Southside Bancshares (SBSI) 10-Q 28 Oct 24 2024 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2024	Oct. 23, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
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		30,308,414
Entity Central Index Key	0000705432
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
ASSETS
Cash and due from banks		$ 130,147	$ 122,021
Interest earning deposits		333,825	391,719
Federal funds sold		22,325	46,770
Total cash and cash equivalents		486,297	560,510
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively)		1,408,437	1,296,294
Securities HTM (estimated fair value of $1,169,523 and $1,166,162, respectively)		1,288,403	1,307,053
FHLB stock, at cost		40,291	11,936
Equity investments		9,722	9,691
Loans held for sale		768	10,894
Loans:
Loans		4,578,048	4,524,510
Less: Allowance for loan losses		(44,276)	(42,674)
Net loans		4,533,772	4,481,836
Premises and equipment, net		138,811	138,950
Operating lease ROU assets		14,007	14,837
Goodwill		201,116	201,116
Other intangible assets, net		2,003	2,925
Interest receivable		37,888	50,489
Deferred tax asset, net		32,643	30,426
BOLI		137,489	136,330
Other assets		30,616	31,627
Total assets		8,362,263	8,284,914
Deposits:
Noninterest bearing		1,377,022	1,390,407
Interest bearing		5,058,680	5,159,274
Total deposits		6,435,702	6,549,681
Other borrowings		105,810	509,820
FHLB borrowings		760,046	212,648
Subordinated notes, net of unamortized debt issuance costs	[1]	92,006	93,877
Trust preferred subordinated debentures, net of unamortized debt issuance costs		60,273	60,270
Unsettled trades to purchase securities		19,904	0
Operating lease liabilities		15,919	16,704
Other liabilities		67,349	68,626
Total liabilities		7,557,009	7,511,626
Off-balance-sheet arrangements, commitments and contingencies (Note 12)
Shareholders’ equity:
Common stock:  ($1.25 par value, 80,000,000 shares authorized, 38,070,150 shares issued at September 30, 2024 and 38,039,706 shares issued at December 31, 2023)		47,588	47,550
Paid-in capital		792,249	788,840
Retained earnings		316,050	282,355
Treasury stock: (shares at cost, 7,762,336 at September 30, 2024 and 7,790,276 at December 31, 2023)		(232,134)	(231,995)
AOCI		(118,499)	(113,462)
Total shareholders’ equity		805,254	773,288
Total liabilities and shareholders’ equity		$ 8,362,263	$ 8,284,914
[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, 2024	Dec. 31, 2023
Available-for-sale [Abstract]
Securities AFS, at estimated fair value	$ 1,433,097	$ 1,332,467
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held-to-maturity, fair value	$ 1,169,523	$ 1,166,162
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)	38,070,150	38,039,706
Shares purchased (in shares)	7,762,336	7,790,276

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income:
Loans	$ 71,896	$ 64,110	$ 209,791	$ 177,570
Taxable investment securities	7,150	8,731	21,126	23,216
Tax-exempt investment securities	9,813	13,758	31,611	41,394
MBS	11,976	4,426	33,179	12,585
FHLB stock and equity investments	582	265	1,488	889
Other interest earning assets	4,286	1,788	15,452	5,148
Total interest income	105,703	93,078	312,647	260,802
Interest expense:
Deposits	38,532	30,951	115,196	72,536
FHLB borrowings	6,488	1,174	18,893	5,347
Subordinated notes	937	962	2,829	2,955
Trust preferred subordinated debentures	1,180	1,178	3,526	3,309
Other borrowings	3,102	5,540	9,783	16,113
Total interest expense	50,239	39,805	150,227	100,260
Net interest income	55,464	53,273	162,420	160,542
Provision for (reversal of) credit losses	2,389	6,987	1,962	6,873
Net interest income after provision for credit losses	53,075	46,286	160,458	153,669
Noninterest income:
Deposit services	6,199	6,479	18,341	19,192
Net gain (loss) on sale of securities AFS	(1,929)	11	(2,510)	(5,590)
Net gain on sale of equity securities	0	0	0	5,058
Gain (loss) on sale of loans	115	96	(101)	385
Trust fees	1,628	1,522	4,420	4,479
BOLI	857	790	3,408	3,221
Brokerage services	1,068	760	3,163	2,361
Other	233	1,178	2,731	4,227
Total noninterest income	8,171	10,836	29,452	33,333
Noninterest expense:
Salaries and employee benefits	22,233	21,241	67,330	64,473
Net occupancy	3,613	3,796	10,725	11,220
Advertising, travel & entertainment	734	1,062	2,479	2,966
ATM expense	412	358	1,105	1,033
Professional fees	1,206	1,472	3,435	4,036
Software and data processing	2,951	2,432	8,667	6,751
Communications	423	359	1,282	1,034
FDIC insurance	939	902	2,859	2,666
Amortization of intangibles	278	407	922	1,327
Other	3,543	3,524	10,174	9,889
Total noninterest expense	36,332	35,553	108,978	105,395
Income before income tax expense	24,914	21,569	80,932	81,607
Income tax expense	4,390	3,120	14,224	12,231
Net income	$ 20,524	$ 18,449	$ 66,708	$ 69,376
Earnings per common share - basic (in dollars per share)	$ 0.68	$ 0.60	$ 2.20	$ 2.25
Earnings per common share - diluted (in dollars per share)	0.68	0.60	2.20	2.24
Cash dividends paid per common share (in dollars per share)	$ 0.36	$ 0.35	$ 1.08	$ 1.05

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 20,524	$ 18,449	$ 66,708	$ 69,376
Securities AFS and transferred securities:
Change in unrealized holding gain (loss) on AFS securities during the period	6,593	(52,882)	(1,094)	(33,032)
Reclassification adjustment for amortization related to AFS and HTM debt securities	2,119	2,008	6,210	5,989
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income	1,929	(11)	2,510	5,590
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	(13,658)	7,377	4,641	16,277
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges	(5,688)	(6,408)	(18,112)	(17,570)
Pension plans:
Amortization of net actuarial loss, included in net periodic benefit cost	156	189	471	567
Change in net actuarial loss	(1,002)	0	(1,002)	0
Other comprehensive income (loss), before tax	(9,551)	(49,727)	(6,376)	(22,179)
Income tax (expense) benefit related to items of other comprehensive income (loss)	2,006	10,443	1,339	4,658
Other comprehensive income (loss), net of tax	(7,545)	(39,284)	(5,037)	(17,521)
Comprehensive income (loss)	$ 12,979	$ (20,835)	$ 61,671	$ 51,855

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, 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)
Beginning balance, net of tax at Dec. 31, 2023	773,288	47,550	788,840	282,355	(231,995)	(113,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,511			21,511
Other comprehensive income (loss)	2,603					2,603
Issuance of common stock for dividend reinvestment plan	306	13	293
Stock compensation expense	756		756
Net issuance of common stock under employee stock plans	350		75	(95)	370
Cash dividends paid on common stock	(10,892)			(10,892)
Ending balance, net of tax at Mar. 31, 2024	787,922	47,563	789,964	292,879	(231,625)	(110,859)
Beginning balance, net of tax at Dec. 31, 2023	773,288	47,550	788,840	282,355	(231,995)	(113,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	66,708
Other comprehensive income (loss)	(5,037)
Ending balance, net of tax at Sep. 30, 2024	805,254	47,588	792,249	316,050	(232,134)	(118,499)
Beginning balance, net of tax at Mar. 31, 2024	787,922	47,563	789,964	292,879	(231,625)	(110,859)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,673			24,673
Other comprehensive income (loss)	(95)					(95)
Issuance of common stock for dividend reinvestment plan	290	14	276
Purchase of common stock	(1,510)				(1,510)
Stock compensation expense	761		761
Net issuance of common stock under employee stock plans	(166)		(442)	(95)	371
Cash dividends paid on common stock	(10,905)			(10,905)
Ending balance, net of tax at Jun. 30, 2024	800,970	47,577	790,559	306,552	(232,764)	(110,954)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,524			20,524
Other comprehensive income (loss)	(7,545)					(7,545)
Issuance of common stock for dividend reinvestment plan	290	11	279
Stock compensation expense	987		987
Net issuance of common stock under employee stock plans	933		424	(121)	630
Cash dividends paid on common stock	(10,905)			(10,905)
Ending balance, net of tax at Sep. 30, 2024	$ 805,254	$ 47,588	$ 792,249	$ 316,050	$ (232,134)	$ (118,499)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for dividend reinvestment plan (in shares)	8,701	11,060	10,683	10,007	10,390	8,026
Common stock purchased (in shares)		57,966		212,388	618,831	457,394
Net issuance of common stock under employee stock plans (in shares)	38,553	23,778	23,575	8,670	19,065	23,919
Cash dividends paid on common stock (in dollars per share)	$ 0.36	$ 0.36	$ 0.36	$ 0.35	$ 0.35	$ 0.35

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES:
Net income	$ 66,708	$ 69,376
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	7,518	7,972
Securities premium amortization (discount accretion), net	4,657	3,791
Loan (discount accretion) premium amortization, net	298	296
Provision for (reversal of) credit losses	1,962	6,873
Stock compensation expense	2,504	2,713
Deferred tax expense (benefit)	(878)	(1,868)
Net (gain) loss on sale of AFS securities	2,510	5,590
Net gain on sale of equity securities	0	(5,058)
Loss on impairment of investments	868	0
Net loss on premises and equipment	28	106
Gross proceeds from sales of loans held for sale	13,423	12,941
Gross originations of loans held for sale	(11,289)	(13,656)
Net (gain) loss on consumer receivables	412	0
Net (gain) loss on OREO	95	(53)
Gain on purchase of subordinated notes	(178)	(587)
Net change in:
Interest receivable	12,601	9,704
Other assets	(39,564)	(5,665)
Interest payable	(449)	10,545
Other liabilities	1,815	33,434
Net cash provided by (used in) operating activities	63,041	136,454
Securities AFS:
Purchases	(752,237)	(1,137,694)
Sales	126,248	747,434
Maturities, calls and principal repayments	545,836	324,964
Securities HTM:
Maturities, calls and principal repayments	20,951	21,010
Proceeds from sales of equity securities	0	6,679
Proceeds from redemption of FHLB stock and equity investments	56,115	30,767
Purchases of FHLB stock and equity investments	(84,501)	(34,249)
Net loan paydowns (originations)	(50,985)	(274,843)
Proceeds from sales of customer receivables	7,600	0
Purchases of premises and equipment	(6,094)	(5,071)
Proceeds from (purchases of) BOLI	4,035	951
Proceeds from sales of premises and equipment	17	430
Net proceeds from sales of OREO	278	146
Proceeds from sales of repossessed assets	114	168
Net cash provided by (used in) investing activities	(132,623)	(319,308)
FINANCING ACTIVITIES:
Net change in deposits	(114,005)	151,446
Net change in other borrowings	(404,010)	174,056
Proceeds from FHLB borrowings	6,068,951	1,659,000
Repayment of FHLB borrowings	(5,521,553)	(1,599,529)
Purchase/redemption of subordinated notes	(1,805)	(4,365)
Proceeds from stock option exercises	1,403	705
Cash paid to tax authority related to tax withholding on share-based awards	(286)	(281)
Purchase of common stock	(1,510)	(40,120)
Proceeds from the issuance of common stock for dividend reinvestment plan	886	908
Cash dividends paid	(32,702)	(32,395)
Net cash provided by (used in) financing activities	(4,631)	309,425
Net increase (decrease) in cash and cash equivalents	(74,213)	126,571
Cash and cash equivalents at beginning of period	560,510	199,252
Cash and cash equivalents at end of period	486,297	325,823
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	150,676	89,715
Income taxes paid	12,000	12,250
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	806	127
Unsettled trades to purchase securities	19,904	24,917
Unsettled trades to repurchase common stock	$ 0	$ 541

Summary of Significant Accounti

Summary of Significant Accounting and Reporting Policies	9 Months Ended
	Sep. 30, 2024
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 2023 Form 10-K. Accounting Changes and Reclassifications

