First Financial Bankshares (FFIN) 10-Q 4 Nov 24 2024 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2024	Nov. 04, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Document Period End Date	Sep. 30, 2024
Entity Registrant Name	First Financial Bankshares, Inc.
Entity Central Index Key	0000036029
Entity Filer Category	Large Accelerated Filer
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Securities Act File Number	0-07674
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	75-0944023
Entity Address, Address Line One	400 Pine Street
Entity Address, City or Town	Abilene
Entity Address, State or Province	TX
City Area Code	325
Local Phone Number	627-7155
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	FFIN
Security Exchange Name	NASDAQ
Entity Address, Postal Zip Code	79601
Entity Common Stock, Shares Outstanding		142,910,170

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
ASSETS
CASH AND DUE FROM BANKS	$ 296,188,000	$ 281,354,000	$ 208,277,000
Interest-bearing demand deposits in banks	287,476,000	255,237,000	180,008,000
Total cash and cash equivalents	583,664,000	536,591,000	388,285,000
SECURITIES AVAILABLE-FOR-SALE, at fair value (amortized cost of these securities was $5,030,124, $5,463,186, and $5,243,681 as of September 30, 2024 and 2023, and December 31, 2023, respectively)	4,612,299,000	4,732,762,000	4,652,537,000
LOANS:
Held-for-investment	7,723,191,000	7,148,791,000	6,994,696,000
Less-Allowance for credit losses	(99,936,000)	(88,734,000)	(89,714,000)
Net loans held-for-investment	7,623,255,000	7,060,057,000	6,904,982,000
Held-for-sale ($16,513, $11,908, and $11,077, at fair value at September 30, 2024 and 2023, and December 31, 2023, respectively)	20,114,000	14,253,000	12,229,000
BANK PREMISES AND EQUIPMENT, net	151,204,000	151,788,000	152,936,000
INTANGIBLE ASSETS, net	314,152,000	314,622,000	314,850,000
OTHER ASSETS	278,244,000	295,521,000	351,599,000
Total assets	13,582,932,000	13,105,594,000	12,777,418,000
LIABILITIES AND SHAREHOLDERS' EQUITY
NONINTEREST-BEARING DEPOSITS	3,303,143,000	3,435,586,000	3,477,553,000
INTEREST-BEARING DEPOSITS	8,452,718,000	7,702,714,000	7,238,970,000
Total deposits	11,755,861,000	11,138,300,000	10,716,523,000
DIVIDENDS PAYABLE	25,739,000	25,712,000	25,730,000
REPURCHASE AGREEMENTS	57,557,000	381,928,000	621,791,000
BORROWINGS	25,978,000	22,153,000	129,753,000
TRADE DATE PAYABLE	5,416,000	0	2,500,000
OTHER LIABILITIES	50,190,000	38,601,000	41,011,000
Total liabilities	11,920,741,000	11,606,694,000	11,537,308,000
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY:
COMMON STOCK - $0.01 par value, authorized 200,000,000 shares; 142,906,070, 142,677,069, and 142,716,939 shares issued at September 30, 2024 and 2023, and December 31, 2023, respectively)	1,429,000	1,427,000	1,427,000
CAPITAL SURPLUS	687,065,000	681,246,000	679,374,000
RETAINED EARNINGS	1,303,514,000	1,219,525,000	1,199,243,000
TREASURY STOCK (shares at cost: 931,423, 926,723, and 930,152 at September 30, 2024 and 2023, and December 31, 2023, respectively)	(12,653,000)	(11,855,000)	(11,658,000)
DEFERRED COMPENSATION	12,653,000	11,855,000	11,658,000
ACCUMULATED OTHER COMPREHENSIVE EARNINGS (LOSS), net	(329,817,000)	(403,298,000)	(639,934,000)
Total shareholders' equity	1,662,191,000	1,498,900,000	1,240,110,000
Total liabilities and shareholders' equity	$ 13,582,932,000	$ 13,105,594,000	$ 12,777,418,000

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Statement of Financial Position [Abstract]
Securities, available-for-sale, amortized cost	$ 5,030,124	$ 5,243,681	$ 5,463,186
Loans held-for-sale, fair value	$ 16,513	$ 11,077	$ 11,908
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000	200,000,000
Common stock, shares issued	142,906,070	142,716,939	142,677,069
Treasury stock, shares	931,423	930,152	926,723

Consolidated Statements of Earn

Consolidated Statements of Earnings (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
INTEREST INCOME:
Interest and fees on loans	$ 129,638,000	$ 106,377,000	$ 370,438,000	$ 293,453,000
Interest on investment securities:
Taxable	19,866,000	19,425,000	59,730,000	60,240,000
Exempt from federal income tax	7,696,000	8,757,000	23,120,000	28,145,000
Interest on federal funds sold and interest-bearing demand deposits in banks	2,758,000	792,000	9,838,000	4,026,000
Total interest income	159,958,000	135,351,000	463,126,000	385,864,000
INTEREST EXPENSE:
Interest on deposits	51,995,000	36,165,000	145,661,000	85,606,000
Interest on repurchase agreements and borrowings	854,000	5,037,000	6,841,000	13,957,000
Total interest expense	52,849,000	41,202,000	152,502,000	99,563,000
Net interest income	107,109,000	94,149,000	310,624,000	286,301,000
Provision for credit losses	6,123,000	2,276,000	12,817,000	10,631,000
Net interest income after provision for credit losses	100,986,000	91,873,000	297,807,000	275,670,000
NONINTEREST INCOME:
Trust fees	11,694,000	10,050,000	34,787,000	29,778,000
Service charges on deposit accounts	6,428,000	6,509,000	18,683,000	18,855,000
Debit card fees	5,528,000	5,041,000	15,564,000	16,697,000
Credit card fees	617,000	694,000	1,920,000	2,014,000
Gain on sale and fees on mortgage loans	3,359,000	3,442,000	10,174,000	9,950,000
Net gain on sale of available-for-sale securities	0	(972,000)	0	(914,000)
Net gain (loss) on sale of foreclosed assets	(30,000)	(10,000)	(88,000)	23,000
Net gain on sale of other assets	267,000	696,000	269,000	1,626,000
Interest on loan recoveries	1,359,000	698,000	2,578,000	1,519,000
Other noninterest income	3,140,000	1,922,000	9,125,000	6,477,000
Total noninterest income	32,362,000	28,070,000	93,012,000	86,025,000
NONINTEREST EXPENSE:
Salaries, commissions and employee benefits	37,497,000	32,935,000	111,652,000	96,162,000
Net occupancy expense	3,738,000	3,565,000	10,826,000	10,418,000
Equipment expense	2,291,000	2,200,000	6,761,000	6,525,000
FDIC insurance premiums	1,514,000	1,573,000	4,987,000	4,644,000
Debit card expense	3,248,000	3,284,000	9,548,000	9,704,000
Professional and service fees	2,793,000	2,425,000	8,017,000	7,187,000
Printing, stationery and supplies	199,000	512,000	1,071,000	1,962,000
Operational and other losses	955,000	959,000	2,878,000	2,746,000
Software amortization and expense	3,712,000	2,441,000	9,875,000	7,271,000
Amortization of intangible assets	157,000	228,000	471,000	684,000
Other noninterest expense	9,908,000	9,417,000	28,879,000	27,104,000
Total noninterest expense	66,012,000	59,539,000	194,965,000	174,407,000
EARNINGS BEFORE INCOME TAXES	67,336,000	60,404,000	195,854,000	187,288,000
INCOME TAX EXPENSE	12,028,000	10,848,000	34,664,000	34,291,000
NET EARNINGS	$ 55,308,000	$ 49,556,000	$ 161,190,000	$ 152,997,000
NET EARNINGS PER SHARE, BASIC	$ 0.39	$ 0.35	$ 1.13	$ 1.07
NET EARNINGS PER SHARE, DILUTED	0.39	0.35	1.13	1.07
DIVIDENDS PER SHARE	$ 0.18	$ 0.18	$ 0.54	$ 0.53

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Earnings (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
NET EARNINGS	$ 55,308	$ 49,556	$ 161,190	$ 152,997
OTHER ITEMS OF COMPREHENSIVE EARNINGS (LOSS):
Change in unrealized gain (loss) on investment securities available-for-sale, before income taxes	141,443	(190,407)	93,014	(133,453)
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings, before income taxes	0	972	0	914
Total other items of comprehensive earnings (loss)	141,443	(189,435)	93,014	(132,539)
Income tax benefit (expense) related to:
Change in unrealized gain (loss) on investment securities available-for-sale	(29,703)	39,985	(19,533)	28,025
Reclassification adjustment for realized gains (losses) on investment securities included in net earnings	0	(204)	0	(192)
Total income tax benefit (expense)	(29,703)	39,781	(19,533)	27,833
COMPREHENSIVE EARNINGS (LOSS)	$ 167,048	$ (100,098)	$ 234,671	$ 48,291

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Deferred Compensation [Member]	Accumulated Other Comprehensive Earnings (Loss) [Member]
Beginning Balance at Dec. 31, 2022	$ 1,265,737	$ 1,427	$ 677,593	$ 1,121,945	$ (11,035)	$ 11,035	$ (535,228)
Beginning Balance, Shares at Dec. 31, 2022		142,657,871
Treasury Stock, Beginning Balance, Shares at Dec. 31, 2022					(929,210)
Net Income (Loss)	152,997			152,997
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited)	1,483	$ 1	1,482
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited), Shares		120,535
Cash dividends declared	(75,699)			(75,699)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	(104,706)						(104,706)
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (623)	623
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					2,487
Stock- based compensation expense (unaudited)	3,033		3,033
Shares repurchased under stock repurchase authorization (unaudited) Value	(2,735)	$ (1)	(2,734)
Shares repurchased under stock repurchase authorization (unaudited) Shares		(101,337)
Ending Balance at Sep. 30, 2023	$ 1,240,110	$ 1,427	679,374	1,199,243	$ (11,658)	11,658	(639,934)
Ending Balance, Shares at Sep. 30, 2023		142,677,069
Treasury Stock, Ending Balance, Shares at Sep. 30, 2023	(926,723)				(926,723)
Beginning Balance at Jun. 30, 2023	$ 1,367,233	$ 1,427	680,676	1,175,410	$ (11,466)	11,466	(490,280)
Beginning Balance, Shares at Jun. 30, 2023		142,741,196
Treasury Stock, Beginning Balance, Shares at Jun. 30, 2023					(927,608)
Net Income (Loss)	49,556			49,556
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited)	384	$ 1	383
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited), Shares		37,210
Cash dividends declared	(25,723)			(25,723)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	(149,654)						(149,654)
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (192)	192
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					885
Stock- based compensation expense (unaudited)	1,049		1,049
Shares repurchased under stock repurchase authorization (unaudited) Value	(2,735)	$ (1)	(2,734)
Shares repurchased under stock repurchase authorization (unaudited) Shares		(101,337)
Ending Balance at Sep. 30, 2023	$ 1,240,110	$ 1,427	679,374	1,199,243	$ (11,658)	11,658	(639,934)
Ending Balance, Shares at Sep. 30, 2023		142,677,069
Treasury Stock, Ending Balance, Shares at Sep. 30, 2023	(926,723)				(926,723)
Beginning Balance at Dec. 31, 2023	$ 1,498,900	$ 1,427	681,246	1,219,525	$ (11,855)	11,855	(403,298)
Beginning Balance, Shares at Dec. 31, 2023		142,716,939
Treasury Stock, Beginning Balance, Shares at Dec. 31, 2023	(930,152)				(930,152)
Net Income (Loss)	$ 161,190			161,190
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited)	2,387	$ 2	2,385
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited), Shares		189,131
Cash dividends declared	(77,201)			(77,201)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	73,481						73,481
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (798)	798
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					(1,271)
Stock- based compensation expense (unaudited)	3,434		3,434
Ending Balance at Sep. 30, 2024	$ 1,662,191	$ 1,429	687,065	1,303,514	$ (12,653)	12,653	(329,817)
Ending Balance, Shares at Sep. 30, 2024		142,906,070
Treasury Stock, Ending Balance, Shares at Sep. 30, 2024	(931,423)				(931,423)
Beginning Balance at Jun. 30, 2024	$ 1,519,026	$ 1,428	685,209	1,273,946	$ (12,378)	12,378	(441,557)
Beginning Balance, Shares at Jun. 30, 2024		142,848,909
Treasury Stock, Beginning Balance, Shares at Jun. 30, 2024					(934,135)
Net Income (Loss)	55,308			55,308
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited)	602	$ 1	601
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited), Shares		57,161
Cash dividends declared	(25,740)			(25,740)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	111,740						111,740
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (275)	275
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					2,712
Stock- based compensation expense (unaudited)	1,255		1,255
Ending Balance at Sep. 30, 2024	$ 1,662,191	$ 1,429	$ 687,065	$ 1,303,514	$ (12,653)	$ 12,653	$ (329,817)
Ending Balance, Shares at Sep. 30, 2024		142,906,070
Treasury Stock, Ending Balance, Shares at Sep. 30, 2024	(931,423)				(931,423)

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Cash dividend per share	$ 0.18	$ 0.18	$ 0.54	$ 0.53

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 161,190	$ 152,997
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	9,924	9,290
Provision for credit losses	12,817	10,631
Securities premium amortization, net	34,041	40,376
Gain on sale of securities and other assets, net	(181)	(735)
Deferred federal income tax benefit	1,011	1,789
Stock-based compensation	3,434	3,033
Net tax benefit from stock-based compensation	220	269
Change in loans held-for-sale	(5,754)	(312)
Change in other assets	(8,218)	(371)
Change in other liabilities	16,686	9,126
Total adjustments	63,980	73,096
Net cash provided by operating activities	225,170	226,093
Activity in available-for-sale securities:
Sales	0	320,419
Maturities	4,536,702	333,273
Purchases	(4,351,769)	(3,322)
Net increase in loans held-for-investment	(574,867)	(553,762)
Purchases of bank premises, equipment and software	(11,946)	(13,386)
Proceeds from sale of bank premises and equipment and other assets	1,555	3,740
Net cash provided by (used in) investing activities	(400,325)	86,962
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in noninterest-bearing deposits	(132,443)	(584,235)
Net increase in interest-bearing deposits	750,004	295,250
Net increase (decrease) in repurchase agreements and borrowings	(320,546)	109,036
Common stock transactions:
Proceeds from stock option exercises/stock unit conversions/restricted stock activity	2,387	1,483
Dividends paid	(77,174)	(74,247)
Repurchases of stock		(2,735)
Net cash provided by (used in) financing activities	222,228	(255,448)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	47,073	57,607
CASH AND CASH EQUIVALENTS, beginning of period	536,591	330,678
CASH AND CASH EQUIVALENTS, end of period	583,664	388,285
SUPPLEMENTAL INFORMATION AND NONCASH TRANSACTIONS:
Interest paid	153,215	87,127
Federal income taxes paid	31,173	35,529
Investment securities purchased not settled	5,416	2,500
Transfer of loans to other real estate	$ 1,156	$ 190

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 55,308	$ 49,556	$ 161,190	$ 152,997

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 – Summary of Significant Accounting Policies Nature of Operations First Financial Bankshares, Inc., a Texas corporation (“Bankshares,” “Company,” “we” or “us”), is a financial holding company which owns all of the capital stock of First Financial Bank which had 79 locations located in Texas as of September 30, 2024 . The Company’s primary source of revenue is providing loans and banking services to consumers and commercial customers in the market area in which First Financial Bank is located. In addition, the Company also owns First Financial Trust & Asset Management Company, First Financial Insurance Agency, Inc. (inactive), First Technology Services, Inc., FFB Investment Paris Fund, LLC, and FFB Portfolio Management, Inc. Basis of Presentation A summary of significant accounting policies of the Company and its subsidiaries applied in the preparation of the accompanying consolidated financial statements follows. The accounting principles followed by the Company and the methods of applying them are in conformity with both United States generally accepted accounting principles (“GAAP”) and prevailing practices of the banking industry. The Company evaluated subsequent events for potential recognition through the date the consolidated financial statements were issued. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The Company’s significant estimates include its allowance for credit losses and its valuation of financial instruments. Consolidation The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries, all of which are wholly-owned. All significant intercompany accounts and transactions have been eliminated. Stock Repurchase On July 23, 2024, the Company’s Board of Directors extended the authorization to repurchase up to 5,000,000 common shares through July 31, 2025. The prior authorization had been in place since July 27, 2021. The stock repurchase plan authorizes management to repurchase and retire the stock at such time as repurchases and retirements are considered beneficial to the Company and stockholders. Any repurchase of stock will be made through the open market, block trades, or in privately negotiated transactions in accordance with applicable laws and regulations. Under the repurchase plan, there is no minimum number of shares that the Company is required to repurchase. Under the previous authorization effective through July 31, 2024, the Company repurchased and retired 101,337 shares (all during September 2023) at an average price of $ 26.99 per share. Other Recently Issued and Effective Authoritative Accounting Guidance ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” ASU 2020-04 provides optional expedients and exceptions for accounting related to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. ASU 2020-04 applies only to contracts, hedging relationships, and other transactions that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform and do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. ASU 2020-04 was effective upon issuance, and based upon the amendments provided in ASU 2022-06 discussed below, can generally be applied through December 31, 2024. The adoption of ASU 2020-04 did not have a significant impact on our financial statements. ASU 2021-01, “Reference Rate Reform (Topic 848): Scope.” ASU 2021-01 clarifies that certain optional expedients and exceptions in ASC 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. ASU 2021-01 also amends the expedients and exceptions in ASC 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition. ASU 2021-01 was effective upon issuance, and based upon the amendments provided in ASU 2022-06 discussed below, can generally be applied through December 31, 2024. The adoption of ASU 2021-01 did not have a significant impact on our financial statements. ASU 2022-02, "Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures." ASU 2022-02 eliminates the accounting guidance for troubled debt restructurings in ASC Subtopic 310-40, Receivables - Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. ASU 2022-02 will also require that an entity disclose current-period gross charge-offs by year of origination for financial receivables and net investment leases within the scope of ASC Subtopic 326-20, Financial Instruments - Credit Losses - Measured at Amortized Cost. ASU 2022-02 became effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, though early adoption is permitted. The adoption of ASU 2022-02 did not have a significant impact on our financial statements. ASU 2022-06, "Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848." ASU 2022-06 extends the period of time preparers can utilize the reference rate reform relief guidance provided by ASU 2020-04 and ASU 2021-01, which are discussed above. ASU 2022-06, which was effective upon issuance, defers the sunset date of this prior guidance from December 31, 2022 to December 31, 2024, after which entities will no longer be permitted to apply the relief guidance in Topic 848. The adoption of ASU 2022-06 did not have a significant impact on our financial statements. ASU 2023-02, "Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method." ASU 2023-02 is intended to improve the accounting and disclosures for investments in tax credit structures. ASU 2023-02 allows entities to elect to account for qualifying tax equity investments using the proportional amortization method, regardless of the program giving rise to the related income tax credits. Previously, this method was only available for qualifying tax equity investments in low-income housing tax credit structures. ASU 2023-02 has been early adopted by the Company as it relates to the qualifying investments that are generating New Market Tax Credits. The adoption of ASU 2023-02 did not have a significant impact on our financial statements. ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” ASU 2023-09 requires entities to disclose more detailed information in their reconciliation of their statutory tax rate to their effective tax rate. Public business entities (PBEs) are required to provide this incremental detail in a numerical, tabular format. The ASU also requires entities to disclose more detailed information about income taxes paid, including by jurisdiction; pretax income (or loss) from continuing operations; and income tax expense (or benefit). PBEs will be required to adopt the new requirements in annual reporting periods beginning after December 15, 2024, and interim periods beginning after December 15, 2025. The adoption of ASU 2023-09 is not expected to have a significant impact on our financial statements. Investment Securities Management classifies debt securities as held-to-maturity, available-for-sale, or trading based on its intent. Securities that management has the positive intent and ability to hold to maturity are classified as held-to-maturity and recorded at amortized cost, adjusted for amortization of premiums and accretion of discounts, which are recognized as adjustments to interest income using the interest method. Securities not classified as held-to-maturity or trading are classified as available-for-sale and recorded at fair value, with unrealized holding gains and losses (those for which no allowance for credit losses are recorded) reported as a component of other comprehensive income, net of tax. Management determines the appropriate classification of securities at the time of purchase. Interest income includes amortization of purchase premiums and discounts over the period to maturity using a level-yield method, except for premiums on callable securities, which are amortized to their earliest call date. Realized gains and losses are recorded on the sale of securities in noninterest income. The Company has made a policy election to exclude accrued interest from the amortized cost basis of securities and report accrued interest separately in other assets on the consolidated balance sheets. A security is placed on nonaccrual status at the time any principal or interest payments become more than 90 days delinquent or if full collection of interest or principal becomes uncertain. Accrued interest for a security placed on nonaccrual is reversed against interest income. There was no accrued interest related to securities reversed against interest income for the three and nine-months ended September 30, 2024 or 2023, respectively. The Company records its available-for-sale securities portfolio at fair value. Fair values of these securities are determined based on methodologies in accordance with current authoritative accounting guidance. Fair values are volatile and may be influenced by a number of factors, including market interest rates, prepayment speeds, discount rates, credit ratings, and yield curves. Fair values for securities are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on the quoted prices of similar instruments or an estimate of fair value by using a range of fair value estimates in the marketplace as a result of the illiquid market, specific to the type of security. The Company’s investment portfolio currently consists of obligations of state and political subdivisions, mortgage pass-through securities, corporate bonds and general obligation or revenue based municipal bonds. Pricing for such securities is generally readily available and transparent in the market. The Company utilizes independent third-party pricing services to value its investment securities, which the Company reviews as well as the underlying pricing methodologies for reasonableness and to ensure such prices are aligned with pricing matrices. The Company validates prices supplied by the independent pricing services by comparison to prices obtained from other third-party sources on a quarterly basis. Allowance for Credit Losses – Available-for-Sale Securities For available-for-sale securities in an unrealized loss position, we first assess whether we intend to sell, or if it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, any previously recognized allowances are charged-off and the security’s amortized cost basis is written down to fair value through income as a provision for credit losses. For available-for-sale securities that do not meet the aforementioned criteria, we evaluate whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Management has made the accounting policy election to exclude accrued interest receivable on available-for-sale securities from the estimate of credit losses. Changes in the allowance for credit losses are recorded as provision for (or reversal of) credit losses. Available-for-sale securities are charged-off against the allowance or, in the absence of any allowance, written down through income when deemed uncollectible by management or when either of the aforementioned criteria regarding intent or requirement to sell is met. At September 30, 2024 and 2023, and December 31, 2023 , no allowance for credit losses - available-for-sale securities was recorded. Allowance for Credit Losses – Held-to-Maturity Securities The allowance for credit losses on held-to-maturity securities is a contra-asset valuation account, calculated in accordance with ASC 326, that is deducted from the amortized cost basis of held-to-maturity securities to present management’s best estimate of the net amount expected to be collected. Held-to-maturity securities are charged-off against the allowance when deemed uncollectible by management. Adjustments to the allowance are reported in our income statement as a component of credit loss expense. Management measures expected credit losses on held-to-maturity securities on a collective basis by major security type with each type sharing similar risk characteristics and considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. Management has made the accounting policy election to exclude accrued interest receivable on held-to-maturity securities from the estimate of credit losses. At September 30, 2024 and 2023, and December 31, 2023 , the Company held no securities that were classified as held-to-maturity. Loans Held-for-Investment Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at amortized cost, net of the allowance for credit losses. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts, fair value hedge accounting adjustments, deferred loan fees and costs. The Company has made a policy election to exclude accrued interest from the amortized cost basis of loans and report accrued interest separately from the related loan balance in other assets on the condensed consolidated balance sheets. Interest on loans is calculated by using the simple interest method on daily balances of the principal amounts outstanding. The Company defers and amortizes net loan origination fees and costs as an adjustment to yield. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are placed on nonaccrual status when, in management’s opinion, the borrower may be unable to meet payment obligations as they become due, as well as when required by regulatory provisions. In determining whether or not a borrower may be unable to meet payment obligations for each class of loans, we consider the borrower’s debt service capacity through the analysis of current financial information, if available, and/or current information with regards to our collateral position. Regulatory provisions would typically require the placement of a loan on nonaccrual status if principal or interest has been in default for a period of 90 days or more unless the loan is both well secured and in the process of collection or full payment of principal and interest is not expected. Loans may be placed on nonaccrual status regardless of whether or not such loans are considered past due. When interest accrual is discontinued, all unpaid accrued interest is reversed. Interest income on nonaccrual loans is recognized only to the extent that cash payments are received in excess of principal due. A loan may be returned to accrual status when all the principal and interest amounts contractually due are brought current and future principal and interest amounts contractually due are reasonably assured. Further information regarding our accounting policies related to past due loans, nonaccrual loans and loans to borrowers experiencing financial difficulty is presented in Note 3. Acquired Loans Loans acquired in connection with acquisitions are recorded at their acquisition-date fair value. The allowance for credit losses related to the acquired loan portfolio is not carried over. Acquired loans are classified into two categories based on the credit risk characteristics of the underlying borrowers as either purchased credit deteriorated (“PCD”) loans, or loans with no evidence of credit deterioration (“non-PCD”). PCD loans are defined as a loan or pool of loans that have experienced more-than-insignificant credit deterioration since the origination date. The Company uses a combination of individual and pooled review approaches to determine if acquired loans are PCD. At acquisition, the Company considers a number of factors to determine if an acquired loan or pool of loans has experienced more-than-insignificant credit deterioration. The initial allowance related to PCD loans that share similar risk characteristics is established using a pooled approach. The Company uses either a discounted cash flow or weighted average remaining life method to determine the required level of the allowance. PCD loans that were classified as nonaccrual as of the acquisition date and are collateral dependent are assessed for allowance on an individual basis. For PCD loans, an initial allowance is established on the acquisition date. Subsequent to the acquisition date, the initial allowance for credit losses on PCD loans will increase or decrease based on future evaluations, with changes recognized in the provision for credit losses. Non-PCD loans are pooled into segments together with originated loans that share similar risk characteristics and have an allowance established on the acquisition date, which is recognized in the current period provision for credit losses as well as a fair value adjustment to the amortized cost of the loan and accreted into income over the life of the loan. Determining the fair value of the acquired loans involves estimating the principal and interest payment cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. Management considers a number of factors in evaluating the acquisition-date fair value including the remaining life, interest rate profile, market interest rate environment, payment schedules, risk ratings, probability of default and loss given default, and estimated prepayment rates. For PCD loans, the non-credit discount or premium is allocated to individual loans as determined by the difference between the loan’s unpaid principal balance and amortized cost basis. For non-PCD loans, the fair value discount or premium is allocated to individual loans and recognized into interest income on a level yield basis over the remaining expected life of the loan. Allowance for Credit Losses - Loans The allowance for credit losses (“allowance” or “ACL”) is a contra-asset valuation account, calculated in accordance with ASC 326, that is deducted from the amortized cost basis of loans. The ACL represents an amount which, in management’s judgment, is adequate to absorb the lifetime expected credit losses that may be experienced on outstanding loans at the balance sheet date based on the evaluation of the size and current risk characteristics of the loan portfolio, past events, current conditions, reasonable and supportable forecasts of future economic conditions and prepayment experience. The allowance for credit losses is measured and recorded upon the initial recognition of a financial asset. Determination of the adequacy of the allowance is inherently complex and requires the use of significant and highly subjective estimates. Loans are charged-off against the allowance when deemed uncollectible by management. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. Adjustments to the allowance are reported in our income statement as a component of the provision for credit losses. Management has made the accounting policy election to exclude accrued interest receivable on loans from the estimate of credit losses. The Company’s methodology for estimating the allowance includes: (1) a collective quantified reserve that reflects the Company’s historical default and loss experience adjusted for expected economic conditions throughout a reasonable and supportable period and the Company’s prepayment and curtailment rates; (2) collective qualitative factors based on the risk perceived in concentrations of the loan portfolio, changes in economic conditions, early delinquencies, and factors related to credit administrations, including, among others, underwriting standards, loan-to-value ratios, and borrowers’ risk rating; and (3) individual allowances on loans where borrowers are experiencing financial difficulty or when the Company determines that the foreclosure is probable. In calculating the allowance for credit losses, most loans are segmented into pools based upon similar characteristics and risk profiles. Common characteristics and risk profiles include the type/purpose of loan, underlying collateral, geographical similarity and historical/expected credit loss patterns. In developing these loan pools for the purposes of modeling expected credit losses, we also analyzed the degree of correlation in how loans within each portfolio respond when subjected to varying economic conditions and scenarios as well as other portfolio stress factors. For modeling purposes, our loan portfolio segments include C&I, Municipal, Agricultural, Construction and Development, Farm, Non-Owner Occupied and Owner Occupied CRE, Residential, Consumer Auto and Consumer Non-Auto. We periodically reassess each pool to ensure the loans within the pool continue to share similar characteristics and risk profiles and to determine whether further segmentation is necessary. Refer to Note 3 for more details on the Company’s portfolio segments. The Company applies two methodologies to estimate the allowance on its pooled portfolio segments; discounted cash flows method and weighted average remaining life method. Allowance estimates on the following portfolio segments are calculated using the discounted cash flows method: C&I, Municipal, Construction and Development, Farm, Non-Owner Occupied and Owner Occupied CRE and Residential. Allowance estimates on the following portfolio segments are calculated using the remaining life method: Agriculture, Consumer Auto and Consumer Non-Auto. The models related to these methodologies utilize the Company’s historical default and loss experience adjusted for future economic forecasts. The reasonable and supportable forecast period represents a one-year economic outlook for the applicable economic variables. Following the end of the reasonable and supportable forecast period, expected losses revert back to the historical mean over the next two years on a straight-line basis. Economic variables that have the most significant impact on the allowance include: Texas unemployment rate, Texas house price index and Texas retail sales index. Contractual loan level cash flows within the discounted cash flows methodology are adjusted for the Company’s historical prepayment and curtailment rate experience. In some cases, management may determine that an individual loan exhibits unique risk characteristics which differentiate the loan from other loans within our loan pools. In such cases, the loans are evaluated for expected credit losses on an individual basis and excluded from the collective evaluation. Specific allocations of the allowance for credit losses are determined by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies, the relative risk rating of the loan and economic conditions affecting the borrower’s industry, among other things. A loan is considered to be collateral dependent when, based upon management’s assessment, the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale of the collateral. In such cases, expected credit losses are based on the fair value of the collateral at the measurement date, adjusted for estimated selling costs if satisfaction of the loan depends on the sale of the collateral. We reevaluate the fair value of collateral supporting collateral dependent loans on an ongoing basis. Management qualitatively adjusts model results for risk factors that are not considered within our modeling processes but are nonetheless relevant in assessing the expected credit losses within our loan pools. These qualitative factor (“Q-Factor”) adjustments may increase management’s estimate of expected credit losses based upon the estimated level of risk within the risk factor. The various risk factors that may be considered in making Q-Factor adjustments include, among other things, the impact of (i) changes in lending policies and procedures, including changes in underwriting standards and practices for collections, write-offs, and recoveries, (ii) actual and expected changes in national, regional, and local economic and business conditions and developments that affect the collectability of the loan pools, (iii) changes in the nature, volume and size of a loan or the loan pools and in the terms of the underlying loans, (iv) changes in the experience, ability, and depth of our lending management and staff, (v) changes in volume and severity of past due financial assets, the volume of nonaccrual assets, and the volume and severity of adversely classified or graded assets, (vi) changes in the quality of our credit review function, (vii) changes in the value of the underlying collateral for loans that are non-collateral dependent, (viii) the existence, growth, and effect of any concentrations of credit, and (ix) other factors such as the regulatory, legal and technological environments, competition, and events such as natural disasters or health pandemics. Management believes it uses relevant information available to make determinations about the allowance and that it has established the existing allowance in accordance with GAAP. However, the determination of the allowance requires significant judgment, and estimates of expected lifetime losses in the loan portfolio can vary significantly from the amounts actually observed. While management uses available information to recognize expected losses, future additions to the allowance may be necessary based on changes in the loans comprising the portfolio, changes in the current and forecasted economic conditions, changes to the interest rate environment which may directly impact prepayment and curtailment rate assumptions, and changes in the financial condition of borrowers. Allowance for Credit Losses - Off-Balance-Sheet/Reserve for Unfunded Commitments The allowance for credit losses on off-balance-sheet credit exposures is a liability account, calculated in accordance with ASC 326, representing expected credit losses over the contractual period for which we are exposed to credit risk resulting from a contractual obligation to extend credit. These obligations include unfunded lines of credit, commitments to extend credit and federal funds sold to correspondent banks and standby letters of credit. No allowance is recognized if we have the unconditional right to cancel the obligation. The allowance is reported as a component of accrued interest payable and other liabilities in our consolidated balance sheets. Adjustments to the allowance are reported in our income statement as a component of the provision for credit losses. At September 30, 2024, the Company’s reserve for unfunded commitments totaled $ 8,004,000 . The reserve for unfunded commitments totaled $ 7,903,000 at both September 30, 2023 and December 31, 2023 , respectively. The reserve for unfunded commitments is included in other liabilities in the consolidated balance sheet. Other Real Estate Other real estate owned is foreclosed property held pending disposition and is initially recorded at fair value, less estimated costs to sell, and is included in other assets in the consolidated balance sheet. At foreclosure, if the fair value of the real estate, less estimated costs to sell, is less than the Company’s recorded investment in the related loan, a write-down is recognized through a charge to the ACL. Any subsequent reduction in value is recognized by a charge to income. Operating and holding expenses of such properties, net of related income, and gains/losses on their disposition are included in net gain (loss) on sale of foreclosed assets as incurred. Bank Premises and Equipment Bank premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed principally on a straight-line basis over the estimated useful lives of the related assets. Leasehold improvements are amortized over the life of the respective lease or the estimated useful lives of the improvements, whichever is shorter. Business Combinations, Goodwill and Other Intangible Assets The Company accounts for all business combinations under the purchase method of accounting. Tangible and intangible assets and liabilities of the acquired entity are recorded at fair value. Intangible assets with finite useful lives represent the future benefit associated with the acquisition of the core deposits and are amortized over seven years , utilizing a method that approximates the expected attrition of the deposits. Goodwill with an indefinite life is not amortized, but rather tested annually for impairment as of June 30 each year. There was no impairment recorded during the nine-months ended September 30, 2024 or 2023 , respectively. Securities Sold Under Agreements to Repurchase Securities sold under agreements to repurchase, which are classified as borrowings, generally mature within one to four days from the transaction date. Securities sold under agreements to repurchase are reflected at the amount of the cash received in connection with the transaction. The Company may be required to provide additional collateral based on the estimated fair value of the underlying securities. Segment Reporting The Company has determined that its banking regions meet the aggregation criteria of the current authoritative accounting guidance since each of its banking regions offer similar products and services, operate in a similar manner, have similar customers and report to the same regulatory authority, and therefore operate one line of business (community banking) located in a single geographic area (Texas). Statements of Cash Flows For purposes of reporting cash flows, cash and cash equivalents includes cash on hand, amounts due from banks, including interest-bearing deposits in banks with original maturity of 90 days or less , and federal funds sold. Accumulated Other Comprehensive Earnings (Loss) Unrealized net losses on the Company’s available-for-sale securities, net of applicable income taxes, totaled $ 329,817,000 , $ 639,934,000 and $ 403,298,000 at September 30, 2024, and 2023, and December 31, 2023 , respectively, are included in accumulated other comprehensive earnings (loss) as a separate component of shareholders' equity. Income Taxes The Company’s provision for income taxes is based on income before income taxes adjusted for permanent differences between financial reporting and taxable income. Deferred tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the temporary differences between the book and tax bases of the various balance sheet assets and liabili

