Southside Bancshares (SBSI) 10-Q 27 Oct 23 2023 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Oct. 24, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 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		30,196,614
Entity Central Index Key	0000705432
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks		$ 105,601	$ 106,143
Interest earning deposits		106,094	9,276
Federal funds sold		114,128	83,833
Total cash and cash equivalents		325,823	199,252
Securities AFS, at estimated fair value (amortized cost of $1,472,520 and $1,387,874, respectively)		1,335,560	1,299,014
Securities HTM (estimated fair value of $1,052,430 and $1,149,156, respectively)		1,307,886	1,326,729
FHLB stock, at cost		12,778	9,190
Equity investments		9,454	11,181
Loans held for sale		1,382	667
Loans:
Loans		4,420,633	4,147,691
Less: Allowance for loan losses		(41,760)	(36,515)
Net loans		4,378,873	4,111,176
Premises and equipment, net		139,473	141,256
Operating lease ROU assets		14,948	15,314
Goodwill		201,116	201,116
Other intangible assets, net		3,295	4,622
Interest receivable		39,646	49,350
Deferred tax asset, net		41,221	34,695
BOLI		135,737	133,911
Other assets		25,276	21,163
Total assets		7,972,468	7,558,636
Deposits:
Noninterest bearing		1,431,285	1,671,562
Interest bearing		4,918,286	4,526,457
Total deposits		6,349,571	6,198,019
Other borrowings		395,209	221,153
FHLB borrowings		212,829	153,358
Subordinated notes, net of unamortized debt issuance costs	[1]	93,838	98,674
Trust preferred subordinated debentures, net of unamortized debt issuance costs		60,269	60,265
Unsettled trades to purchase securities		24,917	0
Operating lease liabilities		16,797	17,070
Other liabilities		90,443	64,100
Total liabilities		7,243,873	6,812,639
Off-balance-sheet arrangements, commitments and contingencies (Note 12)
Shareholders’ equity:
Common stock:  ($1.25 par value, 80,000,000 shares authorized, 38,029,245 shares issued at September 30, 2023 and 38,000,822 shares issued at December 31, 2022)		47,537	47,501
Paid-in capital		788,190	784,545
Retained earnings		276,312	239,610
Treasury stock: (shares at cost, 7,691,151 at September 30, 2023 and 6,454,192 at December 31, 2022)		(228,467)	(188,203)
AOCI		(154,977)	(137,456)
Total shareholders’ equity		728,595	745,997
Total liabilities and shareholders’ equity		$ 7,972,468	$ 7,558,636
[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	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Securities AFS, at estimated fair value	$ 1,472,520	$ 1,387,874
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held-to-maturity, fair value	$ 1,052,430	$ 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)	38,029,245	38,000,822
Shares purchased (in shares)	7,691,151	6,454,192

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income:
Loans	$ 64,110	$ 45,257	$ 177,570	$ 118,489
Taxable investment securities	8,731	4,896	23,216	14,136
Tax-exempt investment securities	13,758	11,482	41,394	32,306
MBS	4,426	4,770	12,585	12,025
FHLB stock and equity investments	265	101	889	291
Other interest earning assets	1,788	374	5,148	606
Total interest income	93,078	66,880	260,802	177,853
Interest expense:
Deposits	30,951	7,887	72,536	15,388
FHLB borrowings	1,174	1,078	5,347	1,668
Subordinated notes	962	1,004	2,955	3,002
Trust preferred subordinated debentures	1,178	669	3,309	1,496
Other borrowings	5,540	727	16,113	800
Total interest expense	39,805	11,365	100,260	22,354
Net interest income	53,273	55,515	160,542	155,499
Provision for (reversal of) credit losses	6,987	1,494	6,873	1,155
Net interest income after provision for credit losses	46,286	54,021	153,669	154,344
Noninterest income:
Deposit services	6,479	6,241	19,192	19,365
Net gain (loss) on sale of securities AFS	11	(99)	(5,590)	(3,819)
Net gain on sale of equity securities	0	0	5,058	0
Gain on sale of loans	96	109	385	495
Trust fees	1,522	1,407	4,479	4,421
BOLI	790	720	3,221	2,131
Brokerage services	760	701	2,361	2,608
Other	1,178	1,190	4,227	4,890
Total noninterest income	10,836	10,269	33,333	30,091
Noninterest expense:
Salaries and employee benefits	21,241	21,368	64,473	61,666
Net occupancy	3,796	3,847	11,220	11,157
Advertising, travel & entertainment	1,062	789	2,966	2,242
ATM expense	358	317	1,033	954
Professional fees	1,472	1,412	4,036	3,486
Software and data processing	2,432	1,736	6,751	5,106
Communications	359	497	1,034	1,509
FDIC insurance	902	485	2,666	1,434
Amortization of intangibles	407	550	1,327	1,758
Other	3,524	2,463	9,889	7,453
Total noninterest expense	35,553	33,464	105,395	96,765
Income before income tax expense	21,569	30,826	81,607	87,670
Income tax expense	3,120	3,875	12,231	10,318
Net income	$ 18,449	$ 26,951	$ 69,376	$ 77,352
Earnings per common share - basic (in dollars per share)	$ 0.60	$ 0.84	$ 2.25	$ 2.40
Earnings per common share - diluted (in dollars per share)	0.60	0.84	2.24	2.39
Cash dividends paid per common share (in dollars per share)	$ 0.35	$ 0.34	$ 1.05	$ 1.02

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 18,449	$ 26,951	$ 69,376	$ 77,352
Securities AFS and transferred securities:
Change in unrealized holding gain (loss) on AFS securities during the period	(52,882)	(61,354)	(33,032)	(256,778)
Change in net unrealized loss on securities transferred from AFS to HTM	0	(6,367)	0	(97,871)
Reclassification adjustment for amortization related to AFS and HTM debt securities	2,008	1,396	5,989	2,949
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income	(11)	99	5,590	3,819
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	7,377	15,226	16,277	42,819
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges	(6,408)	(1,572)	(17,570)	94
Pension plans:
Amortization of net actuarial loss, included in net periodic benefit cost	189	224	567	671
Other comprehensive income (loss), before tax	(49,727)	(52,348)	(22,179)	(304,297)
Income tax (expense) benefit related to items of other comprehensive income (loss)	10,443	10,993	4,658	63,902
Other comprehensive income (loss), net of tax	(39,284)	(41,355)	(17,521)	(240,395)
Comprehensive income (loss)	$ (20,835)	$ (14,404)	$ 51,855	$ (163,043)

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	77,352
Other comprehensive income (loss)	(240,395)
Ending balance, net of tax at Sep. 30, 2022	707,636	47,490	783,803	224,142	(167,109)	(180,690)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,951			26,951
Other comprehensive income (loss)	(41,355)					(41,355)
Issuance of common stock for dividend reinvestment plan	278	9	269
Purchase of common stock	(309)				(309)
Stock compensation expense	760		760
Net issuance of common stock under employee stock plans	448		263	(61)	246
Cash dividends paid on common stock	(10,919)			(10,919)
Ending balance, net of tax at Sep. 30, 2022	707,636	47,490	783,803	224,142	(167,109)	(180,690)
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	69,376
Other comprehensive income (loss)	(17,521)
Ending balance, net of tax at Sep. 30, 2023	728,595	47,537	788,190	276,312	(228,467)	(154,977)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,449			18,449
Other comprehensive income (loss)	(39,284)					(39,284)
Issuance of common stock for dividend reinvestment plan	307	13	294
Purchase of common stock	(6,237)				(6,237)
Stock compensation expense	875		875
Net issuance of common stock under employee stock plans	11		(6)	(93)	110
Cash dividends paid on common stock	(10,687)			(10,687)
Ending balance, net of tax at Sep. 30, 2023	$ 728,595	$ 47,537	$ 788,190	$ 276,312	$ (228,467)	$ (154,977)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for dividend reinvestment plan (in shares)	10,007	10,390	8,026	7,372	7,717	7,671
Common stock purchased (in shares)	212,388	618,831	457,394	8,613	223,901	82,285
Net issuance of common stock under employee stock plans (in shares)	8,670	19,065	23,919	20,229	30,162	16,551
Cash dividends paid on common stock (in dollars per share)	$ 0.35	$ 0.35	$ 0.35	$ 0.34	$ 0.34	$ 0.34

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
OPERATING ACTIVITIES:
Net income	$ 69,376	$ 77,352
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	7,972	8,332
Securities premium amortization (discount accretion), net	3,791	13,861
Loan (discount accretion) premium amortization, net	296	(267)
Provision for (reversal of) credit losses	6,873	1,155
Stock compensation expense	2,713	2,426
Deferred tax expense (benefit)	(1,868)	103
Net (gain) loss on sale of AFS securities	5,590	3,819
Net (gain) loss on sale of equity securities	(5,058)	0
Loss on impairment of investments	0	38
Net loss on premises and equipment	106	435
Gross proceeds from sales of loans held for sale	12,941	20,195
Gross originations of loans held for sale	(13,656)	(18,932)
Net (gain) loss on OREO	(53)	(12)
Gain on purchase of subordinated notes	(587)	0
Net change in:
Interest receivable	9,704	6,231
Other assets	(5,665)	76,432
Interest payable	10,545	925
Other liabilities	33,434	16,271
Net cash provided by (used in) operating activities	136,454	208,364
Securities AFS:
Purchases	(1,137,694)	(697,393)
Sales	747,434	460,765
Maturities, calls and principal repayments	324,964	98,046
Securities HTM:
Purchases	0	(1,632)
Maturities, calls and principal repayments	21,010	11,020
Proceeds from sales of equity securities	6,679	0
Proceeds from redemption of FHLB stock and equity investments	30,767	26,623
Purchases of FHLB stock and equity investments	(34,249)	(24,346)
Net loan paydowns (originations)	(274,843)	(418,546)
Purchases of premises and equipment	(5,071)	(8,370)
Proceeds from BOLI	951	0
Proceeds from sales of premises and equipment	430	1,365
Net proceeds from sales of OREO	146	34
Proceeds from sales of repossessed assets	168	47
Net cash provided by (used in) investing activities	(319,308)	(552,387)
FINANCING ACTIVITIES:
Net change in deposits	151,446	430,321
Net change in other borrowings	174,056	51,502
Proceeds from FHLB borrowings	1,659,000	2,501,000
Repayment of FHLB borrowings	(1,599,529)	(2,601,507)
Purchase of subordinated notes	(4,365)	0
Proceeds from stock option exercises	705	912
Cash paid to tax authority related to tax withholding on share-based awards	(281)	(407)
Purchase of common stock	(40,120)	(12,509)
Proceeds from the issuance of common stock for dividend reinvestment plan	908	913
Cash dividends paid	(32,395)	(32,828)
Net cash provided by (used in) financing activities	309,425	337,397
Net increase (decrease) in cash and cash equivalents	126,571	(6,626)
Cash and cash equivalents at beginning of period	199,252	201,753
Cash and cash equivalents at end of period	325,823	195,127
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	89,715	21,428
Income taxes paid	12,250	8,200
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	127	266
Transfer of AFS to HTM securities	0	1,166,550
Unsettled trades to purchase securities	24,917	0
Unsettled trades to repurchase common stock	541	0
Unsettled issuances of brokered CDs	$ 0	$ 28,481

Summary of Significant Accounti

Summary of Significant Accounting and Reporting Policies	9 Months Ended
	Sep. 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