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per common share is calculated based on the two-class method in accordance with ASC Topic 260, “Earnings Per Share.” ASC 260 provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the calculation of earnings per share pursuant to the two-class method. We have determined that our director’s deferred RSUs are participating securities. Under the two-class method, basic earnings per common share is calculated by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the period, excluding outstanding participating securities. Diluted earnings per common share is calculated using the weighted-average number of shares determined for the basic earnings per common share calculation plus the dilutive effect of stock awards using the treasury stock method. 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 2024 2023 2024 2023 Basic and Diluted Earnings: Net income $ 20,524 $ 18,449 $ 66,708 $ 69,376 Less: Earnings allocated to participating securities 14 10 41 29 Net income available to common shareholders $ 20,510 $ 18,439 $ 66,667 $ 69,347 Basic weighted-average shares outstanding 30,286 30,502 30,276 30,862 Add: Stock awards 84 41 56 54 Diluted weighted-average shares outstanding 30,370 30,543 30,332 30,916 Basic earnings per share: Net income $ 0.68 $ 0.60 $ 2.20 $ 2.25 Diluted earnings per share: Net income $ 0.68 $ 0.60 $ 2.20 $ 2.24 For the three and nine months ended September 30, 2024, there were approximately 539,000 and 534,000 anti-dilutive shares outstanding, respectively. For the three and nine months ended September 30, 2023, there were 611,000 and 571,000 anti-dilutive shares outstanding, respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2024
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, 2024 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (109,881) $ 17,444 $ (18,517) $ (110,954) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications 6,593 (13,658) (1,002) (8,067) Reclassification adjustments included in net income 4,048 (5,688) 156 (1,484) Income tax (expense) benefit (2,235) 4,063 178 2,006 Net current-period other comprehensive income (loss), net of tax 8,406 (15,283) (668) (7,545) Ending balance, net of tax $ (101,475) $ 2,161 $ (19,185) $ (118,499) Nine Months Ended September 30, 2024 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (107,499) $ 12,803 $ (18,766) $ (113,462) Other comprehensive income (loss): Other comprehensive (loss) income before reclassifications (1,094) 4,641 (1,002) 2,545 Reclassification adjustments included in net income 8,720 (18,112) 471 (8,921) Income tax (expense) benefit (1,602) 2,829 112 1,339 Net current-period other comprehensive income (loss), net of tax 6,024 (10,642) (419) (5,037) Ending balance, net of tax $ (101,475) $ 2,161 $ (19,185) $ (118,499) 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 income (loss) 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) 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 2024 2023 2024 2023 Unrealized gains and losses on securities transferred: Amortization of unrealized gains and losses (1) $ (2,119) $ (2,008) $ (6,210) $ (5,989) Tax benefit 445 422 1,304 1,258 Net of tax (1,674) (1,586) (4,906) (4,731) Unrealized gains and losses on available for sale securities: Realized net gain (loss) on sale of securities (2) (1,929) 11 (2,510) (5,590) Tax (expense) benefit 405 (2) 527 1,174 Net of tax (1,524) 9 (1,983) (4,416) Derivatives: Realized net gain (loss) on interest rate swap derivatives (3) 5,688 6,408 18,112 17,570 Tax benefit (1,195) (1,346) (3,804) (3,690) Net of tax 4,493 5,062 14,308 13,880 Amortization of pension plan: Net actuarial loss (4) (156) (189) (471) (567) Tax benefit 33 40 99 119 Net of tax (123) (149) (372) (448) Total reclassifications for the period, net of tax $ 1,172 $ 3,336 $ 7,047 $ 4,285 (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, 2024
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, 2024 and December 31, 2023 are reflected in the tables below (in thousands): September 30, 2024 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 174,076 $ 91 $ — $ 174,167 State and political subdivisions 468,836 135 32,044 436,927 Corporate bonds and other 14,626 147 414 14,359 MBS: (1) Residential 770,310 10,016 2,233 778,093 Commercial 5,249 81 439 4,891 Total $ 1,433,097 $ 10,470 $ 35,130 $ 1,408,437 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,040,876 $ 8,810 $ 110,543 $ 939,143 Corporate bonds and other 131,456 157 10,387 121,226 MBS: (1) Residential 86,321 19 5,493 80,847 Commercial 29,750 — 1,443 28,307 Total $ 1,288,403 $ 8,986 $ 127,866 $ 1,169,523 December 31, 2023 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 139,706 $ 19 $ — $ 139,725 State and political subdivisions 603,913 362 35,530 568,745 Corporate bonds and other 14,569 31 507 14,093 MBS: (1) Residential 569,039 3,202 3,258 568,983 Commercial 5,240 44 536 4,748 Total $ 1,332,467 $ 3,658 $ 39,831 $ 1,296,294 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,039,440 $ 10,070 $ 126,233 $ 923,277 Corporate bonds and other 146,712 488 15,738 131,462 MBS: (1) Residential 90,619 13 7,263 83,369 Commercial 30,282 — 2,228 28,054 Total $ 1,307,053 $ 10,571 $ 151,462 $ 1,166,162 (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 and our intent and ability to hold these securities until maturity. We did not transfer any securities from AFS to HTM during the nine months ended September 30, 2024 or the year ended December 31, 2023. The remaining net unamortized, unrealized loss on the transferred securities included in AOCI in the accompanying balance sheets totaled $107.3 million ($84.8 million, net of tax) at September 30, 2024 and $113.5 million ($89.7 million, net of tax) at December 31, 2023. 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. Investment securities and MBS with carrying values of $2.10 billion and $2.28 billion were pledged as of September 30, 2024 and December 31, 2023, respectively, to collateralize 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. At September 30, 2024 and December 31, 2023, the amount of excess collateral at the FRDW was $352.6 million and $213.1 million, respectively. 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, 2024 and December 31, 2023, segregated by major security type and length of time in a continuous loss position (in thousands): September 30, 2024 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 $ — $ — $ 414,965 $ 32,044 $ 414,965 $ 32,044 Corporate bonds and other 2,926 74 6,377 340 9,303 414 MBS: Residential 19,843 63 34,116 2,170 53,959 2,233 Commercial — — 2,552 439 2,552 439 Total $ 22,769 $ 137 $ 458,010 $ 34,993 $ 480,779 $ 35,130 HELD TO MATURITY Investment securities: State and political subdivisions $ 22,229 $ 224 $ 737,971 $ 110,319 $ 760,200 $ 110,543 Corporate bonds and other 6,137 143 107,409 10,244 113,546 10,387 MBS: Residential — — 80,287 5,493 80,287 5,493 Commercial — — 28,307 1,443 28,307 1,443 Total $ 28,366 $ 367 $ 953,974 $ 127,499 $ 982,340 $ 127,866 December 31, 2023 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 $ 26,371 $ 297 $ 516,520 $ 35,233 $ 542,891 $ 35,530 Corporate bonds and other 8,103 319 5,071 188 13,174 507 MBS: Residential 150,865 549 36,864 2,709 187,729 3,258 Commercial — — 2,484 536 2,484 536 Total $ 185,339 $ 1,165 $ 560,939 $ 38,666 $ 746,278 $ 39,831 HELD TO MATURITY Investment securities: State and political subdivisions $ 16,549 $ 123 $ 713,499 $ 126,110 $ 730,048 $ 126,233 Corporate bonds and other 9,956 1,135 114,787 14,603 124,743 15,738 MBS: Residential — — 82,747 7,263 82,747 7,263 Commercial — — 28,054 2,228 28,054 2,228 Total $ 26,505 $ 1,258 $ 939,087 $ 150,204 $ 965,592 $ 151,462 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. During the three months ended September 30, 2024, we recognized an impairment loss of $868,000 for AFS securities which were sold subsequent to September 30, 2024. 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, 2024 and December 31, 2023, 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. We had 271 AFS debt securities in an unrealized loss position at September 30, 2024. 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 primarily 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. As of September 30, 2024, two bonds were rated below investment grade. The model determined any expected credit loss over the life of these securities to be insignificant. Management further evaluated the remote expectation of loss on the remainder of the HTM portfolio, along with the qualitative factors associated with these securities and concluded that, due to the securities being highly rated municipals and primarily investment grade corporates, 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, 2024 or 2023. 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, 2024, accrued interest receivable on AFS and HTM debt securities totaled $8.4 million and $8.2 million, respectively. As of December 31, 2023, accrued interest receivable on AFS and HTM debt securities totaled $15.4 million and $13.7 million, respectively. No HTM debt securities were past-due or on nonaccrual status as of September 30, 2024 or December 31, 2023. The following table reflects interest income recognized on securities for the periods presented (in thousands): Three Months Ended 2024 2023 U.S. Treasury $ 2,315 $ 3,784 State and political subdivisions 12,994 16,940 Corporate bonds and other 1,654 1,765 MBS 11,976 4,426 Total interest income on securities $ 28,939 $ 26,915 Nine Months Ended 2024 2023 U.S. Treasury $ 6,404 $ 8,307 State and political subdivisions 41,151 50,940 Corporate bonds and other 5,182 5,363 MBS 33,179 12,585 Total interest income on securities $ 85,916 $ 77,195 There was a $2.5 million net realized loss as a result of sales from the AFS securities portfolio for the nine months ended September 30, 2024, which consisted of $6.1 million in realized losses and $88,000 in realized gains, offset by a net gain of $3.5 million on the unwinding of fair value hedges on municipal securities in the AFS securities portfolio. In addition, during the three months ended September 30, 2024, we recorded an impairment charge of $868,000 consisting of a loss of $685,000 on the sale of approximately $10.0 million of AFS municipal securities and a loss of $183,000 on the unwind of the related fair value hedges, sold on October 1, 2024. 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 were no sales from the HTM portfolio during the three and nine months ended September 30, 2024 or 2023. 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, 2024, are presented below by contractual maturity (in thousands): September 30, 2024 Amortized Cost Fair Value AVAILABLE FOR SALE Investment securities: Due in one year or less $ 176,356 $ 176,436 Due after one year through five years 1,797 1,810 Due after five years through ten years 25,600 25,193 Due after ten years 453,785 422,014 657,538 625,453 MBS: 775,559 782,984 Total $ 1,433,097 $ 1,408,437 September 30, 2024 Amortized Cost Fair Value HELD TO MATURITY Investment securities: Due in one year or less $ 4,118 $ 4,087 Due after one year through five years 11,920 11,695 Due after five years through ten years 141,206 131,105 Due after ten years 1,015,088 913,482 1,172,332 1,060,369 MBS: 116,071 109,154 Total $ 1,288,403 $ 1,169,523 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, 2024 and December 31, 2023, we had equity investments recorded in our consolidated balance sheets of $9.7 million. Any realized and unrealized gains and losses on equity investments are reported in income. Equity investments without readily determinable fair values are recorded at cost less impairment, if any. For the three and nine months ended September 30, 2024, there was no gain or loss on the sale of equity securities. 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 2024 2023 2024 2023 Net gains (losses) recognized during the period on equity investments $ 191 $ (163) $ 112 $ 4,895 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 $ 191 $ (163) $ 112 $ (163) 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, 2024. 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, 2024, 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, 2024
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, 2024 December 31, 2023 Real estate loans: Construction $ 585,817 $ 789,744 1-4 family residential 755,406 696,738 Commercial 2,422,612 2,168,451 Commercial loans 358,854 366,893 Municipal loans 402,041 441,168 Loans to individuals 53,318 61,516 Total loans 4,578,048 4,524,510 Less: Allowance for loan losses 44,276 42,674 Net loans $ 4,533,772 $ 4,481,836 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 real estate loan 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 mortgage 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, 2024 consisted of $1.85 billion of owner and non-owner occupied real estate, $547.7 million of loans secured by multi-family properties and $27.7 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 have made 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. These loans allow 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. Watch List loans reported as 2024 originations as of September 30, 2024 and Watch List loans reported as 2023 originations as of December 31, 2023 were, for the majority, first originated in various years prior to 2024 and 2023, respectively, but were renewed in the respective 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, 2024 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Amortized Cost Basis Total 2024 2023 2022 2021 2020 Prior Construction real estate: Pass $ 71,994 $ 125,687 $ 99,870 $ 17,993 $ 4,052 $ 7,019 $ 161,656 $ 488,271 Pass watch 220 — 71,129 — 441 — 1,232 73,022 Special mention — — — 610 — 74 — 684 Substandard — 114 23,653 61 — — — 23,828 Doubtful — — — — — 12 — 12 Total construction real estate $ 72,214 $ 125,801 $ 194,652 $ 18,664 $ 4,493 $ 7,105 $ 162,888 $ 585,817 Current period gross charge-offs $ — $ 24 $ — $ — $ — $ — $ — $ 24 1-4 family residential real estate: Pass $ 39,810 $ 64,391 $ 157,973 $ 144,490 $ 108,906 $ 233,187 $ 1,598 $ 750,355 Pass watch — — — — — — — — Special mention — — — 508 — — — 508 Substandard 50 225 — 231 1,167 2,662 — 4,335 Doubtful — — — — — 208 — 208 Total 1-4 family residential real estate $ 39,860 $ 64,616 $ 157,973 $ 145,229 $ 110,073 $ 236,057 $ 1,598 $ 755,406 Current period gross charge-offs $ — $ 31 $ — $ — $ 10 $ 220 $ — $ 261 Commercial real estate: Pass $ 167,260 $ 469,960 $ 658,916 $ 571,720 $ 168,752 $ 250,200 $ 4,967 $ 2,291,775 Pass watch — 15,094 54,106 — 2,430 11,194 — 82,824 Special mention 4,005 — 19,436 563 — 13,393 — 37,397 Substandard — 3,722 835 87 255 5,597 — 10,496 Doubtful — — — — — 120 — 120 Total commercial real estate $ 171,265 $ 488,776 $ 733,293 $ 572,370 $ 171,437 $ 280,504 $ 4,967 $ 2,422,612 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial loans: Pass $ 65,558 $ 66,550 $ 58,740 $ 15,720 $ 6,927 $ 3,541 $ 126,939 $ 343,975 Pass watch — 32 697 985 74 588 4,375 6,751 Special mention 409 2,018 171 263 — 117 2,289 5,267 Substandard 61 283 1,042 32 — 16 1,027 2,461 Doubtful 99 64 120 69 — 48 — 400 Total commercial loans $ 66,127 $ 68,947 $ 60,770 $ 17,069 $ 7,001 $ 4,310 $ 134,630 $ 358,854 Current period gross charge-offs $ 23 $ 310 $ 83 $ 67 $ — $ 11 $ — $ 494 Municipal loans: Pass $ 1,949 $ 35,057 $ 59,447 $ 65,666 $ 43,395 $ 196,527 $ — $ 402,041 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 1,949 $ 35,057 $ 59,447 $ 65,666 $ 43,395 $ 196,527 $ — $ 402,041 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 16,564 $ 13,034 $ 9,161 $ 7,095 $ 3,502 $ 1,256 $ 2,607 $ 53,219 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard 11 2 53 — — 11 — 77 Doubtful — 4 15 3 — — — 22 Total loans to individuals $ 16,575 $ 13,040 $ 9,229 $ 7,098 $ 3,502 $ 1,267 $ 2,607 $ 53,318 Current period gross charge-offs (1) $ 1,212 $ 33 $ 37 $ 2 $ 33 $ 32 $ — $ 1,349 Total loans $ 367,990 $ 796,237 $ 1,215,364 $ 826,096 $ 339,901 $ 725,770 $ 306,690 $ 4,578,048 Total current period gross charge-offs (1) $ 1,235 $ 398 $ 120 $ 69 $ 43 $ 263 $ — $ 2,128 (1) Includes $900,000 in charged off demand deposit overdrafts reported as 2024 originations. December 31, 2023 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Amortized Cost Basis Total 2023 2022 2021 2020 2019 Prior Construction real estate: Pass $ 132,838 $ 236,573 $ 196,311 $ 37,997 $ 3,938 $ 6,457 $ 144,358 $ 758,472 Pass watch — 7,798 — — — — — 7,798 Special mention 13,166 9,456 698 — 7 — — 23,327 Substandard 36 — 68 — — 43 — 147 Doubtful — — — — — — — — Total construction real estate $ 146,040 $ 253,827 $ 197,077 $ 37,997 $ 3,945 $ 6,500 $ 144,358 $ 789,744 Current period gross charge-offs $ — $ 92 $ — $ — $ — $ — $ — $ 92 1-4 family residential real estate: Pass $ 41,520 $ 126,981 $ 145,671 $ 114,631 $ 63,710 $ 196,651 $ 1,803 $ 690,967 Pass watch — — — 32 — — — 32 Special mention — — — 75 — — — 75 Substandard 325 — 73 1,379 — 3,259 74 5,110 Doubtful — — — 163 — 391 — 554 Total 1-4 family residential real estate $ 41,845 $ 126,981 $ 145,744 $ 116,280 $ 63,710 $ 200,301 $ 1,877 $ 696,738 Current period gross charge-offs $ — $ — $ — $ — $ 1 $ 118 $ — $ 119 Commercial real estate: Pass $ 469,844 $ 641,577 $ 495,363 $ 143,150 $ 91,085 $ 189,021 $ 16,493 $ 2,046,533 Pass watch 24,300 34,424 255 1,037 333 146 — 60,495 Special mention 17,403 — — — 9,746 25,072 — 52,221 Substandard — 862 95 269 1,565 6,346 — 9,137 Doubtful — — — — 65 — — 65 Total commercial real estate $ 511,547 $ 676,863 $ 495,713 $ 144,456 $ 102,794 $ 220,585 $ 16,493 $ 2,168,451 Current period gross charge-offs $ — $ — $ — $ — $ 788 $ — $ — $ 788 Commercial loans: Pass $ 78,090 $ 62,192 $ 42,114 $ 10,708 $ 4,356 $ 3,310 $ 161,153 $ 361,923 Pass watch — 128 117 — — 18 — 263 Special mention 191 174 — 16 — 162 — 543 Substandard 14 2,357 73 — 65 12 821 3,342 Doubtful 238 267 133 — 64 120 — 822 Total commercial loans $ 78,533 $ 65,118 $ 42,437 $ 10,724 $ 4,485 $ 3,622 $ 161,974 $ 366,893 Current period gross charge-offs $ 745 $ 440 $ 44 $ 26 $ 23 $ 5 $ — $ 1,283 Municipal loans: Pass $ 39,028 $ 61,429 $ 68,979 $ 49,746 $ 39,949 $ 182,037 $ — $ 441,168 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 39,028 $ 61,429 $ 68,979 $ 49,746 $ 39,949 $ 182,037 $ — $ 441,168 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 22,788 $ 15,503 $ 11,588 $ 6,256 $ 2,180 $ 941 $ 2,216 $ 61,472 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — 13 — — 13 Doubtful 4 17 — 10 — — — 31 Total loans to individuals $ 22,792 $ 15,520 $ 11,588 $ 6,266 $ 2,193 $ 941 $ 2,216 $ 61,516 Current period gross charge-offs $ 1,682 $ 54 $ 61 $ 20 $ 6 $ 99 $ — $ 1,922 Total loans $ 839,785 $ 1,199,738 $ 961,538 $ 365,469 $ 217,076 $ 613,986 $ 326,918 $ 4,524,510 Total current period gross charge-offs (1) $ 2,427 $ 586 $ 105 $ 46 $ 818 $ 222 $ — $ 4,204 (1) Includes $1.7 million in charged off demand deposit overdrafts reported as 2023 originations. The following tables present the aging of the amortized cost basis in past due loans by class of loans (in thousands): September 30, 2024 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 $ 320 $ — $ — $ 320 $ 585,497 $ 585,817 1-4 family residential 439 471 55 965 754,441 755,406 Commercial 194 3,837 30 4,061 2,418,551 2,422,612 Commercial loans 879 1,150 642 2,671 356,183 358,854 Municipal loans — — — — 402,041 402,041 Loans to individuals 68 15 — 83 53,235 53,318 Total $ 1,900 $ 5,473 $ 727 $ 8,100 $ 4,569,948 $ 4,578,048 December 31, 2023 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days Total Past Due Current Total Real estate loans: Construction $ 474 $ — $ 29 $ 503 $ 789,241 $ 789,744 1-4 family residential 4,638 774 1,700 7,112 689,626 696,738 Commercial 621 34 40 695 2,167,756 2,168,451 Commercial loans 1,693 347 127 2,167 364,726 366,893 Municipal loans 27 — — 27 441,141 441,168 Loans to individuals 107 1 10 118 61,398 61,516 Total $ 7,560 $ 1,156 $ 1,906 $ 10,622 $ 4,513,888 $ 4,524,510 The following table sets forth the amortized cost basis of nonperforming assets for the periods presented (in thousands): September 30, 2024 December 31, 2023 Nonaccrual loans: Real estate loans: Construction $ 150 $ 29 1-4 family residential 1,346 2,093 Commercial 3,929 528 Commercial loans 1,796 1,208 Loans to individuals 33 31 Total nonaccrual loans (1) 7,254 3,889 Accruing loans past due more than 90 days — — Restructured loans — 13 OREO 388 99 Repossessed assets 14 — Total nonperforming assets $ 7,656 $ 4,001 (1) Includes $362,000 and $506,000 of restructured loans as of September 30, 2024 and December 31, 2023, respectively. We reversed $13,000 and $75,000 of interest income on nonaccrual loans during the three and nine months ended September 30, 2024, respectively, and $13,000 and $78,000 for the three and nine months ended September 30, 2023, respectively. We had $4.5 million and $1.0 million of loans on nonaccrual for which there was no related allowance for credit losses as of September 30, 2024 and December 31, 2023, 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 for which 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, 2024 and December 31, 2023, we had $11.5 million and $7.5 million, respectively, of collateral-dependent loans, secured mainly by real estate and equipment. There have been no significant changes to the collateral that secures the collateral-dependent assets. Foreclosed assets include OREO and repossessed assets. For 1-4 family residential real estate properties, a loan is recognized as a foreclosed property once legal title to the real estate property has been received upon completion of foreclosure or the borrower has conveyed all interest in the residential property through a deed in lieu of foreclosure. There were no loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of September 30, 2024. There were $1.0 million loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of December 31, 2023. Restructured Loans A loan is 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, 2024 were not significant. There was one restructured loan totaling $25,000 with an extension of the amortization period during the nine months ended September 30, 2024. There were three restructured loans totaling $362,000 included in nonperforming assets as of September 30, 2024. During the nine months ended September 30, 2023, there were four restructured loans totaling $358,000 of which $293,000 had an extension of the amortization period and $65,000 had a combination of an extension of the amortization period and an interest rate reduction. On an ongoing basis, performance of restructured loans are monitored for subsequent payment default. Payment default is recognized when the borrower is 90 days or more past due. As of September 30, 2024, there was one restructured loan totaling $289,000 in default. There were no loans in default as of September 30, 2023. Payment defaults for restructured loans did not significantly impact the determination of the allowance for loan losses in the periods presented. At September 30, 2024, 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, 2024 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 4,734 $ 2,704 $ 31,841 $ 2,942 $ 18 $ 168 $ 42,407 Loans charged-off — (133) — (127) — (513) (773) Recoveries of loans charged-off — 47 1 92 — 225 365 Net loans (charged-off) recovered — (86) 1 (35) — (288) (408) Provision for (reversal of) loan losses 421 172 1,917 (507) (3) 277 2,277 Balance at end of period $ 5,155 $ 2,790 $ 33,759 $ 2,400 $ 15 $ 157 $ 44,276 Nine Months Ended September 30, 2024 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 5,287 $ 2,840 $ 32,266 $ 2,086 $ 19 $ 176 $ 42,674 Loans charged-off (1) (24) (261) — (494) — (1,349) (2,128) Recoveries of loans charged-off — 91 4 339 — 722 1,156 Net loans (charged-off) recovered (24) (170) 4 (155) — (627) (972) Provision for (reversal of) loan losses (108) 120 1,489 469 (4) 608 2,574 Balance at end of period $ 5,155 $ 2,790 $ 33,759 $ 2,400 $ 15 $ 157 $ 44,276 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 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, 2024 and December 31, 2023, the accrued interest on our loan portfolio was $21.3 million.

