Southside Bancshares (SBSI) 10-Q 28 Jul 23 2023 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2023	Jul. 25, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 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		30,531,805
Entity Central Index Key	0000705432
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)		Jun. 30, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks		$ 114,707,000	$ 106,143,000
Interest earning deposits		14,059,000	9,276,000
Federal funds sold		78,347,000	83,833,000
Total cash and cash equivalents		207,113,000	199,252,000
Securities AFS, at estimated fair value (amortized cost of $1,409,568 and $1,387,874, respectively)		1,339,821,000	1,299,014,000
Securities HTM (estimated fair value of $1,148,815 and $1,149,156, respectively)		1,308,472,000	1,326,729,000
FHLB stock, at cost		10,801,000	9,190,000
Equity investments		9,572,000	11,181,000
Loans held for sale		1,666,000	667,000
Loans:
Loans		4,329,043,000	4,147,691,000
Less: Allowance for loan losses		(36,303,000)	(36,515,000)
Net loans		4,292,740,000	4,111,176,000
Premises and equipment, net		139,801,000	141,256,000
Operating lease ROU assets		15,273,000	15,314,000
Goodwill		201,116,000	201,116,000
Other intangible assets, net		3,702,000	4,622,000
Interest receivable		48,265,000	49,350,000
Deferred tax asset, net		29,226,000	34,695,000
Unsettled trades to sell securities		31,548,000	0
BOLI		134,951,000	133,911,000
Other assets		33,185,000	21,163,000
Total assets		7,807,252,000	7,558,636,000
Deposits:
Noninterest bearing		1,466,756,000	1,671,562,000
Interest bearing		4,650,931,000	4,526,457,000
Total deposits		6,117,687,000	6,198,019,000
Other borrowings		500,341,000	221,153,000
FHLB borrowings		183,007,000	153,358,000
Subordinated notes, net of unamortized debt issuance costs	[1]	93,796,000	98,674,000
Trust preferred subordinated debentures, net of unamortized debt issuance costs		60,267,000	60,265,000
Operating lease liabilities		17,103,000	17,070,000
Other liabilities		69,890,000	64,100,000
Total liabilities		7,042,091,000	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, 38,019,238 shares issued at June 30, 2023 and 38,000,822 shares issued at December 31, 2022)		47,524,000	47,501,000
Paid-in capital		787,027,000	784,545,000
Retained earnings		268,643,000	239,610,000
Treasury stock: (shares at cost, 7,487,433 at June 30, 2023 and 6,454,192 at December 31, 2022)		(222,340,000)	(188,203,000)
AOCI		(115,693,000)	(137,456,000)
Total shareholders’ equity		765,161,000	745,997,000
Total liabilities and shareholders’ equity		$ 7,807,252,000	$ 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.

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Securities AFS, at estimated fair value	$ 1,409,568	$ 1,387,874
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held-to-maturity, fair value	$ 1,148,815	$ 1,149,156
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	80,000,000	80,000,000
Common stock, shares issued (in shares)	38,019,238	38,000,822
Shares purchased (in shares)	7,487,433	6,454,192

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income:
Loans	$ 58,684	$ 38,344	$ 113,460	$ 73,232
Taxable investment securities	8,773	4,632	14,485	9,240
Tax-exempt investment securities	13,720	10,605	27,636	20,824
MBS	3,830	3,238	8,159	7,255
FHLB stock and equity investments	379	77	624	190
Other interest earning assets	1,490	204	3,360	232
Total interest income	86,876	57,100	167,724	110,973
Interest expense:
Deposits	21,679	4,264	41,585	7,501
FHLB borrowings	1,032	224	4,173	590
Subordinated notes	994	1,000	1,993	1,998
Trust preferred subordinated debentures	1,100	471	2,131	827
Other borrowings	8,155	63	10,573	73
Total interest expense	32,960	6,022	60,455	10,989
Net interest income	53,916	51,078	107,269	99,984
Provision for (reversal of) credit losses	(74)	(633)	(114)	(339)
Net interest income after provision for credit losses	53,990	51,711	107,383	100,323
Noninterest income:
Deposit services	6,291	6,496	12,713	13,124
Net gain (loss) on sale of securities AFS	(3,455)	(2,177)	(5,601)	(3,720)
Net gain on sale of equity securities	2,642	0	5,058	0
Gain on sale of loans	185	208	289	386
Trust fees	1,490	1,520	2,957	3,014
BOLI	756	720	2,431	1,411
Brokerage services	904	1,098	1,601	1,907
Other	1,651	1,232	3,049	3,700
Total noninterest income	10,464	9,097	22,497	19,822
Noninterest expense:
Salaries and employee benefits	21,376	20,329	43,232	40,298
Net occupancy	3,690	3,654	7,424	7,310
Advertising, travel & entertainment	854	716	1,904	1,453
ATM expense	320	356	675	637
Professional fees	1,192	1,147	2,564	2,074
Software and data processing	2,264	1,739	4,319	3,370
Communications	348	509	675	1,012
FDIC insurance	1,220	477	1,764	949
Amortization of intangibles	442	586	920	1,208
Other	3,287	2,593	6,365	4,990
Total noninterest expense	34,993	32,106	69,842	63,301
Income before income tax expense	29,461	28,702	60,038	56,844
Income tax expense	4,568	3,297	9,111	6,443
Net income	$ 24,893	$ 25,405	$ 50,927	$ 50,401
Earnings per common share - basic (in dollars per share)	$ 0.81	$ 0.79	$ 1.64	$ 1.56
Earnings per common share - diluted (in dollars per share)	0.81	0.79	1.64	1.56
Cash dividends paid per common share (in dollars per share)	$ 0.35	$ 0.34	$ 0.70	$ 0.68

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 24,893	$ 25,405	$ 50,927	$ 50,401
Securities AFS and transferred securities:
Change in unrealized holding gain (loss) on AFS securities during the period	6,831	(33,523)	19,850	(195,424)
Change in net unrealized loss on securities transferred from AFS to HTM	0	(52,360)	0	(91,504)
Reclassification adjustment for amortization related to AFS and HTM debt securities	1,989	1,310	3,981	1,553
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income	3,455	2,177	5,601	3,720
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	15,876	7,047	8,900	27,593
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges	(6,054)	344	(11,162)	1,666
Pension plans:
Amortization of net actuarial loss, included in net periodic benefit cost	205	241	378	447
Other comprehensive income (loss), before tax	22,302	(74,764)	27,548	(251,949)
Income tax (expense) benefit related to items of other comprehensive income (loss)	(4,683)	15,700	(5,785)	52,909
Other comprehensive income (loss), net of tax	17,619	(59,064)	21,763	(199,040)
Comprehensive income (loss)	$ 42,512	$ (33,659)	$ 72,690	$ (148,639)

CONSOLIDATED STATEMENTS OF CHAN

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, 2021	912,172	47,461	780,501	179,813	(155,308)	59,705
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	50,401
Other comprehensive income (loss)	(199,040)
Ending balance, net of tax at Jun. 30, 2022	731,782	47,481	782,511	208,171	(167,046)	(139,335)
Beginning balance, net of tax at Mar. 31, 2022	784,241	47,471	781,814	193,739	(158,512)	(80,271)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,405			25,405
Other comprehensive income (loss)	(59,064)					(59,064)
Issuance of common stock for dividend reinvestment plan	313	10	303
Purchase of common stock	(8,842)				(8,842)
Stock compensation expense	847		847
Net issuance of common stock under employee stock plans	(212)		(453)	(67)	308
Cash dividends paid on common stock	(10,906)			(10,906)
Ending balance, net of tax at Jun. 30, 2022	731,782	47,481	782,511	208,171	(167,046)	(139,335)
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)
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	50,927
Other comprehensive income (loss)	21,763
Ending balance, net of tax at Jun. 30, 2023	765,161	47,524	787,027	268,643	(222,340)	(115,693)
Beginning balance, net of tax at Mar. 31, 2023	751,030	47,511	786,119	254,565	(203,853)	(133,312)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,893			24,893
Other comprehensive income (loss)	17,619					17,619
Issuance of common stock for dividend reinvestment plan	299	13	286
Purchase of common stock	(18,725)				(18,725)
Stock compensation expense	924		924
Net issuance of common stock under employee stock plans	(159)		(302)	(95)	238
Cash dividends paid on common stock	(10,720)			(10,720)
Ending balance, net of tax at Jun. 30, 2023	$ 765,161	$ 47,524	$ 787,027	$ 268,643	$ (222,340)	$ (115,693)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for dividend reinvestment plan (in shares)	10,390	8,026	7,717	7,671
Common stock purchased (in shares)	618,831	457,394	223,901	82,285
Net issuance of common stock under employee stock plans (in shares)	19,065	23,919	30,162	16,551
Cash dividends paid on common stock (in dollars per share)	$ 0.35	$ 0.35	$ 0.34	$ 0.34

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
OPERATING ACTIVITIES:
Net income	$ 50,927,000	$ 50,401,000
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	5,289,000	5,561,000
Securities premium amortization (discount accretion), net	3,698,000	9,346,000
Loan (discount accretion) premium amortization, net	187,000	(323,000)
Provision for (reversal of) credit losses	(114,000)	(339,000)
Stock compensation expense	1,838,000	1,666,000
Deferred tax expense (benefit)	(316,000)	643,000
Net (gain) loss on sale of AFS securities	5,601,000	3,720,000
Net (gain) loss on sale of equity securities	(5,058,000)	0
Loss on impairment of investments	0	38,000
Net loss on premises and equipment	88,000	433,000
Gross proceeds from sales of loans held for sale	9,025,000	15,835,000
Gross originations of loans held for sale	(10,024,000)	(14,966,000)
Net (gain) loss on OREO	(53,000)	(12,000)
Gain on purchase of subordinated notes	(587,000)	0
Net change in:
Interest receivable	1,085,000	(2,394,000)
Other assets	74,402,000	(3,472,000)
Interest payable	4,962,000	(346,000)
Other liabilities	(82,917,000)	62,242,000
Net cash provided by (used in) operating activities	58,033,000	128,033,000
Securities AFS:
Purchases	(717,315,000)	(523,339,000)
Sales	642,230,000	264,792,000
Maturities, calls and principal repayments	15,069,000	78,779,000
Securities HTM:
Maturities, calls and principal repayments	19,705,000	6,097,000
Proceeds from sales of equity securities	6,679,000	0
Proceeds from redemption of FHLB stock and equity investments	27,525,000	11,041,000
Purchases of FHLB stock and equity investments	(29,148,000)	(9,833,000)
Net loan paydowns (originations)	(182,187,000)	(317,731,000)
Purchases of premises and equipment	(3,195,000)	(4,965,000)
Proceeds from BOLI	951,000	0
Proceeds from sales of premises and equipment	370,000	7,000
Net proceeds from sales of OREO	146,000	34,000
Proceeds from sales of repossessed assets	102,000	47,000
Net cash provided by (used in) investing activities	(219,068,000)	(495,071,000)
FINANCING ACTIVITIES:
Net change in deposits	(80,402,000)	526,069,000
Net change in other borrowings	279,188,000	35,259,000
Proceeds from FHLB borrowings	1,328,000,000	1,050,000,000
Repayment of FHLB borrowings	(1,298,351,000)	(1,240,337,000)
Purchase of subordinated notes	(4,365,000)	0
Proceeds from stock option exercises	640,000	409,000
Cash paid to tax authority related to tax withholding on share-based awards	(227,000)	(352,000)
Purchase of common stock	(34,480,000)	(12,200,000)
Proceeds from the issuance of common stock for dividend reinvestment plan	601,000	635,000
Cash dividends paid	(21,708,000)	(21,909,000)
Net cash provided by (used in) financing activities	168,896,000	337,574,000
Net increase (decrease) in cash and cash equivalents	7,861,000	(29,464,000)
Cash and cash equivalents at beginning of period	199,252,000	201,753,000
Cash and cash equivalents at end of period	207,113,000	172,289,000
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	55,493,000	11,334,000
Income taxes paid	8,000,000	5,200,000
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	61,000	197,000
Transfer of AFS to HTM securities	0	1,089,978,000
Unsettled trades to purchase securities	0	(174,038,000)
Unsettled trades to sell securities	$ 31,548,000	$ 72,001,000

Summary of Significant Accounti

Summary of Significant Accounting and Reporting Policies	6 Months Ended
	Jun. 30, 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. Our 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

