First Financial Bankshares (FFIN) 10-Q 3 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	May 03, 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	Q1
Current Fiscal Year End Date	--12-31
Document Period End Date	Mar. 31, 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		142,841,009

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
ASSETS
CASH AND DUE FROM BANKS	$ 222,464,000	$ 281,354,000	$ 224,875,000
FEDERAL FUNDS SOLD	12,300,000	0	0
INTEREST-BEARING DEMAND DEPOSITS IN BANKS	365,397,000	255,237,000	221,336,000
Total cash and cash equivalents	600,161,000	536,591,000	446,211,000
SECURITIES AVAILABLE-FOR-SALE, at fair value (amortized cost of these securities was $5,217,517, $5,879,040, and $5,243,681 as of March 31, 2024 and 2023, and December 31, 2023, respectively)	4,658,526,000	4,732,762,000	5,298,557,000
LOANS:
Held-for-investment	7,229,410,000	7,148,791,000	6,576,215,000
Less—allowance for credit losses	(89,562,000)	(88,734,000)	(80,818,000)
Net loans held for investment	7,139,848,000	7,060,057,000	6,495,397,000
Held-for-sale ($15,080, $11,766 and $11,077, at fair value at March 31, 2024 and 2023, and December 31, 2023, respectively)	16,109,000	14,253,000	11,996,000
BANK PREMISES AND EQUIPMENT, net	151,953,000	151,788,000	153,718,000
INTANGIBLE ASSETS, net	314,465,000	314,622,000	315,306,000
OTHER ASSETS	310,096,000	295,521,000	286,801,000
Total assets	13,191,158,000	13,105,594,000	13,007,986,000
LIABILITIES AND SHAREHOLDERS' EQUITY
NONINTEREST-BEARING DEPOSITS	3,348,147,000	3,435,586,000	3,890,991,000
INTEREST-BEARING DEPOSITS	7,941,661,000	7,702,714,000	7,045,427,000
Total deposits	11,289,808,000	11,138,300,000	10,936,418,000
DIVIDENDS PAYABLE	25,754,000	25,712,000	24,274,000
REPURCHASE AGREEMENTS	307,297,000	381,928,000	608,299,000
BORROWINGS	26,803,000	22,153,000	24,628,000
OTHER LIABILITIES	50,129,000	38,601,000	41,514,000
Total liabilities	11,699,791,000	11,606,694,000	11,635,133,000
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY:
COMMON STOCK - ($0.01 par value, authorized 200,000,000 shares; 142,817,159, 142,703,531, and 142,716,939 shares issued at March 31, 2024 and 2023, and December 31, 2023, respectively)	1,428,000	1,427,000	1,427,000
CAPITAL SURPLUS	683,997,000	681,246,000	679,429,000
RETAINED EARNINGS	1,247,169,000	1,219,525,000	1,150,246,000
TREASURY STOCK (shares at cost: 931,427, 927,789 and 930,152 at March 31, 2024 and 2023, and December 31, 2023, respectively)	(12,120,000)	(11,855,000)	(11,271,000)
DEFERRED COMPENSATION	12,120,000	11,855,000	11,271,000
ACCUMULATED OTHER COMPREHENSIVE EARNINGS (LOSS), net	(441,227,000)	(403,298,000)	(458,249,000)
Total shareholders' equity	1,491,367,000	1,498,900,000	1,372,853,000
Total liabilities and shareholders' equity	$ 13,191,158,000	$ 13,105,594,000	$ 13,007,986,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Statement of Financial Position [Abstract]
Securities, Available-for-sale, Amortized Cost	$ 5,217,517	$ 5,243,681	$ 5,879,040
Loans held-for-sale, fair value	$ 15,080	$ 11,077	$ 11,766
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	142,817,159	142,716,939	142,703,531
Treasury stock, shares	931,427	930,152	927,789

Consolidated Statements of Earn

Consolidated Statements of Earnings (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
INTEREST INCOME:
Interest and fees on loans	$ 117,091,000	$ 89,009,000
Interest on investment securities:
Taxable	19,952,000	20,782,000
Exempt from federal income tax	7,737,000	10,067,000
Interest on federal funds sold and interest-bearing demand deposits in banks	4,715,000	1,650,000
Total interest income	149,495,000	121,508,000
INTEREST EXPENSE:
Interest on deposits	45,251,000	21,812,000
Interest on repurchase agreements and borrowings	4,002,000	3,410,000
Total interest expense	49,253,000	25,222,000
Net interest income	100,242,000	96,286,000
Provision for credit losses	808,000	2,781,000
Net interest income after provision for credit losses	99,434,000	93,505,000
NONINTEREST INCOME:
Trust fees	11,379,000	9,845,000
Service charges on deposit accounts	6,246,000	6,036,000
Debit card fees	4,891,000	4,936,000
Credit card fees	631,000	609,000
Gain on sale and fees on mortgage loans	3,128,000	2,974,000
Net gain on sale of available-for-sale securities	0	12,000
Net gain on sale of foreclosed assets	0	34,000
Net gain on sale of other assets	0	930,000
Interest on loan recoveries	555,000	346,000
Other	2,553,000	2,285,000
Total noninterest income	29,383,000	28,007,000
NONINTEREST EXPENSE:
Salaries, commissions and employee benefits	36,683,000	31,461,000
Net occupancy expense	3,470,000	3,430,000
Equipment expense	2,237,000	2,127,000
FDIC insurance premiums	1,965,000	1,654,000
Debit card expense	3,058,000	3,199,000
Professional and service fees	2,396,000	2,365,000
Printing, stationery and supplies	447,000	710,000
Operational and other losses	1,154,000	931,000
Software amortization and expense	3,005,000	2,311,000
Amortization of intangible assets	157,000	228,000
Other	9,368,000	8,840,000
Total noninterest expense	63,940,000	57,256,000
EARNINGS BEFORE INCOME TAXES	64,877,000	64,256,000
INCOME TAX EXPENSE	11,480,000	11,688,000
NET EARNINGS	$ 53,397,000	$ 52,568,000
NET EARNINGS PER SHARE, BASIC	$ 0.37	$ 0.37
NET EARNINGS PER SHARE, DILUTED	0.37	0.37
DIVIDENDS PER SHARE	$ 0.18	$ 0.17

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Earnings (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
NET EARNINGS	$ 53,397	$ 52,568
OTHER ITEMS OF COMPREHENSIVE EARNINGS (LOSS):
Change in unrealized gain (loss) on investment securities available-for-sale, before income taxes	(48,011)	97,454
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings, before income taxes	0	(12)
Total other items of comprehensive earnings (loss)	(48,011)	97,442
Income tax benefit (expense) related to:
Change in unrealized gain (loss) on investment securities available-for-sale	10,082	(20,466)
Reclassification adjustment for realized gains (losses) on investment securities included in net earnings	0	3
Total income tax benefit (expense)	10,082	(20,463)
COMPREHENSIVE EARNINGS (LOSS)	$ 15,468	$ 129,547

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 earnings (Unaudited)	52,568			52,568
Stock option exercises (unaudited)	884		884
Stock option exercises, Shares		45,660
Cash dividends declared	(24,267)			(24,267)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	76,979						76,979
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (236)	236
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					1,421
Stock- based compensation expense (unaudited)	952		952
Ending Balance at Mar. 31, 2023	$ 1,372,853	$ 1,427	679,429	1,150,246	$ (11,271)	11,271	(458,249)
Ending Balance, Shares at Mar. 31, 2023		142,703,531
Treasury Stock, Ending Balance, Shares at Mar. 31, 2023	(927,789)				(927,789)
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 earnings (Unaudited)	$ 53,397			53,397
Stock option exercises (unaudited)	1,623		1,622
Stock option exercises, Shares		100,220
Cash dividends declared	(25,753)			(25,753)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	(37,929)						(37,929)
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (265)	265
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					(1,275)
Stock- based compensation expense (unaudited)	1,129		1,129
Ending Balance at Mar. 31, 2024	$ 1,491,367	$ 1,428	$ 683,997	$ 1,247,169	$ (12,120)	$ 12,120	$ (441,227)
Ending Balance, Shares at Mar. 31, 2024		142,817,159
Treasury Stock, Ending Balance, Shares at Mar. 31, 2024	(931,427)				(931,427)

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash dividend per share	$ 0.18	$ 0.17
Retained Earnings [Member]
Cash dividend per share	$ 0.18	$ 0.17

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 53,397	$ 52,568
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	3,221	3,074
Provision for credit losses	808	2,781
Securities premium amortization, net	11,153	13,770
Gain on sale of securities and other assets, net	0	(976)
Stock-based compensation	1,129	952
Net tax benefit from stock-based compensation	102	93
Change in loans held-for-sale	(1,797)	48
Change in other assets	(4,245)	15,851
Change in other liabilities	11,875	7,755
Total adjustments	22,246	43,348
Net cash provided by operating activities	75,643	95,916
Activity in available-for-sale securities:
Sales	0	145,948
Maturities	3,644,519	116,922
Purchases	(3,629,507)	(3,298)
Net increase in loans held-for-investment	(80,652)	(133,974)
Purchases of bank premises, equipment and software	(3,912)	(6,347)
Proceeds from sale of bank premises and equipment and other assets	41	2,423
Net cash provided by (used in) investing activities	(69,511)	121,674
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in noninterest-bearing deposits	(87,439)	(170,797)
Net increase in interest-bearing deposits	238,947	101,708
Net increase (decrease) in repurchase agreements and borrowings	(69,981)	(9,581)
Common stock transactions:
Proceeds from stock option exercises/stock unit conversions/restricted stock activity	1,623	884
Dividends paid	(25,712)	(24,271)
Net cash provided by (used in) financing activities	57,438	(102,057)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	63,570	115,533
CASH AND CASH EQUIVALENTS, beginning of period	536,591	330,678
CASH AND CASH EQUIVALENTS, end of period	600,161	446,211
SUPPLEMENTAL INFORMATION AND NONCASH TRANSACTIONS:
Interest paid	51,106	22,726
Transfer of loans to other real estate	$ 454	$ 175

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 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 one bank with 79 locations located in Texas as of March 31, 2024 . The Company’s subsidiary bank is First Financial Bank. 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 27, 2021, the Company’s Board of Directors authorized the repurchase of up to 5,000,000 common shares through July 31, 2023. On July 25, 2023, the Company's Board of Directors renewed the prior authorization through July 31, 2024. 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 current authorization, the Company has 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-months ended March 31, 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 March 31, 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 March 31, 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 judgement, 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 March 31, 2024 and 2023, and December 31, 2023, the Company’s reserve for unfunded commitments totaled $ 7,455,000 , $ 10,397,000 and $ 7,903,000 , respectively, which 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 three-months ended March 31, 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 $ 441,227,000 , $ 458,249,000 and $ 403,298,000 at March 31, 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 liabilities and gives current recognition to changes in tax rates and laws. As