Borrowing Arrangements

Borrowing Arrangements	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Borrowing Arrangements	Borrowing Arrangements Information related to borrowings is provided in the table below (dollars in thousands): September 30, 2024 December 31, 2023 Other borrowings: Balance at end of period $ 105,810 $ 509,820 Average amount outstanding during the period (1) 227,117 436,676 Maximum amount outstanding during the period (2) 597,765 1,030,421 Weighted average interest rate during the period (3) 5.8 % 4.9 % Interest rate at end of period (4) 4.2 % 5.0 % FHLB borrowings: Balance at end of period $ 760,046 $ 212,648 Average amount outstanding during the period (1) 610,893 276,584 Maximum amount outstanding during the period (2) 760,046 533,242 Weighted average interest rate during the period (3) 4.1 % 2.5 % Interest rate at end of period (5) 4.2 % 1.2 % (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, 2024 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 $ 105,810 $ — $ — $ — $ — $ — $ 105,810 FHLB borrowings 758,714 582 401 349 — — 760,046 Total obligations $ 864,524 $ 582 $ 401 $ 349 $ — $ — $ 865,856 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, Amegy Bank and TIB – The Independent Bankers Bank for $40.0 million, $25.0 million and $15.0 million, respectively. There were no federal funds purchased at September 30, 2024 or December 31, 2023. 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, 2024, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities, was approximately $352.6 million. There were $25.0 million in borrowings from the FRDW at September 30, 2024, and $300.0 million at December 31, 2023. 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. On March 11, 2024, the Federal Reserve stopped extending new BTFP advances. There were no remaining borrowings from the BTFP at September 30, 2024 compared to $117.7 million at December 31, 2023. Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit, and at September 30, 2024, the line had one outstanding letter of credit for $155,000. Southside Bank currently has one outstanding letter of credit from FHLB held as collateral for a loan for $6.1 million. Southside Bank enters into sales of securities under repurchase agreements. These repurchase agreements totaled $80.8 million at September 30, 2024 and $92.1 million at December 31, 2023, and had maturities of less than 1.0 year. Repurchase agreements are secured by investment and MBS securities and are stated at the amount of cash received in connection with the transaction.

Long-term Debt

Long-term Debt	9 Months Ended
	Sep. 30, 2024
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, 2024 December 31, 2023 Subordinated notes: (1) 3.875% Subordinated notes, net of unamortized debt issuance costs (2) $ 92,006 $ 93,877 Total Subordinated notes 92,006 93,877 Trust preferred subordinated debentures: (3) Southside Statutory Trust III, net of unamortized debt issuance costs (4) 20,581 20,578 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 60,273 60,270 Total Long-term debt $ 152,279 $ 154,147 (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 $994,000 at September 30, 2024 and $1.1 million at December 31, 2023. (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 $38,000 at September 30, 2024 and $41,000 at December 31, 2023. As of September 30, 2024, 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 September 4, 2003 $ 20,619 Floating 3 month SOFR + 3.20% September 4, 2033 Southside Statutory Trust IV August 8, 2007 $ 23,196 Floating 3 month SOFR + 1.56% October 30, 2037 Southside Statutory Trust V August 10, 2007 $ 12,887 Floating 3 month SOFR + 2.51% September 15, 2037 Magnolia Trust Company I (2) May 20, 2005 $ 3,609 Floating 3 month SOFR + 2.06% November 23, 2035 (1) On April 4, 2024 and June 14, 2023, the Company repurchased $2.0 million and $5.0 million, respectively, of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030. (2) 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, 2024
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 2024 2023 2024 2023 2024 2023 Interest cost $ 905 $ 942 $ 27 $ 31 $ 215 $ 208 Expected return on assets (1,214) (1,143) (46) (47) — — Net loss amortization 144 182 — — 12 7 Net periodic benefit cost (income) $ (165) $ (19) $ (19) $ (16) $ 227 $ 215 Nine Months Ended September 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2024 2023 2024 2023 2024 2023 Interest cost $ 2,715 $ 2,828 $ 79 $ 94 $ 644 $ 623 Expected return on assets (3,643) (3,430) (136) (140) — — Net loss amortization 433 545 — — 38 22 Net periodic benefit cost (income) $ (495) $ (57) $ (57) $ (46) $ 682 $ 645 All cost components disclosed above are recorded in other noninterest expense. The noncash adjustment to the employee benefit plan liabilities, consisting of changes in net loss, was $531,000 and $(567,000) for the nine months ended September 30, 2024 and 2023, 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. Cash Flow Hedges 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 interest expense in the same periods that the hedged cash flows impact earnings. 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 $790.0 million of Bank liabilities. The cash flows from the swap contracts are expected to be highly 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 are probable of not occurring, any related gains or losses recorded in AOCI are immediately recognized in earnings. During the third quarter of 2024, we terminated three interest rate swap contracts designated as a cash flow hedge, and 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 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. Fair Value Hedges Gains and losses on derivative instruments designated as fair value hedges, as well as the change in fair value of 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 offset changes in the fair value of the hedged portion of the hedged item. During 2022, we entered into partial term fair value hedges for certain of our fixed rate callable AFS municipal securities. During 2024, we entered into partial term fair value hedges of fixed rate AFS MBS and fixed rate loans using the portfolio layer method. This approach allows us to designate as the hedged item a stated amount of the assets that are not expected to be affected by prepayments, defaults and other factors affecting the timing and amount of cash flows. The fair value portfolio level hedging adjustment on our hedged MBS portfolio and hedged loan portfolio has not been attributed to the individual AFS securities or individual loans in our balance sheet. 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. 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. During 2024 and 2023, we terminated some of our securities fair value hedging relationships and sold the majority of the hedged items. As a result of the sale, the cumulative adjustments to the carrying amount was a fair value net gain of $3.5 million and $6.5 million recognized in earnings and recorded in noninterest income during the nine months ended September 30, 2024 and year ended December 31, 2023, respectively. The following table presents the amounts recorded in the consolidated balance sheets related to the cumulative adjustments for fair value hedges (in thousands): Amortized Cost of Hedged Assets (2) Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Items September 30, 2024 December 31, 2023 September 30, 2024 December 31, 2023 Securities AFS (1) (3) $ 991,699 $ 487,486 $ 3,581 $ 13,642 Loans (1) (3) 271,383 — (385) — 1) Amounts include the amortized cost basis of closed portfolios used to designate hedging relationships under the portfolio layer method. The hedged item is a layer of the closed portfolio which is expected to be remaining at the end of the hedging relationship. As of September 30, 2024, the amortized cost basis of the closed MBS portfolio used in these hedging relationships was $625.9 million, the amount of the designated hedged items were $201.0 million and the cumulative amount of fair value hedging adjustments associated with these MBS hedging relationships was a loss of $1.2 million. As of September 30, 2024, the amortized cost basis of the closed loan portfolio used in these hedging relationships was $271.4 million, the amount of the designated hedged items were $155.0 million and the cumulative amount of fair value hedging adjustments associated with these loan hedging relationships was a loss of $385,000. 2) Excludes fair value hedging adjustments. 3) Excluded from the table above are the cumulative amount of fair value hedging adjustments for securities AFS and loans for which hedge accounting has been discontinued in the amounts of a loss of $4.6 million and a loss of $4.2 million, respectively, at September 30, 2024. There were no discontinued hedges as of December 31, 2023. Derivatives Designated as Non-Hedging Instruments 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, 2024 and December 31, 2023, net derivative assets included $22.3 million and $46.8 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, 2024 December 31, 2023 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 $ 790,000 $ 12,880 $ 6,054 $ 1,010,000 $ 24,223 $ 6,910 Swaps-Fair Value Hedge-Financial institution counterparties 675,875 5,781 2,748 453,440 13,658 16 Derivatives designated as non-hedging instruments Interest rate contracts: Swaps-Financial institution counterparties 241,446 14,355 649 248,073 18,249 509 Swaps-Customer counterparties 241,446 649 14,355 248,073 509 18,249 Gross derivatives 33,665 23,806 56,639 25,684 Offsetting derivative assets/liabilities (9,451) (9,451) (7,435) (7,435) Cash collateral received/posted (22,300) — (46,760) — Net derivatives included in the consolidated balance sheets (2) $ 1,914 $ 14,355 $ 2,444 $ 18,249 (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. At September 30, 2024, we had $1.3 million credit exposure related to interest rate swaps with financial institutions and $649,000 related to interest rate swaps with customers. At December 31, 2023, we had $1.9 million credit exposure related to interest rate swaps with financial institutions and $509,000 related to interest rate swaps with customers. 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 overnight SOFR rates in effect at September 30, 2024 and December 31, 2023: September 30, 2024 December 31, 2023 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 $ 790,000 1.8 5.21 % 2.62 % $ 1,010,000 2.3 5.44 % 2.65 % Swaps-Fair Value hedge Financial institution counterparties 675,875 3.1 5.16 % 3.47 % 453,440 5.4 5.37 % 3.13 % Swaps-Non-hedging Financial institution counterparties 241,446 6.7 5.48 % 2.86 % 248,073 7.4 5.84 % 2.88 % Customer counterparties 241,446 6.7 2.86 % 5.48 % 248,073 7.4 2.88 % 5.84 % The following table presents amounts included in the consolidated statements of income related to interest rate swap agreements (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Derivatives designated as hedging instruments Swaps-Cash Flow hedge Gain (loss) included in interest expense on deposits $ 3,587 $ 4,254 $ 11,436 $ 10,715 Gain (loss) included in interest expense on FHLB borrowings 2,101 2,200 6,676 5,969 Gain (loss) included in interest expense on other borrowings — (46) — 886 5,688 6,408 18,112 17,570 Swaps-Fair Value hedge Gain (loss) included in interest income on tax-exempt investment securities 2,142 3,651 7,245 9,329 Gain (loss) included in interest income on MBS 488 — 754 — Gain (loss) included in interest income on loans 504 — 591 — Derivatives designated as non-hedging instruments Swaps-Non-hedging Other noninterest income — — 53 160

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2024
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, 2024 and December 31, 2023. 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, 2024 and December 31, 2023, 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, 2024 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 $ 174,167 $ 174,167 $ — $ — State and political subdivisions 436,927 — 436,927 — Corporate bonds and other 14,359 — 14,359 — MBS: (1) Residential 778,093 — 778,093 — Commercial 4,891 — 4,891 — Equity investments: Equity investments 5,421 5,421 — — Derivative assets: Interest rate swaps 33,665 — 33,665 — Total asset recurring fair value measurements $ 1,447,523 $ 179,588 $ 1,267,935 $ — Derivative liabilities: Interest rate swaps $ 23,806 $ — $ 23,806 $ — Total liability recurring fair value measurements $ 23,806 $ — $ 23,806 $ — Nonrecurring fair value measurements Foreclosed assets $ 402 $ — $ — $ 402 Collateral-dependent loans (2) 10,953 — — 10,953 Total asset nonrecurring fair value measurements $ 11,355 $ — $ — $ 11,355 Fair Value Measurements at the End of the Reporting Period Using December 31, 2023 Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Recurring fair value measurements Investment securities: U.S. Treasury $ 139,725 $ 139,725 $ — $ — State and political subdivisions 568,745 — 568,745 — Corporate bonds and other 14,093 — 14,093 — MBS: (1) Residential 568,983 — 568,983 — Commercial 4,748 — 4,748 — Equity investments: Equity investments 5,308 5,308 — — Derivative assets: Interest rate swaps 56,639 — 56,639 — Total asset recurring fair value measurements $ 1,358,241 $ 145,033 $ 1,213,208 $ — Derivative liabilities: Interest rate swaps $ 25,684 $ — $ 25,684 $ — Total liability recurring fair value measurements $ 25,684 $ — $ 25,684 $ — Nonrecurring fair value measurements Foreclosed assets $ 99 $ — $ — $ 99 Collateral-dependent loans (2) 7,000 — — 7,000 Total asset nonrecurring fair value measurements $ 7,099 $ — $ — $ 7,099 (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, 2024 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 486,297 $ 486,297 $ 486,297 $ — $ — Investment securities: HTM, at carrying value 1,172,332 1,060,369 — 1,060,369 — MBS: HTM, at carrying value 116,071 109,154 — 109,154 — FHLB stock, at cost 40,291 40,291 — 40,291 — Equity investments 4,301 4,301 — 4,301 — Loans, net of allowance for loan losses 4,533,772 4,418,820 — — 4,418,820 Loans held for sale 768 768 — 768 — Financial liabilities: Deposits $ 6,435,702 $ 6,436,589 $ — $ 6,436,589 $ — Other borrowings 105,810 105,668 — 105,668 — FHLB borrowings 760,046 755,052 — 755,052 — Subordinated notes, net of unamortized debt issuance costs 92,006 85,253 — 85,253 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,273 51,946 — 51,946 — Estimated Fair Value December 31, 2023 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 560,510 $ 560,510 $ 560,510 $ — $ — Investment securities: HTM, at carrying value 1,186,152 1,054,739 — 1,054,739 — Mortgage-backed securities: HTM, at carrying value 120,901 111,423 — 111,423 — FHLB stock, at cost 11,936 11,936 — 11,936 — Equity investments 4,383 4,383 — 4,383 — Loans, net of allowance for loan losses 4,481,836 4,198,879 — — 4,198,879 Loans held for sale 10,894 10,894 — 10,894 — Financial liabilities: Deposits $ 6,549,681 $ 6,534,929 $ — $ 6,534,929 $ — Other borrowings 509,820 510,242 — 510,242 — FHLB borrowings 212,648 202,750 — 202,750 — Subordinated notes, net of unamortized debt issuance costs 93,877 86,285 — 86,285 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,270 57,480 — 57,480 —