Securities

Securities	9 Months Ended
	Sep. 30, 2024
Cash and Cash Equivalents [Abstract]
Securities	Note 2 - Securities Debt securities have been classified in the consolidated balance sheets according to management’s intent. The amortized cost, related gross unrealized gains and losses, allowance for credit losses and the fair value of available-for-sale securities are as follows (dollars in thousands): September 30, 2024 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 298,671 $ 14 $ ( 5,671 ) $ 293,014 Obligations of states and political subdivisions 1,586,300 699 ( 115,516 ) 1,471,483 Residential mortgage-backed securities 2,712,305 1,655 ( 290,030 ) 2,423,930 Commercial mortgage-backed securities 320,685 1,946 ( 5,795 ) 316,836 Corporate bonds and other 112,163 59 ( 5,186 ) 107,036 Total securities available-for-sale $ 5,030,124 $ 4,373 $ ( 422,198 ) $ 4,612,299 September 30, 2023 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 507,549 $ — $ ( 22,102 ) $ 485,447 Obligations of states and political subdivisions 1,726,947 120 ( 263,313 ) 1,463,754 Residential mortgage-backed securities 2,792,813 — ( 495,578 ) 2,297,235 Commercial mortgage-backed securities 323,539 — ( 18,191 ) 305,348 Corporate bonds and other 112,338 — ( 11,585 ) 100,753 Total securities available-for-sale $ 5,463,186 $ 120 $ ( 810,769 ) $ 4,652,537 December 31, 2023 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 496,975 $ 4 $ ( 14,745 ) $ 482,234 Obligations of states and political subdivisions 1,621,405 934 ( 125,182 ) 1,497,157 Residential mortgage-backed securities 2,716,968 7 ( 352,883 ) 2,364,092 Commercial mortgage-backed securities 295,663 — ( 11,339 ) 284,324 Corporate bonds and other 112,670 — ( 7,715 ) 104,955 Total securities available-for-sale $ 5,243,681 $ 945 $ ( 511,864 ) $ 4,732,762 The Company did no t hold any securities classified as held-to-maturity at September 30, 2024, September 30, 2023, or December 31, 2023. The Company invests in mortgage-backed securities that have expected maturities that differ from their contractual maturities. These differences arise because borrowers may have the right to call or prepay obligations with or without a prepayment penalty. These securities include collateralized mortgage obligations (CMOs) and other asset backed securities. The expected maturities of these securities at September 30, 2024 and 2023, and December 31, 2023, were computed by using scheduled amortization of balances and historical prepayment rates. The carrying value and estimated fair value of available-for-sale securities at September 30, 2024, by contractual and expected maturity, are shown below (dollars in thousands): Carrying Estimated Value Fair Value Due within one year $ 281,764 $ 278,517 Due after one year through five years 1,758,382 1,662,649 Due after five years through ten years 2,167,043 1,955,247 Due after ten years 822,935 715,886 Total $ 5,030,124 $ 4,612,299 The following tables disclose as of September 30, 2024 and 2023, and December 31, 2023 , the Company’s investment securities that have been in a continuous unrealized-loss position for less than 12 months and for 12 or more months (dollars in thousands): Less than 12 Months 12 Months or Longer Total September 30, 2024 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ — $ — $ 290,535 $ 5,671 $ 290,535 $ 5,671 Obligations of states and political subdivisions 6,899 43 1,395,597 115,473 $ 1,402,496 $ 115,516 Residential mortgage-backed securities 124,439 335 2,205,425 289,695 $ 2,329,864 $ 290,030 Commercial mortgage-backed securities 7,118 32 209,632 5,763 $ 216,750 $ 5,795 Corporate bonds and other — — 97,183 5,186 $ 97,183 $ 5,186 Total $ 138,456 $ 410 $ 4,198,372 $ 421,788 $ 4,336,828 $ 422,198 Less than 12 Months 12 Months or Longer Total September 30, 2023 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 4,867 $ 49 $ 480,580 $ 22,053 $ 485,447 $ 22,102 Obligations of states and political subdivisions 53,029 2,568 1,402,097 260,745 1,455,126 263,313 Residential mortgage-backed securities 3,123 106 2,294,112 495,472 2,297,235 495,578 Commercial mortgage-backed securities 1,274 87 304,074 18,104 305,348 18,191 Corporate bonds and other — — 100,753 11,585 100,753 11,585 Total $ 62,293 $ 2,810 $ 4,581,616 $ 807,959 $ 4,643,909 $ 810,769 Less than 12 Months 12 Months or Longer Total December 31, 2023 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 3,477 $ 7 $ 477,306 $ 14,738 $ 480,783 $ 14,745 Obligations of states and political subdivisions 11,855 34 1,427,975 125,148 1,439,830 125,182 Residential mortgage-backed securities 1,631 1 2,361,089 352,882 2,362,720 352,883 Commercial mortgage-backed securities — — 284,324 11,339 284,324 11,339 Corporate bonds and other — — 104,955 7,715 104,955 7,715 Total $ 16,963 $ 42 $ 4,655,649 $ 511,822 $ 4,672,612 $ 511,864