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 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 Six Months Ended 2023 2022 2023 2022 Basic and Diluted Earnings: Net income $ 24,893 $ 25,405 $ 50,927 $ 50,401 Basic weighted-average shares outstanding 30,721 32,119 31,045 32,237 Add: Stock awards 33 132 54 157 Diluted weighted-average shares outstanding 30,754 32,251 31,099 32,394 Basic earnings per share: Net income $ 0.81 $ 0.79 $ 1.64 $ 1.56 Diluted earnings per share: Net income $ 0.81 $ 0.79 $ 1.64 $ 1.56 For the three and six months ended June 30, 2023, there were approximately 686,000 and 578,000 anti-dilutive shares, respectively. For the three and six months ended June 30, 2022, there were 18,000 and 1,000 anti-dilutive shares, respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 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 June 30, 2023 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (135,627) $ 21,680 $ (19,365) $ (133,312) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications 6,831 15,876 — 22,707 Reclassification adjustments included in net income 5,444 (6,054) 205 (405) Income tax (expense) benefit (2,577) (2,063) (43) (4,683) Net current-period other comprehensive income (loss), net of tax 9,698 7,759 162 17,619 Ending balance, net of tax $ (125,929) $ 29,439 $ (19,203) $ (115,693) Six Months Ended June 30, 2023 Retirement Plans 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 (loss) income before reclassifications 19,850 8,900 — 28,750 Reclassification adjustments included in net income 9,582 (11,162) 378 (1,202) Income tax (expense) benefit (6,180) 474 (79) (5,785) Net current-period other comprehensive income (loss), net of tax 23,252 (1,788) 299 21,763 Ending balance, net of tax $ (125,929) $ 29,439 $ (19,203) $ (115,693) Three Months Ended June 30, 2022 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (72,699) $ 16,018 $ (23,590) $ (80,271) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications (85,883) 7,047 — (78,836) Reclassification adjustments included in net income 3,487 344 241 4,072 Income tax (expense) benefit 17,303 (1,552) (51) 15,700 Net current-period other comprehensive income (loss), net of tax (65,093) 5,839 190 (59,064) Ending balance, net of tax $ (137,792) $ 21,857 $ (23,400) $ (139,335) Six Months Ended June 30, 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 (286,928) 27,593 — (259,335) Reclassification adjustments included in net income 5,273 1,666 447 7,386 Income tax (expense) benefit 59,147 (6,145) (93) 52,909 Net current-period other comprehensive income (loss), net of tax (222,508) 23,114 354 (199,040) Ending balance, net of tax $ (137,792) $ 21,857 $ (23,400) $ (139,335) The reclassification adjustments out of accumulated other comprehensive income (loss) included in net income are presented below (in thousands): Three Months Ended Six Months Ended 2023 2022 2023 2022 Unrealized gains and losses on securities transferred: Amortization of unrealized gains and losses (1) $ (1,989) $ (1,310) $ (3,981) $ (1,553) Tax benefit 418 275 836 326 Net of tax (1,571) (1,035) (3,145) (1,227) Unrealized gains and losses on available for sale securities: Realized net gain (loss) on sale of securities (2) (3,455) (2,177) (5,601) (3,720) Tax (expense) benefit 725 457 1,176 781 Net of tax (2,730) (1,720) (4,425) (2,939) Derivatives: Realized net gain (loss) on interest rate swap derivatives (3) 6,054 (344) 11,162 (1,666) Tax benefit (1,272) 72 (2,344) 350 Net of tax 4,782 (272) 8,818 (1,316) Amortization of pension plan: Net actuarial loss (4) (205) (241) (378) (447) Tax benefit 43 51 79 93 Net of tax (162) (190) (299) (354) Total reclassifications for the period, net of tax $ 319 $ (3,217) $ 949 $ (5,836) (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.”

Securities

Securities	6 Months Ended
	Jun. 30, 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 June 30, 2023 and December 31, 2022 are reflected in the tables below (in thousands): June 30, 2023 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 298,907 $ 91 $ — $ 298,998 State and political subdivisions 826,193 750 56,660 770,283 Corporate bonds and other 14,532 18 1,559 12,991 MBS: (1) Residential 258,683 171 11,621 247,233 Commercial 11,253 47 984 10,316 Total $ 1,409,568 $ 1,077 $ 70,824 $ 1,339,821 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,038,551 $ 7,093 $ 139,616 $ 906,028 Corporate bonds and other 146,371 421 16,895 129,897 MBS: (1) Residential 92,920 9 8,225 84,704 Commercial 30,630 — 2,444 28,186 Total $ 1,308,472 $ 7,523 $ 167,180 $ 1,148,815 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 did not transfer any securities from AFS to HTM during the six months ended June 30, 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 $117.6 million ($92.9 million, net of tax) at June 30, 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 $2.24 billion and $1.82 billion were pledged as of June 30, 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 June 30, 2023 and December 31, 2022, segregated by major security type and length of time in a continuous loss position (in thousands): June 30, 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 $ 116,217 $ 1,862 $ 602,120 $ 54,798 $ 718,337 $ 56,660 Corporate bonds and other 12,786 1,559 — — 12,786 1,559 MBS: Residential 169,577 6,585 61,126 5,036 230,703 11,621 Commercial — — 8,047 984 8,047 984 Total $ 298,580 $ 10,006 $ 671,293 $ 60,818 $ 969,873 $ 70,824 HELD TO MATURITY Investment securities: State and political subdivisions $ 140,247 $ 7,452 $ 606,783 $ 132,164 $ 747,030 $ 139,616 Corporate bonds and other 29,119 4,522 98,082 12,373 127,201 16,895 MBS: Residential 18,021 1,267 66,019 6,958 84,040 8,225 Commercial — — 28,186 2,444 28,186 2,444 Total $ 187,387 $ 13,241 $ 799,070 $ 153,939 $ 986,457 $ 167,180 December 31, 2022 Less Than 12 Months More Than 12 Months Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized 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 (i) where management 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 June 30, 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 June 30, 2023, we had 524 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 and six months ended June 30, 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 June 30, 2023, accrued interest receivable on AFS and HTM debt securities totaled $16.3 million and $13.4 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 June 30, 2023 or December 31, 2022. The following table reflects interest income recognized on securities for the periods presented (in thousands): Three Months Ended 2023 2022 U.S. Treasury $ 3,826 $ 59 State and political subdivisions 16,901 13,788 Corporate bonds and other 1,766 1,390 MBS 3,830 3,238 Total interest income on securities $ 26,323 $ 18,475 Six Months Ended 2023 2022 U.S. Treasury $ 4,523 $ 227 State and political subdivisions 34,000 27,120 Corporate bonds and other 3,598 2,717 MBS 8,159 7,255 Total interest income on securities $ 50,280 $ 37,319 There was a $5.6 million net realized loss as a result of sales from the AFS securities portfolio for the six months ended June 30, 2023, which consisted of $7.0 million in realized losses and $1.4 million in realized gains. There was a $3.7 million net realized loss as a result of sales from the AFS securities portfolio for the six months ended June 30, 2022, which consisted of $4.0 million in realized losses and $290,000 in realized gains. There were no sales from the HTM portfolio during the three and six months ended June 30, 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 June 30, 2023, are presented below by contractual maturity (in thousands): June 30, 2023 Amortized Cost Fair Value AVAILABLE FOR SALE Investment securities: Due in one year or less $ 299,118 $ 299,208 Due after one year through five years 1,564 1,591 Due after five years through ten years 32,280 30,881 Due after ten years 806,670 750,592 1,139,632 1,082,272 MBS: 269,936 257,549 Total $ 1,409,568 $ 1,339,821 June 30, 2023 Amortized Cost Fair Value HELD TO MATURITY Investment securities: Due in one year or less $ 125 $ 124 Due after one year through five years 20,809 20,016 Due after five years through ten years 136,422 120,546 Due after ten years 1,027,566 895,239 1,184,922 1,035,925 MBS: 123,550 112,890 Total $ 1,308,472 $ 1,148,815 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 June 30, 2023 and December 31, 2022, we had equity investments recorded in our consolidated balance sheets of $9.6 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 and six months ended June 30, 2023, there was a net gain on the sale of equity securities of $2.6 million and $5.1 million, respectively. 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 Six Months Ended 2023 2022 2023 2022 Net gains (losses) recognized during the period on equity investments $ 2,558 $ (191) $ 5,058 $ (466) Less: Net gains recognized during the period on equity investments sold during the period 2,642 — 5,058 — Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date $ (84) $ (191) $ — $ (466) 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 June 30, 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 June 30, 2023, our FHLB stock was not impaired and thus was not considered to be other-than-temporarily impaired.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	6 Months Ended
	Jun. 30, 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): June 30, 2023 December 31, 2022 Real estate loans: Construction $ 657,354 $ 559,681 1-4 family residential 684,878 663,519 Commercial 2,100,338 1,987,707 Commercial loans 383,724 412,064 Municipal loans 435,211 450,067 Loans to individuals 67,538 74,653 Total loans 4,329,043 4,147,691 Less: Allowance for loan losses 36,303 36,515 Net loans $ 4,292,740 $ 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 June 30, 2023 consisted of $1.73 billion of owner and non-owner occupied real estate, $338.1 million of loans secured by multi-family properties and $27.8 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): June 30, 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 $ 67,993 $ 190,372 $ 177,651 $ 31,227 $ 4,291 $ 6,267 $ 159,462 $ 637,263 Pass watch — 2,444 1,557 — — — 14,785 18,786 Special mention 161 395 — — 9 — — 565 Substandard — — 136 — — 225 — 361 Doubtful — — 42 — 337 — — 379 Total construction real estate $ 68,154 $ 193,211 $ 179,386 $ 31,227 $ 4,637 $ 6,492 $ 174,247 $ 657,354 Current period gross charge-offs $ — $ 63 $ — $ — $ — $ — $ — $ 63 1-4 family residential real estate: Pass $ 25,409 $ 105,843 $ 144,970 $ 122,025 $ 66,539 $ 212,648 $ 2,205 $ 679,639 Pass watch — — — 1,099 — 1,364 — 2,463 Special mention — — 63 206 123 2,150 — 2,542 Substandard — — — — — 234 — 234 Doubtful — — — — — — — — Total 1-4 family residential real estate $ 25,409 $ 105,843 $ 145,033 $ 123,330 $ 66,662 $ 216,396 $ 2,205 $ 684,878 Current period gross charge-offs $ — $ — $ — $ — $ — $ 71 $ — $ 71 Commercial real estate: Pass $ 268,423 $ 756,424 $ 524,837 $ 152,119 $ 98,968 $ 224,529 $ 15,889 $ 2,041,189 Pass watch 15,690 — 265 — 7,964 11,563 — 35,482 Special mention 2,019 — — — 223 188 — 2,430 Substandard — — 100 274 14,304 6,386 — 21,064 Doubtful — — — — 72 101 — 173 Total commercial real estate $ 286,132 $ 756,424 $ 525,202 $ 152,393 $ 121,531 $ 242,767 $ 15,889 $ 2,100,338 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial loans: Pass $ 36,239 $ 88,384 $ 57,919 $ 14,309 $ 5,897 $ 5,441 $ 161,472 $ 369,661 Pass watch 26 193 134 — — — 200 553 Special mention — 180 4,890 23 — 249 6,709 12,051 Substandard 168 395 87 — 61 8 20 739 Doubtful — 328 164 — 75 153 — 720 Total commercial loans $ 36,433 $ 89,480 $ 63,194 $ 14,332 $ 6,033 $ 5,851 $ 168,401 $ 383,724 Current period gross charge-offs $ — $ 290 $ 29 $ 22 $ 23 $ 5 $ — $ 369 Municipal loans: Pass $ 11,835 $ 62,834 $ 72,572 $ 52,677 $ 44,579 $ 190,714 $ — $ 435,211 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 11,835 $ 62,834 $ 72,572 $ 52,677 $ 44,579 $ 190,714 $ — $ 435,211 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 14,071 $ 21,029 $ 15,872 $ 9,246 $ 3,284 $ 1,410 $ 2,582 $ 67,494 Pass watch — — — — — 1 — 1 Special mention — — — — — — — — Substandard — — 17 — 20 — — 37 Doubtful — — 6 — — — — 6 Total loans to individuals $ 14,071 $ 21,029 $ 15,895 $ 9,246 $ 3,304 $ 1,411 $ 2,582 $ 67,538 Current period gross charge-offs (1) $ 729 $ 31 $ 22 $ 6 $ 2 $ 77 $ — $ 867 Total loans $ 442,034 $ 1,228,821 $ 1,001,282 $ 383,205 $ 246,746 $ 663,631 $ 363,324 $ 4,329,043 Total current period gross charge-offs (1) $ 729 $ 384 $ 51 $ 28 $ 25 $ 153 $ — $ 1,370 (1) Includes $729,000 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 June 30, 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): June 30, 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 $ 122 $ 6 $ 136 $ 264 $ 657,090 $ 657,354 1-4 family residential 1,406 1,371 585 3,362 681,516 684,878 Commercial 708 143 38 889 2,099,449 2,100,338 Commercial loans 593 416 103 1,112 382,612 383,724 Municipal loans — — — — 435,211 435,211 Loans to individuals 387 19 — 406 67,132 67,538 Total $ 3,216 $ 1,955 $ 862 $ 6,033 $ 4,323,010 $ 4,329,043 December 31, 2022 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days 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): June 30, 2023 December 31, 2022 Nonaccrual loans: Real estate loans: Construction $ 521 $ 405 1-4 family residential 1,005 848 Commercial 554 762 Commercial loans 930 757 Loans to individuals 7 74 Total nonaccrual loans (1) 3,017 2,846 Accruing loans past due more than 90 days — — Restructured loans (2) — 7,849 OREO — 93 Repossessed assets 42 74 Total nonperforming assets $ 3,059 $ 10,862 (1) Includes $314,000 and $897,000 of restructured loans as of June 30, 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 $11,000 and $30,000 of interest income on nonaccrual loans during the three and six months ended June 30, 2023, and $24,000 and $35,000 for the three and six months ended June 30, 2022. We had $1.2 million and $1.6 million of loans on nonaccrual for which there was no related allowance for credit losses as of June 30, 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 June 30, 2023 and December 31, 2022, we had $7.9 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 $54,000 loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of June 30, 2023. There were no loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of December 31, 2022. 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 six months ended June 30, 2023 were not significant. There were two commercial loans totaling $314,000 that were restructured with an extension of amortization period as of June 30, 2023 and are 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 June 30, 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 June 30, 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 June 30, 2023 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,152 $ 2,314 $ 28,721 $ 1,901 $ 44 $ 200 $ 36,332 Loans charged-off (63) (22) — (260) — (392) (737) Recoveries of loans charged-off — 41 1 143 — 245 430 Net loans (charged-off) recovered (63) 19 1 (117) — (147) (307) Provision for (reversal of) loan losses 306 327 (710) 233 (7) 129 278 Balance at end of period $ 3,395 $ 2,660 $ 28,012 $ 2,017 $ 37 $ 182 $ 36,303 Six Months Ended June 30, 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 (63) (71) — (369) — (867) (1,370) Recoveries of loans charged-off 1 46 1 203 — 541 792 Net loans (charged-off) recovered (62) (25) 1 (166) — (326) (578) Provision for (reversal of) loan losses 293 512 (690) (52) (8) 311 366 Balance at end of period $ 3,395 $ 2,660 $ 28,012 $ 2,017 $ 37 $ 182 $ 36,303 Three Months Ended June 30, 2022 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,604 $ 1,982 $ 27,225 $ 2,454 $ 48 $ 211 $ 35,524 Loans charged-off — — — (46) — (433) (479) Recoveries of loans charged-off 1 53 34 114 — 314 516 Net loans (charged-off) recovered 1 53 34 68 — (119) 37 Provision for (reversal of) loan losses (206) (11) (38) 36 (2) 109 (112) Balance at end of period $ 3,399 $ 2,024 $ 27,221 $ 2,558 $ 46 $ 201 $ 35,449 Six Months Ended June 30, 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 — — — (177) — (857) (1,034) Recoveries of loans charged-off 1 92 81 330 — 552 1,056 Net loans (charged-off) recovered 1 92 81 153 — (305) 22 Provision for (reversal of) loan losses (389) 66 160 8 (1) 310 154 Balance at end of period $ 3,399 $ 2,024 $ 27,221 $ 2,558 $ 46 $ 201 $ 35,449 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 June 30, 2023 and December 31, 2022, the accrued interest on our loan portfolio was $18.5 million and $18.8 million, respectively.