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 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 Nine Months Ended 2023 2022 2023 2022 Basic and Diluted Earnings: Net income $ 18,449 $ 26,951 $ 69,376 $ 77,352 Basic weighted-average shares outstanding 30,502 32,112 30,862 32,195 Add: Stock awards 41 109 54 146 Diluted weighted-average shares outstanding 30,543 32,221 30,916 32,341 Basic earnings per share: Net income $ 0.60 $ 0.84 $ 2.25 $ 2.40 Diluted earnings per share: Net income $ 0.60 $ 0.84 $ 2.24 $ 2.39 For the three and nine months ended September 30, 2023, there were approximately 611,000 and 571,000 anti-dilutive shares, respectively. For the three months ended September 30, 2022, there were 22,000 anti-dilutive shares. For the nine months ended September 30, 2022 there were no anti-dilutive shares.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 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 September 30, 2023 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (125,929) $ 29,439 $ (19,203) $ (115,693) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications (52,882) 7,377 — (45,505) Reclassification adjustments included in net income 1,997 (6,408) 189 (4,222) Income tax (expense) benefit 10,686 (203) (40) 10,443 Net current-period other comprehensive income (loss), net of tax (40,199) 766 149 (39,284) Ending balance, net of tax $ (166,128) $ 30,205 $ (19,054) $ (154,977) Nine Months Ended September 30, 2023 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (149,181) $ 31,227 $ (19,502) $ (137,456) Other comprehensive income (loss): Other comprehensive (loss) income before reclassifications (33,032) 16,277 — (16,755) Reclassification adjustments included in net income 11,579 (17,570) 567 (5,424) Income tax (expense) benefit 4,506 271 (119) 4,658 Net current-period other comprehensive income (loss), net of tax (16,947) (1,022) 448 (17,521) Ending balance, net of tax $ (166,128) $ 30,205 $ (19,054) $ (154,977) Three Months Ended September 30, 2022 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (137,792) $ 21,857 $ (23,400) $ (139,335) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications (67,721) 15,226 — (52,495) Reclassification adjustments included in net income 1,495 (1,572) 224 147 Income tax (expense) benefit 13,908 (2,868) (47) 10,993 Net current-period other comprehensive income (loss), net of tax (52,318) 10,786 177 (41,355) Ending balance, net of tax $ (190,110) $ 32,643 $ (23,223) $ (180,690) Nine Months Ended September 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 (354,649) 42,819 — (311,830) Reclassification adjustments included in net income 6,768 94 671 7,533 Income tax (expense) benefit 73,055 (9,013) (140) 63,902 Net current-period other comprehensive income (loss), net of tax (274,826) 33,900 531 (240,395) Ending balance, net of tax $ (190,110) $ 32,643 $ (23,223) $ (180,690) The reclassification adjustments out of accumulated other comprehensive income (loss) included in net income are presented below (in thousands): Three Months Ended Nine Months Ended 2023 2022 2023 2022 Unrealized gains and losses on securities transferred: Amortization of unrealized gains and losses (1) $ (2,008) $ (1,396) $ (5,989) $ (2,949) Tax benefit 422 293 1,258 619 Net of tax (1,586) (1,103) (4,731) (2,330) Unrealized gains and losses on available for sale securities: Realized net gain (loss) on sale of securities (2) 11 (99) (5,590) (3,819) Tax (expense) benefit (2) 21 1,174 802 Net of tax 9 (78) (4,416) (3,017) Derivatives: Realized net gain (loss) on interest rate swap derivatives (3) 6,408 1,572 17,570 (94) Tax benefit (1,346) (330) (3,690) 20 Net of tax 5,062 1,242 13,880 (74) Amortization of pension plan: Net actuarial loss (4) (189) (224) (567) (671) Tax benefit 40 47 119 140 Net of tax (149) (177) (448) (531) Total reclassifications for the period, net of tax $ 3,336 $ (116) $ 4,285 $ (5,952) (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	9 Months Ended
	Sep. 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 September 30, 2023 and December 31, 2022 are reflected in the tables below (in thousands): September 30, 2023 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 224,174 $ 35 $ — $ 224,209 State and political subdivisions 822,753 14 114,224 708,543 Corporate bonds and other 14,550 19 1,173 13,396 MBS: (1) Residential 399,943 305 20,861 379,387 Commercial 11,100 — 1,075 10,025 Total $ 1,472,520 $ 373 $ 137,333 $ 1,335,560 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,038,934 $ — $ 225,921 $ 813,013 Corporate bonds and other 146,540 313 15,280 131,573 MBS: (1) Residential 91,954 1 11,305 80,650 Commercial 30,458 — 3,264 27,194 Total $ 1,307,886 $ 314 $ 255,770 $ 1,052,430 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 nine months ended September 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 $115.6 million ($91.3 million, net of tax) at September 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 $2.48 billion and $1.82 billion were pledged as of September 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 September 30, 2023 and December 31, 2022, segregated by major security type and length of time in a continuous loss position (in thousands): September 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 $ 115,067 $ 6,434 $ 591,566 $ 107,790 $ 706,633 $ 114,224 Corporate bonds and other 12,500 1,166 689 7 13,189 1,173 MBS: Residential 157,854 2,226 191,521 18,635 349,375 20,861 Commercial 2,178 43 7,847 1,032 10,025 1,075 Total $ 287,599 $ 9,869 $ 791,623 $ 127,464 $ 1,079,222 $ 137,333 HELD TO MATURITY Investment securities: State and political subdivisions $ 186,212 $ 13,551 $ 626,801 $ 212,370 $ 813,013 $ 225,921 Corporate bonds and other 13,595 1,425 111,451 13,855 125,046 15,280 MBS: Residential 523 2 80,024 11,303 80,547 11,305 Commercial — — 27,194 3,264 27,194 3,264 Total $ 200,330 $ 14,978 $ 845,470 $ 240,792 $ 1,045,800 $ 255,770 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 MBS: 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 September 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 September 30, 2023, we had 585 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 nine months ended September 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 September 30, 2023, accrued interest receivable on AFS and HTM debt securities totaled $10.8 million and $8.5 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 September 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 $ 3,784 $ 44 State and political subdivisions 16,940 14,666 Corporate bonds and other 1,765 1,668 MBS 4,426 4,770 Total interest income on securities $ 26,915 $ 21,148 Nine Months Ended 2023 2022 U.S. Treasury $ 8,307 $ 271 State and political subdivisions 50,940 41,786 Corporate bonds and other 5,363 4,385 MBS 12,585 12,025 Total interest income on securities $ 77,195 $ 58,467 There was a $5.6 million net realized loss as a result of sales from the AFS securities portfolio for the nine months ended September 30, 2023, which consisted of $7.0 million in realized losses and $1.4 million in realized gains. There was a $3.8 million net realized loss as a result of sales from the AFS securities portfolio for the nine months ended September 30, 2022, which consisted of $4.4 million in realized losses and $584,000 in realized gains. There were no sales from the HTM portfolio during the three and nine months ended September 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 September 30, 2023, are presented below by contractual maturity (in thousands): September 30, 2023 Amortized Cost Fair Value AVAILABLE FOR SALE Investment securities: Due in one year or less $ 224,385 $ 224,420 Due after one year through five years 4,266 4,193 Due after five years through ten years 33,991 32,127 Due after ten years 798,835 685,408 1,061,477 946,148 MBS: 411,043 389,412 Total $ 1,472,520 $ 1,335,560 September 30, 2023 Amortized Cost Fair Value HELD TO MATURITY Investment securities: Due in one year or less $ 15,962 $ 15,281 Due after one year through five years 4,861 4,684 Due after five years through ten years 140,605 125,451 Due after ten years 1,024,046 799,170 1,185,474 944,586 MBS: 122,412 107,844 Total $ 1,307,886 $ 1,052,430 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 September 30, 2023 and December 31, 2022, we had equity investments recorded in our consolidated balance sheets of $9.5 million and $11.2 million, respectively. Any realized and unrealized gains and losses on equity investments are reported in income. Equity investments without readily determinable fair values are recorded at cost less impairment, if any. For the three months ended September 30, 2023, there was no gain or loss on the sale of equity securities. For the nine months ended September 30, 2023, there was a net gain on the sale of equity securities of $5.1 million. The following is a summary of unrealized and realized gains and losses on equity investments recognized in other noninterest income in the consolidated statements of income during the periods presented (in thousands): Three Months Ended Nine Months Ended 2023 2022 2023 2022 Net gains (losses) recognized during the period on equity investments $ (163) $ (230) $ 4,895 $ (696) Less: Net gains recognized during the period on equity investments sold during the period — — 5,058 — Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date $ (163) $ (230) $ (163) $ (696) Equity investments are assessed quarterly for other-than-temporary impairment. Based upon that evaluation, management does not consider any of our equity investments to be other-than-temporarily impaired at September 30, 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 September 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	9 Months Ended
	Sep. 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): September 30, 2023 December 31, 2022 Real estate loans: Construction $ 720,515 $ 559,681 1-4 family residential 689,492 663,519 Commercial 2,117,306 1,987,707 Commercial loans 385,816 412,064 Municipal loans 441,512 450,067 Loans to individuals 65,992 74,653 Total loans 4,420,633 4,147,691 Less: Allowance for loan losses 41,760 36,515 Net loans $ 4,378,873 $ 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 September 30, 2023 consisted of $1.75 billion of owner and non-owner occupied real estate, $339.4 million of loans secured by multi-family properties and $29.4 million of loans secured by farmland. Commercial real estate loans primarily include loans collateralized by retail, commercial office buildings, multi-family residential buildings, medical facilities and offices, senior living, assisted living and skilled nursing facilities, warehouse facilities, hotels and churches. 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): September 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 $ 109,018 $ 225,290 $ 191,843 $ 33,111 $ 3,009 $ 6,753 $ 128,083 $ 697,107 Pass watch — — — — — — 9,544 9,544 Special mention 171 13,303 188 — 8 — — 13,670 Substandard — 73 — — — 80 — 153 Doubtful — — 41 — — — — 41 Total construction real estate $ 109,189 $ 238,666 $ 192,072 $ 33,111 $ 3,017 $ 6,833 $ 137,627 $ 720,515 Current period gross charge-offs $ — $ 63 $ — $ — $ — $ — $ — $ 63 1-4 family residential real estate: Pass $ 36,549 $ 114,435 $ 143,340 $ 119,327 $ 64,791 $ 202,168 $ 1,858 $ 682,468 Pass watch — — — 34 — — — 34 Special mention — — — 1,090 — 1,348 — 2,438 Substandard 155 — 76 378 53 3,479 57 4,198 Doubtful — — — — — 354 — 354 Total 1-4 family residential real estate $ 36,704 $ 114,435 $ 143,416 $ 120,829 $ 64,844 $ 207,349 $ 1,915 $ 689,492 Current period gross charge-offs $ — $ — $ — $ — $ — $ 71 $ — $ 71 Commercial real estate: Pass $ 338,060 $ 708,281 $ 501,231 $ 148,979 $ 92,448 $ 203,242 $ 15,583 $ 2,007,824 Pass watch 39,704 9,530 1,846 632 338 148 — 52,198 Special mention 2,015 871 — — 7,761 25,347 — 35,994 Substandard — — 281 269 14,206 6,377 — 21,133 Doubtful — — — — 70 87 — 157 Total commercial real estate $ 379,779 $ 718,682 $ 503,358 $ 149,880 $ 114,823 $ 235,201 $ 15,583 $ 2,117,306 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial loans: Pass $ 54,023 $ 78,551 $ 58,150 $ 12,486 $ 5,107 $ 4,038 $ 170,437 $ 382,792 Pass watch 26 40 125 — — 20 — 211 Special mention — 176 — 20 — 177 780 1,153 Substandard 205 443 89 — 92 6 — 835 Doubtful — 395 106 — 102 120 102 825 Total commercial loans $ 54,254 $ 79,605 $ 58,470 $ 12,506 $ 5,301 $ 4,361 $ 171,319 $ 385,816 Current period gross charge-offs $ 575 $ 439 $ 44 $ 26 $ 23 $ 6 $ — $ 1,113 Municipal loans: Pass $ 30,063 $ 62,250 $ 70,471 $ 50,793 $ 42,340 $ 185,595 $ — $ 441,512 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 30,063 $ 62,250 $ 70,471 $ 50,793 $ 42,340 $ 185,595 $ — $ 441,512 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 20,845 $ 17,948 $ 13,536 $ 7,550 $ 2,698 $ 1,169 $ 2,207 $ 65,953 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — 14 — — 14 Doubtful — — 5 — — 11 9 25 Total loans to individuals $ 20,845 $ 17,948 $ 13,541 $ 7,550 $ 2,712 $ 1,180 $ 2,216 $ 65,992 Current period gross charge-offs (1) $ 1,218 $ 34 $ 39 $ 12 $ 3 $ 79 $ — $ 1,385 Total loans $ 630,834 $ 1,231,586 $ 981,328 $ 374,669 $ 233,037 $ 640,519 $ 328,660 $ 4,420,633 Total current period gross charge-offs (1) $ 1,793 $ 536 $ 83 $ 38 $ 26 $ 156 $ — $ 2,632 (1) Includes $1.2 million 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 Watch List loans reported as 2023 originations as of September 30, 2023 and Watch List 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): September 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 $ 175 $ — $ — $ 175 $ 720,340 $ 720,515 1-4 family residential 748 685 1,963 3,396 686,096 689,492 Commercial 2,331 41 36 2,408 2,114,898 2,117,306 Commercial loans 494 162 525 1,181 384,635 385,816 Municipal loans — — — — 441,512 441,512 Loans to individuals 140 11 — 151 65,841 65,992 Total $ 3,888 $ 899 $ 2,524 $ 7,311 $ 4,413,322 $ 4,420,633 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): September 30, 2023 December 31, 2022 Nonaccrual loans: Real estate loans: Construction $ 41 $ 405 1-4 family residential 2,365 848 Commercial 527 762 Commercial loans 1,358 757 Loans to individuals 25 74 Total nonaccrual loans (1) 4,316 2,846 Accruing loans past due more than 90 days — — Restructured loans (2) 15 7,849 OREO 50 93 Repossessed assets — 74 Total nonperforming assets $ 4,381 $ 10,862 (1) Includes $343,000 and $897,000 of restructured loans as of September 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 September 30, 2023 exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures. We reversed $13,000 and $78,000 of interest income on nonaccrual loans during the three and nine months ended September 30, 2023, respectively, and $10,000 and $33,000 for the three and nine months ended September 30, 2022, respectively. We had $1.0 million and $1.6 million of loans on nonaccrual for which there was no related allowance for credit losses as of September 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 September 30, 2023 and December 31, 2022, we had $7.7 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 $63,000 loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of September 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 nine months ended September 30, 2023 were not significant. The following tables set forth the recorded balance of restructured loans and type of modification by class of loans during the periods presented (dollars in thousands): Three Months Ended September 30, 2023 Amortization Interest Rate Reduction Combination Total Modifications Number of Loans Percent of Total Class Commercial loans $ 15 $ — $ 65 $ 80 2 0.02 % Total $ 15 $ — $ 65 $ 80 2 Nine Months Ended September 30, 2023 Amortization Interest Rate Reduction Combination Total Modifications Number of Loans Percent of Total Class Commercial loans $ 293 $ — $ 65 $ 358 4 0.09 % Total $ 293 $ — $ 65 $ 358 4 There were three restructured loans totaling $343,000 included in our nonaccrual loans in nonperforming assets as of September 30, 2023. 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 September 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 September 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 September 30, 2023 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,395 $ 2,660 $ 28,012 $ 2,017 $ 37 $ 182 $ 36,303 Loans charged-off — — — (744) — (518) (1,262) Recoveries of loans charged-off — 62 — 65 — 251 378 Net loans (charged-off) recovered — 62 — (679) — (267) (884) Provision for (reversal of) loan losses 1,019 17 4,327 731 (17) 264 6,341 Balance at end of period $ 4,414 $ 2,739 $ 32,339 $ 2,069 $ 20 $ 179 $ 41,760 Nine Months Ended September 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) — (1,113) — (1,385) (2,632) Recoveries of loans charged-off 1 108 1 268 — 792 1,170 Net loans (charged-off) recovered (62) 37 1 (845) — (593) (1,462) Provision for (reversal of) loan losses 1,312 529 3,637 679 (25) 575 6,707 Balance at end of period $ 4,414 $ 2,739 $ 32,339 $ 2,069 $ 20 $ 179 $ 41,760 Three Months Ended September 30, 2022 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,399 $ 2,024 $ 27,221 $ 2,558 $ 46 $ 201 $ 35,449 Loans charged-off — (66) — (192) — (428) (686) Recoveries of loans charged-off — 4 — 139 — 306 449 Net loans (charged-off) recovered — (62) — (53) — (122) (237) Provision for (reversal of) loan losses 136 44 1,273 (272) (2) 115 1,294 Balance at end of period $ 3,535 $ 2,006 $ 28,494 $ 2,233 $ 44 $ 194 $ 36,506 Nine Months Ended September 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 — (66) — (369) — (1,285) (1,720) Recoveries of loans charged-off 1 96 81 469 — 858 1,505 Net loans (charged-off) recovered 1 30 81 100 — (427) (215) Provision for (reversal of) loan losses (253) 110 1,433 (264) (3) 425 1,448 Balance at end of period $ 3,535 $ 2,006 $ 28,494 $ 2,233 $ 44 $ 194 $ 36,506 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 September 30, 2023 and December 31, 2022, the accrued interest on our loan portfolio was $20.3 million and $18.8 million, respectively.