Securities

Securities	3 Months Ended
	Mar. 31, 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): March 31, 2024 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 445,399 $ — $ ( 13,231 ) $ 432,168 Obligations of states and political subdivisions 1,592,523 570 ( 139,058 ) 1,454,035 Residential mortgage-backed securities 2,685,896 72 ( 386,691 ) 2,299,277 Commercial mortgage-backed securities 381,198 52 ( 12,344 ) 368,906 Corporate bonds and other 112,501 — ( 8,361 ) 104,140 Total securities available-for-sale $ 5,217,517 $ 694 $ ( 559,685 ) $ 4,658,526 March 31, 2023 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 508,692 $ 32 $ ( 20,482 ) $ 488,242 Obligations of states and political subdivisions 1,935,401 1,562 ( 163,351 ) 1,773,612 Residential mortgage-backed securities 2,957,314 17 ( 374,161 ) 2,583,170 Commercial mortgage-backed securities 364,956 — ( 15,020 ) 349,936 Corporate bonds and other 112,677 — ( 9,080 ) 103,597 Total securities available-for-sale $ 5,879,040 $ 1,611 $ ( 582,094 ) $ 5,298,557 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 March 31, 2024, March 31, 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 March 31, 2024 and 2023, and December 31, 2023, were computed by using scheduled amortization of balances and historical prepayment rates. The amortized cost and estimated fair value of available-for-sale securities at March 31, 2024, by contractual and expected maturity, are shown below (dollars in thousands): Amortized Estimated Cost Basis Fair Value Due within one year $ 343,112 $ 337,823 Due after one year through five years 1,374,546 1,288,485 Due after five years through ten years 2,421,721 2,126,343 Due after ten years 1,078,138 905,875 Total $ 5,217,517 $ 4,658,526 The following tables disclose as of March 31, 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 March 31, 2024 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 2,438 $ 16 $ 429,730 $ 13,215 $ 432,168 $ 13,231 Obligations of states and political subdivisions 33,073 114 1,398,108 138,944 $ 1,431,181 139,058 Residential mortgage-backed securities 22,586 299 2,261,311 386,392 $ 2,283,897 386,691 Commercial mortgage-backed securities 64,721 507 275,924 11,837 $ 340,645 12,344 Corporate bonds and other — — 104,140 8,361 $ 104,140 8,361 Total $ 122,818 $ 936 $ 4,469,213 $ 558,749 $ 4,592,031 $ 559,685 Less than 12 Months 12 Months or Longer Total March 31, 2023 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 191,725 $ 4,193 $ 292,587 $ 16,289 $ 484,312 $ 20,482 Obligations of states and political subdivisions 126,532 1,448 1,470,950 161,903 1,597,482 163,351 Residential mortgage-backed securities 91,738 2,937 2,489,524 371,224 2,581,262 374,161 Commercial mortgage-backed securities 164,301 3,948 185,635 11,072 349,936 15,020 Corporate bonds and other 42,503 1,167 61,094 7,913 103,597 9,080 Total $ 616,799 $ 13,693 $ 4,499,790 $ 568,401 $ 5,116,589 $ 582,094 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 832 at March 31, 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 March 31, 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 March 31, 2024 and 2023, and December 31, 2023. Unrealized losses on investment securities are expected to recover over time as these securities approach maturity. Our mortgage related securities are backed by GNMA, FNMA and FHLMC or are collateralized by securities backed by these agencies. At March 31, 2024 , 66.95 % of our available-for-sale securities that are obligations of states and political subdivisions were issued within the State of Texas, of which 56.31 % are guaranteed by the Texas Permanent School Fund. Securities, carried at approximately $ 2,516,117,000 on March 31, 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 March 31, 2024, there were no sales of investment securities that were classified as available-for-sale. During the three-months ended March 31, 2023, sales of investment securities that were classified as available-for-sale were $ 145,948,000 . There were no gross realized security gains or losses from sales and calls during the first quarter of 2024. Gross realized security gains from sales and calls during the first quarter of 2023 totaled $ 1,052,000 . Gross realized security losses from sales or calls during the first quarter of 2023 totaled $ 1,040,000 . The specific identification method was used to determ ine cost in order to compute the realized gains and losses.