Loans Held for Investment and A

Loans Held for Investment and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Loans Held for Investment and Allowance for Credit Losses	Note 3 – Loans Held-for-Investment and Allowance for Credit Losses For the periods ended September 30, 2024 and 2023, and December 31, 2023, the following tables outline the Company’s loan portfolio by the ten portfolio segments where applicable. Loans held-for-investment by portfolio segment are as follows (dollars in thousands): September 30, December 31, 2024 2023 2023 Commercial: C&I $ 1,175,774 $ 1,108,240 $ 1,164,811 Municipal 333,732 218,358 214,850 Total Commercial 1,509,506 1,326,598 1,379,661 Agricultural 83,269 81,876 84,890 Real Estate: Construction & Development 1,013,810 929,570 963,158 Farm 315,720 341,052 344,954 Non-Owner Occupied CRE 825,928 828,900 827,969 Owner Occupied CRE 1,086,750 1,002,913 1,037,281 Residential 2,112,196 1,788,913 1,834,593 Total Real Estate 5,354,404 4,891,348 5,007,955 Consumer: Auto 618,103 540,382 521,859 Non-Auto 157,909 154,492 154,426 Total Consumer 776,012 694,874 676,285 Total Loans 7,723,191 6,994,696 7,148,791 Less: Allowance for credit losses ( 99,936 ) ( 89,714 ) ( 88,734 ) Loans, net $ 7,623,255 $ 6,904,982 $ 7,060,057 Outstanding loan balances at September 30, 2024 and 2023, and December 31, 2023, are net of unearned income, including net deferred loan fees. At September 30, 2024, $ 5,256,833,000 in loans held by our bank subsidiary were subject to blanket liens as security for a line of credit with the Federal Home Loan Bank of Dallas ("FHLB"). At September 30, 2024, this available line of credit was $ 2,196,671,000 . At September 30, 2024, there was $ 641,500,000 used on the line advance for undisbursed commitments (letters of credit) used to secure public funds. The Company’s nonaccrual loans and loans still accruing and past due 90 days or more are as follows (dollars in thousands): September 30, December 31, 2024 2023 2023 Nonaccrual loans $ 63,378 $ 38,812 $ 33,609 Loans still accruing and past due 90 days or more 504 289 1,004 Total nonperforming loans $ 63,882 $ 39,101 $ 34,613 The Company had $ 64,417,000 , $ 39,698,000 and $ 35,096,000 in nonaccrual, past due 90 days or more and still accruing, and foreclosed assets at September 30, 2024 and 2023, and December 31, 2023 , respectively. Nonaccrual loans at September 30, 2024 and 2023, and December 31, 2023, consisted of the following (dollars in thousands): September 30, December 31, 2024 2023 2023 Commercial: C&I $ 3,952 $ 3,365 $ 4,132 Municipal — — — Total Commercial 3,952 3,365 4,132 Agricultural 2,088 838 155 Real Estate: Construction & Development 1,617 3,295 1,444 Farm 4,738 5,534 4,804 Non-Owner Occupied CRE 12,787 8,407 8,022 Owner Occupied CRE 29,411 7,812 6,822 Residential 7,741 8,990 7,649 Total Real Estate 56,294 34,038 28,741 Consumer: Auto 546 465 464 Non-Auto 498 106 117 Total Consumer 1,044 571 581 Total $ 63,378 $ 38,812 $ 33,609 No significant additional funds are committed to be advanced in connection with nonaccrual loans as of September 30, 2024. Summary information on the allowance for credit losses for the three and nine-months ended September 30, 2024 and 2023, are outlined by portfolio segment in the following tables (dollars in thousands): Three-Months Ended September 30, 2024 C&I Municipal Agricultural Construction Farm Beginning balance $ 15,251 $ 239 $ 1,931 $ 23,511 $ 2,902 Provision for loan losses 1,665 ( 42 ) 294 ( 3,164 ) 272 Recoveries 257 — 8 — — Charge-offs ( 398 ) — ( 8 ) — — Ending balance $ 16,775 $ 197 $ 2,225 $ 20,347 $ 3,174 Three-Months Ended September 30, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 13,028 $ 21,054 $ 15,668 $ 1,073 $ 513 $ 95,170 Provision for loan losses 869 1,827 3,243 321 267 5,552 Recoveries 3 38 — 145 42 493 Charge-offs — — ( 174 ) ( 428 ) ( 271 ) ( 1,279 ) Ending balance $ 13,900 $ 22,919 $ 18,737 $ 1,111 $ 551 $ 99,936 Three-Months Ended September 30, 2023 C&I Municipal Agricultural Construction Farm Beginning balance $ 16,530 $ 187 $ 1,082 $ 28,966 $ 2,804 Provision for loan losses ( 64 ) ( 2 ) 53 ( 696 ) 131 Recoveries 56 — 21 6 — Charge-offs ( 715 ) — — — — Ending balance $ 15,807 $ 185 $ 1,156 $ 28,276 $ 2,935 Three-Months Ended September 30, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 13,471 $ 12,572 $ 9,767 $ 829 $ 333 $ 86,541 Provision for loan losses 2,330 767 1,035 172 95 3,821 Recoveries 16 187 3 96 47 432 Charge-offs — — ( 7 ) ( 235 ) ( 123 ) ( 1,080 ) Ending balance $ 15,817 $ 13,526 $ 10,798 $ 862 $ 352 $ 89,714 Nine-Months Ended September 30, 2024 C&I Municipal Agricultural Construction Farm Beginning balance $ 15,698 $ 195 $ 1,281 $ 28,553 $ 2,914 Provision for loan losses 1,376 2 952 ( 8,173 ) 260 Recoveries 545 — 59 — — Charge-offs ( 844 ) — ( 67 ) ( 33 ) — Ending balance $ 16,775 $ 197 $ 2,225 $ 20,347 $ 3,174 Nine-Months Ended September 30, 2024 (continued) Non-Owner Owner Residential Auto Non- Total Beginning balance $ 13,425 $ 13,813 $ 11,654 $ 810 $ 391 $ 88,734 Provision for loan losses 454 8,988 7,168 1,111 580 12,718 Recoveries 34 118 100 346 113 1,315 Charge-offs ( 13 ) — ( 185 ) ( 1,156 ) ( 533 ) ( 2,831 ) Ending balance $ 13,900 $ 22,919 $ 18,737 $ 1,111 $ 551 $ 99,936 Nine-Months Ended September 30, 2023 C&I Municipal Agricultural Construction Farm Beginning balance $ 16,129 $ 1,026 $ 1,041 $ 26,443 $ 1,957 Provision for loan losses 860 ( 841 ) ( 128 ) 1,727 978 Recoveries 221 — 243 106 — Charge-offs ( 1,403 ) — — — — Ending balance $ 15,807 $ 185 $ 1,156 $ 28,276 $ 2,935 Nine-Months Ended September 30, 2023 (continued) Non-Owner Owner Residential Auto Non- Total Beginning balance $ 9,075 $ 9,928 $ 9,075 $ 845 $ 315 $ 75,834 Provision for loan losses 6,679 3,390 1,826 341 218 15,050 Recoveries 63 208 18 329 128 1,316 Charge-offs — — ( 121 ) ( 653 ) ( 309 ) ( 2,486 ) Ending balance $ 15,817 $ 13,526 $ 10,798 $ 862 $ 352 $ 89,714 Additionally, the Company records a reserve for unfunded commitments in other liabilities, which totaled $ 8,004,000 , $ 7,903,000 and $ 7,903,000 at September 30, 2024 and 2023, and December 31, 2023, respectively. The provision for loan losses of $ 5,552,000 for the three-months ended September 30, 2024 is combined with the provision for unfunded commitments of $ 571,000 and reported in the net aggregate of $ 6,123,000 under the provision for credit losses in the consolidated statement of earnings for the three-months ended September 30, 2024. The provision for loan losses of $ 12,718,000 for the nine-months ended September 30, 2024 is combined with the provision for unfunded commitments of $ 101,000 and reported in the net aggregate of $ 12,817,000 under the provision for credit losses in the consolidated statement of earnings for the nine-months ended September 30, 2024. The $ 3,821,000 provision for loan losses for the three-months ended September 30, 2023 above is combined with the reversal of provision for unfunded commitments of $ 1,545,000 and reported in the aggregate of $ 2,276,000 under the provision for credit losses for the three-months ended September 30, 2023. The $ 15,050,000 provision for loan losses for the nine-months ended September 30, 2023 above is combined with the reversal of provision for unfunded commitments of $ 4,419,000 and reported in the aggregate of $ 10,631,000 under the provision for credit losses for the nine-months ended September 30, 2023. The Company’s loans that are ind ividually evaluated for credit losses (both collateral and non-collateral dependent) and their related allowances as of September 30, 2024 and 2023, and December 31, 2023, are summarized in the following tables by loan segment (dollars in thousands): September 30, 2024 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 1,137 $ 2,815 $ 21,285 $ 25,237 $ 1,430 $ 3,921 $ 5,351 Municipal — — 373 373 — — — Total Commercial 1,137 2,815 21,658 25,610 1,430 3,921 5,351 Agricultural 278 1,810 1,150 3,238 1,092 636 1,728 Real Estate: Construction & Development 1,091 526 8,404 10,021 35 556 591 Farm 412 4,326 5,586 10,324 546 443 989 Non-Owner Occupied CRE 2,234 10,553 25,607 38,394 1,402 2,047 3,449 Owner Occupied CRE 402 29,009 57,364 86,775 6,709 2,888 9,597 Residential 4,142 3,599 43,439 51,180 644 2,373 3,017 Total Real Estate 8,281 48,013 140,400 196,694 9,336 8,307 17,643 Consumer: Auto — 546 2,562 3,108 1 4 5 Non-Auto — 498 775 1,273 87 78 165 Total Consumer — 1,044 3,337 4,381 88 82 170 Total $ 9,696 $ 53,682 $ 166,545 $ 229,923 $ 11,946 $ 12,946 $ 24,892 September 30, 2023 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 310 $ 3,055 $ 20,476 $ 23,841 $ 2,025 $ 4,651 $ 6,676 Municipal — — 1,377 1,377 — — — Total Commercial 310 3,055 21,853 25,218 2,025 4,651 6,676 Agricultural 215 623 1,278 2,116 58 594 652 Real Estate: Construction & Development 2,678 617 19,912 23,207 139 1,887 2,026 Farm 553 4,981 2,225 7,759 1,070 133 1,203 Non-Owner Occupied CRE 1,991 6,416 28,127 36,534 889 2,665 3,554 Owner Occupied CRE 5,473 2,339 34,988 42,800 400 1,635 2,035 Residential 6,059 2,931 29,453 38,443 281 1,865 2,146 Total Real Estate 16,754 17,284 114,705 148,743 2,779 8,185 10,964 Consumer: Auto — 465 1,858 2,323 1 3 4 Non-Auto — 106 599 705 — 2 2 Total Consumer — 571 2,457 3,028 1 5 6 Total $ 17,279 $ 21,533 $ 140,293 $ 179,105 $ 4,863 $ 13,435 $ 18,298 December 31, 2023 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 1,322 $ 2,810 $ 18,633 $ 22,765 $ 1,363 $ 4,495 $ 5,858 Municipal — — 733 733 — — — Total Commercial 1,322 2,810 19,366 23,498 1,363 4,495 5,858 Agricultural 57 98 1,304 1,459 50 700 750 Real Estate: Construction & Development 758 686 22,545 23,989 148 2,253 2,401 Farm — 4,804 1,362 6,166 937 57 994 Non-Owner Occupied CRE 1,919 6,103 29,117 37,139 700 2,984 3,684 Owner Occupied CRE 4,661 2,161 35,746 42,568 232 1,431 1,663 Residential 3,909 3,740 30,257 37,906 360 1,799 2,159 Total Real Estate 11,247 17,494 119,027 147,768 2,377 8,524 10,901 Consumer: Auto — 464 2,125 2,589 1 3 4 Non-Auto — 117 782 899 — 60 60 Total Consumer — 581 2,907 3,488 1 63 64 Total $ 12,626 $ 20,983 $ 142,604 $ 176,213 $ 3,791 $ 13,782 $ 17,573 The Company’s allowance for loans that are individually evaluated for credit losses and collectively evaluated for credit losses as of September 30, 2024 and 2023, and December 31, 2023, are summarized in the following table by loan segment (dollars in thousands). Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. September 30, 2024 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 5,351 $ — $ 1,728 $ 591 $ 989 Loans collectively evaluated for credit losses 11,424 197 497 19,756 2,185 Total $ 16,775 $ 197 $ 2,225 $ 20,347 $ 3,174 September 30, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,449 $ 9,597 $ 3,017 $ 5 $ 165 $ 24,892 Loans collectively evaluated for credit losses 10,451 13,322 15,720 1,106 386 75,044 Total $ 13,900 $ 22,919 $ 18,737 $ 1,111 $ 551 $ 99,936 September 30, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 6,676 $ — $ 652 $ 2,026 $ 1,203 Loans collectively evaluated for credit losses 9,131 185 504 26,250 1,732 Total $ 15,807 $ 185 $ 1,156 $ 28,276 $ 2,935 September 30, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,554 $ 2,035 $ 2,146 $ 4 $ 2 $ 18,298 Loans collectively evaluated for credit losses 12,263 11,491 8,652 858 350 71,416 Total $ 15,817 $ 13,526 $ 10,798 $ 862 $ 352 $ 89,714 December 31, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 5,858 $ — $ 750 $ 2,401 $ 994 Loans collectively evaluated for credit losses 9,840 195 531 26,152 1,920 Total $ 15,698 $ 195 $ 1,281 $ 28,553 $ 2,914 December 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,684 $ 1,663 $ 2,159 $ 4 $ 60 $ 17,573 Loans collectively evaluated for credit losses 9,741 12,150 9,495 806 331 71,161 Total $ 13,425 $ 13,813 $ 11,654 $ 810 $ 391 $ 88,734 The Company’s recorded investment in loans as of September 30, 2024 and 2023, and December 31, 2023, related to the balance in the allowance for credit losses follows below (dollars in thousands): September 30, 2024 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 25,237 $ 373 $ 3,238 $ 10,021 $ 10,324 Loans collectively evaluated for credit losses 1,150,537 333,359 80,031 1,003,789 305,396 Total $ 1,175,774 $ 333,732 $ 83,269 $ 1,013,810 $ 315,720 September 30, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 38,394 $ 86,775 $ 51,180 $ 3,108 $ 1,273 $ 229,923 Loans collectively evaluated for credit losses 787,534 999,975 2,061,016 614,995 156,636 7,493,268 Total $ 825,928 $ 1,086,750 $ 2,112,196 $ 618,103 $ 157,909 $ 7,723,191 September 30, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 23,841 $ 1,377 $ 2,116 $ 23,207 $ 7,759 Loans collectively evaluated for credit losses 1,084,399 216,981 79,760 906,363 333,293 Total $ 1,108,240 $ 218,358 $ 81,876 $ 929,570 $ 341,052 September 30, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 36,534 $ 42,800 $ 38,443 $ 2,323 $ 705 $ 179,105 Loans collectively evaluated for credit losses 792,366 960,113 1,750,470 538,059 153,787 6,815,591 Total $ 828,900 $ 1,002,913 $ 1,788,913 $ 540,382 $ 154,492 $ 6,994,696 December 31, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 22,765 $ 733 $ 1,459 $ 23,989 $ 6,166 Loans collectively evaluated for credit losses 1,142,046 214,117 83,431 939,169 338,788 Total $ 1,164,811 $ 214,850 $ 84,890 $ 963,158 $ 344,954 December 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 37,139 $ 42,568 $ 37,906 $ 2,589 $ 899 $ 176,213 Loans collectively evaluated for credit losses 790,830 994,713 1,796,687 519,270 153,527 6,972,578 Total $ 827,969 $ 1,037,281 $ 1,834,593 $ 521,859 $ 154,426 $ 7,148,791 From a credit risk standpoint, the Company rates its loans in one of five categories: (i) pass, (ii) special mention, (iii) substandard, (iv) doubtful or (v) loss (which are charged-off). The ratings of loans reflect a judgment about the risks of default and loss associated with the loan. The Company reviews the ratings on our credits as part of our ongoing monitoring of the credit quality of our loan portfolio. Ratings are adjusted to reflect the degree of risk and loss that are felt to be inherent in each credit as of each reporting period. Our methodology is structured so that specific allocations are increased in accordance with deterioration in credit quality (and a corresponding increase in risk and loss) or decreased in accordance with improvement in credit quality (and a corresponding decrease in risk and loss). Credits rated special mention show clear signs of financial weaknesses or deterioration in credit worthiness, however, such concerns are not so pronounced that the Company generally expects to experience significant loss within the short-term. Such credits typically maintain the ability to perform within standard credit terms and credit exposure is not as prominent as credits rated more harshly. Credits rated substandard are those in which the normal repayment of principal and interest may be, or has been, jeopardized by reason of adverse trends or developments of a financial, managerial, economic or political nature, or important weaknesses exist in collateral. A protracted workout on these credits is a distinct possibility. Prompt corrective action is therefore required to strengthen the Company’s position, and/or to reduce exposure and to assure that adequate remedial measures are taken by the borrower. Credit exposure becomes more likely in such credits and a serious evaluation of the secondary support to the credit is performed. Credits rated doubtful are those in which full collection of principal appears highly questionable, and which some degree of loss is anticipated, even though the ultimate amount of loss may not yet be certain and/or other factors exist which could affect collection of debt. Based upon available information, positive action by the Company is required to avert or minimize loss. Credits rated doubtful are generally also placed on nonaccrual. The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at September 30, 2024 (dollars in millions): September 30, 2024 2023 2022 2021 2020 Prior Revolving Total C&I Risk rating: Pass $ 533 $ 331 $ 175 $ 57 $ 25 $ 30 $ — $ 1,151 Special mention 9 1 — — — — — 10 Substandard 5 3 3 1 1 2 — 15 Doubtful — — — — — — — — Total $ 547 $ 335 $ 178 $ 58 $ 26 $ 32 $ — $ 1,176 Year-to-Date Gross Charge-Offs $ — $ 1 $ — $ — $ — $ — $ — $ 1 September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Municipal Risk rating: Pass $ 131 $ 29 $ 79 $ 13 $ 9 $ 73 $ — $ 334 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 131 $ 29 $ 79 $ 13 $ 9 $ 73 $ — $ 334 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Agricultural Risk rating: Pass $ 53 $ 19 $ 5 $ 2 $ 1 $ — $ — $ 80 Special mention — — — — — — — — Substandard 3 — — — — — — 3 Doubtful — — — — — — — — Total $ 56 $ 19 $ 5 $ 2 $ 1 $ — $ — $ 83 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Construction & Development Risk rating: Pass $ 513 $ 227 $ 180 $ 57 $ 17 $ 9 $ 1 $ 1,004 Special mention 2 — — — — — — 2 Substandard 5 2 1 — — — — 8 Doubtful — — — — — — — — Total $ 520 $ 229 $ 181 $ 57 $ 17 $ 9 $ 1 $ 1,014 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Farm Risk rating: Pass $ 76 $ 44 $ 76 $ 65 $ 20 $ 25 $ — $ 306 Special mention — — — — — — — — Substandard — 1 4 — 4 1 — 10 Doubtful — — — — — — — — Total $ 76 $ 45 $ 80 $ 65 $ 24 $ 26 $ — $ 316 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 147 $ 91 $ 244 $ 155 $ 60 $ 91 $ — $ 788 Special mention 1 — — 1 — 1 — 3 Substandard 3 3 1 7 6 15 — 35 Doubtful — — — — — — — — Total $ 151 $ 94 $ 245 $ 163 $ 66 $ 107 $ — $ 826 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 128 $ 138 $ 279 $ 185 $ 104 $ 166 $ — $ 1,000 Special mention 2 5 — 5 1 1 — 14 Substandard 2 4 42 13 1 11 — 73 Doubtful — — — — — — — — Total $ 132 $ 147 $ 321 $ 203 $ 106 $ 178 $ — $ 1,087 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Residential Risk rating: Pass $ 448 $ 392 $ 392 $ 278 $ 136 $ 246 $ 167 $ 2,059 Special mention 2 1 1 2 — 2 — 8 Substandard 4 7 12 3 4 11 4 45 Doubtful — — — — — — — — Total $ 454 $ 400 $ 405 $ 283 $ 140 $ 259 $ 171 $ 2,112 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Auto Risk rating: Pass $ 271 $ 137 $ 144 $ 45 $ 14 $ 4 $ — $ 615 Special mention — — — — — — — — Substandard — 1 1 1 — — — 3 Doubtful — — — — — — — — Total $ 271 $ 138 $ 145 $ 46 $ 14 $ 4 $ — $ 618 Year-to-Date Gross Charge-Offs $ — $ — $ 1 $ — $ — $ — $ — $ 1 September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Non-Auto Risk rating: Pass $ 59 $ 42 $ 31 $ 15 $ 2 $ 1 $ 7 $ 157 Special mention — — — — — — — — Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 59 $ 42 $ 32 $ 15 $ 2 $ 1 $ 7 $ 158 Year-to-Date Gross Charge-Offs $ — $ — $ 1 $ — $ — $ — $ — $ 1 September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Total Loans Risk rating: Pass $ 2,359 $ 1,450 $ 1,605 $ 872 $ 388 $ 645 $ 175 $ 7,494 Special mention 16 7 1 8 1 4 — 37 Substandard 22 21 65 25 16 40 4 193 Doubtful — — — — — — — — Total $ 2,397 $ 1,478 $ 1,671 $ 905 $ 405 $ 689 $ 179 $ 7,724 Year-to-Date Gross Charge-Offs $ — $ 1 $ 2 $ — $ — $ — $ — $ 3 The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at September 30, 2023 (dollars in millions): September 30, 2023 2022 2021 2020 2019 Prior Revolving Total C&I Risk rating: Pass $ 524 $ 386 $ 94 $ 40 $ 16 $ 24 $ — $ 1,084 Special mention 7 1 — — 1 — — 9 Substandard 2 5 3 2 1 2 — 15 Doubtful — — — — — — — — Total $ 533 $ 392 $ 97 $ 42 $ 18 $ 26 $ — $ 1,108 Year-to-Date Gross Charge-Offs $ — $ — $ 1 $ — $ — $ — $ — $ 1 September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Municipal Risk rating: Pass $ 20 $ 83 $ 16 $ 14 $ 2 82 $ — $ 217 Special mention — — — — — — — — Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 20 $ 83 $ 17 $ 14 $ 2 $ 82 $ — $ 218 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Agricultural Risk rating: Pass $ 42 $ 30 $ 5 $ 2 $ 1 — $ — $ 80 Special mention — — — — — — — — Substandard 1 1 — — — — — 2 Doubtful — — — — — — — — Total $ 43 $ 31 $ 5 $ 2 $ 1 $ — $ — $ 82 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Construction & Development Risk rating: Pass $ 373 $ 401 $ 94 $ 22 $ 10 $ 7 $ — $ 907 Special mention 7 4 — — — — — 11 Substandard 8 3 1 — — — — 12 Doubtful — — — — — — — — Total $ 388 $ 408 $ 95 $ 22 $ 10 $ 7 $ — $ 930 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Farm Risk rating: Pass $ 83 $ 116 $ 75 $ 25 $ 9 $ 25 $ — $ 333 Special mention — — — — — — — — Substandard — 1 1 5 — 1 — 8 Doubtful — — — — — — — — Total $ 83 $ 117 $ 76 $ 30 $ 9 $ 26 $ — $ 341 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 134 $ 240 $ 182 $ 116 $ 45 $ 75 $ — $ 792 Special mention — 4 1 — 11 2 — 18 Substandard 1 1 1 7 2 7 — 19 Doubtful — — — — — — — — Total $ 135 $ 245 $ 184 $ 123 $ 58 $ 84 $ — $ 829 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 81 $ 320 $ 228 $ 118 $ 64 $ 149 $ — $ 960 Special mention 1 — 5 — 3 — — 9 Substandard 3 6 4 — 5 16 — 34 Doubtful — — — — — — — — Total $ 85 $ 326 $ 237 $ 118 $ 72 $ 165 $ — $ 1,003 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Residential Risk rating: Pass $ 368 $ 443 $ 325 $ 165 $ 70 $ 241 $ 139 $ 1,751 Special mention — 2 2 2 — 3 1 10 Substandard 4 5 4 3 2 8 2 28 Doubtful — — — — — — — — Total $ 372 $ 450 $ 331 $ 170 $ 72 $ 252 $ 142 $ 1,789 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Auto Risk rating: Pass $ 168 $ 237 $ 86 $ 32 $ 13 $ 2 $ — $ 538 Special mention — — — — — — — — Substandard — 1 1 — — — — 2 Doubtful — — — — — — — — Total $ 168 $ 238 $ 87 $ 32 $ 13 $ 2 $ — $ 540 Year-to-Date Gross Charge-Offs $ — $ 1 $ — $ — $ — $ — $ — $ 1 September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Auto Risk rating: Pass $ 60 $ 54 $ 26 $ 5 $ 1 $ 1 $ 7 $ 154 Special mention — — — — — — — — Substandard 1 — — — — — — 1 Doubtful — — — — — — — — Total $ 61 $ 54 $ 26 $ 5 $ 1 $ 1 $ 7 $ 155 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Total Loans Risk rating: Pass $ 1,853 $ 2,310 $ 1,131 $ 539 $ 231 $ 606 $ 146 $ 6,816 Special mention 15 11 8 2 15 5 1 57 Substandard 20 23 16 17 10 34 2 122 Doubtful — — — — — — — — Total $ 1,888 $ 2,344 $ 1,155 $ 558 $ 256 $ 645 $ 149 $ 6,995 Year-to-Date Gross Charge-Offs $ — $ 1 $ 1 $ — $ — $ — $ — $ 2 The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at December 31, 2023 (dollars in millions): December 31, 2023 2022 2021 2020 2019 Prior Revolving Total C&I Risk rating: Pass $ 720 $ 276 $ 73 $ 36 $ 14 $ 23 $ — $ 1,142 Special mention 1 1 — — 1 — — 3 Substandard 12 2 2 1 1 2 — 20 Doubtful — — — — — — — — Total $ 733 $ 279 $ 75 $ 37 $ 16 $ 25 $ — $ 1,165 Year-to-Date Gross Charge-Offs $ — $ — $ 1 $ — $ — $ — $ — $ 1 December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Municipal Risk rating: Pass $ 25 $ 83 $ 15 $ 10 $ 1 $ 80 $ — $ 214 Special mention — — — — — — — — Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 25 $ 83 $ 16 $ 10 $ 1 $ 80 $ — $ 215 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Agricultural Risk rating: Pass $ 63 $ 15 $ 4 $ 1 $ 1 $ — $ — $ 84 Special mention — — — — — — — — Substandard 1 — — — — — — 1 Doubtful — — — — — — — — Total $ 64 $ 15 $ 4 $ 1 $ 1 $ — $ — $ 85 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Construction & Development Risk rating: Pass $ 515 $ 311 $ 78 $ 20 $ 9 $ 6 $ — $ 939 Special mention 8 2 — — — — — 10 Substandard 9 4 1 — — — — 14 Doubtful — — — — — — — — Total $ 532 $ 317 $ 79 $ 20 $ 9 $ 6 $ — $ 963 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Farm Risk rating: Pass $ 101 $ 111 $ 73 $ 24 $ 8 $ 22 $ — $ 339 Special mention — — — — — — — — Substandard — — — 5 — 1 — 6 Doubtful — — — — — — — — Total $ 101 $ 111 $ 73 $ 29 $ 8 $ 23 $ — $ 345 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 167 $ 232 $ 172 $ 106 $ 41 $ 73 $ — $ 791 Special mention — 5 1 — — 2 — 8 Substandard 2 1 2 7 13 4 — 29 Doubtful — — — — — — — — Total $ 169 $ 238 $ 175 $ 113 $ 54 $ 79 $ — $ 828 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 154 $ 305 $ 217 $ 114 $ 62 $ 142 $ — $ 994 Special mention 1 1 4 — 1 1 — 8 Substandard 3 6 4 — 7 15 — 35 Doubtful — — — — — — — — Total $ 158 $ 312 $ 225 $ 114 $ 70 $ 158 $ — $ 1,037 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Residential Risk rating: Pass $ 477 $ 415 $ 313 $ 158 $ 67 $ 229 $ 138 $ 1,797 Special mention 1 2 2 2 — 3 1 11 Substandard 4 4 3 3 3 7 3 27 Doubtful — — — — — — — — Total $ 482 $ 421 $ 318 $ 163 $ 70 $ 239 $ 142 $ 1,835 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Auto Risk rating: Pass $ 195 $ 212 $ 74 $ 26 $ 10 $ 2 $ — $ 519 Special mention — — — — — — — — Substandard — 1 1 1 — — — 3 Doubtful — — — — — — — — Total $ 195 $ 213 $ 75 $ 27 $ 10 $ 2 $ — $ 522 Year-to-Date Gross Charge-Offs $ — $ 1 $ — $ — $ — $ — $ — $ 1 December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Auto Risk rating: Pass $ 71 $ 47 $ 22 $ 4 $ 1 $ 1 $ 7 $ 153 Special mention — — — — — — — — Substandard 1 — — — — — — 1 Doubtful — — — — — — — — Total $ 72 $ 47 $ 22 $ 4 $ 1 $ 1 $ 7 $ 154 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Total Loans Risk rating: Pass $ 2,488 $ 2,007 $ 1,041 $ 499 $ 214 $ 578 $ 145 $ 6,972 Special mention 11 11 7 2 2 6 1 40 Substandard 32 18 14 17 24 29 3 137 Doubtful — — — — — — — — Total $ 2,531 $ 2,036 $ 1,062 $ 518 $ 240 $ 613 $ 149 $ 7,149 Year-to-Date Gross Charge-Offs $ — $ 1 $ 1 $ — $ — $ — $ — $ 2 At September 30, 2024 and 2023, and December 31, 2023, the Company’s past due loans are as follows (dollars in thousands): September 30, 2024 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 3,570 $ 672 $ 1,261 $ 5,503 $ 1,170,271 $ 1,175,774 $ 224 Municipal — — — — 333,732 333,732 — Total Commercial 3,570 672 1,261 5,503 1,504,003 1,509,506 224 Agricultural 192 134 1,617 1,943 81,326 83,269 — Real Estate: Construction & Development 9,116 155 911 10,182 1,003,628 1,013,810 245 Farm 777 — — 777 314,943 315,720 — Non-Owner Occupied CRE 203 87 2,682 2,972 822,956 825,928 — Owner Occupied CRE 4,045 403 1,234 5,682 1,081,068 1,086,750 — Residential 18,074 2,438 515 21,027 2,091,169 2,112,196 35 Total Real Estate 32,215 3,083 5,342 40,640 5,313,764 5,354,404 280 Consumer: Auto 964 79 43 1,086 617,017 618,103 — Non-Auto 220 212 . 432 157,477 157,909 — Total Consumer 1,184 291 43 1,518 774,494 776,012 — Total $ 37,161 $ 4,180 $ 8,263 $ 49,604 $ 7,673,587 $ 7,723,191 $ 504 September 30, 2023 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 5,111 $ 390 $ 1,388 $ 6,889 $ 1,101,351 $ 1,108,240 $ 109 Municipal 481 — — 481 217,877 218,358 — Total Commercial 5,592 390 1,388 7,370 1,319,228 1,326,598 109 Agricultural 187 — 550 737 81,139 81,876 32 Real Estate: Construction & Development 10,037 169 1,986 12,192 917,378 929,570 — Farm 706 — 205 911 340,141 341,052 — Non-Owner Occupied CRE 2,748 — — 2,748 826,152 828,900 — Owner Occupied CRE 1,867 — 476 2,343 1,000,570 1,002,913 — Residential 9,049 1,658 2,067 12,774 1,776,139 1,788,913 148 Total Real Estate 24,407 1,827 4,734 30,968 4,860,380 4,891,348 148 Consumer: Auto 339 176 32 547 539,835 540,382 — Non-Auto 217 2 9 228 154,264 154,492 — Total Consumer 556 178 41 775 694,099 694,874 — Total $ 30,742 $ 2,395 $ 6,713 $ 39,850 $ 6,954,846 $ 6,994,696 $ 289 December 31, 2023 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 8,789 $ 1,624 $ 1,700 $ 12,113 $ 1,152,698 $ 1,164,811 $ 141 Municipal 102 — — 102 214,748 214,850 — Total Commercial 8,891 1,624 1,700 12,215 1,367,446 1,379,661 141 Agricultural 850 246 4 1,100 83,790 84,890 — Real Estate: Construction & Development 8,887 2,115 1,856 12,858 950,300 963,158 863 Farm 1,024 195 — 1,219 343,735 344,954 — Non-Owner Occupied CRE 3,565 — — 3,565 824,404 827,969 — Owner Occupied CRE 2,818 240 1,823 4,881 1,032,400 1,037,281 — Residential 12,293 828 2,816 15,937 1,818,656 1,834,593 — Total Real Estate 28,587 3,378 6,495 38,460 4,969,495 5,007,955 863 Consumer: Auto 1,482 251 24 1,757 520,102 521,859 — Non-Auto 341 51 — 392 154,034 154,426 — Total Consumer 1,823 302 24 2,149 674,136 676,285 — Total $ 40,151 $ 5,550 $ 8,223 $ 53,924 $ 7,094,867 $ 7,148,791 $ 1,004 * The Company monitors commercial, agricultural and real estate loans after such loans are 15 days past due. Consumer loans are monitored after such loans are 30 days past due. Modifications of receivables to debtors experiencing financial difficulty On January 1, 2023, the Company adopted the accounting guidance in ASU 2022-02, which eliminates the recognition and measurement of a troubled debt restructuring ("TDR). Due to the removal of the TDR designation, the Company evaluates all loan restructurings according to the accounting guidance for loan modifications to determine if the restructuring results in a new loan or a continuation of the existing loan. Loan modifications to borrowers experiencing financial difficulty that result in a direct change in the timing or amount of contractual cash flows include situations where there is principal forgiveness, term extensions, interest rate reduction, and combinations of the listed modifications. Therefore, the disclosures related to loan restructurings are only for modifications that directly affect cash flows. An assessment of whether a borrower is experiencing financial difficulty is made on the date of a modification. Because the effect of most modifications made to borrowers experiencing financial difficulty is already included in the allowance for credit losses due to the measurement methodologies used to estimate the allowance, a change to the allowance for credit losses is generally not recorded upon modification. During the nine-months ended September 30, 2024 and 2023 , respectively, loan modifications made to borrowers experiencing financial difficulty was insignificant.

Loans Held for Sale

Loans Held for Sale	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Loans Held for Sale	Note 4 - Loans Held-for-Sale Loans held-for-sale totaled $ 20,114,000 , $ 12,229,000 and $ 14,253,000 at September 30, 2024 and 2023, and December 31, 2023, respectively. At September 30, 2024 and 2023, and December 31, 2023, $ 3,601,000 , $ 321,000 and $ 3,176,000 , respectively, are valued at the lower of cost or fair value, and the remaining amounts are valued under the fair value option. These loans, which are sold on a servicing released basis, are valued using a market approach by utilizing either: (i) the fair value of the securities backed by similar mortgage loans, adjusted for certain factors to approximate the fair value of a whole mortgage loan, including the value attributable to mortgage servicing and credit risk, (ii) current commitments to purchase loans or (iii) recent observable market trades for similar loans, adjusted for credit risk and other individual loan characteristics. As these prices are derived from market observable inputs, the Company classifies these valuations as Level 2 in the fair value disclosures (see Note 9). Interest income on mortgage loans held-for-sale is recognized based on the contractual rates and reflected in interest income on loans in the consolidated statements of earnings. The Company has no continuing ownership in any residential mortgage loans sold. The Company originates certain mortgage loans for sale in the secondary market. The mortgage loan sales contracts contain indemnification clauses should the loans default, generally in the first three to six months, or if documentation is determined not to be in compliance with regulations. The Company’s historic losses as a result of these indemnities have been insignificant.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 5 - Derivative Financial Instruments The Company enters into interest rate lock commitments (“IRLCs”) with customers to originate residential mortgage loans at a specific interest rate that are ultimately sold in the secondary market. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. The Company purchases forward mortgage-backed securities contracts to manage the changes in fair value associated with changes in interest rates related to a portion of the IRLCs. These instruments are typically entered into at the time the IRLC is made in the aggregate. The fair values of IRLCs are based on current secondary market prices for underlying loans and estimated servicing value with similar coupons, maturity and credit quality, subject to the anticipated loan funding probability (pull-through rate) net of estimated costs to originate the loan. The fair value of IRLCs is subject to change primarily due to changes in interest rates and the estimated pull-through rate. These commitments are classified as Level 3 in the fair value disclosures (see Note 9). Forward mortgage-backed securities contracts are exchange-traded or traded within highly active dealer markets. In order to determine the fair value of these instruments, the Company utilizes the exchange price or dealer market price for the particular derivative contract and these instruments are therefore classified as Level 2 in the fair value disclosures (see Note 9). The estimated fair values are subject to change primarily due to changes in interest rates. The impact of these forward contracts is included in gain on sale and fees on mortgage loans in the statement of earnings. These financial instruments are not designated as hedging instruments for accounting purposes. All derivatives are carried at fair value in either other assets or other liabilities and are reflected in the gain on sale and fees on mortgage loans in the consolidated statement of earnings. The following tables provide the outstanding notional balances and fair values of outstanding derivative positions (dollars in thousands): September 30, 2024: Outstanding Asset Liability IRLCs $ 50,053 $ 499 $ — Forward mortgage-backed securities trades 63,000 — 98 September 30, 2023: Outstanding Asset Liability IRLCs $ 35,081 $ 409 $ — Forward mortgage-backed securities trades 45,500 237 — December 31, 2023: Outstanding Asset Liability IRLCs $ 28,956 $ 427 $ — Forward mortgage-backed securities trades 35,000 — 288

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Borrowings	Note 6 – Borrowings Borrowings consisted of the following (dollars in thousands): September 30, December 31, 2024 2023 2023 Securities sold under agreements with customers to repurchase $ 57,557 $ 621,791 $ 381,928 Federal funds purchased 4,925 108,700 1,100 Other borrowings 21,053 21,053 21,053 Total $ 83,535 $ 751,544 $ 404,081 Securities sold under repurchase agreements are generally with significant customers of the Company that require short-term liquidity for their funds for which the Company pledges certain securities that have a fair value equal to at least the amount of the borrowings. The agreements mature daily and therefore the risk arising from a decline in the fair value of the collateral pledged is minimal. The securities pledged are mortgage-backed securities. These agreements do not include “right of set-off” provisions and therefore the Company does not offset such agreements for financial reporting purposes. The Company renewed its loan agreement, effective June 30, 2023 , with Frost Bank. Under the loan agreement, as renewed and amended, we are permitted to draw up to $ 25,000,000 on a revolving line of credit. There was no outstanding balance under the line of credit as of September 30, 2024. During 2021, the Company began investing in qualifying Community Development Entities ("CDE") under the federal New Market Tax Credits ("NMTC") program. See Note 7 for further discussion of our activity and related balances on the consolidated balance sheets, including the $ 21,053,000 in other borrowings shown above.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Note 7 - Income Taxes Income tax expense was $ 12,028,000 for the third quarter of 2024 as compared to $ 10,848,000 for the same period in 2023. The Company’s effective tax rates on pretax income were 17.86 % and 17.96 % for the third quarters of 2024 and 2023, respectively. Income tax expense was $ 34,664,000 for the first nine months of 2024 as compared to $ 34,291,000 for the same period in 2023. The Company’s effective tax rates on pretax income were 17.70 % and 18.31 % for the first nine months of 2024 and 2023, respectively. The effective tax rates differ from the statutory federal tax rate of 21 % primarily due to tax exempt interest income earned on certain investment securities and loans, the deductibility of dividends paid to our employee stock ownership plan, excess tax benefits for distributions under our deferred compensation plan and vesting of equity awards, and NMTC benefits. Low Income Housing Tax Credit Investments - During 2021, the Company began investing in an affordable housing fund that will invest in real estate projects that qualify for the federal low-income housing tax credit ("LIHTC") program designed to promote private development of low income housing. The investments made by the fund will generate a return to the Company primarily through the realization of LIHTCs, and also through federal tax deductions generated from the ongoing operating losses from the investees of the fund. The Company's investment in the fund will be amortized through income tax expense using the proportional amortization method as related tax credits are utilized by the Company. The initial capital contribution commitment to the fund was for up to $ 5,500,000 . Contributions were $ 2,091,000 at September 30, 2024, and $ 539,000 at September 30, 2023, and $ 615,000 at December 31, 2023, respectively, which is included in other assets on the consolidated balance sheet. New Market Tax Credit Investments - During 2021, the Company began investing in qualifying CDEs under the federal NMTC program. NMTC investments are made through the third-party CDEs which are qualified through the U.S. Department of Treasury and receive periodic allocation of amounts under the NMTC program. NMTCs are generated from qualified investments by the CDEs utilizing equity investments made by a taxpayer, like the Company. Through these equity investments, the Company will receive the tax benefits from the NMTCs equal to 39 % of the qualified investment from the CDE to qualifying eligible projects over a seven year period. The Company's equity investments in the CDEs is amortized using the proportional amortization method and related tax credits are allocated to the Company. At September 30, 2024, September 30, 2023, and December 31, 2023, the consolidated balance sheet of the Company included a $ 18,000,000 loan to the investee in loans and the $ 21,053,000 leveraged loan from the investee in other borrowings (see Note 6). At September 30, 2024 and 2023, and December 31, 2023, the consolidated balance sheet of the Company included CDE investments in other assets of $ 24,759,000 , $ 26,009,000 , and $ 25,738,000 , respectively.