Borrowing Arrangements

Borrowing Arrangements	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Borrowing Arrangements	Borrowing Arrangements Information related to borrowings is provided in the table below (dollars in thousands): September 30, 2023 December 31, 2022 Other borrowings: Balance at end of period $ 395,209 $ 221,153 Average amount outstanding during the period (1) 451,966 77,845 Maximum amount outstanding during the period (2) 1,030,421 316,563 Weighted average interest rate during the period (3) 4.8 % 2.4 % Interest rate at end of period (4) 4.4 % 4.1 % FHLB borrowings: Balance at end of period $ 212,829 $ 153,358 Average amount outstanding during the period (1) 281,260 135,926 Maximum amount outstanding during the period (2) 533,242 423,645 Weighted average interest rate during the period (3) 2.5 % 2.4 % Interest rate at end of period (5) 1.4 % 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 September 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 $ 388,888 $ 6,321 $ — $ — $ — $ — $ 395,209 FHLB borrowings 210,733 764 582 401 349 — 212,829 Total obligations $ 599,621 $ 7,085 $ 582 $ 401 $ 349 $ — $ 608,038 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 September 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 September 30, 2023, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities, was approximately $636.9 million. There were no borrowings from the FRDW at September 30, 2023, and $188.0 million at December 31, 2022. To provide more stability and to assure banks have the ability to meet the needs of all of their depositors, the Federal Reserve created the BTFP in the first quarter of 2023. At September 30, 2023, the amount of additional funding the Bank could obtain from the BTFP, collateralized by securities, was approximately $6,000. There were $291.3 million in borrowings from the BTFP at September 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 September 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 $103.9 million at September 30, 2023 and $33.2 million at December 31, 2022, and had maturities of less than 2.0 years. Repurchase

Long-term Debt

Long-term Debt	9 Months Ended
	Sep. 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): September 30, 2023 December 31, 2022 Subordinated notes: (1) 3.875% Subordinated notes, net of unamortized debt issuance costs (2) $ 93,838 $ 98,674 Total Subordinated notes 93,838 98,674 Trust preferred subordinated debentures: (3) Southside Statutory Trust III, net of unamortized debt issuance costs (4) 20,577 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 60,269 60,265 Total Long-term debt $ 154,107 $ 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 September 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 $42,000 at September 30, 2023 and $46,000 at December 31, 2022. As of September 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 SOFR + 3.20% September 4, 2033 Southside Statutory Trust IV (2) August 8, 2007 $ 23,196 Floating 3 month SOFR + 1.56% October 30, 2037 Southside Statutory Trust V (2) August 10, 2007 $ 12,887 Floating 3 month SOFR + 2.51% September 15, 2037 Magnolia Trust Company I (2) (3) May 20, 2005 $ 3,609 Floating 3 month SOFR + 2.06% 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	9 Months Ended
	Sep. 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 September 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2023 2022 2023 2022 2023 2022 Interest cost $ 942 $ 685 $ 31 $ 25 $ 208 $ 144 Expected return on assets (1,143) (1,461) (47) (58) — — Net loss amortization 182 160 — — 7 64 Net periodic benefit cost (income) $ (19) $ (616) $ (16) $ (33) $ 215 $ 208 Nine Months Ended September 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2023 2022 2023 2022 2023 2022 Interest cost $ 2,828 $ 2,056 $ 94 $ 76 $ 623 $ 433 Expected return on assets (3,430) (4,384) (140) (174) — — Net loss amortization 545 480 — — 22 191 Net periodic benefit cost (income) $ (57) $ (1,848) $ (46) $ (98) $ 645 $ 624 The noncash adjustment to the employee benefit plan liabilities, consisting of changes in net loss, was $567,000 and $671,000 for the nine months ended September 30, 2023 and 2022, respectively.

Derivative Financial Instrument

Derivative Financial Instruments and Hedging Activities	9 Months Ended
	Sep. 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 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 that 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 September 30, 2023, hedged securities with a carrying amount of $609.1 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 affect 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 September 30, 2023 and December 31, 2022, net derivative assets included $109.5 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): September 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 $ 39,409 $ — $ 575,000 $ 39,527 $ — Swaps-Fair Value Hedge-Financial institution counterparties 654,870 42,229 — 742,675 21,733 171 Derivatives designated as non-hedging instruments Interest rate contracts: Swaps-Financial institution counterparties 216,777 27,876 — 223,124 21,046 — Swaps-Customer counterparties 216,777 — 27,876 223,124 — 21,046 Gross derivatives 109,514 27,876 82,306 21,217 Offsetting derivative assets/liabilities — — (171) (171) Cash collateral received/posted (109,514) — (82,135) — Net derivatives included in the consolidated balance sheets (2) $ — $ 27,876 $ — $ 21,046 (1) Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets. (2) Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at September 30, 2023 or December 31, 2022. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged. The summarized expected weighted average remaining maturity of the notional amount of interest rate swaps and the weighted average interest rates associated with the amounts expected to be received or paid on interest rate swap agreements are presented below (dollars in thousands). Variable rates received on fixed pay swaps are based on one-month or three-month LIBOR or overnight SOFR rates in effect at September 30, 2023 and December 31, 2022: September 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 2.4 5.42 % 2.02 % $ 575,000 2.3 4.44 % 1.13 % Swaps-Fair Value hedge Financial institution counterparties 654,870 5.6 5.30 % 3.19 % 742,675 6.3 3.42 % 3.21 % Swaps-Non-hedging Financial institution counterparties 216,777 8.3 5.91 % 2.66 % 223,124 9.0 4.83 % 2.69 % Customer counterparties 216,777 8.3 2.66 % 5.91 % 223,124 9.0 2.69 % 4.83 %

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 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 September 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 September 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 September 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 $ 224,209 $ 224,209 $ — $ — State and political subdivisions 708,543 — 708,543 — Corporate bonds and other 13,396 — 13,396 — MBS: (1) Residential 379,387 — 379,387 — Commercial 10,025 — 10,025 — Equity investments: Equity investments 5,072 5,072 — — Derivative assets: Interest rate swaps 109,514 — 109,514 — Total asset recurring fair value measurements $ 1,450,146 $ 229,281 $ 1,220,865 $ — Derivative liabilities: Interest rate swaps $ 27,876 $ — $ 27,876 $ — Total liability recurring fair value measurements $ 27,876 $ — $ 27,876 $ — Nonrecurring fair value measurements Foreclosed assets $ 50 $ — $ — $ 50 Collateral-dependent loans (2) 7,137 — — 7,137 Total asset nonrecurring fair value measurements $ 7,187 $ — $ — $ 7,187 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 September 30, 2023 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 325,823 $ 325,823 $ 325,823 $ — $ — Investment securities: HTM, at carrying value 1,185,474 944,586 — 944,586 — MBS: HTM, at carrying value 122,412 107,844 — 107,844 — FHLB stock, at cost 12,778 12,778 — 12,778 — Equity investments 4,382 4,382 — 4,382 — Loans, net of allowance for loan losses 4,378,873 3,962,889 — — 3,962,889 Loans held for sale 1,382 1,382 — 1,382 — Financial liabilities: Deposits $ 6,349,571 $ 6,315,058 $ — $ 6,315,058 $ — Other borrowings 395,209 393,551 — 393,551 — FHLB borrowings 212,829 198,457 — 198,457 — Subordinated notes, net of unamortized debt issuance costs 93,838 84,992 — 84,992 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,269 52,568 — 52,568 — 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	9 Months Ended
	Sep. 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 Nine Months Ended 2023 2022 2023 2022 Current income tax expense $ 4,672 $ 4,415 $ 14,099 $ 10,215 Deferred income tax expense (benefit) (1,552) (540) (1,868) 103 Income tax expense $ 3,120 $ 3,875 $ 12,231 $ 10,318 The net deferred tax asset totaled $41.2 million at September 30, 2023 as compared to $34.7 million at December 31, 2022. The increase in the net deferred tax asset is primarily the result of an increase in unrealized losses in the AFS securities portfolio. No valuation allowance was recorded at September 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 September 30, 2023 or December 31, 2022.

