was no ineffective portion of these hedges.

With respect to funding sources, we primarily utilize deposits and to a lesser extent wholesale funding 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 sources are brokered deposits, FHLB and borrowings from the Federal Reserve through the FRDW and BTFP. Our FHLB borrowings increased 117.3%, or $179.8 million, to $333.2 million at March 31, 2023 from $153.4 million at December 31, 2022.

For the three months ended March 31, 2023, our total wholesale funding as a percentage of deposits, not including brokered deposits, increased to 25.1%, from 18.1% at December 31, 2022, and 12.6% at March 31, 2022.

Our brokered deposits consist of CDs and non-maturity deposits. Our brokered CDs decreased $129.4 million, or 58.6%, from $220.9 million at December 31, 2022 to $91.5 million at March 31, 2023. At March 31, 2023, our brokered CDs had a weighted average cost of 426 basis points and remaining maturities of less than 4 months. Our brokered non-maturity deposits decreased to $376.0 million at March 31, 2023, of which $350.0 million are related to our cash flow hedges, from $438.4 million at December 31, 2022, with a weighted average cost of 151 basis points and 126 basis points, respectively. Our wholesale funding policy currently allows for maximum brokered deposits of $1.10 billion, with an additional $50 million of flexibility for deposits maturing within 30 days. Potential higher interest expense and lack of customer loyalty are risks associated with the use of brokered deposits.

In connection with $880.0 million of our wholesale funds, the Bank has entered into various variable rate agreements and fixed or variable rate short-term pay agreements with an interest rate tied to three-month LIBOR, one-month LIBOR or overnight SOFR. In connection with $880.0 million and $605.0 million of the agreements outstanding at March 31, 2023 and December 31, 2022, respectively, 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 2.20% with a remaining average weighted maturity of 3.0 years at March 31, 2023. Refer to “Note 11 – 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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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 following table presents net interest income for the periods presented (in thousands):

	Three Months Ended
	March 31,
	2023		2022
Interest income:
Loans	$	54,776	$	34,888
Taxable investment securities	5,712		4,608
Tax-exempt investment securities	13,916		10,219
MBS	4,329		4,017
FHLB stock and equity investments	245		113
Other interest earning assets	1,870		28
Total interest income	80,848		53,873
Interest expense:
Deposits	19,906		3,237
FHLB borrowings	3,141		366
Subordinated notes	999		998
Trust preferred subordinated debentures	1,031		356
Repurchase agreements	492		10
Other borrowings	1,926		—
Total interest expense	27,495		4,967
Net interest income	$	53,353	$	48,906

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 three months ended March 31, 2023, the Federal Reserve increased the target federal funds rate by 50 basis points to 500 basis points and has indicated it anticipates additional rate increases during the remainder of 2023. The increase in the federal funds rate has increased our net interest income. However, as the federal funds rate increases further and the yield curve remains inverted, it may be less beneficial to our net interest income.

Net interest income for the three months ended March 31, 2023 increased $4.4 million, or 9.1%, compared to the same period in 2022. The increase in net interest income for the three months ended March 31, 2023 was due to the increase in interest income, a result of the increase in the average yield as well as the average balance of interest earning assets, partially offset by an increase in interest expense on our interest bearing liabilities due to higher interest rates and to a lesser extent, an increase in the average balance of our interest bearing liabilities. Total interest income increased $27.0 million, or 50.1%, to $80.8 million for the three months ended March 31, 2023, compared to $53.9 million during the same period in 2022. Total interest expense increased $22.5 million, or 453.6%, to $27.5 million for the three months ended March 31, 2023, compared to $5.0 million for the same period in 2022. Our net interest margin and net interest margin (FTE), a non-GAAP measure, decreased to 3.02% and 3.21%, respectively, for the three months ended March 31, 2023, compared to 3.03% and 3.22%, respectively, for the same period in 2022, and our net interest spread and net interest spread (FTE), also a non-GAAP measure, decreased to 2.44% and 2.62%, respectively, compared to 2.89% and 3.09%, respectively, for the same period in 2022.

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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, 2023 Compared to 2022
	Change Attributable to				Total
Fully Taxable-Equivalent Basis:	Average Volume		Average Yield/Rate		Change
Interest income on:
Loans (1)	$	4,449	$	15,379	$	19,828
Loans held for sale	8		4		12
Taxable investment securities	346		758		1,104
Tax-exempt investment securities (1)	1,112		2,671		3,783
Mortgage-backed and related securities	(885)		1,197		312
FHLB stock, at cost, and equity investments	73		59		132
Interest earning deposits	45		964		1,009
Federal funds sold	197		636		833
Total earning assets	5,345		21,668		27,013
Interest expense on:
Savings accounts	6		1,034		1,040
CDs	324		4,489		4,813
Interest bearing demand accounts	(91)		10,907		10,816
FHLB borrowings	1,631		1,144		2,775
Subordinated notes, net of unamortized debt issuance costs	1		—		1
Trust preferred subordinated debentures, net of unamortized debt issuance costs	—		675		675
Repurchase agreements	57		425		482
Other borrowings	—		1,926		1,926
Total interest bearing liabilities	1,928		20,600		22,528
Net change	$	3,417	$	1,068	$	4,485

(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 increase in total interest income was primarily attributable to an increase in the average yield on interest earning assets to 4.76% from 3.53% for the same period in 2022, as well as an increase in the average balance of interest earning assets of $608.1 million, or 9.3%, for the three months ended March 31, 2023 compared to the same period in 2022. The increase in total interest expense for the three months ended March 31, 2023, was primarily attributable to the increase in interest rates on our interest bearing liabilities to 2.14% from 0.44% for the same period in 2022, and to a lesser extent, an increase in the average balance of our 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, 2023 and 2022. 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, 2023						March 31, 2022
	Average Balance		Interest		Average Yield/Rate		Average Balance		Interest		Average Yield/Rate
ASSETS
Loans (1)	$	4,128,775	$	55,453	5.45	%	$	3,703,980	$	35,625	3.90	%
Loans held for sale	1,662		20		4.88	%	928		8		3.50	%
Securities:
Taxable investment securities (2)	690,864		5,712		3.35	%	644,706		4,608		2.90	%
Tax-exempt investment securities (2)	1,692,700		16,466		3.95	%	1,563,185		12,683		3.29	%
Mortgage-backed and related securities (2)	455,811		4,329		3.85	%	566,941		4,017		2.87	%
Total securities	2,839,375		26,507		3.79	%	2,774,832		21,308		3.11	%
FHLB stock, at cost, and equity investments	31,470		245		3.16	%	20,677		113		2.22	%
Interest earning deposits	87,924		1,033		4.76	%	44,642		24		0.22	%
Federal funds sold	72,630		837		4.67	%	8,651		4		0.19	%
Total earning assets	7,161,836		84,095		4.76	%	6,553,710		57,082		3.53	%
Cash and due from banks	107,765						107,144
Accrued interest and other assets	398,709						607,235
Less:  Allowance for loan losses	(36,690)						(35,636)
Total assets	$	7,631,620					$	7,232,453
LIABILITIES AND SHAREHOLDERS’ EQUITY
Savings accounts	$	665,919	1,313		0.80	%	$	652,394	273		0.17	%
CDs	787,887		5,407		2.78	%	563,599		594		0.43	%
Interest bearing demand accounts	2,983,218		13,186		1.79	%	3,097,966		2,370		0.31	%
Total interest bearing deposits	4,437,024		19,906		1.82	%	4,313,959		3,237		0.30	%
FHLB borrowings	404,199		3,141		3.15	%	122,783		366		1.21	%
Subordinated notes, net of unamortized debt issuance costs	98,693		999		4.11	%	98,552		998		4.11	%
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,265		1,031		6.94	%	60,261		356		2.40	%
Repurchase agreements	65,435		492		3.05	%	21,494		10		0.19	%
Other borrowings	136,700		1,926		5.71	%	467		—		—
Total interest bearing liabilities	5,202,316		27,495		2.14	%	4,617,516		4,967		0.44	%
Noninterest bearing deposits	1,588,725						1,642,973
Accrued expenses and other liabilities	81,829						84,009
Total liabilities	6,872,870						6,344,498
Shareholders’ equity	758,750						887,955
Total liabilities and shareholders’ equity	$	7,631,620					$	7,232,453
Net interest income (FTE)			$	56,600					$	52,115
Net interest margin (FTE)					3.21	%					3.22	%
Net interest spread (FTE)					2.62	%					3.09	%

(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, 2023 and 2022, loans totaling $3.2 million and $2.4 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,				2023
					Change From
	2023		2022		2022
Deposit services	$	6,422	$	6,628	$	(206)	(3.1)	%
Net gain (loss) on sale of securities AFS	(2,146)		(1,543)		(603)		(39.1)	%
Net gain on sale of equity securities	2,416		—		2,416		100.0	%
Gain on sale of loans	104		178		(74)		(41.6)	%
Trust fees	1,467		1,494		(27)		(1.8)	%
BOLI	1,675		691		984		142.4	%
Brokerage services	697		809		(112)		(13.8)	%
Other noninterest income	1,398		2,468		(1,070)		(43.4)	%
Total noninterest income	$	12,033	$	10,725	$	1,308	12.2	%

The 12.2% increase in noninterest income for the three months ended March 31, 2023, when compared to the same period in 2022, was due to a net gain on sale of equity securities and an increase in BOLI income, partially offset by a decrease in other noninterest income and an increase in net loss on sale of securities AFS.

The decrease in deposit services income for the three months ended March 31, 2023, when compared to the same period in 2022, was primarily due to a decrease in overdraft fees.

During the three months ended March 31, 2023, we sold MBS and municipal securities that resulted in a net loss on sale of AFS securities of $2.1 million.

During the three months ended March 31, 2023, we sold equity securities that resulted in a net gain of $2.4 million.

Gain on sale of loans decreased for the three months ended March 31, 2023, when compared to the same period in 2022, due to a decrease in the volume of loans sold and a decrease in margins on loan sales as interest rates continued to increase in 2023.

The increase in BOLI income for the three months ended March 31, 2023, when compared to the same period in 2022, was primarily due to a death benefit of $951,000 realized in the first quarter of 2023 for a former covered officer.

Brokerage services income decreased for the three months ended March 31, 2023, when compared to the same period in 2022, due to a decrease in assets under management due to the downturn in the market.

Other noninterest income decreased for the three months ended March 31, 2023, when compared to the same period in 2022, primarily due to a decrease in investment income and mortgage servicing income, partially offset by an increase in equity 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,				2023
					Change From
	2023		2022		2022
Salaries and employee benefits	$	21,856	$	19,969	$	1,887	9.4	%
Net occupancy	3,734		3,656		78		2.1	%
Advertising, travel & entertainment	1,050		737		313		42.5	%
ATM expense	355		281		74		26.3	%
Professional fees	1,372		927		445		48.0	%
Software and data processing	2,055		1,631		424		26.0	%
Communications	327		503		(176)		(35.0)	%
FDIC insurance	544		472		72		15.3	%
Amortization of intangibles	478		622		(144)		(23.2)	%
Other noninterest expense	3,078		2,397		681		28.4	%
Total noninterest expense	$	34,849	$	31,195	$	3,654	11.7	%

The primary increase in noninterest expense for the three months ended March 31, 2023, when compared to the same period in 2022, was in salaries and employee benefits. Several additional expense categories increased during the three months ended March 31, 2023, including other noninterest expense, professional fees, software and data processing expense and advertising, travel and entertainment expense.

Salaries and employee benefits increased for the three months ended March 31, 2023, when compared to the same period in 2022, due to an increase in direct salary expense and health insurance expense, partially offset by a decrease in retirement expense.

For the three months ended March 31, 2023, direct salary expense increased $1.5 million, or 8.7%, when compared to the same period in 2022, primarily due to normal salary increases effective in the first quarter of 2023 and market increases in the second quarter of 2022.

Health and life insurance expense, included in salaries and employee benefits, increased $383,000, or 22.1%, for the three months ended March 31, 2023, when compared to the same period in 2022. We have a self-insured health plan which is supplemented with a stop loss insurance policy.

Retirement expense, included in salaries and employee benefits, decreased $20,000, or 2.8%, for the three months ended March 31, 2023, when compared to the same period in 2022. This decrease was primarily due to a decrease in our deferred compensation expense.

Advertising, travel and entertainment expense increased for the three months ended March 31, 2023, when compared to the same period in 2022, primarily due to increases in media advertising, travel related expenses and conference registrations fees.

ATM expense increased for the three months ended March 31, 2023, when compared to the same period in 2022, due primarily to an increase in maintenance expense related to new ITM machines placed into service.

Professional fees increased for the three months ended March 31, 2023, when compared to the same period in 2022, due to an increase in consulting and legal fees.

Software and data processing expense increased for the three months ended March 31, 2023, when compared to the same period in 2022, due to new software contracts and increases in existing contract renewal costs.

Communications expense decreased for the three months ended March 31, 2023, when compared to the same period in 2022, driven by a decrease in phone and internet costs due to a change in vendors.

FDIC insurance increased for the three months ended March 31, 2023, when compared to the same period in 2022, due to an increase in our assessment base resulting from an increase in our total assets.

Amortization of intangibles decreased for the three months ended March 31, 2023, when compared to the same period in 2022, due primarily to a decrease in core deposit intangible amortization which is recognized on an accelerated method resulting in a decline in expense over the amortization period.

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Other noninterest expense increased for the three months ended March 31, 2023, when compared to the same period in 2022, primarily due to increases in non-service cost retirement expense related to the Retirement Plan and the Restoration Plan.

Income Taxes

Pre-tax income for the three months ended March 31, 2023 was $30.6 million, an increase of 8.7% compared to $28.1 million for the same period in 2022. We recorded income tax expense of $4.5 million for the three months ended March 31, 2023, compared to income tax expense of $3.1 million for the same period in 2022. The ETR as a percentage of pre-tax income was 14.9% for the three months ended March 31, 2023, compared to an ETR as a percentage of pre-tax income of 11.2% for the same period in 2022. The increase in the income tax expense for the three months ended March 31, 2023 was a result of a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same periods in 2022.

The ETR differs from the statutory rate of 21% primarily due to the effect of tax-exempt income from municipal loans and securities, as well as BOLI. The net deferred tax asset totaled $33.8 million at March 31, 2023 as compared to $34.7 million at December 31, 2022. The decrease in the net deferred tax asset is primarily the result of a decrease in unrealized losses 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, 2023 or December 31, 2022, 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 2022 Form 10-K for a discussion of our primary market area and the geographic concentration of our loan portfolio as of December 31, 2022.  There were no substantial changes in these concentrations during the three months ended March 31, 2023.  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, 2022		March 31, 2022
	March 31, 2023		December 31, 2022		March 31, 2022		Change (%)		Change (%)
Real estate loans:
Construction	$	591,894	$	559,681	$	490,166	5.8	%	20.8	%
1-4 family residential	672,595		663,519		647,837		1.4	%	3.8	%
Commercial	1,990,861		1,987,707		1,722,577		0.2	%	15.6	%
Commercial loans	388,182		412,064		401,144		(5.8)	%	(3.2)	%
Municipal loans	438,566		450,067		455,155		(2.6)	%	(3.6)	%
Loans to individuals	70,546		74,653		84,037		(5.5)	%	(16.1)	%
Total loans	$	4,152,644	$	4,147,691	$	3,800,916	0.1	%	9.3	%

Our total loan portfolio increased $5.0 million, or 0.1%, at March 31, 2023 compared to December 31, 2022, with increases in construction loans, 1-4 family residential loans and commercial real estate loans, partially offset by decreases in commercial loans, municipal loans and loans to individuals.

Total loans increased $351.7 million, or 9.3%, compared to March 31, 2022, with increases in commercial real estate loans, construction loans and 1-4 family residential loans, partially offset by decreases in municipal loans, loans to individuals and commercial loans.

At March 31, 2023, our real estate loans represented 78.4% of our loan portfolio and were comprised of commercial real estate loans of 61.1%, 1-4 family residential loans of 20.7% and construction loans of 18.2%. 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.

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 restructured loans.  Nonaccrual loans are loans 90 days or more delinquent and collection in full of both the principal and interest is not expected.  Additionally, some loans that are not delinquent 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

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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 modified due to the borrower experiencing financial difficulty to provide 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.

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

							Compared to
							December 31, 2022		March 31, 2022
	March 31, 2023		December 31, 2022		March 31, 2022		Change (%)		Change (%)
Nonaccrual loans	$	3,169	$	2,846	$	2,357	11.3	%	34.5	%
Accruing loans past due more than 90 days	—		—		—		—		—
Restructured loans (1)	—		7,849		9,098		(100.0)	%	(100.0)	%
OREO	—		93		—		(100.0)	%	—
Repossessed assets	11		74		—		(85.1)	%	100.0	%
Total nonperforming assets	$	3,180	$	10,862	$	11,455	(70.7)	%	(72.2)	%
Total loans	$	4,152,644	$	4,147,691	$	3,800,916
Allowance for loan losses at end of period	36,332		36,515		35,524

Ratio of nonaccruing loans to:
Total loans	0.08	%	0.07	%	0.06	%
Ratio of nonperforming assets to:
Total assets	0.04	%	0.14	%	0.16	%
Total loans	0.08	%	0.26	%	0.30	%
Total loans and OREO	0.08	%	0.26	%	0.30	%
Ratio of allowance for loan losses to:
Nonaccruing loans	1,146.48	%	1,283.03	%	1,507.17	%
Nonperforming assets	1,142.52	%	336.17	%	310.12	%
Total loans	0.87	%	0.88	%	0.93	%
Net charge-offs to average loans outstanding	0.03	%	0.02	%	—

(1) Pursuant to our adoption of ASU 2022-02, effective January 1, 2023, we prospectively discontinued the recognition and measurement guidance previously required on troubled debt restructures. As a result, “restructured” loans as of March 31, 2023 exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures.

