Southside Bancshares (SBSI) 10-Q 26 Apr 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	Apr. 24, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 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		30,284,712
Entity Central Index Key	0000705432
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)		Mar. 31, 2024	Dec. 31, 2023
ASSETS
Cash and due from banks		$ 96,744,000	$ 122,021,000
Interest earning deposits		307,257,000	391,719,000
Federal funds sold		65,372,000	46,770,000
Total cash and cash equivalents		469,373,000	560,510,000
Securities AFS, at estimated fair value (amortized cost of $1,454,043 and $1,332,467, respectively)		1,405,221,000	1,296,294,000
Securities HTM (estimated fair value of $1,152,186 and $1,166,162, respectively)		1,306,898,000	1,307,053,000
FHLB stock, at cost		27,958,000	11,936,000
Equity investments		9,554,000	9,691,000
Loans held for sale		756,000	10,894,000
Loans:
Loans		4,577,368,000	4,524,510,000
Less: Allowance for loan losses		(43,557,000)	(42,674,000)
Net loans		4,533,811,000	4,481,836,000
Premises and equipment, net		139,491,000	138,950,000
Operating lease ROU assets		14,876,000	14,837,000
Goodwill		201,116,000	201,116,000
Other intangible assets, net		2,588,000	2,925,000
Interest receivable		39,716,000	50,489,000
Deferred tax asset, net		29,876,000	30,426,000
Unsettled trades to sell securities		6,406,000	0
BOLI		136,604,000	136,330,000
Other assets		29,619,000	31,627,000
Total assets		8,353,863,000	8,284,914,000
Deposits:
Noninterest bearing		1,358,827,000	1,390,407,000
Interest bearing		5,186,933,000	5,159,274,000
Total deposits		6,545,760,000	6,549,681,000
Other borrowings		457,685,000	509,820,000
FHLB borrowings		312,466,000	212,648,000
Subordinated notes, net of unamortized debt issuance costs	[1]	93,913,000	93,877,000
Trust preferred subordinated debentures, net of unamortized debt issuance costs		60,271,000	60,270,000
Unsettled trades to purchase securities		7,160,000	0
Operating lease liabilities		16,744,000	16,704,000
Other liabilities		71,942,000	68,626,000
Total liabilities		7,565,941,000	7,511,626,000
Off-balance-sheet arrangements, commitments and contingencies (Note 12)
Shareholders’ equity:
Common stock:  ($1.25 par value, 80,000,000 shares authorized, 38,050,389 shares issued at March 31, 2024 and 38,039,706 shares issued at December 31, 2023)		47,563,000	47,550,000
Paid-in capital		789,964,000	788,840,000
Retained earnings		292,879,000	282,355,000
Treasury stock: (shares at cost, 7,766,701 at March 31, 2024 and 7,790,276 at December 31, 2023)		(231,625,000)	(231,995,000)
AOCI		(110,859,000)	(113,462,000)
Total shareholders’ equity		787,922,000	773,288,000
Total liabilities and shareholders’ equity		$ 8,353,863,000	$ 8,284,914,000
[1] This debt consists of subordinated notes with a remaining maturity greater than one year that qualify under the risk-based capital guidelines as Tier 2 capital, subject to certain limitations.

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale [Abstract]
Securities AFS, at estimated fair value	$ 1,454,043	$ 1,332,467
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held-to-maturity, fair value	$ 1,152,186	$ 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)	38,050,389	38,039,706
Shares purchased (in shares)	7,766,701	7,790,276

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income:
Loans	$ 68,211	$ 54,776
Taxable investment securities	6,967	5,712
Tax-exempt investment securities	11,088	13,916
MBS	10,119	4,329
FHLB stock and equity investments	333	245
Other interest earning assets	6,040	1,870
Total interest income	102,758	80,848
Interest expense:
Deposits	38,198	19,906
FHLB borrowings	5,950	3,141
Subordinated notes	956	999
Trust preferred subordinated debentures	1,175	1,031
Other borrowings	3,131	2,418
Total interest expense	49,410	27,495
Net interest income	53,348	53,353
Provision for (reversal of) credit losses	58	(40)
Net interest income after provision for credit losses	53,290	53,393
Noninterest income:
Deposit services	5,985	6,422
Net gain (loss) on sale of securities AFS	(18)	(2,146)
Net gain on sale of equity securities	0	2,416
Gain (loss) on sale of loans	(436)	104
Trust fees	1,336	1,467
BOLI	784	1,675
Brokerage services	1,014	697
Other	1,059	1,398
Total noninterest income	9,724	12,033
Noninterest expense:
Salaries and employee benefits	23,113	21,856
Net occupancy	3,362	3,734
Advertising, travel & entertainment	950	1,050
ATM expense	325	355
Professional fees	1,154	1,372
Software and data processing	2,856	2,055
Communications	449	327
FDIC insurance	943	544
Amortization of intangibles	337	478
Other	3,392	3,078
Total noninterest expense	36,881	34,849
Income before income tax expense	26,133	30,577
Income tax expense	4,622	4,543
Net income	$ 21,511	$ 26,034
Earnings per common share - basic (in dollars per share)	$ 0.71	$ 0.83
Earnings per common share - diluted (in dollars per share)	0.71	0.83
Cash dividends paid per common share (in dollars per share)	$ 0.36	$ 0.35

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 21,511	$ 26,034
Securities AFS and transferred securities:
Change in unrealized holding gain (loss) on AFS securities during the period	(5,887)	13,019
Reclassification adjustment for amortization related to AFS and HTM debt securities	2,023	1,992
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income	18	2,146
Derivatives:
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives	13,616	(6,976)
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges	(6,642)	(5,108)
Pension plans:
Amortization of net actuarial loss, included in net periodic benefit cost	167	173
Other comprehensive income (loss), before tax	3,295	5,246
Income tax (expense) benefit related to items of other comprehensive income (loss)	(692)	(1,102)
Other comprehensive income (loss), net of tax	2,603	4,144
Comprehensive income (loss)	$ 24,114	$ 30,178

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, 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)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for dividend reinvestment plan (in shares)	10,683	8,026
Common stock purchased (in shares)		457,394
Net issuance of common stock under employee stock plans (in shares)	23,575	23,919
Cash dividends paid on common stock (in dollars per share)	$ 0.36	$ 0.35

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
OPERATING ACTIVITIES:
Net income	$ 21,511,000	$ 26,034,000
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	2,468,000	2,636,000
Securities premium amortization (discount accretion), net	1,686,000	3,586,000
Loan (discount accretion) premium amortization, net	114,000	89,000
Provision for (reversal of) credit losses	58,000	(40,000)
Stock compensation expense	756,000	914,000
Deferred tax expense (benefit)	(142,000)	(194,000)
Net (gain) loss on sale of AFS securities	18,000	2,146,000
Net gain on sale of equity securities	0	(2,416,000)
Net loss on premises and equipment	6,000	4,000
Gross proceeds from sales of loans held for sale	4,824,000	4,309,000
Gross originations of loans held for sale	(2,778,000)	(4,049,000)
Net (gain) loss on consumer receivables	512,000	0
Net (gain) loss on OREO	0	(51,000)
Net change in:
Interest receivable	10,773,000	14,460,000
Other assets	17,911,000	(3,082,000)
Interest payable	(1,612,000)	3,253,000
Other liabilities	2,187,000	(23,968,000)
Net cash provided by (used in) operating activities	58,292,000	23,631,000
Securities AFS:
Purchases	(386,212,000)	(361,685,000)
Sales	917,000	237,316,000
Maturities, calls and principal repayments	264,068,000	8,617,000
Securities HTM:
Maturities, calls and principal repayments	879,000	14,970,000
Proceeds from sales of equity securities	0	3,785,000
Proceeds from redemption of FHLB stock and equity investments	29,930,000	18,370,000
Purchases of FHLB stock and equity investments	(45,815,000)	(25,973,000)
Net loan paydowns (originations)	(53,390,000)	(5,342,000)
Proceeds from sales of customer receivables	7,600,000	0
Purchases of premises and equipment	(2,565,000)	(2,183,000)
Proceeds from (purchases of) BOLI	1,549,000	0
Proceeds from sales of premises and equipment	(2,000)	0
Net proceeds from sales of OREO	0	144,000
Proceeds from sales of repossessed assets	91,000	93,000
Net cash provided by (used in) investing activities	(182,950,000)	(111,888,000)
FINANCING ACTIVITIES:
Net change in deposits	(3,926,000)	(359,846,000)
Net change in other borrowings	(52,135,000)	404,474,000
Proceeds from FHLB borrowings	1,580,000,000	1,078,000,000
Repayment of FHLB borrowings	(1,480,182,000)	(898,175,000)
Proceeds from stock option exercises	434,000	640,000
Cash paid to tax authority related to tax withholding on share-based awards	(84,000)	(68,000)
Purchase of common stock	0	(14,842,000)
Proceeds from the issuance of common stock for dividend reinvestment plan	306,000	302,000
Cash dividends paid	(10,892,000)	(10,988,000)
Net cash provided by (used in) financing activities	33,521,000	199,497,000
Net increase (decrease) in cash and cash equivalents	(91,137,000)	111,240,000
Cash and cash equivalents at beginning of period	560,510,000	199,252,000
Cash and cash equivalents at end of period	469,373,000	310,492,000
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	51,022,000	24,242,000
Income taxes paid	0	0
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	113,000	13,000
Unsettled trades to purchase securities	(7,160,000)	0
Unsettled trades to sell securities	6,406,000	4,044,000
Unsettled trades to repurchase common stock	$ 0	$ (957,000)

Summary of Significant Accounti

Summary of Significant Accounting and Reporting Policies	3 Months Ended
	Mar. 31, 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 Annual Report on Form 10-K for the year ended December 31, 2023. Accounting Changes and Reclassifications