Off-Balance-Sheet Arrangements,

Off-Balance-Sheet Arrangements, Commitments and Contingencies	9 Months Ended
	Sep. 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 Nine Months Ended 2023 2022 2023 2022 Balance at beginning of period $ 3,207 $ 1,891 $ 3,687 $ 2,384 Provision for (reversal of) off-balance-sheet credit exposures 646 200 166 (293) Balance at end of period $ 3,853 $ 2,091 $ 3,853 $ 2,091 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): September 30, 2023 December 31, 2022 Commitments to extend credit $ 1,160,638 $ 1,296,773 Standby letters of credit 16,651 26,844 Total $ 1,177,289 $ 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 . There were no operating lease ROU assets obtained in exchange for new operating lease liabilities during the three months ended September 30, 2023, and there were $603,000 operating lease ROU assets obtained in exchange for new operating lease liabilities during the nine months ended September 30, 2023. During both the three and nine months ended September 30, 2022, there were $1.5 million 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 September 30, 2023, there were $24.9 million unsettled trades to purchase securities and no 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 September 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						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income	$ 18,449	$ 24,893	$ 26,034	$ 26,951	$ 25,405	$ 24,996	$ 69,376	$ 77,352

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accoun_2

Summary of Significant Accounting and Reporting Policies (Policies)	9 Months Ended
	Sep. 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

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 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 Nine Months Ended 2023 2022 2023 2022 Basic and Diluted Earnings: Net income $ 18,449 $ 26,951 $ 69,376 $ 77,352 Basic weighted-average shares outstanding 30,502 32,112 30,862 32,195 Add: Stock awards 41 109 54 146 Diluted weighted-average shares outstanding 30,543 32,221 30,916 32,341 Basic earnings per share: Net income $ 0.60 $ 0.84 $ 2.25 $ 2.40 Diluted earnings per share: Net income $ 0.60 $ 0.84 $ 2.24 $ 2.39

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 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 September 30, 2023 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (125,929) $ 29,439 $ (19,203) $ (115,693) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications (52,882) 7,377 — (45,505) Reclassification adjustments included in net income 1,997 (6,408) 189 (4,222) Income tax (expense) benefit 10,686 (203) (40) 10,443 Net current-period other comprehensive income (loss), net of tax (40,199) 766 149 (39,284) Ending balance, net of tax $ (166,128) $ 30,205 $ (19,054) $ (154,977) Nine Months Ended September 30, 2023 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (149,181) $ 31,227 $ (19,502) $ (137,456) Other comprehensive income (loss): Other comprehensive (loss) income before reclassifications (33,032) 16,277 — (16,755) Reclassification adjustments included in net income 11,579 (17,570) 567 (5,424) Income tax (expense) benefit 4,506 271 (119) 4,658 Net current-period other comprehensive income (loss), net of tax (16,947) (1,022) 448 (17,521) Ending balance, net of tax $ (166,128) $ 30,205 $ (19,054) $ (154,977) Three Months Ended September 30, 2022 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (137,792) $ 21,857 $ (23,400) $ (139,335) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications (67,721) 15,226 — (52,495) Reclassification adjustments included in net income 1,495 (1,572) 224 147 Income tax (expense) benefit 13,908 (2,868) (47) 10,993 Net current-period other comprehensive income (loss), net of tax (52,318) 10,786 177 (41,355) Ending balance, net of tax $ (190,110) $ 32,643 $ (23,223) $ (180,690) Nine Months Ended September 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 (354,649) 42,819 — (311,830) Reclassification adjustments included in net income 6,768 94 671 7,533 Income tax (expense) benefit 73,055 (9,013) (140) 63,902 Net current-period other comprehensive income (loss), net of tax (274,826) 33,900 531 (240,395) Ending balance, net of tax $ (190,110) $ 32,643 $ (23,223) $ (180,690)
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 Nine Months Ended 2023 2022 2023 2022 Unrealized gains and losses on securities transferred: Amortization of unrealized gains and losses (1) $ (2,008) $ (1,396) $ (5,989) $ (2,949) Tax benefit 422 293 1,258 619 Net of tax (1,586) (1,103) (4,731) (2,330) Unrealized gains and losses on available for sale securities: Realized net gain (loss) on sale of securities (2) 11 (99) (5,590) (3,819) Tax (expense) benefit (2) 21 1,174 802 Net of tax 9 (78) (4,416) (3,017) Derivatives: Realized net gain (loss) on interest rate swap derivatives (3) 6,408 1,572 17,570 (94) Tax benefit (1,346) (330) (3,690) 20 Net of tax 5,062 1,242 13,880 (74) Amortization of pension plan: Net actuarial loss (4) (189) (224) (567) (671) Tax benefit 40 47 119 140 Net of tax (149) (177) (448) (531) Total reclassifications for the period, net of tax $ 3,336 $ (116) $ 4,285 $ (5,952) (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)	9 Months Ended
	Sep. 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 September 30, 2023 and December 31, 2022 are reflected in the tables below (in thousands): September 30, 2023 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 224,174 $ 35 $ — $ 224,209 State and political subdivisions 822,753 14 114,224 708,543 Corporate bonds and other 14,550 19 1,173 13,396 MBS: (1) Residential 399,943 305 20,861 379,387 Commercial 11,100 — 1,075 10,025 Total $ 1,472,520 $ 373 $ 137,333 $ 1,335,560 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,038,934 $ — $ 225,921 $ 813,013 Corporate bonds and other 146,540 313 15,280 131,573 MBS: (1) Residential 91,954 1 11,305 80,650 Commercial 30,458 — 3,264 27,194 Total $ 1,307,886 $ 314 $ 255,770 $ 1,052,430 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.
Schedule of Unrealized Loss on Investments	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 September 30, 2023 and December 31, 2022, segregated by major security type and length of time in a continuous loss position (in thousands): September 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 $ 115,067 $ 6,434 $ 591,566 $ 107,790 $ 706,633 $ 114,224 Corporate bonds and other 12,500 1,166 689 7 13,189 1,173 MBS: Residential 157,854 2,226 191,521 18,635 349,375 20,861 Commercial 2,178 43 7,847 1,032 10,025 1,075 Total $ 287,599 $ 9,869 $ 791,623 $ 127,464 $ 1,079,222 $ 137,333 HELD TO MATURITY Investment securities: State and political subdivisions $ 186,212 $ 13,551 $ 626,801 $ 212,370 $ 813,013 $ 225,921 Corporate bonds and other 13,595 1,425 111,451 13,855 125,046 15,280 MBS: Residential 523 2 80,024 11,303 80,547 11,305 Commercial — — 27,194 3,264 27,194 3,264 Total $ 200,330 $ 14,978 $ 845,470 $ 240,792 $ 1,045,800 $ 255,770 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 MBS: 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 $ 3,784 $ 44 State and political subdivisions 16,940 14,666 Corporate bonds and other 1,765 1,668 MBS 4,426 4,770 Total interest income on securities $ 26,915 $ 21,148 Nine Months Ended 2023 2022 U.S. Treasury $ 8,307 $ 271 State and political subdivisions 50,940 41,786 Corporate bonds and other 5,363 4,385 MBS 12,585 12,025 Total interest income on securities $ 77,195 $ 58,467
Amortized cost, carrying value and fair value of securities presented by contractual maturity	The amortized cost and estimated fair value of AFS and HTM securities at September 30, 2023, are presented below by contractual maturity (in thousands): September 30, 2023 Amortized Cost Fair Value AVAILABLE FOR SALE Investment securities: Due in one year or less $ 224,385 $ 224,420 Due after one year through five years 4,266 4,193 Due after five years through ten years 33,991 32,127 Due after ten years 798,835 685,408 1,061,477 946,148 MBS: 411,043 389,412 Total $ 1,472,520 $ 1,335,560 September 30, 2023 Amortized Cost Fair Value HELD TO MATURITY Investment securities: Due in one year or less $ 15,962 $ 15,281 Due after one year through five years 4,861 4,684 Due after five years through ten years 140,605 125,451 Due after ten years 1,024,046 799,170 1,185,474 944,586 MBS: 122,412 107,844 Total $ 1,307,886 $ 1,052,430
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 Nine Months Ended 2023 2022 2023 2022 Net gains (losses) recognized during the period on equity investments $ (163) $ (230) $ 4,895 $ (696) Less: Net gains recognized during the period on equity investments sold during the period — — 5,058 — Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date $ (163) $ (230) $ (163) $ (696)