We actively market all OREO properties and do not hold them for investment purposes.

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 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 the economic inputs to their long-run historical trends. 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

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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 continued economic uncertainty related to inflation and recessionary concerns, as based on known and knowable information as of March 31, 2023.

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 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, 2023, our review of the loan portfolio indicated that an allowance for loan losses of $36.3 million was appropriate to cover expected losses in the portfolio.  Changes in economic and other conditions, including the application of the CECL model, rising interest rates and heightened inflation, may require future adjustments to the allowance for loan losses.

During the three months ended March 31, 2023, the allowance for loan losses decreased $183,000, or 0.5%, to $36.3 million, or 0.87% of total loans, when compared to $36.5 million, or 0.88% of total loans at December 31, 2022.

For the three months ended March 31, 2023, loan charge-offs were $633,000, and recoveries were $362,000. For the three months ended March 31, 2022, loan charge-offs were $555,000, and recoveries were $540,000. We recorded a provision for credit losses for loans of $88,000 and $266,000 for the three months ended March 31, 2023 and 2022, respectively.

Allowance for Credit Losses - Off-Balance-Sheet Credit Exposures

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

	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	3,687	$	2,384
Provision for (reversal of) off-balance-sheet credit exposures	(128)		28
Balance at end of period	$	3,559	$	2,412

Our off-balance-sheet credit exposures include contractual commitments to extend credit and standby letters of credit. For these credit exposures we evaluate the expected credit losses using usage given defaults and credit conversion factors depending on the type of commitment and based upon historical usage rates. These assumptions are reevaluated on an annual basis and adjusted if necessary. For additional information regarding our methodology used to estimate the allowance for credit losses on off-balance-sheet credit exposures, see “Note 12 - Off-Balance-Sheet Arrangements, Commitments and Contingencies” to our consolidated financial statements included in this report.

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Capital Resources and Liquidity

Our total shareholders’ equity at March 31, 2023 increased 0.7%, or $5.0 million, to $751.0 million, or 9.6% of total assets, compared to $746.0 million, or 9.9% of total assets, at December 31, 2022. The increase in shareholders’ equity was the result of net income of $26.0 million, other comprehensive income of $4.1 million, stock compensation expense of $914,000, net issuance of common stock under employee stock plans of $572,000 and common stock issued under our dividend reinvestment plan of $302,000. These increases were partially offset by decreases in shareholders’ equity, including the repurchase of $15.9 million of our common stock and cash dividends paid of $11.0 million.  

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, 2023 included $58.5 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, 2023.

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 $98.7 million of qualified subordinated debt as of March 31, 2023. 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. In accordance with CECL guidance, a CECL transitional amount totaling $4.1 million has been added back to CET1 as of March 31, 2023, representing 50% of the $8.2 million transitional amount at December 31, 2022.

Management believes that, as of March 31, 2023, 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.

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

	Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Actions Provisions
March 31, 2023	Amount		Ratio		Amount		Ratio		Amount		Amount
Common Equity Tier 1 (to Risk-Weighted Assets)
Consolidated	$	686,939	12.73	%	$	242,870	4.50	%	N/A		N/A
Bank Only	$	825,764	15.30	%	$	242,853	4.50	%	$	350,787	6.50	%
Tier 1 Capital (to Risk-Weighted Assets)
Consolidated	$	745,394	13.81	%	$	323,827	6.00	%	N/A		N/A
Bank Only	$	825,764	15.30	%	$	323,804	6.00	%	$	431,738	8.00	%
Total Capital (to Risk-Weighted Assets)
Consolidated	$	878,843	16.28	%	$	431,769	8.00	%	N/A		N/A
Bank Only	$	860,503	15.94	%	$	431,738	8.00	%	$	539,673	10.00	%
Tier 1 Capital (to Average Assets) (1)
Consolidated	$	745,394	9.83	%	$	303,439	4.00	%	N/A		N/A
Bank Only	$	825,764	10.89	%	$	303,343	4.00	%	$	379,178	5.00	%

	Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Actions Provisions
December 31, 2022	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common Equity Tier 1 (to Risk-Weighted Assets)
Consolidated	$	687,686	12.63	%	$	245,107	4.50	%	N/A		N/A
Bank Only	$	823,323	15.12	%	$	245,085	4.50	%	$	354,012	6.50	%
Tier 1 Capital (to Risk-Weighted Assets)
Consolidated	$	746,140	13.70	%	$	326,809	6.00	%	N/A		N/A
Bank Only	$	823,323	15.12	%	$	326,780	6.00	%	$	435,707	8.00	%
Total Capital (to Risk-Weighted Assets)
Consolidated	$	877,281	16.11	%	$	435,746	8.00	%	N/A		N/A
Bank Only	$	855,790	15.71	%	$	435,707	8.00	%	$	544,633	10.00	%
Tier 1 Capital (to Average Assets) (1)
Consolidated	$	746,140	9.96	%	$	299,511	4.00	%	N/A		N/A
Bank Only	$	823,323	11.00	%	$	299,410	4.00	%	$	374,263	5.00	%

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

As of March 31, 2023, 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 2022 Form 10-K for further discussion of our capital requirements.

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

	Three Months Ended March 31,
	2023		2022
Return on average assets	1.38	%	1.40	%
Return on average shareholders’ equity	13.92	%	11.42	%
Dividend payout ratio – Basic	42.17	%	44.16	%
Dividend payout ratio – Diluted	42.17	%	44.16	%
Average shareholders’ equity to average total assets	9.94	%	12.28	%

Management of Liquidity

Liquidity management involves our ability to convert assets to cash with minimum risk of loss while enabling us to meet our current and future 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, 2023, these investments were 7.5% of total assets, as compared with 2.4% for December 31, 2022 and 4.4% for March 31, 2022. The increase to 7.5% at March 31, 2023 as compared to December 31, 2022 and March 31, 2022, is reflective of increases in the short-term investment portfolio and interest earning deposits, partially offset by the increase 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, 2023 or December 31, 2022.  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, 2023, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities, was approximately $282.8 million. There were $350.0 million and $188.0 million in borrowings from the FRDW at March 31, 2023 and December 31, 2022, respectively. To provide more stability and to assure banks have the ability to meet the needs of all their depositors, the Federal Reserve created the BTFP in the first quarter of 2023. At March 31, 2023, the amount of additional funding the Bank could obtain from the BTFP, collateralized by securities, was approximately $3.1 million. There were $198.4 million in borrowings from the BTFP at March 31, 2023. At March 31, 2023, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by securities, FHLB stock and nonspecified loans and securities, was approximately $1.53 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, 2023, the line had one outstanding letter of credit for $155,000. The Bank currently has no outstanding letters of credit from FHLB held as collateral for its public fund deposits.

Interest rate sensitivity management seeks to avoid fluctuating net interest margins and to enhance consistent growth of net interest income through periods of changing interest rates.  The ALCO closely monitors various liquidity ratios and interest rate spreads and margins.  The ALCO utilizes a simulation model to perform interest rate simulation tests that apply various interest rate scenarios including immediate shocks and 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.

Management continually evaluates our liquidity position and currently believes the Company has adequate funding to meet our financial needs.

Branch Closure

On January 6, 2023, we closed one traditional branch location in Lufkin due to its close proximity to another Southside branch and a shift in customer preferences and their transition from in-branch banking to digital banking.

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, 2023 thru April 25, 2023, we purchased 197,345 shares of common stock at an average price of $32.99 pursuant to the Stock Repurchase Plan.

Southside Bancshares, Inc. |58

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 2022 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 regularly reviews our asset/liability position.  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, 100 and 200 basis points over the next 12 months.  These simulations incorporate assumptions regarding balance sheet growth and mix, pricing and the repricing and maturity characteristics of the existing and projected balance sheet.  The impact of interest rate-related risks such as prepayment, basis and option risk are also considered.  The model has interest rate floors and no interest rates are assumed to go negative. The interest rate environment in 2020 and much of 2021 was at a point where most treasury terms were under 100 basis points; therefore, we did not believe an analysis of an assumed decrease in interest rates beyond 50 basis points would provide meaningful results. We have resumed the simulation of rates decreasing 100 and 200 basis points as a result of the Federal Reserve’s ongoing interest rate increases in 2022 and 2023. We are continuing to monitor interest rates and anticipate additional rate increases during the remainder of 2023.

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:	2023		2022
Increase:
100 basis points	5.44	%	2.50	%
200 basis points	10.50	%	5.29	%
Decrease:
50 basis points	(3.17)	%	(2.45)	%
100 basis points	(6.68)	%	N/A
200 basis points	(13.65)	%	N/A

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.

Economic conditions and growth prospects are currently impacted by record inflation and recessionary concerns. Increasing interest rates and high building costs have caused a slowdown in the single family housing market. Furthermore, worker shortages, supply chain disruptions and inflationary conditions, have had some impact on the level of economic growth in our

Southside Bancshares, Inc. |59

market areas. Ongoing higher inflation levels and higher interest rates could have a negative impact on the financial condition of both our consumer and commercial borrowers.

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.

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, 2023 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

The following represents a material change in our risk factors from those disclosed in Part I – “Item 1A. Risk Factors” in the 2022 Form 10-K.

Recent negative developments in the banking industry could adversely affect our current and projected business operations and our financial condition and results of operations.

The recent bank failures and related negative media attention have generated significant market trading volatility among publicly traded bank holding companies and, in particular, regional, as well as community banks like the Company. These developments have negatively impacted customer confidence in regional and community banks, which could prompt customers to maintain their deposits with larger financial institutions. Further, competition for deposits has increased in recent periods, and the cost of funding has similarly increased, putting pressure on our net interest margin. If we were required to sell a portion of our securities portfolio to address liquidity needs, we may incur losses, including as a result of the negative impact of rising interest rates on the value of our securities portfolio, which could negatively affect our earnings and our capital. If we were required to raise additional capital in the current environment, any such capital raise may be on unfavorable terms, thereby negatively impacting book value and profitability. While we have taken actions to improve our funding, there is no guarantee that such actions will be successful or sufficient in the event of sudden liquidity needs.

Southside Bancshares, Inc. |60

We also anticipate increased regulatory scrutiny – in the course of routine examinations and otherwise – and new regulations directed towards banks of similar size to the Bank, designed to address the recent negative developments in the banking industry, all of which may increase our costs of doing business and reduce our profitability. Among other things, there may be an increased focus by both regulators and investors on deposit composition, the level of uninsured deposits, losses embedded in the held-to-maturity portion of our securities portfolio, contingent liquidity, CRE composition and concentration, capital position and our general oversight and internal control structures regarding the foregoing. As a result, the Bank could face increased scrutiny or be viewed as higher risk by regulators and the investor community.

Rising interest rates have decreased the value of a portion of the Company’s securities portfolio, and the Company would realize losses if it were required to sell such securities to meet liquidity needs.

As a result of inflationary pressures and the resulting rapid increases in interest rates over the last year, the fair value of our securities classified as available for sale and held-to-maturity has declined. These securities make up a majority of the securities portfolio of the Company, resulting in unrealized losses embedded in other comprehensive income as a part of shareholders’ equity. If the Company were required to sell such securities to meet liquidity needs, including in the event of deposit outflows or slower deposit growth, it may incur losses, which could impair the Company’s capital, financial condition, and results of operations and require the Company to raise additional capital on unfavorable terms, thereby negatively impacting its profitability. While the Company has taken actions to maximize its funding sources, there is no guarantee that such actions will be successful or sufficient in the event of sudden liquidity needs. Furthermore, while the Federal Reserve Board has announced a Bank Term Funding Program available to eligible depository institutions secured by U.S. treasuries, agency debt and mortgage-backed securities, and other qualifying assets as collateral at par, to mitigate the risk of potential losses on the sale of such instruments, there is no guarantee that such programs will be effective in addressing liquidity needs as they arise.

Southside Bancshares, Inc. |61

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

Issuer Purchases of Equity Securities

On March 1, 2022, our board of directors approved a Stock Repurchase Plan, authorizing the repurchase, from time to time, of up to 1.0 million shares of the Company’s outstanding common stock. On December 13, 2022, the board of directors increased its authorization under the Company’s 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 or pursuant to any trading plan that might be adopted in accordance with Rule 10b5-1 of the Exchange Act, as amended. The Company has 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, 2023:

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, 2023 - January 31, 2023	173,670	$	36.08	173,670	902,555
February 1, 2023 - February 28, 2023	—	—		—	902,555
March 1, 2023 - March 31, 2023	283,724	34.16		283,724	618,831
Total	457,394	$	34.89	457,394

Subsequent to March 31, 2023, and through April 25, 2023, we purchased 197,345 shares of common stock at an average price of $32.99 pursuant to the Stock Repurchase Plan.

ITEM 3.    DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4.    MINE SAFETY DISCLOSURES

None.

ITEM 5.    OTHER INFORMATION

None.

Southside Bancshares, Inc. |62

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. |63

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 28, 2023	BY:	/s/ Lee R. Gibson
			Lee R. Gibson, CPA
			President and Chief Executive Officer
			(Principal Executive Officer)
DATE:	April 28, 2023	BY:	/s/ Julie N. Shamburger
			Julie N. Shamburger, CPA
			Chief Financial Officer
			(Principal Financial and Accounting Officer)

Southside Bancshares, Inc. |64

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 28, 2023	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 28, 2023	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, 2023 (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 28, 2023	By:	/s/ LEE R. GIBSON
			Lee R. Gibson, CPA
			President and Chief Executive Officer
Date:	April 28, 2023	By:	/s/ JULIE N. SHAMBURGER
			Julie N. Shamburger, CPA
			Chief Financial Officer

XML

Cover Page - shares	3 Months Ended
	Mar. 31, 2023	Apr. 25, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
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		30,924,812
Entity Central Index Key	0000705432
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)		Mar. 31, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks		$ 101,109,000	$ 106,143,000
Interest earning deposits		151,999,000	9,276,000
Federal funds sold		57,384,000	83,833,000
Total cash and cash equivalents		310,492,000	199,252,000
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		1,437,222,000	1,299,014,000
Securities HTM (estimated fair value of $1,172,574 and $1,149,156, respectively)		1,308,457,000	1,326,729,000
FHLB stock, at cost		16,696,000	9,190,000
Equity investments		9,909,000	11,181,000
Loans held for sale		407,000	667,000
Loans:
Loans		4,152,644,000	4,147,691,000
Less: Allowance for loan losses		(36,332,000)	(36,515,000)
Net loans		4,116,312,000	4,111,176,000
Premises and equipment, net		141,363,000	141,256,000
Operating lease ROU assets		15,183,000	15,314,000
Goodwill		201,116,000	201,116,000
Other intangible assets, net		4,144,000	4,622,000
Interest receivable		34,890,000	49,350,000
Deferred tax asset, net		33,787,000	34,695,000
Unsettled trades to sell securities		4,044,000	0
BOLI		134,635,000	133,911,000
Other assets		23,688,000	21,163,000
Total assets		7,792,345,000	7,558,636,000
Deposits:
Noninterest bearing		1,543,413,000	1,671,562,000
Interest bearing		4,294,807,000	4,526,457,000
Total deposits		5,838,220,000	6,198,019,000
Other borrowings		625,627,000	221,153,000
FHLB borrowings		333,183,000	153,358,000
Subordinated notes, net of unamortized debt issuance costs	[1]	98,710,000	98,674,000
Trust preferred subordinated debentures, net of unamortized debt issuance costs		60,266,000	60,265,000
Operating lease liabilities		16,989,000	17,070,000
Other liabilities		68,320,000	64,100,000
Total liabilities		7,041,315,000	6,812,639,000
Off-balance-sheet arrangements, commitments and contingencies (Note 12)
Shareholders’ equity:
Common stock:  ($1.25 par value, 80,000,000 shares authorized, 38,008,848 shares issued at March 31, 2023 and 38,000,822 shares issued at December 31, 2022)		47,511,000	47,501,000
Paid-in capital		786,119,000	784,545,000
Retained earnings		254,565,000	239,610,000
Treasury stock: (shares at cost, 6,887,667 at March 31, 2023 and 6,454,192 at December 31, 2022)		(203,853,000)	(188,203,000)
AOCI		(133,312,000)	(137,456,000)
Total shareholders’ equity		751,030,000	745,997,000
Total liabilities and shareholders’ equity		$ 7,792,345,000	$ 7,558,636,000

[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.