Loans Held for Investment and A

Loans Held for Investment and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 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 March 31, 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): March 31, December 31, 2024 2023 2023 Commercial: C&I $ 1,191,516 $ 954,686 $ 1,164,811 Municipal 211,013 221,379 214,850 Total Commercial 1,402,529 1,176,065 1,379,661 Agricultural 87,882 77,017 84,890 Real Estate: Construction & Development 921,773 921,190 963,158 Farm 311,002 307,706 344,954 Non-Owner Occupied CRE 853,721 737,117 827,969 Owner Occupied CRE 1,032,845 1,043,018 1,037,281 Residential 1,918,573 1,628,841 1,834,593 Total Real Estate 5,037,914 4,637,872 5,007,955 Consumer: Auto 549,837 537,410 521,859 Non-Auto 151,248 147,851 154,426 Total Consumer 701,085 685,261 676,285 Total Loans 7,229,410 6,576,215 7,148,791 Less: Allowance for credit losses ( 89,562 ) ( 80,818 ) ( 88,734 ) Loans, net $ 7,139,848 $ 6,495,397 $ 7,060,057 Outstanding loan balances at March 31, 2024 and 2023, and December 31, 2023, are net of unearned income, including net deferred loan fees. At March 31, 2024, $ 5,095,506,000 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 March 31, 2024, this available line of credit was $ 1,984,900,000 . At March 31, 2024, there was $ 781,500,000 used on th e 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): March 31, December 31, 2024 2023 2023 Nonaccrual loans $ 36,157 $ 24,171 $ 33,609 Loans still accruing and past due 90 days or more 33 22 1,004 Total nonperforming loans $ 36,190 $ 24,193 $ 34,613 The Company ha d $ 37,204,000 , $ 24,389,000 and $ 35,096,000 in nonaccrual, past due 90 days or more and still accruing, and foreclosed assets at March 31, 2024 and 2023, and December 31, 2023 , respectively. Nonaccrual loans at March 31, 2024 and 2023, and December 31, 2023, consisted of the following (dollars in thousands): March 31, December 31, 2024 2023 2023 Commercial: C&I $ 3,950 $ 5,343 $ 4,132 Municipal — — — Total Commercial 3,950 5,343 4,132 Agricultural 2,043 161 155 Real Estate: Construction & Development 1,976 773 1,444 Farm 4,597 452 4,804 Non-Owner Occupied CRE 9,243 2,907 8,022 Owner Occupied CRE 5,719 6,823 6,822 Residential 7,815 7,232 7,649 Total Real Estate 29,350 18,187 28,741 Consumer: Auto 486 398 464 Non-Auto 328 82 117 Total Consumer 814 480 581 Total $ 36,157 $ 24,171 $ 33,609 No significant additional funds are committed to be advanced in connection with nonaccrual loans as of March 31, 2024. Summary information on the allowance for credit losses for the three-months ended March 31, 2024 and 2023, are outlined by portfolio segment in the following tables (dollars in thousands): Three-Months Ended March 31, 2024 C&I Municipal Agricultural Construction Farm Beginning balance $ 15,698 $ 195 $ 1,281 $ 28,553 $ 2,914 Provision for loan losses 501 — 2,017 ( 3,709 ) ( 397 ) Recoveries 111 — 5 — — Charge-offs ( 204 ) — ( 60 ) ( 33 ) — Ending balance $ 16,106 $ 195 $ 3,243 $ 24,811 $ 2,517 Three-Months Ended March 31, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 13,425 $ 13,813 $ 11,654 $ 810 $ 391 $ 88,734 Provision for loan losses 1,536 ( 1,099 ) 1,813 384 210 1,256 Recoveries 7 42 98 112 47 422 Charge-offs — — — ( 399 ) ( 154 ) ( 850 ) Ending balance $ 14,968 $ 12,756 $ 13,565 $ 907 $ 494 $ 89,562 Three-Months Ended March 31, 2023 C&I Municipal Agricultural Construction Farm Beginning balance $ 16,129 $ 1,026 $ 1,041 $ 26,443 $ 1,957 Provision for loan losses ( 64 ) 41 ( 28 ) 2,084 ( 20 ) Recoveries 52 — 201 100 — Charge-offs ( 34 ) — — — — Ending balance $ 16,083 $ 1,067 $ 1,214 $ 28,627 $ 1,937 Three-Months Ended March 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 9,075 $ 9,928 $ 9,075 $ 845 $ 315 $ 75,834 Provision for loan losses ( 49 ) 2,013 624 70 36 4,707 Recoveries 25 7 3 132 45 565 Charge-offs — — — ( 190 ) ( 64 ) ( 288 ) Ending balance $ 9,051 $ 11,948 $ 9,702 $ 857 $ 332 $ 80,818 Additionally, the Company records a reserve for unfunded commitments in other liabilities, which totaled $ 7,455,000 , $ 10,397,000 and $ 7,903,000 at March 31, 2024 and 2023, and December 31, 2023, respectively. The provision for loan losses of $ 1,256,000 for the three-months ended March 31, 2024 is combined with the reversal of the provision for unfunded commitments of $ 448,000 and reported in the net aggregate of $ 808,000 under the provision for credit losses in the consolidated statement of earnings for the three-months ended March 31, 2024. The $ 4,707,000 provision for loan losses for the three-months ended March 31, 2023 above is combined with the reversal of provision for unfunded commitments of $ 1,926,000 and reported in the aggregate of $ 2,781,000 under the provision for credit losses for the three-months ended March 31, 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 March 31, 2024 and 2023, and December 31, 2023, are summarized in the following tables by loan segment (dollars in thousands): March 31, 2024 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 756 $ 3,194 $ 37,504 $ 41,454 $ 1,541 $ 4,170 $ 5,711 Municipal — — 559 559 — — — Total Commercial 756 3,194 38,063 42,013 1,541 4,170 5,711 Agricultural 713 1,330 4,044 6,087 849 1,881 2,730 Real Estate: Construction & Development 903 1,073 28,953 30,929 189 2,054 2,243 Farm — 4,597 1,936 6,533 727 31 758 Non-Owner Occupied CRE 1,850 7,393 22,412 31,655 1,235 1,772 3,007 Owner Occupied CRE 2,827 2,892 35,460 41,179 445 1,793 2,238 Residential 4,404 3,411 31,456 39,271 242 2,014 2,256 Total Real Estate 9,984 19,366 120,217 149,567 2,838 7,664 10,502 Consumer: Auto — 486 2,342 2,828 1 4 5 Non-Auto — 328 764 1,092 72 57 129 Total Consumer — 814 3,106 3,920 73 61 134 Total $ 11,453 $ 24,704 $ 165,430 $ 201,587 $ 5,301 $ 13,776 $ 19,077 March 31, 2023 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ — $ 5,343 $ 20,141 $ 25,484 $ 3,582 $ 3,941 $ 7,523 Municipal — — 907 907 — — — Total Commercial — 5,343 21,048 26,391 3,582 3,941 7,523 Agricultural — 161 912 1,073 86 485 571 Real Estate: Construction & Development 397 376 18,813 19,586 57 2,340 2,397 Farm 452 — 1,232 1,684 — — — Non-Owner Occupied CRE 2,136 771 28,557 31,464 152 1,929 2,081 Owner Occupied CRE 4,111 2,712 31,978 38,801 297 2,308 2,605 Residential 4,771 2,461 28,463 35,695 259 1,404 1,663 Total Real Estate 11,867 6,320 109,043 127,230 765 7,981 8,746 Consumer: Auto — 398 1,250 1,648 1 2 3 Non-Auto — 82 632 714 — 2 2 Total Consumer — 480 1,882 2,362 1 4 5 Total $ 11,867 $ 12,304 $ 132,885 $ 157,056 $ 4,434 $ 12,411 $ 16,845 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 March 31, 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. March 31, 2024 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 5,711 $ — $ 2,730 $ 2,243 $ 758 Loans collectively evaluated for credit losses 10,395 195 513 22,568 1,759 Total $ 16,106 $ 195 $ 3,243 $ 24,811 $ 2,517 March 31, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,007 $ 2,238 $ 2,256 $ 5 $ 129 $ 19,077 Loans collectively evaluated for credit losses 11,961 10,518 11,309 902 365 70,485 Total $ 14,968 $ 12,756 $ 13,565 $ 907 $ 494 $ 89,562 March 31, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 7,523 $ — $ 571 $ 2,397 $ — Loans collectively evaluated for credit losses 8,560 1,067 643 26,230 1,937 Total $ 16,083 $ 1,067 $ 1,214 $ 28,627 $ 1,937 March 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 2,081 $ 2,605 $ 1,663 $ 3 $ 2 $ 16,845 Loans collectively evaluated for credit losses 6,970 9,343 8,039 854 330 63,973 Total $ 9,051 $ 11,948 $ 9,702 $ 857 $ 332 $ 80,818 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 March 31, 2024 and 2023, and December 31, 2023, related to the balance in the allowance for credit losses follows below (dollars in thousands): March 31, 2024 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 41,454 $ 559 $ 6,087 $ 30,929 $ 6,533 Loans collectively evaluated for credit losses 1,150,062 210,454 81,795 890,844 304,469 Total $ 1,191,516 $ 211,013 $ 87,882 $ 921,773 $ 311,002 March 31, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 31,655 $ 41,179 $ 39,271 $ 2,828 $ 1,092 $ 201,587 Loans collectively evaluated for credit losses 822,066 991,666 1,879,302 547,009 150,156 7,027,823 Total $ 853,721 $ 1,032,845 $ 1,918,573 $ 549,837 $ 151,248 $ 7,229,410 March 31, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 25,484 $ 907 $ 1,073 $ 19,586 $ 1,684 Loans collectively evaluated for credit losses 929,202 220,472 75,944 901,604 306,022 Total $ 954,686 $ 221,379 $ 77,017 $ 921,190 $ 307,706 March 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 31,464 $ 38,801 $ 35,695 $ 1,648 $ 714 $ 157,056 Loans collectively evaluated for credit losses 705,653 1,004,217 1,593,146 535,762 147,137 6,419,159 Total $ 737,117 $ 1,043,018 $ 1,628,841 $ 537,410 $ 147,851 $ 6,576,215 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 March 31, 2024 (dollars in millions): March 31, 2024 2023 2022 2021 2020 Prior Revolving Total C&I Risk rating: Pass $ 236 $ 551 $ 226 $ 70 $ 32 $ 36 $ — $ 1,151 Special mention 6 17 1 — — — — 24 Substandard 2 10 1 1 2 1 — 17 Doubtful — — — — — — — — Total $ 244 $ 578 $ 228 $ 71 $ 34 $ 37 $ — $ 1,192 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Municipal Risk rating: Pass $ 5 $ 20 $ 81 $ 15 $ 10 $ 79 $ — $ 210 Special mention — — — — — — — — Substandard — — — 1 — — — 1 Doubtful — — — — — — — — Total $ 5 $ 20 $ 81 $ 16 $ 10 $ 79 $ — $ 211 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Agricultural Risk rating: Pass $ 18 $ 54 $ 6 $ 3 $ 1 $ — $ — $ 82 Special mention — 1 — — — — — 1 Substandard 3 1 — — — 1 — 5 Doubtful — — — — — — — — Total $ 21 $ 56 $ 6 $ 3 $ 1 $ 1 $ — $ 88 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Construction & Development Risk rating: Pass $ 117 $ 438 $ 240 $ 63 $ 19 $ 14 $ — $ 891 Special mention 7 6 3 — — — — 16 Substandard 1 7 1 6 — — — 15 Doubtful — — — — — — — — Total $ 125 $ 451 $ 244 $ 69 $ 19 $ 14 $ — $ 922 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Farm Risk rating: Pass $ 23 $ 58 $ 101 $ 71 $ 23 $ 29 $ — $ 305 Special mention — 1 — — — — — 1 Substandard — 1 — — 4 — — 5 Doubtful — — — — — — — — Total $ 23 $ 60 $ 101 $ 71 $ 27 $ 29 $ — $ 311 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 59 $ 133 $ 244 $ 174 $ 104 $ 108 $ — $ 822 Special mention — — — 1 1 1 — 3 Substandard — 2 1 3 7 16 — 29 Doubtful — — — — — — — — Total $ 59 $ 135 $ 245 $ 178 $ 112 $ 125 $ — $ 854 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 28 $ 155 $ 305 $ 202 $ 110 $ 190 $ — $ 990 Special mention — 2 1 8 — — — 11 Substandard — 2 6 5 1 18 — 32 Doubtful — — — — — — — — Total $ 28 $ 159 $ 312 $ 215 $ 111 $ 208 $ — $ 1,033 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Residential Risk rating: Pass $ 130 $ 450 $ 424 $ 302 $ 151 $ 281 $ 141 $ 1,879 Special mention — 1 1 1 1 2 1 7 Substandard 2 7 4 4 2 10 3 32 Doubtful — — — — — — — — Total $ 132 $ 458 $ 429 $ 307 $ 154 $ 293 $ 145 $ 1,918 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Auto Risk rating: Pass $ 91 $ 175 $ 188 $ 64 $ 22 $ 8 $ — $ 548 Special mention — — — — — — — — Substandard — — 1 1 — — — 2 Doubtful — — — — — — — — Total $ 91 $ 175 $ 189 $ 65 $ 22 $ 8 $ — $ 550 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Non-Auto Risk rating: Pass $ 18 $ 59 $ 41 $ 20 $ 3 $ 2 $ 7 $ 150 Special mention — — — — — — — — Substandard — 1 — — — — — 1 Doubtful — — — — — — — — Total $ 18 $ 60 $ 41 $ 20 $ 3 $ 2 $ 7 $ 151 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Total Loans Risk rating: Pass $ 725 $ 2,093 $ 1,856 $ 984 $ 475 $ 747 $ 148 $ 7,028 Special mention 13 28 6 10 2 3 1 63 Substandard 8 31 14 21 16 46 3 139 Doubtful — — — — — — — — Total $ 746 $ 2,152 $ 1,876 $ 1,015 $ 493 $ 796 $ 152 $ 7,230 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at March 31, 2023 (dollars in millions): March 31, 2023 2022 2021 2020 2019 Prior Revolving Total C&I Risk rating: Pass $ 155 $ 548 $ 132 $ 48 $ 19 $ 28 $ — $ 930 Special mention 1 3 1 2 1 — — 8 Substandard 1 6 4 2 1 3 — 17 Doubtful — — — — — — — — Total $ 157 $ 557 $ 137 $ 52 $ 21 $ 31 $ — $ 955 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Municipal Risk rating: Pass $ 3 $ 82 $ 19 $ 15 $ 2 $ 99 $ — $ 220 Special mention — — — — 1 — — 1 Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 3 $ 82 $ 19 $ 15 $ 3 $ 99 $ — $ 221 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Agricultural Risk rating: Pass $ 16 $ 51 $ 5 $ 2 $ 1 $ 1 $ — $ 76 Special mention — 1 — — — — — 1 Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 16 $ 52 $ 5 $ 2 $ 1 $ 1 $ — $ 77 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Construction & Development Risk rating: Pass $ 111 $ 586 $ 124 $ 56 $ 12 $ 13 $ — $ 902 Special mention 3 9 — — — — — 12 Substandard 2 4 1 — — — — 7 Doubtful — — — — — — — — Total $ 116 $ 599 $ 125 $ 56 $ 12 $ 13 $ — $ 921 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Farm Risk rating: Pass $ 12 $ 142 $ 82 $ 31 $ 11 $ 28 $ — $ 306 Special mention — — — — — — — — Substandard — 2 — — — — — 2 Doubtful — — — — — — — — Total $ 12 $ 144 $ 82 $ 31 $ 11 $ 28 $ — $ 308 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 36 $ 244 $ 192 $ 96 $ 47 $ 91 $ — $ 706 Special mention — — 1 — 11 6 — 18 Substandard — 2 2 1 2 6 — 13 Doubtful — — — — — — — — Total $ 36 $ 246 $ 195 $ 97 $ 60 $ 103 $ — $ 737 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 73 $ 316 $ 247 $ 124 $ 74 $ 170 $ — $ 1,004 Special mention — 3 1 2 6 1 — 13 Substandard 1 3 2 1 3 16 — 26 Doubtful — — — — — — — — Total $ 74 $ 322 $ 250 $ 127 $ 83 $ 187 $ — $ 1,043 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Residential Risk rating: Pass $ 95 $ 479 $ 355 $ 181 $ 78 $ 268 $ 137 $ 1,593 Special mention — 1 3 2 — 4 1 11 Substandard 1 5 2 3 2 9 3 25 Doubtful — — — — — — — — Total $ 96 $ 485 $ 360 $ 186 $ 80 $ 281 $ 141 $ 1,629 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Auto Risk rating: Pass $ 51 $ 296 $ 116 $ 46 $ 20 $ 6 $ — $ 535 Special mention — — — — — — — — Substandard — 1 — 1 — — — 2 Doubtful — — — — — — — — Total $ 51 $ 297 $ 116 $ 47 $ 20 $ 6 $ — $ 537 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Auto Risk rating: Pass $ 21 $ 74 $ 34 $ 7 $ 2 $ 2 $ 7 $ 147 Special mention — — — — — — — — Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 21 $ 74 $ 35 $ 7 $ 2 $ 2 $ 7 $ 148 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Total Loans Risk rating: Pass $ 573 $ 2,818 $ 1,306 $ 606 $ 266 $ 706 $ 144 $ 6,419 Special mention 4 17 6 6 19 11 1 64 Substandard 5 23 12 8 8 34 3 93 Doubtful — — — — — — — — Total $ 582 $ 2,858 $ 1,324 $ 620 $ 293 $ 751 $ 148 $ 6,576 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — 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 March 31, 2024 and 2023, and December 31, 2023, the Company’s past due loans are as follows (dollars in thousands): March 31, 2024 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 6,462 $ 250 $ 1,594 $ 8,306 $ 1,183,210 $ 1,191,516 $ 33 Municipal 25 — — 25 210,988 211,013 — Total Commercial 6,487 250 1,594 8,331 1,394,198 1,402,529 33 Agricultural 624 — 71 695 87,187 87,882 — Real Estate: Construction & Development 9,277 258 1,347 10,882 910,891 921,773 — Farm 855 7 95 957 310,045 311,002 — Non-Owner Occupied CRE 1,840 19 1,374 3,233 850,488 853,721 — Owner Occupied CRE 3,269 — 70 3,339 1,029,506 1,032,845 — Residential 13,804 414 2,540 16,758 1,901,815 1,918,573 — Total Real Estate 29,045 698 5,426 35,169 5,002,745 5,037,914 — Consumer: Auto 967 120 — 1,087 548,750 549,837 — Non-Auto 219 13 — 232 151,016 151,248 — Total Consumer 1,186 133 — 1,319 699,766 701,085 — Total $ 37,342 $ 1,081 $ 7,091 $ 45,514 $ 7,183,896 $ 7,229,410 $ 33 March 31, 2023 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 3,952 $ 292 $ 1,825 $ 6,069 $ 948,617 $ 954,686 $ 14 Municipal 209 — — 209 221,170 221,379 — Total Commercial 4,161 292 1,825 6,278 1,169,787 1,176,065 14 Agricultural 816 25 24 865 76,152 77,017 — Real Estate: Construction & Development 7,058 332 — 7,390 913,800 921,190 — Farm 264 — 372 636 307,070 307,706 — Non-Owner Occupied CRE 3,183 — 695 3,878 733,239 737,117 — Owner Occupied CRE 3,886 — — 3,886 1,039,132 1,043,018 — Residential 7,484 744 767 8,995 1,619,846 1,628,841 — Total Real Estate 21,875 1,076 1,834 24,785 4,613,087 4,637,872 — Consumer: Auto 683 41 9 733 536,677 537,410 8 Non-Auto 136 — — 136 147,715 147,851 — Total Consumer 819 41 9 869 684,392 685,261 8 Total $ 27,671 $ 1,434 $ 3,692 $ 32,797 $ 6,543,418 $ 6,576,215 $ 22 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 three-months ended March 31, 2024 and 2023 , respectively, loan modifications made to borrowers experiencing financial difficulty was insignificant.