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Earnings per share on a basic and diluted basis are calculated as follows (in thousands, except per share amounts): Three Months Ended 2024 2023 Basic and Diluted Earnings: Net income $ 21,511 $ 26,034 Basic weighted-average shares outstanding 30,262 31,372 Add: Stock awards 43 92 Diluted weighted-average shares outstanding 30,305 31,464 Basic earnings per share: Net income $ 0.71 $ 0.83 Diluted earnings per share: Net income $ 0.71 $ 0.83 For the three months ended March 31, 2024, there were approximately 630,000 anti-dilutive shares. For the three months ended March 31, 2023, there were 121,000 anti-dilutive shares.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 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 March 31, 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 income (loss) before reclassifications (5,887) 13,616 — 7,729 Reclassification adjustments included in net income 2,041 (6,642) 167 (4,434) Income tax (expense) benefit 807 (1,465) (34) (692) Net current-period other comprehensive income (loss), net of tax (3,039) 5,509 133 2,603 Ending balance, net of tax $ (110,538) $ 18,312 $ (18,633) $ (110,859) Three Months Ended March 31, 2023 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (149,181) $ 31,227 $ (19,502) $ (137,456) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications 13,019 (6,976) — 6,043 Reclassification adjustments included in net income 4,138 (5,108) 173 (797) Income tax (expense) benefit (3,603) 2,537 (36) (1,102) Net current-period other comprehensive income (loss), net of tax 13,554 (9,547) 137 4,144 Ending balance, net of tax $ (135,627) $ 21,680 $ (19,365) $ (133,312) The reclassification adjustments out of accumulated other comprehensive income (loss) included in net income are presented below (in thousands): Three Months Ended 2024 2023 Unrealized gains and losses on securities transferred: Amortization of unrealized gains and losses (1) $ (2,023) $ (1,992) Tax benefit 425 418 Net of tax (1,598) (1,574) Unrealized gains and losses on available for sale securities: Realized net gain (loss) on sale of securities (2) (18) (2,146) Tax (expense) benefit 4 451 Net of tax (14) (1,695) Derivatives: Realized net gain (loss) on interest rate swap derivatives (3) 6,642 5,108 Tax benefit (1,395) (1,072) Net of tax 5,247 4,036 Amortization of pension plan: Net actuarial loss (4) (167) (173) Tax benefit 34 36 Net of tax (133) (137) Total reclassifications for the period, net of tax $ 3,502 $ 630 (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	3 Months Ended
	Mar. 31, 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 March 31, 2024 and December 31, 2023 are reflected in the tables below (in thousands): March 31, 2024 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 139,205 $ — $ 19 $ 139,186 State and political subdivisions 594,449 126 46,030 548,545 Corporate bonds and other 14,587 37 915 13,709 MBS: (1) Residential 700,572 2,613 4,108 699,077 Commercial 5,230 30 556 4,704 Total $ 1,454,043 $ 2,806 $ 51,628 $ 1,405,221 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,039,958 $ 6,658 $ 138,034 $ 908,582 Corporate bonds and other 146,884 437 12,847 134,474 MBS: (1) Residential 89,952 9 8,578 81,383 Commercial 30,104 — 2,357 27,747 Total $ 1,306,898 $ 7,104 $ 161,816 $ 1,152,186 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. We did not transfer any securities from AFS to HTM during the three months ended March 31, 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 $111.5 million ($88.1 million, net of tax) at March 31, 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. We transferred these securities due to overall balance sheet strategies, and our management has the current intent and ability to hold these securities until maturity. Investment securities and MBS with carrying values of $2.31 billion and $2.28 billion were pledged as of March 31, 2024 and December 31, 2023, respectively, to collateralize FHLB borrowings, borrowings from the FRDW, including from the BTFP, repurchase agreements and public fund deposits, for potential liquidity needs or other purposes as required by law. At March 31, 2024 and December 31, 2023, the amount of excess collateral at the FRDW was $251.9 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 March 31, 2024 and December 31, 2023, segregated by major security type and length of time in a continuous loss position (in thousands): March 31, 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: U.S. Treasury $ 139,186 $ 19 $ — $ — $ 139,186 $ 19 State and political subdivisions 7,464 73 524,101 45,957 531,565 46,030 Corporate bonds and other 3,450 108 9,332 807 12,782 915 MBS: Residential 249,034 980 35,223 3,128 284,257 4,108 Commercial — — 2,455 556 2,455 556 Total $ 399,134 $ 1,180 $ 571,111 $ 50,448 $ 970,245 $ 51,628 HELD TO MATURITY Investment securities: State and political subdivisions $ 35,016 $ 563 $ 711,680 $ 137,471 $ 746,696 $ 138,034 Corporate bonds and other 2,714 125 126,059 12,722 128,773 12,847 MBS: Residential — — 80,792 8,578 80,792 8,578 Commercial — — 27,747 2,357 27,747 2,357 Total $ 37,730 $ 688 $ 946,278 $ 161,128 $ 984,008 $ 161,816 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. For those AFS debt securities in an unrealized loss position that do not meet either of these criteria, management assesses whether the decline in fair value has resulted from credit-related factors, using both qualitative and quantitative criteria. Determining the allowance under the credit loss method requires the use of a discounted cash flow method to assess the credit losses. Any credit-related impairment will be recognized in allowance for credit losses on the balance sheet with a corresponding adjustment to earnings. Noncredit-related temporary impairment, the portion of the impairment relating to factors other than credit (such as changes in market interest rates), is recognized in other comprehensive income, net of tax. As of March 31, 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 396 AFS debt securities in an unrealized loss position at March 31, 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 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 March 31, 2024, three 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, 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 months ended March 31, 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 March 31, 2024, accrued interest receivable on AFS and HTM debt securities totaled $9.8 million and $8.4 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 March 31, 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 $ 2,023 $ 697 State and political subdivisions 14,269 17,099 Corporate bonds and other 1,763 1,832 MBS 10,119 4,329 Total interest income on securities $ 28,174 $ 23,957 There was a $18,000 net realized loss as a result of sales from the AFS securities portfolio for the three months ended March 31, 2024, which consisted of $79,000 in realized losses and $61,000 in realized gains. There was a $2.1 million net realized loss as a result of sales from the AFS securities portfolio for the three months ended March 31, 2023, which consisted of $3.3 million in realized losses and $1.1 million in realized gains. There were no sales from the HTM portfolio during the three months ended March 31, 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 March 31, 2024, are presented below by contractual maturity (in thousands): March 31, 2024 Amortized Cost Fair Value AVAILABLE FOR SALE Investment securities: Due in one year or less $ 141,441 $ 141,396 Due after one year through five years 1,913 1,916 Due after five years through ten years 22,220 21,278 Due after ten years 582,667 536,850 748,241 701,440 MBS: 705,802 703,781 Total $ 1,454,043 $ 1,405,221 March 31, 2024 Amortized Cost Fair Value HELD TO MATURITY Investment securities: Due in one year or less $ 15,973 $ 15,772 Due after one year through five years 5,281 5,198 Due after five years through ten years 142,191 129,856 Due after ten years 1,023,397 892,230 1,186,842 1,043,056 MBS: 120,056 109,130 Total $ 1,306,898 $ 1,152,186 Equity Investments Equity investments on our consolidated balance sheets include Community Reinvestment Act funds with a readily determinable fair value as well as equity investments without readily determinable fair values. At March 31, 2024 and December 31, 2023, we had equity investments recorded in our consolidated balance sheets of $9.6 million and $9.7 million, respectively. Any realized and unrealized gains and losses on equity investments are reported in income. Equity investments without readily determinable fair values are recorded at cost less impairment, if any. For the three months ended March 31, 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 2024 2023 Net gains (losses) recognized during the period on equity investments $ (56) $ 2,500 Less: Net gains recognized during the period on equity investments sold during the period — 2,416 Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date $ (56) $ 84 Equity investments are assessed quarterly for other-than-temporary impairment. Based upon that evaluation, management does not consider any of our equity investments to be other-than-temporarily impaired at March 31, 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 March 31, 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	3 Months Ended
	Mar. 31, 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): March 31, 2024 December 31, 2023 Real estate loans: Construction $ 599,464 $ 789,744 1-4 family residential 720,508 696,738 Commercial 2,413,345 2,168,451 Commercial loans 358,053 366,893 Municipal loans 427,225 441,168 Loans to individuals 58,773 61,516 Total loans 4,577,368 4,524,510 Less: Allowance for loan losses 43,557 42,674 Net loans $ 4,533,811 $ 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 March 31, 2024 consisted of $1.83 billion of owner and non-owner occupied real estate, $551.8 million of loans secured by multi-family properties and $28.0 million of loans secured by farmland. Commercial real estate loans primarily include loans collateralized by retail, commercial office buildings, multi-family residential buildings, medical facilities and offices, senior living, assisted living and skilled nursing facilities, warehouse facilities, hotels and churches. In determining whether to originate commercial real estate loans, we generally consider such factors as the financial condition of the borrower and the debt service coverage of the property. Commercial real estate loans are made at both fixed and adjustable interest rates for terms generally up to 20 years. Commercial Loans Our commercial loans are diversified loan types including short-term working capital loans for inventory and accounts receivable and short- and medium-term loans for equipment or other business capital expansion. In our commercial loan underwriting, we assess the creditworthiness, ability to repay and the value and liquidity of the collateral being offered. Terms of commercial loans are generally commensurate with the useful life of the collateral offered. Municipal Loans We 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 March 31, 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): March 31, 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 $ 8,331 $ 138,169 $ 184,407 $ 64,103 $ 4,649 $ 9,006 $ 160,337 $ 569,002 Pass watch — — 13,912 — 266 — — 14,178 Special mention — — — 180 — 7 — 187 Substandard — — 16,019 65 — — — 16,084 Doubtful — — — — — 13 — 13 Total construction real estate $ 8,331 $ 138,169 $ 214,338 $ 64,348 $ 4,915 $ 9,026 $ 160,337 $ 599,464 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — 1-4 family residential real estate: Pass $ 7,326 $ 44,497 $ 148,117 $ 148,890 $ 112,986 $ 251,106 $ 1,545 $ 714,467 Pass watch — — — — 30 — — 30 Special mention — — — 512 74 — — 586 Substandard — 169 — 71 1,282 3,282 73 4,877 Doubtful — — — — 162 386 — 548 Total 1-4 family residential real estate $ 7,326 $ 44,666 $ 148,117 $ 149,473 $ 114,534 $ 254,774 $ 1,618 $ 720,508 Current period gross charge-offs $ — $ — $ — $ — $ — $ 22 $ — $ 22 Commercial real estate: Pass $ 57,374 $ 472,778 $ 690,253 $ 606,292 $ 173,900 $ 273,284 $ 16,515 $ 2,290,396 Pass watch — — 34,418 — 1,022 472 — 35,912 Special mention 24,541 17,353 1,470 — — 34,443 — 77,807 Substandard — — 853 95 261 6,358 — 7,567 Doubtful — — — — — 1,663 — 1,663 Total commercial real estate $ 81,915 $ 490,131 $ 726,994 $ 606,387 $ 175,183 $ 316,220 $ 16,515 $ 2,413,345 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial loans: Pass $ 18,574 $ 83,955 $ 56,619 $ 37,923 $ 9,421 $ 6,297 $ 139,370 $ 352,159 Pass watch — — 99 101 — 204 — 404 Special mention — 183 169 — 13 147 — 512 Substandard 53 — 3,434 312 — 43 579 4,421 Doubtful — 41 206 253 — 57 — 557 Total commercial loans $ 18,627 $ 84,179 $ 60,527 $ 38,589 $ 9,434 $ 6,748 $ 139,949 $ 358,053 Current period gross charge-offs $ — $ 65 $ 49 $ 37 $ — $ — $ — $ 151 Municipal loans: Pass $ 2,032 $ 38,519 $ 59,855 $ 67,922 $ 48,107 $ 210,790 $ — $ 427,225 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 2,032 $ 38,519 $ 59,855 $ 67,922 $ 48,107 $ 210,790 $ — $ 427,225 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 7,489 $ 18,441 $ 13,054 $ 9,886 $ 5,212 $ 2,557 $ 2,096 $ 58,735 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — 10 — 10 Doubtful — 15 2 — 1 10 — 28 Total loans to individuals $ 7,489 $ 18,456 $ 13,056 $ 9,886 $ 5,213 $ 2,577 $ 2,096 $ 58,773 Current period gross charge-offs (1) $ 427 $ 1 $ 18 $ 2 $ 13 $ — $ — $ 461 Total loans $ 125,720 $ 814,120 $ 1,222,887 $ 936,605 $ 357,386 $ 800,135 $ 320,515 $ 4,577,368 Total current period gross charge-offs (1) $ 427 $ 66 $ 67 $ 39 $ 13 $ 22 $ — $ 634 (1) Includes $306,000 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): March 31, 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 $ 20 $ — $ — $ 20 $ 599,444 $ 599,464 1-4 family residential 4,908 26 2,230 7,164 713,344 720,508 Commercial 1,250 1,781 346 3,377 2,409,968 2,413,345 Commercial loans 1,261 78 165 1,504 356,549 358,053 Municipal loans — — — — 427,225 427,225 Loans to individuals 55 24 — 79 58,694 58,773 Total $ 7,494 $ 1,909 $ 2,741 $ 12,144 $ 4,565,224 $ 4,577,368 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): March 31, 2024 December 31, 2023 Nonaccrual loans: Real estate loans: Construction $ 40 $ 29 1-4 family residential 2,767 2,093 Commercial 2,423 528 Commercial loans 2,451 1,208 Loans to individuals 28 31 Total nonaccrual loans (1) 7,709 3,889 Accruing loans past due more than 90 days — — Restructured loans 151 13 OREO 119 99 Repossessed assets — — Total nonperforming assets $ 7,979 $ 4,001 (1) Includes $535,000 and $506,000 of restructured loans as of March 31, 2024 and December 31, 2023, respectively. The increase in nonaccrual loans was primarily due to one commercial real estate loan and one commercial loan relationship that were put on nonaccrual during the three months ended March 31, 2024. We reversed $34,000 of interest income on nonaccrual loans during the three months ended March 31, 2024, and $26,000 for the three months ended March 31, 2023. We had $939,000 and $1.0 million of loans on nonaccrual for which there was no related allowance for credit losses as of March 31, 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 we have determined that the borrower is experiencing financial difficulty. In such cases, expected credit losses are based on the fair value of the collateral at the measurement date, adjusted for selling costs. As of March 31, 2024 and December 31, 2023, we had $10.6 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 $1.2 million and $1.0 million loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of March 31, 2024 and December 31, 2023, respectively. 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 three months ended March 31, 2024 were not significant. There were no loans restructured during the three months ended March 31, 2024. There were 3 loans totaling $535,000 included in nonperforming assets as of March 31, 2024. There was one commercial loan for $179,000 that was restructured with an extension of amortization period as of March 31, 2023 and is included in our nonaccrual loans in nonperforming assets. On an ongoing basis, the performance of the restructured loans is monitored for subsequent payment default. Payment default is recognized when the borrower is 90 days or more past due. For the three months ended March 31, 2024 and 2023, there were no restructured loans in default. Payment defaults for restructured loans did not significantly impact the determination of the allowance for loan losses in the periods presented. At March 31, 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 March 31, 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 — (22) — (151) — (461) (634) Recoveries of loans charged-off — 11 3 56 — 277 347 Net loans (charged-off) recovered — (11) 3 (95) — (184) (287) Provision for (reversal of) loan losses (367) (61) 624 783 — 191 1,170 Balance at end of period $ 4,920 $ 2,768 $ 32,893 $ 2,774 $ 19 $ 183 $ 43,557 Three Months Ended March 31, 2023 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,164 $ 2,173 $ 28,701 $ 2,235 $ 45 $ 197 $ 36,515 Loans charged-off — (49) — (109) — (475) (633) Recoveries of loans charged-off 1 5 — 60 — 296 362 Net loans (charged-off) recovered 1 (44) — (49) — (179) (271) Provision for (reversal of) loan losses (13) 185 20 (285) (1) 182 88 Balance at end of period $ 3,152 $ 2,314 $ 28,721 $ 1,901 $ 44 $ 200 $ 36,332 The accrued interest receivable on our loan receivables is excluded from the allowance for credit loss estimate and is included in interest receivable on our consolidated balance sheets. As of March 31, 2024 and December 31, 2023, the accrued interest on our loan portfolio was $21.5 million and $21.3 million, respectively.