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock Based Compensation	Note 8 - Stock Based Compensation On April 27, 2021, the Company’s shareholders approved the 2021 Omnibus Stock and Incentive Plan (“2021 Plan”) and reserved 2,500,000 shares of the Company’s common stock for issuance under this plan. At September 30, 2024, the Company had 1,214,226 shares of stock remaining for issuance under the plan. The 2021 Plan supersedes all prior stock option and restricted stock plans with shares previously reserved for issuance under such plans cancelled. Restricted Stock Units Under the 2021 Plan, the Company grants restricted stock units under compensation arrangements for the benefit of employees, senior and executive officers and directors. Restricted stock unit grants are subject to time-based vesting. The total number of restricted stock units granted represents the maximum number of restricted stock units eligible to vest based upon the service conditions set forth in the grant agreements. The following table summarizes information about the changes in restricted stock units for the nine-months ended September 30, 2024 and 2023. For the Nine-Months Ended September 30, 2024 2023 Restricted Weighted Restricted Weighted Balance at beginning of period 53,817 $ 37.04 39,657 $ 47.83 Grants 45,064 34.37 33,294 29.53 Vesting ( 24,075 ) 40.35 ( 14,553 ) 48.00 Forfeited/expired ( 2,389 ) 34.80 ( 2,888 ) 47.87 Balance at end of period 72,417 $ 34.35 55,510 $ 36.81 Performance Stock Units Also under the 2021 Plan, the Company awards performance-based restricted stock units (“PSUs”) to employees, senior and executive officers, and directors. Under the terms of the award, the number of units that will vest and convert to shares of common stock will be based on the extent to which the Company achieves specific performance criteria during the fixed three-year performance period. The number of shares issued upon vesting will range from 0 % to 200 % of the PSUs granted. The PSUs vest at the end of a three-year period based on either 50 % each on average adjusted earnings per share growth and return on average assets, or 100 % return on average assets, as reported, adjusted for unusual gains/losses, merger expenses, and other items as approved by the compensation committee of the Company's board of directors. Performance for each period is measured relative to other U.S. publicly traded banks with $ 10 billion to $ 50 billion in assets. Compensation expense for the PSUs will be estimated each period based on the fair value of the stock at the grant date and the most probable outcome of the performance condition, adjusted for the passage of time within the vesting period of the awards. The following table summarizes information about the changes in PSUs as of and for the nine-months ended September 30, 2024 and 2023. For the Nine-Months Ended September 30, 2024 2023 Performance-Based Restricted Weighted Performance-Based Restricted Weighted Balance at beginning of period 75,227 $ 40.24 47,082 $ 48.00 Grants 45,064 34.37 33,294 29.53 Vesting ( 20,532 ) 48.91 — — Forfeited/expired ( 2,493 ) 35.21 ( 3,456 ) 48.04 Balance at end of period 97,266 $ 35.82 76,920 $ 40.01 Restricted Stock Awards Under the 2021 Plan, the Company grants restricted stock awards under compensation arrangements for the benefit of employees, senior and executive officers and directors. Restricted stock awards are subject to time-based vesting. The total number of restricted stock awards granted represents the maximum number of shares of restricted stock eligible to vest based upon the service conditions set forth in the grant agreements. The following table summarizes information about vested and unvested restricted stock. For the Nine-Months Ended September 30, 2024 2023 Restricted Weighted Restricted Weighted Balance at beginning of period 25,190 $ 27.79 24,813 $ 36.21 Grants 24,348 30.91 25,190 27.79 Vesting ( 25,190 ) 27.79 ( 17,682 ) 38.54 Forfeited/expired — — ( 1,105 ) 29.70 Balance at end of period 24,348 $ 30.91 31,216 $ 28.25 The total fair value of restricted stock vested for the nine-months ended September 30, 2024 and 2023, was $ 2,276,000 and $ 940,000 , respectively. The Company recorded restricted stock unit, performance-based restricted stock unit and restricted stock award expense for employees of $ 521,000 and $ 483,000 for the three-months ended September 30, 2024 and 2023, respectively. The Company recorded restricted stock unit, performance-based restricted stock unit and restricted stock award expense for employees of $ 1,381,000 and $ 1,261,000 for the nine-months ended September 30, 2024 and 2023, respectively. The Company recorded director expense related to these restricted stock grants of $ 187,000 and $ 175,000 , for the three-months ended September 30, 2024 and 2023, respectively. The Company recorded director expense related to these restricted stock grants of $ 537,000 and $ 492,000 , for the nine-months ended September 30, 2024 and 2023, respectively. As of September 30, 2024 and 2023, there were $ 4,920,000 and $ 3,998,000 , respectively, of total unrecognized compensation cost related to unvested restricted stock, restricted stock units and performance-based restricted stock units which is expected to be recognized over a weighted-average period of 1.19 years and 1.27 years, respectively. At September 30, 2024 and 2023, and December 31, 2023, there was $ 112,000 , $ 107,000 and $ 124,000 , respectively, accrued in other liabilities related to dividends declared to be paid upon vesting. Stock Option Plans Prior to the approval of the 2021 Plan, the 2012 Incentive Stock Option Plan (the “2012 Plan”) provided for the granting of options to employees of the Company at prices not less than market value at the date of the grant. The 2012 Plan provided that options granted vest and are exercisable after two years from the date of grant and vest at a rate of 20 % each year thereafter and have a 10-year term. The most recent grants from the 2021 Plan provided that 20 % of the options granted vest and are exercisable after one year from the date of grant and the remaining options vest and are exercisable at a rate of 20 % each year thereafter, or 33.3 % of the options granted are vested and exercisable after one year from the date of the grant and the remaining options are vested and exercisable at a rate of 33.3 % each year thereafter, and have a 10-year term. Shares are issued under the 2012 Plan and the 2021 Plan from available authorized shares. An analysis of stock option activity for the nine-months ended September 30, 2024 is presented in the table and narrative below:​​​​​​​ Shares Weighted- Outstanding, December 31, 2023 1,552,249 $ 30.45 Granted 270,495 34.37 Exercised ( 124,887 ) 20.38 Cancelled ( 66,589 ) 34.43 Outstanding, September 30, 2024 1,631,268 31.70 Exercisable, September 30, 2024 960,544 $ 28.30 The options outstanding at September 30, 2024 had exercise prices ranging between $ 16.95 and $ 48.91 . Stock options have been adjusted retroactively for the effects of stock dividends and splits. The Company grants incentive stock options for a fixed number of shares with an exercise price equal to the fair value of the shares at the date of grant to employees. The Company recorded stock option expense totaling $ 546,000 and $ 391,000 for the three-months ended September 30, 2024 and 2023, respectively. The Company recorded stock option expense totaling $ 1,516,000 and $ 1,280,000 for the nine-months ended September 30, 2024 and 2023, respectively. As of September 30, 2024, there was $ 5,888,000 of total unrecognized compensation cost related to unvested share-based compensation arrangements granted under the plans. That cost is expected to be recognized over a weighted-average period of 1.36 years. The total fair value of shares vested during the nine-months ended September 30, 2024 and 2023 was $ 2,131,000 and $ 2,110,000 , respectively.

Fair Value Disclosures

Fair Value Disclosures	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Note 9 - Fair Value Disclosures The authoritative accounting guidance for fair value measurements defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that 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 shall not be 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. The authoritative accounting guidance requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert future amounts, such as cash flows or earnings, to a single present amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement costs). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or 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. In that regard, the authoritative guidance establishes a fair value hierarchy for valuation inputs that 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 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 (for example, interest rates, volatilities, prepayment speeds, loss severities, credit risks and default rates) or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3 Inputs – Significant unobservable inputs that reflect an entity’s own assumptions that market participants would use in pricing the assets or liabilities. 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. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Securities classified as available-for-sale and trading are reported at fair value utilizing Level 1 and Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include market spreads, cash flows, the United States Treasury yield curve, live trading levels, trade execution data, dealer quotes, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other items. See Notes 4 and 5 related to the determination of fair value for loans held-for-sale, IRLCs and forward mortgage-backed securities trades. There were no transfers between Level 2 and Level 3 during the three and nine-months ended September 30, 2024 and 2023, and the year ended December 31, 2023. The following table summarizes the Company’s available-for-sale securities, loans held-for-sale, and derivatives which are measured at fair value on a recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands): September 30, 2024 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 293,014 $ — $ — $ 293,014 Obligations of state and political subdivisions — 1,471,483 — 1,471,483 Corporate bonds — 102,471 — 102,471 Residential mortgage-backed securities — 2,423,930 — 2,423,930 Commercial mortgage-backed securities — 316,836 — 316,836 Other securities 4,565 — — 4,565 Total $ 297,579 $ 4,314,720 $ — $ 4,612,299 Loans held-for-sale $ — $ 16,513 $ — $ 16,513 IRLCs $ — $ — $ 499 $ 499 Forward mortgage-backed securities trades $ — $ ( 98 ) $ — $ ( 98 ) September 30, 2023 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 485,447 $ — $ — $ 485,447 Obligations of states and political subdivisions — 1,463,754 — 1,463,754 Corporate bonds — 96,961 — 96,961 Residential mortgage-backed securities — 2,297,235 — 2,297,235 Commercial mortgage-backed securities — 305,348 — 305,348 Other securities 3,792 — — 3,792 Total $ 489,239 $ 4,163,298 $ — $ 4,652,537 Loans held-for-sale $ — $ 11,908 $ — $ 11,908 IRLCs $ — $ — $ 409 $ 409 Forward mortgage-backed securities trades $ — $ 237 $ — $ 237 December 31, 2023 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 482,234 $ — $ — $ 482,234 Obligations of state and political subdivisions — 1,497,157 — 1,497,157 Corporate bonds — 100,471 — 100,471 Residential mortgage-backed securities — 2,364,092 — 2,364,092 Commercial mortgage-backed securities — 284,324 — 284,324 Other securities 4,484 — — 4,484 Total $ 486,718 $ 4,246,044 $ — $ 4,732,762 Loans held-for-sale $ — $ 11,077 $ — $ 11,077 IRLCs $ — $ — $ 427 $ 427 Forward mortgage-backed securities trades $ — $ ( 288 ) $ — $ ( 288 ) The following table summarizes the Company’s loans held-for-sale at fair value and the net unrealized gains as of the balance sheet dates shown below (dollars in thousands): September 30, December 31, 2024 2023 2023 Unpaid principal balance on loans held-for-sale $ 16,086 $ 11,684 $ 10,757 Net unrealized gains on loans held-for-sale 427 224 320 Loans held-for-sale at fair value $ 16,513 $ 11,908 $ 11,077 The following table summarizes the Company’s gains on sale and fees of mortgage loans for the three and nine-months ended September 30, 2024 and 2023 (dollars in thousand): Three-Months Ended Nine-Months Ended 2024 2023 2024 2023 Realized gain on sale and fees on mortgage loans* $ 3,463 $ 3,485 $ 9,813 $ 9,774 Change in fair value on loans held-for-sale and IRLCs ( 10 ) ( 121 ) 171 24 Change in forward mortgage-backed securities trades ( 94 ) 78 190 152 Total gain on sale of mortgage loans $ 3,359 $ 3,442 $ 10,174 $ 9,950 * This includes gains on loans held-for-sale carried under the fair value method and lower of cost or market. No residential mortgage loans held-for-sale were 90 days or more past due or considered nonaccrual as of September 30, 2024, September 30, 2023, or December 31, 2023 . No significant credit losses were recognized on mortgage loans held-for-sale for the three and nine-months ended September 30, 2024 and 2023. Certain non-financial assets and non-financial liabilities measured at fair value on a nonrecurring basis include other real estate owned, goodwill and other intangible assets, and other non-financial long-lived assets. Non-financial assets measured at fair value on a non-recurring basis during the nine-months ended September 30, 2024 include other real estate owned which, subsequent to their initial transfer to other real estate owned from loans, were re-measured at fair value through a write-down included in gain (loss) on sale of foreclosed assets. During the reported periods, all fair value measurements for foreclosed assets utilized Level 2 inputs based on observable market data, generally third-party appraisals, or Level 3 inputs based on customized discounting criteria. These appraisals are evaluated individually and discounted as necessary due to the age of the appraisal, lack of comparable sales, expected holding periods of property or specia l use type of the property. Such discounts vary by appraisal based on the above factors but generally range from 5 % to 25 % of the appraised value. Re-evaluation of other real estate owned is performed at least annually as required by regulatory guidelines or more often if particular circumstances arise. There were no significant other real estate owned properties that were re-measured subsequent to their initial transfer to other real estate owned during the three and nine-months ended September 30, 2024 and 2023. At September 30, 2024 and 2023, and December 31, 2023, other real estate owned totaled $ 501,000 , $ 15,000 , and $ 483,000 , respectively. The Company is required under current authoritative accounting guidance to disclose the estimated fair value of their financial instrument assets and liabilities including those subject to the requirements discussed above. For the Company, as for most financial institutions, substantially all of its assets and liabilities are considered financial instruments. Many of the Company’s financial instruments, however, lack an available trading market as characterized by a willing buyer and willing seller engaging in an exchange transaction. The estimated fair value amounts of financial instruments have been determined by the Company using available market information and appropriate valuation methodologies. However, considerable judgment is required to interpret data to develop the estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize in a current market exchange. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. In addition, reasonable comparability between financial institutions may not be likely due to the wide range of permitted valuation techniques and numerous estimates that must be made given the absence of active secondary markets for many of the financial instruments. This lack of uniform valuation methodologies also introduces a greater degree of subjectivity to these estimated fair values. Cash and due from banks, federal funds sold, interest-bearing deposits in banks and accrued interest receivable and payable are liquid in nature and considered Levels 1 or 2 of the fair value hierarchy. Financial instruments with stated maturities have been valued using a present value discounted cash flow with a discount rate approximating current market for similar assets and liabilities and are considered Levels 2 and 3 of the fair value hierarchy. Financial instrument liabilities with no stated maturities have an estimated fair value equal to both the amount payable on demand and the carrying value and are considered Level 1 of the fair value hierarchy. The carrying value and the estimated fair value of the Company’s contractual off-balance-sheet unfunded lines of credit, loan commitments and letters of credit, which are generally priced at market at the time of funding, are not material. The estimated fair values and carrying values of all financial instruments under current authoritative guidance were as follows (dollars in thousands). September 30, December 31, 2024 2023 2023 Carrying Value Estimated Carrying Estimated Carrying Estimated Fair Value Cash and due from banks $ 296,188 $ 296,188 $ 208,277 $ 208,277 $ 281,354 $ 281,354 Level 1 Interest-bearing demand deposits 287,476 287,476 180,008 180,008 255,237 255,237 Level 1 Available-for-sale securities 4,612,299 4,612,299 4,652,537 4,652,537 4,732,762 4,732,762 Levels 1 Loans held-for-investment, net of 7,623,255 7,607,920 6,904,982 6,890,218 7,060,057 7,036,722 Level 3 Loans held-for-sale 20,114 20,293 12,229 12,266 14,253 14,378 Level 2 Accrued interest receivable 56,427 56,427 53,518 53,518 58,544 58,544 Level 2 Deposits with stated maturities 1,009,667 1,011,199 1,004,227 1,002,893 938,980 938,534 Level 2 Deposits with no stated maturities 10,746,194 10,746,194 9,712,296 9,712,296 10,199,320 10,199,320 Level 1 Repurchase Agreements 57,557 57,557 621,791 621,791 381,928 381,928 Level 2 Borrowings 25,978 25,978 129,753 129,753 22,153 22,153 Level 2 Accrued interest payable 9,502 9,502 13,557 13,557 10,215 10,215 Level 2 IRLCs 499 499 409 409 427 427 Level 3 Forward mortgage-backed securities ( 98 ) ( 98 ) 237 237 ( 288 ) ( 288 ) Level 2