Loans Held for Sale

Loans Held for Sale	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Loans Held for Sale	Note 4 - L oans Held-for-Sale Loans held-for-sale totaled $ 16,109,000 , $ 11,996,000 and $ 14,253,000 at March 31, 2024 and 2023, and December 31, 2023, respectively. At March 31, 2024 and 2023, and December 31, 2023, $ 1,029,000 , $ 230,000 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	3 Months Ended
	Mar. 31, 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): March 31, 2024: Outstanding Asset Liability IRLCs $ 53,206 $ 803 $ — Forward mortgage-backed securities trades 70,000 — 91 March 31, 2023: Outstanding Asset Liability IRLCs $ 58,706 $ 827 $ — Forward mortgage-backed securities trades 69,500 — 334 December 31, 2023: Outstanding Asset Liability IRLCs $ 28,956 $ 427 $ — Forward mortgage-backed securities trades 35,000 — 288

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Borrowings	Note 6 – Borrowings Borrowings consisted of the following (dollars in thousands): March 31, December 31, 2024 2023 2023 Securities sold under agreements with customers to repurchase $ 307,297 $ 608,299 $ 381,928 Federal funds purchased 5,750 3,575 1,100 Other borrowings 21,053 21,053 21,053 Total $ 334,100 $ 632,927 $ 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 March 31, 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	3 Months Ended
	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Note 7 - Income Taxes Income tax expense was $ 11,480,000 for the first quarter of 2024 as compared to $ 11,688,000 for the same period in 2023. The Company’s effective tax rates on pretax income were 17.70 % and 18.19 % for the first quarters 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 $ 978,000 at March 31, 2024, and $ 131,000 at March 31, 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 sever 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 March 31, 2024, March 31, 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 March 31, 2024 and 2023, and December 31, 2023, the consolidated balance sheet of the Company included CDE investments in other assets of $ 25,411,000 , $ 26,553,000 , and $ 25,738,000 , respectively.

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 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 March 31, 2024, the Company had 1,617,290 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 three-months ended March 31, 2024 and 2023. For the Three-Months Ended March 31, 2024 2023 Restricted Weighted Restricted Weighted Balance at beginning of period 53,817 $ 37.04 39,657 $ 47.83 Grants — — — — Vesting — — — — Forfeited/expired ( 599 ) 33.89 ( 2,888 ) 47.87 Balance at end of period 53,218 $ 37.07 36,769 $ 47.83 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 50 % each on average adjusted earnings per share growth and 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 three-months ended March 31, 2024 and 2023. For the Three-Months Ended March 31, 2024 2023 Performance-Based Restricted Weighted Performance-Based Restricted Weighted Balance at beginning of period 75,227 $ 40.24 47,082 $ 48.00 Grants — — — — Vesting ( 20,532 ) 48.91 — — Forfeited/expired ( 686 ) 35.61 ( 3,456 ) 48.04 Balance at end of period 54,009 $ 37.00 43,626 $ 48.00 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 Three-Months Ended March 31, 2024 2023 Restricted Weighted Restricted Weighted Balance at beginning of period 25,190 $ 27.79 24,813 $ 36.21 Grants — — — — Vesting — — ( 2,872 ) 28.25 Forfeited/expired — — ( 1,105 ) 29.70 Balance at end of period 25,190 $ 27.79 20,836 $ 37.53 The total fair value of restricted stock vested for the three-months ended March 31, 2024 and 2023, wa s $ 650,000 and $ 98,000 , respectively. The Company recorded restricted stock unit, performance-based restricted stock unit and restricted stock award expense for employees of $ 469,000 and $ 358,000 for the three-months ended March 31, 2024 and 2023, respectively. The Company recorded director expense related to these restricted stock grants of $ 175,000 and $ 150,000 , for the three-months ended March 31, 2024 and 2023, respectively. As of March 31, 2024 and 2023, there were $ 2,514,000 and $ 2,576,000 , respectively, of total unrecognized compensation cost related to un vested restricted stock, restricted stock units and performance-based restricted stock units which is expected to be recognized over a weighted-average period of 1.14 years and 1.17 years, respectively. At March 31, 2024 and 2023, and December 31, 2023, there was $ 111,000 , $ 82,000 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 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 three-months ended March 31, 2024 is presented in the table and narrative below:​​​​​​​ Shares Weighted- Outstanding, December 31, 2023 1,552,249 $ 30.45 Granted — — Exercised ( 82,614 ) 20.77 Cancelled ( 21,692 ) 36.49 Outstanding, March 31, 2024 1,447,943 30.91 Exercisable, March 31, 2024 813,657 $ 25.85 The options outstanding at March 31, 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 $ 485,000 and $ 444,000 for the three-months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, there was $ 4,723,000 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 1.44 years. The total fair value of shares vested during the three-months ended March 31, 2024 and 2023 was $ 46,000 and $ 15,000 , respectively.

Fair Value Disclosures

Fair Value Disclosures	3 Months Ended
	Mar. 31, 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-months ended March 31, 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): March 31, 2024 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 432,168 $ — $ — $ 432,168 Obligations of state and political subdivisions — 1,454,035 — 1,454,035 Corporate bonds — 99,717 — 99,717 Residential mortgage-backed securities — 2,299,277 — 2,299,277 Commercial mortgage-backed securities — 368,906 — 368,906 Other securities 4,423 — — 4,423 Total $ 436,591 $ 4,221,935 $ — $ 4,658,526 Loans held-for-sale $ — $ 15,080 $ — $ 15,080 IRLCs $ — $ — $ 803 $ 803 Forward mortgage-backed securities trades $ — $ ( 91 ) $ — $ ( 91 ) March 31, 2023 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 488,242 $ — $ — $ 488,242 Obligations of states and political subdivisions — 1,773,612 — 1,773,612 Corporate bonds — 99,620 — 99,620 Residential mortgage-backed securities — 2,583,170 — 2,583,170 Commercial mortgage-backed securities — 349,936 — 349,936 Other securities 3,977 — — 3,977 Total $ 492,219 $ 4,806,338 $ — $ 5,298,557 Loans held-for-sale $ — $ 11,766 $ — $ 11,766 IRLCs $ — $ — $ 827 $ 827 Forward mortgage-backed securities trades $ — $ ( 334 ) $ — $ ( 334 ) 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): March 31, December 31, 2024 2023 2023 Unpaid principal balance on loans held-for-sale $ 14,701 $ 11,416 $ 10,757 Net unrealized gains on loans held-for-sale 379 350 320 Loans held-for-sale at fair value $ 15,080 $ 11,766 $ 11,077 The following table summarizes the Company’s gains on sale and fees of mortgage loans for the three-months ended March 31, 2024 and 2023 (dollars in thousand): Three-Months Ended 2024 2023 Realized gain on sale and fees on mortgage loans* $ 2,580 $ 2,859 Change in fair value on loans held-for-sale and IRLCs 351 534 Change in forward mortgage-backed securities trades 197 ( 419 ) Total gain on sale of mortgage loans $ 3,128 $ 2,974 * 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 March 31, 2024, March 31, 2023, or December 31, 2023 . No significant credit losses were recognized on mortgage loans held-for-sale for the three-months ended March 31, 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 three-months ended March 31, 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 special 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 other real estate owned properties that were re-measured subsequent to their initial transfer to other real estate owned during the three-months ended March 31, 2024 and 2023. At March 31, 2024 and 2023, and December 31, 2023, other real estate owned totaled $ 937,000 , $ 175,000 , 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). March 31, December 31, 2024 2023 2023 Carrying Value Estimated Carrying Estimated Carrying Estimated Fair Value Cash and due from banks $ 222,464 $ 222,464 $ 224,875 $ 224,875 $ 281,354 $ 281,354 Level 1 Federal funds sold 12,300 12,300 — — — — Level 1 Interest-bearing demand deposits 365,397 365,397 221,336 221,336 255,237 255,237 Level 1 Available-for-sale securities 4,658,526 4,658,526 5,298,557 5,298,557 4,732,762 4,732,762 Levels 1 Loans held-for-investment, net of 7,139,847 7,141,043 6,495,397 6,464,027 7,060,057 7,036,722 Level 3 Loans held-for-sale 16,109 16,109 11,996 12,018 14,253 14,378 Level 2 Accrued interest receivable 56,278 56,278 50,658 50,658 58,544 58,544 Level 2 Deposits with stated maturities 938,541 938,459 739,498 736,434 938,980 938,534 Level 2 Deposits with no stated maturities 10,351,267 10,351,267 10,196,920 10,196,920 10,199,320 10,199,320 Level 1 Repurchase Agreements 307,297 307,297 608,299 608,299 381,928 381,928 Level 2 Borrowings 26,803 26,803 24,628 24,628 22,153 22,153 Level 2 Accrued interest payable 8,362 8,362 3,617 3,617 10,215 10,215 Level 2 IRLCs 803 803 827 827 427 427 Level 3 Forward mortgage-backed securities ( 91 ) ( 91 ) ( 334 ) ( 334 ) ( 288 ) ( 288 ) Level 2

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2024
Subsequent Events [Abstract]
Subsequent Event	Note 10 - Subsequent Events Effective April 22, 2024, First Financial Bank, N.A. and First Financial Trust and Asset Management Company, N.A. converted their charters to a Texas state banking association and a Texas chartered trust company, respectively. The Bank is now a Texas banking association chartered and regulated by the Texas Department of Banking and Trust Company is now a Texas trust company chartered and regulated by the Texas Department of Banking. The Bank will continue to be a member bank of the Federal Reserve system and maintain FDIC deposit insurance.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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 one bank with 79 locations located in Texas as of March 31, 2024 . The Company’s subsidiary bank is First Financial Bank. 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 27, 2021, the Company’s Board of Directors authorized the repurchase of up to 5,000,000 common shares through July 31, 2023. On July 25, 2023, the Company's Board of Directors renewed the prior authorization through July 31, 2024. 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 current authorization, the Company has 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-months ended March 31, 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 March 31, 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 March 31, 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 judgement, 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 March 31, 2024 and 2023, and December 31, 2023, the Company’s reserve for unfunded commitments totaled $ 7,455,000 , $ 10,397,000 and $ 7,903,000 , respectively, which 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 three-months ended March 31, 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 $ 441,227,000 , $ 458,249,000 and $ 403,298,000 at March 31, 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 March 31, 2024, and 2023, and December 31, 2023, deferred tax assets totaled $ 122,844,000 , $ 122,947,000 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 417,000 and 480,000 anti-dilutive shares for the three-months ended March 31, 2024 and 2023 , respectively, 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 March 31, 2024: Net earnings per share, basic $ 53,397 142,724,674 $ 0.37 Effect of stock options and stock grants — 304,775 — Net earnings per share, diluted $ 53,397 143,029,449 $ 0.37 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended March 31, 2023: Net earnings per share, basic $ 52,568 142,665,646 $ 0.37 Effect of stock options and stock grants — 400,365 — Net earnings per share, diluted $ 52,568 143,066,011 $ 0.37