Borrowing Arrangements

Borrowing Arrangements	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Borrowing Arrangements	Borrowing Arrangements Information related to borrowings is provided in the table below (dollars in thousands): March 31, 2024 December 31, 2023 Other borrowings: Balance at end of period $ 457,685 $ 509,820 Average amount outstanding during the period (1) 229,464 436,676 Maximum amount outstanding during the period (2) 457,685 1,030,421 Weighted average interest rate during the period (3) 5.5 % 4.9 % Interest rate at end of period (4) 5.3 % 5.0 % FHLB borrowings: Balance at end of period $ 312,466 $ 212,648 Average amount outstanding during the period (1) 607,033 276,584 Maximum amount outstanding during the period (2) 702,527 533,242 Weighted average interest rate during the period (3) 3.9 % 2.5 % Interest rate at end of period (5) 3.0 % 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 March 31, 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 $ 453,635 $ 4,050 $ — $ — $ — $ — $ 457,685 FHLB borrowings 310,748 775 391 411 141 — 312,466 Total obligations $ 764,383 $ 4,825 $ 391 $ 411 $ 141 $ — $ 770,151 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 March 31, 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 March 31, 2024, the amount of additional funding the Bank could obtain from the FRDW, collateralized by securities, was approximately $251.9 million. There were $250.0 million in borrowings from the FRDW at March 31, 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 $116.1 million in borrowings from the BTFP at March 31, 2024, with a remaining maturity under one year. Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit, and at March 31, 2024, the line had one outstanding letter of credit for $155,000. Southside Bank currently has no outstanding letters of credit from FHLB held as collateral for its public fund deposits. Southside Bank enters into sales of securities under repurchase agreements. These repurchase agreements totaled $91.6 million at March 31, 2024 and $92.1 million at December 31, 2023, and had maturities of less than 1.4 years. 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	3 Months Ended
	Mar. 31, 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): March 31, 2024 December 31, 2023 Subordinated notes: (1) 3.875% Subordinated notes, net of unamortized debt issuance costs (2) $ 93,913 $ 93,877 Total Subordinated notes 93,913 93,877 Trust preferred subordinated debentures: (3) Southside Statutory Trust III, net of unamortized debt issuance costs (4) 20,579 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 60,271 60,270 Total Long-term debt $ 154,184 $ 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 $1.1 million at March 31, 2024 and 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 $40,000 at March 31, 2024 and $41,000 at December 31, 2023. As of March 31, 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 June 14, 2023, the Company repurchased $5.0 million of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030. (2) 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	3 Months Ended
	Mar. 31, 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 March 31, Retirement Plan Acquired Retirement Plan Restoration Plan 2024 2023 2024 2023 2024 2023 Interest cost $ 910 $ 925 $ 28 $ 32 $ 203 $ 206 Expected return on assets (1,215) (1,143) (46) (47) — — Net loss amortization 149 166 — — 18 7 Net periodic benefit cost (income) $ (156) $ (52) $ (18) $ (15) $ 221 $ 213 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 $167,000 and $173,000 for the three months ended March 31, 2024 and 2023, respectively.

Derivative Financial Instrument

Derivative Financial Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2024
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 $940 billion 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 second quarter of 2023, we terminated one interest rate swap contract designated as a cash flow hedge. At the time of termination, we determined the underlying hedged forecasted transactions were still probable of occurring. The existing loss in AOCI will be reclassified into earnings in the same periods the hedged forecasted transaction affects earnings. Fair Value Hedges Gains and losses on derivative instruments designated as fair value hedges, as well as the change in fair value on the hedged item, are recorded in interest income in the consolidated statements of income. Gains and losses due to changes in fair value of the interest rate swap agreements completely offset changes in the fair value of the hedged portion of the hedged item. During 2022, we entered into partial term fair value hedges, as allowed under ASU 2017-12, for certain of our fixed rate callable AFS municipal securities. The instruments are designated as fair value hedges as the changes in the fair value of the interest rate swap are expected to offset changes in the fair value of the hedged item attributable to changes in the SOFR swap rate, the designated benchmark interest rate. As of March 31, 2024, hedged securities with a carrying amount of $449.4 million are included in our AFS securities portfolio in our consolidated balance sheets. These derivative contracts involve the receipt of floating rate interest from a counterparty in exchange for us making fixed-rate payments over the life of the agreement, without the exchange of the underlying notional value. During 2023, we terminated some of our fair value hedging relationships and sold the hedged items. As a result of the sale, the cumulative adjustments to the carrying amount was a fair value net gain of $6.5 million recognized in earnings and recorded in noninterest income during the year ended December 31, 2023. The following table presents the amounts recorded in the consolidated balance sheets related to the cumulative adjustments for fair value hedges (in thousands): March 31, 2024 December 31, 2023 Amortized cost of hedged assets - Securities AFS $ 485,979 $ 487,486 Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 20,422 13,642 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 March 31, 2024 and December 31, 2023, net derivative assets included $65.4 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): March 31, 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 $ 940,000 $ 26,043 $ 1,824 $ 1,010,000 $ 24,223 $ 6,910 Swaps-Fair Value Hedge-Financial institution counterparties 453,440 20,422 — 453,440 13,658 16 Derivatives designated as non-hedging instruments Interest rate contracts: Swaps-Financial institution counterparties 245,874 21,786 27 248,073 18,249 509 Swaps-Customer counterparties 245,874 27 21,786 248,073 509 18,249 Gross derivatives 68,278 23,637 56,639 25,684 Offsetting derivative assets/liabilities (1,851) (1,851) (7,435) (7,435) Cash collateral received/posted (65,360) — (46,760) — Net derivatives included in the consolidated balance sheets (2) $ 1,067 $ 21,786 $ 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 March 31, 2024, we had $1.0 million credit exposure related to interest rate swaps with financial institutions and $27,000 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 March 31, 2024 and December 31, 2023: March 31, 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 $ 940,000 2.3 5.40 % 2.94 % $ 1,010,000 2.3 5.44 % 2.65 % Swaps-Fair Value hedge Financial institution counterparties 453,440 5.1 5.34 % 3.13 % 453,440 5.4 5.37 % 3.13 % Swaps-Non-hedging Financial institution counterparties 245,874 7.2 5.81 % 2.87 % 248,073 7.4 5.84 % 2.88 % Customer counterparties 245,874 7.2 2.87 % 5.81 % 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 March 31, 2024 2023 Derivatives designated as hedging instruments Swaps-Cash Flow hedge Gain (loss) included in interest expense on deposits $ 4,111 $ 3,071 Gain (loss) included in interest expense on FHLB borrowings 2,531 1,901 Gain (loss) included in interest expense on other borrowings — 136 6,642 5,108 Swaps-Fair Value hedge Gain (loss) included in interest income on tax-exempt investment securities 2,622 2,450 Derivatives designated as non-hedging instruments Swaps-Non-hedging Other noninterest income — 160

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 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 March 31, 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 March 31, 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 March 31, 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 $ 139,186 $ 139,186 $ — $ — State and political subdivisions 548,545 — 548,545 — Corporate bonds and other 13,709 — 13,709 — MBS: (1) Residential 699,077 — 699,077 — Commercial 4,704 — 4,704 — Equity investments: Equity investments 5,252 5,252 — — Derivative assets: Interest rate swaps 68,278 — 68,278 — Total asset recurring fair value measurements $ 1,478,751 $ 144,438 $ 1,334,313 $ — Derivative liabilities: Interest rate swaps $ 23,637 $ — $ 23,637 $ — Total liability recurring fair value measurements $ 23,637 $ — $ 23,637 $ — Nonrecurring fair value measurements Foreclosed assets $ 119 $ — $ — $ 119 Collateral-dependent loans (2) 9,660 — — 9,660 Total asset nonrecurring fair value measurements $ 9,779 $ — $ — $ 9,779 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 March 31, 2024 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 469,373 $ 469,373 $ 469,373 $ — $ — Investment securities: HTM, at carrying value 1,186,842 1,043,056 — 1,043,056 — MBS: HTM, at carrying value 120,056 109,130 — 109,130 — FHLB stock, at cost 27,958 27,958 — 27,958 — Equity investments 4,302 4,302 — 4,302 — Loans, net of allowance for loan losses 4,533,811 4,228,531 — — 4,228,531 Loans held for sale 756 756 — 756 — Financial liabilities: Deposits $ 6,545,760 $ 6,523,686 $ — $ 6,523,686 $ — Other borrowings 457,685 458,750 — 458,750 — FHLB borrowings 312,466 303,076 — 303,076 — Subordinated notes, net of unamortized debt issuance costs 93,913 87,292 — 87,292 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,271 57,168 — 57,168 — 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	3 Months Ended
	Mar. 31, 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 2024 2023 Current income tax expense $ 4,764 $ 4,737 Deferred income tax expense (benefit) (142) (194) Income tax expense $ 4,622 $ 4,543 The net deferred tax asset totaled $29.9 million at March 31, 2024 as compared to $30.4 million at December 31, 2023. The slight decrease in the net deferred tax asset is primarily the result of an increase in the estimated fair value of the effective hedging derivatives. No valuation allowance was recorded at March 31, 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 March 31, 2024 or December 31, 2023.