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2024
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 2024 2023 2024 2023 Current income tax expense $ 5,283 $ 4,672 $ 15,102 $ 14,099 Deferred income tax expense (benefit) (893) (1,552) (878) (1,868) Income tax expense $ 4,390 $ 3,120 $ 14,224 $ 12,231 The net deferred tax asset totaled $32.6 million at September 30, 2024, as compared to $30.4 million at December 31, 2023. The increase in the net deferred tax asset is primarily the result of a decrease in the estimated fair value of the effective hedging derivatives. No valuation allowance was recorded at September 30, 2024 or December 31, 2023, 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, 2024 or December 31, 2023.

Off-Balance-Sheet Arrangements,

Off-Balance-Sheet Arrangements, Commitments and Contingencies	9 Months Ended
	Sep. 30, 2024
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 2024 2023 2024 2023 Balance at beginning of period $ 3,208 $ 3,207 $ 3,932 $ 3,687 Provision for (reversal of) off-balance-sheet credit exposures 112 646 (612) 166 Balance at end of period $ 3,320 $ 3,853 $ 3,320 $ 3,853 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, 2024 December 31, 2023 Commitments to extend credit $ 877,223 $ 1,082,327 Standby letters of credit 17,927 10,823 Total $ 895,150 $ 1,093,150 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, 2024 or 2023. During the nine months ended September 30, 2024 and 2023, there were $372,000 and $603,000, respectively, of 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, 2024, there were $19.9 million unsettled trades to purchase securities and no unsettled trades to sell securities. At December 31, 2023, 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, 2024 or December 31, 2023. 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, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net income	$ 20,524	$ 24,673	$ 21,511	$ 18,449	$ 24,893	$ 26,034	$ 66,708	$ 69,376

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2024
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, 2024
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.
Accounting Changes and Reclassifications	Accounting Changes and Reclassifications
Earnings Per Share	Basic earnings per common share is calculated based on the two-class method in accordance with ASC Topic 260, “Earnings Per Share.” ASC 260 provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the calculation of earnings per share pursuant to the two-class method. We have determined that our director’s deferred RSUs are participating securities. Under the two-class method, basic earnings per common share is calculated by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the period, excluding outstanding participating securities. Diluted earnings per common share is calculated using the weighted-average number of shares determined for the basic earnings per common share calculation plus the dilutive effect of stock awards using the treasury stock method.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2024
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 2024 2023 2024 2023 Basic and Diluted Earnings: Net income $ 20,524 $ 18,449 $ 66,708 $ 69,376 Less: Earnings allocated to participating securities 14 10 41 29 Net income available to common shareholders $ 20,510 $ 18,439 $ 66,667 $ 69,347 Basic weighted-average shares outstanding 30,286 30,502 30,276 30,862 Add: Stock awards 84 41 56 54 Diluted weighted-average shares outstanding 30,370 30,543 30,332 30,916 Basic earnings per share: Net income $ 0.68 $ 0.60 $ 2.20 $ 2.25 Diluted earnings per share: Net income $ 0.68 $ 0.60 $ 2.20 $ 2.24

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2024
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, 2024 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (109,881) $ 17,444 $ (18,517) $ (110,954) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications 6,593 (13,658) (1,002) (8,067) Reclassification adjustments included in net income 4,048 (5,688) 156 (1,484) Income tax (expense) benefit (2,235) 4,063 178 2,006 Net current-period other comprehensive income (loss), net of tax 8,406 (15,283) (668) (7,545) Ending balance, net of tax $ (101,475) $ 2,161 $ (19,185) $ (118,499) Nine Months Ended September 30, 2024 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (107,499) $ 12,803 $ (18,766) $ (113,462) Other comprehensive income (loss): Other comprehensive (loss) income before reclassifications (1,094) 4,641 (1,002) 2,545 Reclassification adjustments included in net income 8,720 (18,112) 471 (8,921) Income tax (expense) benefit (1,602) 2,829 112 1,339 Net current-period other comprehensive income (loss), net of tax 6,024 (10,642) (419) (5,037) Ending balance, net of tax $ (101,475) $ 2,161 $ (19,185) $ (118,499) 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 income (loss) 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)
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 2024 2023 2024 2023 Unrealized gains and losses on securities transferred: Amortization of unrealized gains and losses (1) $ (2,119) $ (2,008) $ (6,210) $ (5,989) Tax benefit 445 422 1,304 1,258 Net of tax (1,674) (1,586) (4,906) (4,731) Unrealized gains and losses on available for sale securities: Realized net gain (loss) on sale of securities (2) (1,929) 11 (2,510) (5,590) Tax (expense) benefit 405 (2) 527 1,174 Net of tax (1,524) 9 (1,983) (4,416) Derivatives: Realized net gain (loss) on interest rate swap derivatives (3) 5,688 6,408 18,112 17,570 Tax benefit (1,195) (1,346) (3,804) (3,690) Net of tax 4,493 5,062 14,308 13,880 Amortization of pension plan: Net actuarial loss (4) (156) (189) (471) (567) Tax benefit 33 40 99 119 Net of tax (123) (149) (372) (448) Total reclassifications for the period, net of tax $ 1,172 $ 3,336 $ 7,047 $ 4,285 (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, 2024
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, 2024 and December 31, 2023 are reflected in the tables below (in thousands): September 30, 2024 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 174,076 $ 91 $ — $ 174,167 State and political subdivisions 468,836 135 32,044 436,927 Corporate bonds and other 14,626 147 414 14,359 MBS: (1) Residential 770,310 10,016 2,233 778,093 Commercial 5,249 81 439 4,891 Total $ 1,433,097 $ 10,470 $ 35,130 $ 1,408,437 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,040,876 $ 8,810 $ 110,543 $ 939,143 Corporate bonds and other 131,456 157 10,387 121,226 MBS: (1) Residential 86,321 19 5,493 80,847 Commercial 29,750 — 1,443 28,307 Total $ 1,288,403 $ 8,986 $ 127,866 $ 1,169,523 December 31, 2023 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 139,706 $ 19 $ — $ 139,725 State and political subdivisions 603,913 362 35,530 568,745 Corporate bonds and other 14,569 31 507 14,093 MBS: (1) Residential 569,039 3,202 3,258 568,983 Commercial 5,240 44 536 4,748 Total $ 1,332,467 $ 3,658 $ 39,831 $ 1,296,294 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,039,440 $ 10,070 $ 126,233 $ 923,277 Corporate bonds and other 146,712 488 15,738 131,462 MBS: (1) Residential 90,619 13 7,263 83,369 Commercial 30,282 — 2,228 28,054 Total $ 1,307,053 $ 10,571 $ 151,462 $ 1,166,162 (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, 2024 and December 31, 2023, segregated by major security type and length of time in a continuous loss position (in thousands): September 30, 2024 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 $ — $ — $ 414,965 $ 32,044 $ 414,965 $ 32,044 Corporate bonds and other 2,926 74 6,377 340 9,303 414 MBS: Residential 19,843 63 34,116 2,170 53,959 2,233 Commercial — — 2,552 439 2,552 439 Total $ 22,769 $ 137 $ 458,010 $ 34,993 $ 480,779 $ 35,130 HELD TO MATURITY Investment securities: State and political subdivisions $ 22,229 $ 224 $ 737,971 $ 110,319 $ 760,200 $ 110,543 Corporate bonds and other 6,137 143 107,409 10,244 113,546 10,387 MBS: Residential — — 80,287 5,493 80,287 5,493 Commercial — — 28,307 1,443 28,307 1,443 Total $ 28,366 $ 367 $ 953,974 $ 127,499 $ 982,340 $ 127,866 December 31, 2023 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 $ 26,371 $ 297 $ 516,520 $ 35,233 $ 542,891 $ 35,530 Corporate bonds and other 8,103 319 5,071 188 13,174 507 MBS: Residential 150,865 549 36,864 2,709 187,729 3,258 Commercial — — 2,484 536 2,484 536 Total $ 185,339 $ 1,165 $ 560,939 $ 38,666 $ 746,278 $ 39,831 HELD TO MATURITY Investment securities: State and political subdivisions $ 16,549 $ 123 $ 713,499 $ 126,110 $ 730,048 $ 126,233 Corporate bonds and other 9,956 1,135 114,787 14,603 124,743 15,738 MBS: Residential — — 82,747 7,263 82,747 7,263 Commercial — — 28,054 2,228 28,054 2,228 Total $ 26,505 $ 1,258 $ 939,087 $ 150,204 $ 965,592 $ 151,462
Interest income recognized on securities	The following table reflects interest income recognized on securities for the periods presented (in thousands): Three Months Ended 2024 2023 U.S. Treasury $ 2,315 $ 3,784 State and political subdivisions 12,994 16,940 Corporate bonds and other 1,654 1,765 MBS 11,976 4,426 Total interest income on securities $ 28,939 $ 26,915 Nine Months Ended 2024 2023 U.S. Treasury $ 6,404 $ 8,307 State and political subdivisions 41,151 50,940 Corporate bonds and other 5,182 5,363 MBS 33,179 12,585 Total interest income on securities $ 85,916 $ 77,195
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, 2024, are presented below by contractual maturity (in thousands): September 30, 2024 Amortized Cost Fair Value AVAILABLE FOR SALE Investment securities: Due in one year or less $ 176,356 $ 176,436 Due after one year through five years 1,797 1,810 Due after five years through ten years 25,600 25,193 Due after ten years 453,785 422,014 657,538 625,453 MBS: 775,559 782,984 Total $ 1,433,097 $ 1,408,437 September 30, 2024 Amortized Cost Fair Value HELD TO MATURITY Investment securities: Due in one year or less $ 4,118 $ 4,087 Due after one year through five years 11,920 11,695 Due after five years through ten years 141,206 131,105 Due after ten years 1,015,088 913,482 1,172,332 1,060,369 MBS: 116,071 109,154 Total $ 1,288,403 $ 1,169,523
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 2024 2023 2024 2023 Net gains (losses) recognized during the period on equity investments $ 191 $ (163) $ 112 $ 4,895 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 $ 191 $ (163) $ 112 $ (163)