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Securities AFS, at estimated fair value	$ 1,499,135	$ 1,387,874
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held-to-maturity, fair value	$ 1,172,574	$ 1,149,156
Shareholders' equity:
Common Stock, Par Value	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	80,000,000	80,000,000
Common stock, shares issued (in shares)	38,008,848	38,000,822
Treasury Stock, Shares	6,887,667	6,454,192

XML

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income:
Loans	$ 54,776	$ 34,888
Taxable investment securities	5,712	4,608
Tax-exempt investment securities	13,916	10,219
MBS	4,329	4,017
FHLB stock and equity investments	245	113
Other interest earning assets	1,870	28
Total interest income	80,848	53,873
Interest expense:
Deposits	19,906	3,237
FHLB borrowings	3,141	366
Subordinated notes	999	998
Trust preferred subordinated debentures	1,031	356
Other borrowings	2,418	10
Total interest expense	27,495	4,967
Net interest income	53,353	48,906
Provision for (reversal of) credit losses	(40)	294
Net interest income after provision for credit losses	53,393	48,612
Noninterest income:
Deposit services	6,422	6,628
Net gain (loss) on sale of securities AFS	(2,146)	(1,543)
Net gain on sale of equity securities	2,416	0
Gain on sale of loans	104	178
Trust fees	1,467	1,494
BOLI	1,675	691
Brokerage services	697	809
Other	1,398	2,468
Total noninterest income	12,033	10,725
Noninterest expense:
Salaries and employee benefits	21,856	19,969
Net occupancy	3,734	3,656
Advertising, travel & entertainment	1,050	737
ATM expense	355	281
Professional fees	1,372	927
Software and data processing	2,055	1,631
Communications	327	503
FDIC insurance	544	472
Amortization of intangibles	478	622
Other	3,078	2,397
Total noninterest expense	34,849	31,195
Income before income tax expense	30,577	28,142
Income tax expense	4,543	3,146
Net income	$ 26,034	$ 24,996
Earnings per common share - basic (in dollars per share)	$ 0.83	$ 0.77
Earnings per common share - diluted (in dollars per share)	0.83	0.77
Cash dividends paid per common share (in dollars per share)	$ 0.35	$ 0.34

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 26,034	$ 24,996
Securities AFS and transferred securities:
Change in unrealized holding gain (loss) on AFS securities during the period	13,019	(161,901)
Change in net unrealized loss on securities transferred from AFS to HTM	0	(39,144)
Reclassification adjustment for amortization related to AFS and HTM debt securities	1,992	243
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income	2,146	1,543
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	(6,976)	20,546
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges	(5,108)	1,322
Pension plans:
Amortization of net actuarial loss, included in net periodic benefit cost	173	206
Other comprehensive income (loss), before tax	5,246	(177,185)
Income tax (expense) benefit related to items of other comprehensive income (loss)	(1,102)	37,209
Other comprehensive income (loss), net of tax	4,144	(139,976)
Comprehensive income (loss)	$ 30,178	$ (114,980)

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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)
Beginning balance, net of tax at Dec. 31, 2021	$ 912,172	$ 47,461	$ 780,501	$ 179,813	$ (155,308)	$ 59,705
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,996			24,996
Other comprehensive income (loss)	(139,976)					(139,976)
Issuance of common stock for dividend reinvestment plan	322	10	312
Purchase of common stock	(3,358)				(3,358)
Stock compensation expense	819		819
Net issuance of common stock under employee stock plans	269		182	(67)	154
Cash dividends paid on common stock	(11,003)			(11,003)
Ending balance, net of tax at Mar. 31, 2022	784,241	47,471	781,814	193,739	(158,512)	(80,271)
Beginning balance, net of tax at Dec. 31, 2022	745,997	47,501	784,545	239,610	(188,203)	(137,456)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,034			26,034
Other comprehensive income (loss)	4,144					4,144
Issuance of common stock for dividend reinvestment plan	302	10	292
Purchase of common stock	(15,945)				(15,945)
Stock compensation expense	914		914
Net issuance of common stock under employee stock plans	572		368	(91)	295
Cash dividends paid on common stock	(10,988)			(10,988)
Ending balance, net of tax at Mar. 31, 2023	$ 751,030	$ 47,511	$ 786,119	$ 254,565	$ (203,853)	$ (133,312)

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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for dividend reinvestment plan (in shares)	8,026	7,671
Common stock purchased (in shares)	457,394	82,285
Net issuance of common stock under employee stock plans (in shares)	23,919	16,551
Cash dividends paid on common stock (in dollars per share)	$ 0.35	$ 0.34

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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
OPERATING ACTIVITIES:
Net income	$ 26,034,000	$ 24,996,000
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	2,636,000	2,765,000
Securities premium amortization (discount accretion), net	3,586,000	4,804,000
Loan (discount accretion) premium amortization, net	89,000	(132,000)
Provision for (reversal of) credit losses	(40,000)	294,000
Stock compensation expense	914,000	819,000
Deferred tax expense (benefit)	(194,000)	285,000
Net (gain) loss on sale of AFS securities	2,146,000	1,543,000
Net gain on sale of equity securities	(2,416,000)	0
Loss on impairment of investments	0	38,000
Net loss on premises and equipment	4,000	334,000
Gross proceeds from sales of loans held for sale	4,309,000	5,114,000
Gross originations of loans held for sale	(4,049,000)	(5,006,000)
Net (gain) loss on OREO	(51,000)	0
Net change in:
Interest receivable	14,460,000	10,778,000
Other assets	(3,082,000)	(74,000)
Interest payable	3,253,000	728,000
Other liabilities	(23,968,000)	38,091,000
Net cash provided by (used in) operating activities	23,631,000	85,377,000
Securities AFS:
Purchases	(361,685,000)	(126,240,000)
Sales	237,316,000	118,952,000
Maturities, calls and principal repayments	8,617,000	50,269,000
Securities HTM:
Maturities, calls and principal repayments	14,970,000	2,216,000
Proceeds from sales of equity securities	3,785,000	0
Proceeds from redemption of FHLB stock and equity investments	18,370,000	11,041,000
Purchases of FHLB stock and equity investments	(25,973,000)	(57,000)
Net loan paydowns (originations)	(5,342,000)	(155,667,000)
Purchases of premises and equipment	(2,183,000)	(2,806,000)
Proceeds from sales of premises and equipment	0	3,000
Net proceeds from sales of OREO	144,000	0
Proceeds from sales of repossessed assets	93,000	30,000
Net cash provided by (used in) investing activities	(111,888,000)	(102,259,000)
FINANCING ACTIVITIES:
Net change in deposits	(359,846,000)	348,066,000
Net change in other borrowings	404,474,000	6,977,000
Proceeds from FHLB borrowings	1,078,000,000	117,000,000
Repayment of FHLB borrowings	(898,175,000)	(457,167,000)
Proceeds from stock option exercises	640,000	332,000
Cash paid to tax authority related to tax withholding on share-based awards	(68,000)	(63,000)
Purchase of common stock	(14,842,000)	(2,228,000)
Proceeds from the issuance of common stock for dividend reinvestment plan	302,000	322,000
Cash dividends paid	(10,988,000)	(11,003,000)
Net cash provided by (used in) financing activities	199,497,000	2,236,000
Net increase (decrease) in cash and cash equivalents	111,240,000	(14,646,000)
Cash and cash equivalents at beginning of period	199,252,000	201,753,000
Cash and cash equivalents at end of period	310,492,000	187,107,000
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	24,242,000	4,239,000
Income taxes paid	0	0
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	13,000	31,000
Transfer of AFS to HTM securities	0	424,895,000
Unsettled trades to purchase securities	0	(2,053,000)
Unsettled trades to sell securities	4,044,000	47,019,000
Unsettled trades to repurchase common stock	$ (957,000)	$ (1,130,000)

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Summary of Significant Accounting and Reporting Policies

3 Months Ended

Mar. 31, 2023

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, 2022. 

Accounting Changes and Reclassifications

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

Current Expected Credit Losses - Troubled Debt Restructurings and Vintage Disclosures

We adopted ASU 2022-02, “Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures” on January 1, 2023, the effective date of the guidance, on a prospective basis. ASU 2022-02 eliminated the accounting guidance for TDRs, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Specifically, rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance to determine whether a modification results in a new loan or a continuation of an existing loan. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. ASU 2022-02 did not have a material impact on our consolidated financial statements.

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. Additionally, in January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848): Scope,” which provided additional clarification that certain optional expedients and exceptions noted above apply to derivative instruments that use an interest rate for margining, discounting or contract price alignment that is modified as a result of reference rate reform. In December 2022, the FASB issued ASU 2022-06, “Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848,” which was effective upon issuance and deferred the sunset date in Topic 848 from December 31, 2022 to December 31, 2024. We established an officer level committee to guide our transition from LIBOR in October 2019 and are transitioning to alternative rates consistent with industry timelines. We continue to evaluate our LIBOR exposure. The trust preferred subordinated debentures will transition to an adjusted SOFR index in accordance with the Federal Reserve final rule implementing the Adjustable Interest Rate Act. Our cash flow hedges will transition to an adjusted SOFR index in accordance with the ISDA 2020 IBOR Fallbacks Protocol. We have identified our products that utilize LIBOR and have implemented enhanced fallback language to facilitate the transition to alternative reference rates. We have evaluated our systems and are offering alternative rates. We are no longer

offering LIBOR indexed rates on newly originated loans. ASU 2020-04 and ASU 2021-01 are not expected to have a material impact on our consolidated financial statements.

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Earnings Per Share

3 Months Ended

Mar. 31, 2023

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,
	2023		2022
Basic and Diluted Earnings:
Net income	$	26,034	$	24,996
Basic weighted-average shares outstanding	31,372		32,357
Add:  Stock awards	92		180
Diluted weighted-average shares outstanding	31,464		32,537
Basic earnings per share:
Net income	$	0.83	$	0.77
Diluted earnings per share:
Net income	$	0.83	$	0.77

For the three months ended March 31, 2023, there were approximately 121,000 anti-dilutive shares. For the three months ended March 31, 2022, there were no anti-dilutive shares.

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2023

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, 2023
	Unrealized Gains (Losses) on Securities		Unrealized Gains (Losses) on Derivatives		Retirement Plans		Total
Beginning balance, net of tax	$	(149,181)	$	31,227	$	(19,502)	$	(137,456)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	13,019		(6,976)		—		6,043
Reclassification adjustments included in net income	4,138		(5,108)		173		(797)
Income tax (expense) benefit	(3,603)		2,537		(36)		(1,102)
Net current-period other comprehensive income (loss), net of tax	13,554		(9,547)		137		4,144
Ending balance, net of tax	$	(135,627)	$	21,680	$	(19,365)	$	(133,312)

	Three Months Ended March 31, 2022
	Unrealized Gains (Losses) on Securities		Unrealized Gains (Losses) on Derivatives		Retirement Plans		Total
Beginning balance, net of tax	$	84,716	$	(1,257)	$	(23,754)	$	59,705
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	(201,045)		20,546		—		(180,499)
Reclassification adjustments included in net income	1,786		1,322		206		3,314
Income tax (expense) benefit	41,844		(4,593)		(42)		37,209
Net current-period other comprehensive income (loss), net of tax	(157,415)		17,275		164		(139,976)
Ending balance, net of tax	$	(72,699)	$	16,018	$	(23,590)	$	(80,271)

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

	Three Months Ended March 31,
	2023		2022
Unrealized gains and losses on securities transferred:
Amortization of unrealized gains and losses (1)	$	(1,992)	$	(243)
Tax benefit	418		51
Net of tax	(1,574)		(192)
Unrealized gains and losses on available for sale securities:
Realized net gain (loss) on sale of securities (2)	(2,146)		(1,543)
Tax (expense) benefit	451		324
Net of tax	(1,695)		(1,219)
Derivatives:
Realized net gain (loss) on interest rate swap derivatives (3)	5,108		(1,322)
Tax benefit	(1,072)		278
Net of tax	4,036		(1,044)
Amortization of pension plan:
Net actuarial loss (4)	(173)		(206)
Tax benefit	36		42
Net of tax	(137)		(164)
Total reclassifications for the period, net of tax	$	630	$	(2,619)

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

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

(3)    Included in interest expense for FHLB borrowings, other borrowings and deposits 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, 2023

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, 2023 and December 31, 2022 are reflected in the tables below (in thousands):

	March 31, 2023
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
U.S. Treasury	$	297,061	$	96	$	—	$	297,157
State and political subdivisions	938,822		2,023		54,373		886,472
Corporate bonds and other	14,513		33		1,135		13,411
MBS: (1)
Residential	237,426		302		7,992		229,736
Commercial	11,313		57		924		10,446
Total	$	1,499,135	$	2,511	$	64,424	$	1,437,222
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	1,038,054	$	8,703	$	126,946	$	919,811
Corporate bonds and other	146,203		561		9,821		136,943
MBS: (1)
Residential	93,399		24		6,282		87,141
Commercial	30,801		—		2,122		28,679
Total	$	1,308,457	$	9,288	$	145,171	$	1,172,574

	December 31, 2022
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
State and political subdivisions	$	1,039,453	$	956	$	75,557	$	964,852
Corporate bonds and other	8,692		26		14		8,704
MBS: (1)
Residential	328,400		250		13,623		315,027
Commercial	11,329		50		948		10,431
Total	$	1,387,874	$	1,282	$	90,142	$	1,299,014
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	1,037,556	$	3,969	$	163,283	$	878,242
Corporate bonds and other	152,552		575		7,993		145,134
MBS: (1)
Residential	93,796		21		8,343		85,474
Commercial	42,825		—		2,519		40,306
Total	$	1,326,729	$	4,565	$	182,138	$	1,149,156

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

From time to time, we transfer securities from AFS to HTM due to overall balance sheet strategies. We had no transferred securities from AFS to HTM during the three months ended March 31, 2023. We transferred securities from AFS to HTM with an estimated fair value of $1.25 billion during the year ended December 31, 2022. The remaining net unamortized, unrealized loss on the transferred securities included in AOCI in the accompanying balance sheets totaled $119.6 million ($94.5 million, net of tax) at March 31, 2023 and $121.5 million ($96.0 million, net of tax) at December 31, 2022. 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. We transferred these securities due to overall balance sheet strategies, and our management has the current intent and ability to hold these securities until maturity.

Investment securities and MBS with carrying values of $2.13 billion and $1.82 billion were pledged as of March 31, 2023 and December 31, 2022, respectively, to collateralize FHLB borrowings, borrowings from the FRDW, including from the BTFP, repurchase agreements and public fund deposits, for potential liquidity needs or other purposes as required by law.

The following tables present the fair value and unrealized losses on AFS and HTM investment securities and MBS, if applicable, for which an allowance for credit losses has not been recorded as of March 31, 2023 and December 31, 2022, segregated by major security type and length of time in a continuous loss position (in thousands):

	March 31, 2023
	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	$	152,248	$	2,179	$	625,144	$	52,194	$	777,392	$	54,373
Corporate bonds and other	13,193		1,135		—		—		13,193		1,135
MBS:
Residential	155,602		3,903		64,334		4,089		219,936		7,992
Commercial	—		—		8,167		924		8,167		924
Total	$	321,043	$	7,217	$	697,645	$	57,207	$	1,018,688	$	64,424
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	182,401	$	7,385	$	544,200	$	119,561	$	726,601	$	126,946
Corporate bonds and other	95,612		6,228		36,668		3,593		132,280		9,821
MBS:
Residential	20,893		1,114		65,539		5,168		86,432		6,282
Commercial	—		—		28,679		2,122		28,679		2,122
Total	$	298,906	$	14,727	$	675,086	$	130,444	$	973,992	$	145,171
	December 31, 2022
	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	$	859,270	$	68,683	$	26,620	$	6,874	$	885,890	$	75,557
Corporate bonds and other	3,678		14		—		—		3,678		14
MBS:
Residential	306,294		13,623		—		—		306,294		13,623
Commercial	5,613		318		2,545		630		8,158		948
Total	$	1,174,855	$	82,638	$	29,165	$	7,504	$	1,204,020	$	90,142
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	426,382	$	66,898	$	323,385	$	96,385	$	749,767	$	163,283
Corporate bonds and other	125,250		6,660		12,738		1,333		137,988		7,993
Mortgage-backed securities:
Residential	80,801		7,799		3,932		544		84,733		8,343
Commercial	40,306		2,519		—		—		40,306		2,519
Total	$	672,739	$	83,876	$	340,055	$	98,262	$	1,012,794	$	182,138

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 recognize the loss in 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 temporary 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.

As of March 31, 2023 and December 31, 2022, we did not have an allowance for credit losses on our AFS securities, based on our consideration of the qualitative factors associated with each security type in our AFS portfolio. The unrealized losses on our investment and MBS are due to changes in interest rates and spreads and other market conditions. At March 31, 2023, we had 515 AFS debt securities in an unrealized loss position. 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 corporate bonds and other investment securities consist of investment grade bonds and private placement bonds.

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 or our corporate securities, we currently apply a third-party average loss given default rate to model these securities. We elected to use the specific identification method to model our HTM 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 insignificant. 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 and investment grade corporates and private placement bonds with a long history of no credit losses, no credit loss should be recognized for these securities for the three months ended March 31, 2023 or 2022.

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, 2023, accrued interest receivable on AFS and HTM debt securities totaled $9.8 million and $8.4 million, respectively. As of December 31, 2022, accrued interest receivable on AFS and HTM debt securities totaled $16.9 million and $13.6 million, respectively. No HTM debt securities were past-due or on nonaccrual status as of March 31, 2023 or December 31, 2022.

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

	Three Months Ended March 31,
	2023		2022
U.S. Treasury	$	697	$	168
State and political subdivisions	17,099		13,332
Corporate bonds and other	1,832		1,327
MBS	4,329		4,017
Total interest income on securities	$	23,957	$	18,844

There was a $2.1 million net realized loss as a result of sales from the AFS securities portfolio for the three months ended March 31, 2023, which consisted of $3.2 million in realized losses and $1.1 million in realized gains.  There was a $1.5 million net realized loss as a result of sales from the AFS securities portfolio for the three months ended March 31, 2022, which consisted of $1.8 million in realized losses and $238,000 in realized gains. There were no sales from the HTM portfolio during the three months ended March 31, 2023 or 2022.  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, 2023, are presented below by contractual maturity (in thousands):

	March 31, 2023
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment securities:
Due in one year or less	$	297,272	$	297,367
Due after one year through five years	1,563		1,601
Due after five years through ten years	33,196		32,564
Due after ten years	918,365		865,508
	1,250,396		1,197,040
MBS:	248,739		240,182
Total	$	1,499,135	$	1,437,222

	March 31, 2023
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment securities:
Due in one year or less	$	125	$	125
Due after one year through five years	20,795		20,037
Due after five years through ten years	135,369		126,811
Due after ten years	1,027,968		909,781
	1,184,257		1,056,754
MBS:	124,200		115,820
Total	$	1,308,457	$	1,172,574

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, 2023 and December 31, 2022, we had equity investments recorded in our consolidated balance sheets of $9.9 million and $11.2 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. For the three months ended March 31, 2023, there was a net gain on the sale of equity securities of $2.4 million.