Off-Balance-Sheet Arrangements,

Off-Balance-Sheet Arrangements, Commitments and Contingencies	3 Months Ended
	Mar. 31, 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 2024 2023 Balance at beginning of period $ 3,932 $ 3,687 Provision for (reversal of) off-balance-sheet credit exposures (1,112) (128) Balance at end of period $ 2,820 $ 3,559 Contractual commitments to extend credit are agreements to lend to a customer provided the terms established in the contract are met. Commitments to extend credit generally have fixed expiration dates and may require the payment of fees. Since some commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in commitments to extend credit and similarly do not necessarily represent future cash obligations. Financial instruments with off-balance-sheet risk were as follows (in thousands): March 31, 2024 December 31, 2023 Commitments to extend credit $ 999,493 $ 1,082,327 Standby letters of credit 12,385 10,823 Total $ 1,011,878 $ 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 $372,000 and $192,000 operating lease ROU assets obtained in exchange for new operating lease liabilities during the three months ended March 31, 2024 and 2023, respectively. Securities . In the normal course of business we buy and sell securities. At March 31, 2024, there were $7.2 million unsettled trades to purchase securities and $6.4 million 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 March 31, 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
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net income	$ 21,511	$ 26,034

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 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)	3 Months Ended
	Mar. 31, 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 (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 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 2024 2023 Basic and Diluted Earnings: Net income $ 21,511 $ 26,034 Basic weighted-average shares outstanding 30,262 31,372 Add: Stock awards 43 92 Diluted weighted-average shares outstanding 30,305 31,464 Basic earnings per share: Net income $ 0.71 $ 0.83 Diluted earnings per share: Net income $ 0.71 $ 0.83

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 income (loss) before reclassifications (5,887) 13,616 — 7,729 Reclassification adjustments included in net income 2,041 (6,642) 167 (4,434) Income tax (expense) benefit 807 (1,465) (34) (692) Net current-period other comprehensive income (loss), net of tax (3,039) 5,509 133 2,603 Ending balance, net of tax $ (110,538) $ 18,312 $ (18,633) $ (110,859) Three Months Ended March 31, 2023 Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Retirement Plans Total Beginning balance, net of tax $ (149,181) $ 31,227 $ (19,502) $ (137,456) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications 13,019 (6,976) — 6,043 Reclassification adjustments included in net income 4,138 (5,108) 173 (797) Income tax (expense) benefit (3,603) 2,537 (36) (1,102) Net current-period other comprehensive income (loss), net of tax 13,554 (9,547) 137 4,144 Ending balance, net of tax $ (135,627) $ 21,680 $ (19,365) $ (133,312)
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 2024 2023 Unrealized gains and losses on securities transferred: Amortization of unrealized gains and losses (1) $ (2,023) $ (1,992) Tax benefit 425 418 Net of tax (1,598) (1,574) Unrealized gains and losses on available for sale securities: Realized net gain (loss) on sale of securities (2) (18) (2,146) Tax (expense) benefit 4 451 Net of tax (14) (1,695) Derivatives: Realized net gain (loss) on interest rate swap derivatives (3) 6,642 5,108 Tax benefit (1,395) (1,072) Net of tax 5,247 4,036 Amortization of pension plan: Net actuarial loss (4) (167) (173) Tax benefit 34 36 Net of tax (133) (137) Total reclassifications for the period, net of tax $ 3,502 $ 630 (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)	3 Months Ended
	Mar. 31, 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 March 31, 2024 and December 31, 2023 are reflected in the tables below (in thousands): March 31, 2024 Amortized Gross Unrealized Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Fair Value Investment securities: U.S. Treasury $ 139,205 $ — $ 19 $ 139,186 State and political subdivisions 594,449 126 46,030 548,545 Corporate bonds and other 14,587 37 915 13,709 MBS: (1) Residential 700,572 2,613 4,108 699,077 Commercial 5,230 30 556 4,704 Total $ 1,454,043 $ 2,806 $ 51,628 $ 1,405,221 HELD TO MATURITY Investment securities: State and political subdivisions $ 1,039,958 $ 6,658 $ 138,034 $ 908,582 Corporate bonds and other 146,884 437 12,847 134,474 MBS: (1) Residential 89,952 9 8,578 81,383 Commercial 30,104 — 2,357 27,747 Total $ 1,306,898 $ 7,104 $ 161,816 $ 1,152,186 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 March 31, 2024 and December 31, 2023, segregated by major security type and length of time in a continuous loss position (in thousands): March 31, 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: U.S. Treasury $ 139,186 $ 19 $ — $ — $ 139,186 $ 19 State and political subdivisions 7,464 73 524,101 45,957 531,565 46,030 Corporate bonds and other 3,450 108 9,332 807 12,782 915 MBS: Residential 249,034 980 35,223 3,128 284,257 4,108 Commercial — — 2,455 556 2,455 556 Total $ 399,134 $ 1,180 $ 571,111 $ 50,448 $ 970,245 $ 51,628 HELD TO MATURITY Investment securities: State and political subdivisions $ 35,016 $ 563 $ 711,680 $ 137,471 $ 746,696 $ 138,034 Corporate bonds and other 2,714 125 126,059 12,722 128,773 12,847 MBS: Residential — — 80,792 8,578 80,792 8,578 Commercial — — 27,747 2,357 27,747 2,357 Total $ 37,730 $ 688 $ 946,278 $ 161,128 $ 984,008 $ 161,816 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 $ 2,023 $ 697 State and political subdivisions 14,269 17,099 Corporate bonds and other 1,763 1,832 MBS 10,119 4,329 Total interest income on securities $ 28,174 $ 23,957
Amortized cost, carrying value and fair value of securities presented by contractual maturity	The amortized cost and estimated fair value of AFS and HTM securities at March 31, 2024, are presented below by contractual maturity (in thousands): March 31, 2024 Amortized Cost Fair Value AVAILABLE FOR SALE Investment securities: Due in one year or less $ 141,441 $ 141,396 Due after one year through five years 1,913 1,916 Due after five years through ten years 22,220 21,278 Due after ten years 582,667 536,850 748,241 701,440 MBS: 705,802 703,781 Total $ 1,454,043 $ 1,405,221 March 31, 2024 Amortized Cost Fair Value HELD TO MATURITY Investment securities: Due in one year or less $ 15,973 $ 15,772 Due after one year through five years 5,281 5,198 Due after five years through ten years 142,191 129,856 Due after ten years 1,023,397 892,230 1,186,842 1,043,056 MBS: 120,056 109,130 Total $ 1,306,898 $ 1,152,186
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 2024 2023 Net gains (losses) recognized during the period on equity investments $ (56) $ 2,500 Less: Net gains recognized during the period on equity investments sold during the period — 2,416 Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date $ (56) $ 84

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Loans by Portfolio Segment	Loans in the accompanying consolidated balance sheets are classified as follows (in thousands): March 31, 2024 December 31, 2023 Real estate loans: Construction $ 599,464 $ 789,744 1-4 family residential 720,508 696,738 Commercial 2,413,345 2,168,451 Commercial loans 358,053 366,893 Municipal loans 427,225 441,168 Loans to individuals 58,773 61,516 Total loans 4,577,368 4,524,510 Less: Allowance for loan losses 43,557 42,674 Net loans $ 4,533,811 $ 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): March 31, 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 $ 8,331 $ 138,169 $ 184,407 $ 64,103 $ 4,649 $ 9,006 $ 160,337 $ 569,002 Pass watch — — 13,912 — 266 — — 14,178 Special mention — — — 180 — 7 — 187 Substandard — — 16,019 65 — — — 16,084 Doubtful — — — — — 13 — 13 Total construction real estate $ 8,331 $ 138,169 $ 214,338 $ 64,348 $ 4,915 $ 9,026 $ 160,337 $ 599,464 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — 1-4 family residential real estate: Pass $ 7,326 $ 44,497 $ 148,117 $ 148,890 $ 112,986 $ 251,106 $ 1,545 $ 714,467 Pass watch — — — — 30 — — 30 Special mention — — — 512 74 — — 586 Substandard — 169 — 71 1,282 3,282 73 4,877 Doubtful — — — — 162 386 — 548 Total 1-4 family residential real estate $ 7,326 $ 44,666 $ 148,117 $ 149,473 $ 114,534 $ 254,774 $ 1,618 $ 720,508 Current period gross charge-offs $ — $ — $ — $ — $ — $ 22 $ — $ 22 Commercial real estate: Pass $ 57,374 $ 472,778 $ 690,253 $ 606,292 $ 173,900 $ 273,284 $ 16,515 $ 2,290,396 Pass watch — — 34,418 — 1,022 472 — 35,912 Special mention 24,541 17,353 1,470 — — 34,443 — 77,807 Substandard — — 853 95 261 6,358 — 7,567 Doubtful — — — — — 1,663 — 1,663 Total commercial real estate $ 81,915 $ 490,131 $ 726,994 $ 606,387 $ 175,183 $ 316,220 $ 16,515 $ 2,413,345 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial loans: Pass $ 18,574 $ 83,955 $ 56,619 $ 37,923 $ 9,421 $ 6,297 $ 139,370 $ 352,159 Pass watch — — 99 101 — 204 — 404 Special mention — 183 169 — 13 147 — 512 Substandard 53 — 3,434 312 — 43 579 4,421 Doubtful — 41 206 253 — 57 — 557 Total commercial loans $ 18,627 $ 84,179 $ 60,527 $ 38,589 $ 9,434 $ 6,748 $ 139,949 $ 358,053 Current period gross charge-offs $ — $ 65 $ 49 $ 37 $ — $ — $ — $ 151 Municipal loans: Pass $ 2,032 $ 38,519 $ 59,855 $ 67,922 $ 48,107 $ 210,790 $ — $ 427,225 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total municipal loans $ 2,032 $ 38,519 $ 59,855 $ 67,922 $ 48,107 $ 210,790 $ — $ 427,225 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Loans to individuals: Pass $ 7,489 $ 18,441 $ 13,054 $ 9,886 $ 5,212 $ 2,557 $ 2,096 $ 58,735 Pass watch — — — — — — — — Special mention — — — — — — — — Substandard — — — — — 10 — 10 Doubtful — 15 2 — 1 10 — 28 Total loans to individuals $ 7,489 $ 18,456 $ 13,056 $ 9,886 $ 5,213 $ 2,577 $ 2,096 $ 58,773 Current period gross charge-offs (1) $ 427 $ 1 $ 18 $ 2 $ 13 $ — $ — $ 461 Total loans $ 125,720 $ 814,120 $ 1,222,887 $ 936,605 $ 357,386 $ 800,135 $ 320,515 $ 4,577,368 Total current period gross charge-offs (1) $ 427 $ 66 $ 67 $ 39 $ 13 $ 22 $ — $ 634 (1) Includes $306,000 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): March 31, 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 $ 20 $ — $ — $ 20 $ 599,444 $ 599,464 1-4 family residential 4,908 26 2,230 7,164 713,344 720,508 Commercial 1,250 1,781 346 3,377 2,409,968 2,413,345 Commercial loans 1,261 78 165 1,504 356,549 358,053 Municipal loans — — — — 427,225 427,225 Loans to individuals 55 24 — 79 58,694 58,773 Total $ 7,494 $ 1,909 $ 2,741 $ 12,144 $ 4,565,224 $ 4,577,368 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): March 31, 2024 December 31, 2023 Nonaccrual loans: Real estate loans: Construction $ 40 $ 29 1-4 family residential 2,767 2,093 Commercial 2,423 528 Commercial loans 2,451 1,208 Loans to individuals 28 31 Total nonaccrual loans (1) 7,709 3,889 Accruing loans past due more than 90 days — — Restructured loans 151 13 OREO 119 99 Repossessed assets — — Total nonperforming assets $ 7,979 $ 4,001 (1) Includes $535,000 and $506,000 of restructured loans as of March 31, 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 March 31, 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 — (22) — (151) — (461) (634) Recoveries of loans charged-off — 11 3 56 — 277 347 Net loans (charged-off) recovered — (11) 3 (95) — (184) (287) Provision for (reversal of) loan losses (367) (61) 624 783 — 191 1,170 Balance at end of period $ 4,920 $ 2,768 $ 32,893 $ 2,774 $ 19 $ 183 $ 43,557 Three Months Ended March 31, 2023 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 3,164 $ 2,173 $ 28,701 $ 2,235 $ 45 $ 197 $ 36,515 Loans charged-off — (49) — (109) — (475) (633) Recoveries of loans charged-off 1 5 — 60 — 296 362 Net loans (charged-off) recovered 1 (44) — (49) — (179) (271) Provision for (reversal of) loan losses (13) 185 20 (285) (1) 182 88 Balance at end of period $ 3,152 $ 2,314 $ 28,721 $ 1,901 $ 44 $ 200 $ 36,332