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Loans by Portfolio Segment	Loans in the accompanying consolidated balance sheets are classified as follows (in thousands): September 30, 2023 December 31, 2022 Real estate loans: Construction $ 720,515 $ 559,681 1-4 family residential 689,492 663,519 Commercial 2,117,306 1,987,707 Commercial loans 385,816 412,064 Municipal loans 441,512 450,067 Loans to individuals 65,992 74,653 Total loans 4,420,633 4,147,691 Less: Allowance for loan losses 41,760 36,515 Net loans $ 4,378,873 $ 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): September 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 $ 109,018 $ 225,290 $ 191,843 $ 33,111 $ 3,009 $ 6,753 $ 128,083 $ 697,107 Pass watch — — — — — — 9,544 9,544 Special mention 171 13,303 188 — 8 — — 13,670 Substandard — 73 — — — 80 — 153 Doubtful — — 41 — — — — 41 Total construction real estate $ 109,189 $ 238,666 $ 192,072 $ 33,111 $ 3,017 $ 6,833 $ 137,627 $ 720,515 Current period gross charge-offs $ — $ 63 $ — $ — $ — $ — $ — $ 63 1-4 family residential real estate: Pass $ 36,549 $ 114,435 $ 143,340 $ 119,327 $ 64,791 $ 202,168 $ 1,858 $ 682,468 Pass watch — — — 34 — — — 34 Special mention — — — 1,090 — 1,348 — 2,438 Substandard 155 — 76 378 53 3,479 57 4,198 Doubtful — — — — — 354 — 354 Total 1-4 family residential real estate $ 36,704 $ 114,435 $ 143,416 $ 120,829 $ 64,844 $ 207,349 $ 1,915 $ 689,492 Current period gross charge-offs $ — $ — $ — $ — $ — $ 71 $ — $ 71 Commercial real estate: Pass $ 338,060 $ 708,281 $ 501,231 $ 148,979 $ 92,448 $ 203,242 $ 15,583 $ 2,007,824 Pass watch 39,704 9,530 1,846 632 338 148 — 52,198 Special mention 2,015 871 — — 7,761 25,347 — 35,994 Substandard — — 281 269 14,206 6,377 — 21,133 Doubtful — — — — 70 87 — 157 Total commercial real estate $ 379,779 $ 718,682 $ 503,358 $ 149,880 $ 114,823 $ 235,201 $ 15,583 $ 2,117,306 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial loans: Pass $ 54,023 $ 78,551 $ 58,150 $ 12,486 $ 5,107 $ 4,038 $ 170,437 $ 382,792 Pass watch 26 40 125 — — 20 — 211 Special mention — 176 — 20 — 177 780 1,153 Substandard 205 443 89 — 92 6 — 835 Doubtful — 395 106 — 102 120 102 825 Total commercial loans $ 54,254 $ 79,605 $ 58,470 $ 12,506 $ 5,301 $ 4,361 $ 171,319 $ 385,816 Current period gross charge-offs $ 575 $ 439 $ 44 $ 26 $ 23 $ 6 $ — $ 1,113 Municipal loans: Pass $ 30,063 $ 62,250 $ 70,471 $ 50,793 $ 42,340 $ 185,595 $ — $ 441,512 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 30,063 $ 62,250 $ 70,471 $ 50,793 $ 42,340 $ 185,595 $ — $ 441,512 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 20,845 $ 17,948 $ 13,536 $ 7,550 $ 2,698 $ 1,169 $ 2,207 $ 65,953 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — 14 — — 14 Doubtful — — 5 — — 11 9 25 Total loans to individuals $ 20,845 $ 17,948 $ 13,541 $ 7,550 $ 2,712 $ 1,180 $ 2,216 $ 65,992 Current period gross charge-offs (1) $ 1,218 $ 34 $ 39 $ 12 $ 3 $ 79 $ — $ 1,385 Total loans $ 630,834 $ 1,231,586 $ 981,328 $ 374,669 $ 233,037 $ 640,519 $ 328,660 $ 4,420,633 Total current period gross charge-offs (1) $ 1,793 $ 536 $ 83 $ 38 $ 26 $ 156 $ — $ 2,632 (1) Includes $1.2 million 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): September 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 $ 175 $ — $ — $ 175 $ 720,340 $ 720,515 1-4 family residential 748 685 1,963 3,396 686,096 689,492 Commercial 2,331 41 36 2,408 2,114,898 2,117,306 Commercial loans 494 162 525 1,181 384,635 385,816 Municipal loans — — — — 441,512 441,512 Loans to individuals 140 11 — 151 65,841 65,992 Total $ 3,888 $ 899 $ 2,524 $ 7,311 $ 4,413,322 $ 4,420,633 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): September 30, 2023 December 31, 2022 Nonaccrual loans: Real estate loans: Construction $ 41 $ 405 1-4 family residential 2,365 848 Commercial 527 762 Commercial loans 1,358 757 Loans to individuals 25 74 Total nonaccrual loans (1) 4,316 2,846 Accruing loans past due more than 90 days — — Restructured loans (2) 15 7,849 OREO 50 93 Repossessed assets — 74 Total nonperforming assets $ 4,381 $ 10,862 (1) Includes $343,000 and $897,000 of restructured loans as of September 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 September 30, 2023 exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures.
Restructured Loans	The following tables set forth the recorded balance of restructured loans and type of modification by class of loans during the periods presented (dollars in thousands): Three Months Ended September 30, 2023 Amortization Interest Rate Reduction Combination Total Modifications Number of Loans Percent of Total Class Commercial loans $ 15 $ — $ 65 $ 80 2 0.02 % Total $ 15 $ — $ 65 $ 80 2 Nine Months Ended September 30, 2023 Amortization Interest Rate Reduction Combination Total Modifications Number of Loans Percent of Total Class Commercial loans $ 293 $ — $ 65 $ 358 4 0.09 % Total $ 293 $ — $ 65 $ 358 4
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 September 30, 2023 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,395 $ 2,660 $ 28,012 $ 2,017 $ 37 $ 182 $ 36,303 Loans charged-off — — — (744) — (518) (1,262) Recoveries of loans charged-off — 62 — 65 — 251 378 Net loans (charged-off) recovered — 62 — (679) — (267) (884) Provision for (reversal of) loan losses 1,019 17 4,327 731 (17) 264 6,341 Balance at end of period $ 4,414 $ 2,739 $ 32,339 $ 2,069 $ 20 $ 179 $ 41,760 Nine Months Ended September 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) — (1,113) — (1,385) (2,632) Recoveries of loans charged-off 1 108 1 268 — 792 1,170 Net loans (charged-off) recovered (62) 37 1 (845) — (593) (1,462) Provision for (reversal of) loan losses 1,312 529 3,637 679 (25) 575 6,707 Balance at end of period $ 4,414 $ 2,739 $ 32,339 $ 2,069 $ 20 $ 179 $ 41,760 Three Months Ended September 30, 2022 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,399 $ 2,024 $ 27,221 $ 2,558 $ 46 $ 201 $ 35,449 Loans charged-off — (66) — (192) — (428) (686) Recoveries of loans charged-off — 4 — 139 — 306 449 Net loans (charged-off) recovered — (62) — (53) — (122) (237) Provision for (reversal of) loan losses 136 44 1,273 (272) (2) 115 1,294 Balance at end of period $ 3,535 $ 2,006 $ 28,494 $ 2,233 $ 44 $ 194 $ 36,506 Nine Months Ended September 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 — (66) — (369) — (1,285) (1,720) Recoveries of loans charged-off 1 96 81 469 — 858 1,505 Net loans (charged-off) recovered 1 30 81 100 — (427) (215) Provision for (reversal of) loan losses (253) 110 1,433 (264) (3) 425 1,448 Balance at end of period $ 3,535 $ 2,006 $ 28,494 $ 2,233 $ 44 $ 194 $ 36,506

Borrowing Arrangements (Tables)

Borrowing Arrangements (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Debt	Information related to borrowings is provided in the table below (dollars in thousands): September 30, 2023 December 31, 2022 Other borrowings: Balance at end of period $ 395,209 $ 221,153 Average amount outstanding during the period (1) 451,966 77,845 Maximum amount outstanding during the period (2) 1,030,421 316,563 Weighted average interest rate during the period (3) 4.8 % 2.4 % Interest rate at end of period (4) 4.4 % 4.1 % FHLB borrowings: Balance at end of period $ 212,829 $ 153,358 Average amount outstanding during the period (1) 281,260 135,926 Maximum amount outstanding during the period (2) 533,242 423,645 Weighted average interest rate during the period (3) 2.5 % 2.4 % Interest rate at end of period (5) 1.4 % 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 September 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 $ 388,888 $ 6,321 $ — $ — $ — $ — $ 395,209 FHLB borrowings 210,733 764 582 401 349 — 212,829 Total obligations $ 599,621 $ 7,085 $ 582 $ 401 $ 349 $ — $ 608,038

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 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): September 30, 2023 December 31, 2022 Subordinated notes: (1) 3.875% Subordinated notes, net of unamortized debt issuance costs (2) $ 93,838 $ 98,674 Total Subordinated notes 93,838 98,674 Trust preferred subordinated debentures: (3) Southside Statutory Trust III, net of unamortized debt issuance costs (4) 20,577 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 60,269 60,265 Total Long-term debt $ 154,107 $ 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 September 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 September 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 SOFR + 3.20% September 4, 2033 Southside Statutory Trust IV (2) August 8, 2007 $ 23,196 Floating 3 month SOFR + 1.56% October 30, 2037 Southside Statutory Trust V (2) August 10, 2007 $ 12,887 Floating 3 month SOFR + 2.51% September 15, 2037 Magnolia Trust Company I (2) (3) May 20, 2005 $ 3,609 Floating 3 month SOFR + 2.06% 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)	9 Months Ended
	Sep. 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 September 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2023 2022 2023 2022 2023 2022 Interest cost $ 942 $ 685 $ 31 $ 25 $ 208 $ 144 Expected return on assets (1,143) (1,461) (47) (58) — — Net loss amortization 182 160 — — 7 64 Net periodic benefit cost (income) $ (19) $ (616) $ (16) $ (33) $ 215 $ 208 Nine Months Ended September 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2023 2022 2023 2022 2023 2022 Interest cost $ 2,828 $ 2,056 $ 94 $ 76 $ 623 $ 433 Expected return on assets (3,430) (4,384) (140) (174) — — Net loss amortization 545 480 — — 22 191 Net periodic benefit cost (income) $ (57) $ (1,848) $ (46) $ (98) $ 645 $ 624

Derivative Financial Instrume_2

Derivative Financial Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 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): September 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 $ 39,409 $ — $ 575,000 $ 39,527 $ — Swaps-Fair Value Hedge-Financial institution counterparties 654,870 42,229 — 742,675 21,733 171 Derivatives designated as non-hedging instruments Interest rate contracts: Swaps-Financial institution counterparties 216,777 27,876 — 223,124 21,046 — Swaps-Customer counterparties 216,777 — 27,876 223,124 — 21,046 Gross derivatives 109,514 27,876 82,306 21,217 Offsetting derivative assets/liabilities — — (171) (171) Cash collateral received/posted (109,514) — (82,135) — Net derivatives included in the consolidated balance sheets (2) $ — $ 27,876 $ — $ 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 September 30, 2023 and December 31, 2022: September 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 2.4 5.42 % 2.02 % $ 575,000 2.3 4.44 % 1.13 % Swaps-Fair Value hedge Financial institution counterparties 654,870 5.6 5.30 % 3.19 % 742,675 6.3 3.42 % 3.21 % Swaps-Non-hedging Financial institution counterparties 216,777 8.3 5.91 % 2.66 % 223,124 9.0 4.83 % 2.69 % Customer counterparties 216,777 8.3 2.66 % 5.91 % 223,124 9.0 2.69 % 4.83 %

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 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 September 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 $ 224,209 $ 224,209 $ — $ — State and political subdivisions 708,543 — 708,543 — Corporate bonds and other 13,396 — 13,396 — MBS: (1) Residential 379,387 — 379,387 — Commercial 10,025 — 10,025 — Equity investments: Equity investments 5,072 5,072 — — Derivative assets: Interest rate swaps 109,514 — 109,514 — Total asset recurring fair value measurements $ 1,450,146 $ 229,281 $ 1,220,865 $ — Derivative liabilities: Interest rate swaps $ 27,876 $ — $ 27,876 $ — Total liability recurring fair value measurements $ 27,876 $ — $ 27,876 $ — Nonrecurring fair value measurements Foreclosed assets $ 50 $ — $ — $ 50 Collateral-dependent loans (2) 7,137 — — 7,137 Total asset nonrecurring fair value measurements $ 7,187 $ — $ — $ 7,187 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 September 30, 2023 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 325,823 $ 325,823 $ 325,823 $ — $ — Investment securities: HTM, at carrying value 1,185,474 944,586 — 944,586 — MBS: HTM, at carrying value 122,412 107,844 — 107,844 — FHLB stock, at cost 12,778 12,778 — 12,778 — Equity investments 4,382 4,382 — 4,382 — Loans, net of allowance for loan losses 4,378,873 3,962,889 — — 3,962,889 Loans held for sale 1,382 1,382 — 1,382 — Financial liabilities: Deposits $ 6,349,571 $ 6,315,058 $ — $ 6,315,058 $ — Other borrowings 395,209 393,551 — 393,551 — FHLB borrowings 212,829 198,457 — 198,457 — Subordinated notes, net of unamortized debt issuance costs 93,838 84,992 — 84,992 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,269 52,568 — 52,568 — 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)	9 Months Ended
	Sep. 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 Nine Months Ended 2023 2022 2023 2022 Current income tax expense $ 4,672 $ 4,415 $ 14,099 $ 10,215 Deferred income tax expense (benefit) (1,552) (540) (1,868) 103 Income tax expense $ 3,120 $ 3,875 $ 12,231 $ 10,318

Off-Balance-Sheet Arrangement_2

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 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 Nine Months Ended 2023 2022 2023 2022 Balance at beginning of period $ 3,207 $ 1,891 $ 3,687 $ 2,384 Provision for (reversal of) off-balance-sheet credit exposures 646 200 166 (293) Balance at end of period $ 3,853 $ 2,091 $ 3,853 $ 2,091
Schedule of unused commitments	Financial instruments with off-balance-sheet risk were as follows (in thousands): September 30, 2023 December 31, 2022 Commitments to extend credit $ 1,160,638 $ 1,296,773 Standby letters of credit 16,651 26,844 Total $ 1,177,289 $ 1,323,617

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic and Diluted Earnings:
Net income	$ 18,449	$ 24,893	$ 26,034	$ 26,951	$ 25,405	$ 24,996	$ 69,376	$ 77,352
Basic weighted-average shares outstanding (in shares)	30,502			32,112			30,862	32,195
Add: Stock awards (in shares)	41			109			54	146
Diluted weighted-average shares outstanding (in shares)	30,543			32,221			30,916	32,341
Basic earnings per share:
Earnings per common share - basic (in dollars per share)	$ 0.60			$ 0.84			$ 2.25	$ 2.40
Diluted earnings per share:
Earnings per common share - diluted (in dollars per share)	$ 0.60			$ 0.84			$ 2.24	$ 2.39
Number of antidilutive shares (in shares)	611			22			571	0