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,
	2023		2022
Net gains (losses) recognized during the period on equity investments	$	2,500	$	(275)
Less: Net gains recognized during the period on equity investments sold during the period	2,416		—
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date	$	84	$	(275)

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, 2023.

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, 2023, 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, 2023

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, 2023		December 31, 2022
Real estate loans:
Construction	$	591,894	$	559,681
1-4 family residential	672,595		663,519
Commercial	1,990,861		1,987,707
Commercial loans	388,182		412,064
Municipal loans	438,566		450,067
Loans to individuals	70,546		74,653
Total loans	4,152,644		4,147,691
Less: Allowance for loan losses	36,332		36,515
Net loans	$	4,116,312	$	4,111,176

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. 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 15 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 residential portfolio.

Commercial Real Estate Loans

Commercial real estate loans as of March 31, 2023 consisted of $1.65 billion of owner and non-owner occupied real estate, $313.4 million of loans secured by multi-family properties and $25.9 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, 2023	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2023		2022		2021		2020		2019		Prior
Construction real estate:
Pass	$	22,665	$	179,803	$	176,130	$	37,195	$	6,980	$	7,789	$	141,330	$	571,892
Pass watch	—		2,434		—		—		—		—		14,808		17,242
Special mention	—		822		1,010		—		9		—		—		1,841
Substandard	—		—		—		—		—		229		—		229
Doubtful	—		299		43		—		348		—		—		690
Total construction real estate	$	22,665	$	183,358	$	177,183	$	37,195	$	7,337	$	8,018	$	156,138	$	591,894
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
1-4 family residential real estate:
Pass	$	13,984	$	92,684	$	144,451	$	126,154	$	68,073	$	220,774	$	2,123	$	668,243
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		78		—		1,381		—		1,459
Substandard	—		2		64		210		124		2,146		42		2,588
Doubtful	—		—		—		—		—		305		—		305
Total 1-4 family residential real estate	$	13,984	$	92,686	$	144,515	$	126,442	$	68,197	$	224,606	$	2,165	$	672,595
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	49	$	—	$	49
Commercial real estate:
Pass	$	137,028	$	754,591	$	523,896	$	156,316	$	111,505	$	263,451	$	10,180	$	1,956,967
Pass watch	—		—		9,001		—		349		—		—		9,350
Special mention	—		—		—		1,820		437		945		—		3,202
Substandard	—		—		—		278		14,395		6,484		—		21,157
Doubtful	—		—		—		—		73		112		—		185
Total commercial real estate	$	137,028	$	754,591	$	532,897	$	158,414	$	126,759	$	270,992	$	10,180	$	1,990,861
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Commercial loans:
Pass	$	17,642	$	101,347	$	61,883	$	16,062	$	7,209	$	6,968	$	161,646	$	372,757
Pass watch	—		73		149		—		—		—		199		421
Special mention	—		183		4,996		27		—		269		8,318		13,793
Substandard	—		418		190		—		86		25		—		719
Doubtful	—		67		73		50		109		193		—		492
Total commercial loans	$	17,642	$	102,088	$	67,291	$	16,139	$	7,404	$	7,455	$	170,163	$	388,182
Current period gross charge-offs	$	—	$	84	$	11	$	14	$	—	$	—	$	—	$	109
Municipal loans:
Pass	$	5,679	$	63,464	$	73,606	$	55,338	$	45,918	$	187,652	$	—	$	431,657
Pass watch	—		—		—		—		507		6,402		—		6,909
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	5,679	$	63,464	$	73,606	$	55,338	$	46,425	$	194,054	$	—	$	438,566
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Loans to individuals:
Pass	$	7,504	$	24,621	$	18,476	$	10,868	$	4,219	$	2,092	$	2,704	$	70,484
Pass watch	—		—		—		—		—		—		10		10
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		5		4		—		9
Doubtful	—		—		6		—		17		20		—		43
Total loans to individuals	$	7,504	$	24,621	$	18,482	$	10,868	$	4,241	$	2,116	$	2,714	$	70,546
Current period gross charge-offs (1)	$	391	$	24	$	6	$	2	$	—	$	52	$	—	$	475
Total loans	$	204,502	$	1,220,808	$	1,013,974	$	404,396	$	260,363	$	707,241	$	341,360	$	4,152,644
Total current period gross charge-offs (1)	$	391	$	108	$	17	$	16	$	—	$	101	$	—	$	633

(1) Includes $391,000 in charged off demand deposit overdrafts reported as 2023 originations.

December 31, 2022	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2022		2021		2020		2019		2018		Prior
Construction real estate:
Pass	$	169,652	$	184,501	$	34,537	$	7,091	$	1,844	$	6,434	$	152,530	$	556,589
Pass watch	299		—		—		—		—		—		—		299
Special mention	1,858		290		—		—		—		—		—		2,148
Substandard	—		—		—		10		42		194		—		246
Doubtful	—		44		—		355		—		—		—		399
Total construction real estate	$	171,809	$	184,835	$	34,537	$	7,456	$	1,886	$	6,628	$	152,530	$	559,681
1-4 family residential real estate:
Pass	$	82,847	$	144,424	$	128,666	$	70,142	$	36,710	$	194,490	$	2,160	$	659,439
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		79		—		1,397		—		—		1,476
Substandard	3		—		217		54		32		1,942		43		2,291
Doubtful	—		—		—		—		173		140		—		313
Total 1-4 family residential real estate	$	82,850	$	144,424	$	128,962	$	70,196	$	38,312	$	196,572	$	2,203	$	663,519
Commercial real estate:
Pass	$	798,653	$	546,938	$	168,607	$	136,440	$	55,480	$	233,509	$	12,315	$	1,951,942
Pass watch	—		9,219		—		—		—		—		—		9,219
Special mention	—		—		1,832		330		115		1,849		—		4,126
Substandard	—		—		281		14,603		260		6,992		—		22,136
Doubtful	—		—		—		76		—		208		—		284
Total commercial real estate	$	798,653	$	556,157	$	170,720	$	151,449	$	55,855	$	242,558	$	12,315	$	1,987,707
Commercial loans:
Pass	$	113,678	$	68,509	$	17,852	$	8,249	$	4,820	$	3,313	$	178,951	$	395,372
Pass watch	208		13		56		—		—		—		—		277
Special mention	—		5,109		31		—		288		—		9,986		15,414
Substandard	220		116		70		110		12		9		—		537
Doubtful	68		100		—		86		210		—		—		464
Total commercial loans	$	114,174	$	73,847	$	18,009	$	8,445	$	5,330	$	3,322	$	188,937	$	412,064
Municipal loans:
Pass	$	65,258	$	74,617	$	57,147	$	47,636	$	24,576	$	173,919	$	—	$	443,153
Pass watch	—		—		—		508		403		6,003		—		6,914
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	65,258	$	74,617	$	57,147	$	48,144	$	24,979	$	179,922	$	—	$	450,067
Loans to individuals:
Pass	$	29,579	$	21,480	$	12,651	$	5,261	$	1,665	$	1,005	$	2,935	$	74,576
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		1		—		6		—		2		—		9
Doubtful	7		—		—		18		40		3		—		68
Total loans to individuals	$	29,586	$	21,481	$	12,651	$	5,285	$	1,705	$	1,010	$	2,935	$	74,653
Total loans	$	1,262,330	$	1,055,361	$	422,026	$	290,975	$	128,067	$	630,012	$	358,920	$	4,147,691

Watchlisted loans reported as 2023 originations as of March 31, 2023 and watchlisted loans reported as 2022 originations as of December 31, 2022 were, for the majority, first originated in various years prior to 2023 and 2022, respectively, but were renewed in the respective year.

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

	March 31, 2023
	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	$	455	$	299	$	—	$	754	$	591,140	$	591,894
1-4 family residential	2,562		48		359		2,969		669,626		672,595
Commercial	763		—		39		802		1,990,059		1,990,861
Commercial loans	1,929		315		94		2,338		385,844		388,182
Municipal loans	—		—		—		—		438,566		438,566
Loans to individuals	221		—		19		240		70,306		70,546
Total	$	5,930	$	662	$	511	$	7,103	$	4,145,541	$	4,152,644

	December 31, 2022
	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	$	43	$	21	$	—	$	64	$	559,617	$	559,681
1-4 family residential	3,529		368		214		4,111		659,408		663,519
Commercial	105		153		415		673		1,987,034		1,987,707
Commercial loans	515		277		247		1,039		411,025		412,064
Municipal loans	—		—		—		—		450,067		450,067
Loans to individuals	203		3		40		246		74,407		74,653
Total	$	4,395	$	822	$	916	$	6,133	$	4,141,558	$	4,147,691

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

	March 31, 2023		December 31, 2022
Nonaccrual loans:
Real estate loans:
Construction	$	695	$	405
1-4 family residential	933		848
Commercial	582		762
Commercial loans	911		757
Loans to individuals	48		74
Total nonaccrual loans (1)	3,169		2,846
Accruing loans past due more than 90 days	—		—
Restructured loans (2)	—		7,849
OREO	—		93
Repossessed assets	11		74
Total nonperforming assets	$	3,180	$	10,862

(1)    Includes $179,000 and $897,000 of restructured loans as of March 31, 2023 and December 31, 2022, respectively.

(2) Pursuant to our adoption of ASU 2022-02, effective January 1, 2023, we prospectively discontinued the recognition and measurement guidance previously required on troubled debt restructures. As a result, “restructured” loans as of March 31, 2023 exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures.

We reversed $26,000 of interest income on nonaccrual loans during the three months ended March 31, 2023, and $12,000 for the three months ended March 31, 2022. We had $1.3 million and $1.6 million of loans on nonaccrual for which there was no related allowance for credit losses as of March 31, 2023 and December 31, 2022, 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, 2023 and December 31, 2022, we had $8.3 million and $8.1 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 no loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of March 31, 2023 and December 31, 2022, respectively.

Restructured Loans

Pursuant to our adoption of ASU 2022-02 effective January 1, 2023, we prospectively discontinued the recognition and measurement of TDRs. This guidance eliminated TDR accounting for loans in which the borrower was experiencing financial difficulty and the creditor granted a concession. See “Note 1 - Summary of Significant Accounting and Reporting Policies” to our consolidated financial statements included in this report.

A loan is now considered restructured if the borrower is experiencing financial difficulties and the loan has been modified. Modifications 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 modifications 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 most instances, interest will continue to be charged on principal balances outstanding during the extended term. Therefore, the financial effects of the recorded investment of loans restructured during the three months ended March 31, 2023 were not significant.

There was one commercial loan for $179,000 that was restructured with an extension of amortization period as of March 31, 2023 and is included in our nonaccrual loans in nonperforming assets.

On an ongoing basis, the performance of the restructured loans is monitored for subsequent payment default. Payment default is recognized when the borrower is 90 days or more past due. As of March 31, 2023, there were no restructured loans in default. Payment defaults for restructured loans did not significantly impact the determination of the allowance for loan losses in the periods presented. At March 31, 2023, there were no commitments to lend additional funds to borrowers whose loans had been restructured.

Allowance for Loan Losses

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, 2023
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,164	$	2,173	$	28,701	$	2,235	$	45	$	197	$	36,515
Loans charged-off	—		(49)		—		(109)		—		(475)		(633)
Recoveries of loans charged-off	1		5		—		60		—		296		362
Net loans (charged-off) recovered	1		(44)		—		(49)		—		(179)		(271)
Provision for (reversal of) loan losses	(13)		185		20		(285)		(1)		182		88
Balance at end of period	$	3,152	$	2,314	$	28,721	$	1,901	$	44	$	200	$	36,332

	Three Months Ended March 31, 2022
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,787	$	1,866	$	26,980	$	2,397	$	47	$	196	$	35,273
Loans charged-off	—		—		—		(131)		—		(424)		(555)
Recoveries of loans charged-off	—		39		47		216		—		238		540
Net loans (charged-off) recovered	—		39		47		85		—		(186)		(15)
Provision for (reversal of) loan losses	(183)		77		198		(28)		1		201		266
Balance at end of period	$	3,604	$	1,982	$	27,225	$	2,454	$	48	$	211	$	35,524

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, 2023 and December 31, 2022, the accrued interest on our loan portfolio was $16.7 million and $18.8 million, respectively.

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Borrowing Arrangements

3 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Borrowing Arrangements

Borrowing Arrangements

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

	March 31, 2023			December 31, 2022
Other borrowings:
Balance at end of period	$	625,627		$	221,153
Average amount outstanding during the period (1)	202,135			77,845
Maximum amount outstanding during the period (2)	625,627			316,563
Weighted average interest rate during the period (3)	4.9		%	2.4		%
Interest rate at end of period (4)	4.6		%	4.1		%
FHLB borrowings:
Balance at end of period	$	333,183		$	153,358
Average amount outstanding during the period (1)	404,199			135,926
Maximum amount outstanding during the period (2)	533,242			423,645
Weighted average interest rate during the period (3)	3.2		%	2.4		%
Interest rate at end of period (5)	5.2		%	4.7		%

(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 other borrowings and FHLB borrowings includes the effect of interest rate swaps.

(4)Stated rate.

(5)The interest rate on FHLB borrowings includes the effect of interest rate swaps.

Maturities of the obligations associated with our borrowing arrangements based on scheduled repayments at March 31, 2023 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	$	621,527	$	2,750	$	1,350	$	—	$	—	$	—	$	625,627
FHLB borrowings	330,717		748		775		391		411		141		333,183
Total obligations	$	952,244	$	3,498	$	2,125	$	391	$	411	$	141	$	958,810

Other borrowings may include federal funds purchased, repurchase agreements and borrowings from the Federal Reserve through the FRDW and BTFP. 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, 2023 or December 31, 2022.  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, 2023, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities, was approximately $282.8 million. There were $350.0 million and $188.0 million in borrowings from the FRDW at March 31, 2023 and December 31, 2022, respectively. To provide more stability and to assure banks have the ability to meet the needs of all their depositors, the Federal Reserve created the BTFP in the first quarter of 2023. At March 31, 2023, the amount of additional funding the Bank could obtain from the BTFP, collateralized by securities, was approximately $3.1 million. There were $198.4 million in borrowings from the BTFP at March 31, 2023. 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, 2023, the line had one outstanding letter of credit for $155,000. 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 $77.2 million at March 31, 2023 and $33.2 million at December 31, 2022, and had maturities of less than 3.0 years.  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 3.73% to 5.33% and with remaining maturities of 13 days to 5.3 years at March 31, 2023.  FHLB borrowings may be collateralized by FHLB stock, nonspecified loans and/or securities. At March 31, 2023, the amount of additional funding Southside Bank could obtain from FHLB, collateralized by securities, FHLB stock and nonspecified loans and securities, was approximately $1.53 billion, net of FHLB stock purchases required.

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Long-term Debt

3 Months Ended

Mar. 31, 2023

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, 2023		December 31, 2022
Subordinated notes: (1)
3.875% Subordinated notes, net of unamortized debt issuance costs (2)	$	98,710	$	98,674
Total Subordinated notes	98,710		98,674
Trust preferred subordinated debentures: (3)
Southside Statutory Trust III, net of unamortized debt issuance costs (4)	20,574		20,573
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	60,266		60,265
Total Long-term debt	$	158,976	$	158,939

(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 $1.3 million at March 31, 2023 and December 31, 2022.

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

(4)The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $45,000 at March 31, 2023 and $46,000 at December 31, 2022.

As of March 31, 2023, 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
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)	May 20, 2005	$	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 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, 2023

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,
	Retirement Plan				Acquired Retirement Plan				Restoration Plan
	2023		2022		2023		2022		2023		2022
Interest cost	$	925	$	680	$	32	$	26	$	206	$	139
Expected return on assets	(1,143)		(1,461)		(47)		(59)		—		—
Net loss amortization	166		151		—		—		7		55
Net periodic benefit cost (income)	$	(52)	$	(630)	$	(15)	$	(33)	$	213	$	194

The noncash adjustment to the employee benefit plan liabilities, consisting of changes in net loss, was $173,000 and $206,000 for the three months ended March 31, 2023 and 2022, respectively.

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Derivative Financial Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2023

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-parties. 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 $880.0 million of Bank liabilities. 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 or SOFR rate.

During 2022, we entered into partial term fair value hedges, as allowed under ASU 2017-12, for certain of our fixed rate callable AFS municipal securities. The instruments are designated as fair value hedges as the changes in the fair value of the interest rate swap are expected to offset changes in the fair value of the hedged item attributable to changes in the SOFR swap rate, the designated benchmark interest rate. As of March 31, 2023, hedged securities with a carrying amount of $759.7 million are included in our AFS securities portfolio in our consolidated balance sheets. These derivative contracts involve the receipt of floating rate interest from a counterparty in exchange for us making fixed-rate payments over the life of the agreement, without the exchange of the underlying notional value. The change in the fair value of these hedging instruments is recorded in AOCI and is subsequently reclassified into earnings in the period that the hedged transactions affects earnings.

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, 2023 and December 31, 2022, net derivative assets included $53.3 million and $82.1 million, respectively, of cash collateral received from counterparties under master netting agreements.