Borrowing Arrangements (Tables)

Borrowing Arrangements (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Debt	Information related to borrowings is provided in the table below (dollars in thousands): March 31, 2024 December 31, 2023 Other borrowings: Balance at end of period $ 457,685 $ 509,820 Average amount outstanding during the period (1) 229,464 436,676 Maximum amount outstanding during the period (2) 457,685 1,030,421 Weighted average interest rate during the period (3) 5.5 % 4.9 % Interest rate at end of period (4) 5.3 % 5.0 % FHLB borrowings: Balance at end of period $ 312,466 $ 212,648 Average amount outstanding during the period (1) 607,033 276,584 Maximum amount outstanding during the period (2) 702,527 533,242 Weighted average interest rate during the period (3) 3.9 % 2.5 % Interest rate at end of period (5) 3.0 % 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 March 31, 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 $ 453,635 $ 4,050 $ — $ — $ — $ — $ 457,685 FHLB borrowings 310,748 775 391 411 141 — 312,466 Total obligations $ 764,383 $ 4,825 $ 391 $ 411 $ 141 $ — $ 770,151

Long-term Debt (Tables)

Long-term Debt (Tables)	3 Months Ended
	Mar. 31, 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): March 31, 2024 December 31, 2023 Subordinated notes: (1) 3.875% Subordinated notes, net of unamortized debt issuance costs (2) $ 93,913 $ 93,877 Total Subordinated notes 93,913 93,877 Trust preferred subordinated debentures: (3) Southside Statutory Trust III, net of unamortized debt issuance costs (4) 20,579 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 60,271 60,270 Total Long-term debt $ 154,184 $ 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 $1.1 million at March 31, 2024 and 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 March 31, 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 June 14, 2023, the Company repurchased $5.0 million of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030. (2) 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)	3 Months Ended
	Mar. 31, 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 March 31, Retirement Plan Acquired Retirement Plan Restoration Plan 2024 2023 2024 2023 2024 2023 Interest cost $ 910 $ 925 $ 28 $ 32 $ 203 $ 206 Expected return on assets (1,215) (1,143) (46) (47) — — Net loss amortization 149 166 — — 18 7 Net periodic benefit cost (income) $ (156) $ (52) $ (18) $ (15) $ 221 $ 213

Derivative Financial Instrume_2

Derivative Financial Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 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): March 31, 2024 December 31, 2023 Amortized cost of hedged assets - Securities AFS $ 485,979 $ 487,486 Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 20,422 13,642
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following tables present the notional and estimated fair value amount of derivative positions outstanding (in thousands): March 31, 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 $ 940,000 $ 26,043 $ 1,824 $ 1,010,000 $ 24,223 $ 6,910 Swaps-Fair Value Hedge-Financial institution counterparties 453,440 20,422 — 453,440 13,658 16 Derivatives designated as non-hedging instruments Interest rate contracts: Swaps-Financial institution counterparties 245,874 21,786 27 248,073 18,249 509 Swaps-Customer counterparties 245,874 27 21,786 248,073 509 18,249 Gross derivatives 68,278 23,637 56,639 25,684 Offsetting derivative assets/liabilities (1,851) (1,851) (7,435) (7,435) Cash collateral received/posted (65,360) — (46,760) — Net derivatives included in the consolidated balance sheets (2) $ 1,067 $ 21,786 $ 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 March 31, 2024 and December 31, 2023: March 31, 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 $ 940,000 2.3 5.40 % 2.94 % $ 1,010,000 2.3 5.44 % 2.65 % Swaps-Fair Value hedge Financial institution counterparties 453,440 5.1 5.34 % 3.13 % 453,440 5.4 5.37 % 3.13 % Swaps-Non-hedging Financial institution counterparties 245,874 7.2 5.81 % 2.87 % 248,073 7.4 5.84 % 2.88 % Customer counterparties 245,874 7.2 2.87 % 5.81 % 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 March 31, 2024 2023 Derivatives designated as hedging instruments Swaps-Cash Flow hedge Gain (loss) included in interest expense on deposits $ 4,111 $ 3,071 Gain (loss) included in interest expense on FHLB borrowings 2,531 1,901 Gain (loss) included in interest expense on other borrowings — 136 6,642 5,108 Swaps-Fair Value hedge Gain (loss) included in interest income on tax-exempt investment securities 2,622 2,450 Derivatives designated as non-hedging instruments Swaps-Non-hedging Other noninterest income — 160

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 139,186 $ 139,186 $ — $ — State and political subdivisions 548,545 — 548,545 — Corporate bonds and other 13,709 — 13,709 — MBS: (1) Residential 699,077 — 699,077 — Commercial 4,704 — 4,704 — Equity investments: Equity investments 5,252 5,252 — — Derivative assets: Interest rate swaps 68,278 — 68,278 — Total asset recurring fair value measurements $ 1,478,751 $ 144,438 $ 1,334,313 $ — Derivative liabilities: Interest rate swaps $ 23,637 $ — $ 23,637 $ — Total liability recurring fair value measurements $ 23,637 $ — $ 23,637 $ — Nonrecurring fair value measurements Foreclosed assets $ 119 $ — $ — $ 119 Collateral-dependent loans (2) 9,660 — — 9,660 Total asset nonrecurring fair value measurements $ 9,779 $ — $ — $ 9,779 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 March 31, 2024 Carrying Total Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 469,373 $ 469,373 $ 469,373 $ — $ — Investment securities: HTM, at carrying value 1,186,842 1,043,056 — 1,043,056 — MBS: HTM, at carrying value 120,056 109,130 — 109,130 — FHLB stock, at cost 27,958 27,958 — 27,958 — Equity investments 4,302 4,302 — 4,302 — Loans, net of allowance for loan losses 4,533,811 4,228,531 — — 4,228,531 Loans held for sale 756 756 — 756 — Financial liabilities: Deposits $ 6,545,760 $ 6,523,686 $ — $ 6,523,686 $ — Other borrowings 457,685 458,750 — 458,750 — FHLB borrowings 312,466 303,076 — 303,076 — Subordinated notes, net of unamortized debt issuance costs 93,913 87,292 — 87,292 — Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,271 57,168 — 57,168 — 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)	3 Months Ended
	Mar. 31, 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 2024 2023 Current income tax expense $ 4,764 $ 4,737 Deferred income tax expense (benefit) (142) (194) Income tax expense $ 4,622 $ 4,543

Off-Balance-Sheet Arrangement_2

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 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 2024 2023 Balance at beginning of period $ 3,932 $ 3,687 Provision for (reversal of) off-balance-sheet credit exposures (1,112) (128) Balance at end of period $ 2,820 $ 3,559
Schedule of unused commitments	Financial instruments with off-balance-sheet risk were as follows (in thousands): March 31, 2024 December 31, 2023 Commitments to extend credit $ 999,493 $ 1,082,327 Standby letters of credit 12,385 10,823 Total $ 1,011,878 $ 1,093,150

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Basic and Diluted Earnings:
Net income	$ 21,511	$ 26,034
Basic weighted-average shares outstanding (in shares)	30,262	31,372
Add: Stock awards (in shares)	43	92
Diluted weighted-average shares outstanding (in shares)	30,305	31,464
Basic earnings per share:
Earnings per common share - basic (in dollars per share)	$ 0.71	$ 0.83
Diluted earnings per share:
Earnings per common share - diluted (in dollars per share)	$ 0.71	$ 0.83
Number of antidilutive shares (in shares)	630	121