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Loans by Portfolio Segment	Loans in the accompanying consolidated balance sheets are classified as follows (in thousands): September 30, 2024 December 31, 2023 Real estate loans: Construction $ 585,817 $ 789,744 1-4 family residential 755,406 696,738 Commercial 2,422,612 2,168,451 Commercial loans 358,854 366,893 Municipal loans 402,041 441,168 Loans to individuals 53,318 61,516 Total loans 4,578,048 4,524,510 Less: Allowance for loan losses 44,276 42,674 Net loans $ 4,533,772 $ 4,481,836
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, 2024 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Amortized Cost Basis Total 2024 2023 2022 2021 2020 Prior Construction real estate: Pass $ 71,994 $ 125,687 $ 99,870 $ 17,993 $ 4,052 $ 7,019 $ 161,656 $ 488,271 Pass watch 220 — 71,129 — 441 — 1,232 73,022 Special mention — — — 610 — 74 — 684 Substandard — 114 23,653 61 — — — 23,828 Doubtful — — — — — 12 — 12 Total construction real estate $ 72,214 $ 125,801 $ 194,652 $ 18,664 $ 4,493 $ 7,105 $ 162,888 $ 585,817 Current period gross charge-offs $ — $ 24 $ — $ — $ — $ — $ — $ 24 1-4 family residential real estate: Pass $ 39,810 $ 64,391 $ 157,973 $ 144,490 $ 108,906 $ 233,187 $ 1,598 $ 750,355 Pass watch — — — — — — — — Special mention — — — 508 — — — 508 Substandard 50 225 — 231 1,167 2,662 — 4,335 Doubtful — — — — — 208 — 208 Total 1-4 family residential real estate $ 39,860 $ 64,616 $ 157,973 $ 145,229 $ 110,073 $ 236,057 $ 1,598 $ 755,406 Current period gross charge-offs $ — $ 31 $ — $ — $ 10 $ 220 $ — $ 261 Commercial real estate: Pass $ 167,260 $ 469,960 $ 658,916 $ 571,720 $ 168,752 $ 250,200 $ 4,967 $ 2,291,775 Pass watch — 15,094 54,106 — 2,430 11,194 — 82,824 Special mention 4,005 — 19,436 563 — 13,393 — 37,397 Substandard — 3,722 835 87 255 5,597 — 10,496 Doubtful — — — — — 120 — 120 Total commercial real estate $ 171,265 $ 488,776 $ 733,293 $ 572,370 $ 171,437 $ 280,504 $ 4,967 $ 2,422,612 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial loans: Pass $ 65,558 $ 66,550 $ 58,740 $ 15,720 $ 6,927 $ 3,541 $ 126,939 $ 343,975 Pass watch — 32 697 985 74 588 4,375 6,751 Special mention 409 2,018 171 263 — 117 2,289 5,267 Substandard 61 283 1,042 32 — 16 1,027 2,461 Doubtful 99 64 120 69 — 48 — 400 Total commercial loans $ 66,127 $ 68,947 $ 60,770 $ 17,069 $ 7,001 $ 4,310 $ 134,630 $ 358,854 Current period gross charge-offs $ 23 $ 310 $ 83 $ 67 $ — $ 11 $ — $ 494 Municipal loans: Pass $ 1,949 $ 35,057 $ 59,447 $ 65,666 $ 43,395 $ 196,527 $ — $ 402,041 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 1,949 $ 35,057 $ 59,447 $ 65,666 $ 43,395 $ 196,527 $ — $ 402,041 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 16,564 $ 13,034 $ 9,161 $ 7,095 $ 3,502 $ 1,256 $ 2,607 $ 53,219 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard 11 2 53 — — 11 — 77 Doubtful — 4 15 3 — — — 22 Total loans to individuals $ 16,575 $ 13,040 $ 9,229 $ 7,098 $ 3,502 $ 1,267 $ 2,607 $ 53,318 Current period gross charge-offs (1) $ 1,212 $ 33 $ 37 $ 2 $ 33 $ 32 $ — $ 1,349 Total loans $ 367,990 $ 796,237 $ 1,215,364 $ 826,096 $ 339,901 $ 725,770 $ 306,690 $ 4,578,048 Total current period gross charge-offs (1) $ 1,235 $ 398 $ 120 $ 69 $ 43 $ 263 $ — $ 2,128 (1) Includes $900,000 in charged off demand deposit overdrafts reported as 2024 originations. December 31, 2023 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Amortized Cost Basis Total 2023 2022 2021 2020 2019 Prior Construction real estate: Pass $ 132,838 $ 236,573 $ 196,311 $ 37,997 $ 3,938 $ 6,457 $ 144,358 $ 758,472 Pass watch — 7,798 — — — — — 7,798 Special mention 13,166 9,456 698 — 7 — — 23,327 Substandard 36 — 68 — — 43 — 147 Doubtful — — — — — — — — Total construction real estate $ 146,040 $ 253,827 $ 197,077 $ 37,997 $ 3,945 $ 6,500 $ 144,358 $ 789,744 Current period gross charge-offs $ — $ 92 $ — $ — $ — $ — $ — $ 92 1-4 family residential real estate: Pass $ 41,520 $ 126,981 $ 145,671 $ 114,631 $ 63,710 $ 196,651 $ 1,803 $ 690,967 Pass watch — — — 32 — — — 32 Special mention — — — 75 — — — 75 Substandard 325 — 73 1,379 — 3,259 74 5,110 Doubtful — — — 163 — 391 — 554 Total 1-4 family residential real estate $ 41,845 $ 126,981 $ 145,744 $ 116,280 $ 63,710 $ 200,301 $ 1,877 $ 696,738 Current period gross charge-offs $ — $ — $ — $ — $ 1 $ 118 $ — $ 119 Commercial real estate: Pass $ 469,844 $ 641,577 $ 495,363 $ 143,150 $ 91,085 $ 189,021 $ 16,493 $ 2,046,533 Pass watch 24,300 34,424 255 1,037 333 146 — 60,495 Special mention 17,403 — — — 9,746 25,072 — 52,221 Substandard — 862 95 269 1,565 6,346 — 9,137 Doubtful — — — — 65 — — 65 Total commercial real estate $ 511,547 $ 676,863 $ 495,713 $ 144,456 $ 102,794 $ 220,585 $ 16,493 $ 2,168,451 Current period gross charge-offs $ — $ — $ — $ — $ 788 $ — $ — $ 788 Commercial loans: Pass $ 78,090 $ 62,192 $ 42,114 $ 10,708 $ 4,356 $ 3,310 $ 161,153 $ 361,923 Pass watch — 128 117 — — 18 — 263 Special mention 191 174 — 16 — 162 — 543 Substandard 14 2,357 73 — 65 12 821 3,342 Doubtful 238 267 133 — 64 120 — 822 Total commercial loans $ 78,533 $ 65,118 $ 42,437 $ 10,724 $ 4,485 $ 3,622 $ 161,974 $ 366,893 Current period gross charge-offs $ 745 $ 440 $ 44 $ 26 $ 23 $ 5 $ — $ 1,283 Municipal loans: Pass $ 39,028 $ 61,429 $ 68,979 $ 49,746 $ 39,949 $ 182,037 $ — $ 441,168 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 39,028 $ 61,429 $ 68,979 $ 49,746 $ 39,949 $ 182,037 $ — $ 441,168 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 22,788 $ 15,503 $ 11,588 $ 6,256 $ 2,180 $ 941 $ 2,216 $ 61,472 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — 13 — — 13 Doubtful 4 17 — 10 — — — 31 Total loans to individuals $ 22,792 $ 15,520 $ 11,588 $ 6,266 $ 2,193 $ 941 $ 2,216 $ 61,516 Current period gross charge-offs $ 1,682 $ 54 $ 61 $ 20 $ 6 $ 99 $ — $ 1,922 Total loans $ 839,785 $ 1,199,738 $ 961,538 $ 365,469 $ 217,076 $ 613,986 $ 326,918 $ 4,524,510 Total current period gross charge-offs (1) $ 2,427 $ 586 $ 105 $ 46 $ 818 $ 222 $ — $ 4,204 (1) Includes $1.7 million in charged off demand deposit overdrafts reported as 2023 originations.
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, 2024 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 $ 320 $ — $ — $ 320 $ 585,497 $ 585,817 1-4 family residential 439 471 55 965 754,441 755,406 Commercial 194 3,837 30 4,061 2,418,551 2,422,612 Commercial loans 879 1,150 642 2,671 356,183 358,854 Municipal loans — — — — 402,041 402,041 Loans to individuals 68 15 — 83 53,235 53,318 Total $ 1,900 $ 5,473 $ 727 $ 8,100 $ 4,569,948 $ 4,578,048 December 31, 2023 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days Total Past Due Current Total Real estate loans: Construction $ 474 $ — $ 29 $ 503 $ 789,241 $ 789,744 1-4 family residential 4,638 774 1,700 7,112 689,626 696,738 Commercial 621 34 40 695 2,167,756 2,168,451 Commercial loans 1,693 347 127 2,167 364,726 366,893 Municipal loans 27 — — 27 441,141 441,168 Loans to individuals 107 1 10 118 61,398 61,516 Total $ 7,560 $ 1,156 $ 1,906 $ 10,622 $ 4,513,888 $ 4,524,510
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, 2024 December 31, 2023 Nonaccrual loans: Real estate loans: Construction $ 150 $ 29 1-4 family residential 1,346 2,093 Commercial 3,929 528 Commercial loans 1,796 1,208 Loans to individuals 33 31 Total nonaccrual loans (1) 7,254 3,889 Accruing loans past due more than 90 days — — Restructured loans — 13 OREO 388 99 Repossessed assets 14 — Total nonperforming assets $ 7,656 $ 4,001 (1) Includes $362,000 and $506,000 of restructured loans as of September 30, 2024 and December 31, 2023, respectively.
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, 2024 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 4,734 $ 2,704 $ 31,841 $ 2,942 $ 18 $ 168 $ 42,407 Loans charged-off — (133) — (127) — (513) (773) Recoveries of loans charged-off — 47 1 92 — 225 365 Net loans (charged-off) recovered — (86) 1 (35) — (288) (408) Provision for (reversal of) loan losses 421 172 1,917 (507) (3) 277 2,277 Balance at end of period $ 5,155 $ 2,790 $ 33,759 $ 2,400 $ 15 $ 157 $ 44,276 Nine Months Ended September 30, 2024 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 5,287 $ 2,840 $ 32,266 $ 2,086 $ 19 $ 176 $ 42,674 Loans charged-off (1) (24) (261) — (494) — (1,349) (2,128) Recoveries of loans charged-off — 91 4 339 — 722 1,156 Net loans (charged-off) recovered (24) (170) 4 (155) — (627) (972) Provision for (reversal of) loan losses (108) 120 1,489 469 (4) 608 2,574 Balance at end of period $ 5,155 $ 2,790 $ 33,759 $ 2,400 $ 15 $ 157 $ 44,276 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

Borrowing Arrangements (Tables)

Borrowing Arrangements (Tables)	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Debt	Information related to borrowings is provided in the table below (dollars in thousands): September 30, 2024 December 31, 2023 Other borrowings: Balance at end of period $ 105,810 $ 509,820 Average amount outstanding during the period (1) 227,117 436,676 Maximum amount outstanding during the period (2) 597,765 1,030,421 Weighted average interest rate during the period (3) 5.8 % 4.9 % Interest rate at end of period (4) 4.2 % 5.0 % FHLB borrowings: Balance at end of period $ 760,046 $ 212,648 Average amount outstanding during the period (1) 610,893 276,584 Maximum amount outstanding during the period (2) 760,046 533,242 Weighted average interest rate during the period (3) 4.1 % 2.5 % Interest rate at end of period (5) 4.2 % 1.2 % (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, 2024 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 $ 105,810 $ — $ — $ — $ — $ — $ 105,810 FHLB borrowings 758,714 582 401 349 — — 760,046 Total obligations $ 864,524 $ 582 $ 401 $ 349 $ — $ — $ 865,856

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2024
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, 2024 December 31, 2023 Subordinated notes: (1) 3.875% Subordinated notes, net of unamortized debt issuance costs (2) $ 92,006 $ 93,877 Total Subordinated notes 92,006 93,877 Trust preferred subordinated debentures: (3) Southside Statutory Trust III, net of unamortized debt issuance costs (4) 20,581 20,578 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 60,273 60,270 Total Long-term debt $ 152,279 $ 154,147 (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 $994,000 at September 30, 2024 and $1.1 million at December 31, 2023. (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)
Schedule of Subordinated Borrowing	As of September 30, 2024, 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 September 4, 2003 $ 20,619 Floating 3 month SOFR + 3.20% September 4, 2033 Southside Statutory Trust IV August 8, 2007 $ 23,196 Floating 3 month SOFR + 1.56% October 30, 2037 Southside Statutory Trust V August 10, 2007 $ 12,887 Floating 3 month SOFR + 2.51% September 15, 2037 Magnolia Trust Company I (2) May 20, 2005 $ 3,609 Floating 3 month SOFR + 2.06% November 23, 2035 (1) On April 4, 2024 and June 14, 2023, the Company repurchased $2.0 million and $5.0 million, respectively, of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030. (2) 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, 2024
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 2024 2023 2024 2023 2024 2023 Interest cost $ 905 $ 942 $ 27 $ 31 $ 215 $ 208 Expected return on assets (1,214) (1,143) (46) (47) — — Net loss amortization 144 182 — — 12 7 Net periodic benefit cost (income) $ (165) $ (19) $ (19) $ (16) $ 227 $ 215 Nine Months Ended September 30, Retirement Plan Acquired Retirement Plan Restoration Plan 2024 2023 2024 2023 2024 2023 Interest cost $ 2,715 $ 2,828 $ 79 $ 94 $ 644 $ 623 Expected return on assets (3,643) (3,430) (136) (140) — — Net loss amortization 433 545 — — 38 22 Net periodic benefit cost (income) $ (495) $ (57) $ (57) $ (46) $ 682 $ 645

Derivative Financial Instrume_2

Derivative Financial Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location	The following table presents the amounts recorded in the consolidated balance sheets related to the cumulative adjustments for fair value hedges (in thousands): Amortized Cost of Hedged Assets (2) Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Items September 30, 2024 December 31, 2023 September 30, 2024 December 31, 2023 Securities AFS (1) (3) $ 991,699 $ 487,486 $ 3,581 $ 13,642 Loans (1) (3) 271,383 — (385) — 1) Amounts include the amortized cost basis of closed portfolios used to designate hedging relationships under the portfolio layer method. The hedged item is a layer of the closed portfolio which is expected to be remaining at the end of the hedging relationship. As of September 30, 2024, the amortized cost basis of the closed MBS portfolio used in these hedging relationships was $625.9 million, the amount of the designated hedged items were $201.0 million and the cumulative amount of fair value hedging adjustments associated with these MBS hedging relationships was a loss of $1.2 million. As of September 30, 2024, the amortized cost basis of the closed loan portfolio used in these hedging relationships was $271.4 million, the amount of the designated hedged items were $155.0 million and the cumulative amount of fair value hedging adjustments associated with these loan hedging relationships was a loss of $385,000. 2) Excludes fair value hedging adjustments. 3) Excluded from the table above are the cumulative amount of fair value hedging adjustments for securities AFS and loans for which hedge accounting has been discontinued in the amounts of a loss of $4.6 million and a loss of $4.2 million, respectively, at September 30, 2024. There were no discontinued hedges as of December 31, 2023.
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, 2024 December 31, 2023 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 $ 790,000 $ 12,880 $ 6,054 $ 1,010,000 $ 24,223 $ 6,910 Swaps-Fair Value Hedge-Financial institution counterparties 675,875 5,781 2,748 453,440 13,658 16 Derivatives designated as non-hedging instruments Interest rate contracts: Swaps-Financial institution counterparties 241,446 14,355 649 248,073 18,249 509 Swaps-Customer counterparties 241,446 649 14,355 248,073 509 18,249 Gross derivatives 33,665 23,806 56,639 25,684 Offsetting derivative assets/liabilities (9,451) (9,451) (7,435) (7,435) Cash collateral received/posted (22,300) — (46,760) — Net derivatives included in the consolidated balance sheets (2) $ 1,914 $ 14,355 $ 2,444 $ 18,249 (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 overnight SOFR rates in effect at September 30, 2024 and December 31, 2023: September 30, 2024 December 31, 2023 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 $ 790,000 1.8 5.21 % 2.62 % $ 1,010,000 2.3 5.44 % 2.65 % Swaps-Fair Value hedge Financial institution counterparties 675,875 3.1 5.16 % 3.47 % 453,440 5.4 5.37 % 3.13 % Swaps-Non-hedging Financial institution counterparties 241,446 6.7 5.48 % 2.86 % 248,073 7.4 5.84 % 2.88 % Customer counterparties 241,446 6.7 2.86 % 5.48 % 248,073 7.4 2.88 % 5.84 %
Derivative Instruments, Gain (Loss)	The following table presents amounts included in the consolidated statements of income related to interest rate swap agreements (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Derivatives designated as hedging instruments Swaps-Cash Flow hedge Gain (loss) included in interest expense on deposits $ 3,587 $ 4,254 $ 11,436 $ 10,715 Gain (loss) included in interest expense on FHLB borrowings 2,101 2,200 6,676 5,969 Gain (loss) included in interest expense on other borrowings — (46) — 886 5,688 6,408 18,112 17,570 Swaps-Fair Value hedge Gain (loss) included in interest income on tax-exempt investment securities 2,142 3,651 7,245 9,329 Gain (loss) included in interest income on MBS 488 — 754 — Gain (loss) included in interest income on loans 504 — 591 — Derivatives designated as non-hedging instruments Swaps-Non-hedging Other noninterest income — — 53 160

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2024
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, 2024 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 $ 174,167 $ 174,167 $ — $ — State and political subdivisions 436,927 — 436,927 — Corporate bonds and other 14,359 — 14,359 — MBS: (1) Residential 778,093 — 778,093 — Commercial 4,891 — 4,891 — Equity investments: Equity investments 5,421 5,421 — — Derivative assets: Interest rate swaps 33,665 — 33,665 — Total asset recurring fair value measurements $ 1,447,523 $ 179,588 $ 1,267,935 $ — Derivative liabilities: Interest rate swaps $ 23,806 $ — $ 23,806 $ — Total liability recurring fair value measurements $ 23,806 $ — $ 23,806 $ — Nonrecurring fair value measurements Foreclosed assets $ 402 $ — $ — $ 402 Collateral-dependent loans (2) 10,953 — — 10,953 Total asset nonrecurring fair value measurements $ 11,355 $ — $ — $ 11,355 Fair Value Measurements at the End of the Reporting Period Using December 31, 2023 Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Recurring fair value measurements Investment securities: U.S. Treasury $ 139,725 $ 139,725 $ — $ — State and political subdivisions 568,745 — 568,745 — Corporate bonds and other 14,093 — 14,093 — MBS: (1) Residential 568,983 — 568,983 — Commercial 4,748 — 4,748 — Equity investments: Equity investments 5,308 5,308 — — Derivative assets: Interest rate swaps 56,639 — 56,639 — Total asset recurring fair value measurements $ 1,358,241 $ 145,033 $ 1,213,208 $ — Derivative liabilities: Interest rate swaps $ 25,684 $ — $ 25,684 $ — Total liability recurring fair value measurements $ 25,684 $ — $ 25,684 $ — Nonrecurring fair value measurements Foreclosed assets $ 99 $ — $ — $ 99 Collateral-dependent loans (2) 7,000 — — 7,000 Total asset nonrecurring fair value measurements $ 7,099 $ — $ — $ 7,099 (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, 2024 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 486,297 $ 486,297 $ 486,297 $ — $ — Investment securities: HTM, at carrying value 1,172,332 1,060,369 — 1,060,369 — MBS: HTM, at carrying value 116,071 109,154 — 109,154 — FHLB stock, at cost 40,291 40,291 — 40,291 — Equity investments 4,301 4,301 — 4,301 — Loans, net of allowance for loan losses 4,533,772 4,418,820 — — 4,418,820 Loans held for sale 768 768 — 768 — Financial liabilities: Deposits $ 6,435,702 $ 6,436,589 $ — $ 6,436,589 $ — Other borrowings 105,810 105,668 — 105,668 — FHLB borrowings 760,046 755,052 — 755,052 — Subordinated notes, net of unamortized debt issuance costs 92,006 85,253 — 85,253 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,273 51,946 — 51,946 — Estimated Fair Value December 31, 2023 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 560,510 $ 560,510 $ 560,510 $ — $ — Investment securities: HTM, at carrying value 1,186,152 1,054,739 — 1,054,739 — Mortgage-backed securities: HTM, at carrying value 120,901 111,423 — 111,423 — FHLB stock, at cost 11,936 11,936 — 11,936 — Equity investments 4,383 4,383 — 4,383 — Loans, net of allowance for loan losses 4,481,836 4,198,879 — — 4,198,879 Loans held for sale 10,894 10,894 — 10,894 — Financial liabilities: Deposits $ 6,549,681 $ 6,534,929 $ — $ 6,534,929 $ — Other borrowings 509,820 510,242 — 510,242 — FHLB borrowings 212,648 202,750 — 202,750 — Subordinated notes, net of unamortized debt issuance costs 93,877 86,285 — 86,285 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,270 57,480 — 57,480 —