The notional amounts of the derivative instruments represent the contractual cash flows pertaining to the underlying agreements. These amounts are not exchanged and are not reflected in the consolidated balance sheets. The fair value of the interest rate swaps are presented at net in other assets and other liabilities and in the net change in each of these financial statement line items in the accompanying consolidated statements of cash flows 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, 2023						December 31, 2022
			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	$	880,000	$	32,886	$	5,443	$	575,000	$	39,527	$	—
Swaps-Fair Value Hedge-Financial institution counterparties	742,675		13,035		3,246		742,675		21,733		171
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	220,999		16,018		—		223,124		21,046		—
Swaps-Customer counterparties	220,999		—		16,018		223,124		—		21,046
Gross derivatives			61,939		24,707				82,306		21,217
Offsetting derivative assets/liabilities			(8,689)		(8,689)				(171)		(171)
Cash collateral received/posted			(53,250)		—				(82,135)		—
Net derivatives included in the consolidated balance sheets (2)			$	—	$	16,018			$	—	$	21,046

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

(2)    Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at March 31, 2023 or December 31, 2022. 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 or overnight SOFR rates in effect at March 31, 2023 and December 31, 2022:

	March 31, 2023							December 31, 2022
			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	$	880,000	3.0	4.77	%	2.20	%	$	575,000	2.3	4.44	%	1.13	%
Swaps-Fair Value hedge
Financial institution counterparties	742,675		6.0	4.56	%	3.21	%	742,675		6.3	3.42	%	3.21	%
Swaps-Non-hedging
Financial institution counterparties	220,999		8.8	5.29	%	2.68	%	223,124		9.0	4.83	%	2.69	%
Customer counterparties	220,999		8.8	2.68	%	5.29	%	223,124		9.0	2.69	%	4.83	%

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Fair Value Measurement

3 Months Ended

Mar. 31, 2023

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 most of 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, 2023 and December 31, 2022.

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 – 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, 2023 and December 31, 2022, 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, 2023	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	$	297,157	$	297,157	$	—	$	—
State and political subdivisions	886,472		—		886,472		—
Corporate bonds and other	13,411		—		13,411		—
MBS: (1)
Residential	229,736		—		229,736		—
Commercial	10,446		—		10,446		—
Equity investments:
Equity investments	5,319		5,319		—		—
Derivative assets:
Interest rate swaps	61,939		—		61,939		—
Total asset recurring fair value measurements	$	1,504,480	$	302,476	$	1,202,004	$	—
Derivative liabilities:
Interest rate swaps	$	24,707	$	—	$	24,707	$	—
Total liability recurring fair value measurements	$	24,707	$	—	$	24,707	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	11	$	—	$	—	$	11
Collateral-dependent loans (2)	7,857		—		—		7,857
Total asset nonrecurring fair value measurements	$	7,868	$	—	$	—	$	7,868

			Fair Value Measurements at the End of the Reporting Period Using
December 31, 2022	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	$	964,852	$	—	$	964,852	$	—
Corporate bonds and other	8,704		—		8,704		—
MBS: (1)
Residential	315,027		—		315,027		—
Commercial	10,431		—		10,431		—
Equity investments:
Equity investments	5,235		5,235		—		—
Derivative assets:
Interest rate swaps	82,306		—		82,306		—
Total asset recurring fair value measurements	$	1,386,555	$	5,235	$	1,381,320	$	—
Derivative liabilities:
Interest rate swaps	$	21,217	$	—	$	21,217	$	—
Total liability recurring fair value measurements	$	21,217	$	—	$	21,217	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	167	$	—	$	—	$	167
Collateral-dependent loans (2)	7,815		—		—		7,815
Total asset nonrecurring fair value measurements	$	7,982	$	—	$	—	$	7,982

(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. Borrowings from the Federal Reserve through the FRDW and BTFP have original maturities of one year or less, and the fair value 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.

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, 2023	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	310,492	$	310,492	$	310,492	$	—	$	—
Investment securities:
HTM, at carrying value	1,184,257		1,056,754		—		1,056,754		—
MBS:
HTM, at carrying value	124,200		115,820		—		115,820		—
FHLB stock, at cost	16,696		16,696		—		16,696		—
Equity investments	4,590		4,590		—		4,590		—
Loans, net of allowance for loan losses	4,116,312		3,861,859		—		—		3,861,859
Loans held for sale	407		407		—		407		—
Financial liabilities:
Deposits	$	5,838,220	$	5,807,050	$	—	$	5,807,050	$	—
Other borrowings	625,627		630,270		—		630,270		—
FHLB borrowings	333,183		321,144		—		321,144		—
Subordinated notes, net of unamortized debt issuance costs	98,710		89,952		—		89,952		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,266		54,520		—		54,520		—

			Estimated Fair Value
December 31, 2022	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	199,252	$	199,252	$	199,252	$	—	$	—
Investment securities:
HTM, at carrying value	1,190,108		1,023,376		—		1,023,376		—
Mortgage-backed securities:
HTM, at carrying value	136,621		125,780		—		125,780		—
FHLB stock, at cost	9,190		9,190		—		9,190		—
Equity investments	5,946		5,946		—		5,946		—
Loans, net of allowance for loan losses	4,111,176		3,880,664		—		—		3,880,664
Loans held for sale	667		667		—		667		—
Financial liabilities:
Deposits	$	6,198,019	$	6,158,517	$	—	$	6,158,517	$	—
Other borrowings	221,153		221,153		—		221,153		—
FHLB borrowings	153,358		140,976		—		140,976		—
Subordinated notes, net of unamortized debt issuance costs	98,674		91,357		—		91,357		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,265		60,594		—		60,594		—

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Income Taxes

3 Months Ended

Mar. 31, 2023

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,
	2023		2022
Current income tax expense	$	4,737	$	2,861
Deferred income tax expense (benefit)	(194)		285
Income tax expense	$	4,543	$	3,146

The net deferred tax asset totaled $33.8 million at March 31, 2023 as compared to $34.7 million at December 31, 2022. The decrease in the net deferred tax asset is primarily the result of a decrease in unrealized losses in the AFS securities portfolio.  No valuation allowance was recorded at March 31, 2023 or December 31, 2022, 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, 2023 or December 31, 2022.

We recognized income tax expense of $4.5 million for an ETR of 14.9% for the three months ended March 31, 2023, compared to income tax expense of $3.1 million, for an ETR of 11.2% for the three months ended March 31, 2022. The higher ETR for the three months ended March 31, 2023 was primarily due to a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same period in 2022. The ETR differs from the statutory rate of 21% for the three months ended March 31, 2023 and 2022 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 2019 or Texas state tax examinations by tax authorities for years before 2018.

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Off-Balance-Sheet Arrangements, Commitments and Contingencies

3 Months Ended

Mar. 31, 2023

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,
	2023		2022
Balance at beginning of period	$	3,687	$	2,384
Provision for (reversal of) off-balance-sheet credit exposures	(128)		28
Balance at end of period	$	3,559	$	2,412

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, 2023		December 31, 2022
Commitments to extend credit	$	1,274,326	$	1,296,773
Standby letters of credit	25,959		26,844
Total	$	1,300,285	$	1,323,617

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 both the three months ended March 31, 2023, there were $192,000 operating lease ROU assets obtained in exchange for new operating lease liabilities. During the three months ended March 31, 2022, there were no operating lease ROU assets obtained in exchange for new operating lease liabilities.

Securities. In the normal course of business we buy and sell securities. At March 31, 2023, there were no unsettled trades to purchase securities and $4.0 million unsettled trades to sell securities. At December 31, 2022, 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, 2023 or December 31, 2022.

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, 2023

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, 2022.

Reclassifications

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

Current Expected Credit Losses - Troubled Debt Restructurings and Vintage Disclosures

We adopted ASU 2022-02, “Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures” on January 1, 2023, the effective date of the guidance, on a prospective basis. ASU 2022-02 eliminated the accounting guidance for TDRs, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Specifically, rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance to determine whether a modification results in a new loan or a continuation of an existing loan. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. ASU 2022-02 did not have a material impact on our consolidated financial statements.

Accounting Changes and Reclassifications and Accounting Pronouncements

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. Additionally, in January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848): Scope,” which provided additional clarification that certain optional expedients and exceptions noted above apply to derivative instruments that use an interest rate for margining, discounting or contract price alignment that is modified as a result of reference rate reform. In December 2022, the FASB issued ASU 2022-06, “Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848,” which was effective upon issuance and deferred the sunset date in Topic 848 from December 31, 2022 to December 31, 2024. We established an officer level committee to guide our transition from LIBOR in October 2019 and are transitioning to alternative rates consistent with industry timelines. We continue to evaluate our LIBOR exposure. The trust preferred subordinated debentures will transition to an adjusted SOFR index in accordance with the Federal Reserve final rule implementing the Adjustable Interest Rate Act. Our cash flow hedges will transition to an adjusted SOFR index in accordance with the ISDA 2020 IBOR Fallbacks Protocol. We have identified our products that utilize LIBOR and have implemented enhanced fallback language to facilitate the transition to alternative reference rates. We have evaluated our systems and are offering alternative rates. We are no longer

offering LIBOR indexed rates on newly originated loans. ASU 2020-04 and ASU 2021-01 are 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, 2023

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,
	2023		2022
Basic and Diluted Earnings:
Net income	$	26,034	$	24,996
Basic weighted-average shares outstanding	31,372		32,357
Add:  Stock awards	92		180
Diluted weighted-average shares outstanding	31,464		32,537
Basic earnings per share:
Net income	$	0.83	$	0.77
Diluted earnings per share:
Net income	$	0.83	$	0.77

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023
	Unrealized Gains (Losses) on Securities		Unrealized Gains (Losses) on Derivatives		Retirement Plans		Total
Beginning balance, net of tax	$	(149,181)	$	31,227	$	(19,502)	$	(137,456)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	13,019		(6,976)		—		6,043
Reclassification adjustments included in net income	4,138		(5,108)		173		(797)
Income tax (expense) benefit	(3,603)		2,537		(36)		(1,102)
Net current-period other comprehensive income (loss), net of tax	13,554		(9,547)		137		4,144
Ending balance, net of tax	$	(135,627)	$	21,680	$	(19,365)	$	(133,312)

	Three Months Ended March 31, 2022
	Unrealized Gains (Losses) on Securities		Unrealized Gains (Losses) on Derivatives		Retirement Plans		Total
Beginning balance, net of tax	$	84,716	$	(1,257)	$	(23,754)	$	59,705
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassifications	(201,045)		20,546		—		(180,499)
Reclassification adjustments included in net income	1,786		1,322		206		3,314
Income tax (expense) benefit	41,844		(4,593)		(42)		37,209
Net current-period other comprehensive income (loss), net of tax	(157,415)		17,275		164		(139,976)
Ending balance, net of tax	$	(72,699)	$	16,018	$	(23,590)	$	(80,271)

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,
	2023		2022
Unrealized gains and losses on securities transferred:
Amortization of unrealized gains and losses (1)	$	(1,992)	$	(243)
Tax benefit	418		51
Net of tax	(1,574)		(192)
Unrealized gains and losses on available for sale securities:
Realized net gain (loss) on sale of securities (2)	(2,146)		(1,543)
Tax (expense) benefit	451		324
Net of tax	(1,695)		(1,219)
Derivatives:
Realized net gain (loss) on interest rate swap derivatives (3)	5,108		(1,322)
Tax benefit	(1,072)		278
Net of tax	4,036		(1,044)
Amortization of pension plan:
Net actuarial loss (4)	(173)		(206)
Tax benefit	36		42
Net of tax	(137)		(164)
Total reclassifications for the period, net of tax	$	630	$	(2,619)

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

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

(3)    Included in interest expense for FHLB borrowings, other borrowings and deposits 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, 2023

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, 2023 and December 31, 2022 are reflected in the tables below (in thousands):

	March 31, 2023
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
U.S. Treasury	$	297,061	$	96	$	—	$	297,157
State and political subdivisions	938,822		2,023		54,373		886,472
Corporate bonds and other	14,513		33		1,135		13,411
MBS: (1)
Residential	237,426		302		7,992		229,736
Commercial	11,313		57		924		10,446
Total	$	1,499,135	$	2,511	$	64,424	$	1,437,222
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	1,038,054	$	8,703	$	126,946	$	919,811
Corporate bonds and other	146,203		561		9,821		136,943
MBS: (1)
Residential	93,399		24		6,282		87,141
Commercial	30,801		—		2,122		28,679
Total	$	1,308,457	$	9,288	$	145,171	$	1,172,574

	December 31, 2022
	Amortized		Gross Unrealized		Gross Unrealized		Estimated
AVAILABLE FOR SALE	Cost		Gains		Losses		Fair Value
Investment securities:
State and political subdivisions	$	1,039,453	$	956	$	75,557	$	964,852
Corporate bonds and other	8,692		26		14		8,704
MBS: (1)
Residential	328,400		250		13,623		315,027
Commercial	11,329		50		948		10,431
Total	$	1,387,874	$	1,282	$	90,142	$	1,299,014
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	1,037,556	$	3,969	$	163,283	$	878,242
Corporate bonds and other	152,552		575		7,993		145,134
MBS: (1)
Residential	93,796		21		8,343		85,474
Commercial	42,825		—		2,519		40,306
Total	$	1,326,729	$	4,565	$	182,138	$	1,149,156

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

Unrealized loss on securities

The following tables present the fair value and unrealized losses on AFS and HTM investment securities and MBS, if applicable, for which an allowance for credit losses has not been recorded as of March 31, 2023 and December 31, 2022, segregated by major security type and length of time in a continuous loss position (in thousands):

	March 31, 2023
	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	$	152,248	$	2,179	$	625,144	$	52,194	$	777,392	$	54,373
Corporate bonds and other	13,193		1,135		—		—		13,193		1,135
MBS:
Residential	155,602		3,903		64,334		4,089		219,936		7,992
Commercial	—		—		8,167		924		8,167		924
Total	$	321,043	$	7,217	$	697,645	$	57,207	$	1,018,688	$	64,424
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	182,401	$	7,385	$	544,200	$	119,561	$	726,601	$	126,946
Corporate bonds and other	95,612		6,228		36,668		3,593		132,280		9,821
MBS:
Residential	20,893		1,114		65,539		5,168		86,432		6,282
Commercial	—		—		28,679		2,122		28,679		2,122
Total	$	298,906	$	14,727	$	675,086	$	130,444	$	973,992	$	145,171
	December 31, 2022
	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	$	859,270	$	68,683	$	26,620	$	6,874	$	885,890	$	75,557
Corporate bonds and other	3,678		14		—		—		3,678		14
MBS:
Residential	306,294		13,623		—		—		306,294		13,623
Commercial	5,613		318		2,545		630		8,158		948
Total	$	1,174,855	$	82,638	$	29,165	$	7,504	$	1,204,020	$	90,142
HELD TO MATURITY
Investment securities:
State and political subdivisions	$	426,382	$	66,898	$	323,385	$	96,385	$	749,767	$	163,283
Corporate bonds and other	125,250		6,660		12,738		1,333		137,988		7,993
Mortgage-backed securities:
Residential	80,801		7,799		3,932		544		84,733		8,343
Commercial	40,306		2,519		—		—		40,306		2,519
Total	$	672,739	$	83,876	$	340,055	$	98,262	$	1,012,794	$	182,138

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,
	2023		2022
U.S. Treasury	$	697	$	168
State and political subdivisions	17,099		13,332
Corporate bonds and other	1,832		1,327
MBS	4,329		4,017
Total interest income on securities	$	23,957	$	18,844

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, 2023, are presented below by contractual maturity (in thousands):

	March 31, 2023
	Amortized Cost		Fair Value
AVAILABLE FOR SALE
Investment securities:
Due in one year or less	$	297,272	$	297,367
Due after one year through five years	1,563		1,601
Due after five years through ten years	33,196		32,564
Due after ten years	918,365		865,508
	1,250,396		1,197,040
MBS:	248,739		240,182
Total	$	1,499,135	$	1,437,222

	March 31, 2023
	Amortized Cost		Fair Value
HELD TO MATURITY
Investment securities:
Due in one year or less	$	125	$	125
Due after one year through five years	20,795		20,037
Due after five years through ten years	135,369		126,811
Due after ten years	1,027,968		909,781
	1,184,257		1,056,754
MBS:	124,200		115,820
Total	$	1,308,457	$	1,172,574

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,
	2023		2022
Net gains (losses) recognized during the period on equity investments	$	2,500	$	(275)
Less: Net gains recognized during the period on equity investments sold during the period	2,416		—
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date	$	84	$	(275)

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Loans and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2023

Receivables [Abstract]

Loans by Portfolio Segment

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

	March 31, 2023		December 31, 2022
Real estate loans:
Construction	$	591,894	$	559,681
1-4 family residential	672,595		663,519
Commercial	1,990,861		1,987,707
Commercial loans	388,182		412,064
Municipal loans	438,566		450,067
Loans to individuals	70,546		74,653
Total loans	4,152,644		4,147,691
Less: Allowance for loan losses	36,332		36,515
Net loans	$	4,116,312	$	4,111,176

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, 2023	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2023		2022		2021		2020		2019		Prior
Construction real estate:
Pass	$	22,665	$	179,803	$	176,130	$	37,195	$	6,980	$	7,789	$	141,330	$	571,892
Pass watch	—		2,434		—		—		—		—		14,808		17,242
Special mention	—		822		1,010		—		9		—		—		1,841
Substandard	—		—		—		—		—		229		—		229
Doubtful	—		299		43		—		348		—		—		690
Total construction real estate	$	22,665	$	183,358	$	177,183	$	37,195	$	7,337	$	8,018	$	156,138	$	591,894
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
1-4 family residential real estate:
Pass	$	13,984	$	92,684	$	144,451	$	126,154	$	68,073	$	220,774	$	2,123	$	668,243
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		78		—		1,381		—		1,459
Substandard	—		2		64		210		124		2,146		42		2,588
Doubtful	—		—		—		—		—		305		—		305
Total 1-4 family residential real estate	$	13,984	$	92,686	$	144,515	$	126,442	$	68,197	$	224,606	$	2,165	$	672,595
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	49	$	—	$	49
Commercial real estate:
Pass	$	137,028	$	754,591	$	523,896	$	156,316	$	111,505	$	263,451	$	10,180	$	1,956,967
Pass watch	—		—		9,001		—		349		—		—		9,350
Special mention	—		—		—		1,820		437		945		—		3,202
Substandard	—		—		—		278		14,395		6,484		—		21,157
Doubtful	—		—		—		—		73		112		—		185
Total commercial real estate	$	137,028	$	754,591	$	532,897	$	158,414	$	126,759	$	270,992	$	10,180	$	1,990,861
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Commercial loans:
Pass	$	17,642	$	101,347	$	61,883	$	16,062	$	7,209	$	6,968	$	161,646	$	372,757
Pass watch	—		73		149		—		—		—		199		421
Special mention	—		183		4,996		27		—		269		8,318		13,793
Substandard	—		418		190		—		86		25		—		719
Doubtful	—		67		73		50		109		193		—		492
Total commercial loans	$	17,642	$	102,088	$	67,291	$	16,139	$	7,404	$	7,455	$	170,163	$	388,182
Current period gross charge-offs	$	—	$	84	$	11	$	14	$	—	$	—	$	—	$	109
Municipal loans:
Pass	$	5,679	$	63,464	$	73,606	$	55,338	$	45,918	$	187,652	$	—	$	431,657
Pass watch	—		—		—		—		507		6,402		—		6,909
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	5,679	$	63,464	$	73,606	$	55,338	$	46,425	$	194,054	$	—	$	438,566
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Loans to individuals:
Pass	$	7,504	$	24,621	$	18,476	$	10,868	$	4,219	$	2,092	$	2,704	$	70,484
Pass watch	—		—		—		—		—		—		10		10
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		5		4		—		9
Doubtful	—		—		6		—		17		20		—		43
Total loans to individuals	$	7,504	$	24,621	$	18,482	$	10,868	$	4,241	$	2,116	$	2,714	$	70,546
Current period gross charge-offs (1)	$	391	$	24	$	6	$	2	$	—	$	52	$	—	$	475
Total loans	$	204,502	$	1,220,808	$	1,013,974	$	404,396	$	260,363	$	707,241	$	341,360	$	4,152,644
Total current period gross charge-offs (1)	$	391	$	108	$	17	$	16	$	—	$	101	$	—	$	633

(1) Includes $391,000 in charged off demand deposit overdrafts reported as 2023 originations.