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	$ 773,288	$ 745,997
Income tax (expense) benefit	(692)	(1,102)
Ending balance, net of tax	787,922	751,030
Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(107,499)	(149,181)
Other comprehensive (loss) income before reclassifications	(5,887)	13,019
Reclassification adjustments included in net income	2,041	4,138
Income tax (expense) benefit	807	(3,603)
Net current-period other comprehensive income (loss), net of tax	(3,039)	13,554
Ending balance, net of tax	(110,538)	(135,627)
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	12,803	31,227
Other comprehensive (loss) income before reclassifications	13,616	(6,976)
Reclassification adjustments included in net income	(6,642)	(5,108)
Income tax (expense) benefit	(1,465)	2,537
Net current-period other comprehensive income (loss), net of tax	5,509	(9,547)
Ending balance, net of tax	18,312	21,680
Retirement Plans
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(18,766)	(19,502)
Other comprehensive (loss) income before reclassifications	0	0
Reclassification adjustments included in net income	167	173
Income tax (expense) benefit	(34)	(36)
Net current-period other comprehensive income (loss), net of tax	133	137
Ending balance, net of tax	(18,633)	(19,365)
Total
AOCI Attributable to Parent, Net of Tax
Beginning balance, net of tax	(113,462)	(137,456)
Other comprehensive (loss) income before reclassifications	7,729	6,043
Reclassification adjustments included in net income	(4,434)	(797)
Income tax (expense) benefit	(692)	(1,102)
Net current-period other comprehensive income (loss), net of tax	2,603	4,144
Ending balance, net of tax	$ (110,859)	$ (133,312)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized gains and losses		$ 2,023	$ 1,992
Tax benefit (expense)		(4,622)	(4,543)
Realized net gain (loss) on sale of securities		(18)	(2,146)
Total reclassifications for the period, net of tax		3,502	630
Unrealized gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(2,041)	(4,138)
Realized net gain (loss) on interest rate swap derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		6,642	5,108
Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income	[1]	(167)	(173)
Amortization of pension plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from accumulated other comprehensive income		(167)	(173)
Tax benefit		34	36
Total reclassifications for the period, net of tax		(133)	(137)
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]	(2,023)	(1,992)
Tax benefit (expense)		425	418
Net of tax		(1,598)	(1,574)
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)		4	451
Net of tax		(14)	(1,695)
Realized net gain (loss) on sale of securities	[3]	(18)	(2,146)
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)		(1,395)	(1,072)
Net of tax		5,247	4,036
Realized net (loss) gain on interest rate swap derivatives	[4]	$ 6,642	$ 5,108
[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		Mar. 31, 2024	Dec. 31, 2023
Available-for-sale [Abstract]
Amortized Cost		$ 1,454,043	$ 1,332,467
Gross unrealized gains		2,806	3,658
Gross unrealized losses		51,628	39,831
Securities AFS, at estimated fair value		1,405,221	1,296,294
HELD TO MATURITY
Amortized cost		1,306,898	1,307,053
Gross unrealized gains		7,104	10,571
Gross unrealized losses		161,816	151,462
Estimated Fair Value		1,152,186	1,166,162
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		139,205	139,706
Gross unrealized gains		0	19
Gross unrealized losses		19	0
Securities AFS, at estimated fair value		139,186	139,725
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		594,449	603,913
Gross unrealized gains		126	362
Gross unrealized losses		46,030	35,530
Securities AFS, at estimated fair value		548,545	568,745
HELD TO MATURITY
Amortized cost		1,039,958	1,039,440
Gross unrealized gains		6,658	10,070
Gross unrealized losses		138,034	126,233
Estimated Fair Value		908,582	923,277
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,587	14,569
Gross unrealized gains		37	31
Gross unrealized losses		915	507
Securities AFS, at estimated fair value		13,709	14,093
HELD TO MATURITY
Amortized cost		146,884	146,712
Gross unrealized gains		437	488
Gross unrealized losses		12,847	15,738
Estimated Fair Value		134,474	131,462
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	700,572	569,039
Gross unrealized gains	[1]	2,613	3,202
Gross unrealized losses	[1]	4,108	3,258
Securities AFS, at estimated fair value	[1]	699,077	568,983
HELD TO MATURITY
Amortized cost	[1]	89,952	90,619
Gross unrealized gains	[1]	9	13
Gross unrealized losses	[1]	8,578	7,263
Estimated Fair Value	[1]	81,383	83,369
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	5,230	5,240
Gross unrealized gains	[1]	30	44
Gross unrealized losses	[1]	556	536
Securities AFS, at estimated fair value	[1]	4,704	4,748
HELD TO MATURITY
Amortized cost	[1]	30,104	30,282
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	2,357	2,228
Estimated Fair Value	[1]	$ 27,747	$ 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	Mar. 31, 2024	Dec. 31, 2023
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 399,134	$ 185,339
Less than 12 Months, unrealized loss	1,180	1,165
More than 12 Months, fair value	571,111	560,939
More than 12 Months, unrealized Loss	50,448	38,666
Total fair value	970,245	746,278
Total unrealized loss	51,628	39,831
HELD TO MATURITY
Less than 12 months, fair value	37,730	26,505
Less than 12 months, unrealized loss	688	1,258
More than 12 months, fair value	946,278	939,087
More than 12 months, unrealized loss	161,128	150,204
Total fair value	984,008	965,592
Total unrealized loss	161,816	151,462
US Treasury Securities
AVAILABLE FOR SALE
Less than 12 Months, fair value	139,186
Less than 12 Months, unrealized loss	19
More than 12 Months, fair value	0
More than 12 Months, unrealized Loss	0
Total fair value	139,186
Total unrealized loss	19
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	7,464	26,371
Less than 12 Months, unrealized loss	73	297
More than 12 Months, fair value	524,101	516,520
More than 12 Months, unrealized Loss	45,957	35,233
Total fair value	531,565	542,891
Total unrealized loss	46,030	35,530
HELD TO MATURITY
Less than 12 months, fair value	35,016	16,549
Less than 12 months, unrealized loss	563	123
More than 12 months, fair value	711,680	713,499
More than 12 months, unrealized loss	137,471	126,110
Total fair value	746,696	730,048
Total unrealized loss	138,034	126,233
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	3,450	8,103
Less than 12 Months, unrealized loss	108	319
More than 12 Months, fair value	9,332	5,071
More than 12 Months, unrealized Loss	807	188
Total fair value	12,782	13,174
Total unrealized loss	915	507
HELD TO MATURITY
Less than 12 months, fair value	2,714	9,956
Less than 12 months, unrealized loss	125	1,135
More than 12 months, fair value	126,059	114,787
More than 12 months, unrealized loss	12,722	14,603
Total fair value	128,773	124,743
Total unrealized loss	12,847	15,738
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	249,034	150,865
Less than 12 Months, unrealized loss	980	549
More than 12 Months, fair value	35,223	36,864
More than 12 Months, unrealized Loss	3,128	2,709
Total fair value	284,257	187,729
Total unrealized loss	4,108	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	80,792	82,747
More than 12 months, unrealized loss	8,578	7,263
Total fair value	80,792	82,747
Total unrealized loss	8,578	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	2,455	2,484
More than 12 Months, unrealized Loss	556	536
Total fair value	2,455	2,484
Total unrealized loss	556	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	27,747	28,054
More than 12 months, unrealized loss	2,357	2,228
Total fair value	27,747	28,054
Total unrealized loss	$ 2,357	$ 2,228

Securities - Interest Income on

Securities - Interest Income on Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments, Debt Securities [Abstract]
US Treasury	$ 2,023	$ 697
State and political subdivisions	14,269	17,099
Corporate bonds and other	1,763	1,832
MBS	10,119	4,329
Total interest income on securities	$ 28,174	$ 23,957

Securities - Amortized Cost and

Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available for sale, Amortized Cost
Due in one year or less	$ 141,441
Due after one year through five years	1,913
Due after five years through ten years	22,220
Due after ten years	582,667
Total available-for-sale investment securities	748,241
MBS:	705,802
Amortized Cost	1,454,043	$ 1,332,467
Available for sale, Fair Value
Due in one year or less	141,396
Due after one year through five years	1,916
Due after five years through ten years	21,278
Due after ten years	536,850
Total available-for-sale investment securities	701,440
MBS:	703,781
Total	1,405,221	1,296,294
Held to maturity, Amortized Cost
Due in one year or less	15,973
Due after one year through five years	5,281
Due after five years through ten years	142,191
Due after ten years	1,023,397
Total held-to-maturity investment securities	1,186,842
Mortgage-backed securities	120,056
Amortized cost	1,306,898	1,307,053
Held to maturity, Fair Value
Due in one year or less	15,772
Due after one year through five years	5,198
Due after five years through ten years	129,856
Due after ten years	892,230
Total held-to-maturity investment securities	1,043,056
Mortgage-backed securities	109,130
Total	$ 1,152,186	$ 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
	Mar. 31, 2024	Mar. 31, 2023
Investments, All Other Investments [Abstract]
Net gains (losses) recognized during the period on equity investments	$ (56)	$ 2,500
Less: Net gains recognized during the period on equity investments sold during the period	0	2,416
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date	$ (56)	$ 84

Securities - Narrative (Details

Securities - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) debt_security bonds	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0		$ 0
Transferred Securities, Unrealized Loss, Before Tax	111,500,000		113,500,000
Securities transferred, Unrealized Loss, Net of Tax	88,100,000		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	(18,000)	$ (2,146,000)
Gross realized gains on AFS securities	61,000	3,300,000
Gross realized losses on AFS securities	79,000	1,100,000
Equity investments	9,554,000		9,691,000
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Sale of HTM portfolio	0	0
Interest receivable	39,716,000		50,489,000
FHLB stock with other-than-temporary impairment	0
Other-than-temporarily impaired equity investments	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | debt_security	396
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 469,373,000	310,492,000	560,510,000	$ 199,252,000
Less: Net gains recognized during the period on equity investments sold during the period	0	2,416,000
Debt Securities, Available-for-Sale, Accrued Interest	9,800,000		15,400,000
Debt Securities, Held-to-Maturity, Accrued Interest	$ 8,400,000		13,700,000
Held-To-Maturity Securities, Number Of Bonds Below Investment Grade | bonds	3
State and political subdivisions
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)	$ 0	0
Corporate bonds and other
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)	0	$ 0
Asset Pledged as Collateral
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities	2,310,000,000		2,280,000,000
Asset Pledged As Collateral, Excess Amount
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]
Debt Securities	251,900,000		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