Borrowing Arrangements

Borrowing Arrangements	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Borrowing Arrangements	Borrowing Arrangements Information related to borrowings is provided in the table below (dollars in thousands): June 30, 2023 December 31, 2022 Other borrowings: Balance at end of period $ 500,341 $ 221,153 Average amount outstanding during the period (1) 467,205 77,845 Maximum amount outstanding during the period (2) 1,030,421 316,563 Weighted average interest rate during the period (3) 4.6 % 2.4 % Interest rate at end of period (4) 4.5 % 4.1 % FHLB borrowings: Balance at end of period $ 183,007 $ 153,358 Average amount outstanding during the period (1) 307,221 135,926 Maximum amount outstanding during the period (2) 533,242 423,645 Weighted average interest rate during the period (3) 2.7 % 2.4 % Interest rate at end of period (5) 0.9 % 0.7 % (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 June 30, 2023 are as follows (in thousands): Payments Due by Period Less than 1-2 Years 2-3 Years 3-4 Years 4-5 Years Thereafter Total Other borrowings $ 495,380 $ 3,611 $ 1,350 $ — $ — $ — $ 500,341 FHLB borrowings 180,725 756 679 396 416 35 183,007 Total obligations $ 676,105 $ 4,367 $ 2,029 $ 396 $ 416 $ 35 $ 683,348 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 June 30, 2023 or December 31, 2022. To provide more liquidity in response to economic conditions in recent years, the Federal Reserve has encouraged broader use of the discount window. At June 30, 2023, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities, was approximately $593.6 million. There were $100.0 million and $188.0 million in borrowings from the FRDW at June 30, 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 June 30, 2023, the amount of additional funding the Bank could obtain from the BTFP, collateralized by securities, was approximately $708,000. There were $296.2 million in borrowings from the BTFP at June 30, 2023. Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit, and at June 30, 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 $104.2 million at June 30, 2023 and $33.2 million at December 31, 2022, and had maturities of less than 3.0 years. Repurchase

Long-term Debt

Long-term Debt	6 Months Ended
	Jun. 30, 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): June 30, 2023 December 31, 2022 Subordinated notes: (1) 3.875% Subordinated notes, net of unamortized debt issuance costs (2) $ 93,796 $ 98,674 Total Subordinated notes 93,796 98,674 Trust preferred subordinated debentures: (3) Southside Statutory Trust III, net of unamortized debt issuance costs (4) 20,575 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 60,267 60,265 Total Long-term debt $ 154,063 $ 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 $1.2 million at June 30, 2023 and $1.3 million at 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 $44,000 at June 30, 2023 and $46,000 at December 31, 2022. As of June 30, 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 (1) November 6, 2020 $ 100,000 Fixed-to-Floating 3.875% November 15, 2030 Southside Statutory Trust III (2) September 4, 2003 $ 20,619 Floating 3 month LIBOR + 2.94% September 4, 2033 Southside Statutory Trust IV (2) August 8, 2007 $ 23,196 Floating 3 month LIBOR + 1.30% October 30, 2037 Southside Statutory Trust V (2) August 10, 2007 $ 12,887 Floating 3 month LIBOR + 2.25% September 15, 2037 Magnolia Trust Company I (2) (3) May 20, 2005 $ 3,609 Floating 3 month LIBOR + 1.80% November 23, 2035 (1) On June 14, 2023, the Company repurchased $5.0 million of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030. (2) Effective July 1, 2023, the Company began utilizing SOFR to reset rates on our floating rate trust preferred subordinated debentures, due to the fact that LIBOR ceased to be published as of June 30, 2023. (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. 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.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 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 June 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2023 2022 2023 2022 2023 2022 Interest cost $ 961 $ 691 $ 31 $ 25 $ 209 $ 150 Expected return on assets (1,144) (1,462) (46) (57) — — Net loss amortization 197 169 — — 8 72 Net periodic benefit cost (income) $ 14 $ (602) $ (15) $ (32) $ 217 $ 222 Six Months Ended June 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2023 2022 2023 2022 2023 2022 Interest cost $ 1,886 $ 1,371 $ 63 $ 51 $ 415 $ 289 Expected return on assets (2,287) (2,923) (93) (116) — — Net loss amortization 363 320 — — 15 127 Net periodic benefit cost (income) $ (38) $ (1,232) $ (30) $ (65) $ 430 $ 416 The noncash adjustment to the employee benefit plan liabilities, consisting of changes in net loss, was $378,000 and $447,000 for the six months ended June 30, 2023 and 2022, respectively.

Derivative Financial Instrument

Derivative Financial Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 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 $760.0 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. 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. During the second quarter of 2023, we terminated one interest rate swap contract designated as a cash flow hedge. At the time of termination, we determined the underlying hedged forecasted transactions were still probable of occurring. The existing loss in AOCI will be reclassified into earnings in the same periods the hedged forecasted transaction affects earnings. 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 June 30, 2023, hedged securities with a carrying amount of $661.1 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. During the second quarter of 2023, we terminated some of our fair value hedging relationships and sold the hedged items. As a result of the sale, the cumulative adjustments to the carrying amount was a fair value gain recognized in earnings and recorded in noninterest income. 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 June 30, 2023 and December 31, 2022, net derivative assets included $78.3 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): June 30, 2023 December 31, 2022 Estimated Fair Value Estimated Fair Value Notional (1) Asset Derivative Liability Derivative Notional (1) Asset Derivative Liability Derivative Derivatives designated as hedging instruments Interest rate contracts: Swaps-Cash Flow Hedge-Financial institution counterparties $ 760,000 $ 38,507 $ — $ 575,000 $ 39,527 $ — Swaps-Fair Value Hedge-Financial institution counterparties 654,870 27,910 — 742,675 21,733 171 Derivatives designated as non-hedging instruments Interest rate contracts: Swaps-Financial institution counterparties 218,901 21,282 — 223,124 21,046 — Swaps-Customer counterparties 218,901 — 21,282 223,124 — 21,046 Gross derivatives 87,699 21,282 82,306 21,217 Offsetting derivative assets/liabilities — — (171) (171) Cash collateral received/posted (78,260) — (82,135) — Net derivatives included in the consolidated balance sheets (2) $ 9,439 $ 21,282 $ — $ 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 $9.4 million credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at June 30, 2023. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at 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 June 30, 2023 and December 31, 2022: June 30, 2023 December 31, 2022 Weighted Average Weighted Average Notional Amount Remaining Maturity Receive Rate Pay Rate Notional Amount Remaining Maturity Receive Rate Pay Swaps-Cash Flow hedge Financial institution counterparties $ 760,000 2.6 5.23 % 2.02 % $ 575,000 2.3 4.44 % 1.13 % Swaps-Fair Value hedge Financial institution counterparties 654,870 5.8 4.91 % 3.19 % 742,675 6.3 3.42 % 3.21 % Swaps-Non-hedging Financial institution counterparties 218,901 8.6 5.71 % 2.67 % 223,124 9.0 4.83 % 2.69 % Customer counterparties 218,901 8.6 2.67 % 5.71 % 223,124 9.0 2.69 % 4.83 %

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 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 June 30, 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 June 30, 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 June 30, 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 $ 298,998 $ 298,998 $ — $ — State and political subdivisions 770,283 — 770,283 — Corporate bonds and other 12,991 — 12,991 — MBS: (1) Residential 247,233 — 247,233 — Commercial 10,316 — 10,316 — Equity investments: Equity investments 5,235 5,235 — — Derivative assets: Interest rate swaps 87,699 — 87,699 — Total asset recurring fair value measurements $ 1,432,755 $ 304,233 $ 1,128,522 $ — Derivative liabilities: Interest rate swaps $ 21,282 $ — $ 21,282 $ — Total liability recurring fair value measurements $ 21,282 $ — $ 21,282 $ — Nonrecurring fair value measurements Foreclosed assets $ 42 $ — $ — $ 42 Collateral-dependent loans (2) 7,539 — — 7,539 Total asset nonrecurring fair value measurements $ 7,581 $ — $ — $ 7,581 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 June 30, 2023 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 207,113 $ 207,113 $ 207,113 $ — $ — Investment securities: HTM, at carrying value 1,184,922 1,035,925 — 1,035,925 — MBS: HTM, at carrying value 123,550 112,890 — 112,890 — FHLB stock, at cost 10,801 10,801 — 10,801 — Equity investments 4,337 4,337 — 4,337 — Loans, net of allowance for loan losses 4,292,740 3,989,515 — — 3,989,515 Loans held for sale 1,666 1,666 — 1,666 — Financial liabilities: Deposits $ 6,117,687 $ 6,081,139 $ — $ 6,081,139 $ — Other borrowings 500,341 502,199 — 502,199 — FHLB borrowings 183,007 169,942 — 169,942 — Subordinated notes, net of unamortized debt issuance costs 93,796 85,323 — 85,323 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,267 54,964 — 54,964 — Estimated Fair Value December 31, 2022 Carrying 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 —

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 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 Six Months Ended 2023 2022 2023 2022 Current income tax expense $ 4,690 $ 2,939 $ 9,427 $ 5,800 Deferred income tax expense (benefit) (122) 358 (316) 643 Income tax expense $ 4,568 $ 3,297 $ 9,111 $ 6,443 The net deferred tax asset totaled $29.2 million at June 30, 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 June 30, 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 June 30, 2023 or December 31, 2022.