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations First Financial Bankshares, Inc., a Texas corporation (“Bankshares,” “Company,” “we” or “us”), is a financial holding company which owns all of the capital stock of First Financial Bank which had 79 locations located in Texas as of September 30, 2024 . The Company’s primary source of revenue is providing loans and banking services to consumers and commercial customers in the market area in which First Financial Bank is located. In addition, the Company also owns First Financial Trust & Asset Management Company, First Financial Insurance Agency, Inc. (inactive), First Technology Services, Inc., FFB Investment Paris Fund, LLC, and FFB Portfolio Management, Inc.
Basis of Presentation	Basis of Presentation A summary of significant accounting policies of the Company and its subsidiaries applied in the preparation of the accompanying consolidated financial statements follows. The accounting principles followed by the Company and the methods of applying them are in conformity with both United States generally accepted accounting principles (“GAAP”) and prevailing practices of the banking industry. The Company evaluated subsequent events for potential recognition through the date the consolidated financial statements were issued.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The Company’s significant estimates include its allowance for credit losses and its valuation of financial instruments.
Consolidation	Consolidation The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries, all of which are wholly-owned. All significant intercompany accounts and transactions have been eliminated.
Stock Repurchase	Stock Repurchase On July 23, 2024, the Company’s Board of Directors extended the authorization to repurchase up to 5,000,000 common shares through July 31, 2025. The prior authorization had been in place since July 27, 2021. The stock repurchase plan authorizes management to repurchase and retire the stock at such time as repurchases and retirements are considered beneficial to the Company and stockholders. Any repurchase of stock will be made through the open market, block trades, or in privately negotiated transactions in accordance with applicable laws and regulations. Under the repurchase plan, there is no minimum number of shares that the Company is required to repurchase. Under the previous authorization effective through July 31, 2024, the Company repurchased and retired 101,337 shares (all during September 2023) at an average price of $ 26.99 per share.
Other Recently Issued and Effective Authoritative Accounting Guidance	Other Recently Issued and Effective Authoritative Accounting Guidance ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” ASU 2020-04 provides optional expedients and exceptions for accounting related to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. ASU 2020-04 applies only to contracts, hedging relationships, and other transactions that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform and do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. ASU 2020-04 was effective upon issuance, and based upon the amendments provided in ASU 2022-06 discussed below, can generally be applied through December 31, 2024. The adoption of ASU 2020-04 did not have a significant impact on our financial statements. ASU 2021-01, “Reference Rate Reform (Topic 848): Scope.” ASU 2021-01 clarifies that certain optional expedients and exceptions in ASC 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. ASU 2021-01 also amends the expedients and exceptions in ASC 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition. ASU 2021-01 was effective upon issuance, and based upon the amendments provided in ASU 2022-06 discussed below, can generally be applied through December 31, 2024. The adoption of ASU 2021-01 did not have a significant impact on our financial statements. ASU 2022-02, "Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures." ASU 2022-02 eliminates the accounting guidance for troubled debt restructurings in ASC Subtopic 310-40, Receivables - Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. ASU 2022-02 will also require that an entity disclose current-period gross charge-offs by year of origination for financial receivables and net investment leases within the scope of ASC Subtopic 326-20, Financial Instruments - Credit Losses - Measured at Amortized Cost. ASU 2022-02 became effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, though early adoption is permitted. The adoption of ASU 2022-02 did not have a significant impact on our financial statements. ASU 2022-06, "Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848." ASU 2022-06 extends the period of time preparers can utilize the reference rate reform relief guidance provided by ASU 2020-04 and ASU 2021-01, which are discussed above. ASU 2022-06, which was effective upon issuance, defers the sunset date of this prior guidance from December 31, 2022 to December 31, 2024, after which entities will no longer be permitted to apply the relief guidance in Topic 848. The adoption of ASU 2022-06 did not have a significant impact on our financial statements. ASU 2023-02, "Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method." ASU 2023-02 is intended to improve the accounting and disclosures for investments in tax credit structures. ASU 2023-02 allows entities to elect to account for qualifying tax equity investments using the proportional amortization method, regardless of the program giving rise to the related income tax credits. Previously, this method was only available for qualifying tax equity investments in low-income housing tax credit structures. ASU 2023-02 has been early adopted by the Company as it relates to the qualifying investments that are generating New Market Tax Credits. The adoption of ASU 2023-02 did not have a significant impact on our financial statements. ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” ASU 2023-09 requires entities to disclose more detailed information in their reconciliation of their statutory tax rate to their effective tax rate. Public business entities (PBEs) are required to provide this incremental detail in a numerical, tabular format. The ASU also requires entities to disclose more detailed information about income taxes paid, including by jurisdiction; pretax income (or loss) from continuing operations; and income tax expense (or benefit). PBEs will be required to adopt the new requirements in annual reporting periods beginning after December 15, 2024, and interim periods beginning after December 15, 2025. The adoption of ASU 2023-09 is not expected to have a significant impact on our financial statements.
Investment Securities	Investment Securities Management classifies debt securities as held-to-maturity, available-for-sale, or trading based on its intent. Securities that management has the positive intent and ability to hold to maturity are classified as held-to-maturity and recorded at amortized cost, adjusted for amortization of premiums and accretion of discounts, which are recognized as adjustments to interest income using the interest method. Securities not classified as held-to-maturity or trading are classified as available-for-sale and recorded at fair value, with unrealized holding gains and losses (those for which no allowance for credit losses are recorded) reported as a component of other comprehensive income, net of tax. Management determines the appropriate classification of securities at the time of purchase. Interest income includes amortization of purchase premiums and discounts over the period to maturity using a level-yield method, except for premiums on callable securities, which are amortized to their earliest call date. Realized gains and losses are recorded on the sale of securities in noninterest income. The Company has made a policy election to exclude accrued interest from the amortized cost basis of securities and report accrued interest separately in other assets on the consolidated balance sheets. A security is placed on nonaccrual status at the time any principal or interest payments become more than 90 days delinquent or if full collection of interest or principal becomes uncertain. Accrued interest for a security placed on nonaccrual is reversed against interest income. There was no accrued interest related to securities reversed against interest income for the three and nine-months ended September 30, 2024 or 2023, respectively. The Company records its available-for-sale securities portfolio at fair value. Fair values of these securities are determined based on methodologies in accordance with current authoritative accounting guidance. Fair values are volatile and may be influenced by a number of factors, including market interest rates, prepayment speeds, discount rates, credit ratings, and yield curves. Fair values for securities are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on the quoted prices of similar instruments or an estimate of fair value by using a range of fair value estimates in the marketplace as a result of the illiquid market, specific to the type of security. The Company’s investment portfolio currently consists of obligations of state and political subdivisions, mortgage pass-through securities, corporate bonds and general obligation or revenue based municipal bonds. Pricing for such securities is generally readily available and transparent in the market. The Company utilizes independent third-party pricing services to value its investment securities, which the Company reviews as well as the underlying pricing methodologies for reasonableness and to ensure such prices are aligned with pricing matrices. The Company validates prices supplied by the independent pricing services by comparison to prices obtained from other third-party sources on a quarterly basis.
Allowance for Credit Losses – Available-for-Sale Securities	Allowance for Credit Losses – Available-for-Sale Securities For available-for-sale securities in an unrealized loss position, we first assess whether we intend to sell, or if it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, any previously recognized allowances are charged-off and the security’s amortized cost basis is written down to fair value through income as a provision for credit losses. For available-for-sale securities that do not meet the aforementioned criteria, we evaluate whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Management has made the accounting policy election to exclude accrued interest receivable on available-for-sale securities from the estimate of credit losses. Changes in the allowance for credit losses are recorded as provision for (or reversal of) credit losses. Available-for-sale securities are charged-off against the allowance or, in the absence of any allowance, written down through income when deemed uncollectible by management or when either of the aforementioned criteria regarding intent or requirement to sell is met. At September 30, 2024 and 2023, and December 31, 2023 , no allowance for credit losses - available-for-sale securities was recorded.
Allowance for Credit Losses – Held-to-Maturity Securities	Allowance for Credit Losses – Held-to-Maturity Securities The allowance for credit losses on held-to-maturity securities is a contra-asset valuation account, calculated in accordance with ASC 326, that is deducted from the amortized cost basis of held-to-maturity securities to present management’s best estimate of the net amount expected to be collected. Held-to-maturity securities are charged-off against the allowance when deemed uncollectible by management. Adjustments to the allowance are reported in our income statement as a component of credit loss expense. Management measures expected credit losses on held-to-maturity securities on a collective basis by major security type with each type sharing similar risk characteristics and considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. Management has made the accounting policy election to exclude accrued interest receivable on held-to-maturity securities from the estimate of credit losses. At September 30, 2024 and 2023, and December 31, 2023 , the Company held no securities that were classified as held-to-maturity.
Loans Held-for-Investment	Loans Held-for-Investment Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at amortized cost, net of the allowance for credit losses. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts, fair value hedge accounting adjustments, deferred loan fees and costs. The Company has made a policy election to exclude accrued interest from the amortized cost basis of loans and report accrued interest separately from the related loan balance in other assets on the condensed consolidated balance sheets. Interest on loans is calculated by using the simple interest method on daily balances of the principal amounts outstanding. The Company defers and amortizes net loan origination fees and costs as an adjustment to yield. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are placed on nonaccrual status when, in management’s opinion, the borrower may be unable to meet payment obligations as they become due, as well as when required by regulatory provisions. In determining whether or not a borrower may be unable to meet payment obligations for each class of loans, we consider the borrower’s debt service capacity through the analysis of current financial information, if available, and/or current information with regards to our collateral position. Regulatory provisions would typically require the placement of a loan on nonaccrual status if principal or interest has been in default for a period of 90 days or more unless the loan is both well secured and in the process of collection or full payment of principal and interest is not expected. Loans may be placed on nonaccrual status regardless of whether or not such loans are considered past due. When interest accrual is discontinued, all unpaid accrued interest is reversed. Interest income on nonaccrual loans is recognized only to the extent that cash payments are received in excess of principal due. A loan may be returned to accrual status when all the principal and interest amounts contractually due are brought current and future principal and interest amounts contractually due are reasonably assured. Further information regarding our accounting policies related to past due loans, nonaccrual loans and loans to borrowers experiencing financial difficulty is presented in Note 3.
Acquired Loans	Acquired Loans Loans acquired in connection with acquisitions are recorded at their acquisition-date fair value. The allowance for credit losses related to the acquired loan portfolio is not carried over. Acquired loans are classified into two categories based on the credit risk characteristics of the underlying borrowers as either purchased credit deteriorated (“PCD”) loans, or loans with no evidence of credit deterioration (“non-PCD”). PCD loans are defined as a loan or pool of loans that have experienced more-than-insignificant credit deterioration since the origination date. The Company uses a combination of individual and pooled review approaches to determine if acquired loans are PCD. At acquisition, the Company considers a number of factors to determine if an acquired loan or pool of loans has experienced more-than-insignificant credit deterioration. The initial allowance related to PCD loans that share similar risk characteristics is established using a pooled approach. The Company uses either a discounted cash flow or weighted average remaining life method to determine the required level of the allowance. PCD loans that were classified as nonaccrual as of the acquisition date and are collateral dependent are assessed for allowance on an individual basis. For PCD loans, an initial allowance is established on the acquisition date. Subsequent to the acquisition date, the initial allowance for credit losses on PCD loans will increase or decrease based on future evaluations, with changes recognized in the provision for credit losses. Non-PCD loans are pooled into segments together with originated loans that share similar risk characteristics and have an allowance established on the acquisition date, which is recognized in the current period provision for credit losses as well as a fair value adjustment to the amortized cost of the loan and accreted into income over the life of the loan. Determining the fair value of the acquired loans involves estimating the principal and interest payment cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. Management considers a number of factors in evaluating the acquisition-date fair value including the remaining life, interest rate profile, market interest rate environment, payment schedules, risk ratings, probability of default and loss given default, and estimated prepayment rates. For PCD loans, the non-credit discount or premium is allocated to individual loans as determined by the difference between the loan’s unpaid principal balance and amortized cost basis. For non-PCD loans, the fair value discount or premium is allocated to individual loans and recognized into interest income on a level yield basis over the remaining expected life of the loan.
Allowance for Credit Losses - Loans	Allowance for Credit Losses - Loans The allowance for credit losses (“allowance” or “ACL”) is a contra-asset valuation account, calculated in accordance with ASC 326, that is deducted from the amortized cost basis of loans. The ACL represents an amount which, in management’s judgment, is adequate to absorb the lifetime expected credit losses that may be experienced on outstanding loans at the balance sheet date based on the evaluation of the size and current risk characteristics of the loan portfolio, past events, current conditions, reasonable and supportable forecasts of future economic conditions and prepayment experience. The allowance for credit losses is measured and recorded upon the initial recognition of a financial asset. Determination of the adequacy of the allowance is inherently complex and requires the use of significant and highly subjective estimates. Loans are charged-off against the allowance when deemed uncollectible by management. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. Adjustments to the allowance are reported in our income statement as a component of the provision for credit losses. Management has made the accounting policy election to exclude accrued interest receivable on loans from the estimate of credit losses. The Company’s methodology for estimating the allowance includes: (1) a collective quantified reserve that reflects the Company’s historical default and loss experience adjusted for expected economic conditions throughout a reasonable and supportable period and the Company’s prepayment and curtailment rates; (2) collective qualitative factors based on the risk perceived in concentrations of the loan portfolio, changes in economic conditions, early delinquencies, and factors related to credit administrations, including, among others, underwriting standards, loan-to-value ratios, and borrowers’ risk rating; and (3) individual allowances on loans where borrowers are experiencing financial difficulty or when the Company determines that the foreclosure is probable. In calculating the allowance for credit losses, most loans are segmented into pools based upon similar characteristics and risk profiles. Common characteristics and risk profiles include the type/purpose of loan, underlying collateral, geographical similarity and historical/expected credit loss patterns. In developing these loan pools for the purposes of modeling expected credit losses, we also analyzed the degree of correlation in how loans within each portfolio respond when subjected to varying economic conditions and scenarios as well as other portfolio stress factors. For modeling purposes, our loan portfolio segments include C&I, Municipal, Agricultural, Construction and Development, Farm, Non-Owner Occupied and Owner Occupied CRE, Residential, Consumer Auto and Consumer Non-Auto. We periodically reassess each pool to ensure the loans within the pool continue to share similar characteristics and risk profiles and to determine whether further segmentation is necessary. Refer to Note 3 for more details on the Company’s portfolio segments. The Company applies two methodologies to estimate the allowance on its pooled portfolio segments; discounted cash flows method and weighted average remaining life method. Allowance estimates on the following portfolio segments are calculated using the discounted cash flows method: C&I, Municipal, Construction and Development, Farm, Non-Owner Occupied and Owner Occupied CRE and Residential. Allowance estimates on the following portfolio segments are calculated using the remaining life method: Agriculture, Consumer Auto and Consumer Non-Auto. The models related to these methodologies utilize the Company’s historical default and loss experience adjusted for future economic forecasts. The reasonable and supportable forecast period represents a one-year economic outlook for the applicable economic variables. Following the end of the reasonable and supportable forecast period, expected losses revert back to the historical mean over the next two years on a straight-line basis. Economic variables that have the most significant impact on the allowance include: Texas unemployment rate, Texas house price index and Texas retail sales index. Contractual loan level cash flows within the discounted cash flows methodology are adjusted for the Company’s historical prepayment and curtailment rate experience. In some cases, management may determine that an individual loan exhibits unique risk characteristics which differentiate the loan from other loans within our loan pools. In such cases, the loans are evaluated for expected credit losses on an individual basis and excluded from the collective evaluation. Specific allocations of the allowance for credit losses are determined by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies, the relative risk rating of the loan and economic conditions affecting the borrower’s industry, among other things. A loan is considered to be collateral dependent when, based upon management’s assessment, the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale of the collateral. In such cases, expected credit losses are based on the fair value of the collateral at the measurement date, adjusted for estimated selling costs if satisfaction of the loan depends on the sale of the collateral. We reevaluate the fair value of collateral supporting collateral dependent loans on an ongoing basis. Management qualitatively adjusts model results for risk factors that are not considered within our modeling processes but are nonetheless relevant in assessing the expected credit losses within our loan pools. These qualitative factor (“Q-Factor”) adjustments may increase management’s estimate of expected credit losses based upon the estimated level of risk within the risk factor. The various risk factors that may be considered in making Q-Factor adjustments include, among other things, the impact of (i) changes in lending policies and procedures, including changes in underwriting standards and practices for collections, write-offs, and recoveries, (ii) actual and expected changes in national, regional, and local economic and business conditions and developments that affect the collectability of the loan pools, (iii) changes in the nature, volume and size of a loan or the loan pools and in the terms of the underlying loans, (iv) changes in the experience, ability, and depth of our lending management and staff, (v) changes in volume and severity of past due financial assets, the volume of nonaccrual assets, and the volume and severity of adversely classified or graded assets, (vi) changes in the quality of our credit review function, (vii) changes in the value of the underlying collateral for loans that are non-collateral dependent, (viii) the existence, growth, and effect of any concentrations of credit, and (ix) other factors such as the regulatory, legal and technological environments, competition, and events such as natural disasters or health pandemics. Management believes it uses relevant information available to make determinations about the allowance and that it has established the existing allowance in accordance with GAAP. However, the determination of the allowance requires significant judgment, and estimates of expected lifetime losses in the loan portfolio can vary significantly from the amounts actually observed. While management uses available information to recognize expected losses, future additions to the allowance may be necessary based on changes in the loans comprising the portfolio, changes in the current and forecasted economic conditions, changes to the interest rate environment which may directly impact prepayment and curtailment rate assumptions, and changes in the financial condition of borrowers.
Allowance for Credit Losses - Off-Balance-Sheet/Reserve for Unfunded Commitments	Allowance for Credit Losses - Off-Balance-Sheet/Reserve for Unfunded Commitments The allowance for credit losses on off-balance-sheet credit exposures is a liability account, calculated in accordance with ASC 326, representing expected credit losses over the contractual period for which we are exposed to credit risk resulting from a contractual obligation to extend credit. These obligations include unfunded lines of credit, commitments to extend credit and federal funds sold to correspondent banks and standby letters of credit. No allowance is recognized if we have the unconditional right to cancel the obligation. The allowance is reported as a component of accrued interest payable and other liabilities in our consolidated balance sheets. Adjustments to the allowance are reported in our income statement as a component of the provision for credit losses. At September 30, 2024, the Company’s reserve for unfunded commitments totaled $ 8,004,000 . The reserve for unfunded commitments totaled $ 7,903,000 at both September 30, 2023 and December 31, 2023 , respectively. The reserve for unfunded commitments is included in other liabilities in the consolidated balance sheet.
Other Real Estate	Other Real Estate Other real estate owned is foreclosed property held pending disposition and is initially recorded at fair value, less estimated costs to sell, and is included in other assets in the consolidated balance sheet. At foreclosure, if the fair value of the real estate, less estimated costs to sell, is less than the Company’s recorded investment in the related loan, a write-down is recognized through a charge to the ACL. Any subsequent reduction in value is recognized by a charge to income. Operating and holding expenses of such properties, net of related income, and gains/losses on their disposition are included in net gain (loss) on sale of foreclosed assets as incurred.
Bank Premises and Equipment	Bank Premises and Equipment Bank premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed principally on a straight-line basis over the estimated useful lives of the related assets. Leasehold improvements are amortized over the life of the respective lease or the estimated useful lives of the improvements, whichever is shorter.
Business Combinations, Goodwill and Other Intangible Assets	Business Combinations, Goodwill and Other Intangible Assets The Company accounts for all business combinations under the purchase method of accounting. Tangible and intangible assets and liabilities of the acquired entity are recorded at fair value. Intangible assets with finite useful lives represent the future benefit associated with the acquisition of the core deposits and are amortized over seven years , utilizing a method that approximates the expected attrition of the deposits. Goodwill with an indefinite life is not amortized, but rather tested annually for impairment as of June 30 each year. There was no impairment recorded during the nine-months ended September 30, 2024 or 2023 , respectively.
Securities Sold Under Agreements To Repurchase	Securities Sold Under Agreements to Repurchase Securities sold under agreements to repurchase, which are classified as borrowings, generally mature within one to four days from the transaction date. Securities sold under agreements to repurchase are reflected at the amount of the cash received in connection with the transaction. The Company may be required to provide additional collateral based on the estimated fair value of the underlying securities.
Segment Reporting	Segment Reporting The Company has determined that its banking regions meet the aggregation criteria of the current authoritative accounting guidance since each of its banking regions offer similar products and services, operate in a similar manner, have similar customers and report to the same regulatory authority, and therefore operate one line of business (community banking) located in a single geographic area (Texas).
Statements of Cash Flows	Statements of Cash Flows For purposes of reporting cash flows, cash and cash equivalents includes cash on hand, amounts due from banks, including interest-bearing deposits in banks with original maturity of 90 days or less , and federal funds sold.
Accumulated Other Comprehensive Earnings (Loss)	Accumulated Other Comprehensive Earnings (Loss) Unrealized net losses on the Company’s available-for-sale securities, net of applicable income taxes, totaled $ 329,817,000 , $ 639,934,000 and $ 403,298,000 at September 30, 2024, and 2023, and December 31, 2023 , respectively, are included in accumulated other comprehensive earnings (loss) as a separate component of shareholders' equity.
Income Taxes	Income Taxes The Company’s provision for income taxes is based on income before income taxes adjusted for permanent differences between financial reporting and taxable income. Deferred tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the temporary differences between the book and tax bases of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. As of September 30, 2024, and 2023, and December 31, 2023, deferred tax assets totaled $ 94,239,000 , $ 173,032,000 and $ 110,800,000 , respectively, and were included in other assets on the consolidated balance sheets.
Stock Based Compensation	Stock Based Compensation The Company grants stock options for a fixed number of shares to employees with an exercise price equal to the fair value using the Black-Scholes model of the shares at the grant date. The grant date fair value is amortized over the vesting period, which generally is three, five or six years. The Company also grants restricted stock and/or units for a fixed number of shares which generally vests over periods of one to three years, and performance stock units which vest over a three-year period based on Company performance metrics relative to a defined peer group. For stock option grants, the exercise price is established based on the closing trading price. No adjustments have been necessary to properly value the grant based on the terms or other conditions of the grants. Expense is recognized based on the fair value of the portion of stock-based payment awards that ultimately expected to vest, reduced for forfeitures based on grant-date fair value. See Note 8 for further information.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred.
Per Share Data	Per Share Data Net earnings per share (“EPS”) are computed by dividing net earnings by the weighted average number of common shares outstanding during the period. The Company calculates dilutive EPS assuming all outstanding stock options to purchase common shares and unvested restricted stock shares and units have been exercised and/or vested at the beginning of the year (or the time of issuance, if later.) The dilutive effect of the outstanding options and restricted stock is determined by application of the treasury stock method, whereby the proceeds from the exercised options and unearned compensation for both restricted stock and stock options are assumed to be used to purchase common shares at the average market price during the respective period. There were 375,000 and 449,000 anti-dilutive shares for the three and nine-months ended September 30, 2024 that were excluded from the computation of EPS. There were 864,000 and 478,000 anti-dilutive shares for the three and nine-months ended September 30, 2023 that were excluded from the computation of EPS. The following table reconciles the computation of basic EPS to diluted EPS: Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended September 30, 2024: Net earnings per share, basic $ 55,308 142,853,215 $ 0.39 Effect of stock options and stock grants — 335,642 — Net earnings per share, diluted $ 55,308 143,188,857 $ 0.39 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended September 30, 2023: Net earnings per share, basic $ 49,556 142,707,260 $ 0.35 Effect of stock options and stock grants — 442,113 — Net earnings per share, diluted $ 49,556 143,149,373 $ 0.35 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the nine-months ended September 30, 2024: Net earnings per share, basic $ 161,190 142,797,621 $ 1.13 Effect of stock options and stock grants — 362,031 — Net earnings per share, diluted $ 161,190 143,159,652 $ 1.13 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the nine-months ended September 30, 2023: Net earnings per share, basic $ 152,997 142,691,389 $ 1.07 Effect of stock options and stock grants — 351,469 — Net earnings per share, diluted $ 152,997 143,042,858 $ 1.07

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Computation of Basic EPS to Dilutive EPS	The following table reconciles the computation of basic EPS to diluted EPS: Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended September 30, 2024: Net earnings per share, basic $ 55,308 142,853,215 $ 0.39 Effect of stock options and stock grants — 335,642 — Net earnings per share, diluted $ 55,308 143,188,857 $ 0.39 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended September 30, 2023: Net earnings per share, basic $ 49,556 142,707,260 $ 0.35 Effect of stock options and stock grants — 442,113 — Net earnings per share, diluted $ 49,556 143,149,373 $ 0.35 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the nine-months ended September 30, 2024: Net earnings per share, basic $ 161,190 142,797,621 $ 1.13 Effect of stock options and stock grants — 362,031 — Net earnings per share, diluted $ 161,190 143,159,652 $ 1.13 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the nine-months ended September 30, 2023: Net earnings per share, basic $ 152,997 142,691,389 $ 1.07 Effect of stock options and stock grants — 351,469 — Net earnings per share, diluted $ 152,997 143,042,858 $ 1.07

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2024
Cash and Cash Equivalents [Abstract]
Summary of Available-for-Sale Securities	The amortized cost, related gross unrealized gains and losses, allowance for credit losses and the fair value of available-for-sale securities are as follows (dollars in thousands): September 30, 2024 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 298,671 $ 14 $ ( 5,671 ) $ 293,014 Obligations of states and political subdivisions 1,586,300 699 ( 115,516 ) 1,471,483 Residential mortgage-backed securities 2,712,305 1,655 ( 290,030 ) 2,423,930 Commercial mortgage-backed securities 320,685 1,946 ( 5,795 ) 316,836 Corporate bonds and other 112,163 59 ( 5,186 ) 107,036 Total securities available-for-sale $ 5,030,124 $ 4,373 $ ( 422,198 ) $ 4,612,299 September 30, 2023 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 507,549 $ — $ ( 22,102 ) $ 485,447 Obligations of states and political subdivisions 1,726,947 120 ( 263,313 ) 1,463,754 Residential mortgage-backed securities 2,792,813 — ( 495,578 ) 2,297,235 Commercial mortgage-backed securities 323,539 — ( 18,191 ) 305,348 Corporate bonds and other 112,338 — ( 11,585 ) 100,753 Total securities available-for-sale $ 5,463,186 $ 120 $ ( 810,769 ) $ 4,652,537 December 31, 2023 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 496,975 $ 4 $ ( 14,745 ) $ 482,234 Obligations of states and political subdivisions 1,621,405 934 ( 125,182 ) 1,497,157 Residential mortgage-backed securities 2,716,968 7 ( 352,883 ) 2,364,092 Commercial mortgage-backed securities 295,663 — ( 11,339 ) 284,324 Corporate bonds and other 112,670 — ( 7,715 ) 104,955 Total securities available-for-sale $ 5,243,681 $ 945 $ ( 511,864 ) $ 4,732,762
Carrying Value and Estimated Fair Value of Available-for-Sale Securities	The carrying value and estimated fair value of available-for-sale securities at September 30, 2024, by contractual and expected maturity, are shown below (dollars in thousands): Carrying Estimated Value Fair Value Due within one year $ 281,764 $ 278,517 Due after one year through five years 1,758,382 1,662,649 Due after five years through ten years 2,167,043 1,955,247 Due after ten years 822,935 715,886 Total $ 5,030,124 $ 4,612,299
Continuous Unrealized-Loss Position of Available-for-Sale Securities	The following tables disclose as of September 30, 2024 and 2023, and December 31, 2023 , the Company’s investment securities that have been in a continuous unrealized-loss position for less than 12 months and for 12 or more months (dollars in thousands): Less than 12 Months 12 Months or Longer Total September 30, 2024 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ — $ — $ 290,535 $ 5,671 $ 290,535 $ 5,671 Obligations of states and political subdivisions 6,899 43 1,395,597 115,473 $ 1,402,496 $ 115,516 Residential mortgage-backed securities 124,439 335 2,205,425 289,695 $ 2,329,864 $ 290,030 Commercial mortgage-backed securities 7,118 32 209,632 5,763 $ 216,750 $ 5,795 Corporate bonds and other — — 97,183 5,186 $ 97,183 $ 5,186 Total $ 138,456 $ 410 $ 4,198,372 $ 421,788 $ 4,336,828 $ 422,198 Less than 12 Months 12 Months or Longer Total September 30, 2023 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 4,867 $ 49 $ 480,580 $ 22,053 $ 485,447 $ 22,102 Obligations of states and political subdivisions 53,029 2,568 1,402,097 260,745 1,455,126 263,313 Residential mortgage-backed securities 3,123 106 2,294,112 495,472 2,297,235 495,578 Commercial mortgage-backed securities 1,274 87 304,074 18,104 305,348 18,191 Corporate bonds and other — — 100,753 11,585 100,753 11,585 Total $ 62,293 $ 2,810 $ 4,581,616 $ 807,959 $ 4,643,909 $ 810,769 Less than 12 Months 12 Months or Longer Total December 31, 2023 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 3,477 $ 7 $ 477,306 $ 14,738 $ 480,783 $ 14,745 Obligations of states and political subdivisions 11,855 34 1,427,975 125,148 1,439,830 125,182 Residential mortgage-backed securities 1,631 1 2,361,089 352,882 2,362,720 352,883 Commercial mortgage-backed securities — — 284,324 11,339 284,324 11,339 Corporate bonds and other — — 104,955 7,715 104,955 7,715 Total $ 16,963 $ 42 $ 4,655,649 $ 511,822 $ 4,672,612 $ 511,864 The number of investments in an unrealized loss position totaled 730 at September 30, 2024. We believe any unrealized losses in the U.S. treasury securities, obligations of state and political subdivisions, residential and commercial mortgage-backed and asset-backed investment securities, and corporate bonds and other at September 30, 2024 and 2023, and December 31, 2023, are due to changes in interest rates and not credit-related events. As such, no allowance for credit losses is required on these securities at September 30, 2024 and 2023, and December 31, 2023. Unrealized losses on investment securities are expected to recover over time as these securities approach maturity. Based on evaluations of impaired securities as of September 30, 2024, the Company does not intend to sell any impaired available-for-sale securities before fair value recovers to the current amortized cost, and it is more-likely-than-not that the Company will not be required to sell impaired securities before fair value recovers, which may be maturity. Our mortgage related securities are backed by GNMA, FNMA and FHLMC or are collateralized by securities backed by these agencies. At September 30, 2024, 67.05 % of our available-for-sale securities that are obligations of states and political subdivisions were issued within the State of Texas, of which 56.08 % are guaranteed by the Texas Permanent School Fund. Securities, carried at approximately $ 2,511,801,000 on September 30, 2024, were pledged as collateral for public or trust fund deposits, repurchase agreements, borrowings and for other purposes required or permitted by law. During the three-months ended September 30, 2024 , there were no sales of investment securities that were classified as available-for-sale. During the three-months ended September 30, 2023, sales of investment securities that were classified as available-for-sale were $ 113,132,000 . There were no gross realized security gains or losses from sales and calls during the third quarter of 2024. Gross realized security gains from sales and calls during the third quarter of 2023 totaled $ 53,000 . Gross realized security losses from sales or calls during the third quarter of 2023 totaled $ 1,025,000 . During the nine-months ended September 30, 2024 , there were no sales of investment securities that were classified as available-for-sale. During the nine-months ended September 30, 2023, sales of investment securities that were classified as available-for-sale were $ 320,419,000 . There were no gross realized security gains or losses from sales and calls during the nine-months ended September 30, 2024. Gross realized security gains from sales and calls during the nine-months ended September 30, 2023 totaled $ 1,701,000 . Gross realized security losses from sales or calls during the nine-months ended September 30, 2023 totaled $ 2,615,000 . The specific identification method was used to determ ine cost in order to compute the realized gains and losses.