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2024: Net earnings per share, basic $ 53,397 142,724,674 $ 0.37 Effect of stock options and stock grants — 304,775 — Net earnings per share, diluted $ 53,397 143,029,449 $ 0.37 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended March 31, 2023: Net earnings per share, basic $ 52,568 142,665,646 $ 0.37 Effect of stock options and stock grants — 400,365 — Net earnings per share, diluted $ 52,568 143,066,011 $ 0.37

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 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): March 31, 2024 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 445,399 $ — $ ( 13,231 ) $ 432,168 Obligations of states and political subdivisions 1,592,523 570 ( 139,058 ) 1,454,035 Residential mortgage-backed securities 2,685,896 72 ( 386,691 ) 2,299,277 Commercial mortgage-backed securities 381,198 52 ( 12,344 ) 368,906 Corporate bonds and other 112,501 — ( 8,361 ) 104,140 Total securities available-for-sale $ 5,217,517 $ 694 $ ( 559,685 ) $ 4,658,526 March 31, 2023 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 508,692 $ 32 $ ( 20,482 ) $ 488,242 Obligations of states and political subdivisions 1,935,401 1,562 ( 163,351 ) 1,773,612 Residential mortgage-backed securities 2,957,314 17 ( 374,161 ) 2,583,170 Commercial mortgage-backed securities 364,956 — ( 15,020 ) 349,936 Corporate bonds and other 112,677 — ( 9,080 ) 103,597 Total securities available-for-sale $ 5,879,040 $ 1,611 $ ( 582,094 ) $ 5,298,557 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
Amortized Cost and Estimated Fair Value of Available-for-Sale Securities	The amortized cost and estimated fair value of available-for-sale securities at March 31, 2024, by contractual and expected maturity, are shown below (dollars in thousands): Amortized Estimated Cost Basis Fair Value Due within one year $ 343,112 $ 337,823 Due after one year through five years 1,374,546 1,288,485 Due after five years through ten years 2,421,721 2,126,343 Due after ten years 1,078,138 905,875 Total $ 5,217,517 $ 4,658,526
Continuous Unrealized-Loss Position of Available-for-Sale Securities	The following tables disclose as of March 31, 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 March 31, 2024 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 2,438 $ 16 $ 429,730 $ 13,215 $ 432,168 $ 13,231 Obligations of states and political subdivisions 33,073 114 1,398,108 138,944 $ 1,431,181 139,058 Residential mortgage-backed securities 22,586 299 2,261,311 386,392 $ 2,283,897 386,691 Commercial mortgage-backed securities 64,721 507 275,924 11,837 $ 340,645 12,344 Corporate bonds and other — — 104,140 8,361 $ 104,140 8,361 Total $ 122,818 $ 936 $ 4,469,213 $ 558,749 $ 4,592,031 $ 559,685 Less than 12 Months 12 Months or Longer Total March 31, 2023 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 191,725 $ 4,193 $ 292,587 $ 16,289 $ 484,312 $ 20,482 Obligations of states and political subdivisions 126,532 1,448 1,470,950 161,903 1,597,482 163,351 Residential mortgage-backed securities 91,738 2,937 2,489,524 371,224 2,581,262 374,161 Commercial mortgage-backed securities 164,301 3,948 185,635 11,072 349,936 15,020 Corporate bonds and other 42,503 1,167 61,094 7,913 103,597 9,080 Total $ 616,799 $ 13,693 $ 4,499,790 $ 568,401 $ 5,116,589 $ 582,094 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_2