Off-Balance-Sheet Arrangements,

Off-Balance-Sheet Arrangements, Commitments and Contingencies	6 Months Ended
	Jun. 30, 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 Six Months Ended 2023 2022 2023 2022 Balance at beginning of period $ 3,559 $ 2,412 $ 3,687 $ 2,384 Provision for (reversal of) off-balance-sheet credit exposures (352) (521) (480) (493) Balance at end of period $ 3,207 $ 1,891 $ 3,207 $ 1,891 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): June 30, 2023 December 31, 2022 Commitments to extend credit $ 1,240,994 $ 1,296,773 Standby letters of credit 12,646 26,844 Total $ 1,253,640 $ 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 the three and six months ended June 30, 2023, there were $411,000 and $603,000, respectively, operating lease ROU assets obtained in exchange for new operating lease liabilities. During the three and six months ended June 30, 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 June 30, 2023, there were no unsettled trades to purchase securities and $31.5 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 June 30, 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.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Pay vs Performance Disclosure
Net income	$ 24,893	$ 26,034	$ 25,405	$ 24,996	$ 50,927	$ 50,401

Summary of Significant Accoun_2

Summary of Significant Accounting and Reporting Policies (Policies)	6 Months Ended
	Jun. 30, 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.
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. Our 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

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended 2023 2022 2023 2022 Basic and Diluted Earnings: Net income $ 24,893 $ 25,405 $ 50,927 $ 50,401 Basic weighted-average shares outstanding 30,721 32,119 31,045 32,237 Add: Stock awards 33 132 54 157 Diluted weighted-average shares outstanding 30,754 32,251 31,099 32,394 Basic earnings per share: Net income $ 0.81 $ 0.79 $ 1.64 $ 1.56 Diluted earnings per share: Net income $ 0.81 $ 0.79 $ 1.64 $ 1.56

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2023 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (135,627) $ 21,680 $ (19,365) $ (133,312) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications 6,831 15,876 — 22,707 Reclassification adjustments included in net income 5,444 (6,054) 205 (405) Income tax (expense) benefit (2,577) (2,063) (43) (4,683) Net current-period other comprehensive income (loss), net of tax 9,698 7,759 162 17,619 Ending balance, net of tax $ (125,929) $ 29,439 $ (19,203) $ (115,693) Six Months Ended June 30, 2023 Retirement Plans 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 (loss) income before reclassifications 19,850 8,900 — 28,750 Reclassification adjustments included in net income 9,582 (11,162) 378 (1,202) Income tax (expense) benefit (6,180) 474 (79) (5,785) Net current-period other comprehensive income (loss), net of tax 23,252 (1,788) 299 21,763 Ending balance, net of tax $ (125,929) $ 29,439 $ (19,203) $ (115,693) Three Months Ended June 30, 2022 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (72,699) $ 16,018 $ (23,590) $ (80,271) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications (85,883) 7,047 — (78,836) Reclassification adjustments included in net income 3,487 344 241 4,072 Income tax (expense) benefit 17,303 (1,552) (51) 15,700 Net current-period other comprehensive income (loss), net of tax (65,093) 5,839 190 (59,064) Ending balance, net of tax $ (137,792) $ 21,857 $ (23,400) $ (139,335) Six Months Ended June 30, 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 (286,928) 27,593 — (259,335) Reclassification adjustments included in net income 5,273 1,666 447 7,386 Income tax (expense) benefit 59,147 (6,145) (93) 52,909 Net current-period other comprehensive income (loss), net of tax (222,508) 23,114 354 (199,040) Ending balance, net of tax $ (137,792) $ 21,857 $ (23,400) $ (139,335)
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 Six Months Ended 2023 2022 2023 2022 Unrealized gains and losses on securities transferred: Amortization of unrealized gains and losses (1) $ (1,989) $ (1,310) $ (3,981) $ (1,553) Tax benefit 418 275 836 326 Net of tax (1,571) (1,035) (3,145) (1,227) Unrealized gains and losses on available for sale securities: Realized net gain (loss) on sale of securities (2) (3,455) (2,177) (5,601) (3,720) Tax (expense) benefit 725 457 1,176 781 Net of tax (2,730) (1,720) (4,425) (2,939) Derivatives: Realized net gain (loss) on interest rate swap derivatives (3) 6,054 (344) 11,162 (1,666) Tax benefit (1,272) 72 (2,344) 350 Net of tax 4,782 (272) 8,818 (1,316) Amortization of pension plan: Net actuarial loss (4) (205) (241) (378) (447) Tax benefit 43 51 79 93 Net of tax (162) (190) (299) (354) Total reclassifications for the period, net of tax $ 319 $ (3,217) $ 949 $ (5,836) (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.”

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2023 and December 31, 2022 are reflected in the tables below (in thousands): June 30, 2023 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 298,907 $ 91 $ — $ 298,998 State and political subdivisions 826,193 750 56,660 770,283 Corporate bonds and other 14,532 18 1,559 12,991 MBS: (1) Residential 258,683 171 11,621 247,233 Commercial 11,253 47 984 10,316 Total $ 1,409,568 $ 1,077 $ 70,824 $ 1,339,821 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,038,551 $ 7,093 $ 139,616 $ 906,028 Corporate bonds and other 146,371 421 16,895 129,897 MBS: (1) Residential 92,920 9 8,225 84,704 Commercial 30,630 — 2,444 28,186 Total $ 1,308,472 $ 7,523 $ 167,180 $ 1,148,815 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 June 30, 2023 and December 31, 2022, segregated by major security type and length of time in a continuous loss position (in thousands): June 30, 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 $ 116,217 $ 1,862 $ 602,120 $ 54,798 $ 718,337 $ 56,660 Corporate bonds and other 12,786 1,559 — — 12,786 1,559 MBS: Residential 169,577 6,585 61,126 5,036 230,703 11,621 Commercial — — 8,047 984 8,047 984 Total $ 298,580 $ 10,006 $ 671,293 $ 60,818 $ 969,873 $ 70,824 HELD TO MATURITY Investment securities: State and political subdivisions $ 140,247 $ 7,452 $ 606,783 $ 132,164 $ 747,030 $ 139,616 Corporate bonds and other 29,119 4,522 98,082 12,373 127,201 16,895 MBS: Residential 18,021 1,267 66,019 6,958 84,040 8,225 Commercial — — 28,186 2,444 28,186 2,444 Total $ 187,387 $ 13,241 $ 799,070 $ 153,939 $ 986,457 $ 167,180 December 31, 2022 Less Than 12 Months More Than 12 Months Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized 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 2023 2022 U.S. Treasury $ 3,826 $ 59 State and political subdivisions 16,901 13,788 Corporate bonds and other 1,766 1,390 MBS 3,830 3,238 Total interest income on securities $ 26,323 $ 18,475 Six Months Ended 2023 2022 U.S. Treasury $ 4,523 $ 227 State and political subdivisions 34,000 27,120 Corporate bonds and other 3,598 2,717 MBS 8,159 7,255 Total interest income on securities $ 50,280 $ 37,319
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 June 30, 2023, are presented below by contractual maturity (in thousands): June 30, 2023 Amortized Cost Fair Value AVAILABLE FOR SALE Investment securities: Due in one year or less $ 299,118 $ 299,208 Due after one year through five years 1,564 1,591 Due after five years through ten years 32,280 30,881 Due after ten years 806,670 750,592 1,139,632 1,082,272 MBS: 269,936 257,549 Total $ 1,409,568 $ 1,339,821 June 30, 2023 Amortized Cost Fair Value HELD TO MATURITY Investment securities: Due in one year or less $ 125 $ 124 Due after one year through five years 20,809 20,016 Due after five years through ten years 136,422 120,546 Due after ten years 1,027,566 895,239 1,184,922 1,035,925 MBS: 123,550 112,890 Total $ 1,308,472 $ 1,148,815
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 Six Months Ended 2023 2022 2023 2022 Net gains (losses) recognized during the period on equity investments $ 2,558 $ (191) $ 5,058 $ (466) Less: Net gains recognized during the period on equity investments sold during the period 2,642 — 5,058 — Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date $ (84) $ (191) $ — $ (466)

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2023
Receivables [Abstract]
Loans by Portfolio Segment	Loans in the accompanying consolidated balance sheets are classified as follows (in thousands): June 30, 2023 December 31, 2022 Real estate loans: Construction $ 657,354 $ 559,681 1-4 family residential 684,878 663,519 Commercial 2,100,338 1,987,707 Commercial loans 383,724 412,064 Municipal loans 435,211 450,067 Loans to individuals 67,538 74,653 Total loans 4,329,043 4,147,691 Less: Allowance for loan losses 36,303 36,515 Net loans $ 4,292,740 $ 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): June 30, 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 $ 67,993 $ 190,372 $ 177,651 $ 31,227 $ 4,291 $ 6,267 $ 159,462 $ 637,263 Pass watch — 2,444 1,557 — — — 14,785 18,786 Special mention 161 395 — — 9 — — 565 Substandard — — 136 — — 225 — 361 Doubtful — — 42 — 337 — — 379 Total construction real estate $ 68,154 $ 193,211 $ 179,386 $ 31,227 $ 4,637 $ 6,492 $ 174,247 $ 657,354 Current period gross charge-offs $ — $ 63 $ — $ — $ — $ — $ — $ 63 1-4 family residential real estate: Pass $ 25,409 $ 105,843 $ 144,970 $ 122,025 $ 66,539 $ 212,648 $ 2,205 $ 679,639 Pass watch — — — 1,099 — 1,364 — 2,463 Special mention — — 63 206 123 2,150 — 2,542 Substandard — — — — — 234 — 234 Doubtful — — — — — — — — Total 1-4 family residential real estate $ 25,409 $ 105,843 $ 145,033 $ 123,330 $ 66,662 $ 216,396 $ 2,205 $ 684,878 Current period gross charge-offs $ — $ — $ — $ — $ — $ 71 $ — $ 71 Commercial real estate: Pass $ 268,423 $ 756,424 $ 524,837 $ 152,119 $ 98,968 $ 224,529 $ 15,889 $ 2,041,189 Pass watch 15,690 — 265 — 7,964 11,563 — 35,482 Special mention 2,019 — — — 223 188 — 2,430 Substandard — — 100 274 14,304 6,386 — 21,064 Doubtful — — — — 72 101 — 173 Total commercial real estate $ 286,132 $ 756,424 $ 525,202 $ 152,393 $ 121,531 $ 242,767 $ 15,889 $ 2,100,338 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial loans: Pass $ 36,239 $ 88,384 $ 57,919 $ 14,309 $ 5,897 $ 5,441 $ 161,472 $ 369,661 Pass watch 26 193 134 — — — 200 553 Special mention — 180 4,890 23 — 249 6,709 12,051 Substandard 168 395 87 — 61 8 20 739 Doubtful — 328 164 — 75 153 — 720 Total commercial loans $ 36,433 $ 89,480 $ 63,194 $ 14,332 $ 6,033 $ 5,851 $ 168,401 $ 383,724 Current period gross charge-offs $ — $ 290 $ 29 $ 22 $ 23 $ 5 $ — $ 369 Municipal loans: Pass $ 11,835 $ 62,834 $ 72,572 $ 52,677 $ 44,579 $ 190,714 $ — $ 435,211 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 11,835 $ 62,834 $ 72,572 $ 52,677 $ 44,579 $ 190,714 $ — $ 435,211 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 14,071 $ 21,029 $ 15,872 $ 9,246 $ 3,284 $ 1,410 $ 2,582 $ 67,494 Pass watch — — — — — 1 — 1 Special mention — — — — — — — — Substandard — — 17 — 20 — — 37 Doubtful — — 6 — — — — 6 Total loans to individuals $ 14,071 $ 21,029 $ 15,895 $ 9,246 $ 3,304 $ 1,411 $ 2,582 $ 67,538 Current period gross charge-offs (1) $ 729 $ 31 $ 22 $ 6 $ 2 $ 77 $ — $ 867 Total loans $ 442,034 $ 1,228,821 $ 1,001,282 $ 383,205 $ 246,746 $ 663,631 $ 363,324 $ 4,329,043 Total current period gross charge-offs (1) $ 729 $ 384 $ 51 $ 28 $ 25 $ 153 $ — $ 1,370 (1) Includes $729,000 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): June 30, 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 $ 122 $ 6 $ 136 $ 264 $ 657,090 $ 657,354 1-4 family residential 1,406 1,371 585 3,362 681,516 684,878 Commercial 708 143 38 889 2,099,449 2,100,338 Commercial loans 593 416 103 1,112 382,612 383,724 Municipal loans — — — — 435,211 435,211 Loans to individuals 387 19 — 406 67,132 67,538 Total $ 3,216 $ 1,955 $ 862 $ 6,033 $ 4,323,010 $ 4,329,043 December 31, 2022 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days 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): June 30, 2023 December 31, 2022 Nonaccrual loans: Real estate loans: Construction $ 521 $ 405 1-4 family residential 1,005 848 Commercial 554 762 Commercial loans 930 757 Loans to individuals 7 74 Total nonaccrual loans (1) 3,017 2,846 Accruing loans past due more than 90 days — — Restructured loans (2) — 7,849 OREO — 93 Repossessed assets 42 74 Total nonperforming assets $ 3,059 $ 10,862 (1) Includes $314,000 and $897,000 of restructured loans as of June 30, 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 June 30, 2023 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,152 $ 2,314 $ 28,721 $ 1,901 $ 44 $ 200 $ 36,332 Loans charged-off (63) (22) — (260) — (392) (737) Recoveries of loans charged-off — 41 1 143 — 245 430 Net loans (charged-off) recovered (63) 19 1 (117) — (147) (307) Provision for (reversal of) loan losses 306 327 (710) 233 (7) 129 278 Balance at end of period $ 3,395 $ 2,660 $ 28,012 $ 2,017 $ 37 $ 182 $ 36,303 Six Months Ended June 30, 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 (63) (71) — (369) — (867) (1,370) Recoveries of loans charged-off 1 46 1 203 — 541 792 Net loans (charged-off) recovered (62) (25) 1 (166) — (326) (578) Provision for (reversal of) loan losses 293 512 (690) (52) (8) 311 366 Balance at end of period $ 3,395 $ 2,660 $ 28,012 $ 2,017 $ 37 $ 182 $ 36,303 Three Months Ended June 30, 2022 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,604 $ 1,982 $ 27,225 $ 2,454 $ 48 $ 211 $ 35,524 Loans charged-off — — — (46) — (433) (479) Recoveries of loans charged-off 1 53 34 114 — 314 516 Net loans (charged-off) recovered 1 53 34 68 — (119) 37 Provision for (reversal of) loan losses (206) (11) (38) 36 (2) 109 (112) Balance at end of period $ 3,399 $ 2,024 $ 27,221 $ 2,558 $ 46 $ 201 $ 35,449 Six Months Ended June 30, 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 — — — (177) — (857) (1,034) Recoveries of loans charged-off 1 92 81 330 — 552 1,056 Net loans (charged-off) recovered 1 92 81 153 — (305) 22 Provision for (reversal of) loan losses (389) 66 160 8 (1) 310 154 Balance at end of period $ 3,399 $ 2,024 $ 27,221 $ 2,558 $ 46 $ 201 $ 35,449