Loans Held for Investment and_2

Loans Held for Investment and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Loans Held-for-Investment by Portfolio Segment	Loans held-for-investment by portfolio segment are as follows (dollars in thousands): September 30, December 31, 2024 2023 2023 Commercial: C&I $ 1,175,774 $ 1,108,240 $ 1,164,811 Municipal 333,732 218,358 214,850 Total Commercial 1,509,506 1,326,598 1,379,661 Agricultural 83,269 81,876 84,890 Real Estate: Construction & Development 1,013,810 929,570 963,158 Farm 315,720 341,052 344,954 Non-Owner Occupied CRE 825,928 828,900 827,969 Owner Occupied CRE 1,086,750 1,002,913 1,037,281 Residential 2,112,196 1,788,913 1,834,593 Total Real Estate 5,354,404 4,891,348 5,007,955 Consumer: Auto 618,103 540,382 521,859 Non-Auto 157,909 154,492 154,426 Total Consumer 776,012 694,874 676,285 Total Loans 7,723,191 6,994,696 7,148,791 Less: Allowance for credit losses ( 99,936 ) ( 89,714 ) ( 88,734 ) Loans, net $ 7,623,255 $ 6,904,982 $ 7,060,057
Non-Accrual Loans and Loans Still Accruing and Past Due 90 Days or More	The Company’s nonaccrual loans and loans still accruing and past due 90 days or more are as follows (dollars in thousands): September 30, December 31, 2024 2023 2023 Nonaccrual loans $ 63,378 $ 38,812 $ 33,609 Loans still accruing and past due 90 days or more 504 289 1,004 Total nonperforming loans $ 63,882 $ 39,101 $ 34,613
Schedule of Non-Accrual Loans	Nonaccrual loans at September 30, 2024 and 2023, and December 31, 2023, consisted of the following (dollars in thousands): September 30, December 31, 2024 2023 2023 Commercial: C&I $ 3,952 $ 3,365 $ 4,132 Municipal — — — Total Commercial 3,952 3,365 4,132 Agricultural 2,088 838 155 Real Estate: Construction & Development 1,617 3,295 1,444 Farm 4,738 5,534 4,804 Non-Owner Occupied CRE 12,787 8,407 8,022 Owner Occupied CRE 29,411 7,812 6,822 Residential 7,741 8,990 7,649 Total Real Estate 56,294 34,038 28,741 Consumer: Auto 546 465 464 Non-Auto 498 106 117 Total Consumer 1,044 571 581 Total $ 63,378 $ 38,812 $ 33,609
Changes in Allowance for Loan Losses	Summary information on the allowance for credit losses for the three and nine-months ended September 30, 2024 and 2023, are outlined by portfolio segment in the following tables (dollars in thousands): Three-Months Ended September 30, 2024 C&I Municipal Agricultural Construction Farm Beginning balance $ 15,251 $ 239 $ 1,931 $ 23,511 $ 2,902 Provision for loan losses 1,665 ( 42 ) 294 ( 3,164 ) 272 Recoveries 257 — 8 — — Charge-offs ( 398 ) — ( 8 ) — — Ending balance $ 16,775 $ 197 $ 2,225 $ 20,347 $ 3,174 Three-Months Ended September 30, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 13,028 $ 21,054 $ 15,668 $ 1,073 $ 513 $ 95,170 Provision for loan losses 869 1,827 3,243 321 267 5,552 Recoveries 3 38 — 145 42 493 Charge-offs — — ( 174 ) ( 428 ) ( 271 ) ( 1,279 ) Ending balance $ 13,900 $ 22,919 $ 18,737 $ 1,111 $ 551 $ 99,936 Three-Months Ended September 30, 2023 C&I Municipal Agricultural Construction Farm Beginning balance $ 16,530 $ 187 $ 1,082 $ 28,966 $ 2,804 Provision for loan losses ( 64 ) ( 2 ) 53 ( 696 ) 131 Recoveries 56 — 21 6 — Charge-offs ( 715 ) — — — — Ending balance $ 15,807 $ 185 $ 1,156 $ 28,276 $ 2,935 Three-Months Ended September 30, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 13,471 $ 12,572 $ 9,767 $ 829 $ 333 $ 86,541 Provision for loan losses 2,330 767 1,035 172 95 3,821 Recoveries 16 187 3 96 47 432 Charge-offs — — ( 7 ) ( 235 ) ( 123 ) ( 1,080 ) Ending balance $ 15,817 $ 13,526 $ 10,798 $ 862 $ 352 $ 89,714 Nine-Months Ended September 30, 2024 C&I Municipal Agricultural Construction Farm Beginning balance $ 15,698 $ 195 $ 1,281 $ 28,553 $ 2,914 Provision for loan losses 1,376 2 952 ( 8,173 ) 260 Recoveries 545 — 59 — — Charge-offs ( 844 ) — ( 67 ) ( 33 ) — Ending balance $ 16,775 $ 197 $ 2,225 $ 20,347 $ 3,174 Nine-Months Ended September 30, 2024 (continued) Non-Owner Owner Residential Auto Non- Total Beginning balance $ 13,425 $ 13,813 $ 11,654 $ 810 $ 391 $ 88,734 Provision for loan losses 454 8,988 7,168 1,111 580 12,718 Recoveries 34 118 100 346 113 1,315 Charge-offs ( 13 ) — ( 185 ) ( 1,156 ) ( 533 ) ( 2,831 ) Ending balance $ 13,900 $ 22,919 $ 18,737 $ 1,111 $ 551 $ 99,936 Nine-Months Ended September 30, 2023 C&I Municipal Agricultural Construction Farm Beginning balance $ 16,129 $ 1,026 $ 1,041 $ 26,443 $ 1,957 Provision for loan losses 860 ( 841 ) ( 128 ) 1,727 978 Recoveries 221 — 243 106 — Charge-offs ( 1,403 ) — — — — Ending balance $ 15,807 $ 185 $ 1,156 $ 28,276 $ 2,935 Nine-Months Ended September 30, 2023 (continued) Non-Owner Owner Residential Auto Non- Total Beginning balance $ 9,075 $ 9,928 $ 9,075 $ 845 $ 315 $ 75,834 Provision for loan losses 6,679 3,390 1,826 341 218 15,050 Recoveries 63 208 18 329 128 1,316 Charge-offs — — ( 121 ) ( 653 ) ( 309 ) ( 2,486 ) Ending balance $ 15,817 $ 13,526 $ 10,798 $ 862 $ 352 $ 89,714
Schedule of loans that are individually evaluated for credit losses	The Company’s loans that are ind ividually evaluated for credit losses (both collateral and non-collateral dependent) and their related allowances as of September 30, 2024 and 2023, and December 31, 2023, are summarized in the following tables by loan segment (dollars in thousands): September 30, 2024 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 1,137 $ 2,815 $ 21,285 $ 25,237 $ 1,430 $ 3,921 $ 5,351 Municipal — — 373 373 — — — Total Commercial 1,137 2,815 21,658 25,610 1,430 3,921 5,351 Agricultural 278 1,810 1,150 3,238 1,092 636 1,728 Real Estate: Construction & Development 1,091 526 8,404 10,021 35 556 591 Farm 412 4,326 5,586 10,324 546 443 989 Non-Owner Occupied CRE 2,234 10,553 25,607 38,394 1,402 2,047 3,449 Owner Occupied CRE 402 29,009 57,364 86,775 6,709 2,888 9,597 Residential 4,142 3,599 43,439 51,180 644 2,373 3,017 Total Real Estate 8,281 48,013 140,400 196,694 9,336 8,307 17,643 Consumer: Auto — 546 2,562 3,108 1 4 5 Non-Auto — 498 775 1,273 87 78 165 Total Consumer — 1,044 3,337 4,381 88 82 170 Total $ 9,696 $ 53,682 $ 166,545 $ 229,923 $ 11,946 $ 12,946 $ 24,892 September 30, 2023 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 310 $ 3,055 $ 20,476 $ 23,841 $ 2,025 $ 4,651 $ 6,676 Municipal — — 1,377 1,377 — — — Total Commercial 310 3,055 21,853 25,218 2,025 4,651 6,676 Agricultural 215 623 1,278 2,116 58 594 652 Real Estate: Construction & Development 2,678 617 19,912 23,207 139 1,887 2,026 Farm 553 4,981 2,225 7,759 1,070 133 1,203 Non-Owner Occupied CRE 1,991 6,416 28,127 36,534 889 2,665 3,554 Owner Occupied CRE 5,473 2,339 34,988 42,800 400 1,635 2,035 Residential 6,059 2,931 29,453 38,443 281 1,865 2,146 Total Real Estate 16,754 17,284 114,705 148,743 2,779 8,185 10,964 Consumer: Auto — 465 1,858 2,323 1 3 4 Non-Auto — 106 599 705 — 2 2 Total Consumer — 571 2,457 3,028 1 5 6 Total $ 17,279 $ 21,533 $ 140,293 $ 179,105 $ 4,863 $ 13,435 $ 18,298 December 31, 2023 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 1,322 $ 2,810 $ 18,633 $ 22,765 $ 1,363 $ 4,495 $ 5,858 Municipal — — 733 733 — — — Total Commercial 1,322 2,810 19,366 23,498 1,363 4,495 5,858 Agricultural 57 98 1,304 1,459 50 700 750 Real Estate: Construction & Development 758 686 22,545 23,989 148 2,253 2,401 Farm — 4,804 1,362 6,166 937 57 994 Non-Owner Occupied CRE 1,919 6,103 29,117 37,139 700 2,984 3,684 Owner Occupied CRE 4,661 2,161 35,746 42,568 232 1,431 1,663 Residential 3,909 3,740 30,257 37,906 360 1,799 2,159 Total Real Estate 11,247 17,494 119,027 147,768 2,377 8,524 10,901 Consumer: Auto — 464 2,125 2,589 1 3 4 Non-Auto — 117 782 899 — 60 60 Total Consumer — 581 2,907 3,488 1 63 64 Total $ 12,626 $ 20,983 $ 142,604 $ 176,213 $ 3,791 $ 13,782 $ 17,573
Schedule of Allowance for Loan Losses by Portfolio Segment	The Company’s allowance for loans that are individually evaluated for credit losses and collectively evaluated for credit losses as of September 30, 2024 and 2023, and December 31, 2023, are summarized in the following table by loan segment (dollars in thousands). Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. September 30, 2024 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 5,351 $ — $ 1,728 $ 591 $ 989 Loans collectively evaluated for credit losses 11,424 197 497 19,756 2,185 Total $ 16,775 $ 197 $ 2,225 $ 20,347 $ 3,174 September 30, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,449 $ 9,597 $ 3,017 $ 5 $ 165 $ 24,892 Loans collectively evaluated for credit losses 10,451 13,322 15,720 1,106 386 75,044 Total $ 13,900 $ 22,919 $ 18,737 $ 1,111 $ 551 $ 99,936 September 30, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 6,676 $ — $ 652 $ 2,026 $ 1,203 Loans collectively evaluated for credit losses 9,131 185 504 26,250 1,732 Total $ 15,807 $ 185 $ 1,156 $ 28,276 $ 2,935 September 30, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,554 $ 2,035 $ 2,146 $ 4 $ 2 $ 18,298 Loans collectively evaluated for credit losses 12,263 11,491 8,652 858 350 71,416 Total $ 15,817 $ 13,526 $ 10,798 $ 862 $ 352 $ 89,714 December 31, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 5,858 $ — $ 750 $ 2,401 $ 994 Loans collectively evaluated for credit losses 9,840 195 531 26,152 1,920 Total $ 15,698 $ 195 $ 1,281 $ 28,553 $ 2,914 December 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,684 $ 1,663 $ 2,159 $ 4 $ 60 $ 17,573 Loans collectively evaluated for credit losses 9,741 12,150 9,495 806 331 71,161 Total $ 13,425 $ 13,813 $ 11,654 $ 810 $ 391 $ 88,734
Schedule of Investment in Loans Related to Balance in Allowance for Loan Losses on Basis of Company's Impairment Methodology	The Company’s recorded investment in loans as of September 30, 2024 and 2023, and December 31, 2023, related to the balance in the allowance for credit losses follows below (dollars in thousands): September 30, 2024 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 25,237 $ 373 $ 3,238 $ 10,021 $ 10,324 Loans collectively evaluated for credit losses 1,150,537 333,359 80,031 1,003,789 305,396 Total $ 1,175,774 $ 333,732 $ 83,269 $ 1,013,810 $ 315,720 September 30, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 38,394 $ 86,775 $ 51,180 $ 3,108 $ 1,273 $ 229,923 Loans collectively evaluated for credit losses 787,534 999,975 2,061,016 614,995 156,636 7,493,268 Total $ 825,928 $ 1,086,750 $ 2,112,196 $ 618,103 $ 157,909 $ 7,723,191 September 30, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 23,841 $ 1,377 $ 2,116 $ 23,207 $ 7,759 Loans collectively evaluated for credit losses 1,084,399 216,981 79,760 906,363 333,293 Total $ 1,108,240 $ 218,358 $ 81,876 $ 929,570 $ 341,052 September 30, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 36,534 $ 42,800 $ 38,443 $ 2,323 $ 705 $ 179,105 Loans collectively evaluated for credit losses 792,366 960,113 1,750,470 538,059 153,787 6,815,591 Total $ 828,900 $ 1,002,913 $ 1,788,913 $ 540,382 $ 154,492 $ 6,994,696 December 31, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 22,765 $ 733 $ 1,459 $ 23,989 $ 6,166 Loans collectively evaluated for credit losses 1,142,046 214,117 83,431 939,169 338,788 Total $ 1,164,811 $ 214,850 $ 84,890 $ 963,158 $ 344,954 December 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 37,139 $ 42,568 $ 37,906 $ 2,589 $ 899 $ 176,213 Loans collectively evaluated for credit losses 790,830 994,713 1,796,687 519,270 153,527 6,972,578 Total $ 827,969 $ 1,037,281 $ 1,834,593 $ 521,859 $ 154,426 $ 7,148,791
Schedule of Company's Internal Ratings of its Loans Held-for-Investment, Including The Year of Origination, by Portfolio Segments	The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at September 30, 2024 (dollars in millions): September 30, 2024 2023 2022 2021 2020 Prior Revolving Total C&I Risk rating: Pass $ 533 $ 331 $ 175 $ 57 $ 25 $ 30 $ — $ 1,151 Special mention 9 1 — — — — — 10 Substandard 5 3 3 1 1 2 — 15 Doubtful — — — — — — — — Total $ 547 $ 335 $ 178 $ 58 $ 26 $ 32 $ — $ 1,176 Year-to-Date Gross Charge-Offs $ — $ 1 $ — $ — $ — $ — $ — $ 1 September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Municipal Risk rating: Pass $ 131 $ 29 $ 79 $ 13 $ 9 $ 73 $ — $ 334 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 131 $ 29 $ 79 $ 13 $ 9 $ 73 $ — $ 334 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Agricultural Risk rating: Pass $ 53 $ 19 $ 5 $ 2 $ 1 $ — $ — $ 80 Special mention — — — — — — — — Substandard 3 — — — — — — 3 Doubtful — — — — — — — — Total $ 56 $ 19 $ 5 $ 2 $ 1 $ — $ — $ 83 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Construction & Development Risk rating: Pass $ 513 $ 227 $ 180 $ 57 $ 17 $ 9 $ 1 $ 1,004 Special mention 2 — — — — — — 2 Substandard 5 2 1 — — — — 8 Doubtful — — — — — — — — Total $ 520 $ 229 $ 181 $ 57 $ 17 $ 9 $ 1 $ 1,014 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Farm Risk rating: Pass $ 76 $ 44 $ 76 $ 65 $ 20 $ 25 $ — $ 306 Special mention — — — — — — — — Substandard — 1 4 — 4 1 — 10 Doubtful — — — — — — — — Total $ 76 $ 45 $ 80 $ 65 $ 24 $ 26 $ — $ 316 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 147 $ 91 $ 244 $ 155 $ 60 $ 91 $ — $ 788 Special mention 1 — — 1 — 1 — 3 Substandard 3 3 1 7 6 15 — 35 Doubtful — — — — — — — — Total $ 151 $ 94 $ 245 $ 163 $ 66 $ 107 $ — $ 826 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 128 $ 138 $ 279 $ 185 $ 104 $ 166 $ — $ 1,000 Special mention 2 5 — 5 1 1 — 14 Substandard 2 4 42 13 1 11 — 73 Doubtful — — — — — — — — Total $ 132 $ 147 $ 321 $ 203 $ 106 $ 178 $ — $ 1,087 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Residential Risk rating: Pass $ 448 $ 392 $ 392 $ 278 $ 136 $ 246 $ 167 $ 2,059 Special mention 2 1 1 2 — 2 — 8 Substandard 4 7 12 3 4 11 4 45 Doubtful — — — — — — — — Total $ 454 $ 400 $ 405 $ 283 $ 140 $ 259 $ 171 $ 2,112 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Auto Risk rating: Pass $ 271 $ 137 $ 144 $ 45 $ 14 $ 4 $ — $ 615 Special mention — — — — — — — — Substandard — 1 1 1 — — — 3 Doubtful — — — — — — — — Total $ 271 $ 138 $ 145 $ 46 $ 14 $ 4 $ — $ 618 Year-to-Date Gross Charge-Offs $ — $ — $ 1 $ — $ — $ — $ — $ 1 September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Non-Auto Risk rating: Pass $ 59 $ 42 $ 31 $ 15 $ 2 $ 1 $ 7 $ 157 Special mention — — — — — — — — Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 59 $ 42 $ 32 $ 15 $ 2 $ 1 $ 7 $ 158 Year-to-Date Gross Charge-Offs $ — $ — $ 1 $ — $ — $ — $ — $ 1 September 30, 2024 2023 2022 2021 2020 Prior Revolving Total Total Loans Risk rating: Pass $ 2,359 $ 1,450 $ 1,605 $ 872 $ 388 $ 645 $ 175 $ 7,494 Special mention 16 7 1 8 1 4 — 37 Substandard 22 21 65 25 16 40 4 193 Doubtful — — — — — — — — Total $ 2,397 $ 1,478 $ 1,671 $ 905 $ 405 $ 689 $ 179 $ 7,724 Year-to-Date Gross Charge-Offs $ — $ 1 $ 2 $ — $ — $ — $ — $ 3 The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at September 30, 2023 (dollars in millions): September 30, 2023 2022 2021 2020 2019 Prior Revolving Total C&I Risk rating: Pass $ 524 $ 386 $ 94 $ 40 $ 16 $ 24 $ — $ 1,084 Special mention 7 1 — — 1 — — 9 Substandard 2 5 3 2 1 2 — 15 Doubtful — — — — — — — — Total $ 533 $ 392 $ 97 $ 42 $ 18 $ 26 $ — $ 1,108 Year-to-Date Gross Charge-Offs $ — $ — $ 1 $ — $ — $ — $ — $ 1 September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Municipal Risk rating: Pass $ 20 $ 83 $ 16 $ 14 $ 2 82 $ — $ 217 Special mention — — — — — — — — Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 20 $ 83 $ 17 $ 14 $ 2 $ 82 $ — $ 218 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Agricultural Risk rating: Pass $ 42 $ 30 $ 5 $ 2 $ 1 — $ — $ 80 Special mention — — — — — — — — Substandard 1 1 — — — — — 2 Doubtful — — — — — — — — Total $ 43 $ 31 $ 5 $ 2 $ 1 $ — $ — $ 82 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Construction & Development Risk rating: Pass $ 373 $ 401 $ 94 $ 22 $ 10 $ 7 $ — $ 907 Special mention 7 4 — — — — — 11 Substandard 8 3 1 — — — — 12 Doubtful — — — — — — — — Total $ 388 $ 408 $ 95 $ 22 $ 10 $ 7 $ — $ 930 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Farm Risk rating: Pass $ 83 $ 116 $ 75 $ 25 $ 9 $ 25 $ — $ 333 Special mention — — — — — — — — Substandard — 1 1 5 — 1 — 8 Doubtful — — — — — — — — Total $ 83 $ 117 $ 76 $ 30 $ 9 $ 26 $ — $ 341 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 134 $ 240 $ 182 $ 116 $ 45 $ 75 $ — $ 792 Special mention — 4 1 — 11 2 — 18 Substandard 1 1 1 7 2 7 — 19 Doubtful — — — — — — — — Total $ 135 $ 245 $ 184 $ 123 $ 58 $ 84 $ — $ 829 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 81 $ 320 $ 228 $ 118 $ 64 $ 149 $ — $ 960 Special mention 1 — 5 — 3 — — 9 Substandard 3 6 4 — 5 16 — 34 Doubtful — — — — — — — — Total $ 85 $ 326 $ 237 $ 118 $ 72 $ 165 $ — $ 1,003 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Residential Risk rating: Pass $ 368 $ 443 $ 325 $ 165 $ 70 $ 241 $ 139 $ 1,751 Special mention — 2 2 2 — 3 1 10 Substandard 4 5 4 3 2 8 2 28 Doubtful — — — — — — — — Total $ 372 $ 450 $ 331 $ 170 $ 72 $ 252 $ 142 $ 1,789 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Auto Risk rating: Pass $ 168 $ 237 $ 86 $ 32 $ 13 $ 2 $ — $ 538 Special mention — — — — — — — — Substandard — 1 1 — — — — 2 Doubtful — — — — — — — — Total $ 168 $ 238 $ 87 $ 32 $ 13 $ 2 $ — $ 540 Year-to-Date Gross Charge-Offs $ — $ 1 $ — $ — $ — $ — $ — $ 1 September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Auto Risk rating: Pass $ 60 $ 54 $ 26 $ 5 $ 1 $ 1 $ 7 $ 154 Special mention — — — — — — — — Substandard 1 — — — — — — 1 Doubtful — — — — — — — — Total $ 61 $ 54 $ 26 $ 5 $ 1 $ 1 $ 7 $ 155 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — September 30, 2023 2022 2021 2020 2019 Prior Revolving Total Total Loans Risk rating: Pass $ 1,853 $ 2,310 $ 1,131 $ 539 $ 231 $ 606 $ 146 $ 6,816 Special mention 15 11 8 2 15 5 1 57 Substandard 20 23 16 17 10 34 2 122 Doubtful — — — — — — — — Total $ 1,888 $ 2,344 $ 1,155 $ 558 $ 256 $ 645 $ 149 $ 6,995 Year-to-Date Gross Charge-Offs $ — $ 1 $ 1 $ — $ — $ — $ — $ 2 The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at December 31, 2023 (dollars in millions): December 31, 2023 2022 2021 2020 2019 Prior Revolving Total C&I Risk rating: Pass $ 720 $ 276 $ 73 $ 36 $ 14 $ 23 $ — $ 1,142 Special mention 1 1 — — 1 — — 3 Substandard 12 2 2 1 1 2 — 20 Doubtful — — — — — — — — Total $ 733 $ 279 $ 75 $ 37 $ 16 $ 25 $ — $ 1,165 Year-to-Date Gross Charge-Offs $ — $ — $ 1 $ — $ — $ — $ — $ 1 December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Municipal Risk rating: Pass $ 25 $ 83 $ 15 $ 10 $ 1 $ 80 $ — $ 214 Special mention — — — — — — — — Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 25 $ 83 $ 16 $ 10 $ 1 $ 80 $ — $ 215 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Agricultural Risk rating: Pass $ 63 $ 15 $ 4 $ 1 $ 1 $ — $ — $ 84 Special mention — — — — — — — — Substandard 1 — — — — — — 1 Doubtful — — — — — — — — Total $ 64 $ 15 $ 4 $ 1 $ 1 $ — $ — $ 85 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Construction & Development Risk rating: Pass $ 515 $ 311 $ 78 $ 20 $ 9 $ 6 $ — $ 939 Special mention 8 2 — — — — — 10 Substandard 9 4 1 — — — — 14 Doubtful — — — — — — — — Total $ 532 $ 317 $ 79 $ 20 $ 9 $ 6 $ — $ 963 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Farm Risk rating: Pass $ 101 $ 111 $ 73 $ 24 $ 8 $ 22 $ — $ 339 Special mention — — — — — — — — Substandard — — — 5 — 1 — 6 Doubtful — — — — — — — — Total $ 101 $ 111 $ 73 $ 29 $ 8 $ 23 $ — $ 345 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 167 $ 232 $ 172 $ 106 $ 41 $ 73 $ — $ 791 Special mention — 5 1 — — 2 — 8 Substandard 2 1 2 7 13 4 — 29 Doubtful — — — — — — — — Total $ 169 $ 238 $ 175 $ 113 $ 54 $ 79 $ — $ 828 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 154 $ 305 $ 217 $ 114 $ 62 $ 142 $ — $ 994 Special mention 1 1 4 — 1 1 — 8 Substandard 3 6 4 — 7 15 — 35 Doubtful — — — — — — — — Total $ 158 $ 312 $ 225 $ 114 $ 70 $ 158 $ — $ 1,037 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Residential Risk rating: Pass $ 477 $ 415 $ 313 $ 158 $ 67 $ 229 $ 138 $ 1,797 Special mention 1 2 2 2 — 3 1 11 Substandard 4 4 3 3 3 7 3 27 Doubtful — — — — — — — — Total $ 482 $ 421 $ 318 $ 163 $ 70 $ 239 $ 142 $ 1,835 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Auto Risk rating: Pass $ 195 $ 212 $ 74 $ 26 $ 10 $ 2 $ — $ 519 Special mention — — — — — — — — Substandard — 1 1 1 — — — 3 Doubtful — — — — — — — — Total $ 195 $ 213 $ 75 $ 27 $ 10 $ 2 $ — $ 522 Year-to-Date Gross Charge-Offs $ — $ 1 $ — $ — $ — $ — $ — $ 1 December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Auto Risk rating: Pass $ 71 $ 47 $ 22 $ 4 $ 1 $ 1 $ 7 $ 153 Special mention — — — — — — — — Substandard 1 — — — — — — 1 Doubtful — — — — — — — — Total $ 72 $ 47 $ 22 $ 4 $ 1 $ 1 $ 7 $ 154 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — December 31, 2023 2022 2021 2020 2019 Prior Revolving Total Total Loans Risk rating: Pass $ 2,488 $ 2,007 $ 1,041 $ 499 $ 214 $ 578 $ 145 $ 6,972 Special mention 11 11 7 2 2 6 1 40 Substandard 32 18 14 17 24 29 3 137 Doubtful — — — — — — — — Total $ 2,531 $ 2,036 $ 1,062 $ 518 $ 240 $ 613 $ 149 $ 7,149 Year-to-Date Gross Charge-Offs $ — $ 1 $ 1 $ — $ — $ — $ — $ 2
Schedule of Past Due Loans	At September 30, 2024 and 2023, and December 31, 2023, the Company’s past due loans are as follows (dollars in thousands): September 30, 2024 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 3,570 $ 672 $ 1,261 $ 5,503 $ 1,170,271 $ 1,175,774 $ 224 Municipal — — — — 333,732 333,732 — Total Commercial 3,570 672 1,261 5,503 1,504,003 1,509,506 224 Agricultural 192 134 1,617 1,943 81,326 83,269 — Real Estate: Construction & Development 9,116 155 911 10,182 1,003,628 1,013,810 245 Farm 777 — — 777 314,943 315,720 — Non-Owner Occupied CRE 203 87 2,682 2,972 822,956 825,928 — Owner Occupied CRE 4,045 403 1,234 5,682 1,081,068 1,086,750 — Residential 18,074 2,438 515 21,027 2,091,169 2,112,196 35 Total Real Estate 32,215 3,083 5,342 40,640 5,313,764 5,354,404 280 Consumer: Auto 964 79 43 1,086 617,017 618,103 — Non-Auto 220 212 . 432 157,477 157,909 — Total Consumer 1,184 291 43 1,518 774,494 776,012 — Total $ 37,161 $ 4,180 $ 8,263 $ 49,604 $ 7,673,587 $ 7,723,191 $ 504 September 30, 2023 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 5,111 $ 390 $ 1,388 $ 6,889 $ 1,101,351 $ 1,108,240 $ 109 Municipal 481 — — 481 217,877 218,358 — Total Commercial 5,592 390 1,388 7,370 1,319,228 1,326,598 109 Agricultural 187 — 550 737 81,139 81,876 32 Real Estate: Construction & Development 10,037 169 1,986 12,192 917,378 929,570 — Farm 706 — 205 911 340,141 341,052 — Non-Owner Occupied CRE 2,748 — — 2,748 826,152 828,900 — Owner Occupied CRE 1,867 — 476 2,343 1,000,570 1,002,913 — Residential 9,049 1,658 2,067 12,774 1,776,139 1,788,913 148 Total Real Estate 24,407 1,827 4,734 30,968 4,860,380 4,891,348 148 Consumer: Auto 339 176 32 547 539,835 540,382 — Non-Auto 217 2 9 228 154,264 154,492 — Total Consumer 556 178 41 775 694,099 694,874 — Total $ 30,742 $ 2,395 $ 6,713 $ 39,850 $ 6,954,846 $ 6,994,696 $ 289 December 31, 2023 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 8,789 $ 1,624 $ 1,700 $ 12,113 $ 1,152,698 $ 1,164,811 $ 141 Municipal 102 — — 102 214,748 214,850 — Total Commercial 8,891 1,624 1,700 12,215 1,367,446 1,379,661 141 Agricultural 850 246 4 1,100 83,790 84,890 — Real Estate: Construction & Development 8,887 2,115 1,856 12,858 950,300 963,158 863 Farm 1,024 195 — 1,219 343,735 344,954 — Non-Owner Occupied CRE 3,565 — — 3,565 824,404 827,969 — Owner Occupied CRE 2,818 240 1,823 4,881 1,032,400 1,037,281 — Residential 12,293 828 2,816 15,937 1,818,656 1,834,593 — Total Real Estate 28,587 3,378 6,495 38,460 4,969,495 5,007,955 863 Consumer: Auto 1,482 251 24 1,757 520,102 521,859 — Non-Auto 341 51 — 392 154,034 154,426 — Total Consumer 1,823 302 24 2,149 674,136 676,285 — Total $ 40,151 $ 5,550 $ 8,223 $ 53,924 $ 7,094,867 $ 7,148,791 $ 1,004 * The Company monitors commercial, agricultural and real estate loans after such loans are 15 days past due. Consumer loans are monitored after such loans are 30 days past due.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Outstanding Notional Balances and Fair Values of Outstanding Derivative Positions	The following tables provide the outstanding notional balances and fair values of outstanding derivative positions (dollars in thousands): September 30, 2024: Outstanding Asset Liability IRLCs $ 50,053 $ 499 $ — Forward mortgage-backed securities trades 63,000 — 98 September 30, 2023: Outstanding Asset Liability IRLCs $ 35,081 $ 409 $ — Forward mortgage-backed securities trades 45,500 237 — December 31, 2023: Outstanding Asset Liability IRLCs $ 28,956 $ 427 $ — Forward mortgage-backed securities trades 35,000 — 288

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Borrowings	Borrowings consisted of the following (dollars in thousands): September 30, December 31, 2024 2023 2023 Securities sold under agreements with customers to repurchase $ 57,557 $ 621,791 $ 381,928 Federal funds purchased 4,925 108,700 1,100 Other borrowings 21,053 21,053 21,053 Total $ 83,535 $ 751,544 $ 404,081

Stock Based Compensation (Table

Stock Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Changes in Restricted Stock Units	The following table summarizes information about the changes in restricted stock units for the nine-months ended September 30, 2024 and 2023. For the Nine-Months Ended September 30, 2024 2023 Restricted Weighted Restricted Weighted Balance at beginning of period 53,817 $ 37.04 39,657 $ 47.83 Grants 45,064 34.37 33,294 29.53 Vesting ( 24,075 ) 40.35 ( 14,553 ) 48.00 Forfeited/expired ( 2,389 ) 34.80 ( 2,888 ) 47.87 Balance at end of period 72,417 $ 34.35 55,510 $ 36.81
Schedule of Changes in Performance Stock Units	The following table summarizes information about the changes in PSUs as of and for the nine-months ended September 30, 2024 and 2023. For the Nine-Months Ended September 30, 2024 2023 Performance-Based Restricted Weighted Performance-Based Restricted Weighted Balance at beginning of period 75,227 $ 40.24 47,082 $ 48.00 Grants 45,064 34.37 33,294 29.53 Vesting ( 20,532 ) 48.91 — — Forfeited/expired ( 2,493 ) 35.21 ( 3,456 ) 48.04 Balance at end of period 97,266 $ 35.82 76,920 $ 40.01
Summary of Vested and Unvested Restricted Stock Outstanding	The following table summarizes information about vested and unvested restricted stock. For the Nine-Months Ended September 30, 2024 2023 Restricted Weighted Restricted Weighted Balance at beginning of period 25,190 $ 27.79 24,813 $ 36.21 Grants 24,348 30.91 25,190 27.79 Vesting ( 25,190 ) 27.79 ( 17,682 ) 38.54 Forfeited/expired — — ( 1,105 ) 29.70 Balance at end of period 24,348 $ 30.91 31,216 $ 28.25
Schedule of Analysis of Stock Option Activity	An analysis of stock option activity for the nine-months ended September 30, 2024 is presented in the table and narrative below:​​​​​​​ Shares Weighted- Outstanding, December 31, 2023 1,552,249 $ 30.45 Granted 270,495 34.37 Exercised ( 124,887 ) 20.38 Cancelled ( 66,589 ) 34.43 Outstanding, September 30, 2024 1,631,268 31.70 Exercisable, September 30, 2024 960,544 $ 28.30