Loans Held for Investment and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Loans Held-for-Investment by Portfolio Segment	Loans held-for-investment by portfolio segment are as follows (dollars in thousands): March 31, December 31, 2024 2023 2023 Commercial: C&I $ 1,191,516 $ 954,686 $ 1,164,811 Municipal 211,013 221,379 214,850 Total Commercial 1,402,529 1,176,065 1,379,661 Agricultural 87,882 77,017 84,890 Real Estate: Construction & Development 921,773 921,190 963,158 Farm 311,002 307,706 344,954 Non-Owner Occupied CRE 853,721 737,117 827,969 Owner Occupied CRE 1,032,845 1,043,018 1,037,281 Residential 1,918,573 1,628,841 1,834,593 Total Real Estate 5,037,914 4,637,872 5,007,955 Consumer: Auto 549,837 537,410 521,859 Non-Auto 151,248 147,851 154,426 Total Consumer 701,085 685,261 676,285 Total Loans 7,229,410 6,576,215 7,148,791 Less: Allowance for credit losses ( 89,562 ) ( 80,818 ) ( 88,734 ) Loans, net $ 7,139,848 $ 6,495,397 $ 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): March 31, December 31, 2024 2023 2023 Nonaccrual loans $ 36,157 $ 24,171 $ 33,609 Loans still accruing and past due 90 days or more 33 22 1,004 Total nonperforming loans $ 36,190 $ 24,193 $ 34,613
Schedule of Non-Accrual Loans	Nonaccrual loans at March 31, 2024 and 2023, and December 31, 2023, consisted of the following (dollars in thousands): March 31, December 31, 2024 2023 2023 Commercial: C&I $ 3,950 $ 5,343 $ 4,132 Municipal — — — Total Commercial 3,950 5,343 4,132 Agricultural 2,043 161 155 Real Estate: Construction & Development 1,976 773 1,444 Farm 4,597 452 4,804 Non-Owner Occupied CRE 9,243 2,907 8,022 Owner Occupied CRE 5,719 6,823 6,822 Residential 7,815 7,232 7,649 Total Real Estate 29,350 18,187 28,741 Consumer: Auto 486 398 464 Non-Auto 328 82 117 Total Consumer 814 480 581 Total $ 36,157 $ 24,171 $ 33,609
Changes in Allowance for Loan Losses	Summary information on the allowance for credit losses for the three-months ended March 31, 2024 and 2023, are outlined by portfolio segment in the following tables (dollars in thousands): Three-Months Ended March 31, 2024 C&I Municipal Agricultural Construction Farm Beginning balance $ 15,698 $ 195 $ 1,281 $ 28,553 $ 2,914 Provision for loan losses 501 — 2,017 ( 3,709 ) ( 397 ) Recoveries 111 — 5 — — Charge-offs ( 204 ) — ( 60 ) ( 33 ) — Ending balance $ 16,106 $ 195 $ 3,243 $ 24,811 $ 2,517 Three-Months Ended March 31, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 13,425 $ 13,813 $ 11,654 $ 810 $ 391 $ 88,734 Provision for loan losses 1,536 ( 1,099 ) 1,813 384 210 1,256 Recoveries 7 42 98 112 47 422 Charge-offs — — — ( 399 ) ( 154 ) ( 850 ) Ending balance $ 14,968 $ 12,756 $ 13,565 $ 907 $ 494 $ 89,562 Three-Months Ended March 31, 2023 C&I Municipal Agricultural Construction Farm Beginning balance $ 16,129 $ 1,026 $ 1,041 $ 26,443 $ 1,957 Provision for loan losses ( 64 ) 41 ( 28 ) 2,084 ( 20 ) Recoveries 52 — 201 100 — Charge-offs ( 34 ) — — — — Ending balance $ 16,083 $ 1,067 $ 1,214 $ 28,627 $ 1,937 Three-Months Ended March 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 9,075 $ 9,928 $ 9,075 $ 845 $ 315 $ 75,834 Provision for loan losses ( 49 ) 2,013 624 70 36 4,707 Recoveries 25 7 3 132 45 565 Charge-offs — — — ( 190 ) ( 64 ) ( 288 ) Ending balance $ 9,051 $ 11,948 $ 9,702 $ 857 $ 332 $ 80,818
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 March 31, 2024 and 2023, and December 31, 2023, are summarized in the following tables by loan segment (dollars in thousands): March 31, 2024 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 756 $ 3,194 $ 37,504 $ 41,454 $ 1,541 $ 4,170 $ 5,711 Municipal — — 559 559 — — — Total Commercial 756 3,194 38,063 42,013 1,541 4,170 5,711 Agricultural 713 1,330 4,044 6,087 849 1,881 2,730 Real Estate: Construction & Development 903 1,073 28,953 30,929 189 2,054 2,243 Farm — 4,597 1,936 6,533 727 31 758 Non-Owner Occupied CRE 1,850 7,393 22,412 31,655 1,235 1,772 3,007 Owner Occupied CRE 2,827 2,892 35,460 41,179 445 1,793 2,238 Residential 4,404 3,411 31,456 39,271 242 2,014 2,256 Total Real Estate 9,984 19,366 120,217 149,567 2,838 7,664 10,502 Consumer: Auto — 486 2,342 2,828 1 4 5 Non-Auto — 328 764 1,092 72 57 129 Total Consumer — 814 3,106 3,920 73 61 134 Total $ 11,453 $ 24,704 $ 165,430 $ 201,587 $ 5,301 $ 13,776 $ 19,077 March 31, 2023 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ — $ 5,343 $ 20,141 $ 25,484 $ 3,582 $ 3,941 $ 7,523 Municipal — — 907 907 — — — Total Commercial — 5,343 21,048 26,391 3,582 3,941 7,523 Agricultural — 161 912 1,073 86 485 571 Real Estate: Construction & Development 397 376 18,813 19,586 57 2,340 2,397 Farm 452 — 1,232 1,684 — — — Non-Owner Occupied CRE 2,136 771 28,557 31,464 152 1,929 2,081 Owner Occupied CRE 4,111 2,712 31,978 38,801 297 2,308 2,605 Residential 4,771 2,461 28,463 35,695 259 1,404 1,663 Total Real Estate 11,867 6,320 109,043 127,230 765 7,981 8,746 Consumer: Auto — 398 1,250 1,648 1 2 3 Non-Auto — 82 632 714 — 2 2 Total Consumer — 480 1,882 2,362 1 4 5 Total $ 11,867 $ 12,304 $ 132,885 $ 157,056 $ 4,434 $ 12,411 $ 16,845 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 March 31, 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. March 31, 2024 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 5,711 $ — $ 2,730 $ 2,243 $ 758 Loans collectively evaluated for credit losses 10,395 195 513 22,568 1,759 Total $ 16,106 $ 195 $ 3,243 $ 24,811 $ 2,517 March 31, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,007 $ 2,238 $ 2,256 $ 5 $ 129 $ 19,077 Loans collectively evaluated for credit losses 11,961 10,518 11,309 902 365 70,485 Total $ 14,968 $ 12,756 $ 13,565 $ 907 $ 494 $ 89,562 March 31, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 7,523 $ — $ 571 $ 2,397 $ — Loans collectively evaluated for credit losses 8,560 1,067 643 26,230 1,937 Total $ 16,083 $ 1,067 $ 1,214 $ 28,627 $ 1,937 March 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 2,081 $ 2,605 $ 1,663 $ 3 $ 2 $ 16,845 Loans collectively evaluated for credit losses 6,970 9,343 8,039 854 330 63,973 Total $ 9,051 $ 11,948 $ 9,702 $ 857 $ 332 $ 80,818 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 March 31, 2024 and 2023, and December 31, 2023, related to the balance in the allowance for credit losses follows below (dollars in thousands): March 31, 2024 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 41,454 $ 559 $ 6,087 $ 30,929 $ 6,533 Loans collectively evaluated for credit losses 1,150,062 210,454 81,795 890,844 304,469 Total $ 1,191,516 $ 211,013 $ 87,882 $ 921,773 $ 311,002 March 31, 2024 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 31,655 $ 41,179 $ 39,271 $ 2,828 $ 1,092 $ 201,587 Loans collectively evaluated for credit losses 822,066 991,666 1,879,302 547,009 150,156 7,027,823 Total $ 853,721 $ 1,032,845 $ 1,918,573 $ 549,837 $ 151,248 $ 7,229,410 March 31, 2023 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 25,484 $ 907 $ 1,073 $ 19,586 $ 1,684 Loans collectively evaluated for credit losses 929,202 220,472 75,944 901,604 306,022 Total $ 954,686 $ 221,379 $ 77,017 $ 921,190 $ 307,706 March 31, 2023 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 31,464 $ 38,801 $ 35,695 $ 1,648 $ 714 $ 157,056 Loans collectively evaluated for credit losses 705,653 1,004,217 1,593,146 535,762 147,137 6,419,159 Total $ 737,117 $ 1,043,018 $ 1,628,841 $ 537,410 $ 147,851 $ 6,576,215 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 March 31, 2024 (dollars in millions): March 31, 2024 2023 2022 2021 2020 Prior Revolving Total C&I Risk rating: Pass $ 236 $ 551 $ 226 $ 70 $ 32 $ 36 $ — $ 1,151 Special mention 6 17 1 — — — — 24 Substandard 2 10 1 1 2 1 — 17 Doubtful — — — — — — — — Total $ 244 $ 578 $ 228 $ 71 $ 34 $ 37 $ — $ 1,192 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Municipal Risk rating: Pass $ 5 $ 20 $ 81 $ 15 $ 10 $ 79 $ — $ 210 Special mention — — — — — — — — Substandard — — — 1 — — — 1 Doubtful — — — — — — — — Total $ 5 $ 20 $ 81 $ 16 $ 10 $ 79 $ — $ 211 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Agricultural Risk rating: Pass $ 18 $ 54 $ 6 $ 3 $ 1 $ — $ — $ 82 Special mention — 1 — — — — — 1 Substandard 3 1 — — — 1 — 5 Doubtful — — — — — — — — Total $ 21 $ 56 $ 6 $ 3 $ 1 $ 1 $ — $ 88 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Construction & Development Risk rating: Pass $ 117 $ 438 $ 240 $ 63 $ 19 $ 14 $ — $ 891 Special mention 7 6 3 — — — — 16 Substandard 1 7 1 6 — — — 15 Doubtful — — — — — — — — Total $ 125 $ 451 $ 244 $ 69 $ 19 $ 14 $ — $ 922 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Farm Risk rating: Pass $ 23 $ 58 $ 101 $ 71 $ 23 $ 29 $ — $ 305 Special mention — 1 — — — — — 1 Substandard — 1 — — 4 — — 5 Doubtful — — — — — — — — Total $ 23 $ 60 $ 101 $ 71 $ 27 $ 29 $ — $ 311 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 59 $ 133 $ 244 $ 174 $ 104 $ 108 $ — $ 822 Special mention — — — 1 1 1 — 3 Substandard — 2 1 3 7 16 — 29 Doubtful — — — — — — — — Total $ 59 $ 135 $ 245 $ 178 $ 112 $ 125 $ — $ 854 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 28 $ 155 $ 305 $ 202 $ 110 $ 190 $ — $ 990 Special mention — 2 1 8 — — — 11 Substandard — 2 6 5 1 18 — 32 Doubtful — — — — — — — — Total $ 28 $ 159 $ 312 $ 215 $ 111 $ 208 $ — $ 1,033 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Residential Risk rating: Pass $ 130 $ 450 $ 424 $ 302 $ 151 $ 281 $ 141 $ 1,879 Special mention — 1 1 1 1 2 1 7 Substandard 2 7 4 4 2 10 3 32 Doubtful — — — — — — — — Total $ 132 $ 458 $ 429 $ 307 $ 154 $ 293 $ 145 $ 1,918 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Auto Risk rating: Pass $ 91 $ 175 $ 188 $ 64 $ 22 $ 8 $ — $ 548 Special mention — — — — — — — — Substandard — — 1 1 — — — 2 Doubtful — — — — — — — — Total $ 91 $ 175 $ 189 $ 65 $ 22 $ 8 $ — $ 550 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Non-Auto Risk rating: Pass $ 18 $ 59 $ 41 $ 20 $ 3 $ 2 $ 7 $ 150 Special mention — — — — — — — — Substandard — 1 — — — — — 1 Doubtful — — — — — — — — Total $ 18 $ 60 $ 41 $ 20 $ 3 $ 2 $ 7 $ 151 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 2023 2022 2021 2020 Prior Revolving Total Total Loans Risk rating: Pass $ 725 $ 2,093 $ 1,856 $ 984 $ 475 $ 747 $ 148 $ 7,028 Special mention 13 28 6 10 2 3 1 63 Substandard 8 31 14 21 16 46 3 139 Doubtful — — — — — — — — Total $ 746 $ 2,152 $ 1,876 $ 1,015 $ 493 $ 796 $ 152 $ 7,230 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at March 31, 2023 (dollars in millions): March 31, 2023 2022 2021 2020 2019 Prior Revolving Total C&I Risk rating: Pass $ 155 $ 548 $ 132 $ 48 $ 19 $ 28 $ — $ 930 Special mention 1 3 1 2 1 — — 8 Substandard 1 6 4 2 1 3 — 17 Doubtful — — — — — — — — Total $ 157 $ 557 $ 137 $ 52 $ 21 $ 31 $ — $ 955 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Municipal Risk rating: Pass $ 3 $ 82 $ 19 $ 15 $ 2 $ 99 $ — $ 220 Special mention — — — — 1 — — 1 Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 3 $ 82 $ 19 $ 15 $ 3 $ 99 $ — $ 221 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Agricultural Risk rating: Pass $ 16 $ 51 $ 5 $ 2 $ 1 $ 1 $ — $ 76 Special mention — 1 — — — — — 1 Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 16 $ 52 $ 5 $ 2 $ 1 $ 1 $ — $ 77 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Construction & Development Risk rating: Pass $ 111 $ 586 $ 124 $ 56 $ 12 $ 13 $ — $ 902 Special mention 3 9 — — — — — 12 Substandard 2 4 1 — — — — 7 Doubtful — — — — — — — — Total $ 116 $ 599 $ 125 $ 56 $ 12 $ 13 $ — $ 921 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Farm Risk rating: Pass $ 12 $ 142 $ 82 $ 31 $ 11 $ 28 $ — $ 306 Special mention — — — — — — — — Substandard — 2 — — — — — 2 Doubtful — — — — — — — — Total $ 12 $ 144 $ 82 $ 31 $ 11 $ 28 $ — $ 308 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 36 $ 244 $ 192 $ 96 $ 47 $ 91 $ — $ 706 Special mention — — 1 — 11 6 — 18 Substandard — 2 2 1 2 6 — 13 Doubtful — — — — — — — — Total $ 36 $ 246 $ 195 $ 97 $ 60 $ 103 $ — $ 737 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 73 $ 316 $ 247 $ 124 $ 74 $ 170 $ — $ 1,004 Special mention — 3 1 2 6 1 — 13 Substandard 1 3 2 1 3 16 — 26 Doubtful — — — — — — — — Total $ 74 $ 322 $ 250 $ 127 $ 83 $ 187 $ — $ 1,043 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Residential Risk rating: Pass $ 95 $ 479 $ 355 $ 181 $ 78 $ 268 $ 137 $ 1,593 Special mention — 1 3 2 — 4 1 11 Substandard 1 5 2 3 2 9 3 25 Doubtful — — — — — — — — Total $ 96 $ 485 $ 360 $ 186 $ 80 $ 281 $ 141 $ 1,629 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Auto Risk rating: Pass $ 51 $ 296 $ 116 $ 46 $ 20 $ 6 $ — $ 535 Special mention — — — — — — — — Substandard — 1 — 1 — — — 2 Doubtful — — — — — — — — Total $ 51 $ 297 $ 116 $ 47 $ 20 $ 6 $ — $ 537 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Non-Auto Risk rating: Pass $ 21 $ 74 $ 34 $ 7 $ 2 $ 2 $ 7 $ 147 Special mention — — — — — — — — Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 21 $ 74 $ 35 $ 7 $ 2 $ 2 $ 7 $ 148 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2023 2022 2021 2020 2019 Prior Revolving Total Total Loans Risk rating: Pass $ 573 $ 2,818 $ 1,306 $ 606 $ 266 $ 706 $ 144 $ 6,419 Special mention 4 17 6 6 19 11 1 64 Substandard 5 23 12 8 8 34 3 93 Doubtful — — — — — — — — Total $ 582 $ 2,858 $ 1,324 $ 620 $ 293 $ 751 $ 148 $ 6,576 Year-to-Date Gross Charge-Offs $ — $ — $ — $ — $ — $ — $ — $ — 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 March 31, 2024 and 2023, and December 31, 2023, the Company’s past due loans are as follows (dollars in thousands): March 31, 2024 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 6,462 $ 250 $ 1,594 $ 8,306 $ 1,183,210 $ 1,191,516 $ 33 Municipal 25 — — 25 210,988 211,013 — Total Commercial 6,487 250 1,594 8,331 1,394,198 1,402,529 33 Agricultural 624 — 71 695 87,187 87,882 — Real Estate: Construction & Development 9,277 258 1,347 10,882 910,891 921,773 — Farm 855 7 95 957 310,045 311,002 — Non-Owner Occupied CRE 1,840 19 1,374 3,233 850,488 853,721 — Owner Occupied CRE 3,269 — 70 3,339 1,029,506 1,032,845 — Residential 13,804 414 2,540 16,758 1,901,815 1,918,573 — Total Real Estate 29,045 698 5,426 35,169 5,002,745 5,037,914 — Consumer: Auto 967 120 — 1,087 548,750 549,837 — Non-Auto 219 13 — 232 151,016 151,248 — Total Consumer 1,186 133 — 1,319 699,766 701,085 — Total $ 37,342 $ 1,081 $ 7,091 $ 45,514 $ 7,183,896 $ 7,229,410 $ 33 March 31, 2023 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 3,952 $ 292 $ 1,825 $ 6,069 $ 948,617 $ 954,686 $ 14 Municipal 209 — — 209 221,170 221,379 — Total Commercial 4,161 292 1,825 6,278 1,169,787 1,176,065 14 Agricultural 816 25 24 865 76,152 77,017 — Real Estate: Construction & Development 7,058 332 — 7,390 913,800 921,190 — Farm 264 — 372 636 307,070 307,706 — Non-Owner Occupied CRE 3,183 — 695 3,878 733,239 737,117 — Owner Occupied CRE 3,886 — — 3,886 1,039,132 1,043,018 — Residential 7,484 744 767 8,995 1,619,846 1,628,841 — Total Real Estate 21,875 1,076 1,834 24,785 4,613,087 4,637,872 — Consumer: Auto 683 41 9 733 536,677 537,410 8 Non-Auto 136 — — 136 147,715 147,851 — Total Consumer 819 41 9 869 684,392 685,261 8 Total $ 27,671 $ 1,434 $ 3,692 $ 32,797 $ 6,543,418 $ 6,576,215 $ 22 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)	3 Months Ended
	Mar. 31, 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): March 31, 2024: Outstanding Asset Liability IRLCs $ 53,206 $ 803 $ — Forward mortgage-backed securities trades 70,000 — 91 March 31, 2023: Outstanding Asset Liability IRLCs $ 58,706 $ 827 $ — Forward mortgage-backed securities trades 69,500 — 334 December 31, 2023: Outstanding Asset Liability IRLCs $ 28,956 $ 427 $ — Forward mortgage-backed securities trades 35,000 — 288