Borrowing Arrangements (Tables)

Borrowing Arrangements (Tables)	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Schedule of Debt	Information related to borrowings is provided in the table below (dollars in thousands): June 30, 2023 December 31, 2022 Other borrowings: Balance at end of period $ 500,341 $ 221,153 Average amount outstanding during the period (1) 467,205 77,845 Maximum amount outstanding during the period (2) 1,030,421 316,563 Weighted average interest rate during the period (3) 4.6 % 2.4 % Interest rate at end of period (4) 4.5 % 4.1 % FHLB borrowings: Balance at end of period $ 183,007 $ 153,358 Average amount outstanding during the period (1) 307,221 135,926 Maximum amount outstanding during the period (2) 533,242 423,645 Weighted average interest rate during the period (3) 2.7 % 2.4 % Interest rate at end of period (5) 0.9 % 0.7 % (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 June 30, 2023 are as follows (in thousands): Payments Due by Period Less than 1-2 Years 2-3 Years 3-4 Years 4-5 Years Thereafter Total Other borrowings $ 495,380 $ 3,611 $ 1,350 $ — $ — $ — $ 500,341 FHLB borrowings 180,725 756 679 396 416 35 183,007 Total obligations $ 676,105 $ 4,367 $ 2,029 $ 396 $ 416 $ 35 $ 683,348

Long-term Debt (Tables)

Long-term Debt (Tables)	6 Months Ended
	Jun. 30, 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): June 30, 2023 December 31, 2022 Subordinated notes: (1) 3.875% Subordinated notes, net of unamortized debt issuance costs (2) $ 93,796 $ 98,674 Total Subordinated notes 93,796 98,674 Trust preferred subordinated debentures: (3) Southside Statutory Trust III, net of unamortized debt issuance costs (4) 20,575 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 60,267 60,265 Total Long-term debt $ 154,063 $ 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 $1.2 million at June 30, 2023 and $1.3 million at 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.
Schedule of Subordinated Borrowing	As of June 30, 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 (1) November 6, 2020 $ 100,000 Fixed-to-Floating 3.875% November 15, 2030 Southside Statutory Trust III (2) September 4, 2003 $ 20,619 Floating 3 month LIBOR + 2.94% September 4, 2033 Southside Statutory Trust IV (2) August 8, 2007 $ 23,196 Floating 3 month LIBOR + 1.30% October 30, 2037 Southside Statutory Trust V (2) August 10, 2007 $ 12,887 Floating 3 month LIBOR + 2.25% September 15, 2037 Magnolia Trust Company I (2) (3) May 20, 2005 $ 3,609 Floating 3 month LIBOR + 1.80% November 23, 2035 (1) On June 14, 2023, the Company repurchased $5.0 million of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030. (2) Effective July 1, 2023, the Company began utilizing SOFR to reset rates on our floating rate trust preferred subordinated debentures, due to the fact that LIBOR ceased to be published as of June 30, 2023. (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.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 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 June 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2023 2022 2023 2022 2023 2022 Interest cost $ 961 $ 691 $ 31 $ 25 $ 209 $ 150 Expected return on assets (1,144) (1,462) (46) (57) — — Net loss amortization 197 169 — — 8 72 Net periodic benefit cost (income) $ 14 $ (602) $ (15) $ (32) $ 217 $ 222 Six Months Ended June 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2023 2022 2023 2022 2023 2022 Interest cost $ 1,886 $ 1,371 $ 63 $ 51 $ 415 $ 289 Expected return on assets (2,287) (2,923) (93) (116) — — Net loss amortization 363 320 — — 15 127 Net periodic benefit cost (income) $ (38) $ (1,232) $ (30) $ (65) $ 430 $ 416

Derivative Financial Instrume_2

Derivative Financial Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 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): June 30, 2023 December 31, 2022 Estimated Fair Value Estimated Fair Value Notional (1) Asset Derivative Liability Derivative Notional (1) Asset Derivative Liability Derivative Derivatives designated as hedging instruments Interest rate contracts: Swaps-Cash Flow Hedge-Financial institution counterparties $ 760,000 $ 38,507 $ — $ 575,000 $ 39,527 $ — Swaps-Fair Value Hedge-Financial institution counterparties 654,870 27,910 — 742,675 21,733 171 Derivatives designated as non-hedging instruments Interest rate contracts: Swaps-Financial institution counterparties 218,901 21,282 — 223,124 21,046 — Swaps-Customer counterparties 218,901 — 21,282 223,124 — 21,046 Gross derivatives 87,699 21,282 82,306 21,217 Offsetting derivative assets/liabilities — — (171) (171) Cash collateral received/posted (78,260) — (82,135) — Net derivatives included in the consolidated balance sheets (2) $ 9,439 $ 21,282 $ — $ 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.
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 June 30, 2023 and December 31, 2022: June 30, 2023 December 31, 2022 Weighted Average Weighted Average Notional Amount Remaining Maturity Receive Rate Pay Rate Notional Amount Remaining Maturity Receive Rate Pay Swaps-Cash Flow hedge Financial institution counterparties $ 760,000 2.6 5.23 % 2.02 % $ 575,000 2.3 4.44 % 1.13 % Swaps-Fair Value hedge Financial institution counterparties 654,870 5.8 4.91 % 3.19 % 742,675 6.3 3.42 % 3.21 % Swaps-Non-hedging Financial institution counterparties 218,901 8.6 5.71 % 2.67 % 223,124 9.0 4.83 % 2.69 % Customer counterparties 218,901 8.6 2.67 % 5.71 % 223,124 9.0 2.69 % 4.83 %

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 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 $ 298,998 $ 298,998 $ — $ — State and political subdivisions 770,283 — 770,283 — Corporate bonds and other 12,991 — 12,991 — MBS: (1) Residential 247,233 — 247,233 — Commercial 10,316 — 10,316 — Equity investments: Equity investments 5,235 5,235 — — Derivative assets: Interest rate swaps 87,699 — 87,699 — Total asset recurring fair value measurements $ 1,432,755 $ 304,233 $ 1,128,522 $ — Derivative liabilities: Interest rate swaps $ 21,282 $ — $ 21,282 $ — Total liability recurring fair value measurements $ 21,282 $ — $ 21,282 $ — Nonrecurring fair value measurements Foreclosed assets $ 42 $ — $ — $ 42 Collateral-dependent loans (2) 7,539 — — 7,539 Total asset nonrecurring fair value measurements $ 7,581 $ — $ — $ 7,581 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 June 30, 2023 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 207,113 $ 207,113 $ 207,113 $ — $ — Investment securities: HTM, at carrying value 1,184,922 1,035,925 — 1,035,925 — MBS: HTM, at carrying value 123,550 112,890 — 112,890 — FHLB stock, at cost 10,801 10,801 — 10,801 — Equity investments 4,337 4,337 — 4,337 — Loans, net of allowance for loan losses 4,292,740 3,989,515 — — 3,989,515 Loans held for sale 1,666 1,666 — 1,666 — Financial liabilities: Deposits $ 6,117,687 $ 6,081,139 $ — $ 6,081,139 $ — Other borrowings 500,341 502,199 — 502,199 — FHLB borrowings 183,007 169,942 — 169,942 — Subordinated notes, net of unamortized debt issuance costs 93,796 85,323 — 85,323 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,267 54,964 — 54,964 — Estimated Fair Value December 31, 2022 Carrying 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 —

Income Taxes Income Taxes (Tabl

Income Taxes Income Taxes (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended 2023 2022 2023 2022 Current income tax expense $ 4,690 $ 2,939 $ 9,427 $ 5,800 Deferred income tax expense (benefit) (122) 358 (316) 643 Income tax expense $ 4,568 $ 3,297 $ 9,111 $ 6,443

Off-Balance-Sheet Arrangement_2

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended 2023 2022 2023 2022 Balance at beginning of period $ 3,559 $ 2,412 $ 3,687 $ 2,384 Provision for (reversal of) off-balance-sheet credit exposures (352) (521) (480) (493) Balance at end of period $ 3,207 $ 1,891 $ 3,207 $ 1,891
Schedule of unused commitments	Financial instruments with off-balance-sheet risk were as follows (in thousands): June 30, 2023 December 31, 2022 Commitments to extend credit $ 1,240,994 $ 1,296,773 Standby letters of credit 12,646 26,844 Total $ 1,253,640 $ 1,323,617

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic and Diluted Earnings:
Net income	$ 24,893	$ 26,034	$ 25,405	$ 24,996	$ 50,927	$ 50,401
Basic weighted-average shares outstanding (in shares)	30,721		32,119		31,045	32,237
Add: Stock awards (in shares)	33		132		54	157
Diluted weighted-average shares outstanding (in shares)	30,754		32,251		31,099	32,394
Basic earnings per share:
Earnings per common share - basic (in dollars per share)	$ 0.81		$ 0.79		$ 1.64	$ 1.56
Diluted earnings per share:
Earnings per common share - diluted (in dollars per share)	$ 0.81		$ 0.79		$ 1.64	$ 1.56
Number of antidilutive options (in shares)	686		18		578	1