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s available-for-sale securities, loans held-for-sale, and derivatives which are measured at fair value on a recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands): September 30, 2024 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 293,014 $ — $ — $ 293,014 Obligations of state and political subdivisions — 1,471,483 — 1,471,483 Corporate bonds — 102,471 — 102,471 Residential mortgage-backed securities — 2,423,930 — 2,423,930 Commercial mortgage-backed securities — 316,836 — 316,836 Other securities 4,565 — — 4,565 Total $ 297,579 $ 4,314,720 $ — $ 4,612,299 Loans held-for-sale $ — $ 16,513 $ — $ 16,513 IRLCs $ — $ — $ 499 $ 499 Forward mortgage-backed securities trades $ — $ ( 98 ) $ — $ ( 98 ) September 30, 2023 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 485,447 $ — $ — $ 485,447 Obligations of states and political subdivisions — 1,463,754 — 1,463,754 Corporate bonds — 96,961 — 96,961 Residential mortgage-backed securities — 2,297,235 — 2,297,235 Commercial mortgage-backed securities — 305,348 — 305,348 Other securities 3,792 — — 3,792 Total $ 489,239 $ 4,163,298 $ — $ 4,652,537 Loans held-for-sale $ — $ 11,908 $ — $ 11,908 IRLCs $ — $ — $ 409 $ 409 Forward mortgage-backed securities trades $ — $ 237 $ — $ 237 December 31, 2023 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 482,234 $ — $ — $ 482,234 Obligations of state and political subdivisions — 1,497,157 — 1,497,157 Corporate bonds — 100,471 — 100,471 Residential mortgage-backed securities — 2,364,092 — 2,364,092 Commercial mortgage-backed securities — 284,324 — 284,324 Other securities 4,484 — — 4,484 Total $ 486,718 $ 4,246,044 $ — $ 4,732,762 Loans held-for-sale $ — $ 11,077 $ — $ 11,077 IRLCs $ — $ — $ 427 $ 427 Forward mortgage-backed securities trades $ — $ ( 288 ) $ — $ ( 288 )
Summary of Loans Held-for-Sale at Fair Value	The following table summarizes the Company’s loans held-for-sale at fair value and the net unrealized gains as of the balance sheet dates shown below (dollars in thousands): September 30, December 31, 2024 2023 2023 Unpaid principal balance on loans held-for-sale $ 16,086 $ 11,684 $ 10,757 Net unrealized gains on loans held-for-sale 427 224 320 Loans held-for-sale at fair value $ 16,513 $ 11,908 $ 11,077
Summary of Gain Loss on Sale of Mortgage Loans	The following table summarizes the Company’s gains on sale and fees of mortgage loans for the three and nine-months ended September 30, 2024 and 2023 (dollars in thousand): Three-Months Ended Nine-Months Ended 2024 2023 2024 2023 Realized gain on sale and fees on mortgage loans* $ 3,463 $ 3,485 $ 9,813 $ 9,774 Change in fair value on loans held-for-sale and IRLCs ( 10 ) ( 121 ) 171 24 Change in forward mortgage-backed securities trades ( 94 ) 78 190 152 Total gain on sale of mortgage loans $ 3,359 $ 3,442 $ 10,174 $ 9,950 * This includes gains on loans held-for-sale carried under the fair value method and lower of cost or market.
Schedule of Estimated Fair Values and Carrying Values of All Financial Instruments	The estimated fair values and carrying values of all financial instruments under current authoritative guidance were as follows (dollars in thousands). September 30, December 31, 2024 2023 2023 Carrying Value Estimated Carrying Estimated Carrying Estimated Fair Value Cash and due from banks $ 296,188 $ 296,188 $ 208,277 $ 208,277 $ 281,354 $ 281,354 Level 1 Interest-bearing demand deposits 287,476 287,476 180,008 180,008 255,237 255,237 Level 1 Available-for-sale securities 4,612,299 4,612,299 4,652,537 4,652,537 4,732,762 4,732,762 Levels 1 Loans held-for-investment, net of 7,623,255 7,607,920 6,904,982 6,890,218 7,060,057 7,036,722 Level 3 Loans held-for-sale 20,114 20,293 12,229 12,266 14,253 14,378 Level 2 Accrued interest receivable 56,427 56,427 53,518 53,518 58,544 58,544 Level 2 Deposits with stated maturities 1,009,667 1,011,199 1,004,227 1,002,893 938,980 938,534 Level 2 Deposits with no stated maturities 10,746,194 10,746,194 9,712,296 9,712,296 10,199,320 10,199,320 Level 1 Repurchase Agreements 57,557 57,557 621,791 621,791 381,928 381,928 Level 2 Borrowings 25,978 25,978 129,753 129,753 22,153 22,153 Level 2 Accrued interest payable 9,502 9,502 13,557 13,557 10,215 10,215 Level 2 IRLCs 499 499 409 409 427 427 Level 3 Forward mortgage-backed securities ( 98 ) ( 98 ) 237 237 ( 288 ) ( 288 ) Level 2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail)	1 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Jul. 27, 2021 shares	Sep. 30, 2024 USD ($) Location shares	Sep. 30, 2023 USD ($) shares	Dec. 31, 2023 USD ($)
Equity, Class of Treasury Stock [Line Items]
Number of locations | Location					79
Minimum number of shares that company is required to repurchase | shares				0
Amount of allowance for credit loss	$ 0	$ 0	$ 0		$ 0	$ 0	$ 0
Shares repurchased and retired average price | $ / shares	$ 26.99
Minimum number of days to consider the loans as non-accrual					90 days	90 days
Impairment recorded					$ 0	$ 0
Other identifiable intangible assets, amortized period (years)		7 years			7 years
Securities sold under agreements to repurchase maturity range (in days)					one to four days
Interest-bearing time deposits, maturity period (in days)					90 days or less
Unrealized net losses in available-for-sale securities, included in accumulated other comprehensive income	$ 639,934,000	$ 329,817,000	$ 639,934,000		$ 329,817,000	$ 639,934,000	403,298,000
First financial antidilutive securities excluded from eps computation | shares		375,000	864,000		449,000	478,000
Shares repurchased under stock repurchase authorization, shares | shares	101,337
Deferred Tax Assets	$ 173,032,000	$ 94,239,000	$ 173,032,000		$ 94,239,000	$ 173,032,000	110,800,000
Commitments to Extend Credit [Member]
Equity, Class of Treasury Stock [Line Items]
Reserve for unfunded commitments	7,903,000	8,004,000	7,903,000		8,004,000	7,903,000	7,903,000
Held-to-maturity Securities [Member]
Equity, Class of Treasury Stock [Line Items]
Securities held to maturity	$ 0	$ 0	$ 0		$ 0	$ 0	$ 0
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized to be repurchased | shares				5,000,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Computation of Basic EPS to Dilutive EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net earnings per share, basic, Net Earnings	$ 55,308	$ 49,556	$ 161,190	$ 152,997
Effect of stock options and stock grants, Net Earnings	0	0	0	0
Net earnings per share, diluted, Net Earnings	$ 55,308	$ 49,556	$ 161,190	$ 152,997
Net earnings per share, basic, Weighted Average Shares	142,853,215	142,707,260	142,797,621	142,691,389
Effect of stock options and stock grants, Weighted Average Shares	335,642	442,113	362,031	351,469
Net earnings per share, diluted, Weighted Average Shares	143,188,857	143,149,373	143,159,652	143,042,858
Net earnings per share, basic, Per Share Amount	$ 0.39	$ 0.35	$ 1.13	$ 1.07
Effect of stock options and stock grants, Per Share Amount	0		0	0
Net earnings per share, diluted, Per Share Amount	$ 0.39	$ 0.35	$ 1.13	$ 1.07

Securities - Additional Informa

Securities - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) Investment	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Investment	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Interest Bearing Time Deposits In Banks And Securities [Line Items]
Interest bearing time deposits in banks	$ 0	$ 0	$ 0	$ 0	$ 0
Interest-bearing time deposits, maturity period, years	12 months	12 months	12 months	12 months	12 months
Number of investment positions | Investment	730		730
Securities pledged as collateral	$ 2,511,801,000		$ 2,511,801,000
Sales of investment securities available-for-sale			0	$ 320,419,000
Gross realized gains from security sales	0	$ 53,000	0	1,701,000
Gross realized losses from security sales or calls		1,025,000		2,615,000
Available-for-Sale Securities [Member]
Interest Bearing Time Deposits In Banks And Securities [Line Items]
Sales of investment securities available-for-sale	$ 0	$ 113,132,000	$ 0	$ 320,419,000
Obligations of State and Political Subdivisions [Member] | Texas [Member]
Interest Bearing Time Deposits In Banks And Securities [Line Items]
Percentage of securities guaranteed by Texas Permanent School Fund	56.08%		56.08%
Obligations of State and Political Subdivisions [Member] | Texas [Member] | Available-for-Sale Securities [Member] | Geographic Concentration Risk [Member]
Interest Bearing Time Deposits In Banks And Securities [Line Items]
Concentration risk, percentage			67.05%

Securities - Summary of Availab

Securities - Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	$ 5,030,124	$ 5,243,681	$ 5,463,186
Securities available-for-sale, Gross Unrealized Holding Gains	4,373	945	120
Securities available-for-sale, Gross Unrealized Holding Losses	(422,198)	(511,864)	(810,769)
Estimated Fair Value	4,612,299	4,732,762	4,652,537
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	298,671	496,975	507,549
Securities available-for-sale, Gross Unrealized Holding Gains	14	4	0
Securities available-for-sale, Gross Unrealized Holding Losses	(5,671)	(14,745)	(22,102)
Estimated Fair Value	293,014	482,234	485,447
Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	1,586,300	1,621,405	1,726,947
Securities available-for-sale, Gross Unrealized Holding Gains	699	934	120
Securities available-for-sale, Gross Unrealized Holding Losses	(115,516)	(125,182)	(263,313)
Estimated Fair Value	1,471,483	1,497,157	1,463,754
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	2,712,305	2,716,968	2,792,813
Securities available-for-sale, Gross Unrealized Holding Gains	1,655	7	0
Securities available-for-sale, Gross Unrealized Holding Losses	(290,030)	(352,883)	(495,578)
Estimated Fair Value	2,423,930	2,364,092	2,297,235
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	320,685	295,663	323,539
Securities available-for-sale, Gross Unrealized Holding Gains	1,946	0	0
Securities available-for-sale, Gross Unrealized Holding Losses	(5,795)	(11,339)	(18,191)
Estimated Fair Value	316,836	284,324	305,348
Corporate Bonds and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	112,163	112,670	112,338
Securities available-for-sale, Gross Unrealized Holding Gains	59	0	0
Securities available-for-sale, Gross Unrealized Holding Losses	(5,186)	(7,715)	(11,585)
Estimated Fair Value	$ 107,036	$ 104,955	$ 100,753

Securities - Carrying Value and

Securities - Carrying Value and Estimated Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Due within one year	$ 281,764
Due after one year through five years	1,758,382
Due after five years through ten years	2,167,043
Due after ten years	822,935
Total	5,030,124
Available-for-Sale, Estimated Fair Value, Due within one year	278,517
Available-for-Sale, Estimated Fair Value, Due after one year through five years	1,662,649
Available-for-Sale, Estimated Fair Value, Due after five years through ten years	1,955,247
Available-for-Sale, Estimated Fair Value, Due after ten years	715,886
Available-for-Sale, Estimated Fair Value, Total	$ 4,612,299	$ 4,732,762	$ 4,652,537

Securities - Continuous Unreali

Securities - Continuous Unrealized-Loss Position of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value	$ 138,456	$ 16,963	$ 62,293
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	410	42	2,810
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	4,198,372	4,655,649	4,581,616
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	421,788	511,822	807,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total	4,336,828	4,672,612	4,643,909
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	422,198	511,864	810,769
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value	0	3,477	4,867
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	0	7	49
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	290,535	477,306	480,580
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	5,671	14,738	22,053
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total	290,535	480,783	485,447
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	5,671	14,745	22,102
Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value	6,899	11,855	53,029
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	43	34	2,568
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	1,395,597	1,427,975	1,402,097
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	115,473	125,148	260,745
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total	1,402,496	1,439,830	1,455,126
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	115,516	125,182	263,313
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value	124,439	1,631	3,123
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	335	1	106
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	2,205,425	2,361,089	2,294,112
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	289,695	352,882	495,472
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total	2,329,864	2,362,720	2,297,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	290,030	352,883	495,578
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value	7,118	0	1,274
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	32	0	87
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	209,632	284,324	304,074
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	5,763	11,339	18,104
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total	216,750	284,324	305,348
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	5,795	11,339	18,191
Corporate Bonds and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value	0	0	0
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	0	0	0
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	97,183	104,955	100,753
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	5,186	7,715	11,585
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total	97,183	104,955	100,753
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	$ 5,186	$ 7,715	$ 11,585

Loans Held for Investment and_3

Loans Held for Investment and Allowance for Loan Losses - Loans Held-for-Investment by Class of Financing Receivables (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 7,723,191	$ 7,148,791	$ 6,994,696
Less-Allowance for credit losses	(99,936)	(88,734)	(89,714)
Net loans held-for-investment	7,623,255	7,060,057	6,904,982
C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,175,774	1,164,811	1,108,240
Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	333,732	214,850	218,358
Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,013,810	963,158	929,570
Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	315,720	344,954	341,052
Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	825,928	827,969	828,900
Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,086,750	1,037,281	1,002,913
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	2,112,196	1,834,593	1,788,913
Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	618,103	521,859	540,382
Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	157,909	154,426	154,492
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,509,506	1,379,661	1,326,598
Commercial [Member] | C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,175,774	1,164,811	1,108,240
Commercial [Member] | Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	333,732	214,850	218,358
Agriculture [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	83,269	84,890	81,876
Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	5,354,404	5,007,955	4,891,348
Real Estate [Member] | Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,013,810	963,158	929,570
Real Estate [Member] | Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	315,720	344,954	341,052
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	825,928	827,969	828,900
Real Estate [Member] | Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,086,750	1,037,281	1,002,913
Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	2,112,196	1,834,593	1,788,913
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	776,012	676,285	694,874
Net loans held-for-investment	7,623,255	7,060,057	6,904,982
Consumer [Member] | Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	618,103	521,859	540,382
Consumer [Member] | Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 157,909	$ 154,426	$ 154,492

Loans Held for Investment and_4

Loans Held for Investment and Allowance for Loan Losses - Non-Accrual Loans, Loans Still Accruing and Past Due 90 Days or More and Restructured Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Receivables [Abstract]
Nonaccrual loans	$ 63,378	$ 33,609	$ 38,812
Loans still accruing and past due 90 days or more	504	1,004	289
Total	$ 63,882	$ 34,613	$ 39,101

Loans Held for Investment and_5

Loans Held for Investment and Allowance for Loan Losses - Schedule of Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 63,378	$ 33,609	$ 38,812
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	3,952	4,132	3,365
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	3,952	4,132	3,365
Commercial [Member] | Muncipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	0	0	0
Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	2,088	155	838
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	56,294	28,741	34,038
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	1,617	1,444	3,295
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	4,738	4,804	5,534
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	12,787	8,022	8,407
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	29,411	6,822	7,812
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	7,741	7,649	8,990
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	1,044	581	571
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	546	464	465
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non accrual loans	$ 498	$ 117	$ 106

Loans Held for Investment and_6

Loans Held for Investment and Allowance for Loan Losses - Changes in Allowance for Loan Losses (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 95,170,000	$ 86,541,000	$ 88,734,000	$ 75,834,000
Provision for loan losses	5,552,000	3,821,000	12,718,000	15,050,000
Recoveries	493,000	432,000	1,315,000	1,316,000
Charge-offs	(1,279,000)	(1,080,000)	(2,831,000)	(2,486,000)
Ending balance	99,936,000	89,714,000	99,936,000	89,714,000
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	15,251,000	16,530,000	15,698,000	16,129,000
Provision for loan losses	1,665,000	(64,000)	1,376,000	860,000
Recoveries	257,000	56,000	545,000	221,000
Charge-offs	(398,000)	(715,000)	(844,000)	(1,403,000)
Ending balance	16,775,000	15,807,000	16,775,000	15,807,000
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	239,000	187,000	195,000	1,026,000
Provision for loan losses	(42,000)	(2,000)	2,000	(841,000)
Recoveries	0	0	0	0
Charge-offs	0	0	0	0
Ending balance	197,000	185,000	197,000	185,000
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,931,000	1,082,000	1,281,000	1,041,000
Provision for loan losses	294,000	53,000	952,000	(128,000)
Recoveries	8,000	21,000	59,000	243,000
Charge-offs	(8,000)	0	(67,000)	0
Ending balance	2,225,000	1,156,000	2,225,000	1,156,000
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	23,511,000	28,966,000	28,553,000	26,443,000
Provision for loan losses	(3,164,000)	(696,000)	(8,173,000)	1,727,000
Recoveries	0	6,000	0	106,000
Charge-offs	0	0	(33,000)	0
Ending balance	20,347,000	28,276,000	20,347,000	28,276,000
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,902,000	2,804,000	2,914,000	1,957,000
Provision for loan losses	272,000	131,000	260,000	978,000
Recoveries	0	0	0	0
Charge-offs	0	0	0	0
Ending balance	3,174,000	2,935,000	3,174,000	2,935,000
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	13,028,000	13,471,000	13,425,000	9,075,000
Provision for loan losses	869,000	2,330,000	454,000	6,679,000
Recoveries	3,000	16,000	34,000	63,000
Charge-offs	0	0	(13,000)	0
Ending balance	13,900,000	15,817,000	13,900,000	15,817,000
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	21,054,000	12,572,000	13,813,000	9,928,000
Provision for loan losses	1,827,000	767,000	8,988,000	3,390,000
Recoveries	38,000	187,000	118,000	208,000
Charge-offs	0	0	0	0
Ending balance	22,919,000	13,526,000	22,919,000	13,526,000
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	15,668,000	9,767,000	11,654,000	9,075,000
Provision for loan losses	3,243,000	1,035,000	7,168,000	1,826,000
Recoveries	0	3,000	100,000	18,000
Charge-offs	(174,000)	(7,000)	(185,000)	(121,000)
Ending balance	18,737,000	10,798,000	18,737,000	10,798,000
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,073,000	829,000	810,000	845,000
Provision for loan losses	321,000	172,000	1,111,000	341,000
Recoveries	145,000	96,000	346,000	329,000
Charge-offs	(428,000)	(235,000)	(1,156,000)	(653,000)
Ending balance	1,111,000	862,000	1,111,000	862,000
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	513,000	333,000	391,000	315,000
Provision for loan losses	267,000	95,000	580,000	218,000
Recoveries	42,000	47,000	113,000	128,000
Charge-offs	(271,000)	(123,000)	(533,000)	(309,000)
Ending balance	$ 551,000	$ 352,000	$ 551,000	$ 352,000

Loans Held for Investment and_7

Loans Held for Investment and Allowance for Loan Losses - Schedule of Loans that are Individually Evaluated for Credit Losses (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Related Allowance	$ 24,892	$ 18,298	$ 17,573
Average Recorded Investment		179,105
Average Recorded Investment	229,923
Average Recorded Investment			176,213
Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		17,279
Recorded Investment With No Allowance	9,696
Recorded Investment With No Allowance			12,626
Recorded Investment With Allowance	53,682	21,533	20,983
Related Allowance	11,946	4,863	3,791
Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	12,946	13,435	13,782
Average Recorded Investment		140,293
Average Recorded Investment	166,545
Average Recorded Investment			142,604
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	5,351	6,676	5,858
Average Recorded Investment		25,218
Average Recorded Investment	25,610		23,498
Commercial [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		310
Recorded Investment With No Allowance	1,137		1,322
Recorded Investment With Allowance	2,815	3,055	2,810
Related Allowance	1,430	2,025	1,363
Commercial [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,921	4,651	4,495
Average Recorded Investment		21,853
Average Recorded Investment	21,658		19,366
Commercial [Member] | C&I [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	5,351	6,676	5,858
Average Recorded Investment		23,841
Average Recorded Investment	25,237		22,765
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		310
Recorded Investment With No Allowance	1,137		1,322
Recorded Investment With Allowance	2,815	3,055	2,810
Related Allowance	1,430	2,025	1,363
Commercial [Member] | C&I [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,921	4,651	4,495
Average Recorded Investment		20,476
Average Recorded Investment	21,285		18,633
Commercial [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0
Average Recorded Investment		1,377
Average Recorded Investment	373		733
Commercial [Member] | Municipal [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		1,377
Average Recorded Investment			733
Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,728	652	750
Average Recorded Investment		2,116
Average Recorded Investment	3,238		1,459
Agriculture [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		215
Recorded Investment With No Allowance	278		57
Recorded Investment With Allowance	1,810	623	98
Related Allowance	1,092	58	50
Agriculture [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	636	594	700
Average Recorded Investment		1,278
Average Recorded Investment	1,150		1,304
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	17,643	10,964	10,901
Average Recorded Investment		148,743
Average Recorded Investment	196,694		147,768
Real Estate [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		16,754
Recorded Investment With No Allowance	8,281		11,247
Recorded Investment With Allowance	48,013	17,284	17,494
Related Allowance	9,336	2,779	2,377
Real Estate [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	8,307	8,185	8,524
Average Recorded Investment		114,705
Average Recorded Investment	140,400		119,027
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	591	2,026	2,401
Average Recorded Investment		23,207
Average Recorded Investment	10,021		23,989
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		2,678
Recorded Investment With No Allowance	1,091		758
Recorded Investment With Allowance	526	617	686
Related Allowance	35	139	148
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	556	1,887	2,253
Average Recorded Investment		19,912
Average Recorded Investment	8,404		22,545
Real Estate [Member] | Farm [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	989	1,203	994
Average Recorded Investment		7,759
Average Recorded Investment	10,324		6,166
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		553
Recorded Investment With No Allowance	412
Recorded Investment With Allowance	4,326	4,981	4,804
Related Allowance	546	1,070	937
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	443	133	57
Average Recorded Investment		2,225
Average Recorded Investment	5,586		1,362
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,449	3,554	3,684
Average Recorded Investment		36,534
Average Recorded Investment	38,394		37,139
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		1,991
Recorded Investment With No Allowance	2,234		1,919
Recorded Investment With Allowance	10,553	6,416	6,103
Related Allowance	1,402	889	700
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,047	2,665	2,984
Average Recorded Investment		28,127
Average Recorded Investment	25,607		29,117
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	9,597	2,035	1,663
Average Recorded Investment		42,800
Average Recorded Investment	86,775		42,568
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		5,473
Recorded Investment With No Allowance	402		4,661
Recorded Investment With Allowance	29,009	2,339	2,161
Related Allowance	6,709	400	232
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,888	1,635	1,431
Average Recorded Investment		34,988
Average Recorded Investment	57,364		35,746
Real Estate [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,017	2,146	2,159
Average Recorded Investment		38,443
Average Recorded Investment	51,180		37,906
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		6,059
Recorded Investment With No Allowance	4,142		3,909
Recorded Investment With Allowance	3,599	2,931	3,740
Related Allowance	644	281	360
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,373	1,865	1,799
Average Recorded Investment		29,453
Average Recorded Investment	43,439		30,257
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	170	6	64
Average Recorded Investment		3,028
Average Recorded Investment	4,381		3,488
Consumer [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		0
Recorded Investment With No Allowance	0
Recorded Investment With Allowance	1,044	571	581
Related Allowance	88	1	1
Consumer [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	82	5	63
Average Recorded Investment		2,457
Average Recorded Investment	3,337		2,907
Consumer [Member] | Auto [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	5	4	4
Average Recorded Investment		2,323
Average Recorded Investment	3,108		2,589
Consumer [Member] | Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		0
Recorded Investment With No Allowance	0
Recorded Investment With Allowance	546	465	464
Related Allowance	1	1	1
Consumer [Member] | Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4	3	3
Average Recorded Investment		1,858
Average Recorded Investment	2,562		2,125
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	165	2	60
Average Recorded Investment		705
Average Recorded Investment	1,273		899
Consumer [Member] | Non-Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0
Recorded Investment With Allowance	498	106	117
Related Allowance	87
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	78	2	60
Average Recorded Investment		$ 599
Average Recorded Investment	$ 775		$ 782

Loans Held for Investment and_8

Loans Held for Investment and Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	$ 24,892	$ 17,573	$ 18,298
Loans collectively evaluated for credit losses	75,044	71,161	71,416
Total allowance for loan losses	99,936	88,734	89,714
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	5,351	5,858	6,676
Loans collectively evaluated for credit losses	11,424	9,840	9,131
Total allowance for loan losses	16,775	15,698	15,807
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	0
Loans collectively evaluated for credit losses	197	195	185
Total allowance for loan losses	197	195	185
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	591	2,401	2,026
Loans collectively evaluated for credit losses	19,756	26,152	26,250
Total allowance for loan losses	20,347	28,553	28,276
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	989	994	1,203
Loans collectively evaluated for credit losses	2,185	1,920	1,732
Total allowance for loan losses	3,174	2,914	2,935
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	3,449	3,684	3,554
Loans collectively evaluated for credit losses	10,451	9,741	12,263
Total allowance for loan losses	13,900	13,425	15,817
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	9,597	1,663	2,035
Loans collectively evaluated for credit losses	13,322	12,150	11,491
Total allowance for loan losses	22,919	13,813	13,526
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	3,017	2,159	2,146
Loans collectively evaluated for credit losses	15,720	9,495	8,652
Total allowance for loan losses	18,737	11,654	10,798
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	5	4	4
Loans collectively evaluated for credit losses	1,106	806	858
Total allowance for loan losses	1,111	810	862
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	165	60	2
Loans collectively evaluated for credit losses	386	331	350
Total allowance for loan losses	551	391	352
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	1,728	750	652
Loans collectively evaluated for credit losses	497	531	504
Total allowance for loan losses	$ 2,225	$ 1,281	$ 1,156

Loans Held for Investment and_9

Loans Held for Investment and Allowance for Loan Losses - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, past due 90 days or more and still accruing, restructured loans and foreclosed assets	$ 64,417,000	$ 39,698,000	$ 64,417,000	$ 39,698,000	$ 35,096,000
Additional funds advanced in connection with impaired loans	0		0
Loans held by subsidiaries subject to blanket liens	5,256,833,000		5,256,833,000
Available line of credit	2,196,671,000		2,196,671,000
Undisbursed commitments	641,500,000		641,500,000
Reserve for unfunded commitments (Other liabilities)	8,004,000	7,903,000	8,004,000	7,903,000	$ 7,903,000
Provision for loan losses	5,552,000	3,821,000	12,718,000	15,050,000
Unfunded Loan Commitment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses	6,123,000	2,276,000	12,817,000	10,631,000
Reversal of Provision for credit losses	$ 571,000	$ 1,545,000	$ 101,000	$ 4,419,000

Loans Held for Investment an_10

Loans Held for Investment and Allowance for Loan Losses - Schedule of Investment in Loans Related to Balance in Allowance for Loan Losses on Basis of Company's Impairment Methodology (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	$ 229,923	$ 176,213	$ 179,105
Loans collectively evaluated for credit losses	7,493,268	6,972,578	6,815,591
Total Loans	7,723,191	7,148,791	6,994,696
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	25,237	22,765	23,841
Loans collectively evaluated for credit losses	1,150,537	1,142,046	1,084,399
Total Loans	1,175,774	1,164,811	1,108,240
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	373	733	1,377
Loans collectively evaluated for credit losses	333,359	214,117	216,981
Total Loans	333,732	214,850	218,358
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	10,021	23,989	23,207
Loans collectively evaluated for credit losses	1,003,789	939,169	906,363
Total Loans	1,013,810	963,158	929,570
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	10,324	6,166	7,759
Loans collectively evaluated for credit losses	305,396	338,788	333,293
Total Loans	315,720	344,954	341,052
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	38,394	37,139	36,534
Loans collectively evaluated for credit losses	787,534	790,830	792,366
Total Loans	825,928	827,969	828,900
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	86,775	42,568	42,800
Loans collectively evaluated for credit losses	999,975	994,713	960,113
Total Loans	1,086,750	1,037,281	1,002,913
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	51,180	37,906	38,443
Loans collectively evaluated for credit losses	2,061,016	1,796,687	1,750,470
Total Loans	2,112,196	1,834,593	1,788,913
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	3,108	2,589	2,323
Loans collectively evaluated for credit losses	614,995	519,270	538,059
Total Loans	618,103	521,859	540,382
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	1,273	899	705
Loans collectively evaluated for credit losses	156,636	153,527	153,787
Total Loans	157,909	154,426	154,492
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	3,238	1,459	2,116
Loans collectively evaluated for credit losses	80,031	83,431	79,760
Total Loans	83,269	84,890	81,876
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	5,354,404	5,007,955	4,891,348
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	1,013,810	963,158	929,570
Real Estate [Member] | Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	315,720	344,954	341,052
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	825,928	827,969	828,900
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	1,086,750	1,037,281	1,002,913
Real Estate [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	2,112,196	1,834,593	1,788,913
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	776,012	676,285	694,874
Consumer [Member] | Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	618,103	521,859	540,382
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	$ 157,909	$ 154,426	$ 154,492