Income Taxes Income Taxes (Tabl

Income Taxes Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2024
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 2024 2023 2024 2023 Current income tax expense $ 5,283 $ 4,672 $ 15,102 $ 14,099 Deferred income tax expense (benefit) (893) (1,552) (878) (1,868) Income tax expense $ 4,390 $ 3,120 $ 14,224 $ 12,231

Off-Balance-Sheet Arrangement_2

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2024
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 2024 2023 2024 2023 Balance at beginning of period $ 3,208 $ 3,207 $ 3,932 $ 3,687 Provision for (reversal of) off-balance-sheet credit exposures 112 646 (612) 166 Balance at end of period $ 3,320 $ 3,853 $ 3,320 $ 3,853
Schedule of unused commitments	Financial instruments with off-balance-sheet risk were as follows (in thousands): September 30, 2024 December 31, 2023 Commitments to extend credit $ 877,223 $ 1,082,327 Standby letters of credit 17,927 10,823 Total $ 895,150 $ 1,093,150

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, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Basic and Diluted Earnings:
Net income	$ 20,524	$ 24,673	$ 21,511	$ 18,449	$ 24,893	$ 26,034	$ 66,708	$ 69,376
Earnings allocated to participating securities, basic	14			10			41	29
Net income available to common stockholders, basic	$ 20,510			$ 18,439			$ 66,667	$ 69,347
Basic weighted-average shares outstanding (in shares)	30,286			30,502			30,276	30,862
Add: Stock awards (in shares)	84			41			56	54
Diluted weighted-average shares outstanding (in shares)	30,370			30,543			30,332	30,916
Basic earnings per share:
Earnings per common share - basic (in dollars per share)	$ 0.68			$ 0.60			$ 2.20	$ 2.25
Diluted earnings per share:
Earnings per common share - diluted (in dollars per share)	$ 0.68			$ 0.60			$ 2.20	$ 2.24
Number of antidilutive shares (in shares)	539			611			534	571

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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	$ 800,970	$ 765,161	$ 773,288	$ 745,997
Income tax (expense) benefit	2,006	10,443	1,339	4,658
Ending balance, net of tax	805,254	728,595	805,254	728,595
Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(109,881)	(125,929)	(107,499)	(149,181)
Other comprehensive (loss) income before reclassifications	6,593	(52,882)	(1,094)	(33,032)
Reclassification adjustments included in net income	4,048	1,997	8,720	11,579
Income tax (expense) benefit	(2,235)	10,686	(1,602)	4,506
Net current-period other comprehensive income (loss), net of tax	8,406	(40,199)	6,024	(16,947)
Ending balance, net of tax	(101,475)	(166,128)	(101,475)	(166,128)
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	17,444	29,439	12,803	31,227
Other comprehensive (loss) income before reclassifications	(13,658)	7,377	4,641	16,277
Reclassification adjustments included in net income	(5,688)	(6,408)	(18,112)	(17,570)
Income tax (expense) benefit	4,063	(203)	2,829	271
Net current-period other comprehensive income (loss), net of tax	(15,283)	766	(10,642)	(1,022)
Ending balance, net of tax	2,161	30,205	2,161	30,205
Retirement Plans
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(18,517)	(19,203)	(18,766)	(19,502)
Other comprehensive (loss) income before reclassifications	(1,002)	0	(1,002)	0
Reclassification adjustments included in net income	156	189	471	567
Income tax (expense) benefit	178	(40)	112	(119)
Net current-period other comprehensive income (loss), net of tax	(668)	149	(419)	448
Ending balance, net of tax	(19,185)	(19,054)	(19,185)	(19,054)
Total
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(110,954)	(115,693)	(113,462)	(137,456)
Other comprehensive (loss) income before reclassifications	(8,067)	(45,505)	2,545	(16,755)
Reclassification adjustments included in net income	(1,484)	(4,222)	(8,921)	(5,424)
Income tax (expense) benefit	2,006	10,443	1,339	4,658
Net current-period other comprehensive income (loss), net of tax	(7,545)	(39,284)	(5,037)	(17,521)
Ending balance, net of tax	$ (118,499)	$ (154,977)	$ (118,499)	$ (154,977)

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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized gains and losses		$ 2,119	$ 2,008	$ 6,210	$ 5,989
Tax benefit (expense)		(4,390)	(3,120)	(14,224)	(12,231)
Realized net gain (loss) on sale of securities		(1,929)	11	(2,510)	(5,590)
Total reclassifications for the period, net of tax		1,172	3,336	7,047	4,285
Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(4,048)	(1,997)	(8,720)	(11,579)
Realized net gain (loss) on interest rate swap derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		5,688	6,408	18,112	17,570
Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[1]	(156)	(189)	(471)	(567)
Amortization of pension plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(156)	(189)	(471)	(567)
Tax benefit		33	40	99	119
Total reclassifications for the period, net of tax		(123)	(149)	(372)	(448)
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]	(2,119)	(2,008)	(6,210)	(5,989)
Tax benefit (expense)		445	422	1,304	1,258
Net of tax		(1,674)	(1,586)	(4,906)	(4,731)
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)		405	(2)	527	1,174
Net of tax		(1,524)	9	(1,983)	(4,416)
Realized net gain (loss) on sale of securities	[3]	(1,929)	11	(2,510)	(5,590)
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)		(1,195)	(1,346)	(3,804)	(3,690)
Net of tax		4,493	5,062	14,308	13,880
Realized net (loss) gain on interest rate swap derivatives	[4]	$ 5,688	$ 6,408	$ 18,112	$ 17,570
[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, 2024	Dec. 31, 2023
Available-for-sale [Abstract]
Amortized Cost		$ 1,433,097	$ 1,332,467
Gross unrealized gains		10,470	3,658
Gross unrealized losses		35,130	39,831
Securities AFS, at estimated fair value		1,408,437	1,296,294
HELD TO MATURITY
Amortized cost		1,288,403	1,307,053
Gross unrealized gains		8,986	10,571
Gross unrealized losses		127,866	151,462
Estimated Fair Value		1,169,523	1,166,162
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		174,076	139,706
Gross unrealized gains		91	19
Gross unrealized losses		0	0
Securities AFS, at estimated fair value		174,167	139,725
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		468,836	603,913
Gross unrealized gains		135	362
Gross unrealized losses		32,044	35,530
Securities AFS, at estimated fair value		436,927	568,745
HELD TO MATURITY
Amortized cost		1,040,876	1,039,440
Gross unrealized gains		8,810	10,070
Gross unrealized losses		110,543	126,233
Estimated Fair Value		939,143	923,277
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,626	14,569
Gross unrealized gains		147	31
Gross unrealized losses		414	507
Securities AFS, at estimated fair value		14,359	14,093
HELD TO MATURITY
Amortized cost		131,456	146,712
Gross unrealized gains		157	488
Gross unrealized losses		10,387	15,738
Estimated Fair Value		121,226	131,462
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	770,310	569,039
Gross unrealized gains	[1]	10,016	3,202
Gross unrealized losses	[1]	2,233	3,258
Securities AFS, at estimated fair value	[1]	778,093	568,983
HELD TO MATURITY
Amortized cost	[1]	86,321	90,619
Gross unrealized gains	[1]	19	13
Gross unrealized losses	[1]	5,493	7,263
Estimated Fair Value	[1]	80,847	83,369
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	5,249	5,240
Gross unrealized gains	[1]	81	44
Gross unrealized losses	[1]	439	536
Securities AFS, at estimated fair value	[1]	4,891	4,748
HELD TO MATURITY
Amortized cost	[1]	29,750	30,282
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	1,443	2,228
Estimated Fair Value	[1]	$ 28,307	$ 28,054
[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, 2024	Dec. 31, 2023
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 22,769	$ 185,339
Less than 12 Months, unrealized loss	137	1,165
More than 12 Months, fair value	458,010	560,939
More than 12 Months, unrealized Loss	34,993	38,666
Total fair value	480,779	746,278
Total unrealized loss	35,130	39,831
HELD TO MATURITY
Less than 12 months, fair value	28,366	26,505
Less than 12 months, unrealized loss	367	1,258
More than 12 months, fair value	953,974	939,087
More than 12 months, unrealized loss	127,499	150,204
Total fair value	982,340	965,592
Total unrealized loss	127,866	151,462
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	0	26,371
Less than 12 Months, unrealized loss	0	297
More than 12 Months, fair value	414,965	516,520
More than 12 Months, unrealized Loss	32,044	35,233
Total fair value	414,965	542,891
Total unrealized loss	32,044	35,530
HELD TO MATURITY
Less than 12 months, fair value	22,229	16,549
Less than 12 months, unrealized loss	224	123
More than 12 months, fair value	737,971	713,499
More than 12 months, unrealized loss	110,319	126,110
Total fair value	760,200	730,048
Total unrealized loss	110,543	126,233
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	2,926	8,103
Less than 12 Months, unrealized loss	74	319
More than 12 Months, fair value	6,377	5,071
More than 12 Months, unrealized Loss	340	188
Total fair value	9,303	13,174
Total unrealized loss	414	507
HELD TO MATURITY
Less than 12 months, fair value	6,137	9,956
Less than 12 months, unrealized loss	143	1,135
More than 12 months, fair value	107,409	114,787
More than 12 months, unrealized loss	10,244	14,603
Total fair value	113,546	124,743
Total unrealized loss	10,387	15,738
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	19,843	150,865
Less than 12 Months, unrealized loss	63	549
More than 12 Months, fair value	34,116	36,864
More than 12 Months, unrealized Loss	2,170	2,709
Total fair value	53,959	187,729
Total unrealized loss	2,233	3,258
HELD TO MATURITY
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
More than 12 months, fair value	80,287	82,747
More than 12 months, unrealized loss	5,493	7,263
Total fair value	80,287	82,747
Total unrealized loss	5,493	7,263
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value	0	0
Less than 12 Months, unrealized loss	0	0
More than 12 Months, fair value	2,552	2,484
More than 12 Months, unrealized Loss	439	536
Total fair value	2,552	2,484
Total unrealized loss	439	536
HELD TO MATURITY
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
More than 12 months, fair value	28,307	28,054
More than 12 months, unrealized loss	1,443	2,228
Total fair value	28,307	28,054
Total unrealized loss	$ 1,443	$ 2,228

Securities - Interest Income on

Securities - Interest Income on Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments, Debt Securities [Abstract]
US Treasury	$ 2,315	$ 3,784	$ 6,404	$ 8,307
State and political subdivisions	12,994	16,940	41,151	50,940
Corporate bonds and other	1,654	1,765	5,182	5,363
MBS	11,976	4,426	33,179	12,585
Total interest income on securities	$ 28,939	$ 26,915	$ 85,916	$ 77,195

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, 2024	Dec. 31, 2023
Available for sale, Amortized Cost
Due in one year or less	$ 176,356
Due after one year through five years	1,797
Due after five years through ten years	25,600
Due after ten years	453,785
Total available-for-sale investment securities	657,538
MBS:	775,559
Amortized Cost	1,433,097	$ 1,332,467
Available for sale, Fair Value
Due in one year or less	176,436
Due after one year through five years	1,810
Due after five years through ten years	25,193
Due after ten years	422,014
Total available-for-sale investment securities	625,453
MBS:	782,984
Total	1,408,437	1,296,294
Held to maturity, Amortized Cost
Due in one year or less	4,118
Due after one year through five years	11,920
Due after five years through ten years	141,206
Due after ten years	1,015,088
Total held-to-maturity investment securities	1,172,332
Mortgage-backed securities	116,071
Amortized cost	1,288,403	1,307,053
Held to maturity, Fair Value
Due in one year or less	4,087
Due after one year through five years	11,695
Due after five years through ten years	131,105
Due after ten years	913,482
Total held-to-maturity investment securities	1,060,369
Mortgage-backed securities	109,154
Total	$ 1,169,523	$ 1,166,162

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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments, All Other Investments [Abstract]
Net gains (losses) recognized during the period on equity investments	$ 191	$ (163)	$ 112	$ 4,895
Less: Net gains recognized during the period on equity investments sold during the period	0	0	0	5,058
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date	$ 191	$ (163)	$ 112	$ (163)

Securities - Narrative (Details

Securities - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) bonds debt_security	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) bonds debt_security	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0		$ 0		$ 0
Transferred Securities, Unrealized Loss, Before Tax	107,300,000		107,300,000		113,500,000
Securities transferred, Unrealized Loss, Net of Tax	84,800,000		84,800,000		89,700,000
Fair value of securities transferred from AFS to HTM			0		0
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Net gain (loss) on sale of securities AFS	(1,929,000)	$ 11,000	(2,510,000)	$ (5,590,000)
Gross realized losses on AFS securities			6,100,000	1,400,000
Realized loss, impairment	868,000
Realized loss, sale of municipal securities	685,000
Realized loss, unwind of fair value hedges	183,000
Gross realized gains on AFS securities			88,000	7,000,000
Proceeds from sale of AFS securities			126,248,000	747,434,000
Sold at par value	10,000,000
Equity investments	9,722,000		9,722,000		9,691,000
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Sale of HTM portfolio	0	0	0	0
Interest receivable	37,888,000		37,888,000		50,489,000
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	271		271
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 486,297,000	325,823,000	$ 486,297,000	325,823,000	560,510,000	$ 199,252,000
Less: Net gains recognized during the period on equity investments sold during the period	0	0	0	5,058,000
Debt Securities, Available-for-Sale, Accrued Interest	8,400,000		8,400,000		15,400,000
Debt Securities, Held-to-Maturity, Accrued Interest	$ 8,200,000		$ 8,200,000		13,700,000
Held-To-Maturity Securities, Number Of Bonds Below Investment Grade | bonds	2		2
Gain (Loss) on Hedging Activity			$ 3,500,000		6,500,000
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	2,100,000,000		2,100,000,000		2,280,000,000
Asset Pledged As Collateral, Excess Amount
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities	352,600,000		352,600,000		213,100,000
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, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Abstract]
Loans	$ 4,578,048		$ 4,524,510
Less: Allowance for loan losses	44,276	$ 42,407	42,674	$ 41,760	$ 36,303	$ 36,515
Total loans	4,533,772		4,481,836
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	585,817		789,744
Less: Allowance for loan losses	5,155	4,734	5,287	4,414	3,395	3,164
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	755,406		696,738
Less: Allowance for loan losses	2,790	2,704	2,840	2,739	2,660	2,173
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	2,422,612		2,168,451
Less: Allowance for loan losses	33,759	31,841	32,266	32,339	28,012	28,701
Commercial loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	358,854		366,893
Less: Allowance for loan losses	2,400	2,942	2,086	2,069	2,017	2,235
Municipal loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	402,041		441,168
Less: Allowance for loan losses	15	18	19	20	37	45
Loans to individuals
Loans and Leases Receivable Disclosure [Abstract]
Loans	53,318		61,516
Less: Allowance for loan losses	$ 157	$ 168	$ 176	$ 179	$ 182	$ 197