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	$ 765,161	$ 731,782	$ 745,997	$ 912,172
Income tax (expense) benefit	10,443	10,993	4,658	63,902
Ending balance, net of tax	728,595	707,636	728,595	707,636
Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(125,929)	(137,792)	(149,181)	84,716
Other comprehensive (loss) income before reclassifications	(52,882)	(67,721)	(33,032)	(354,649)
Reclassification adjustments included in net income	1,997	1,495	11,579	6,768
Income tax (expense) benefit	10,686	13,908	4,506	73,055
Net current-period other comprehensive income (loss), net of tax	(40,199)	(52,318)	(16,947)	(274,826)
Ending balance, net of tax	(166,128)	(190,110)	(166,128)	(190,110)
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	29,439	21,857	31,227	(1,257)
Other comprehensive (loss) income before reclassifications	7,377	15,226	16,277	42,819
Reclassification adjustments included in net income	(6,408)	(1,572)	(17,570)	94
Income tax (expense) benefit	(203)	(2,868)	271	(9,013)
Net current-period other comprehensive income (loss), net of tax	766	10,786	(1,022)	33,900
Ending balance, net of tax	30,205	32,643	30,205	32,643
Retirement Plans
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(19,203)	(23,400)	(19,502)	(23,754)
Other comprehensive (loss) income before reclassifications	0	0	0	0
Reclassification adjustments included in net income	189	224	567	671
Income tax (expense) benefit	(40)	(47)	(119)	(140)
Net current-period other comprehensive income (loss), net of tax	149	177	448	531
Ending balance, net of tax	(19,054)	(23,223)	(19,054)	(23,223)
Total
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(115,693)	(139,335)	(137,456)	59,705
Other comprehensive (loss) income before reclassifications	(45,505)	(52,495)	(16,755)	(311,830)
Reclassification adjustments included in net income	(4,222)	147	(5,424)	7,533
Income tax (expense) benefit	10,443	10,993	4,658	63,902
Net current-period other comprehensive income (loss), net of tax	(39,284)	(41,355)	(17,521)	(240,395)
Ending balance, net of tax	$ (154,977)	$ (180,690)	$ (154,977)	$ (180,690)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized gains and losses		$ 2,008	$ 1,396	$ 5,989	$ 2,949
Tax benefit (expense)		(3,120)	(3,875)	(12,231)	(10,318)
Realized net gain (loss) on sale of securities		11	(99)	(5,590)	(3,819)
Total reclassifications for the period, net of tax		3,336	(116)	4,285	(5,952)
Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(1,997)	(1,495)	(11,579)	(6,768)
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		6,408	1,572	17,570	(94)
Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[1]	(189)	(224)	(567)	(671)
Amortization of pension plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(189)	(224)	(567)	(671)
Tax benefit		40	47	119	140
Total reclassifications for the period, net of tax		(149)	(177)	(448)	(531)
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]	(2,008)	(1,396)	(5,989)	(2,949)
Tax benefit (expense)		422	293	1,258	619
Net of tax		(1,586)	(1,103)	(4,731)	(2,330)
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)		(2)	21	1,174	802
Net of tax		9	(78)	(4,416)	(3,017)
Realized net gain (loss) on sale of securities	[3]	11	(99)	(5,590)	(3,819)
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)		(1,346)	(330)	(3,690)	20
Net of tax		5,062	1,242	13,880	(74)
Realized net (loss) gain on interest rate swap derivatives	[4]	$ 6,408	$ 1,572	$ 17,570	$ (94)
[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		Sep. 30, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Amortized Cost		$ 1,472,520	$ 1,387,874
Gross unrealized gains		373	1,282
Gross unrealized losses		137,333	90,142
Securities AFS, at estimated fair value		1,335,560	1,299,014
HELD TO MATURITY
Amortized cost		1,307,886	1,326,729
Gross unrealized gains		314	4,565
Gross unrealized losses		255,770	182,138
Estimated Fair Value		1,052,430	1,149,156
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		224,174
Gross unrealized gains		35
Gross unrealized losses		0
Securities AFS, at estimated fair value		224,209
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		822,753	1,039,453
Gross unrealized gains		14	956
Gross unrealized losses		114,224	75,557
Securities AFS, at estimated fair value		708,543	964,852
HELD TO MATURITY
Amortized cost		1,038,934	1,037,556
Gross unrealized gains		0	3,969
Gross unrealized losses		225,921	163,283
Estimated Fair Value		813,013	878,242
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,550	8,692
Gross unrealized gains		19	26
Gross unrealized losses		1,173	14
Securities AFS, at estimated fair value		13,396	8,704
HELD TO MATURITY
Amortized cost		146,540	152,552
Gross unrealized gains		313	575
Gross unrealized losses		15,280	7,993
Estimated Fair Value		131,573	145,134
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	399,943	328,400
Gross unrealized gains	[1]	305	250
Gross unrealized losses	[1]	20,861	13,623
Securities AFS, at estimated fair value	[1]	379,387	315,027
HELD TO MATURITY
Amortized cost	[1]	91,954	93,796
Gross unrealized gains	[1]	1	21
Gross unrealized losses	[1]	11,305	8,343
Estimated Fair Value	[1]	80,650	85,474
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	11,100	11,329
Gross unrealized gains	[1]	0	50
Gross unrealized losses	[1]	1,075	948
Securities AFS, at estimated fair value	[1]	10,025	10,431
HELD TO MATURITY
Amortized cost	[1]	30,458	42,825
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	3,264	2,519
Estimated Fair Value	[1]	$ 27,194	$ 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	Sep. 30, 2023	Dec. 31, 2022
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 287,599	$ 1,174,855
Less than 12 Months, unrealized loss	9,869	82,638
More than 12 Months, fair value	791,623	29,165
More than 12 Months, unrealized Loss	127,464	7,504
Total fair value	1,079,222	1,204,020
Total unrealized loss	137,333	90,142
HELD TO MATURITY
Less than 12 months, fair value	200,330	672,739
Less than 12 months, unrealized loss	14,978	83,876
More than 12 months, fair value	845,470	340,055
More than 12 months, unrealized loss	240,792	98,262
Total fair value	1,045,800	1,012,794
Total unrealized loss	255,770	182,138
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	115,067	859,270
Less than 12 Months, unrealized loss	6,434	68,683
More than 12 Months, fair value	591,566	26,620
More than 12 Months, unrealized Loss	107,790	6,874
Total fair value	706,633	885,890
Total unrealized loss	114,224	75,557
HELD TO MATURITY
Less than 12 months, fair value	186,212	426,382
Less than 12 months, unrealized loss	13,551	66,898
More than 12 months, fair value	626,801	323,385
More than 12 months, unrealized loss	212,370	96,385
Total fair value	813,013	749,767
Total unrealized loss	225,921	163,283
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	12,500	3,678
Less than 12 Months, unrealized loss	1,166	14
More than 12 Months, fair value	689	0
More than 12 Months, unrealized Loss	7	0
Total fair value	13,189	3,678
Total unrealized loss	1,173	14
HELD TO MATURITY
Less than 12 months, fair value	13,595	125,250
Less than 12 months, unrealized loss	1,425	6,660
More than 12 months, fair value	111,451	12,738
More than 12 months, unrealized loss	13,855	1,333
Total fair value	125,046	137,988
Total unrealized loss	15,280	7,993
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	157,854	306,294
Less than 12 Months, unrealized loss	2,226	13,623
More than 12 Months, fair value	191,521	0
More than 12 Months, unrealized Loss	18,635	0
Total fair value	349,375	306,294
Total unrealized loss	20,861	13,623
HELD TO MATURITY
Less than 12 months, fair value	523	80,801
Less than 12 months, unrealized loss	2	7,799
More than 12 months, fair value	80,024	3,932
More than 12 months, unrealized loss	11,303	544
Total fair value	80,547	84,733
Total unrealized loss	11,305	8,343
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value	2,178	5,613
Less than 12 Months, unrealized loss	43	318
More than 12 Months, fair value	7,847	2,545
More than 12 Months, unrealized Loss	1,032	630
Total fair value	10,025	8,158
Total unrealized loss	1,075	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	27,194	0
More than 12 months, unrealized loss	3,264	0
Total fair value	27,194	40,306
Total unrealized loss	$ 3,264	$ 2,519

Securities - Interest Income on

Securities - Interest Income on Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt Securities [Abstract]
US Treasury	$ 3,784	$ 44	$ 8,307	$ 271
State and political subdivisions	16,940	14,666	50,940	41,786
Corporate bonds and other	1,765	1,668	5,363	4,385
MBS	4,426	4,770	12,585	12,025
Total interest income on securities	$ 26,915	$ 21,148	$ 77,195	$ 58,467

Securities - Amortized Cost and

Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available for sale, Amortized Cost
Due in one year or less	$ 224,385
Due after one year through five years	4,266
Due after five years through ten years	33,991
Due after ten years	798,835
Total available-for-sale investment securities	1,061,477
MBS:	411,043
Amortized Cost	1,472,520	$ 1,387,874
Available for sale, Fair Value
Due in one year or less	224,420
Due after one year through five years	4,193
Due after five years through ten years	32,127
Due after ten years	685,408
Total available-for-sale investment securities	946,148
MBS:	389,412
Total	1,335,560	1,299,014
Held to maturity, Amortized Cost
Due in one year or less	15,962
Due after one year through five years	4,861
Due after five years through ten years	140,605
Due after ten years	1,024,046
Total held-to-maturity investment securities	1,185,474
Mortgage-backed securities	122,412
Amortized cost	1,307,886	1,326,729
Held to maturity, Fair Value
Due in one year or less	15,281
Due after one year through five years	4,684
Due after five years through ten years	125,451
Due after ten years	799,170
Total held-to-maturity investment securities	944,586
Mortgage-backed securities	107,844
Total	$ 1,052,430	$ 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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments, All Other Investments [Abstract]
Net gains (losses) recognized during the period on equity investments	$ (163)	$ (230)	$ 4,895	$ (696)
Less: Net gains recognized during the period on equity investments sold during the period	0	0	5,058	0
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date	$ (163)	$ (230)	$ (163)	$ (696)

Securities - Narrative (Details

Securities - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) debt_security	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) debt_security	Sep. 30, 2022 USD ($)	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	115,600,000		115,600,000		121,500,000
Securities transferred, Unrealized Loss, Net of Tax	91,300,000		91,300,000		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	11,000	$ (99,000)	(5,590,000)	$ (3,819,000)
Gross realized gains on AFS securities			1,400,000	584,000
Gross realized losses on AFS securities			7,000,000	4,400,000
Equity investments	9,454,000		9,454,000		11,181,000
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Sale of HTM portfolio	0	0	0	0
Interest receivable	39,646,000		39,646,000		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	585		585
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 325,823,000	195,127,000	$ 325,823,000	195,127,000	199,252,000	$ 201,753,000
Less: Net gains recognized during the period on equity investments sold during the period	0	0	5,058,000	0
Debt Securities, Available-for-Sale, Accrued Interest	10,800,000		10,800,000		16,900,000
Debt Securities, Held-to-Maturity, Accrued Interest	8,500,000		8,500,000		13,600,000
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	2,480,000,000		2,480,000,000		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