December 31, 2022	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
	2022		2021		2020		2019		2018		Prior
Construction real estate:
Pass	$	169,652	$	184,501	$	34,537	$	7,091	$	1,844	$	6,434	$	152,530	$	556,589
Pass watch	299		—		—		—		—		—		—		299
Special mention	1,858		290		—		—		—		—		—		2,148
Substandard	—		—		—		10		42		194		—		246
Doubtful	—		44		—		355		—		—		—		399
Total construction real estate	$	171,809	$	184,835	$	34,537	$	7,456	$	1,886	$	6,628	$	152,530	$	559,681
1-4 family residential real estate:
Pass	$	82,847	$	144,424	$	128,666	$	70,142	$	36,710	$	194,490	$	2,160	$	659,439
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		79		—		1,397		—		—		1,476
Substandard	3		—		217		54		32		1,942		43		2,291
Doubtful	—		—		—		—		173		140		—		313
Total 1-4 family residential real estate	$	82,850	$	144,424	$	128,962	$	70,196	$	38,312	$	196,572	$	2,203	$	663,519
Commercial real estate:
Pass	$	798,653	$	546,938	$	168,607	$	136,440	$	55,480	$	233,509	$	12,315	$	1,951,942
Pass watch	—		9,219		—		—		—		—		—		9,219
Special mention	—		—		1,832		330		115		1,849		—		4,126
Substandard	—		—		281		14,603		260		6,992		—		22,136
Doubtful	—		—		—		76		—		208		—		284
Total commercial real estate	$	798,653	$	556,157	$	170,720	$	151,449	$	55,855	$	242,558	$	12,315	$	1,987,707
Commercial loans:
Pass	$	113,678	$	68,509	$	17,852	$	8,249	$	4,820	$	3,313	$	178,951	$	395,372
Pass watch	208		13		56		—		—		—		—		277
Special mention	—		5,109		31		—		288		—		9,986		15,414
Substandard	220		116		70		110		12		9		—		537
Doubtful	68		100		—		86		210		—		—		464
Total commercial loans	$	114,174	$	73,847	$	18,009	$	8,445	$	5,330	$	3,322	$	188,937	$	412,064
Municipal loans:
Pass	$	65,258	$	74,617	$	57,147	$	47,636	$	24,576	$	173,919	$	—	$	443,153
Pass watch	—		—		—		508		403		6,003		—		6,914
Special mention	—		—		—		—		—		—		—		—
Substandard	—		—		—		—		—		—		—		—
Doubtful	—		—		—		—		—		—		—		—
Total municipal loans	$	65,258	$	74,617	$	57,147	$	48,144	$	24,979	$	179,922	$	—	$	450,067
Loans to individuals:
Pass	$	29,579	$	21,480	$	12,651	$	5,261	$	1,665	$	1,005	$	2,935	$	74,576
Pass watch	—		—		—		—		—		—		—		—
Special mention	—		—		—		—		—		—		—		—
Substandard	—		1		—		6		—		2		—		9
Doubtful	7		—		—		18		40		3		—		68
Total loans to individuals	$	29,586	$	21,481	$	12,651	$	5,285	$	1,705	$	1,010	$	2,935	$	74,653
Total loans	$	1,262,330	$	1,055,361	$	422,026	$	290,975	$	128,067	$	630,012	$	358,920	$	4,147,691

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, 2023
	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	$	455	$	299	$	—	$	754	$	591,140	$	591,894
1-4 family residential	2,562		48		359		2,969		669,626		672,595
Commercial	763		—		39		802		1,990,059		1,990,861
Commercial loans	1,929		315		94		2,338		385,844		388,182
Municipal loans	—		—		—		—		438,566		438,566
Loans to individuals	221		—		19		240		70,306		70,546
Total	$	5,930	$	662	$	511	$	7,103	$	4,145,541	$	4,152,644

	December 31, 2022
	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	$	43	$	21	$	—	$	64	$	559,617	$	559,681
1-4 family residential	3,529		368		214		4,111		659,408		663,519
Commercial	105		153		415		673		1,987,034		1,987,707
Commercial loans	515		277		247		1,039		411,025		412,064
Municipal loans	—		—		—		—		450,067		450,067
Loans to individuals	203		3		40		246		74,407		74,653
Total	$	4,395	$	822	$	916	$	6,133	$	4,141,558	$	4,147,691

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, 2023		December 31, 2022
Nonaccrual loans:
Real estate loans:
Construction	$	695	$	405
1-4 family residential	933		848
Commercial	582		762
Commercial loans	911		757
Loans to individuals	48		74
Total nonaccrual loans (1)	3,169		2,846
Accruing loans past due more than 90 days	—		—
Restructured loans (2)	—		7,849
OREO	—		93
Repossessed assets	11		74
Total nonperforming assets	$	3,180	$	10,862

(1)    Includes $179,000 and $897,000 of restructured loans as of March 31, 2023 and December 31, 2022, respectively.

(2) Pursuant to our adoption of ASU 2022-02, effective January 1, 2023, we prospectively discontinued the recognition and measurement guidance previously required on troubled debt restructures. As a result, “restructured” loans as of March 31, 2023 exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures.

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, 2023
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,164	$	2,173	$	28,701	$	2,235	$	45	$	197	$	36,515
Loans charged-off	—		(49)		—		(109)		—		(475)		(633)
Recoveries of loans charged-off	1		5		—		60		—		296		362
Net loans (charged-off) recovered	1		(44)		—		(49)		—		(179)		(271)
Provision for (reversal of) loan losses	(13)		185		20		(285)		(1)		182		88
Balance at end of period	$	3,152	$	2,314	$	28,721	$	1,901	$	44	$	200	$	36,332

	Three Months Ended March 31, 2022
	Real Estate
	Construction		1-4 Family Residential		Commercial		Commercial Loans		Municipal Loans		Loans to Individuals		Total
Balance at beginning of period	$	3,787	$	1,866	$	26,980	$	2,397	$	47	$	196	$	35,273
Loans charged-off	—		—		—		(131)		—		(424)		(555)
Recoveries of loans charged-off	—		39		47		216		—		238		540
Net loans (charged-off) recovered	—		39		47		85		—		(186)		(15)
Provision for (reversal of) loan losses	(183)		77		198		(28)		1		201		266
Balance at end of period	$	3,604	$	1,982	$	27,225	$	2,454	$	48	$	211	$	35,524

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Borrowing Arrangements (Tables)

3 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Schedule of Debt

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

	March 31, 2023			December 31, 2022
Other borrowings:
Balance at end of period	$	625,627		$	221,153
Average amount outstanding during the period (1)	202,135			77,845
Maximum amount outstanding during the period (2)	625,627			316,563
Weighted average interest rate during the period (3)	4.9		%	2.4		%
Interest rate at end of period (4)	4.6		%	4.1		%
FHLB borrowings:
Balance at end of period	$	333,183		$	153,358
Average amount outstanding during the period (1)	404,199			135,926
Maximum amount outstanding during the period (2)	533,242			423,645
Weighted average interest rate during the period (3)	3.2		%	2.4		%
Interest rate at end of period (5)	5.2		%	4.7		%

(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 other borrowings and FHLB borrowings includes the effect of interest rate swaps.

(4)Stated rate.

(5)The interest rate on FHLB borrowings includes the effect of interest rate swaps.

Schedule of Maturities of Borrowings

Maturities of the obligations associated with our borrowing arrangements based on scheduled repayments at March 31, 2023 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	$	621,527	$	2,750	$	1,350	$	—	$	—	$	—	$	625,627
FHLB borrowings	330,717		748		775		391		411		141		333,183
Total obligations	$	952,244	$	3,498	$	2,125	$	391	$	411	$	141	$	958,810

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Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023		December 31, 2022
Subordinated notes: (1)
3.875% Subordinated notes, net of unamortized debt issuance costs (2)	$	98,710	$	98,674
Total Subordinated notes	98,710		98,674
Trust preferred subordinated debentures: (3)
Southside Statutory Trust III, net of unamortized debt issuance costs (4)	20,574		20,573
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	60,266		60,265
Total Long-term debt	$	158,976	$	158,939

(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 $1.3 million at March 31, 2023 and December 31, 2022.

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

(4)The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $45,000 at March 31, 2023 and $46,000 at December 31, 2022.

Schedule of Subordinated Borrowing

As of March 31, 2023, 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
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)	May 20, 2005	$	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, 2023

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,
	Retirement Plan				Acquired Retirement Plan				Restoration Plan
	2023		2022		2023		2022		2023		2022
Interest cost	$	925	$	680	$	32	$	26	$	206	$	139
Expected return on assets	(1,143)		(1,461)		(47)		(59)		—		—
Net loss amortization	166		151		—		—		7		55
Net periodic benefit cost (income)	$	(52)	$	(630)	$	(15)	$	(33)	$	213	$	194

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Derivative Financial Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023						December 31, 2022
			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	$	880,000	$	32,886	$	5,443	$	575,000	$	39,527	$	—
Swaps-Fair Value Hedge-Financial institution counterparties	742,675		13,035		3,246		742,675		21,733		171
Derivatives designated as non-hedging instruments
Interest rate contracts:
Swaps-Financial institution counterparties	220,999		16,018		—		223,124		21,046		—
Swaps-Customer counterparties	220,999		—		16,018		223,124		—		21,046
Gross derivatives			61,939		24,707				82,306		21,217
Offsetting derivative assets/liabilities			(8,689)		(8,689)				(171)		(171)
Cash collateral received/posted			(53,250)		—				(82,135)		—
Net derivatives included in the consolidated balance sheets (2)			$	—	$	16,018			$	—	$	21,046

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

(2)    Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at March 31, 2023 or December 31, 2022. 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 or overnight SOFR rates in effect at March 31, 2023 and December 31, 2022:

	March 31, 2023							December 31, 2022
			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	$	880,000	3.0	4.77	%	2.20	%	$	575,000	2.3	4.44	%	1.13	%
Swaps-Fair Value hedge
Financial institution counterparties	742,675		6.0	4.56	%	3.21	%	742,675		6.3	3.42	%	3.21	%
Swaps-Non-hedging
Financial institution counterparties	220,999		8.8	5.29	%	2.68	%	223,124		9.0	4.83	%	2.69	%
Customer counterparties	220,999		8.8	2.68	%	5.29	%	223,124		9.0	2.69	%	4.83	%

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Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2023

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, 2023	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	$	297,157	$	297,157	$	—	$	—
State and political subdivisions	886,472		—		886,472		—
Corporate bonds and other	13,411		—		13,411		—
MBS: (1)
Residential	229,736		—		229,736		—
Commercial	10,446		—		10,446		—
Equity investments:
Equity investments	5,319		5,319		—		—
Derivative assets:
Interest rate swaps	61,939		—		61,939		—
Total asset recurring fair value measurements	$	1,504,480	$	302,476	$	1,202,004	$	—
Derivative liabilities:
Interest rate swaps	$	24,707	$	—	$	24,707	$	—
Total liability recurring fair value measurements	$	24,707	$	—	$	24,707	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	11	$	—	$	—	$	11
Collateral-dependent loans (2)	7,857		—		—		7,857
Total asset nonrecurring fair value measurements	$	7,868	$	—	$	—	$	7,868

			Fair Value Measurements at the End of the Reporting Period Using
December 31, 2022	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	$	964,852	$	—	$	964,852	$	—
Corporate bonds and other	8,704		—		8,704		—
MBS: (1)
Residential	315,027		—		315,027		—
Commercial	10,431		—		10,431		—
Equity investments:
Equity investments	5,235		5,235		—		—
Derivative assets:
Interest rate swaps	82,306		—		82,306		—
Total asset recurring fair value measurements	$	1,386,555	$	5,235	$	1,381,320	$	—
Derivative liabilities:
Interest rate swaps	$	21,217	$	—	$	21,217	$	—
Total liability recurring fair value measurements	$	21,217	$	—	$	21,217	$	—
Nonrecurring fair value measurements
Foreclosed assets	$	167	$	—	$	—	$	167
Collateral-dependent loans (2)	7,815		—		—		7,815
Total asset nonrecurring fair value measurements	$	7,982	$	—	$	—	$	7,982

(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, 2023	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	310,492	$	310,492	$	310,492	$	—	$	—
Investment securities:
HTM, at carrying value	1,184,257		1,056,754		—		1,056,754		—
MBS:
HTM, at carrying value	124,200		115,820		—		115,820		—
FHLB stock, at cost	16,696		16,696		—		16,696		—
Equity investments	4,590		4,590		—		4,590		—
Loans, net of allowance for loan losses	4,116,312		3,861,859		—		—		3,861,859
Loans held for sale	407		407		—		407		—
Financial liabilities:
Deposits	$	5,838,220	$	5,807,050	$	—	$	5,807,050	$	—
Other borrowings	625,627		630,270		—		630,270		—
FHLB borrowings	333,183		321,144		—		321,144		—
Subordinated notes, net of unamortized debt issuance costs	98,710		89,952		—		89,952		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,266		54,520		—		54,520		—

			Estimated Fair Value
December 31, 2022	Carrying Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	199,252	$	199,252	$	199,252	$	—	$	—
Investment securities:
HTM, at carrying value	1,190,108		1,023,376		—		1,023,376		—
Mortgage-backed securities:
HTM, at carrying value	136,621		125,780		—		125,780		—
FHLB stock, at cost	9,190		9,190		—		9,190		—
Equity investments	5,946		5,946		—		5,946		—
Loans, net of allowance for loan losses	4,111,176		3,880,664		—		—		3,880,664
Loans held for sale	667		667		—		667		—
Financial liabilities:
Deposits	$	6,198,019	$	6,158,517	$	—	$	6,158,517	$	—
Other borrowings	221,153		221,153		—		221,153		—
FHLB borrowings	153,358		140,976		—		140,976		—
Subordinated notes, net of unamortized debt issuance costs	98,674		91,357		—		91,357		—
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,265		60,594		—		60,594		—

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Income Taxes Income Taxes (Tables)

3 Months Ended

Mar. 31, 2023

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,
	2023		2022
Current income tax expense	$	4,737	$	2,861
Deferred income tax expense (benefit)	(194)		285
Income tax expense	$	4,543	$	3,146

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

3 Months Ended

Mar. 31, 2023

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,
	2023		2022
Balance at beginning of period	$	3,687	$	2,384
Provision for (reversal of) off-balance-sheet credit exposures	(128)		28
Balance at end of period	$	3,559	$	2,412

Schedule of unused commitments

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

	March 31, 2023		December 31, 2022
Commitments to extend credit	$	1,274,326	$	1,296,773
Standby letters of credit	25,959		26,844
Total	$	1,300,285	$	1,323,617

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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic and Diluted Earnings:
Net income	$ 26,034	$ 24,996
Basic weighted-average shares outstanding (in shares)	31,372	32,357
Add: Stock awards (in shares)	92	180
Diluted weighted-average shares outstanding (in shares)	31,464	32,537
Basic earnings per share:
Earnings per common share - basic (in dollars per share)	$ 0.83	$ 0.77
Diluted earnings per share:
Earnings per common share - diluted (in dollars per share)	$ 0.83	$ 0.77
Number of antidilutive options (in shares)	121	0

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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	$ 745,997	$ 912,172
Income tax (expense) benefit	(1,102)	37,209
Ending balance, net of tax	751,030	784,241
Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(149,181)	84,716
Other comprehensive (loss) income before reclassifications	13,019	(201,045)
Reclassification adjustments included in net income	4,138	1,786
Income tax (expense) benefit	(3,603)	41,844
Net current-period other comprehensive income (loss), net of tax	13,554	(157,415)
Ending balance, net of tax	(135,627)	(72,699)
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	31,227	(1,257)
Other comprehensive (loss) income before reclassifications	(6,976)	20,546
Reclassification adjustments included in net income	(5,108)	1,322
Income tax (expense) benefit	2,537	(4,593)
Net current-period other comprehensive income (loss), net of tax	(9,547)	17,275
Ending balance, net of tax	21,680	16,018
Retirement Plans
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(19,502)	(23,754)
Other comprehensive (loss) income before reclassifications	0	0
Reclassification adjustments included in net income	173	206
Income tax (expense) benefit	(36)	(42)
Net current-period other comprehensive income (loss), net of tax	137	164
Ending balance, net of tax	(19,365)	(23,590)
Total
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(137,456)	59,705
Other comprehensive (loss) income before reclassifications	6,043	(180,499)
Reclassification adjustments included in net income	(797)	3,314
Income tax (expense) benefit	(1,102)	37,209
Net current-period other comprehensive income (loss), net of tax	4,144	(139,976)
Ending balance, net of tax	$ (133,312)	$ (80,271)

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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, 2023	Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized gains and losses		$ 1,992	$ 243
Tax benefit (expense)		(4,543)	(3,146)
Realized net gain (loss) on sale of securities		(2,146)	(1,543)
Total reclassifications for the period, net of tax		630	(2,619)
Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(4,138)	(1,786)
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		5,108	(1,322)
Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[1]	(173)	(206)
Amortization of pension plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(173)	(206)
Tax benefit		36	42
Total reclassifications for the period, net of tax		(137)	(164)
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]	(1,992)	(243)
Tax benefit (expense)		418	51
Net of tax		(1,574)	(192)
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)		451	324
Net of tax		(1,695)	(1,219)
Realized net gain (loss) on sale of securities	[3]	(2,146)	(1,543)
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)		(1,072)	278
Net of tax		4,036	(1,044)
Realized net (loss) gain on interest rate swap derivatives	[4]	$ 5,108	$ (1,322)

[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 (loss) on sale of securities AFS on the consolidated statements of income.