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			12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 367,990		$ 367,990			$ 839,785
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	796,237		796,237			1,199,738
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,215,364		1,215,364			961,538
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	826,096		826,096			365,469
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	339,901		339,901			217,076
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	725,770		725,770			613,986
Financing Receivable, Excluding Accrued Interest, Revolving	306,690		306,690			326,918
Loans	4,578,048		4,578,048			4,524,510
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff			1,235	[1]		2,427	[2]
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			398			586
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			120			105
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			69			46
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			43			818
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff			263			222
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff			0			0
Loans charged-off	773	$ 1,262	2,128		$ 2,632	4,204
Construction Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	72,214		72,214			146,040
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	125,801		125,801			253,827
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	194,652		194,652			197,077
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	18,664		18,664			37,997
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4,493		4,493			3,945
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,105		7,105			6,500
Financing Receivable, Excluding Accrued Interest, Revolving	162,888		162,888			144,358
Loans	585,817		585,817			789,744
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			24			92
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff			0			0
Loans charged-off	0	0	24		63	92
Construction Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	71,994		71,994			132,838
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	125,687		125,687			236,573
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	99,870		99,870			196,311
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	17,993		17,993			37,997
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4,052		4,052			3,938
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,019		7,019			6,457
Financing Receivable, Excluding Accrued Interest, Revolving	161,656		161,656			144,358
Loans	488,271		488,271			758,472
Construction Real Estate Loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	220		220			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0			7,798
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	71,129		71,129			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	441		441			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0			0
Financing Receivable, Excluding Accrued Interest, Revolving	1,232		1,232			0
Loans	73,022		73,022			7,798
Construction Real Estate Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0			13,166
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0			9,456
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0			698
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	610		610			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0			7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	74		74			0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	684		684			23,327
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			36
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	114		114			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	23,653		23,653			68
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	61		61			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			43
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	23,828		23,828			147
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			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	12		12			0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	12		12			0
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	39,860		39,860			41,845
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	64,616		64,616			126,981
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	157,973		157,973			145,744
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	145,229		145,229			116,280
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	110,073		110,073			63,710
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	236,057		236,057			200,301
Financing Receivable, Excluding Accrued Interest, Revolving	1,598		1,598			1,877
Loans	755,406		755,406			696,738
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			31			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			10			1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff			220			118
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff			0			0
Loans charged-off	133	0	261		71	119
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	39,810		39,810			41,520
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	64,391		64,391			126,981
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	157,973		157,973			145,671
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	144,490		144,490			114,631
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	108,906		108,906			63,710
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	233,187		233,187			196,651
Financing Receivable, Excluding Accrued Interest, Revolving	1,598		1,598			1,803
Loans	750,355		750,355			690,967
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	0		0			32
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			32
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			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	508		508			75
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	508		508			75
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	50		50			325
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	225		225			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0			73
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	231		231			1,379
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,167		1,167			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,662		2,662			3,259
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			74
Loans	4,335		4,335			5,110
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			163
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	208		208			391
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	208		208			554
Commercial Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	171,265		171,265			511,547
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	488,776		488,776			676,863
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	733,293		733,293			495,713
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	572,370		572,370			144,456
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	171,437		171,437			102,794
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	280,504		280,504			220,585
Financing Receivable, Excluding Accrued Interest, Revolving	4,967		4,967			16,493
Loans	2,422,612		2,422,612			2,168,451
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0			788
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff			0			0
Loans charged-off	0	0	0		0	788
Commercial Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	167,260		167,260			469,844
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	469,960		469,960			641,577
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	658,916		658,916			495,363
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	571,720		571,720			143,150
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	168,752		168,752			91,085
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	250,200		250,200			189,021
Financing Receivable, Excluding Accrued Interest, Revolving	4,967		4,967			16,493
Loans	2,291,775		2,291,775			2,046,533
Commercial Real Estate Loans | Pass Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0			24,300
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	15,094		15,094			34,424
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	54,106		54,106			255
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0			1,037
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2,430		2,430			333
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	11,194		11,194			146
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	82,824		82,824			60,495
Commercial Real Estate Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4,005		4,005			17,403
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	19,436		19,436			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	563		563			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0			9,746
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	13,393		13,393			25,072
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	37,397		37,397			52,221
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	3,722		3,722			862
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	835		835			95
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	87		87			269
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	255		255			1,565
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5,597		5,597			6,346
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	10,496		10,496			9,137
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			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0			65
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	120		120			0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	120		120			65
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	66,127		66,127			78,533
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	68,947		68,947			65,118
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	60,770		60,770			42,437
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	17,069		17,069			10,724
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	7,001		7,001			4,485
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	4,310		4,310			3,622
Financing Receivable, Excluding Accrued Interest, Revolving	134,630		134,630			161,974
Loans	358,854		358,854			366,893
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff			23			745
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			310			440
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			83			44
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			67			26
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0			23
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff			11			5
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff			0			0
Loans charged-off	127	744	494		1,113	1,283
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	65,558		65,558			78,090
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	66,550		66,550			62,192
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	58,740		58,740			42,114
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	15,720		15,720			10,708
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	6,927		6,927			4,356
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	3,541		3,541			3,310
Financing Receivable, Excluding Accrued Interest, Revolving	126,939		126,939			161,153
Loans	343,975		343,975			361,923
Commercial 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	32		32			128
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	697		697			117
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	985		985			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	74		74			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	588		588			18
Financing Receivable, Excluding Accrued Interest, Revolving	4,375		4,375			0
Loans	6,751		6,751			263
Commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	409		409			191
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,018		2,018			174
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	171		171			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	263		263			16
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	117		117			162
Financing Receivable, Excluding Accrued Interest, Revolving	2,289		2,289			0
Loans	5,267		5,267			543
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	61		61			14
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	283		283			2,357
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,042		1,042			73
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	32		32			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0			65
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	16		16			12
Financing Receivable, Excluding Accrued Interest, Revolving	1,027		1,027			821
Loans	2,461		2,461			3,342
Commercial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	99		99			238
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	64		64			267
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	120		120			133
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	69		69			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0			64
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	48		48			120
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	400		400			822
Municipal loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,949		1,949			39,028
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	35,057		35,057			61,429
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	59,447		59,447			68,979
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	65,666		65,666			49,746
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	43,395		43,395			39,949
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	196,527		196,527			182,037
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	402,041		402,041			441,168
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff			0			0
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff			0			0
Loans charged-off	0	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	1,949		1,949			39,028
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	35,057		35,057			61,429
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	59,447		59,447			68,979
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	65,666		65,666			49,746
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	43,395		43,395			39,949
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	196,527		196,527			182,037
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	402,041		402,041			441,168
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			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 | 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	16,575		16,575			22,792
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	13,040		13,040			15,520
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	9,229		9,229			11,588
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	7,098		7,098			6,266
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	3,502		3,502			2,193
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,267		1,267			941
Financing Receivable, Excluding Accrued Interest, Revolving	2,607		2,607			2,216
Loans	53,318		53,318			61,516
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff			1,212	[1]		1,682
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			33			54
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			37			61
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			2			20
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			33			6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff			32			99
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff			0			0
Loans charged-off	513	$ 518	1,349		$ 1,385	1,922
Loans to individuals | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	16,564		16,564			22,788
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	13,034		13,034			15,503
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	9,161		9,161			11,588
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	7,095		7,095			6,256
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	3,502		3,502			2,180
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,256		1,256			941
Financing Receivable, Excluding Accrued Interest, Revolving	2,607		2,607			2,216
Loans	53,219		53,219			61,472
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	11		11			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2		2			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	53		53			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			13
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	11		11			0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0			0
Loans	77		77			13
Loans to individuals | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0			4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	4		4			17
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	15		15			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	3		3			10
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	$ 22		22			31
Demand Deposit Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff			$ 900			$ 1,700
[1]Includes $900,000 in charged off demand deposit overdrafts reported as 2024 originations.[2]Includes $1.7 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, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans	$ 4,578,048	$ 4,524,510
Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	4,569,948	4,513,888
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,900	7,560
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,473	1,156
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	727	1,906
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	8,100	10,622
Construction Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	585,817	789,744
Construction Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	585,497	789,241
Construction Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	320	474
Construction Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	29
Construction Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	320	503
1-4 Family Residential Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	755,406	696,738
1-4 Family Residential Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	754,441	689,626
1-4 Family Residential Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	439	4,638
1-4 Family Residential Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	471	774
1-4 Family Residential Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	55	1,700
1-4 Family Residential Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	965	7,112
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	2,422,612	2,168,451
Commercial Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	2,418,551	2,167,756
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	194	621
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,837	34
Commercial Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	30	40
Commercial Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,061	695
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans	358,854	366,893
Commercial loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	356,183	364,726
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	879	1,693
Commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,150	347
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	642	127
Commercial loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,671	2,167
Municipal loans
Financing Receivable, Past Due [Line Items]
Loans	402,041	441,168
Municipal loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	402,041	441,141
Municipal loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	27
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	27
Loans to individuals
Financing Receivable, Past Due [Line Items]
Loans	53,318	61,516
Loans to individuals | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	53,235	61,398
Loans to individuals | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	68	107
Loans to individuals | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	15	1
Loans to individuals | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	10
Loans to individuals | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	$ 83	$ 118

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, 2024	Dec. 31, 2023
Nonperforming Assets [Line Items]
Modified in period, amount		$ 362	$ 506
Nonperforming Assets
Nonperforming Assets [Line Items]
Nonaccrual loans	[1]	7,254	3,889
Accruing loans past due more than 90 days		0	0
Modified in period, amount		0	13
OREO		388	99
Repossessed assets		14	0
Total nonperforming assets		7,656	4,001
Nonperforming Assets | Construction Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		150	29
Nonperforming Assets | 1-4 Family Residential Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		1,346	2,093
Nonperforming Assets | Commercial Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		3,929	528
Nonperforming Assets | Commercial loans
Nonperforming Assets [Line Items]
Nonaccrual loans		1,796	1,208
Nonperforming Assets | Loans to individuals
Nonperforming Assets [Line Items]
Nonaccrual loans		$ 33	$ 31
[1]Includes $362,000 and $506,000 of restructured loans as of September 30, 2024 and December 31, 2023, respectively.

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	$ 42,407	$ 36,303	$ 42,674	$ 36,515	$ 36,515
Loans charged-off	(773)	(1,262)	(2,128)	(2,632)	(4,204)
Recoveries of loans charged-off	365	378	1,156	1,170
Net loans (charged-off) recovered	(408)	(884)	(972)	(1,462)
Provision for (reversal of) loan losses	2,277	6,341	2,574	6,707
Balance at end of period	44,276	41,760	44,276	41,760	42,674
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	4,734	3,395	5,287	3,164	3,164
Loans charged-off	0	0	(24)	(63)	(92)
Recoveries of loans charged-off	0	0	0	1
Net loans (charged-off) recovered	0	0	(24)	(62)
Provision for (reversal of) loan losses	421	1,019	(108)	1,312
Balance at end of period	5,155	4,414	5,155	4,414	5,287
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,704	2,660	2,840	2,173	2,173
Loans charged-off	(133)	0	(261)	(71)	(119)
Recoveries of loans charged-off	47	62	91	108
Net loans (charged-off) recovered	(86)	62	(170)	37
Provision for (reversal of) loan losses	172	17	120	529
Balance at end of period	2,790	2,739	2,790	2,739	2,840
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	31,841	28,012	32,266	28,701	28,701
Loans charged-off	0	0	0	0	(788)
Recoveries of loans charged-off	1	0	4	1
Net loans (charged-off) recovered	1	0	4	1
Provision for (reversal of) loan losses	1,917	4,327	1,489	3,637
Balance at end of period	33,759	32,339	33,759	32,339	32,266
Commercial loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,942	2,017	2,086	2,235	2,235
Loans charged-off	(127)	(744)	(494)	(1,113)	(1,283)
Recoveries of loans charged-off	92	65	339	268
Net loans (charged-off) recovered	(35)	(679)	(155)	(845)
Provision for (reversal of) loan losses	(507)	731	469	679
Balance at end of period	2,400	2,069	2,400	2,069	2,086
Municipal loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	18	37	19	45	45
Loans charged-off	0	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	(3)	(17)	(4)	(25)
Balance at end of period	15	20	15	20	19
Loans to individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	168	182	176	197	197
Loans charged-off	(513)	(518)	(1,349)	(1,385)	(1,922)
Recoveries of loans charged-off	225	251	722	792
Net loans (charged-off) recovered	(288)	(267)	(627)	(593)
Provision for (reversal of) loan losses	277	264	608	575
Balance at end of period	$ 157	$ 179	$ 157	$ 179	$ 176

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) loans loan	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) loans loan	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 0		$ 0		$ 1,000
Reversal of interest income on nonaccrual loans	13	$ 13	75	$ 78
Nonaccrual loans, no allowance	4,500		4,500		1,000
Collateral-dependent loans	$ 11,500		$ 11,500		7,500
Number of loans modified, nonaccrual | loans	3		3
Modified in period, amount			$ 362		506
Restructured loans in default			289	0
Accrued interest receivable on our loan portfolio	$ 21,300		21,300		$ 21,300
Extended Maturity
Financing Receivable, Allowance for Credit Loss [Line Items]
Modified in period, amount	25		$ 25
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term			20 years
Owner and nonowner-occupied real estate	1,850,000		$ 1,850,000
Loans secured by multi-family properties	547,700		547,700
Loans secured by farmland	$ 27,700		$ 27,700
Commercial loans | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Modified in period, amount				$ 358
Number of loans modified				4
Commercial loans | Extended Maturity
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loans modified, nonaccrual | loan	1		1
Commercial loans | Extended Maturity | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Modified in period, amount				$ 293
Commercial loans | Extended Maturity and Interest Rate Reduction | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Modified in period, amount				$ 65
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, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Other borrowings		$ 105,810	$ 509,820
FHLB borrowings		760,046	212,648
Other borrowings:
Debt Instrument [Line Items]
Other borrowings		105,810	509,820
Average amount outstanding during the period	[1]	227,117	436,676
Maximum amount outstanding during the period	[2]	$ 597,765	$ 1,030,421
Weighted average interest rate during the period	[3]	5.80%	4.90%
Interest rate at end of the period	[4]	4.20%	5%
FHLB borrowings:
Debt Instrument [Line Items]
FHLB borrowings		$ 760,046	$ 212,648
Average amount outstanding during the period	[1]	610,893	276,584
Maximum amount outstanding during the period	[2]	$ 760,046	$ 533,242
Weighted average interest rate during the period	[3]	4.10%	2.50%
Interest rate at end of the period	[5]	4.20%	1.20%
[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. The maximum amount outstanding at any month-end during the period. 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. Stated rate. 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, 2024 USD ($)
Debt Instrument [Line Items]
Less than 1 Year	$ 864,524
1-2 Years	582
2-3 Years	401
3-4 Years	349
4-5 Years	0
Thereafter	0
Total	865,856
Other borrowings:
Debt Instrument [Line Items]
Less than 1 Year	105,810
1-2 Years	0
2-3 Years	0
3-4 Years	0
4-5 Years	0
Thereafter	0
Total	105,810
FHLB borrowings:
Debt Instrument [Line Items]
Less than 1 Year	758,714
1-2 Years	582
2-3 Years	401
3-4 Years	349
4-5 Years	0
Thereafter	0
Total	$ 760,046

Borrowing Arrangements Narrativ

Borrowing Arrangements Narrative (Details)	9 Months Ended
	Sep. 30, 2024 USD ($) oustanding_letters_of_credit credit_line	Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Number of credit lines maintained by the Company | credit_line	3
Federal funds purchased	$ 0	$ 0
Maturity of repurchase agreements (less than)	1 year
Securities sold under repurchase agreements	$ 80,800,000	92,100,000
Federal Home Loan Bank borrowings, additional funding available	1,800,000,000
Asset Pledged As Collateral, Excess Amount
Line of Credit Facility [Line Items]
Debt Securities	352,600,000	213,100,000
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
Amegy Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 25,000,000
FHLB
Line of Credit Facility [Line Items]
Number of outstanding letters of credit | oustanding_letters_of_credit	1
Letters of Credit Outstanding, Amount	$ 6,100,000
Minimum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	0.28%
Federal Home Loan Bank borrowings maturities	1 day
Maximum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	6.65%
Federal Home Loan Bank borrowings maturities	3 years 9 months 18 days
Federal Reserve Discount Window
Line of Credit Facility [Line Items]
Other borrowings	$ 25,000,000	300,000,000
Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Other borrowings	$ 0	$ 117,700,000

Long-term Debt Other Long-term

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

9 Months Ended

Sep. 30, 2024

Dec. 31, 2023

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]

$ 92,006

$ 93,877

Trust preferred subordinated debentures

[2]

60,273

60,270

Total long-term debt

152,279

154,147

Southside Statutory Trust III, net of unamortized debt issuance costs

Debt Instruments [Abstract]

Trust preferred subordinated debentures

20,581

[2],[3]

20,578

[2],[3]

$ 20,619

Unamortized Debt Issuance Expense

38

41

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]

92,006

93,877

Unamortized Debt Issuance Expense

$ 994

$ 1,100

Stated interest rate

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. This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations. The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $38,000 at September 30, 2024 and $41,000 at December 31, 2023. The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $994,000 at September 30, 2024 and $1.1 million at December 31, 2023.