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans	$ 4,420,633		$ 4,147,691
Less: Allowance for loan losses	41,760	$ 36,303	36,515	$ 36,506	$ 35,449	$ 35,273
Total loans	4,378,873		4,111,176
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	720,515		559,681
Less: Allowance for loan losses	4,414	3,395	3,164	3,535	3,399	3,787
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	689,492		663,519
Less: Allowance for loan losses	2,739	2,660	2,173	2,006	2,024	1,866
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	2,117,306		1,987,707
Less: Allowance for loan losses	32,339	28,012	28,701	28,494	27,221	26,980
Commercial loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	385,816		412,064
Less: Allowance for loan losses	2,069	2,017	2,235	2,233	2,558	2,397
Municipal loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	441,512		450,067
Less: Allowance for loan losses	20	37	45	44	46	47
Loans to individuals
Loans and Leases Receivable Disclosure [Abstract]
Loans	65,992		74,653
Less: Allowance for loan losses	$ 179	$ 182	$ 197	$ 194	$ 201	$ 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		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		$ 630,834		$ 630,834		$ 1,262,330
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		1,231,586		1,231,586		1,055,361
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		981,328		981,328		422,026
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		374,669		374,669		290,975
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		233,037		233,037		128,067
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		640,519		640,519		630,012
Financing Receivable, Excluding Accrued Interest, Revolving		328,660		328,660		358,920
Loans		4,420,633		4,420,633		4,147,691
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	[1]			1,793
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff				536
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff				83
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff				38
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff				26
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff				156
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff				0
Loans charged-off		1,262	$ 686	2,632	$ 1,720
Construction Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		109,189		109,189		171,809
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		238,666		238,666		184,835
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		192,072		192,072		34,537
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		33,111		33,111		7,456
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		3,017		3,017		1,886
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,833		6,833		6,628
Financing Receivable, Excluding Accrued Interest, Revolving		137,627		137,627		152,530
Loans		720,515		720,515		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		0	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		109,018		109,018		169,652
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		225,290		225,290		184,501
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		191,843		191,843		34,537
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		33,111		33,111		7,091
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		3,009		3,009		1,844
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,753		6,753		6,434
Financing Receivable, Excluding Accrued Interest, Revolving		128,083		128,083		152,530
Loans		697,107		697,107		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		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		9,544		9,544		0
Loans		9,544		9,544		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		171		171		1,858
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		13,303		13,303		290
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		188		188		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		8		8		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		13,670		13,670		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		73		73		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		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		80		80		194
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		153		153		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		41		41		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		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		41		41		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		36,704		36,704		82,850
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		114,435		114,435		144,424
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		143,416		143,416		128,962
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		120,829		120,829		70,196
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		64,844		64,844		38,312
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		207,349		207,349		196,572
Financing Receivable, Excluding Accrued Interest, Revolving		1,915		1,915		2,203
Loans		689,492		689,492		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		0	66	71	66
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		36,549		36,549		82,847
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		114,435		114,435		144,424
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		143,340		143,340		128,666
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		119,327		119,327		70,142
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		64,791		64,791		36,710
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		202,168		202,168		194,490
Financing Receivable, Excluding Accrued Interest, Revolving		1,858		1,858		2,160
Loans		682,468		682,468		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		34		34		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		34		34		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		0		0		79
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		1,090		1,090		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0		0		1,397
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		1,348		1,348		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		2,438		2,438		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		155		155		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		76		76		217
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		378		378		54
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		53		53		32
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		3,479		3,479		1,942
Financing Receivable, Excluding Accrued Interest, Revolving		57		57		43
Loans		4,198		4,198		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		354		354		140
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		354		354		313
Commercial Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		379,779		379,779		798,653
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		718,682		718,682		556,157
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		503,358		503,358		170,720
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		149,880		149,880		151,449
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		114,823		114,823		55,855
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		235,201		235,201		242,558
Financing Receivable, Excluding Accrued Interest, Revolving		15,583		15,583		12,315
Loans		2,117,306		2,117,306		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		338,060		338,060		798,653
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		708,281		708,281		546,938
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		501,231		501,231		168,607
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		148,979		148,979		136,440
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		92,448		92,448		55,480
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		203,242		203,242		233,509
Financing Receivable, Excluding Accrued Interest, Revolving		15,583		15,583		12,315
Loans		2,007,824		2,007,824		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		39,704		39,704		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		9,530		9,530		9,219
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		1,846		1,846		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		632		632		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		338		338		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		148		148		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		52,198		52,198		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		2,015		2,015		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		871		871		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		7,761		7,761		115
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		25,347		25,347		1,849
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		35,994		35,994		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		281		281		281
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		269		269		14,603
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		14,206		14,206		260
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6,377		6,377		6,992
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		21,133		21,133		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		70		70		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		87		87		208
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		157		157		284
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		54,254		54,254		114,174
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		79,605		79,605		73,847
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		58,470		58,470		18,009
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		12,506		12,506		8,445
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		5,301		5,301		5,330
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		4,361		4,361		3,322
Financing Receivable, Excluding Accrued Interest, Revolving		171,319		171,319		188,937
Loans		385,816		385,816		412,064
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff				575
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff				439
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff				44
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff				26
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				6
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff				0
Loans charged-off		744	192	1,113	369
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		54,023		54,023		113,678
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		78,551		78,551		68,509
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		58,150		58,150		17,852
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		12,486		12,486		8,249
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		5,107		5,107		4,820
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		4,038		4,038		3,313
Financing Receivable, Excluding Accrued Interest, Revolving		170,437		170,437		178,951
Loans		382,792		382,792		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		40		40		13
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		125		125		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		20		20		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		211		211		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		176		176		5,109
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0		0		31
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		20		20		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		177		177		0
Financing Receivable, Excluding Accrued Interest, Revolving		780		780		9,986
Loans		1,153		1,153		15,414
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		205		205		220
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		443		443		116
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		89		89		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		92		92		12
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		6		6		9
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		835		835		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		395		395		100
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		106		106		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		102		102		210
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		120		120		0
Financing Receivable, Excluding Accrued Interest, Revolving		102		102		0
Loans		825		825		464
Municipal loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		30,063		30,063		65,258
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		62,250		62,250		74,617
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		70,471		70,471		57,147
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		50,793		50,793		48,144
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		42,340		42,340		24,979
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		185,595		185,595		179,922
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		441,512		441,512		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		30,063		30,063		65,258
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		62,250		62,250		74,617
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		70,471		70,471		57,147
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		50,793		50,793		47,636
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		42,340		42,340		24,576
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		185,595		185,595		173,919
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		441,512		441,512		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		20,845		20,845		29,586
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		17,948		17,948		21,481
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		13,541		13,541		12,651
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		7,550		7,550		5,285
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		2,712		2,712		1,705
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		1,180		1,180		1,010
Financing Receivable, Excluding Accrued Interest, Revolving		2,216		2,216		2,935
Loans		65,992		65,992		74,653
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	[1]			1,218
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Current Fiscal Year, Writeoff				34
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Current Fiscal Year, Writeoff				39
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Current Fiscal Year, Writeoff				12
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Current Fiscal Year, Writeoff				3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff				79
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff				0
Loans charged-off		518	$ 428	1,385	$ 1,285
Loans to individuals | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		20,845		20,845		29,579
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		17,948		17,948		21,480
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		13,536		13,536		12,651
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		7,550		7,550		5,261
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		2,698		2,698		1,665
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		1,169		1,169		1,005
Financing Receivable, Excluding Accrued Interest, Revolving		2,207		2,207		2,935
Loans		65,953		65,953		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		0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving		0		0		0
Loans		0		0		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		0		0		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		14		14		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		14		14		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		5		5		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		11		11		3
Financing Receivable, Excluding Accrued Interest, Revolving		9		9		0
Loans		$ 25		25		$ 68
Demand Deposit Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff				$ 1,200
[1]Includes $1.2 million 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	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans	$ 4,420,633	$ 4,147,691
Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	4,413,322	4,141,558
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,888	4,395
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	899	822
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,524	916
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	7,311	6,133
Construction Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	720,515	559,681
Construction Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	720,340	559,617
Construction Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	175	43
Construction Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	21
Construction Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	175	64
1-4 Family Residential Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	689,492	663,519
1-4 Family Residential Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	686,096	659,408
1-4 Family Residential Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	748	3,529
1-4 Family Residential Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	685	368
1-4 Family Residential Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,963	214
1-4 Family Residential Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,396	4,111
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	2,117,306	1,987,707
Commercial Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	2,114,898	1,987,034
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,331	105
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	41	153
Commercial Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	36	415
Commercial Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,408	673
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans	385,816	412,064
Commercial loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	384,635	411,025
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	494	515
Commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	162	277
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	525	247
Commercial loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,181	1,039
Municipal loans
Financing Receivable, Past Due [Line Items]
Loans	441,512	450,067
Municipal loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	441,512	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	65,992	74,653
Loans to individuals | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	65,841	74,407
Loans to individuals | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	140	203
Loans to individuals | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	11	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	$ 151	$ 246

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Nonperforming Assets by Asset Class (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2023	Dec. 31, 2022
Nonperforming Assets [Line Items]
Restructured loans			$ 897
Amortization Period Extension
Nonperforming Assets [Line Items]
Restructured loans		$ 343
Commercial loans | Amortization Period Extension
Nonperforming Assets [Line Items]
Restructured loans		343
Nonperforming Assets
Nonperforming Assets [Line Items]
Nonaccrual loans	[1]	4,316	2,846
Accruing loans past due more than 90 days		0	0
Restructured loans	[2]	15	7,849
OREO		50	93
Repossessed assets		0	74
Total nonperforming assets		4,381	10,862
Nonperforming Assets | Construction Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		41	405
Nonperforming Assets | 1-4 Family Residential Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		2,365	848
Nonperforming Assets | Commercial Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		527	762
Nonperforming Assets | Commercial loans
Nonperforming Assets [Line Items]
Nonaccrual loans		1,358	757
Nonperforming Assets | Loans to individuals
Nonperforming Assets [Line Items]
Nonaccrual loans		$ 25	$ 74
[1]Includes $343,000 and $897,000 of restructured loans as of September 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 September 30, 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 - Restructured Loans (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) loans	Sep. 30, 2023 USD ($) loans	Dec. 31, 2022 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			$ 897
Amortization Period Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans		$ 343
Commercial loans | Amortization Period Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans		343
Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 80	$ 358
Number of loans | loans	2	4
Commercial Portfolio Segment | Amortization Period Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 15	$ 293
Commercial Portfolio Segment | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	0
Commercial Portfolio Segment | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	65	65
Commercial Portfolio Segment | Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 80	$ 358
Number of loans | loans	2	4
Total financing receivables, percentage	0.02%	0.09%
Commercial Portfolio Segment | Commercial loans | Amortization Period Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 15	$ 293
Commercial Portfolio Segment | Commercial loans | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	0
Commercial Portfolio Segment | Commercial loans | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 65	$ 65

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	$ 36,303	$ 35,449	$ 36,515	$ 35,273
Loans charged-off	(1,262)	(686)	(2,632)	(1,720)
Recoveries of loans charged-off	378	449	1,170	1,505
Net loans (charged-off) recovered	(884)	(237)	(1,462)	(215)
Provision for (reversal of) loan losses	6,341	1,294	6,707	1,448
Balance at end of period	41,760	36,506	41,760	36,506
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	3,395	3,399	3,164	3,787
Loans charged-off	0	0	(63)	0
Recoveries of loans charged-off	0	0	1	1
Net loans (charged-off) recovered	0	0	(62)	1
Provision for (reversal of) loan losses	1,019	136	1,312	(253)
Balance at end of period	4,414	3,535	4,414	3,535
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,660	2,024	2,173	1,866
Loans charged-off	0	(66)	(71)	(66)
Recoveries of loans charged-off	62	4	108	96
Net loans (charged-off) recovered	62	(62)	37	30
Provision for (reversal of) loan losses	17	44	529	110
Balance at end of period	2,739	2,006	2,739	2,006
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	28,012	27,221	28,701	26,980
Loans charged-off	0	0	0	0
Recoveries of loans charged-off	0	0	1	81
Net loans (charged-off) recovered	0	0	1	81
Provision for (reversal of) loan losses	4,327	1,273	3,637	1,433
Balance at end of period	32,339	28,494	32,339	28,494
Commercial loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,017	2,558	2,235	2,397
Loans charged-off	(744)	(192)	(1,113)	(369)
Recoveries of loans charged-off	65	139	268	469
Net loans (charged-off) recovered	(679)	(53)	(845)	100
Provision for (reversal of) loan losses	731	(272)	679	(264)
Balance at end of period	2,069	2,233	2,069	2,233
Municipal loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	37	46	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	(17)	(2)	(25)	(3)
Balance at end of period	20	44	20	44
Loans to individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	182	201	197	196
Loans charged-off	(518)	(428)	(1,385)	(1,285)
Recoveries of loans charged-off	251	306	792	858
Net loans (charged-off) recovered	(267)	(122)	(593)	(427)
Provision for (reversal of) loan losses	264	115	575	425
Balance at end of period	$ 179	$ 194	$ 179	$ 194