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

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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Amortized Cost		$ 1,499,135	$ 1,387,874
Gross unrealized gains		2,511	1,282
Gross unrealized losses		64,424	90,142
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		1,437,222	1,299,014
HELD TO MATURITY
Amortized cost		1,308,457	1,326,729
Gross unrealized gains		9,288	4,565
Gross unrealized losses		145,171	182,138
Estimated Fair Value		1,172,574	1,149,156
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		297,061
Gross unrealized gains		96
Gross unrealized losses		0
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		297,157
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		938,822	1,039,453
Gross unrealized gains		2,023	956
Gross unrealized losses		54,373	75,557
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		886,472	964,852
HELD TO MATURITY
Amortized cost		1,038,054	1,037,556
Gross unrealized gains		8,703	3,969
Gross unrealized losses		126,946	163,283
Estimated Fair Value		919,811	878,242
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,513	8,692
Gross unrealized gains		33	26
Gross unrealized losses		1,135	14
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		13,411	8,704
HELD TO MATURITY
Amortized cost		146,203	152,552
Gross unrealized gains		561	575
Gross unrealized losses		9,821	7,993
Estimated Fair Value		136,943	145,134
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	237,426	328,400
Gross unrealized gains	[1]	302	250
Gross unrealized losses	[1]	7,992	13,623
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[1]	229,736	315,027
HELD TO MATURITY
Amortized cost	[1]	93,399	93,796
Gross unrealized gains	[1]	24	21
Gross unrealized losses	[1]	6,282	8,343
Estimated Fair Value	[1]	87,141	85,474
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	11,313	11,329
Gross unrealized gains	[1]	57	50
Gross unrealized losses	[1]	924	948
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[1]	10,446	10,431
HELD TO MATURITY
Amortized cost	[1]	30,801	42,825
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	2,122	2,519
Estimated Fair Value	[1]	$ 28,679	$ 40,306

[1] All MBS are 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, 2023	Dec. 31, 2022
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 321,043	$ 1,174,855
Less than 12 Months, unrealized loss	7,217	82,638
More than 12 Months, fair value	697,645	29,165
More than 12 Months, unrealized Loss	57,207	7,504
Total fair value	1,018,688	1,204,020
Total unrealized loss	64,424	90,142
HELD TO MATURITY
Less than 12 months, fair value	298,906	672,739
Less than 12 months, unrealized loss	14,727	83,876
More than 12 months, fair value	675,086	340,055
More than 12 months, unrealized loss	130,444	98,262
Total fair value	973,992	1,012,794
Total unrealized loss	145,171	182,138
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	152,248	859,270
Less than 12 Months, unrealized loss	2,179	68,683
More than 12 Months, fair value	625,144	26,620
More than 12 Months, unrealized Loss	52,194	6,874
Total fair value	777,392	885,890
Total unrealized loss	54,373	75,557
HELD TO MATURITY
Less than 12 months, fair value	182,401	426,382
Less than 12 months, unrealized loss	7,385	66,898
More than 12 months, fair value	544,200	323,385
More than 12 months, unrealized loss	119,561	96,385
Total fair value	726,601	749,767
Total unrealized loss	126,946	163,283
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	13,193	3,678
Less than 12 Months, unrealized loss	1,135	14
More than 12 Months, fair value	0	0
More than 12 Months, unrealized Loss	0	0
Total fair value	13,193	3,678
Total unrealized loss	1,135	14
HELD TO MATURITY
Less than 12 months, fair value	95,612	125,250
Less than 12 months, unrealized loss	6,228	6,660
More than 12 months, fair value	36,668	12,738
More than 12 months, unrealized loss	3,593	1,333
Total fair value	132,280	137,988
Total unrealized loss	9,821	7,993
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	155,602	306,294
Less than 12 Months, unrealized loss	3,903	13,623
More than 12 Months, fair value	64,334	0
More than 12 Months, unrealized Loss	4,089	0
Total fair value	219,936	306,294
Total unrealized loss	7,992	13,623
HELD TO MATURITY
Less than 12 months, fair value	20,893	80,801
Less than 12 months, unrealized loss	1,114	7,799
More than 12 months, fair value	65,539	3,932
More than 12 months, unrealized loss	5,168	544
Total fair value	86,432	84,733
Total unrealized loss	6,282	8,343
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value	0	5,613
Less than 12 Months, unrealized loss	0	318
More than 12 Months, fair value	8,167	2,545
More than 12 Months, unrealized Loss	924	630
Total fair value	8,167	8,158
Total unrealized loss	924	948
HELD TO MATURITY
Less than 12 months, fair value	0	40,306
Less than 12 months, unrealized loss	0	2,519
More than 12 months, fair value	28,679	0
More than 12 months, unrealized loss	2,122	0
Total fair value	28,679	40,306
Total unrealized loss	$ 2,122	$ 2,519

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Securities - Interest Income on Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Investments, Debt Securities [Abstract]
US Treasury	$ 697	$ 168
State and political subdivisions	17,099	13,332
Corporate bonds and other	1,832	1,327
MBS	4,329	4,017
Total interest income on securities	$ 23,957	$ 18,844

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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, 2023	Dec. 31, 2022
Available for sale, Amortized Cost
Due in one year or less	$ 297,272
Due after one year through five years	1,563
Due after five years through ten years	33,196
Due after ten years	918,365
Total available-for-sale investment securities	1,250,396
MBS:	248,739
Amortized Cost	1,499,135	$ 1,387,874
Available for sale, Fair Value
Due in one year or less	297,367
Due after one year through five years	1,601
Due after five years through ten years	32,564
Due after ten years	865,508
Total available-for-sale investment securities	1,197,040
MBS:	240,182
Total	1,437,222	1,299,014
Held to maturity, Amortized Cost
Due in one year or less	125
Due after one year through five years	20,795
Due after five years through ten years	135,369
Due after ten years	1,027,968
Total held-to-maturity investment securities	1,184,257
Mortgage-backed securities	124,200
Amortized cost	1,308,457	1,326,729
Held to maturity, Fair Value
Due in one year or less	125
Due after one year through five years	20,037
Due after five years through ten years	126,811
Due after ten years	909,781
Total held-to-maturity investment securities	1,056,754
Mortgage-backed securities	115,820
Total	$ 1,172,574	$ 1,149,156

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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, 2023	Mar. 31, 2022
Investments, All Other Investments [Abstract]
Net gains (losses) recognized during the period on equity investments	$ 2,500	$ (275)
Less: Net gains recognized during the period on equity investments sold during the period	2,416	0
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date	$ 84	$ (275)

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Securities - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0		$ 0
Transferred Securities, Unrealized Loss, Before Tax	119,600,000		121,500,000
Securities transferred, Unrealized Loss, Net of Tax	94,500,000		96,000,000
Fair value of securities transferred from AFS to HTM	0		1,250,000,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Net gain (loss) on sale of securities AFS	2,146,000	$ 1,543,000
Gross realized gains on AFS securities	1,100,000	1,800,000
Gross realized losses on AFS securities	3,200,000	238,000
Equity investments	9,909,000		11,181,000
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Sale of HTM portfolio	0	0
Interest receivable	34,890,000		49,350,000
Debt Securities, Held-to-maturity, Nonaccrual	0		0
FHLB stock with other-than-temporary impairment	0
Other-than-temporarily impaired equity investments	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	515
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 310,492,000	187,107,000	199,252,000	$ 201,753,000
Less: Net gains recognized during the period on equity investments sold during the period	2,416,000	0
State and political subdivisions
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)	0	0
Corporate bonds and other
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)	0	$ 0
Asset Pledged as Collateral
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities	2,130,000,000		1,820,000,000
Financial Asset, Past Due
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Securities held to maturity (estimated fair value of $138,879)	0		0
Available-for-sale Securities
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Interest receivable	9,800,000		16,900,000
Held-to-maturity Securities
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Interest receivable	$ 8,400,000		$ 13,600,000

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Loans and Allowance for Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans	$ 4,152,644	$ 4,147,691
Less: Allowance for loan losses	36,332	36,515	$ 35,524	$ 35,273
Total loans	4,116,312	4,111,176
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	591,894	559,681
Less: Allowance for loan losses	3,152	3,164	3,604	3,787
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	672,595	663,519
Less: Allowance for loan losses	2,314	2,173	1,982	1,866
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	1,990,861	1,987,707
Less: Allowance for loan losses	28,721	28,701	27,225	26,980
Commercial loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	388,182	412,064
Less: Allowance for loan losses	1,901	2,235	2,454	2,397
Municipal loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	438,566	450,067
Less: Allowance for loan losses	44	45	48	47
Loans to individuals
Loans and Leases Receivable Disclosure [Abstract]
Loans	70,546	74,653
Less: Allowance for loan losses	$ 200	$ 197	$ 211	$ 196

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Loans and Allowance for Loan Losses - Loans by Credit Quality Indicator and Origination Year (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		$ 204,502		$ 1,262,330
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		1,220,808		1,055,361
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		1,013,974		422,026
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		404,396		290,975
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		260,363		128,067
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		707,241		630,012
Financing Receivable, Excluding Accrued Interest, Revolving		341,360		358,920
Loans		4,152,644		4,147,691
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	[1]	391
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff		108
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff		17
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff		16
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff		101
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff		0
Loans charged-off		633	$ 555
Construction Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		22,665		171,809
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		183,358		184,835
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		177,183		34,537
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		37,195		7,456
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		7,337		1,886
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		8,018		6,628
Financing Receivable, Excluding Accrued Interest, Revolving		156,138		152,530
Loans		591,894		559,681
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff		0
Loans charged-off		0	0
Construction Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		22,665		169,652
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		179,803		184,501
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		176,130		34,537
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		37,195		7,091
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		6,980		1,844
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		7,789		6,434
Financing Receivable, Excluding Accrued Interest, Revolving		141,330		152,530
Loans		571,892		556,589
Construction Real Estate Loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		299
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		2,434		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		14,808		0
Loans		17,242		299
Construction Real Estate Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		1,858
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		822		290
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		1,010		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		9		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		1,841		2,148
Construction Real Estate Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		10
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		42
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		229		194
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		229		246
Construction Real Estate Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		299		44
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		43		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		355
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		348		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		690		399
1-4 Family Residential Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		13,984		82,850
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		92,686		144,424
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		144,515		128,962
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		126,442		70,196
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		68,197		38,312
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		224,606		196,572
Financing Receivable, Excluding Accrued Interest, Revolving		2,165		2,203
Loans		672,595		663,519
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff		49
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff		0
Loans charged-off		49	0
1-4 Family Residential Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		13,984		82,847
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		92,684		144,424
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		144,451		128,666
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		126,154		70,142
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		68,073		36,710
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		220,774		194,490
Financing Receivable, Excluding Accrued Interest, Revolving		2,123		2,160
Loans		668,243		659,439
1-4 Family Residential Real Estate Loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		0		0
1-4 Family Residential Real Estate Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		79
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		78		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		1,397
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		1,381		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		1,459		1,476
1-4 Family Residential Real Estate Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		2		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		64		217
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		210		54
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		124		32
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		2,146		1,942
Financing Receivable, Excluding Accrued Interest, Revolving		42		43
Loans		2,588		2,291
1-4 Family Residential Real Estate Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		173
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		305		140
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		305		313
Commercial Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		137,028		798,653
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		754,591		556,157
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		532,897		170,720
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		158,414		151,449
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		126,759		55,855
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		270,992		242,558
Financing Receivable, Excluding Accrued Interest, Revolving		10,180		12,315
Loans		1,990,861		1,987,707
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff		0
Loans charged-off		0	0
Commercial Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		137,028		798,653
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		754,591		546,938
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		523,896		168,607
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		156,316		136,440
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		111,505		55,480
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		263,451		233,509
Financing Receivable, Excluding Accrued Interest, Revolving		10,180		12,315
Loans		1,956,967		1,951,942
Commercial Real Estate Loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		9,219
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		9,001		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		349		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		9,350		9,219
Commercial Real Estate Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		1,832
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		1,820		330
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		437		115
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		945		1,849
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		3,202		4,126
Commercial Real Estate Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		281
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		278		14,603
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		14,395		260
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,484		6,992
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		21,157		22,136
Commercial Real Estate Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		76
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		73		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		112		208
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		185		284
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		17,642		114,174
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		102,088		73,847
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		67,291		18,009
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		16,139		8,445
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		7,404		5,330
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		7,455		3,322
Financing Receivable, Excluding Accrued Interest, Revolving		170,163		188,937
Loans		388,182		412,064
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff		84
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff		11
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff		14
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff		0
Loans charged-off		109	131
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		17,642		113,678
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		101,347		68,509
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		61,883		17,852
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		16,062		8,249
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		7,209		4,820
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,968		3,313
Financing Receivable, Excluding Accrued Interest, Revolving		161,646		178,951
Loans		372,757		395,372
Commercial loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		208
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		73		13
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		149		56
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		199		0
Loans		421		277
Commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		183		5,109
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		4,996		31
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		27		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		288
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		269		0
Financing Receivable, Excluding Accrued Interest, Revolving		8,318		9,986
Loans		13,793		15,414
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		220
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		418		116
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		190		70
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		110
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		86		12
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		25		9
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		719		537
Commercial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		68
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		67		100
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		73		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		50		86
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		109		210
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		193		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		492		464
Municipal loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		5,679		65,258
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		63,464		74,617
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		73,606		57,147
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		55,338		48,144
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		46,425		24,979
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		194,054		179,922
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		438,566		450,067
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff		0
Loans charged-off		0	0
Municipal loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		5,679		65,258
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		63,464		74,617
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		73,606		57,147
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		55,338		47,636
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		45,918		24,576
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		187,652		173,919
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		431,657		443,153
Municipal loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		508
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		507		403
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,402		6,003
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		6,909		6,914
Municipal loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		0		0
Municipal loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		0		0
Municipal loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		0		0
Loans to individuals
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		7,504		29,586
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		24,621		21,481
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		18,482		12,651
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		10,868		5,285
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		4,241		1,705
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		2,116		1,010
Financing Receivable, Excluding Accrued Interest, Revolving		2,714		2,935
Loans		70,546		74,653
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	[1]	391
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff		24
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff		6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff		2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff		52
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff		0
Loans charged-off		475	$ 424
Loans to individuals | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		7,504		29,579
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		24,621		21,480
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		18,476		12,651
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		10,868		5,261
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		4,219		1,665
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		2,092		1,005
Financing Receivable, Excluding Accrued Interest, Revolving		2,704		2,935
Loans		70,484		74,576
Loans to individuals | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		10		0
Loans		10		0
Loans to individuals | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		0		0
Loans to individuals | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		5		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		4		2
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		9		9
Loans to individuals | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		6		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		18
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		17		40
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		20		3
Financing Receivable, Excluding Accrued Interest, Revolving		0		0
Loans		43		$ 68
Demand Deposit Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff		$ 391

[1] Includes $391,000 in charged off demand deposit overdrafts reported as 2023 originations.