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Abstract]
Loans	$ 4,577,368	$ 4,524,510
Less: Allowance for loan losses	43,557	42,674	$ 36,332	$ 36,515
Total loans	4,533,811	4,481,836
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	599,464	789,744
Less: Allowance for loan losses	4,920	5,287	3,152	3,164
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	720,508	696,738
Less: Allowance for loan losses	2,768	2,840	2,314	2,173
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	2,413,345	2,168,451
Less: Allowance for loan losses	32,893	32,266	28,721	28,701
Commercial loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	358,053	366,893
Less: Allowance for loan losses	2,774	2,086	1,901	2,235
Municipal loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	427,225	441,168
Less: Allowance for loan losses	19	19	44	45
Loans to individuals
Loans and Leases Receivable Disclosure [Abstract]
Loans	58,773	61,516
Less: Allowance for loan losses	$ 183	$ 176	$ 200	$ 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			12 Months Ended
	Mar. 31, 2024		Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 125,720			$ 839,785
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	814,120			1,199,738
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,222,887			961,538
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	936,605			365,469
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	357,386			217,076
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	800,135			613,986
Financing Receivable, Excluding Accrued Interest, Revolving	320,515			326,918
Loans	4,577,368			4,524,510
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	427	[1]		2,427	[2]
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	66			586
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	67			105
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	39			46
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	13			818
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	22			222
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff	0			0
Loans charged-off	634		$ 633	4,204
Construction Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	8,331			146,040
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	138,169			253,827
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	214,338			197,077
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	64,348			37,997
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4,915			3,945
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	9,026			6,500
Financing Receivable, Excluding Accrued Interest, Revolving	160,337			144,358
Loans	599,464			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	0			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	92
Construction Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	8,331			132,838
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	138,169			236,573
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	184,407			196,311
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	64,103			37,997
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4,649			3,938
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	9,006			6,457
Financing Receivable, Excluding Accrued Interest, Revolving	160,337			144,358
Loans	569,002			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	0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			7,798
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	13,912			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	266			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	14,178			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			13,166
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			9,456
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			698
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	180			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	187			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			36
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	16,019			68
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	65			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			43
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	16,084			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	13			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	13			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	7,326			41,845
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	44,666			126,981
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	148,117			145,744
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	149,473			116,280
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	114,534			63,710
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	254,774			200,301
Financing Receivable, Excluding Accrued Interest, Revolving	1,618			1,877
Loans	720,508			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	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			1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	22			118
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff	0			0
Loans charged-off	22		49	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	7,326			41,520
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	44,497			126,981
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	148,117			145,671
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	148,890			114,631
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	112,986			63,710
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	251,106			196,651
Financing Receivable, Excluding Accrued Interest, Revolving	1,545			1,803
Loans	714,467			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			32
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	30			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	30			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	512			75
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	74			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	586			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	0			325
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	169			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			73
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	71			1,379
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,282			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	3,282			3,259
Financing Receivable, Excluding Accrued Interest, Revolving	73			74
Loans	4,877			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			163
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	162			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	386			391
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	548			554
Commercial Real Estate Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	81,915			511,547
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	490,131			676,863
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	726,994			495,713
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	606,387			144,456
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	175,183			102,794
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	316,220			220,585
Financing Receivable, Excluding Accrued Interest, Revolving	16,515			16,493
Loans	2,413,345			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	788
Commercial Real Estate Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	57,374			469,844
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	472,778			641,577
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	690,253			495,363
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	606,292			143,150
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	173,900			91,085
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	273,284			189,021
Financing Receivable, Excluding Accrued Interest, Revolving	16,515			16,493
Loans	2,290,396			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			24,300
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			34,424
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	34,418			255
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			1,037
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,022			333
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	472			146
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	35,912			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	24,541			17,403
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	17,353			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,470			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			9,746
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	34,443			25,072
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	77,807			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			862
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	853			95
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	95			269
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	261			1,565
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	6,358			6,346
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	7,567			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			65
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,663			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	1,663			65
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	18,627			78,533
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	84,179			65,118
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	60,527			42,437
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	38,589			10,724
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	9,434			4,485
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	6,748			3,622
Financing Receivable, Excluding Accrued Interest, Revolving	139,949			161,974
Loans	358,053			366,893
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0			745
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	65			440
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	49			44
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	37			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	0			5
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff	0			0
Loans charged-off	151		109	1,283
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	18,574			78,090
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	83,955			62,192
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	56,619			42,114
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	37,923			10,708
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	9,421			4,356
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	6,297			3,310
Financing Receivable, Excluding Accrued Interest, Revolving	139,370			161,153
Loans	352,159			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			128
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	99			117
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	101			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	204			18
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	404			263
Commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0			191
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	183			174
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	169			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			16
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	13			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	147			162
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	512			543
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	53			14
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			2,357
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	3,434			73
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	312			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			65
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	43			12
Financing Receivable, Excluding Accrued Interest, Revolving	579			821
Loans	4,421			3,342
Commercial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0			238
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	41			267
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	206			133
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	253			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			64
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	57			120
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	557			822
Municipal loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,032			39,028
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	38,519			61,429
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	59,855			68,979
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	67,922			49,746
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	48,107			39,949
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	210,790			182,037
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	427,225			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
Municipal loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,032			39,028
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	38,519			61,429
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	59,855			68,979
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	67,922			49,746
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	48,107			39,949
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	210,790			182,037
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	427,225			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	0			0
Municipal loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	0			0
Municipal loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	0			0
Municipal loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	0			0
Loans to individuals
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	7,489			22,792
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	18,456			15,520
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	13,056			11,588
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	9,886			6,266
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,213			2,193
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,577			941
Financing Receivable, Excluding Accrued Interest, Revolving	2,096			2,216
Loans	58,773			61,516
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	427	[1]		1,682
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	1			54
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	18			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	13			6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	0			99
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff	0			0
Loans charged-off	461		$ 475	1,922
Loans to individuals | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	7,489			22,788
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	18,441			15,503
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	13,054			11,588
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	9,886			6,256
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,212			2,180
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,557			941
Financing Receivable, Excluding Accrued Interest, Revolving	2,096			2,216
Loans	58,735			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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	0			0
Loans to individuals | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	0			0
Loans to individuals | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0			13
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	10			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	10			13
Loans to individuals | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0			4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	15			17
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2			0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0			10
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1			0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	10			0
Financing Receivable, Excluding Accrued Interest, Revolving	0			0
Loans	28			31
Demand Deposit Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	$ 306			$ 1,700
[1]Includes $306,000 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	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans	$ 4,577,368	$ 4,524,510
Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	4,565,224	4,513,888
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	7,494	7,560
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,909	1,156
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,741	1,906
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	12,144	10,622
Construction Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	599,464	789,744
Construction Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	599,444	789,241
Construction Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	20	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	20	503
1-4 Family Residential Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	720,508	696,738
1-4 Family Residential Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	713,344	689,626
1-4 Family Residential Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,908	4,638
1-4 Family Residential Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	26	774
1-4 Family Residential Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,230	1,700
1-4 Family Residential Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	7,164	7,112
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Loans	2,413,345	2,168,451
Commercial Real Estate Loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	2,409,968	2,167,756
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,250	621
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,781	34
Commercial Real Estate Loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	346	40
Commercial Real Estate Loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,377	695
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans	358,053	366,893
Commercial loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	356,549	364,726
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,261	1,693
Commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	78	347
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	165	127
Commercial loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,504	2,167
Municipal loans
Financing Receivable, Past Due [Line Items]
Loans	427,225	441,168
Municipal loans | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	427,225	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	58,773	61,516
Loans to individuals | Financial Asset, Current
Financing Receivable, Past Due [Line Items]
Loans	58,694	61,398
Loans to individuals | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	55	107
Loans to individuals | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	24	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	$ 79	$ 118

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Nonperforming Assets by Asset Class (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2024	Dec. 31, 2023
Nonperforming Assets [Line Items]
Restructured loans		$ 535	$ 506
Nonperforming Assets
Nonperforming Assets [Line Items]
Nonaccrual loans	[1]	7,709	3,889
Accruing loans past due more than 90 days		0	0
Restructured loans		151	13
OREO		119	99
Repossessed assets		0	0
Total nonperforming assets		7,979	4,001
Nonperforming Assets | Construction Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		40	29
Nonperforming Assets | 1-4 Family Residential Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		2,767	2,093
Nonperforming Assets | Commercial Real Estate Loans
Nonperforming Assets [Line Items]
Nonaccrual loans		2,423	528
Nonperforming Assets | Commercial loans
Nonperforming Assets [Line Items]
Nonaccrual loans		2,451	1,208
Nonperforming Assets | Loans to individuals
Nonperforming Assets [Line Items]
Nonaccrual loans		$ 28	$ 31
[1]Includes $535,000 and $506,000 of restructured loans as of March 31, 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		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	$ 42,674	$ 36,515	$ 36,515
Loans charged-off	(634)	(633)	(4,204)
Recoveries of loans charged-off	347	362
Net loans (charged-off) recovered	(287)	(271)
Provision for (reversal of) loan losses	1,170	88
Balance at end of period	43,557	36,332	42,674
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	5,287	3,164	3,164
Loans charged-off	0	0	(92)
Recoveries of loans charged-off	0	1
Net loans (charged-off) recovered	0	1
Provision for (reversal of) loan losses	(367)	(13)
Balance at end of period	4,920	3,152	5,287
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,840	2,173	2,173
Loans charged-off	(22)	(49)	(119)
Recoveries of loans charged-off	11	5
Net loans (charged-off) recovered	(11)	(44)
Provision for (reversal of) loan losses	(61)	185
Balance at end of period	2,768	2,314	2,840
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	32,266	28,701	28,701
Loans charged-off	0	0	(788)
Recoveries of loans charged-off	3	0
Net loans (charged-off) recovered	3	0
Provision for (reversal of) loan losses	624	20
Balance at end of period	32,893	28,721	32,266
Commercial loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,086	2,235	2,235
Loans charged-off	(151)	(109)	(1,283)
Recoveries of loans charged-off	56	60
Net loans (charged-off) recovered	(95)	(49)
Provision for (reversal of) loan losses	783	(285)
Balance at end of period	2,774	1,901	2,086
Municipal loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	19	45	45
Loans charged-off	0	0	0
Recoveries of loans charged-off	0	0
Net loans (charged-off) recovered	0	0
Provision for (reversal of) loan losses	0	(1)
Balance at end of period	19	44	19
Loans to individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	176	197	197
Loans charged-off	(461)	(475)	(1,922)
Recoveries of loans charged-off	277	296
Net loans (charged-off) recovered	(184)	(179)
Provision for (reversal of) loan losses	191	182
Balance at end of period	$ 183	$ 200	$ 176

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) loans	Mar. 31, 2023 USD ($) loans	Dec. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 1,200		$ 1,000
Reversal of interest income on nonaccrual loans	34	$ 26
Nonaccrual loans, no allowance	939		1,000
Collateral-dependent loans	10,600		7,500
Restructured loans	535		506
Accrued interest receivable on our loan portfolio	$ 21,500		$ 21,300
Financing Receivable, Excluding Accrued Interest, Modified In Period, Number Of Loans Modified, Nonaccrual | loans	3
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term	20 years
Owner and nonowner-occupied real estate	$ 1,830,000
Loans secured by multi-family properties	551,800
Loans secured by farmland	$ 28,000
Commercial loans | Extended Maturity
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loans modified | loans	0
Restructured loans		$ 179
Financing Receivable, Excluding Accrued Interest, Modified In Period, Number Of Loans Modified, Nonaccrual | loans		1
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		3 Months Ended	12 Months Ended
		Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Other borrowings		$ 457,685	$ 509,820
FHLB borrowings		312,466	212,648
Other borrowings:
Debt Instrument [Line Items]
Other borrowings		457,685	509,820
Average amount outstanding during the period	[1]	229,464	436,676
Maximum amount outstanding during the period	[2]	$ 457,685	$ 1,030,421
Weighted average interest rate during the period	[3]	5.50%	4.90%
Interest rate at end of the period	[4]	5.30%	5%
FHLB borrowings:
Debt Instrument [Line Items]
FHLB borrowings		$ 312,466	$ 212,648
Average amount outstanding during the period	[1]	607,033	276,584
Maximum amount outstanding during the period	[2]	$ 702,527	$ 533,242
Weighted average interest rate during the period	[3]	3.90%	2.50%
Interest rate at end of the period	[5]	3%	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	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Less than 1 Year	$ 764,383
1-2 Years	4,825
2-3 Years	391
3-4 Years	411
4-5 Years	141
Thereafter	0
Total	770,151
Other borrowings:
Debt Instrument [Line Items]
Less than 1 Year	453,635
1-2 Years	4,050
2-3 Years	0
3-4 Years	0
4-5 Years	0
Thereafter	0
Total	457,685
FHLB borrowings:
Debt Instrument [Line Items]
Less than 1 Year	310,748
1-2 Years	775
2-3 Years	391
3-4 Years	411
4-5 Years	141
Thereafter	0
Total	$ 312,466

Borrowing Arrangements Narrativ

Borrowing Arrangements Narrative (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) credit_line oustanding_letters_of_credit	Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Number of credit lines maintained by the Company | credit_line	3
Federal funds purchased	$ 0	$ 0
Letters of Credit, Federal Home Loan Bank, as collateral	$ 0
Maturity of repurchase agreements (less than)	1 year 4 months 24 days
Securities sold under repurchase agreements	$ 91,600,000	92,100,000
Federal Home Loan Bank borrowings, additional funding available	2,010,000,000
Asset Pledged As Collateral, Excess Amount
Line of Credit Facility [Line Items]
Debt Securities	251,900,000	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
Minimum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	0.61%
Federal Home Loan Bank borrowings maturities	1 day
Maximum
Line of Credit Facility [Line Items]
Federal Home Loan Bank borrowings interest rates	4.80%
Federal Home Loan Bank borrowings maturities	4 years 3 months 18 days
Federal Reserve Discount Window
Line of Credit Facility [Line Items]
Other borrowings	$ 250,000,000	$ 300,000,000
Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Other borrowings	$ 116,100,000
LineOfCreditFacilityMaturity	1 year

Long-term Debt Other Long-term

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

3 Months Ended

Mar. 31, 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]

$ 93,913

$ 93,877

Trust preferred subordinated debentures

[2]

60,271

60,270

Total long-term debt

154,184

154,147

Southside Statutory Trust III, net of unamortized debt issuance costs

Debt Instruments [Abstract]

Trust preferred subordinated debentures

20,579

[2],[3]

20,578

[2],[3]

$ 20,619

Unamortized Debt Issuance Expense

40

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]

93,913

93,877

Unamortized Debt Issuance Expense

$ 1,100

$ 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 $40,000 at March 31, 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 $1.1 million at March 31, 2024 and 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

Mar. 31, 2024

Dec. 31, 2023

Jun. 14, 2023

Nov. 06, 2020

Oct. 10, 2007

Debt Instrument [Line Items]

Other long-term debt

[1]

$ 60,271

$ 60,270

Southside Statutory Trust III

Debt Instrument [Line Items]

Other long-term debt

$ 20,619

20,579

[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

$ 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 $40,000 at March 31, 2024 and $41,000 at December 31, 2023. On June 14, 2023, the Company repurchased $5.0 million of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030.