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	$ 751,030	$ 784,241	$ 745,997	$ 912,172
Income tax (expense) benefit	(4,683)	15,700	(5,785)	52,909
Ending balance, net of tax	765,161	731,782	765,161	731,782
Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(135,627)	(72,699)	(149,181)	84,716
Other comprehensive (loss) income before reclassifications	6,831	(85,883)	19,850	(286,928)
Reclassification adjustments included in net income	5,444	3,487	9,582	5,273
Income tax (expense) benefit	(2,577)	17,303	(6,180)	59,147
Net current-period other comprehensive income (loss), net of tax	9,698	(65,093)	23,252	(222,508)
Ending balance, net of tax	(125,929)	(137,792)	(125,929)	(137,792)
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	21,680	16,018	31,227	(1,257)
Other comprehensive (loss) income before reclassifications	15,876	7,047	8,900	27,593
Reclassification adjustments included in net income	(6,054)	344	(11,162)	1,666
Income tax (expense) benefit	(2,063)	(1,552)	474	(6,145)
Net current-period other comprehensive income (loss), net of tax	7,759	5,839	(1,788)	23,114
Ending balance, net of tax	29,439	21,857	29,439	21,857
Retirement Plans
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(19,365)	(23,590)	(19,502)	(23,754)
Other comprehensive (loss) income before reclassifications	0	0	0	0
Reclassification adjustments included in net income	205	241	378	447
Income tax (expense) benefit	(43)	(51)	(79)	(93)
Net current-period other comprehensive income (loss), net of tax	162	190	299	354
Ending balance, net of tax	(19,203)	(23,400)	(19,203)	(23,400)
Total
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(133,312)	(80,271)	(137,456)	59,705
Other comprehensive (loss) income before reclassifications	22,707	(78,836)	28,750	(259,335)
Reclassification adjustments included in net income	(405)	4,072	(1,202)	7,386
Income tax (expense) benefit	(4,683)	15,700	(5,785)	52,909
Net current-period other comprehensive income (loss), net of tax	17,619	(59,064)	21,763	(199,040)
Ending balance, net of tax	$ (115,693)	$ (139,335)	$ (115,693)	$ (139,335)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized gains and losses		$ 1,989	$ 1,310	$ 3,981	$ 1,553
Tax benefit (expense)		(4,568)	(3,297)	(9,111)	(6,443)
Realized net gain (loss) on sale of securities		(3,455)	(2,177)	(5,601)	(3,720)
Total reclassifications for the period, net of tax		319	(3,217)	949	(5,836)
Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(5,444)	(3,487)	(9,582)	(5,273)
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		6,054	(344)	11,162	(1,666)
Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[1]	(205)	(241)	(378)	(447)
Amortization of pension plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(205)	(241)	(378)	(447)
Tax benefit		43	51	79	93
Total reclassifications for the period, net of tax		(162)	(190)	(299)	(354)
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]	(1,989)	(1,310)	(3,981)	(1,553)
Tax benefit (expense)		418	275	836	326
Net of tax		(1,571)	(1,035)	(3,145)	(1,227)
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)		725	457	1,176	781
Net of tax		(2,730)	(1,720)	(4,425)	(2,939)
Realized net gain (loss) on sale of securities	[3]	(3,455)	(2,177)	(5,601)	(3,720)
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)		(1,272)	72	(2,344)	350
Net of tax		4,782	(272)	8,818	(1,316)
Realized net (loss) gain on interest rate swap derivatives	[4]	$ 6,054	$ (344)	$ 11,162	$ (1,666)
[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.

Securities - Schedule of Debt S

Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Amortized Cost		$ 1,409,568	$ 1,387,874
Gross unrealized gains		1,077	1,282
Gross unrealized losses		70,824	90,142
Securities AFS, at estimated fair value (amortized cost of $1,409,568 and $1,387,874, respectively)		1,339,821	1,299,014
HELD TO MATURITY
Amortized cost		1,308,472	1,326,729
Gross unrealized gains		7,523	4,565
Gross unrealized losses		167,180	182,138
Estimated Fair Value		1,148,815	1,149,156
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		298,907
Gross unrealized gains		91
Gross unrealized losses		0
Securities AFS, at estimated fair value (amortized cost of $1,409,568 and $1,387,874, respectively)		298,998
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		826,193	1,039,453
Gross unrealized gains		750	956
Gross unrealized losses		56,660	75,557
Securities AFS, at estimated fair value (amortized cost of $1,409,568 and $1,387,874, respectively)		770,283	964,852
HELD TO MATURITY
Amortized cost		1,038,551	1,037,556
Gross unrealized gains		7,093	3,969
Gross unrealized losses		139,616	163,283
Estimated Fair Value		906,028	878,242
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,532	8,692
Gross unrealized gains		18	26
Gross unrealized losses		1,559	14
Securities AFS, at estimated fair value (amortized cost of $1,409,568 and $1,387,874, respectively)		12,991	8,704
HELD TO MATURITY
Amortized cost		146,371	152,552
Gross unrealized gains		421	575
Gross unrealized losses		16,895	7,993
Estimated Fair Value		129,897	145,134
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	258,683	328,400
Gross unrealized gains	[1]	171	250
Gross unrealized losses	[1]	11,621	13,623
Securities AFS, at estimated fair value (amortized cost of $1,409,568 and $1,387,874, respectively)	[1]	247,233	315,027
HELD TO MATURITY
Amortized cost	[1]	92,920	93,796
Gross unrealized gains	[1]	9	21
Gross unrealized losses	[1]	8,225	8,343
Estimated Fair Value	[1]	84,704	85,474
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	11,253	11,329
Gross unrealized gains	[1]	47	50
Gross unrealized losses	[1]	984	948
Securities AFS, at estimated fair value (amortized cost of $1,409,568 and $1,387,874, respectively)	[1]	10,316	10,431
HELD TO MATURITY
Amortized cost	[1]	30,630	42,825
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	2,444	2,519
Estimated Fair Value	[1]	$ 28,186	$ 40,306
[1]All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

Securities - Unrealized Loss on

Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 298,580	$ 1,174,855
Less than 12 Months, unrealized loss	10,006	82,638
More than 12 Months, fair value	671,293	29,165
More than 12 Months, unrealized Loss	60,818	7,504
Total fair value	969,873	1,204,020
Total unrealized loss	70,824	90,142
HELD TO MATURITY
Less than 12 months, fair value	187,387	672,739
Less than 12 months, unrealized loss	13,241	83,876
More than 12 months, fair value	799,070	340,055
More than 12 months, unrealized loss	153,939	98,262
Total fair value	986,457	1,012,794
Total unrealized loss	167,180	182,138
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	116,217	859,270
Less than 12 Months, unrealized loss	1,862	68,683
More than 12 Months, fair value	602,120	26,620
More than 12 Months, unrealized Loss	54,798	6,874
Total fair value	718,337	885,890
Total unrealized loss	56,660	75,557
HELD TO MATURITY
Less than 12 months, fair value	140,247	426,382
Less than 12 months, unrealized loss	7,452	66,898
More than 12 months, fair value	606,783	323,385
More than 12 months, unrealized loss	132,164	96,385
Total fair value	747,030	749,767
Total unrealized loss	139,616	163,283
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	12,786	3,678
Less than 12 Months, unrealized loss	1,559	14
More than 12 Months, fair value	0	0
More than 12 Months, unrealized Loss	0	0
Total fair value	12,786	3,678
Total unrealized loss	1,559	14
HELD TO MATURITY
Less than 12 months, fair value	29,119	125,250
Less than 12 months, unrealized loss	4,522	6,660
More than 12 months, fair value	98,082	12,738
More than 12 months, unrealized loss	12,373	1,333
Total fair value	127,201	137,988
Total unrealized loss	16,895	7,993
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	169,577	306,294
Less than 12 Months, unrealized loss	6,585	13,623
More than 12 Months, fair value	61,126	0
More than 12 Months, unrealized Loss	5,036	0
Total fair value	230,703	306,294
Total unrealized loss	11,621	13,623
HELD TO MATURITY
Less than 12 months, fair value	18,021	80,801
Less than 12 months, unrealized loss	1,267	7,799
More than 12 months, fair value	66,019	3,932
More than 12 months, unrealized loss	6,958	544
Total fair value	84,040	84,733
Total unrealized loss	8,225	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	8,047	2,545
More than 12 Months, unrealized Loss	984	630
Total fair value	8,047	8,158
Total unrealized loss	984	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	28,186	0
More than 12 months, unrealized loss	2,444	0
Total fair value	28,186	40,306
Total unrealized loss	$ 2,444	$ 2,519

Securities - Interest Income on

Securities - Interest Income on Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments, Debt Securities [Abstract]
US Treasury	$ 3,826	$ 59	$ 4,523	$ 227
State and political subdivisions	16,901	13,788	34,000	27,120
Corporate bonds and other	1,766	1,390	3,598	2,717
MBS	3,830	3,238	8,159	7,255
Total interest income on securities	$ 26,323	$ 18,475	$ 50,280	$ 37,319

Securities - Amortized Cost and

Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available for sale, Amortized Cost
Due in one year or less	$ 299,118
Due after one year through five years	1,564
Due after five years through ten years	32,280
Due after ten years	806,670
Total available-for-sale investment securities	1,139,632
MBS:	269,936
Amortized Cost	1,409,568	$ 1,387,874
Available for sale, Fair Value
Due in one year or less	299,208
Due after one year through five years	1,591
Due after five years through ten years	30,881
Due after ten years	750,592
Total available-for-sale investment securities	1,082,272
MBS:	257,549
Total	1,339,821	1,299,014
Held to maturity, Amortized Cost
Due in one year or less	125
Due after one year through five years	20,809
Due after five years through ten years	136,422
Due after ten years	1,027,566
Total held-to-maturity investment securities	1,184,922
Mortgage-backed securities	123,550
Amortized cost	1,308,472	1,326,729
Held to maturity, Fair Value
Due in one year or less	124
Due after one year through five years	20,016
Due after five years through ten years	120,546
Due after ten years	895,239
Total held-to-maturity investment securities	1,035,925
Mortgage-backed securities	112,890
Total	$ 1,148,815	$ 1,149,156

Securities - Unrealized and Rea

Securities - Unrealized and Realized Gain (Loss) Recognized in Net Income on Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments, All Other Investments [Abstract]
Net gains (losses) recognized during the period on equity investments	$ 2,558	$ (191)	$ 5,058	$ (466)
Less: Net gains recognized during the period on equity investments sold during the period	2,642	0	5,058	0
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date	$ (84)	$ (191)	$ 0	$ (466)

Securities - Narrative (Details

Securities - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) debt_security	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) debt_security	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0		$ 0		$ 0
Transferred Securities, Unrealized Loss, Before Tax	117,600,000		117,600,000		121,500,000
Securities transferred, Unrealized Loss, Net of Tax	92,900,000		92,900,000		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	3,455,000	$ 2,177,000	5,601,000	$ 3,720,000
Gross realized gains on AFS securities			1,400,000	4,000,000
Gross realized losses on AFS securities			7,000,000	290,000
Equity investments	9,572,000		9,572,000		11,181,000
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Sale of HTM portfolio			0	0
Interest receivable	48,265,000		48,265,000		49,350,000
Debt Securities, Held-to-maturity, Nonaccrual	0		0		0
FHLB stock with other-than-temporary impairment	0		0
Other-than-temporarily impaired equity investments	$ 0		$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | debt_security	524		524
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 207,113,000	172,289,000	$ 207,113,000	172,289,000	199,252,000	$ 201,753,000
Less: Net gains recognized during the period on equity investments sold during the period	2,642,000	0	5,058,000	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	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	0	$ 0
Asset Pledged as Collateral
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities	2,240,000,000		2,240,000,000		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		0
Available-for-sale Securities
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Interest receivable	16,300,000		16,300,000		16,900,000
Held-to-maturity Securities
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Interest receivable	$ 13,400,000		$ 13,400,000		$ 13,600,000

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans	$ 4,329,043		$ 4,147,691
Less: Allowance for loan losses	36,303	$ 36,332	36,515	$ 35,449	$ 35,524	$ 35,273
Total loans	4,292,740		4,111,176
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	657,354		559,681
Less: Allowance for loan losses	3,395	3,152	3,164	3,399	3,604	3,787
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	684,878		663,519
Less: Allowance for loan losses	2,660	2,314	2,173	2,024	1,982	1,866
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	2,100,338		1,987,707
Less: Allowance for loan losses	28,012	28,721	28,701	27,221	27,225	26,980
Commercial loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	383,724		412,064
Less: Allowance for loan losses	2,017	1,901	2,235	2,558	2,454	2,397
Municipal loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	435,211		450,067
Less: Allowance for loan losses	37	44	45	46	48	47
Loans to individuals
Loans and Leases Receivable Disclosure [Abstract]
Loans	67,538		74,653
Less: Allowance for loan losses	$ 182	$ 200	$ 197	$ 201	$ 211	$ 196