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, 2024

Apr. 04, 2024

Dec. 31, 2023

Jun. 14, 2023

Nov. 06, 2020

Oct. 10, 2007

Debt Instrument [Line Items]

Other long-term debt

[1]

$ 60,273

$ 60,270

Southside Statutory Trust III

Debt Instrument [Line Items]

Other long-term debt

$ 20,619

20,581

[1],[2]

20,578

[1],[2]

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

Debt Instrument [Line Items]

Basis on variable rate

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

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

2.51%

Magnolia Trust Company I

Debt Instrument [Line Items]

Other long-term debt

$ 3,609

[3]

$ 3,609

[1]

$ 3,609

[1]

$ 3,600

Magnolia Trust Company I | Three-Month Secured Overnight Financing Rate (SOFR)

Debt Instrument [Line Items]

Basis on variable rate

[3]

2.06%

3.875% Subordinated Notes

Debt Instrument [Line Items]

Debt face amount

[4]

$ 100,000

Stated interest rate

3.875%

Debt instrument repurchase

$ 2,000

$ 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. The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $38,000 at September 30, 2024 and $41,000 at December 31, 2023. On April 4, 2024 and June 14, 2023, the Company repurchased $2.0 million and $5.0 million, respectively, 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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 905	$ 942	$ 2,715	$ 2,828
Expected return on assets	(1,214)	(1,143)	(3,643)	(3,430)
Net loss amortization	144	182	433	545
Net periodic benefit cost (income)	(165)	(19)	(495)	(57)
Retirement Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Interest cost	27	31	79	94
Expected return on assets	(46)	(47)	(136)	(140)
Net loss amortization	0	0	0	0
Net periodic benefit cost (income)	(19)	(16)	(57)	(46)
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	215	208	644	623
Expected return on assets	0	0	0	0
Net loss amortization	12	7	38	22
Net periodic benefit cost (income)	$ 227	$ 215	$ 682	$ 645

Employee Benefit Plans Narrativ

Employee Benefit Plans Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Noncash adjustment to employee benefit plan liabilities, consisting of changes in net loss	$ 531	$ (567)

Derivative Financial Instrume_3

Derivative Financial Instruments and Hedging Activities - Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Amortized cost	$ 271,400
Securities AFS
Derivative [Line Items]
Amortized cost of hedged assets	991,699	$ 487,486
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Items	3,581	13,642
Amortized cost	625,900
Cumulative increase (decrease)	1,200
Hedged layer, amount	201,000
Reclassification for discontinuance, before tax	(4,600)	0
Loans
Derivative [Line Items]
Amortized cost of hedged assets	271,383	0
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Items	(385)	0
Cumulative increase (decrease)	385
Hedged layer, amount	155,000
Reclassification for discontinuance, before tax	$ (4,200)	$ 0

Derivative Financial Instrume_4

Derivative Financial Instruments and Hedging Activities - Schedule Of Derivative Instruments (Details) - USD ($)		Sep. 30, 2024	Dec. 31, 2023
Asset Derivative
Gross derivatives		$ 33,665,000	$ 56,639,000
Offsetting derivative assets		(9,451,000)	(7,435,000)
Cash collateral received/posted		(22,300,000)	(46,760,000)
Net derivatives included in the consolidated balance sheets	[1]	1,914,000	2,444,000
Liability Derivative
Gross derivatives		23,806,000	25,684,000
Offsetting derivative liabilities		(9,451,000)	(7,435,000)
Cash collateral received/posted		0	0
Net derivatives included in the consolidated balance sheets	[1]	14,355,000	18,249,000
Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		790,000,000
Financial Institution Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		1,300,000	1,900,000
Financial Institution Counterparties | Derivatives designated as hedging instruments | Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	790,000,000	1,010,000,000
Asset Derivative
Gross derivatives		12,880,000	24,223,000
Liability Derivative
Gross derivatives		6,054,000	6,910,000
Financial Institution Counterparties | Derivatives designated as hedging instruments | Fair Value Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	675,875,000	453,440,000
Asset Derivative
Gross derivatives		5,781,000	13,658,000
Liability Derivative
Gross derivatives		2,748,000	16,000
Financial Institution Counterparties | Derivatives designated as non-hedging instruments | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	241,446,000	248,073,000
Asset Derivative
Gross derivatives		14,355,000	18,249,000
Liability Derivative
Gross derivatives		649,000	509,000
Customer Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		649,000	509,000
Customer Counterparties | Derivatives designated as non-hedging instruments | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	241,446,000	248,073,000
Asset Derivative
Gross derivatives		649,000	509,000
Liability Derivative
Gross derivatives		$ 14,355,000	$ 18,249,000
[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. At September 30, 2024, we had $1.3 million credit exposure related to interest rate swaps with financial institutions and $649,000 related to interest rate swaps with customers. At December 31, 2023, we had $1.9 million credit exposure related to interest rate swaps with financial institutions and $509,000 related to interest rate swaps with customers. 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_5

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, 2024	Dec. 31, 2023
Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		$ 790,000,000
Financial Institution Counterparties | Derivatives designated as non-hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 241,446,000	$ 248,073,000
Remaining Maturity		6 years 8 months 12 days	7 years 4 months 24 days
Weighted Average Receive Rate		5.48%	5.84%
Weighted Average Pay Rate		2.86%	2.88%
Financial Institution Counterparties | Cash Flow Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 790,000,000	$ 1,010,000,000
Remaining Maturity		1 year 9 months 18 days	2 years 3 months 18 days
Weighted Average Receive Rate		5.21%	5.44%
Weighted Average Pay Rate		2.62%	2.65%
Financial Institution Counterparties | Fair Value Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 675,875,000	$ 453,440,000
Remaining Maturity		3 years 1 month 6 days	5 years 4 months 24 days
Weighted Average Receive Rate		5.16%	5.37%
Weighted Average Pay Rate		3.47%	3.13%
Customer Counterparties | Derivatives designated as non-hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 241,446,000	$ 248,073,000
Remaining Maturity		6 years 8 months 12 days	7 years 4 months 24 days
Weighted Average Receive Rate		2.86%	2.88%
Weighted Average Pay Rate		5.48%	5.84%
[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_6

Derivative Financial Instruments and Hedging Activities - Derivative Included In The Consolidated Statements Of Income Related To Interest Rate Swap Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 5,688	$ 6,408	$ 18,112	$ 17,570
Derivatives designated as hedging instruments
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	5,688	6,408	18,112	17,570
Interest Rate Swap | Gain (loss) included in interest expense on deposits | Derivatives designated as hedging instruments
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	3,587	4,254	11,436	10,715
Interest Rate Swap | Gain (loss) included in interest expense on FHLB borrowings | Derivatives designated as hedging instruments
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	2,101	2,200	6,676	5,969
Interest Rate Swap | Gain (loss) included in interest expense on other borrowings | Derivatives designated as hedging instruments
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	(46)	0	886
Interest Rate Swap | Gain (loss) included in interest income on tax-exempt investment securities | Derivatives designated as hedging instruments
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	2,142	3,651	7,245	9,329
Interest Rate Swap | Gain (loss) included in interest income on MBS | Derivatives designated as hedging instruments
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	488	0	754	0
Interest Rate Swap | Gain (loss) included in interest income on loans | Derivatives designated as hedging instruments
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	504	0	591	0
Interest Rate Swap | Other noninterest income | Derivatives designated as non-hedging instruments
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 0	$ 0	$ 53	$ 160

Derivative Financial Instrume_7

Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Securities AFS, at estimated fair value	$ 1,408,437,000	$ 1,296,294,000
Cash collateral received from counterparties under master netting agreements	22,300,000	46,760,000
Gain (Loss) on Hedging Activity	3,500,000	$ 6,500,000
Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount	$ 790,000,000

Fair Value Measurement - Recurr

Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively)		$ 1,408,437	$ 1,296,294
Derivative assets	[1]	1,914	2,444
Derivative liabilities	[1]	14,355	18,249
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 $1,433,097 and $1,332,467, respectively)		174,167	139,725
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 $1,433,097 and $1,332,467, respectively)		436,927	568,745
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 $1,433,097 and $1,332,467, respectively)		14,359	14,093
Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively)	[2]	778,093	568,983
Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS, at estimated fair value (amortized cost of $1,433,097 and $1,332,467, respectively)	[2]	4,891	4,748
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		4,533,772	4,481,836
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		4,418,820	4,198,879
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		4,418,820	4,198,879
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments		5,421	5,308
Total asset fair value measurements		1,447,523	1,358,241
Total liability fair value measurements		23,806	25,684
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 $1,433,097 and $1,332,467, respectively)		174,167	139,725
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 $1,433,097 and $1,332,467, respectively)		436,927	568,745
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 $1,433,097 and $1,332,467, respectively)		14,359	14,093
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 $1,433,097 and $1,332,467, respectively)	[3]	778,093	568,983
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 $1,433,097 and $1,332,467, respectively)	[3]	4,891	4,748
Fair Value, Recurring | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		33,665	56,639
Derivative liabilities		23,806	25,684
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		5,421	5,308
Total asset fair value measurements		179,588	145,033
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 $1,433,097 and $1,332,467, respectively)		174,167	139,725
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 $1,433,097 and $1,332,467, 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 $1,433,097 and $1,332,467, 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 $1,433,097 and $1,332,467, 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 $1,433,097 and $1,332,467, 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		1,267,935	1,213,208
Total liability fair value measurements		23,806	25,684
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 $1,433,097 and $1,332,467, respectively)		0	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 $1,433,097 and $1,332,467, respectively)		436,927	568,745
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 $1,433,097 and $1,332,467, respectively)		14,359	14,093
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 $1,433,097 and $1,332,467, respectively)	[3]	778,093	568,983
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 $1,433,097 and $1,332,467, respectively)	[3]	4,891	4,748
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		33,665	56,639
Derivative liabilities		23,806	25,684
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 $1,433,097 and $1,332,467, respectively)		0	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 $1,433,097 and $1,332,467, 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 $1,433,097 and $1,332,467, 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 $1,433,097 and $1,332,467, 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 $1,433,097 and $1,332,467, 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		402	99
Total asset fair value measurements		11,355	7,099
Fair Value, Nonrecurring | Collateral Pledged
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	10,953	7,000
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		402	99
Total asset fair value measurements		11,355	7,099
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]	$ 10,953	$ 7,000
[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. At September 30, 2024, we had $1.3 million credit exposure related to interest rate swaps with financial institutions and $649,000 related to interest rate swaps with customers. At December 31, 2023, we had $1.9 million credit exposure related to interest rate swaps with financial institutions and $509,000 related to interest rate swaps with customers. 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. 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, 2024	Dec. 31, 2023
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 486,297	$ 560,510
Investment securities:
HTM, at carrying value	1,172,332	1,186,152
Mortgage-backed securities:
HTM, at carrying value	116,071	120,901
FHLB stock, at cost	40,291	11,936
Equity investments	4,301	4,383
Loans, net of allowance for loan losses	4,533,772	4,481,836
Loans held for sale	768	10,894
Financial liabilities:
Deposits	6,435,702	6,549,681
Other borrowings	105,810	509,820
FHLB borrowings	760,046	212,648
Subordinated notes, net of unamortized debt issuance costs	92,006	93,877
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,273	60,270
Estimated Fair Value
Financial assets:
Cash and cash equivalents	486,297	560,510
Investment securities:
HTM, at carrying value	1,060,369	1,054,739
Mortgage-backed securities:
HTM, at carrying value	109,154	111,423
FHLB stock, at cost	40,291	11,936
Equity investments	4,301	4,383
Loans, net of allowance for loan losses	4,418,820	4,198,879
Loans held for sale	768	10,894
Financial liabilities:
Deposits	6,436,589	6,534,929
Other borrowings	105,668	510,242
FHLB borrowings	755,052	202,750
Subordinated notes, net of unamortized debt issuance costs	85,253	86,285
Trust preferred subordinated debentures, net of unamortized debt issuance costs	51,946	57,480
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	486,297	560,510
Investment securities:
HTM, at carrying value	0	0
Mortgage-backed securities:
HTM, at carrying value	0	0
FHLB stock, at cost	0	0
Equity investments	0	0
Loans, net of allowance for loan losses	0	0
Loans held for sale	0	0
Financial liabilities:
Deposits	0	0
Other borrowings	0	0
FHLB borrowings	0	0
Subordinated notes, net of unamortized debt issuance costs	0	0
Trust preferred subordinated debentures, net of unamortized debt issuance costs	0	0
Estimated Fair Value | Level 2
Financial assets:
Cash and cash equivalents	0	0
Investment securities:
HTM, at carrying value	1,060,369	1,054,739
Mortgage-backed securities:
HTM, at carrying value	109,154	111,423
FHLB stock, at cost	40,291	11,936
Equity investments	4,301	4,383
Loans, net of allowance for loan losses	0	0
Loans held for sale	768	10,894
Financial liabilities:
Deposits	6,436,589	6,534,929
Other borrowings	105,668	510,242
FHLB borrowings	755,052	202,750
Subordinated notes, net of unamortized debt issuance costs	85,253	86,285
Trust preferred subordinated debentures, net of unamortized debt issuance costs	51,946	57,480
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	4,418,820	4,198,879
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, 2024 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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Current income tax expense	$ 5,283	$ 4,672	$ 15,102	$ 14,099
Deferred income tax expense (benefit)	(893)	(1,552)	(878)	(1,868)
Income tax expense	$ 4,390	$ 3,120	$ 14,224	$ 12,231

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Deferred tax assets, net	$ 32,600,000		$ 32,600,000		$ 30,400,000
Deferred tax assets, valuation allowance	0		0		$ 0
Income tax expense	$ 4,390,000	$ 3,120,000	$ 14,224,000	$ 12,231,000
Effective income tax rate, percent	17.60%	14.50%	17.60%	15%

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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 3,208	$ 3,207	$ 3,932	$ 3,687
Provision for (reversal of) off-balance-sheet credit exposures	112	646	(612)	166
Balance at end of period	$ 3,320	$ 3,853	$ 3,320	$ 3,853

Off-Balance-Sheet Arrangement_4

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 895,150	$ 1,093,150
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	877,223	1,082,327
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 17,927	$ 10,823

Off-Balance-Sheet Arrangement_5

Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 0	$ 372,000	$ 603,000
Operating lease ROU assets	14,007,000		14,007,000		$ 14,837,000
Unsettled trades to purchase securities	19,904,000	$ 24,917,000	19,904,000	$ 24,917,000	0
Unsettled trades to sell securities	0		0		0
Unsettled Issuances of Brokered CDs	$ 0		$ 0		$ 0