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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, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans	$ 4,152,644	$ 4,147,691
Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	4,145,541	4,141,558
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,930	4,395
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	662	822
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	511	916
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	7,103	6,133
Construction Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	591,894	559,681
Construction Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	591,140	559,617
Construction Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	455	43
Construction Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	299	21
Construction Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	754	64
1-4 Family Residential Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	672,595	663,519
1-4 Family Residential Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	669,626	659,408
1-4 Family Residential Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,562	3,529
1-4 Family Residential Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	48	368
1-4 Family Residential Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	359	214
1-4 Family Residential Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,969	4,111
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	1,990,861	1,987,707
Commercial Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	1,990,059	1,987,034
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	763	105
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	153
Commercial Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	39	415
Commercial Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	802	673
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans	388,182	412,064
Commercial loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	385,844	411,025
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,929	515
Commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	315	277
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	94	247
Commercial loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,338	1,039
Municipal loans
Financing Receivable, Past Due [Line Items]
Loans	438,566	450,067
Municipal loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	438,566	450,067
Municipal loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Municipal loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Municipal loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Municipal loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Loans to individuals
Financing Receivable, Past Due [Line Items]
Loans	70,546	74,653
Loans to individuals | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	70,306	74,407
Loans to individuals | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	221	203
Loans to individuals | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	3
Loans to individuals | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	19	40
Loans to individuals | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	$ 240	$ 246

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Loans and Allowance for Loan Losses - Nonperforming Assets by Asset Class (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Extended Amortization Period
Nonperforming Assets [Line Items]
Restructured loans		$ 179		$ 897
Commercial loans | Extended Amortization Period
Nonperforming Assets [Line Items]
Restructured loans		179
Nonperforming Assets
Nonperforming Assets [Line Items]
Nonaccrual loans	[1]	3,169		2,846
Accruing loans past due more than 90 days		0		0
Restructured loans	[2]	0	$ 7,849
OREO		0		93
Repossessed assets		11		74
Total nonperforming assets		3,180		10,862
Nonperforming Assets | Construction Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		695		405
Nonperforming Assets | 1-4 Family Residential Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		933		848
Nonperforming Assets | Commercial Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		582		762
Nonperforming Assets | Commercial loans
Nonperforming Assets [Line Items]
Nonaccrual loans		911		757
Nonperforming Assets | Loans to individuals
Nonperforming Assets [Line Items]
Nonaccrual loans		$ 48		$ 74

[1] Includes $179,000 and $897,000 of restructured loans as of March 31, 2023 and December 31, 2022, respectively.

[2] Pursuant to our adoption of ASU 2022-02, effective January 1, 2023, we prospectively discontinued the recognition and measurement guidance previously required on troubled debt restructures. As a result, “restructured” loans as of March 31, 2023 exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures.

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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, 2023	Mar. 31, 2022
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	$ 36,515	$ 35,273
Loans charged-off	(633)	(555)
Recoveries of loans charged-off	362	540
Net loans (charged-off) recovered	(271)	(15)
Provision for (reversal of) loan losses	88	266
Balance at end of period	36,332	35,524
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	3,164	3,787
Loans charged-off	0	0
Recoveries of loans charged-off	1	0
Net loans (charged-off) recovered	1	0
Provision for (reversal of) loan losses	(13)	(183)
Balance at end of period	3,152	3,604
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,173	1,866
Loans charged-off	(49)	0
Recoveries of loans charged-off	5	39
Net loans (charged-off) recovered	(44)	39
Provision for (reversal of) loan losses	185	77
Balance at end of period	2,314	1,982
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	28,701	26,980
Loans charged-off	0	0
Recoveries of loans charged-off	0	47
Net loans (charged-off) recovered	0	47
Provision for (reversal of) loan losses	20	198
Balance at end of period	28,721	27,225
Commercial loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,235	2,397
Loans charged-off	(109)	(131)
Recoveries of loans charged-off	60	216
Net loans (charged-off) recovered	(49)	85
Provision for (reversal of) loan losses	(285)	(28)
Balance at end of period	1,901	2,454
Municipal loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	45	47
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	(1)	1
Balance at end of period	44	48
Loans to individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	197	196
Loans charged-off	(475)	(424)
Recoveries of loans charged-off	296	238
Net loans (charged-off) recovered	(179)	(186)
Provision for (reversal of) loan losses	182	201
Balance at end of period	$ 200	$ 211

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Loans and Allowance for Loan Losses - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Reversal of interest income on nonaccrual loans	$ 26	$ 12
Nonaccrual loans, no allowance	1,300		$ 1,600
Collateral-dependent loans	8,300		8,100
Mortgage Loans in Process of Foreclosure, Amount	0		0
Interest receivable	34,890		49,350
Accrued interest receivable on our loan portfolio	16,700		18,800
Extended Amortization Period
Financing Receivable, Allowance for Credit Loss [Line Items]
Restructured loans	$ 179		$ 897
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term	20 years
Owner and nonowner-occupied real estate	$ 1,650,000
Loans secured by multi-family properties	313,400
Loans secured by farmland	$ 25,900
Commercial loans | Extended Amortization Period
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loans modified	1
Restructured loans	$ 179
1-4 Family Residential Real Estate Loans | Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term	15 years
1-4 Family Residential Real Estate Loans | Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term	30 years

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Borrowing Arrangements (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Other borrowings		$ 625,627	$ 221,153
FHLB borrowings		333,183	153,358
Other borrowings:
Debt Instrument [Line Items]
Other borrowings		625,627	221,153
Average amount outstanding during the period	[1]	202,135	77,845
Maximum amount outstanding during the period	[2]	$ 625,627	$ 316,563
Weighted average interest rate during the period	[3]	4.90%	2.40%
Interest rate at end of the period	[4]	4.60%	4.10%
FHLB borrowings:
Debt Instrument [Line Items]
FHLB borrowings		$ 333,183	$ 153,358
Average amount outstanding during the period	[1]	404,199	135,926
Maximum amount outstanding during the period	[2]	$ 533,242	$ 423,645
Weighted average interest rate during the period	[3]	3.20%	2.40%
Interest rate at end of the period	[5]	5.20%	4.70%

[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 other borrowings and FHLB borrowings includes the effect of interest rate swaps.

[4] Stated rate.

[5] The interest rate on FHLB borrowings includes the effect of interest rate swaps.

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Borrowings Maturities Table (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Debt Instrument [Line Items]
Less than 1 Year	$ 952,244
1-2 Years	3,498
2-3 Years	2,125
3-4 Years	391
4-5 Years	411
Thereafter	141
Total	958,810
Other borrowings:
Debt Instrument [Line Items]
Less than 1 Year	621,527
1-2 Years	2,750
2-3 Years	1,350
3-4 Years	0
4-5 Years	0
Thereafter	0
Total	625,627
FHLB borrowings:
Debt Instrument [Line Items]
Less than 1 Year	330,717
1-2 Years	748
2-3 Years	775
3-4 Years	391
4-5 Years	411
Thereafter	141
Total	$ 333,183

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Borrowing Arrangements Narrative (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) credit_line oustanding_letters_of_credit	Dec. 31, 2022 USD ($)
Line of Credit Facility [Line Items]
Number of credit lines maintained by the Company | credit_line	3
Federal funds purchased	$ 0	$ 0
Letters of Credit, Federal Home Loan Bank, as collateral	$ 0
Maturity of repurchase agreements (less than)	3 years
Securities sold under repurchase agreements	$ 77,200,000	33,200,000
Federal Home Loan Bank borrowings, additional funding available	1,530,000,000
Frost Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	40,000,000
Line of credit, capacity available for issuance of letters of credit	$ 5,000,000
Number of outstanding letters of credit | oustanding_letters_of_credit	1
Letters of Credit Outstanding, Amount	$ 155,000
TIB - The Independent Bankers Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	15,000,000
Comerica Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	7,500,000
Federal Reserve Discount Window
Line of Credit Facility [Line Items]
Additional funding available	282,800,000
Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Additional funding available	$ 3,100,000
Minimum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	3.73%
Federal Home Loan Bank borrowings maturities	13 days
Maximum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	5.33%
Federal Home Loan Bank borrowings maturities	5 years 3 months 18 days
Federal Reserve Discount Window
Line of Credit Facility [Line Items]
Other borrowings	$ 350,000,000	$ 188,000,000
Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Other borrowings	$ 198,400,000

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Long-term Debt Other Long-term Debt (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023		Dec. 31, 2022		Nov. 06, 2020	Oct. 10, 2007	Aug. 10, 2007	Aug. 08, 2007	May 20, 2005	[4]	Sep. 04, 2003
Debt Instruments [Abstract]
Subordinated notes, net of unamortized debt issuance costs:	[1]	$ 98,710		$ 98,674
Trust preferred subordinated debentures	[2]	60,266		60,265
Total long-term debt		158,976		158,939
Southside Statutory Trust III, net of unamortized debt issuance costs
Debt Instruments [Abstract]
Trust preferred subordinated debentures		20,574	[2],[3]	20,573	[2],[3]							$ 20,619
Unamortized Debt Issuance Expense		45		46
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]		$ 3,600			$ 3,609
3.875% Subordinated Notes
Debt Instruments [Abstract]
Subordinated notes, net of unamortized debt issuance costs:	[1],[5]	98,710		98,674
Unamortized Debt Issuance Expense		$ 1,300		$ 1,300
Stated interest rate		3.875%				3.875%
Minimum
Debt Instruments [Abstract]
Subordinated notes, 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 debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $45,000 at March 31, 2023 and $46,000 at December 31, 2022.

[4] 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.

[5] The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.3 million at March 31, 2023 and December 31, 2022.

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Long-term Debt LT Debt Interest Rates (Details) - USD ($) $ in Thousands		Nov. 14, 2025	Aug. 10, 2007	Aug. 08, 2007	May 20, 2005		Sep. 04, 2003	Mar. 31, 2023		Dec. 31, 2022		Nov. 06, 2020	Oct. 10, 2007
Debt Instrument [Line Items]
Other long-term debt	[1]							$ 60,266		$ 60,265
Southside Statutory Trust III
Debt Instrument [Line Items]
Other long-term debt							$ 20,619	20,574	[1],[2]	20,573	[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]		$ 3,600
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]
Debt face amount												$ 100,000
Stated interest rate								3.875%				3.875%
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 $45,000 at March 31, 2023 and $46,000 at December 31, 2022.

[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, 2023	Mar. 31, 2022
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 925	$ 680
Expected return on assets	(1,143)	(1,461)
Net loss amortization	166	151
Net periodic benefit cost (income)	(52)	(630)
Retirement Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Interest cost	32	26
Expected return on assets	(47)	(59)
Net loss amortization	0	0
Net periodic benefit cost (income)	(15)	(33)
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	206	139
Expected return on assets	0	0
Net loss amortization	7	55
Net periodic benefit cost (income)	$ 213	$ 194

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Employee Benefit Plans Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Noncash adjustment to employee benefit plan liabilities, consisting of changes in net loss	$ 173	$ 206

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Derivative Financial Instruments and Hedging Activities - Schedule Of Derivative Instruments (Details) - USD ($)		Mar. 31, 2023	Dec. 31, 2022
Asset Derivative
Gross derivatives		$ 61,939,000	$ 82,306,000
Offsetting derivative assets		(8,689,000)	(171,000)
Cash collateral received/posted		(53,250,000)	(82,135,000)
Net derivatives included in the consolidated balance sheets	[1]	0	0
Liability Derivative
Gross derivatives		24,707,000	21,217,000
Offsetting derivative liabilities		(8,689,000)	(171,000)
Cash collateral received/posted		0	0
Net derivatives included in the consolidated balance sheets	[1]	16,018,000	21,046,000
Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		880,000,000
Financial Institution Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		0
Financial Institution Counterparties | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	880,000,000	575,000,000
Asset Derivative
Gross derivatives		32,886,000	39,527,000
Liability Derivative
Gross derivatives		5,443,000	0
Financial Institution Counterparties | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	742,675,000	742,675,000
Asset Derivative
Gross derivatives		13,035,000	21,733,000
Liability Derivative
Gross derivatives		3,246,000	171,000
Financial Institution Counterparties | Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	220,999,000	223,124,000
Asset Derivative
Gross derivatives		16,018,000	21,046,000
Liability Derivative
Gross derivatives		0	0
Customer Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		0
Customer Counterparties | Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	220,999,000	223,124,000
Asset Derivative
Gross derivatives		0	0
Liability Derivative
Gross derivatives		$ 16,018,000	$ 21,046,000

[1] Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at March 31, 2023 or December 31, 2022. 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 ($)		3 Months Ended	12 Months Ended
		Mar. 31, 2023	Dec. 31, 2022
Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		$ 880,000,000
Financial Institution Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 220,999,000	$ 223,124,000
Remaining Maturity		8 years 9 months 18 days	9 years
Weighted Average Receive Rate		5.29%	4.83%
Weighted Average Pay Rate		2.68%	2.69%
Financial Institution Counterparties | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 880,000,000	$ 575,000,000
Remaining Maturity		3 years	2 years 3 months 18 days
Weighted Average Receive Rate		4.77%	4.44%
Weighted Average Pay Rate		2.20%	1.13%
Financial Institution Counterparties | Fair Value Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 742,675,000	$ 742,675,000
Remaining Maturity		6 years	6 years 3 months 18 days
Weighted Average Receive Rate		4.56%	3.42%
Weighted Average Pay Rate		3.21%	3.21%
Customer Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 220,999,000	$ 223,124,000
Remaining Maturity		8 years 9 months 18 days	9 years
Weighted Average Receive Rate		2.68%	2.69%
Weighted Average Pay Rate		5.29%	4.83%

[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, 2023	Dec. 31, 2022
Derivative [Line Items]
Cash collateral received from counterparties under master netting agreements	$ 53,250,000	$ 82,135,000
Securities AFS , at estimated fair value	1,437,222,000	$ 1,299,014,000
Fair Value Hedging
Derivative [Line Items]
Securities AFS , at estimated fair value	759,700,000
Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount	$ 880,000,000

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Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		$ 1,437,222	$ 1,299,014
Derivative assets	[1]	0	0
Derivative liabilities	[1]	16,018	21,046
US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		297,157
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		886,472	964,852
Corporate bonds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		13,411	8,704
Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[2]	229,736	315,027
Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[2]	10,446	10,431
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments		5,319	5,235
Total asset fair value measurements		1,504,480	1,386,555
Total liability fair value measurements		24,707	21,217
Fair Value, Recurring | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		297,157
Fair Value, Recurring | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		886,472	964,852
Fair Value, Recurring | Corporate bonds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		13,411	8,704
Fair Value, Recurring | Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[3]	229,736	315,027
Fair Value, Recurring | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[3]	10,446	10,431
Fair Value, Recurring | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		61,939	82,306
Derivative liabilities		24,707	21,217
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		5,319	5,235
Total asset fair value measurements		302,476	5,235
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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		297,157
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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[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		1,202,004	1,381,320
Total liability fair value measurements		24,707	21,217
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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		886,472	964,852
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		13,411	8,704
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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[3]	229,736	315,027
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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[3]	10,446	10,431
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		61,939	82,306
Derivative liabilities		24,707	21,217
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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate bonds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[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 AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[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		11	167
Total asset fair value measurements		7,868	7,982
Fair Value, Nonrecurring | Collateral-dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	7,857	7,815
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		11	167
Total asset fair value measurements		7,868	7,982
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]	$ 7,857	$ 7,815

[1] Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at March 31, 2023 or December 31, 2022. 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 are 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, 2023	Dec. 31, 2022
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 310,492	$ 199,252
Investment securities:
HTM, at carrying value	1,184,257	1,190,108
Mortgage-backed securities:
HTM, at carrying value	124,200	136,621
FHLB stock, at cost	16,696	9,190
Equity investments	4,590	5,946
Loans, net of allowance for loan losses	4,116,312	4,111,176
Loans held for sale	407	667
Financial liabilities:
Deposits	5,838,220	6,198,019
Other borrowings	625,627	221,153
FHLB borrowings	333,183	153,358
Subordinated notes, net of unamortized debt issuance costs	98,710	98,674
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,266	60,265
Estimated Fair Value
Financial assets:
Cash and cash equivalents	310,492	199,252
Investment securities:
HTM, at carrying value	1,056,754	1,023,376
Mortgage-backed securities:
HTM, at carrying value	115,820	125,780
FHLB stock, at cost	16,696	9,190
Equity investments	4,590	5,946
Loans, net of allowance for loan losses	3,861,859	3,880,664
Loans held for sale	407	667
Financial liabilities:
Deposits	5,807,050	6,158,517
Other borrowings	630,270	221,153
FHLB borrowings	321,144	140,976
Subordinated notes, net of unamortized debt issuance costs	89,952	91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs	54,520	60,594
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	310,492	199,252
Investment securities:
HTM, at carrying value	0	0
Mortgage-backed securities:
HTM, at carrying value	0	0
FHLB stock, at cost	0	0
Equity investments	0	0
Loans, net of allowance for loan losses	0	0
Loans held for sale	0	0
Financial liabilities:
Deposits	0	0
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	1,056,754	1,023,376
Mortgage-backed securities:
HTM, at carrying value	115,820	125,780
FHLB stock, at cost	16,696	9,190
Equity investments	4,590	5,946
Loans, net of allowance for loan losses	0	0
Loans held for sale	407	667
Financial liabilities:
Deposits	5,807,050	6,158,517
Other borrowings	630,270	221,153
FHLB borrowings	321,144	140,976
Subordinated notes, net of unamortized debt issuance costs	89,952	91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs	54,520	60,594
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
FHLB stock, at cost	0	0
Equity investments	0	0
Loans, net of allowance for loan losses	3,861,859	3,880,664
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, 2023 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, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Current income tax expense	$ 4,737	$ 2,861
Deferred income tax expense (benefit)	(194)	285
Income tax expense	$ 4,543	$ 3,146

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Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Deferred tax assets, net	$ 33,800,000		$ 34,700,000
Deferred tax assets, valuation allowance	0		$ 0
Income tax expense	$ 4,543,000	$ 3,146,000
Effective income tax rate, percent	14.90%	11.20%

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Off-Balance-Sheet Arrangements, Allowance for off-balance-sheet credit exposures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 3,687	$ 2,384
Provision for (reversal of) off-balance-sheet credit exposures	(128)	28
Balance at end of period	$ 3,559	$ 2,412

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Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 1,300,285	$ 1,323,617
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	1,274,326	1,296,773
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 25,959	$ 26,844

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Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 192,000	$ 0
Operating lease ROU assets	15,183,000		$ 15,314,000
Unsettled trades to purchase securities	0	2,053,000	0
Unsettled trades to sell securities	4,044,000	$ 47,019,000	0
Unsettled Issuances of Brokered CDs	$ 0		$ 0