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 910	$ 925
Expected return on assets	(1,215)	(1,143)
Net loss amortization	149	166
Net periodic benefit cost (income)	(156)	(52)
Retirement Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Interest cost	28	32
Expected return on assets	(46)	(47)
Net loss amortization	0	0
Net periodic benefit cost (income)	(18)	(15)
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	203	206
Expected return on assets	0	0
Net loss amortization	18	7
Net periodic benefit cost (income)	$ 221	$ 213

Employee Benefit Plans Narrativ

Employee Benefit Plans Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Noncash adjustment to employee benefit plan liabilities, consisting of changes in net loss	$ 167	$ 173

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	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items	$ 20,422	$ 13,642
Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Securities AFS, at estimated fair value	Securities AFS, at estimated fair value
Amortized cost of hedged assets - Securities AFS	$ 485,979	$ 487,486

Derivative Financial Instrume_4

Derivative Financial Instruments and Hedging Activities - Schedule Of Derivative Instruments (Details) - USD ($)		Mar. 31, 2024	Dec. 31, 2023
Asset Derivative
Gross derivatives		$ 68,278,000	$ 56,639,000
Offsetting derivative assets		(1,851,000)	(7,435,000)
Cash collateral received/posted		(65,360,000)	(46,760,000)
Net derivatives included in the consolidated balance sheets	[1]	1,067,000	2,444,000
Liability Derivative
Gross derivatives		23,637,000	25,684,000
Offsetting derivative liabilities		(1,851,000)	(7,435,000)
Cash collateral received/posted		0	0
Net derivatives included in the consolidated balance sheets	[1]	21,786,000	18,249,000
Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		940,000,000,000
Financial Institution Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		1,000,000	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]	940,000,000	1,010,000,000
Asset Derivative
Gross derivatives		26,043,000	24,223,000
Liability Derivative
Gross derivatives		1,824,000	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]	453,440,000	453,440,000
Asset Derivative
Gross derivatives		20,422,000	13,658,000
Liability Derivative
Gross derivatives		0	16,000
Financial Institution Counterparties | Derivatives designated as non-hedging instruments | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	245,874,000	248,073,000
Asset Derivative
Gross derivatives		21,786,000	18,249,000
Liability Derivative
Gross derivatives		27,000	509,000
Customer Counterparties
Derivatives, Fair Value [Line Items]
Credit exposure related to interest rate swaps		27,000	509,000
Customer Counterparties | Derivatives designated as non-hedging instruments | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	245,874,000	248,073,000
Asset Derivative
Gross derivatives		27,000	509,000
Liability Derivative
Gross derivatives		$ 21,786,000	$ 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 March 31, 2024, we had $1.0 million credit exposure related to interest rate swaps with financial institutions and $27,000 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 ($)		3 Months Ended	12 Months Ended
		Mar. 31, 2024	Dec. 31, 2023
Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		$ 940,000,000,000
Financial Institution Counterparties | Derivatives designated as non-hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 245,874,000	$ 248,073,000
Remaining Maturity		7 years 2 months 12 days	7 years 4 months 24 days
Weighted Average Receive Rate		5.81%	5.84%
Weighted Average Pay Rate		2.87%	2.88%
Financial Institution Counterparties | Cash Flow Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 940,000,000	$ 1,010,000,000
Remaining Maturity		2 years 3 months 18 days	2 years 3 months 18 days
Weighted Average Receive Rate		5.40%	5.44%
Weighted Average Pay Rate		2.94%	2.65%
Financial Institution Counterparties | Fair Value Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 453,440,000	$ 453,440,000
Remaining Maturity		5 years 1 month 6 days	5 years 4 months 24 days
Weighted Average Receive Rate		5.34%	5.37%
Weighted Average Pay Rate		3.13%	3.13%
Customer Counterparties | Derivatives designated as non-hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	[1]	$ 245,874,000	$ 248,073,000
Remaining Maturity		7 years 2 months 12 days	7 years 4 months 24 days
Weighted Average Receive Rate		2.87%	2.88%
Weighted Average Pay Rate		5.81%	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
	Mar. 31, 2024	Mar. 31, 2023
Derivative [Line Items]
Gain (loss) included in interest expense on deposits	$ 38,198	$ 19,906
Gain (loss) included in interest expense on FHLB borrowings	5,950	3,141
Gain (loss) included in interest expense on other borrowings	3,131	2,418
Total interest expense	49,410	27,495
Gain (loss) included in interest income on tax-exempt investment securities	11,088	13,916
Other noninterest income	1,059	1,398
Interest Rate Swap | Derivatives designated as non-hedging instruments
Derivative [Line Items]
Other noninterest income	0	160
Interest Rate Swap | Cash Flow Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
Gain (loss) included in interest expense on deposits	4,111	3,071
Gain (loss) included in interest expense on FHLB borrowings	2,531	1,901
Gain (loss) included in interest expense on other borrowings	0	136
Total interest expense	6,642	5,108
Interest Rate Swap | Fair Value Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
Gain (loss) included in interest income on tax-exempt investment securities	$ 2,622	$ 2,450

Derivative Financial Instrume_7

Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Mar. 31, 2024
Derivative [Line Items]
Securities AFS, at estimated fair value	$ 1,296,294,000	$ 1,405,221,000
Cash collateral received from counterparties under master netting agreements	46,760,000	65,360,000
Gain (Loss) on Hedging Activity	$ 6,500,000
Fair Value Hedging
Derivative [Line Items]
Securities AFS, at estimated fair value		449,400,000
Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		$ 940,000,000,000

Fair Value Measurement - Recurr

Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 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 $1,454,043 and $1,332,467, respectively)		$ 1,405,221	$ 1,296,294
Derivative assets	[1]	1,067	2,444
Derivative liabilities	[1]	21,786	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 $1,454,043 and $1,332,467, respectively)		139,186	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 $1,454,043 and $1,332,467, respectively)		548,545	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 $1,454,043 and $1,332,467, respectively)		13,709	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 $1,454,043 and $1,332,467, respectively)	[2]	699,077	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 $1,454,043 and $1,332,467, respectively)	[2]	4,704	4,748
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		4,533,811	4,481,836
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans		4,228,531	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		4,228,531	4,198,879
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments		5,252	5,308
Total asset fair value measurements		1,478,751	1,358,241
Total liability fair value measurements		23,637	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 $1,454,043 and $1,332,467, respectively)		139,186	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 $1,454,043 and $1,332,467, respectively)		548,545	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 $1,454,043 and $1,332,467, respectively)		13,709	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 $1,454,043 and $1,332,467, respectively)	[3]	699,077	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 $1,454,043 and $1,332,467, respectively)	[3]	4,704	4,748
Fair Value, Recurring | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		68,278	56,639
Derivative liabilities		23,637	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		5,252	5,308
Total asset fair value measurements		144,438	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 $1,454,043 and $1,332,467, respectively)		139,186	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 $1,454,043 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 $1,454,043 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 $1,454,043 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 $1,454,043 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		1,334,313	1,213,208
Total liability fair value measurements		23,637	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 $1,454,043 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 $1,454,043 and $1,332,467, respectively)		548,545	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 $1,454,043 and $1,332,467, respectively)		13,709	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 $1,454,043 and $1,332,467, respectively)	[3]	699,077	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 $1,454,043 and $1,332,467, respectively)	[3]	4,704	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		68,278	56,639
Derivative liabilities		23,637	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 $1,454,043 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 $1,454,043 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 $1,454,043 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 $1,454,043 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 $1,454,043 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		119	99
Total asset fair value measurements		9,779	7,099
Fair Value, Nonrecurring | Collateral Pledged
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	[4]	9,660	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		119	99
Total asset fair value measurements		9,779	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]	$ 9,660	$ 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 March 31, 2024, we had $1.0 million credit exposure related to interest rate swaps with financial institutions and $27,000 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	Mar. 31, 2024	Dec. 31, 2023
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 469,373	$ 560,510
Investment securities:
HTM, at carrying value	1,186,842	1,186,152
Mortgage-backed securities:
HTM, at carrying value	120,056	120,901
FHLB stock, at cost	27,958	11,936
Equity investments	4,302	4,383
Loans, net of allowance for loan losses	4,533,811	4,481,836
Loans held for sale	756	10,894
Financial liabilities:
Deposits	6,545,760	6,549,681
Other borrowings	457,685	509,820
FHLB borrowings	312,466	212,648
Subordinated notes, net of unamortized debt issuance costs	93,913	93,877
Trust preferred subordinated debentures, net of unamortized debt issuance costs	60,271	60,270
Estimated Fair Value
Financial assets:
Cash and cash equivalents	469,373	560,510
Investment securities:
HTM, at carrying value	1,043,056	1,054,739
Mortgage-backed securities:
HTM, at carrying value	109,130	111,423
FHLB stock, at cost	27,958	11,936
Equity investments	4,302	4,383
Loans, net of allowance for loan losses	4,228,531	4,198,879
Loans held for sale	756	10,894
Financial liabilities:
Deposits	6,523,686	6,534,929
Other borrowings	458,750	510,242
FHLB borrowings	303,076	202,750
Subordinated notes, net of unamortized debt issuance costs	87,292	86,285
Trust preferred subordinated debentures, net of unamortized debt issuance costs	57,168	57,480
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	469,373	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	1,043,056	1,054,739
Mortgage-backed securities:
HTM, at carrying value	109,130	111,423
FHLB stock, at cost	27,958	11,936
Equity investments	4,302	4,383
Loans, net of allowance for loan losses	0	0
Loans held for sale	756	10,894
Financial liabilities:
Deposits	6,523,686	6,534,929
Other borrowings	458,750	510,242
FHLB borrowings	303,076	202,750
Subordinated notes, net of unamortized debt issuance costs	87,292	86,285
Trust preferred subordinated debentures, net of unamortized debt issuance costs	57,168	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	4,228,531	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)	3 Months Ended
	Mar. 31, 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
	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Current income tax expense	$ 4,764	$ 4,737
Deferred income tax expense (benefit)	(142)	(194)
Income tax expense	$ 4,622	$ 4,543

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Deferred tax assets, net	$ 29,900,000		$ 30,400,000
Deferred tax assets, valuation allowance	0		$ 0
Income tax expense	$ 4,622,000	$ 4,543,000
Effective income tax rate, percent	17.70%	14.90%

Off-Balance-Sheet Arrangement_3

Off-Balance-Sheet Arrangements, Allowance for off-balance-sheet credit exposures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 3,932	$ 3,687
Provision for (reversal of) off-balance-sheet credit exposures	(1,112)	(128)
Balance at end of period	$ 2,820	$ 3,559

Off-Balance-Sheet Arrangement_4

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 1,011,878	$ 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	999,493	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	$ 12,385	$ 10,823

Off-Balance-Sheet Arrangement_5

Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 372,000	$ 192,000
Operating lease ROU assets	14,876,000		$ 14,837,000
Unsettled trades to purchase securities	7,160,000	0	0
Unsettled trades to sell securities	6,406,000	$ 4,044,000	0
Unsettled Issuances of Brokered CDs	$ 0		$ 0