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Borrowings	Borrowings consisted of the following (dollars in thousands): March 31, December 31, 2024 2023 2023 Securities sold under agreements with customers to repurchase $ 307,297 $ 608,299 $ 381,928 Federal funds purchased 5,750 3,575 1,100 Other borrowings 21,053 21,053 21,053 Total $ 334,100 $ 632,927 $ 404,081

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 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 three-months ended March 31, 2024 and 2023. For the Three-Months Ended March 31, 2024 2023 Restricted Weighted Restricted Weighted Balance at beginning of period 53,817 $ 37.04 39,657 $ 47.83 Grants — — — — Vesting — — — — Forfeited/expired ( 599 ) 33.89 ( 2,888 ) 47.87 Balance at end of period 53,218 $ 37.07 36,769 $ 47.83
Schedule of Changes in Performance Stock Units	The following table summarizes information about the changes in PSUs as of and for the three-months ended March 31, 2024 and 2023. For the Three-Months Ended March 31, 2024 2023 Performance-Based Restricted Weighted Performance-Based Restricted Weighted Balance at beginning of period 75,227 $ 40.24 47,082 $ 48.00 Grants — — — — Vesting ( 20,532 ) 48.91 — — Forfeited/expired ( 686 ) 35.61 ( 3,456 ) 48.04 Balance at end of period 54,009 $ 37.00 43,626 $ 48.00
Summary of Vested and Unvested Restricted Stock Outstanding	The following table summarizes information about vested and unvested restricted stock. For the Three-Months Ended March 31, 2024 2023 Restricted Weighted Restricted Weighted Balance at beginning of period 25,190 $ 27.79 24,813 $ 36.21 Grants — — — — Vesting — — ( 2,872 ) 28.25 Forfeited/expired — — ( 1,105 ) 29.70 Balance at end of period 25,190 $ 27.79 20,836 $ 37.53
Schedule of Analysis of Stock Option Activity	An analysis of stock option activity for the three-months ended March 31, 2024 is presented in the table and narrative below:​​​​​​​ Shares Weighted- Outstanding, December 31, 2023 1,552,249 $ 30.45 Granted — — Exercised ( 82,614 ) 20.77 Cancelled ( 21,692 ) 36.49 Outstanding, March 31, 2024 1,447,943 30.91 Exercisable, March 31, 2024 813,657 $ 25.85

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	3 Months Ended
	Mar. 31, 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): March 31, 2024 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 432,168 $ — $ — $ 432,168 Obligations of state and political subdivisions — 1,454,035 — 1,454,035 Corporate bonds — 99,717 — 99,717 Residential mortgage-backed securities — 2,299,277 — 2,299,277 Commercial mortgage-backed securities — 368,906 — 368,906 Other securities 4,423 — — 4,423 Total $ 436,591 $ 4,221,935 $ — $ 4,658,526 Loans held-for-sale $ — $ 15,080 $ — $ 15,080 IRLCs $ — $ — $ 803 $ 803 Forward mortgage-backed securities trades $ — $ ( 91 ) $ — $ ( 91 ) March 31, 2023 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 488,242 $ — $ — $ 488,242 Obligations of states and political subdivisions — 1,773,612 — 1,773,612 Corporate bonds — 99,620 — 99,620 Residential mortgage-backed securities — 2,583,170 — 2,583,170 Commercial mortgage-backed securities — 349,936 — 349,936 Other securities 3,977 — — 3,977 Total $ 492,219 $ 4,806,338 $ — $ 5,298,557 Loans held-for-sale $ — $ 11,766 $ — $ 11,766 IRLCs $ — $ — $ 827 $ 827 Forward mortgage-backed securities trades $ — $ ( 334 ) $ — $ ( 334 ) 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): March 31, December 31, 2024 2023 2023 Unpaid principal balance on loans held-for-sale $ 14,701 $ 11,416 $ 10,757 Net unrealized gains on loans held-for-sale 379 350 320 Loans held-for-sale at fair value $ 15,080 $ 11,766 $ 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-months ended March 31, 2024 and 2023 (dollars in thousand): Three-Months Ended 2024 2023 Realized gain on sale and fees on mortgage loans* $ 2,580 $ 2,859 Change in fair value on loans held-for-sale and IRLCs 351 534 Change in forward mortgage-backed securities trades 197 ( 419 ) Total gain on sale of mortgage loans $ 3,128 $ 2,974 * 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). March 31, December 31, 2024 2023 2023 Carrying Value Estimated Carrying Estimated Carrying Estimated Fair Value Cash and due from banks $ 222,464 $ 222,464 $ 224,875 $ 224,875 $ 281,354 $ 281,354 Level 1 Federal funds sold 12,300 12,300 — — — — Level 1 Interest-bearing demand deposits 365,397 365,397 221,336 221,336 255,237 255,237 Level 1 Available-for-sale securities 4,658,526 4,658,526 5,298,557 5,298,557 4,732,762 4,732,762 Levels 1 Loans held-for-investment, net of 7,139,847 7,141,043 6,495,397 6,464,027 7,060,057 7,036,722 Level 3 Loans held-for-sale 16,109 16,109 11,996 12,018 14,253 14,378 Level 2 Accrued interest receivable 56,278 56,278 50,658 50,658 58,544 58,544 Level 2 Deposits with stated maturities 938,541 938,459 739,498 736,434 938,980 938,534 Level 2 Deposits with no stated maturities 10,351,267 10,351,267 10,196,920 10,196,920 10,199,320 10,199,320 Level 1 Repurchase Agreements 307,297 307,297 608,299 608,299 381,928 381,928 Level 2 Borrowings 26,803 26,803 24,628 24,628 22,153 22,153 Level 2 Accrued interest payable 8,362 8,362 3,617 3,617 10,215 10,215 Level 2 IRLCs 803 803 827 827 427 427 Level 3 Forward mortgage-backed securities ( 91 ) ( 91 ) ( 334 ) ( 334 ) ( 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
	Sep. 30, 2023 $ / shares shares	Mar. 31, 2024 USD ($) Location shares	Mar. 31, 2023 USD ($) shares	Jul. 27, 2021 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
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
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		$ 441,227,000	$ 458,249,000		403,298,000
First financial antidilutive securities excluded from eps computation | shares		417,000	480,000
Shares repurchased under stock repurchase authorization, shares | shares	101,337
Deferred Tax Assets		$ 122,844,000	$ 122,947,000		110,800,000
Commitments to Extend Credit [Member]
Equity, Class of Treasury Stock [Line Items]
Reserve for unfunded commitments		7,455,000	10,397,000		7,903,000
Held-to-maturity Securities [Member]
Equity, Class of Treasury Stock [Line Items]
Securities held to maturity		$ 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
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net earnings per share, basic, Net Earnings	$ 53,397	$ 52,568
Effect of stock options and stock grants, Net Earnings	0	0
Net earnings per share, diluted, Net Earnings	$ 53,397	$ 52,568
Net earnings per share, basic, Weighted Average Shares	142,724,674	142,665,646
Effect of stock options and stock grants, Weighted Average Shares	304,775	400,365
Net earnings per share, diluted, Weighted Average Shares	143,029,449	143,066,011
Net earnings per share, basic, Per Share Amount	$ 0.37	$ 0.37
Effect of stock options and stock grants, Per Share Amount	0	0
Net earnings per share, diluted, Per Share Amount	$ 0.37	$ 0.37

Securities - Additional Informa

Securities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2024 USD ($) Investment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Interest Bearing Time Deposits In Banks And Securities [Line Items]
Interest Bearing Time Deposits In Banks	$ 0	$ 0	$ 0
Interest-bearing time deposits, maturity period, years	12 months	12 months	12 months
Number of investment positions | Investment	832
Securities pledged as collateral	$ 2,516,117,000
Sales of investment securities available-for-sale	0	$ 145,948,000
Gross realized gains from security sales	$ 0	1,052,000
Gross realized losses from security sales or calls		1,040,000
Available-for-Sale Securities [Member]
Interest Bearing Time Deposits In Banks And Securities [Line Items]
Sales of investment securities available-for-sale		$ 145,948,000
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	56.31%
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	66.95%

Securities - Summary of Availab

Securities - Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	$ 5,217,517	$ 5,243,681	$ 5,879,040
Securities available-for-sale, Gross Unrealized Holding Gains	694	945	1,611
Securities available-for-sale, Gross Unrealized Holding Losses	(559,685)	(511,864)	(582,094)
Available-for-sale securities	4,658,526	4,732,762	5,298,557
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	445,399	496,975	508,692
Securities available-for-sale, Gross Unrealized Holding Gains	0	4	32
Securities available-for-sale, Gross Unrealized Holding Losses	(13,231)	(14,745)	(20,482)
Available-for-sale securities	432,168	482,234	488,242
Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	1,592,523	1,621,405	1,935,401
Securities available-for-sale, Gross Unrealized Holding Gains	570	934	1,562
Securities available-for-sale, Gross Unrealized Holding Losses	(139,058)	(125,182)	(163,351)
Available-for-sale securities	1,454,035	1,497,157	1,773,612
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	2,685,896	2,716,968	2,957,314
Securities available-for-sale, Gross Unrealized Holding Gains	72	7	17
Securities available-for-sale, Gross Unrealized Holding Losses	(386,691)	(352,883)	(374,161)
Available-for-sale securities	2,299,277	2,364,092	2,583,170
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	381,198	295,663	364,956
Securities available-for-sale, Gross Unrealized Holding Gains	52	0	0
Securities available-for-sale, Gross Unrealized Holding Losses	(12,344)	(11,339)	(15,020)
Available-for-sale securities	368,906	284,324	349,936
Corporate Bonds and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	112,501	112,670	112,677
Securities available-for-sale, Gross Unrealized Holding Gains	0	0	0
Securities available-for-sale, Gross Unrealized Holding Losses	(8,361)	(7,715)	(9,080)
Available-for-sale securities	$ 104,140	$ 104,955	$ 103,597