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses - Loans by Credit Quality Indicator and Origination Year (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		$ 442,034		$ 442,034		$ 1,262,330
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		1,228,821		1,228,821		1,055,361
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		1,001,282		1,001,282		422,026
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		383,205		383,205		290,975
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		246,746		246,746		128,067
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		663,631		663,631		630,012
Financing Receivable, Excluding Accrued Interest, Revolving		363,324		363,324		358,920
Loans		4,329,043		4,329,043		4,147,691
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	[1]			729
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff				384
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff				51
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff				28
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff				25
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff				153
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff				0
Loans charged-off		737	$ 479	1,370	$ 1,034
Construction Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		68,154		68,154		171,809
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		193,211		193,211		184,835
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		179,386		179,386		34,537
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		31,227		31,227		7,456
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		4,637		4,637		1,886
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,492		6,492		6,628
Financing Receivable, Excluding Accrued Interest, Revolving		174,247		174,247		152,530
Loans		657,354		657,354		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				63
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		63	0	63	0
Construction Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		67,993		67,993		169,652
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		190,372		190,372		184,501
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		177,651		177,651		34,537
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		31,227		31,227		7,091
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		4,291		4,291		1,844
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,267		6,267		6,434
Financing Receivable, Excluding Accrued Interest, Revolving		159,462		159,462		152,530
Loans		637,263		637,263		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		0		299
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		2,444		2,444		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		1,557		1,557		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		14,785		14,785		0
Loans		18,786		18,786		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		161		161		1,858
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		395		395		290
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		9		9		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		565		565		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		136		136		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		10
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		42
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		225		225		194
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		361		361		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		44
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		42		42		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		355
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		337		337		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		379		379		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		25,409		25,409		82,850
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		105,843		105,843		144,424
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		145,033		145,033		128,962
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		123,330		123,330		70,196
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		66,662		66,662		38,312
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		216,396		216,396		196,572
Financing Receivable, Excluding Accrued Interest, Revolving		2,205		2,205		2,203
Loans		684,878		684,878		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				71
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff				0
Loans charged-off		22	0	71	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		25,409		25,409		82,847
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		105,843		105,843		144,424
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		144,970		144,970		128,666
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		122,025		122,025		70,142
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		66,539		66,539		36,710
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		212,648		212,648		194,490
Financing Receivable, Excluding Accrued Interest, Revolving		2,205		2,205		2,160
Loans		679,639		679,639		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		1,099		1,099		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		1,364		1,364		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		2,463		2,463		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		63		63		79
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		206		206		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		123		123		1,397
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		2,150		2,150		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		2,542		2,542		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		0		3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		217
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		54
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		32
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		234		234		1,942
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		43
Loans		234		234		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		173
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		140
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		0		0		313
Commercial Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		286,132		286,132		798,653
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		756,424		756,424		556,157
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		525,202		525,202		170,720
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		152,393		152,393		151,449
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		121,531		121,531		55,855
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		242,767		242,767		242,558
Financing Receivable, Excluding Accrued Interest, Revolving		15,889		15,889		12,315
Loans		2,100,338		2,100,338		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	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		268,423		268,423		798,653
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		756,424		756,424		546,938
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		524,837		524,837		168,607
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		152,119		152,119		136,440
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		98,968		98,968		55,480
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		224,529		224,529		233,509
Financing Receivable, Excluding Accrued Interest, Revolving		15,889		15,889		12,315
Loans		2,041,189		2,041,189		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		15,690		15,690		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		9,219
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		265		265		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		7,964		7,964		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		11,563		11,563		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		35,482		35,482		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		2,019		2,019		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		1,832
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		330
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		223		223		115
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		188		188		1,849
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		2,430		2,430		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		100		100		281
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		274		274		14,603
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		14,304		14,304		260
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,386		6,386		6,992
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		21,064		21,064		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		76
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		72		72		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		101		101		208
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		173		173		284
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		36,433		36,433		114,174
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		89,480		89,480		73,847
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		63,194		63,194		18,009
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		14,332		14,332		8,445
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		6,033		6,033		5,330
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		5,851		5,851		3,322
Financing Receivable, Excluding Accrued Interest, Revolving		168,401		168,401		188,937
Loans		383,724		383,724		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				290
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff				29
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff				22
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff				23
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff				5
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff				0
Loans charged-off		260	46	369	177
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		36,239		36,239		113,678
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		88,384		88,384		68,509
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		57,919		57,919		17,852
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		14,309		14,309		8,249
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		5,897		5,897		4,820
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		5,441		5,441		3,313
Financing Receivable, Excluding Accrued Interest, Revolving		161,472		161,472		178,951
Loans		369,661		369,661		395,372
Commercial loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		26		26		208
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		193		193		13
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		134		134		56
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		200		200		0
Loans		553		553		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		180		180		5,109
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		4,890		4,890		31
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		23		23		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		288
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		249		249		0
Financing Receivable, Excluding Accrued Interest, Revolving		6,709		6,709		9,986
Loans		12,051		12,051		15,414
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		168		168		220
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		395		395		116
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		87		87		70
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		110
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		61		61		12
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		8		8		9
Financing Receivable, Excluding Accrued Interest, Revolving		20		20		0
Loans		739		739		537
Commercial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0		68
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		328		328		100
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		164		164		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		86
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		75		75		210
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		153		153		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		720		720		464
Municipal loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		11,835		11,835		65,258
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		62,834		62,834		74,617
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		72,572		72,572		57,147
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		52,677		52,677		48,144
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		44,579		44,579		24,979
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		190,714		190,714		179,922
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		435,211		435,211		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	0	0
Municipal loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		11,835		11,835		65,258
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		62,834		62,834		74,617
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		72,572		72,572		57,147
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		52,677		52,677		47,636
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		44,579		44,579		24,576
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		190,714		190,714		173,919
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		435,211		435,211		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		508
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		403
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		6,003
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		0		0		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		0		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		0		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		0		0		0
Loans to individuals
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		14,071		14,071		29,586
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		21,029		21,029		21,481
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		15,895		15,895		12,651
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		9,246		9,246		5,285
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		3,304		3,304		1,705
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		1,411		1,411		1,010
Financing Receivable, Excluding Accrued Interest, Revolving		2,582		2,582		2,935
Loans		67,538		67,538		74,653
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	[1]			729
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff				31
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff				22
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff				6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff				2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff				77
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff				0
Loans charged-off		392	$ 433	867	$ 857
Loans to individuals | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		14,071		14,071		29,579
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		21,029		21,029		21,480
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		15,872		15,872		12,651
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		9,246		9,246		5,261
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		3,284		3,284		1,665
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		1,410		1,410		1,005
Financing Receivable, Excluding Accrued Interest, Revolving		2,582		2,582		2,935
Loans		67,494		67,494		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		1		1		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		1		1		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		0		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		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		17		17		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		20		20		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		2
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		37		37		9
Loans to individuals | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0		0		7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		6		6		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0		0		18
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		40
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0		0		3
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		$ 6		6		$ 68
Demand Deposit Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff				$ 729
[1]Includes $729,000 in charged off demand deposit overdrafts reported as 2023 originations.

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses - Aging of Past Due Loans by Class of Loan (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans	$ 4,329,043	$ 4,147,691
Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	4,323,010	4,141,558
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,216	4,395
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,955	822
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	862	916
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,033	6,133
Construction Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	657,354	559,681
Construction Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	657,090	559,617
Construction Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	122	43
Construction Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	6	21
Construction Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	136	0
Construction Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	264	64
1-4 Family Residential Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	684,878	663,519
1-4 Family Residential Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	681,516	659,408
1-4 Family Residential Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,406	3,529
1-4 Family Residential Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,371	368
1-4 Family Residential Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	585	214
1-4 Family Residential Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,362	4,111
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	2,100,338	1,987,707
Commercial Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	2,099,449	1,987,034
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	708	105
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	143	153
Commercial Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	38	415
Commercial Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	889	673
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans	383,724	412,064
Commercial loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	382,612	411,025
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	593	515
Commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	416	277
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	103	247
Commercial loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,112	1,039
Municipal loans
Financing Receivable, Past Due [Line Items]
Loans	435,211	450,067
Municipal loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	435,211	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	67,538	74,653
Loans to individuals | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	67,132	74,407
Loans to individuals | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	387	203
Loans to individuals | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	19	3
Loans to individuals | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	40
Loans to individuals | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	$ 406	$ 246

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Nonperforming Assets by Asset Class (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Nonperforming Assets [Line Items]
Restructured loans			$ 897
Extended Amortization Period
Nonperforming Assets [Line Items]
Restructured loans		$ 314
Commercial loans | Extended Amortization Period
Nonperforming Assets [Line Items]
Restructured loans		314
Nonperforming Assets
Nonperforming Assets [Line Items]
Nonaccrual loans	[1]	3,017	2,846
Accruing loans past due more than 90 days		0	0
Restructured loans	[2]	0	7,849
OREO		0	93
Repossessed assets		42	74
Total nonperforming assets		3,059	10,862
Nonperforming Assets | Construction Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		521	405
Nonperforming Assets | 1-4 Family Residential Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		1,005	848
Nonperforming Assets | Commercial Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		554	762
Nonperforming Assets | Commercial loans
Nonperforming Assets [Line Items]
Nonaccrual loans		930	757
Nonperforming Assets | Loans to individuals
Nonperforming Assets [Line Items]
Nonaccrual loans		$ 7	$ 74
[1]Includes $314,000 and $897,000 of restructured loans as of June 30, 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.

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	$ 36,332	$ 35,524	$ 36,515	$ 35,273
Loans charged-off	(737)	(479)	(1,370)	(1,034)
Recoveries of loans charged-off	430	516	792	1,056
Net loans (charged-off) recovered	(307)	37	(578)	22
Provision for (reversal of) loan losses	278	(112)	366	154
Balance at end of period	36,303	35,449	36,303	35,449
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	3,152	3,604	3,164	3,787
Loans charged-off	(63)	0	(63)	0
Recoveries of loans charged-off	0	1	1	1
Net loans (charged-off) recovered	(63)	1	(62)	1
Provision for (reversal of) loan losses	306	(206)	293	(389)
Balance at end of period	3,395	3,399	3,395	3,399
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,314	1,982	2,173	1,866
Loans charged-off	(22)	0	(71)	0
Recoveries of loans charged-off	41	53	46	92
Net loans (charged-off) recovered	19	53	(25)	92
Provision for (reversal of) loan losses	327	(11)	512	66
Balance at end of period	2,660	2,024	2,660	2,024
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	28,721	27,225	28,701	26,980
Loans charged-off	0	0	0	0
Recoveries of loans charged-off	1	34	1	81
Net loans (charged-off) recovered	1	34	1	81
Provision for (reversal of) loan losses	(710)	(38)	(690)	160
Balance at end of period	28,012	27,221	28,012	27,221
Commercial loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	1,901	2,454	2,235	2,397
Loans charged-off	(260)	(46)	(369)	(177)
Recoveries of loans charged-off	143	114	203	330
Net loans (charged-off) recovered	(117)	68	(166)	153
Provision for (reversal of) loan losses	233	36	(52)	8
Balance at end of period	2,017	2,558	2,017	2,558
Municipal loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	44	48	45	47
Loans charged-off	0	0	0	0
Recoveries of loans charged-off	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Provision for (reversal of) loan losses	(7)	(2)	(8)	(1)
Balance at end of period	37	46	37	46
Loans to individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	200	211	197	196
Loans charged-off	(392)	(433)	(867)	(857)
Recoveries of loans charged-off	245	314	541	552
Net loans (charged-off) recovered	(147)	(119)	(326)	(305)
Provision for (reversal of) loan losses	129	109	311	310
Balance at end of period	$ 182	$ 201	$ 182	$ 201

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) loans	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) loans	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 54		$ 54		$ 0
Reversal of interest income on nonaccrual loans	11	$ 24	30	$ 35
Nonaccrual loans, no allowance	1,200		1,200		1,600
Collateral-dependent loans	7,900		7,900		8,100
Restructured loans					897
Accrued interest receivable on our loan portfolio	18,500		18,500		$ 18,800
Extended Amortization Period
Financing Receivable, Allowance for Credit Loss [Line Items]
Restructured loans			$ 314
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term			20 years
Owner and nonowner-occupied real estate	1,730,000		$ 1,730,000
Loans secured by multi-family properties	338,100		338,100
Loans secured by farmland	$ 27,800		$ 27,800
Commercial loans | Extended Amortization Period
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loans modified | loans	2		2
Restructured loans			$ 314
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

Borrowing Arrangements (Details

Borrowing Arrangements (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Other borrowings		$ 500,341	$ 221,153
FHLB borrowings		183,007	153,358
Other borrowings:
Debt Instrument [Line Items]
Other borrowings		500,341	221,153
Average amount outstanding during the period	[1]	467,205	77,845
Maximum amount outstanding during the period	[2]	$ 1,030,421	$ 316,563
Weighted average interest rate during the period	[3]	4.60%	2.40%
Interest rate at end of the period	[4]	4.50%	4.10%
FHLB borrowings:
Debt Instrument [Line Items]
FHLB borrowings		$ 183,007	$ 153,358
Average amount outstanding during the period	[1]	307,221	135,926
Maximum amount outstanding during the period	[2]	$ 533,242	$ 423,645
Weighted average interest rate during the period	[3]	2.70%	2.40%
Interest rate at end of the period	[5]	0.90%	0.70%
[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.