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) loans	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) loans	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 63		$ 63		$ 0
Reversal of interest income on nonaccrual loans	13	$ 10	78	$ 33
Nonaccrual loans, no allowance	1,000		1,000		1,600
Collateral-dependent loans	7,700		7,700		8,100
Restructured loans					897
Accrued interest receivable on our loan portfolio	20,300		20,300		$ 18,800
Amortization Period Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Restructured loans			$ 343
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term			20 years
Owner and nonowner-occupied real estate	1,750,000		$ 1,750,000
Loans secured by multi-family properties	339,400		339,400
Loans secured by farmland	$ 29,400		$ 29,400
Commercial loans | Amortization Period Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loans modified | loans	3		3
Restructured loans			$ 343
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		9 Months Ended	12 Months Ended
		Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Other borrowings		$ 395,209	$ 221,153
FHLB borrowings		212,829	153,358
Other borrowings:
Debt Instrument [Line Items]
Other borrowings		395,209	221,153
Average amount outstanding during the period	[1]	451,966	77,845
Maximum amount outstanding during the period	[2]	$ 1,030,421	$ 316,563
Weighted average interest rate during the period	[3]	4.80%	2.40%
Interest rate at end of the period	[4]	4.40%	4.10%
FHLB borrowings:
Debt Instrument [Line Items]
FHLB borrowings		$ 212,829	$ 153,358
Average amount outstanding during the period	[1]	281,260	135,926
Maximum amount outstanding during the period	[2]	$ 533,242	$ 423,645
Weighted average interest rate during the period	[3]	2.50%	2.40%
Interest rate at end of the period	[5]	1.40%	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	Sep. 30, 2023 USD ($)
Debt Instrument [Line Items]
Less than 1 Year	$ 599,621
1-2 Years	7,085
2-3 Years	582
3-4 Years	401
4-5 Years	349
Thereafter	0
Total	608,038
Other borrowings:
Debt Instrument [Line Items]
Less than 1 Year	388,888
1-2 Years	6,321
2-3 Years	0
3-4 Years	0
4-5 Years	0
Thereafter	0
Total	395,209
FHLB borrowings:
Debt Instrument [Line Items]
Less than 1 Year	210,733
1-2 Years	764
2-3 Years	582
3-4 Years	401
4-5 Years	349
Thereafter	0
Total	$ 212,829

Borrowing Arrangements Narrativ

Borrowing Arrangements Narrative (Details)	9 Months Ended
	Sep. 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)	2 years
Securities sold under repurchase agreements	$ 103,900,000	33,200,000
Federal Home Loan Bank borrowings, additional funding available	1,710,000,000
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	636,900,000
Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Additional funding available	$ 6,000
Minimum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	0.74%
Federal Home Loan Bank borrowings maturities	20 days
Maximum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	4.80%
Federal Home Loan Bank borrowings maturities	4 years 9 months 18 days
Federal Reserve Discount Window
Line of Credit Facility [Line Items]
Other borrowings	$ 0	$ 188,000,000
Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Other borrowings	$ 291,300,000

Long-term Debt Other Long-term

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

9 Months Ended

Sep. 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]

$ 93,838

$ 98,674

Trust preferred subordinated debentures

[2]

60,269

60,265

Total long-term debt

154,107

158,939

Southside Statutory Trust III, net of unamortized debt issuance costs

Debt Instruments [Abstract]

Trust preferred subordinated debentures

20,577

[2],[3]

20,573

[2],[3]

$ 20,619

Unamortized Debt Issuance Expense

42

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]

93,838

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 $42,000 at September 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 September 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

Sep. 30, 2023

Jun. 14, 2023

Dec. 31, 2022

Nov. 06, 2020

Oct. 10, 2007

Debt Instrument [Line Items]

Other long-term debt

[1]

$ 60,269

$ 60,265

Southside Statutory Trust III (2)

Debt Instrument [Line Items]

Other long-term debt

$ 20,619

20,577

[1],[2]

20,573

[1],[2]

Southside Statutory Trust III (2) | Three-Month Secured Overnight Financing Rate (SOFR)

Debt Instrument [Line Items]

Basis on variable rate

[3]

3.20%

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 Secured Overnight Financing Rate (SOFR)

Debt Instrument [Line Items]

Basis on variable rate

[3]

1.56%

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 Secured Overnight Financing Rate (SOFR)

Debt Instrument [Line Items]

Basis on variable rate

[3]

2.51%

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 Secured Overnight Financing Rate (SOFR)

Debt Instrument [Line Items]

Basis on variable rate

[3],[4]

2.06%

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 $42,000 at September 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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 942	$ 685	$ 2,828	$ 2,056
Expected return on assets	(1,143)	(1,461)	(3,430)	(4,384)
Net loss amortization	182	160	545	480
Net periodic benefit cost (income)	(19)	(616)	(57)	(1,848)
Retirement Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Interest cost	31	25	94	76
Expected return on assets	(47)	(58)	(140)	(174)
Net loss amortization	0	0	0	0
Net periodic benefit cost (income)	(16)	(33)	(46)	(98)
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	208	144	623	433
Expected return on assets	0	0	0	0
Net loss amortization	7	64	22	191
Net periodic benefit cost (income)	$ 215	$ 208	$ 645	$ 624

Employee Benefit Plans Narrativ

Employee Benefit Plans Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Noncash adjustment to employee benefit plan liabilities, consisting of changes in net loss	$ 567	$ 671

Derivative Financial Instrume_3

Derivative Financial Instruments and Hedging Activities - Schedule Of Derivative Instruments (Details) - USD ($)		Sep. 30, 2023	Dec. 31, 2022
Asset Derivative
Gross derivatives		$ 109,514,000	$ 82,306,000
Offsetting derivative assets		0	(171,000)
Cash collateral received/posted		(109,514,000)	(82,135,000)
Net derivatives included in the consolidated balance sheets	[1]	0	0
Liability Derivative
Gross derivatives		27,876,000	21,217,000
Offsetting derivative liabilities		0	(171,000)
Cash collateral received/posted		0	0
Net derivatives included in the consolidated balance sheets	[1]	27,876,000	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		0	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		39,409,000	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		42,229,000	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]	216,777,000	223,124,000
Asset Derivative
Gross derivatives		27,876,000	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]	216,777,000	223,124,000
Asset Derivative
Gross derivatives		0	0
Liability Derivative
Gross derivatives		$ 27,876,000	$ 21,046,000
[1]Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at September 30, 2023 or December 31, 2022. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.[2]Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

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 ($)		9 Months Ended	12 Months Ended
		Sep. 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]	$ 216,777,000	$ 223,124,000
Remaining Maturity		8 years 3 months 18 days	9 years
Weighted Average Receive Rate		5.91%	4.83%
Weighted Average Pay Rate		2.66%	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 4 months 24 days	2 years 3 months 18 days
Weighted Average Receive Rate		5.42%	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 7 months 6 days	6 years 3 months 18 days
Weighted Average Receive Rate		5.30%	3.42%
Weighted Average Pay Rate		3.19%	3.21%
Customer Counterparties | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 216,777,000	$ 223,124,000
Remaining Maturity		8 years 3 months 18 days	9 years
Weighted Average Receive Rate		2.66%	2.69%
Weighted Average Pay Rate		5.91%	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)	Sep. 30, 2023 USD ($) derivative_instrument	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Securities AFS, at estimated fair value	$ 1,335,560,000	$ 1,299,014,000
Cash collateral received from counterparties under master netting agreements	109,514,000	$ 82,135,000
Fair Value Hedging
Derivative [Line Items]
Securities AFS, at estimated fair value	$ 609,100,000
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		Sep. 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 $1,472,520 and $1,387,874, respectively)		$ 1,335,560	$ 1,299,014
Derivative assets	[1]	0	0
Derivative liabilities	[1]	27,876	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 $1,472,520 and $1,387,874, respectively)		224,209
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 $1,472,520 and $1,387,874, respectively)		708,543	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 $1,472,520 and $1,387,874, respectively)		13,396	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 $1,472,520 and $1,387,874, respectively)	[2]	379,387	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 $1,472,520 and $1,387,874, respectively)	[2]	10,025	10,431
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		4,378,873	4,111,176
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		3,962,889	3,880,664
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		0	0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		0	0
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		3,962,889	3,880,664
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments		5,072	5,235
Total asset fair value measurements		1,450,146	1,386,555
Total liability fair value measurements		27,876	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 $1,472,520 and $1,387,874, respectively)		224,209
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 $1,472,520 and $1,387,874, respectively)		708,543	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 $1,472,520 and $1,387,874, respectively)		13,396	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 $1,472,520 and $1,387,874, respectively)	[3]	379,387	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 $1,472,520 and $1,387,874, respectively)	[3]	10,025	10,431
Fair Value, Recurring | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		109,514	82,306
Derivative liabilities		27,876	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		5,072	5,235
Total asset fair value measurements		229,281	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 $1,472,520 and $1,387,874, respectively)		224,209
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 $1,472,520 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 $1,472,520 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 $1,472,520 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 $1,472,520 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		1,220,865	1,381,320
Total liability fair value measurements		27,876	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 $1,472,520 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 $1,472,520 and $1,387,874, respectively)		708,543	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 $1,472,520 and $1,387,874, respectively)		13,396	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 $1,472,520 and $1,387,874, respectively)	[3]	379,387	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 $1,472,520 and $1,387,874, respectively)	[3]	10,025	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		109,514	82,306
Derivative liabilities		27,876	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 $1,472,520 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 $1,472,520 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 $1,472,520 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 $1,472,520 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 $1,472,520 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		50	167
Total asset fair value measurements		7,187	7,982
Fair Value, Nonrecurring | Collateral Pledged
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	7,137	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 Pledged
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 Pledged
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		50	167
Total asset fair value measurements		7,187	7,982
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral Pledged
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	$ 7,137	$ 7,815
[1]Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. We had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers at September 30, 2023 or December 31, 2022. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.[2]All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.[3]All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.[4]Consists of individually evaluated loans. Loans for which the fair value of the collateral and commercial real estate fair value of the properties is less than cost basis are presented net of allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.

Fair Value Measurement - Balanc

Fair Value Measurement - Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 325,823	$ 199,252
Investment securities:
HTM, at carrying value	1,185,474	1,190,108
Mortgage-backed securities:
HTM, at carrying value	122,412	136,621
FHLB stock, at cost	12,778	9,190
Equity investments	4,382	5,946
Loans, net of allowance for loan losses	4,378,873	4,111,176
Loans held for sale	1,382	667
Financial liabilities:
Deposits	6,349,571	6,198,019
Other borrowings	395,209	221,153
FHLB borrowings	212,829	153,358
Subordinated notes, net of unamortized debt issuance costs	93,838	98,674
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,269	60,265
Estimated Fair Value
Financial assets:
Cash and cash equivalents	325,823	199,252
Investment securities:
HTM, at carrying value	944,586	1,023,376
Mortgage-backed securities:
HTM, at carrying value	107,844	125,780
FHLB stock, at cost	12,778	9,190
Equity investments	4,382	5,946
Loans, net of allowance for loan losses	3,962,889	3,880,664
Loans held for sale	1,382	667
Financial liabilities:
Deposits	6,315,058	6,158,517
Other borrowings	393,551	221,153
FHLB borrowings	198,457	140,976
Subordinated notes, net of unamortized debt issuance costs	84,992	91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs	52,568	60,594
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	325,823	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	944,586	1,023,376
Mortgage-backed securities:
HTM, at carrying value	107,844	125,780
FHLB stock, at cost	12,778	9,190
Equity investments	4,382	5,946
Loans, net of allowance for loan losses	0	0
Loans held for sale	1,382	667
Financial liabilities:
Deposits	6,315,058	6,158,517
Other borrowings	393,551	221,153
FHLB borrowings	198,457	140,976
Subordinated notes, net of unamortized debt issuance costs	84,992	91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs	52,568	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	3,962,889	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)	9 Months Ended
	Sep. 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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Current income tax expense	$ 4,672	$ 4,415	$ 14,099	$ 10,215
Deferred income tax expense (benefit)	(1,552)	(540)	(1,868)	103
Income tax expense	$ 3,120	$ 3,875	$ 12,231	$ 10,318

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Deferred tax assets, net	$ 41,200,000		$ 41,200,000		$ 34,700,000
Deferred tax assets, valuation allowance	0		0		$ 0
Income tax expense	$ 3,120,000	$ 3,875,000	$ 12,231,000	$ 10,318,000
Effective income tax rate, percent	14.50%	12.60%	15%	11.80%

Off-Balance-Sheet Arrangement_3

Off-Balance-Sheet Arrangements, Allowance for off-balance-sheet credit exposures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 3,207	$ 1,891	$ 3,687	$ 2,384
Provision for (reversal of) off-balance-sheet credit exposures	646	200	166	(293)
Balance at end of period	$ 3,853	$ 2,091	$ 3,853	$ 2,091

Off-Balance-Sheet Arrangement_4

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 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	$ 1,177,289	$ 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	1,160,638	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	$ 16,651	$ 26,844

Off-Balance-Sheet Arrangement_5

Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 1,500,000	$ 603,000	$ 1,500,000
Operating lease ROU assets	14,948,000		14,948,000		$ 15,314,000
Unsettled trades to purchase securities	24,917,000	$ 0	24,917,000	$ 0	0
Unsettled trades to sell securities	0		0		0
Unsettled Issuances of Brokered CDs	$ 0		$ 0		$ 0