Loans Held-for-Investment and A

Loans Held-for-Investment and Allowance for Loan Losses - Schedule of Company's Internal Ratings of its Loans Held-for-Investment, Including The Year of Origination, by Portfolio Segments (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 2,397	$ 2,531	$ 1,888
2023	1,478	2,036	2,344
2022	1,671	1,062	1,155
2021	905	518	558
2020	405	240	256
Prior	689	613	645
Revolving Loans Amortized Cost Basis	179	149	149
Total	7,724	7,149	6,995
Charge-Off [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1	1	1
2022	2	1	1
Total	3	2	2
C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	547	733	533
2023	335	279	392
2022	178	75	97
2021	58	37	42
2020	26	16	18
Prior	32	25	26
Total	1,176	1,165	1,108
C&I [Member] | Charge-Off [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1
2022		1	1
Total	1	1	1
Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	131	25	20
2023	29	83	83
2022	79	16	17
2021	13	10	14
2020	9	1	2
Prior	73	80	82
Total	334	215	218
Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	56	64	43
2023	19	15	31
2022	5	4	5
2021	2	1	2
2020	1	1	1
Total	83	85	82
Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	520	532	388
2023	229	317	408
2022	181	79	95
2021	57	20	22
2020	17	9	10
Prior	9	6	7
Revolving Loans Amortized Cost Basis	1
Total	1,014	963	930
Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	76	101	83
2023	45	111	117
2022	80	73	76
2021	65	29	30
2020	24	8	9
Prior	26	23	26
Total	316	345	341
Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	151	169	135
2023	94	238	245
2022	245	175	184
2021	163	113	123
2020	66	54	58
Prior	107	79	84
Total	826	828	829
Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	132	158	85
2023	147	312	326
2022	321	225	237
2021	203	114	118
2020	106	70	72
Prior	178	158	165
Total	1,087	1,037	1,003
Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	454	482	372
2023	400	421	450
2022	405	318	331
2021	283	163	170
2020	140	70	72
Prior	259	239	252
Revolving Loans Amortized Cost Basis	171	142	142
Total	2,112	1,835	1,789
Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	271	195	168
2023	138	213	238
2022	145	75	87
2021	46	27	32
2020	14	10	13
Prior	4	2	2
Total	618	522	540
Auto [Member] | Charge-Off [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023			1
2022	1	1
Total	1	1	1
Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	59	72	61
2023	42	47	54
2022	32	22	26
2021	15	4	5
2020	2	1	1
Prior	1	1	1
Revolving Loans Amortized Cost Basis	7	7	7
Total	158	154	155
Non-Auto [Member] | Charge-Off [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1
Total	1
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,359	2,488	1,853
2023	1,450	2,007	2,310
2022	1,605	1,041	1,131
2021	872	499	539
2020	388	214	231
Prior	645	578	606
Revolving Loans Amortized Cost Basis	175	145	146
Total	7,494	6,972	6,816
Pass [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	533	720	524
2023	331	276	386
2022	175	73	94
2021	57	36	40
2020	25	14	16
Prior	30	23	24
Total	1,151	1,142	1,084
Pass [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	131	25	20
2023	29	83	83
2022	79	15	16
2021	13	10	14
2020	9	1	2
Prior	73	80	82
Total	334	214	217
Pass [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	53	63	42
2023	19	15	30
2022	5	4	5
2021	2	1	2
2020	1	1	1
Total	80	84	80
Pass [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	513	515	373
2023	227	311	401
2022	180	78	94
2021	57	20	22
2020	17	9	10
Prior	9	6	7
Revolving Loans Amortized Cost Basis	1
Total	1,004	939	907
Pass [Member] | Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	76	101	83
2023	44	111	116
2022	76	73	75
2021	65	24	25
2020	20	8	9
Prior	25	22	25
Total	306	339	333
Pass [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	147	167	134
2023	91	232	240
2022	244	172	182
2021	155	106	116
2020	60	41	45
Prior	91	73	75
Total	788	791	792
Pass [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	128	154	81
2023	138	305	320
2022	279	217	228
2021	185	114	118
2020	104	62	64
Prior	166	142	149
Total	1,000	994	960
Pass [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	448	477	368
2023	392	415	443
2022	392	313	325
2021	278	158	165
2020	136	67	70
Prior	246	229	241
Revolving Loans Amortized Cost Basis	167	138	139
Total	2,059	1,797	1,751
Pass [Member] | Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	271	195	168
2023	137	212	237
2022	144	74	86
2021	45	26	32
2020	14	10	13
Prior	4	2	2
Total	615	519	538
Pass [Member] | Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	59	71	60
2023	42	47	54
2022	31	22	26
2021	15	4	5
2020	2	1	1
Prior	1	1	1
Revolving Loans Amortized Cost Basis	7	7	7
Total	157	153	154
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	16	11	15
2023	7	11	11
2022	1	7	8
2021	8	2	2
2020	1	2	15
Prior	4	6	5
Revolving Loans Amortized Cost Basis	0	1	1
Total	37	40	57
Special Mention [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9	1	7
2023	1	1	1
2022	0	0
2020		1	1
Total	10	3	9
Special Mention [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020			0
Total			0
Special Mention [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024			0
2023			0
Total	0		0
Special Mention [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2	8	7
2023		2	4
Total	2	10	11
Special Mention [Member] | Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2021			0
Total			0
Special Mention [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1		0
2023		5	4
2022		1	1
2021	1
2020			11
Prior	1	2	2
Total	3	8	18
Special Mention [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2	1
2023	5	1
2022		4	5
2021	5	0
2020	1	1	3
Prior	1	1	0
Total	14	8	9
Special Mention [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2	1
2023	1	2	2
2022	1	2	2
2021	2	2	2
Prior	2	3	3
Revolving Loans Amortized Cost Basis		1	1
Total	8	11	10
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	22	32	20
2023	21	18	23
2022	65	14	16
2021	25	17	17
2020	16	24	10
Prior	40	29	34
Revolving Loans Amortized Cost Basis	4	3	2
Total	193	137	122
Substandard [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5	12	2
2023	3	2	5
2022	3	2	3
2021	1	1	2
2020	1	1	1
Prior	2	2	2
Total	15	20	15
Substandard [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1	1
Total		1	1
Substandard [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3	1	1
2023			1
Total	3	1	2
Substandard [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5	9	8
2023	2	4	3
2022	1	1	1
Total	8	14	12
Substandard [Member] | Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1		1
2022	4		1
2021		5	5
2020	4
Prior	1	1	1
Total	10	6	8
Substandard [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3	2	1
2023	3	1	1
2022	1	2	1
2021	7	7	7
2020	6	13	2
Prior	15	4	7
Total	35	29	19
Substandard [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2	3	3
2023	4	6	6
2022	42	4	4
2021	13	0	0
2020	1	7	5
Prior	11	15	16
Total	73	35	34
Substandard [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	4	4	4
2023	7	4	5
2022	12	3	4
2021	3	3	3
2020	4	3	2
Prior	11	7	8
Revolving Loans Amortized Cost Basis	4	3	2
Total	45	27	28
Substandard [Member] | Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1	1	1
2022	1	1	1
2021	1	1
Total	3	3	2
Substandard [Member] | Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		1	1
2022	1
Total	$ 1	$ 1	$ 1

Loans Held for Investment an_11

Loans Held for Investment and Allowance for Loan Losses - Schedule of Past Due Loans (Detail) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 7,724,000	$ 7,149,000	$ 6,995,000
Total Loans		7,723,191	7,148,791	6,994,696
Total 90 Days Past Due Still Accruing		504	1,004	289
C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,176,000	1,165,000	1,108,000
Total Loans		1,175,774	1,164,811	1,108,240
Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		334,000	215,000	218,000
Total Loans		333,732	214,850	218,358
Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,014,000	963,000	930,000
Total Loans		1,013,810	963,158	929,570
Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		316,000	345,000	341,000
Total Loans		315,720	344,954	341,052
Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		826,000	828,000	829,000
Total Loans		825,928	827,969	828,900
Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,087,000	1,037,000	1,003,000
Total Loans		1,086,750	1,037,281	1,002,913
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,112,000	1,835,000	1,789,000
Total Loans		2,112,196	1,834,593	1,788,913
Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		618,000	522,000	540,000
Total Loans		618,103	521,859	540,382
Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		158,000	154,000	155,000
Total Loans		157,909	154,426	154,492
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,504,003
Total Loans		1,509,506	1,379,661	1,326,598
Total 90 Days Past Due Still Accruing		224	141	109
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,170,271
Total Loans		1,175,774	1,164,811	1,108,240
Total 90 Days Past Due Still Accruing		224	141	109
Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		333,732
Total Loans		333,732	214,850	218,358
Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		81,326
Total Loans		83,269	84,890	81,876
Total 90 Days Past Due Still Accruing				32
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,313,764
Total Loans		5,354,404	5,007,955	4,891,348
Total 90 Days Past Due Still Accruing		280	863	148
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,003,628
Total Loans		1,013,810	963,158	929,570
Total 90 Days Past Due Still Accruing		245	863
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		314,943
Total Loans		315,720	344,954	341,052
Total 90 Days Past Due Still Accruing		0
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		822,956
Total Loans		825,928	827,969	828,900
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,081,068
Total Loans		1,086,750	1,037,281	1,002,913
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,091,169
Total Loans		2,112,196	1,834,593	1,788,913
Total 90 Days Past Due Still Accruing		35		148
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		774,494
Total Loans		776,012	676,285	694,874
Total 90 Days Past Due Still Accruing		0		0
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		617,017
Total Loans		618,103	521,859	540,382
Total 90 Days Past Due Still Accruing		0
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		157,477
Total Loans		157,909	154,426	154,492
Total 90 Days Past Due Still Accruing		0		0
15-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	37,161	40,151	30,742
15-59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	3,570	8,891	5,592
15-59 Days Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	3,570	8,789	5,111
15-59 Days Past Due [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	0	102	481
15-59 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	192	850	187
15-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	32,215	28,587	24,407
15-59 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	9,116	8,887	10,037
15-59 Days Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	777	1,024	706
15-59 Days Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	203	3,565	2,748
15-59 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	4,045	2,818	1,867
15-59 Days Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	18,074	12,293	9,049
15-59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	1,184	1,823	556
15-59 Days Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	964	1,482	339
15-59 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	220	341	217
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		4,180	5,550	2,395
60-89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		672	1,624	390
60-89 Days Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		672	1,624	390
60-89 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		134	246	0
60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,083	3,378	1,827
60-89 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		155	2,115	169
60-89 Days Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			195	0
60-89 Days Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		87
60-89 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		403	240	0
60-89 Days Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,438	828	1,658
60-89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		291	302	178
60-89 Days Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		79	251	176
60-89 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		212	51	2
Greater than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		8,263	8,223	6,713
Greater than 90 Days [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,261	1,700	1,388
Greater than 90 Days [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,261	1,700	1,388
Greater than 90 Days [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,617	4	550
Greater than 90 Days [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,342	6,495	4,734
Greater than 90 Days [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		911	1,856	1,986
Greater than 90 Days [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0		205
Greater than 90 Days [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,682		0
Greater than 90 Days [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,234	1,823	476
Greater than 90 Days [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		515	2,816	2,067
Greater than 90 Days [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		43	24	41
Greater than 90 Days [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		43	24	32
Greater than 90 Days [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due				9
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		49,604	53,924	39,850
Total Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,503	12,215	7,370
Total Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,503	12,113	6,889
Total Past Due [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	102	481
Total Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,943	1,100	737
Total Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		40,640	38,460	30,968
Total Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		10,182	12,858	12,192
Total Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		777	1,219	911
Total Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,972	3,565	2,748
Total Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,682	4,881	2,343
Total Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		21,027	15,937	12,774
Total Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,518	2,149	775
Total Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,086	1,757	547
Total Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		432	392	228
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 7,673,587	7,094,867	6,954,846
Current [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			1,367,446	1,319,228
Current [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			1,152,698	1,101,351
Current [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			214,748	217,877
Current [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			83,790	81,139
Current [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			4,969,495	4,860,380
Current [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			950,300	917,378
Current [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			343,735	340,141
Current [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			824,404	826,152
Current [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			1,032,400	1,000,570
Current [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			1,818,656	1,776,139
Current [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			674,136	694,099
Current [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			520,102	539,835
Current [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			$ 154,034	$ 154,264
[1] The Company monitors commercial, agricultural and real estate loans after such loans are 15 days past due. Consumer loans are monitored after such loans are 30 days past due.

Loans Held for Sale - Additiona

Loans Held for Sale - Additional Information (Detail) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Loans Receivables Held For Sale Net [Abstract]
Loans held for sale	$ 20,114,000	$ 14,253,000	$ 12,229,000
Loans held-for-sale at the lower of cost or fair value	$ 3,601,000	$ 3,176,000	$ 321,000

Derivative Financial Instrume_3

Derivative Financial Instruments - Summary of Outstanding Notional Balances and Fair Values of Outstanding Derivative Positions (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
IRLCs [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding Notional Balance	$ 50,053	$ 28,956	$ 35,081
Asset Derivative Fair Value	499	427	409
Liability Derivative Fair Value	0	0	0
Forward Mortgage-Backed Securities Trades [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding Notional Balance	63,000	35,000	45,500
Asset Derivative Fair Value	0	0	237
Liability Derivative Fair Value	$ 98	$ 288	$ 0

Borrowings - Schedule of Borrow

Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Debt Disclosure [Abstract]
Securities sold under agreements with customers to repurchase	$ 57,557	$ 381,928	$ 621,791
Federal funds purchased	4,925	1,100	108,700
Other borrowings	21,053	21,053	21,053
Total	$ 83,535	$ 404,081	$ 751,544

Borrowings - Additional Informa

Borrowings - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2024 USD ($)
Line of Credit Facility [Line Items]
Revolving line of credit, permitted	$ 25,000,000
Line of credit	0
Other borrowings	$ 21,053,000
Line of credit, maturity date	Jun. 30, 2023

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Income Taxes [Line Items]
Federal statutory tax rate			21%
Income tax expense	$ 12,028,000	$ 10,848,000	$ 34,664,000	$ 34,291,000
Effective tax rates on pre-tax income	17.86%	17.96%	17.70%	18.31%
Initial capital contribution commitment			$ 5,500,000
Initial contribution included in other assets			2,091,000	$ 539,000	$ 615,000
Leveraged loan, invest in other borrowings	$ 21,053,000		$ 21,053,000
NMTC Investments [Member]
Income Taxes [Line Items]
Tax Benefit Percent of Qualified Investments			0.39
Investment related liabilities	24,759,000	$ 26,009,000	$ 24,759,000	26,009,000	25,738,000
FFB Paris Investment Fund, LLC [Member]
Income Taxes [Line Items]
Loan investment	18,000,000	18,000,000	18,000,000	18,000,000	18,000,000
Leveraged loan, invest in other borrowings	$ 21,053,000	$ 21,053,000	$ 21,053,000	$ 21,053,000	$ 21,053,000

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Apr. 27, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option vesting rate			20%
Duration of options granted, years			10 years
Stock options outstanding, exercise price range, lower			$ 16.95
Stock options outstanding, exercise price range, upper			$ 48.91
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan	$ 5,888,000		$ 5,888,000
Weighted-average period of unrecognized compensation cost recognition, years			1 year 4 months 9 days
Total fair value of shares vested			$ 2,131,000	$ 2,110,000
Stock compensation expense	546,000	$ 391,000	1,516,000	1,280,000
Dividends Payable	25,739,000	25,730,000	25,739,000	25,730,000	$ 25,712,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement amount in assets	50,000,000,000		50,000,000,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement amount in assets	$ 10,000,000,000		$ 10,000,000,000
Two Thousand Twenty One Omnibus Stock and Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock for issuance under the plan	1,214,226		1,214,226			2,500,000
2021 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option vesting rate			20%
Other Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends Payable	$ 112,000	107,000	$ 112,000	107,000	$ 124,000
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	OTHER LIABILITIES		OTHER LIABILITIES
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vested			$ 2,276,000	940,000
Restricted Stock [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 187,000	175,000	$ 537,000	492,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting period			2 years
Percentage of option vesting rate			20%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option vesting rate			33.30%
Performance Shares [Member] | Executives And Other Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting period			3 years
Criteria period			3 years
Average adjusted earnings per share growth percentage			50%
Return on average assets			100%
Performance Shares [Member] | Executives And Other Officers [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued Upon Vesting Based On Core Return Percentage			200%
Performance Shares [Member] | Executives And Other Officers [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued Upon Vesting Based On Core Return Percentage			0%
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option vesting rate			33.30%
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan	4,920,000	3,998,000	$ 4,920,000	$ 3,998,000
Weighted-average period of unrecognized compensation cost recognition, years			1 year 2 months 8 days	1 year 3 months 7 days
Restricted Stock Units [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 521,000	$ 483,000	$ 1,381,000	$ 1,261,000

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Changes in Stock Units (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	25,190	24,813
Grants	24,348	25,190
Vesting	(25,190)	(17,682)
Forfeited/expired	0	(1,105)
Balance at end of period	24,348	31,216
Balance at beginning of period	$ 27.79	$ 36.21
Weighted Average Grant Date Fair Value, Grants	30.91	27.79
Weighted Average Grant Date Fair Value, Vesting	27.79	38.54
Weighted Average Grant Date Fair Value, Forfeited/expired	0	29.7
Balance at end of period	$ 30.91	$ 28.25
Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	53,817	39,657
Grants	45,064	33,294
Vesting	(24,075)	(14,553)
Forfeited/expired	(2,389)	(2,888)
Balance at end of period	72,417	55,510
Balance at beginning of period	$ 37.04	$ 47.83
Weighted Average Grant Date Fair Value, Grants	34.37	29.53
Weighted Average Grant Date Fair Value, Vesting	40.35	48
Weighted Average Grant Date Fair Value, Forfeited/expired	34.8	47.87
Balance at end of period	$ 34.35	$ 36.81
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	75,227	47,082
Grants	45,064	33,294
Vesting	(20,532)	0
Forfeited/expired	(2,493)	(3,456)
Balance at end of period	97,266	76,920
Balance at beginning of period	$ 40.24	$ 48
Weighted Average Grant Date Fair Value, Grants	34.37	29.53
Weighted Average Grant Date Fair Value, Vesting	48.91	0
Weighted Average Grant Date Fair Value, Forfeited/expired	35.21	48.04
Balance at end of period	$ 35.82	$ 40.01

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Vested and Unvested Restricted Stock Outstanding (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Balance at beginning of period	25,190	24,813
Grants	24,348	25,190
Vesting	(25,190)	(17,682)
Forfeited/expired	0	(1,105)
Balance at end of period	24,348	31,216
Balance at beginning of period	$ 27.79	$ 36.21
Grants	30.91	27.79
Vesting	27.79	38.54
Forfeited/expired	0	29.7
Balance at end of period	$ 30.91	$ 28.25

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of Analysis of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Share-Based Payment Arrangement [Abstract]
Outstanding, beginning of period, Shares | shares	1,552,249
Shares, Granted | shares	270,495
Exercised, Shares | shares	(124,887)
Cancelled, Shares | shares	(66,589)
Outstanding, end of period, Shares | shares	1,631,268
Exercisable at end ofperiod, Shares | shares	960,544
Outstanding, beginning of period, Weighted-Average Ex. Price | $ / shares	$ 30.45
Granted, Weighted-Average Ex. Price | $ / shares	34.37
Exercised, Weighted-Average Ex. Price | $ / shares	20.38
Cancelled, Weighted-Average Ex. Price | $ / shares	34.43
Outstanding, end of period, Weighted-Average Ex. Price | $ / shares	31.7
Exercisable at end of period, Weighted-Average Ex. Price | $ / shares	$ 28.3

Fair Value Disclosures - Additi

Fair Value Disclosures - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Loans	Sep. 30, 2023 USD ($) Loans	Dec. 31, 2023 USD ($) Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets transfer between Level 2 and Level 3	$ 0	$ 0	$ 0	$ 0	$ 0
Other real estate owned, total	501,000	15,000	501,000	15,000	$ 483,000
Real state owned			1,156,000	190,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real state owned			$ 0	$ 0
Residential Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of loans held-for-sale | Loans			0	0	0
Recognized credit losses	$ 0	$ 0	$ 0	$ 0
Minimum [Member] | Measurement Input, Discount Rate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt discounts, percentage	5		5
Maximum [Member] | Measurement Input, Discount Rate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt discounts, percentage	25		25

Fair Value Disclosures - Financ

Fair Value Disclosures - Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Available-for-sale investment securities:
Estimated Fair Value	$ 4,612,299,000	$ 4,732,762,000	$ 4,652,537,000
Loans held for sale	20,114,000	14,253,000	12,229,000
U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	293,014,000	482,234,000	485,447,000
Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Estimated Fair Value	1,471,483,000	1,497,157,000	1,463,754,000
Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	2,423,930,000	2,364,092,000	2,297,235,000
Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	316,836,000	284,324,000	305,348,000
IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	499,000	427,000	409,000
Forward mortgage-backed securities trades asset (liability)	0	0	0
Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	0	0	237,000
Forward mortgage-backed securities trades asset (liability)	98,000	288,000	0
Fair Value, Measurements, Recurring [Member]
Available-for-sale investment securities:
Estimated Fair Value	4,612,299,000	4,732,762,000	4,652,537,000
Loans held for sale	16,513,000	11,077,000	11,908,000
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	293,014,000	482,234,000	485,447,000
Fair Value, Measurements, Recurring [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Estimated Fair Value	1,471,483,000	1,497,157,000	1,463,754,000
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	2,423,930,000	2,364,092,000	2,297,235,000
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	316,836,000	284,324,000	305,348,000
Fair Value, Measurements, Recurring [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	499,000	427,000	409,000
Fair Value, Measurements, Recurring [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Forward mortgage-backed securities trades asset (liability)	(98,000)	(288,000)	237,000
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Estimated Fair Value	102,471,000	100,471,000	96,961,000
Fair Value, Measurements, Recurring [Member] | Collateralized Securities, Other [Member]
Available-for-sale investment securities:
Estimated Fair Value	4,565,000	4,484,000	3,792,000
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Available-for-sale investment securities:
Estimated Fair Value	297,579,000	486,718,000	489,239,000
Loans held for sale	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	293,014,000	482,234,000	485,447,000
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Forward mortgage-backed securities trades asset (liability)	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Collateralized Securities, Other [Member]
Available-for-sale investment securities:
Estimated Fair Value	4,565,000	4,484,000	3,792,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Available-for-sale investment securities:
Estimated Fair Value	4,314,720,000	4,246,044,000	4,163,298,000
Loans held for sale	16,513,000	11,077,000	11,908,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Estimated Fair Value	1,471,483,000	1,497,157,000	1,463,754,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	2,423,930,000	2,364,092,000	2,297,235,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	316,836,000	284,324,000	305,348,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Forward mortgage-backed securities trades asset (liability)	(98,000)	(288,000)	237,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Estimated Fair Value	102,471,000	100,471,000	96,961,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Collateralized Securities, Other [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Loans held for sale	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	499,000	427,000	409,000
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Forward mortgage-backed securities trades asset (liability)	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Collateralized Securities, Other [Member]
Available-for-sale investment securities:
Estimated Fair Value	$ 0	$ 0	$ 0

Fair Value Disclosures - Summar

Fair Value Disclosures - Summary of Loans Held-for-Sale at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Fair Value Measurements Loans Held For Sale [Abstract]
Unpaid principal balance on loans held-for-sale	$ 16,086	$ 10,757	$ 11,684
Net unrealized gains on loans held-for-sale	427	320	224
Loans held-for-sale at fair value	$ 16,513	$ 11,077	$ 11,908

Fair Value Disclosures - Schedu

Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 3,463	$ 3,485	$ 9,813	$ 9,774
Change in fair value on loans held-for-sale and IRLCs		(10)	(121)	171	24
Change in forward mortgage-backed securities trades		(94)	78	190	152
Total gain on sale of mortgage loans		$ 3,359	$ 3,442	$ 10,174	$ 9,950
[1] This includes gains on loans held-for-sale carried under the fair value method and lower of cost or market.

Fair Value Disclosures - Sche_2

Fair Value Disclosures - Schedule of Estimated Fair Values and Carrying Values of All Financial Instruments (Detail) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 296,188,000	$ 208,277,000	$ 281,354,000
Interest-bearing demand deposits in banks	287,476,000	180,008,000	255,237,000
Estimated Fair Value	4,612,299,000	4,652,537,000	4,732,762,000
Loans held-for-investment, net of allowance for credit losses	7,623,255,000	6,904,982,000	7,060,057,000
Loans held for sale	20,114,000	12,229,000	14,253,000
Borrowings	25,978,000	129,753,000	22,153,000
IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRLCs	499,000	409,000	427,000
Forward mortgage-backed securities trades asset (liability)	0	0	0
Forward Mortgage-Backed Securities Trades [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRLCs	0	237,000	0
Forward mortgage-backed securities trades asset (liability)	98,000	0	288,000
Carrying Value [Member] | Level 1 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	296,188,000	208,277,000	281,354,000
Interest-bearing demand deposits in banks	287,476,000	180,008,000	255,237,000
Deposits with no stated maturities	10,746,194,000	9,712,296,000	10,199,320,000
Carrying Value [Member] | Level 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	20,114,000	12,229,000	14,253,000
Accrued interest receivable	56,427,000	53,518,000	58,544,000
Deposits with stated maturities	1,009,667,000	1,004,227,000	938,980,000
Repurchase Agreements	57,557,000	621,791,000	381,928,000
Borrowings	25,978,000	129,753,000	22,153,000
Accrued interest payable	9,502,000	13,557,000	10,215,000
Carrying Value [Member] | Level 2 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Forward mortgage-backed securities trades asset (liability)	(98,000)	237,000	(288,000)
Carrying Value [Member] | Levels 1 and 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	4,612,299,000	4,652,537,000	4,732,762,000
Carrying Value [Member] | Level 3 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-investment, net of allowance for credit losses	7,623,255,000	6,904,982,000	7,060,057,000
Carrying Value [Member] | Level 3 Inputs [Member] | IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRLCs	499,000	409,000	427,000
Estimated Fair Value [Member] | Level 1 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	296,188,000	208,277,000	281,354,000
Interest-bearing demand deposits in banks	287,476,000	180,008,000	255,237,000
Deposits with no stated maturities	10,746,194,000	9,712,296,000	10,199,320,000
Estimated Fair Value [Member] | Level 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	20,293,000	12,266,000	14,378,000
Accrued interest receivable	56,427,000	53,518,000	58,544,000
Deposits with stated maturities	1,011,199,000	1,002,893,000	938,534,000
Repurchase Agreements	57,557,000	621,791,000	381,928,000
Borrowings	25,978,000	129,753,000	22,153,000
Accrued interest payable	9,502,000	13,557,000	10,215,000
Estimated Fair Value [Member] | Level 2 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Forward mortgage-backed securities trades asset (liability)	(98,000)	237,000	(288,000)
Estimated Fair Value [Member] | Levels 1 and 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	4,612,299,000	4,652,537,000	4,732,762,000
Estimated Fair Value [Member] | Level 3 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-investment, net of allowance for credit losses	7,607,920,000	6,890,218,000	7,036,722,000
Estimated Fair Value [Member] | Level 3 Inputs [Member] | IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRLCs	$ 499,000	$ 409,000	$ 427,000