Borrowings Maturities Table (De

Borrowings Maturities Table (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Debt Instrument [Line Items]
Less than 1 Year	$ 676,105
1-2 Years	4,367
2-3 Years	2,029
3-4 Years	396
4-5 Years	416
Thereafter	35
Total	683,348
Other borrowings:
Debt Instrument [Line Items]
Less than 1 Year	495,380
1-2 Years	3,611
2-3 Years	1,350
3-4 Years	0
4-5 Years	0
Thereafter	0
Total	500,341
FHLB borrowings:
Debt Instrument [Line Items]
Less than 1 Year	180,725
1-2 Years	756
2-3 Years	679
3-4 Years	396
4-5 Years	416
Thereafter	35
Total	$ 183,007

Borrowing Arrangements Narrativ

Borrowing Arrangements Narrative (Details)	6 Months Ended
	Jun. 30, 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	$ 104,200,000	33,200,000
Federal Home Loan Bank borrowings, additional funding available	1,800,000,000
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	593,600,000
Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Additional funding available	$ 708,000
Minimum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	3.73%
Federal Home Loan Bank borrowings maturities	20 days
Maximum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	5.53%
Federal Home Loan Bank borrowings maturities	5 years
Federal Reserve Discount Window
Line of Credit Facility [Line Items]
Other borrowings	$ 100,000,000	$ 188,000,000
Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Other borrowings	$ 296,200,000

Long-term Debt Other Long-term

Long-term Debt Other Long-term Debt (Details) - USD ($) $ in Thousands

6 Months Ended

Jun. 30, 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]

$ 93,796

$ 98,674

Trust preferred subordinated debentures

[2]

60,267

60,265

Total long-term debt

154,063

158,939

Southside Statutory Trust III, net of unamortized debt issuance costs

Debt Instruments [Abstract]

Trust preferred subordinated debentures

20,575

[2],[3]

20,573

[2],[3]

$ 20,619

Unamortized Debt Issuance Expense

44

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]

93,796

98,674

Unamortized Debt Issuance Expense

$ 1,200

$ 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 $44,000 at June 30, 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 $1.2 million at June 30, 2023 and $1.3 million at December 31, 2022.

Long-term Debt LT Debt Interest

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

Jun. 30, 2023

Jun. 14, 2023

Dec. 31, 2022

Nov. 06, 2020

Oct. 10, 2007

Debt Instrument [Line Items]

Other long-term debt

[1]

$ 60,267

$ 60,265

Southside Statutory Trust III (2)

Debt Instrument [Line Items]

Other long-term debt

$ 20,619

20,575

[1],[2]

20,573

[1],[2]

Southside Statutory Trust III (2) | Three-Month London Interbank Offered Rate (LIBOR)

Debt Instrument [Line Items]

Basis on variable rate

[3]

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

[3]

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

[3]

2.25%

Magnolia Trust Company I

Debt Instrument [Line Items]

Other long-term debt

$ 3,609

[4]

$ 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

[3],[4]

1.80%

3.875% Subordinated Notes

Debt Instrument [Line Items]

Debt face amount

[5]

$ 100,000

Stated interest rate

3.875%

3.875%

Debt instrument repurchase

$ 5,000

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 $44,000 at June 30, 2023 and $46,000 at December 31, 2022.[3]Effective July 1, 2023, the Company began utilizing SOFR to reset rates on our floating rate trust preferred subordinated debentures, due to the fact that LIBOR ceased to be published as of June 30, 2023.[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]On June 14, 2023, the Company repurchased $5.0 million of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030.

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 961	$ 691	$ 1,886	$ 1,371
Expected return on assets	(1,144)	(1,462)	(2,287)	(2,923)
Net loss amortization	197	169	363	320
Net periodic benefit cost (income)	14	(602)	(38)	(1,232)
Retirement Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Interest cost	31	25	63	51
Expected return on assets	(46)	(57)	(93)	(116)
Net loss amortization	0	0	0	0
Net periodic benefit cost (income)	(15)	(32)	(30)	(65)
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	209	150	415	289
Expected return on assets	0	0	0	0
Net loss amortization	8	72	15	127
Net periodic benefit cost (income)	$ 217	$ 222	$ 430	$ 416

Employee Benefit Plans Narrativ

Employee Benefit Plans Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Noncash adjustment to employee benefit plan liabilities, consisting of changes in net loss	$ 378	$ 447

Derivative Financial Instrume_3

Derivative Financial Instruments and Hedging Activities - Schedule Of Derivative Instruments (Details) - USD ($)		Jun. 30, 2023	Dec. 31, 2022
Asset Derivative
Gross derivatives		$ 87,699,000	$ 82,306,000
Offsetting derivative assets		0	(171,000)
Cash collateral received/posted		(78,260,000)	(82,135,000)
Net derivatives included in the consolidated balance sheets	[1]	9,439,000	0
Liability Derivative
Gross derivatives		21,282,000	21,217,000
Offsetting derivative liabilities		0	(171,000)
Cash collateral received/posted		0	0
Net derivatives included in the consolidated balance sheets	[1]	21,282,000	21,046,000
Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		760,000,000
Financial Institution Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		9,400,000	0
Financial Institution Counterparties | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	760,000,000	575,000,000
Asset Derivative
Gross derivatives		38,507,000	39,527,000
Liability Derivative
Gross derivatives		0	0
Financial Institution Counterparties | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	654,870,000	742,675,000
Asset Derivative
Gross derivatives		27,910,000	21,733,000
Liability Derivative
Gross derivatives		0	171,000
Financial Institution Counterparties | Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	218,901,000	223,124,000
Asset Derivative
Gross derivatives		21,282,000	21,046,000
Liability Derivative
Gross derivatives		0	0
Customer Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		0	0
Customer Counterparties | Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	218,901,000	223,124,000
Asset Derivative
Gross derivatives		0	0
Liability Derivative
Gross derivatives		$ 21,282,000	$ 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 $9.4 million credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at June 30, 2023. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at 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.

Derivative Financial Instrume_4

Derivative Financial Instruments and Hedging Activities - Weighted Average Remaining Maturity, Lives, and Rates of Interest Rate Swaps (Details) - Interest Rate Swap - USD ($)		6 Months Ended	12 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		$ 760,000,000
Financial Institution Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 218,901,000	$ 223,124,000
Remaining Maturity		8 years 7 months 6 days	9 years
Weighted Average Receive Rate		5.71%	4.83%
Weighted Average Pay Rate		2.67%	2.69%
Financial Institution Counterparties | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 760,000,000	$ 575,000,000
Remaining Maturity		2 years 7 months 6 days	2 years 3 months 18 days
Weighted Average Receive Rate		5.23%	4.44%
Weighted Average Pay Rate		2.02%	1.13%
Financial Institution Counterparties | Fair Value Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 654,870,000	$ 742,675,000
Remaining Maturity		5 years 9 months 18 days	6 years 3 months 18 days
Weighted Average Receive Rate		4.91%	3.42%
Weighted Average Pay Rate		3.19%	3.21%
Customer Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 218,901,000	$ 223,124,000
Remaining Maturity		8 years 7 months 6 days	9 years
Weighted Average Receive Rate		2.67%	2.69%
Weighted Average Pay Rate		5.71%	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.

Derivative Financial Instrume_5

Derivative Financial Instruments and Hedging Activities - Narrative (Details)	Jun. 30, 2023 USD ($) derivative_instrument	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Securities AFS, at estimated fair value	$ 1,339,821,000	$ 1,299,014,000
Cash collateral received from counterparties under master netting agreements	78,260,000	$ 82,135,000
Fair Value Hedging
Derivative [Line Items]
Securities AFS, at estimated fair value	$ 661,100,000
Interest Rate Swap | Designated as Hedging Instrument
Derivative [Line Items]
Number of instruments terminated | derivative_instrument	1
Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount	$ 760,000,000

Fair Value Measurement - Recurr

Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 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 $1,409,568 and $1,387,874, respectively)		$ 1,339,821	$ 1,299,014
Derivative assets	[1]	9,439	0
Derivative liabilities	[1]	21,282	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 $1,409,568 and $1,387,874, respectively)		298,998
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 $1,409,568 and $1,387,874, respectively)		770,283	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 $1,409,568 and $1,387,874, respectively)		12,991	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 $1,409,568 and $1,387,874, respectively)	[2]	247,233	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 $1,409,568 and $1,387,874, respectively)	[2]	10,316	10,431
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments		5,235	5,235
Total asset fair value measurements		1,432,755	1,386,555
Total liability fair value measurements		21,282	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 $1,409,568 and $1,387,874, respectively)		298,998
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 $1,409,568 and $1,387,874, respectively)		770,283	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 $1,409,568 and $1,387,874, respectively)		12,991	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 $1,409,568 and $1,387,874, respectively)	[3]	247,233	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 $1,409,568 and $1,387,874, respectively)	[3]	10,316	10,431
Fair Value, Recurring | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		87,699	82,306
Derivative liabilities		21,282	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		5,235	5,235
Total asset fair value measurements		304,233	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 $1,409,568 and $1,387,874, respectively)		298,998
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 $1,409,568 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 $1,409,568 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 $1,409,568 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 $1,409,568 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		1,128,522	1,381,320
Total liability fair value measurements		21,282	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 $1,409,568 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 $1,409,568 and $1,387,874, respectively)		770,283	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 $1,409,568 and $1,387,874, respectively)		12,991	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 $1,409,568 and $1,387,874, respectively)	[3]	247,233	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 $1,409,568 and $1,387,874, respectively)	[3]	10,316	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		87,699	82,306
Derivative liabilities		21,282	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 $1,409,568 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 $1,409,568 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 $1,409,568 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 $1,409,568 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 $1,409,568 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		42	167
Total asset fair value measurements		7,581	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]	7,539	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		42	167
Total asset fair value measurements		7,581	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]	$ 7,539	$ 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 $9.4 million credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at June 30, 2023. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at 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.

Fair Value Measurement - Balanc

Fair Value Measurement - Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 207,113	$ 199,252
Investment securities:
HTM, at carrying value	1,184,922	1,190,108
Mortgage-backed securities:
HTM, at carrying value	123,550	136,621
FHLB stock, at cost	10,801	9,190
Equity investments	4,337	5,946
Loans, net of allowance for loan losses	4,292,740	4,111,176
Loans held for sale	1,666	667
Financial liabilities:
Deposits	6,117,687	6,198,019
Other borrowings	500,341	221,153
FHLB borrowings	183,007	153,358
Subordinated notes, net of unamortized debt issuance costs	93,796	98,674
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,267	60,265
Estimated Fair Value
Financial assets:
Cash and cash equivalents	207,113	199,252
Investment securities:
HTM, at carrying value	1,035,925	1,023,376
Mortgage-backed securities:
HTM, at carrying value	112,890	125,780
FHLB stock, at cost	10,801	9,190
Equity investments	4,337	5,946
Loans, net of allowance for loan losses	3,989,515	3,880,664
Loans held for sale	1,666	667
Financial liabilities:
Deposits	6,081,139	6,158,517
Other borrowings	502,199	221,153
FHLB borrowings	169,942	140,976
Subordinated notes, net of unamortized debt issuance costs	85,323	91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs	54,964	60,594
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	207,113	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	1,035,925	1,023,376
Mortgage-backed securities:
HTM, at carrying value	112,890	125,780
FHLB stock, at cost	10,801	9,190
Equity investments	4,337	5,946
Loans, net of allowance for loan losses	0	0
Loans held for sale	1,666	667
Financial liabilities:
Deposits	6,081,139	6,158,517
Other borrowings	502,199	221,153
FHLB borrowings	169,942	140,976
Subordinated notes, net of unamortized debt issuance costs	85,323	91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs	54,964	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	3,989,515	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

Fair Value Measurement Narrativ

Fair Value Measurement Narrative (Details)	6 Months Ended
	Jun. 30, 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

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Current income tax expense	$ 4,690	$ 2,939	$ 9,427	$ 5,800
Deferred income tax expense (benefit)	(122)	358	(316)	643
Income tax expense	$ 4,568	$ 3,297	$ 9,111	$ 6,443

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Deferred tax assets, net	$ 29,200,000		$ 29,200,000		$ 34,700,000
Deferred tax assets, valuation allowance	0		0		$ 0
Income tax expense	$ 4,568,000	$ 3,297,000	$ 9,111,000	$ 6,443,000
Effective income tax rate, percent	15.50%	11.50%	15.20%	11.30%

Off-Balance-Sheet Arrangement_3

Off-Balance-Sheet Arrangements, Allowance for off-balance-sheet credit exposures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 3,559	$ 2,412	$ 3,687	$ 2,384
Provision for (reversal of) off-balance-sheet credit exposures	(352)	(521)	(480)	(493)
Balance at end of period	$ 3,207	$ 1,891	$ 3,207	$ 1,891

Off-Balance-Sheet Arrangement_4

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 1,253,640	$ 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	1,240,994	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	$ 12,646	$ 26,844

Off-Balance-Sheet Arrangement_5

Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 411,000	$ 0	$ 603,000	$ 0
Operating lease ROU assets	15,273,000		15,273,000		$ 15,314,000
Unsettled trades to purchase securities	0	174,038,000	0	174,038,000	0
Unsettled trades to sell securities	31,548,000	$ 72,001,000	31,548,000	$ 72,001,000	0
Unsettled Issuances of Brokered CDs	$ 0		$ 0		$ 0