Securities - Amortized Cost and

Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale, Amortized Cost Basis, Due within one year	$ 343,112
Available-for-Sale, Amortized Cost Basis, Due after one year through five years	1,374,546
Available-for-Sale, Amortized Cost Basis, Due after five years through ten years	2,421,721
Available-for-Sale, Amortized Cost Basis, Due after ten years	1,078,138
Available-for-Sale, Amortized Cost Basis, Total	5,217,517	$ 5,243,681	$ 5,879,040
Available-for-Sale, Estimated Fair Value, Due within one year	337,823
Available-for-Sale, Estimated Fair Value, Due after one year through five years	1,288,485
Available-for-Sale, Estimated Fair Value, Due after five years through ten years	2,126,343
Available-for-Sale, Estimated Fair Value, Due after ten years	905,875
Securities available-for-sale, Estimated Fair Value, Total	$ 4,658,526	$ 4,732,762	$ 5,298,557

Securities - Continuous Unreali

Securities - Continuous Unrealized-Loss Position of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value	$ 122,818	$ 16,963	$ 616,799
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	936	42	13,693
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	4,469,213	4,655,649	4,499,790
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	558,749	511,822	568,401
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	4,592,031	4,672,612	5,116,589
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	559,685	511,864	582,094
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	2,438	3,477	191,725
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	16	7	4,193
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	429,730	477,306	292,587
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	13,215	14,738	16,289
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	432,168	480,783	484,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	13,231	14,745	20,482
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	33,073	11,855	126,532
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	114	34	1,448
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	1,398,108	1,427,975	1,470,950
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	138,944	125,148	161,903
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,431,181	1,439,830	1,597,482
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	139,058	125,182	163,351
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	22,586	1,631	91,738
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	299	1	2,937
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	2,261,311	2,361,089	2,489,524
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	386,392	352,882	371,224
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,283,897	2,362,720	2,581,262
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	386,691	352,883	374,161
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	64,721	0	164,301
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	507	0	3,948
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	275,924	284,324	185,635
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	11,837	11,339	11,072
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	340,645	284,324	349,936
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	12,344	11,339	15,020
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	42,503
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	0	0	1,167
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	104,140	104,955	61,094
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	8,361	7,715	7,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	104,140	104,955	103,597
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	$ 8,361	$ 7,715	$ 9,080

Loans Held for Investment and_3

Loans Held for Investment and Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	$ 19,077	$ 17,573		$ 16,845
Loans collectively evaluated for credit losses	70,485	71,161		63,973
Total allowance for loan losses	89,562	88,734	$ 89,562	80,818	$ 75,834
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	5,711	5,858		7,523
Loans collectively evaluated for credit losses	10,395	9,840		8,560
Total allowance for loan losses	16,106	15,698		16,083	16,129
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	0	0		0
Loans collectively evaluated for credit losses	195	195		1,067
Total allowance for loan losses	195	195		1,067	1,026
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,243	2,401		2,397
Loans collectively evaluated for credit losses	22,568	26,152		26,230
Total allowance for loan losses	24,811	28,553		28,627	26,443
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	758	994		0
Loans collectively evaluated for credit losses	1,759	1,920		1,937
Total allowance for loan losses	2,517	2,914		1,937	1,957
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	3,007	3,684		2,081
Loans collectively evaluated for credit losses	11,961	9,741		6,970
Total allowance for loan losses	14,968	13,425	14,968	9,051	9,075
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,238	1,663		2,605
Loans collectively evaluated for credit losses	10,518	12,150		9,343
Total allowance for loan losses	12,756	13,813	12,756	11,948	9,928
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,256	2,159		1,663
Loans collectively evaluated for credit losses	11,309	9,495		8,039
Total allowance for loan losses	13,565	11,654	13,565	9,702	9,075
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	5	4		3
Loans collectively evaluated for credit losses	902	806		854
Total allowance for loan losses	907	810	907	857	845
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	129	60		2
Loans collectively evaluated for credit losses	365	331		330
Total allowance for loan losses	494	391	$ 494	332	315
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,730	750		571
Loans collectively evaluated for credit losses	513	531		643
Total allowance for loan losses	$ 3,243	$ 1,281		$ 1,214	$ 1,041

Loans Held for Investment and_4

Loans Held for Investment and Allowance for Loan Losses - Loans Held-for-Investment by Class of Financing Receivables (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 7,229,410	$ 7,148,791		$ 6,576,215
Total Real Estate	36,157	33,609		24,171
Less: Allowance for credit losses	(89,562)	(88,734)	$ (89,562)	(80,818)	$ (75,834)
Net loans held for investment	7,139,848	7,060,057		6,495,397
C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,191,516	1,164,811		954,686
Less: Allowance for credit losses	(16,106)	(15,698)		(16,083)	(16,129)
Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	211,013	214,850		221,379
Less: Allowance for credit losses	(195)	(195)		(1,067)	(1,026)
Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	921,773	963,158		921,190
Less: Allowance for credit losses	(24,811)	(28,553)		(28,627)	(26,443)
Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	311,002	344,954		307,706
Less: Allowance for credit losses	(2,517)	(2,914)		(1,937)	(1,957)
Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	853,721	827,969		737,117
Less: Allowance for credit losses	(14,968)	(13,425)	(14,968)	(9,051)	(9,075)
Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,032,845	1,037,281		1,043,018
Less: Allowance for credit losses	(12,756)	(13,813)	(12,756)	(11,948)	(9,928)
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,918,573	1,834,593		1,628,841
Less: Allowance for credit losses	(13,565)	(11,654)	(13,565)	(9,702)	(9,075)
Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	549,837	521,859		537,410
Less: Allowance for credit losses	(907)	(810)	(907)	(857)	(845)
Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	151,248	154,426		147,851
Less: Allowance for credit losses	(494)	(391)	$ (494)	(332)	(315)
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,402,529	1,379,661		1,176,065
Commercial [Member] | C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,191,516	1,164,811		954,686
Commercial [Member] | Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	211,013	214,850		221,379
Agriculture [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	87,882	84,890		77,017
Less: Allowance for credit losses	(3,243)	(1,281)		(1,214)	$ (1,041)
Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	5,037,914	5,007,955		4,637,872
Real Estate [Member] | Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	921,773	963,158		921,190
Real Estate [Member] | Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	311,002	344,954		307,706
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	853,721	827,969		737,117
Real Estate [Member] | Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,032,845	1,037,281		1,043,018
Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	1,918,573	1,834,593		1,628,841
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	701,085	676,285		685,261
Consumer [Member] | Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	549,837	521,859		537,410
Consumer [Member] | Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 151,248	$ 154,426		$ 147,851

Loans Held for Investment and_5

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	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Receivables [Abstract]
Non-accrual loans	$ 36,157	$ 33,609	$ 24,171
Loans still accruing and past due 90 days or more	33	1,004	22
Total	$ 36,190	$ 34,613	$ 24,193

Loans Held for Investment and_6

Loans Held for Investment and Allowance for Loan Losses - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 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	$ 37,204,000	$ 24,389,000	$ 35,096,000
Additional funds advanced in connection with impaired loans	0
Loans held by subsidiaries subject to blanket liens	5,095,506,000
Available line of credit	1,984,900,000
line of Credit	0
Undisbursed commitments	781,500,000
Reserve for unfunded commitments (Other liabilities)	7,455,000	10,397,000	7,903,000
Total Loans	7,229,410,000	6,576,215,000	$ 7,148,791,000
Provision for Loan and Lease Losses	1,256,000	4,707,000
Unfunded Loan Commitment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loan and Lease Losses	448,000	1,926,000
Reversal of Provision for credit losses	$ 808,000	$ 2,781,000

Loans Held for Investment and_7

Loans Held for Investment and Allowance for Loan Losses - Schedule of Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 36,157	$ 33,609	$ 24,171
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	3,950	4,132	5,343
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	3,950	4,132	5,343
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	2,043	155	161
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	29,350	28,741	18,187
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	1,976	1,444	773
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	4,597	4,804	452
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	9,243	8,022	2,907
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	5,719	6,822	6,823
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	7,815	7,649	7,232
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	814	581	480
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	486	464	398
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 328	$ 117	$ 82

Loans Held for Investment and_8

Loans Held for Investment and Allowance for Loan Losses - Changes in Allowance for Loan Losses (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 88,734,000	$ 75,834,000
Provision for Loan and Lease Losses	1,256,000	4,707,000
Recoveries	422,000	565,000
Charge-offs	(850,000)	(288,000)
Ending balance	89,562,000	80,818,000
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	15,698,000	16,129,000
Provision for Loan and Lease Losses	501,000	(64,000)
Recoveries	111,000	52,000
Charge-offs	(204,000)	(34,000)
Ending balance	16,106,000	16,083,000
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	195,000	1,026,000
Provision for Loan and Lease Losses	0	41,000
Recoveries	0	0
Charge-offs	0	0
Ending balance	195,000	1,067,000
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	28,553,000	26,443,000
Provision for Loan and Lease Losses	(3,709,000)	2,084,000
Recoveries	0	100,000
Charge-offs	(33,000)	0
Ending balance	24,811,000	28,627,000
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,914,000	1,957,000
Provision for Loan and Lease Losses	(397,000)	(20,000)
Recoveries	0	0
Charge-offs	0	0
Ending balance	2,517,000	1,937,000
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	13,425,000	9,075,000
Provision for Loan and Lease Losses	1,536,000	(49,000)
Recoveries	7,000	25,000
Charge-offs	0	0
Ending balance	14,968,000	9,051,000
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	13,813,000	9,928,000
Provision for Loan and Lease Losses	(1,099,000)	2,013,000
Recoveries	42,000	7,000
Charge-offs	0	0
Ending balance	12,756,000	11,948,000
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	11,654,000	9,075,000
Provision for Loan and Lease Losses	1,813,000	624,000
Recoveries	98,000	3,000
Charge-offs	0	0
Ending balance	13,565,000	9,702,000
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	810,000	845,000
Provision for Loan and Lease Losses	384,000	70,000
Recoveries	112,000	132,000
Charge-offs	(399,000)	(190,000)
Ending balance	907,000	857,000
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	391,000	315,000
Provision for Loan and Lease Losses	210,000	36,000
Recoveries	47,000	45,000
Charge-offs	(154,000)	(64,000)
Ending balance	494,000	332,000
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,281,000	1,041,000
Provision for Loan and Lease Losses	2,017,000	(28,000)
Recoveries	5,000	201,000
Charge-offs	(60,000)	0
Ending balance	$ 3,243,000	$ 1,214,000

Loans Held for Investment and_9

Loans Held for Investment and Allowance for Loan Losses - Schedule of loans that are individually evaluated for credit losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Impaired [Line Items]
Related Allowance	$ 19,077	$ 17,573	$ 16,845
Total Recorded Investment	201,587	176,213	157,056
Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	11,453	12,626	11,867
Recorded Investment With Allowance	24,704	20,983	12,304
Related Allowance	5,301	3,791	4,434
Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	13,776	13,782	12,411
Total Recorded Investment	165,430	142,604	132,885
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	5,711	5,858	7,523
Total Recorded Investment	42,013	23,498	26,391
Commercial [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	3,194	1,322	0
Recorded Investment With Allowance	756	2,810	5,343
Related Allowance	1,541	1,363	3,582
Commercial [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4,170	4,495	3,941
Total Recorded Investment	38,063	19,366	21,048
Commercial [Member] | C&I [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	5,711	5,858	7,523
Total Recorded Investment	41,454	22,765	25,484
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	3,194	1,322	0
Recorded Investment With Allowance	756	2,810	5,343
Related Allowance	1,541	1,363	3,582
Commercial [Member] | C&I [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4,170	4,495	3,941
Total Recorded Investment	37,504	18,633	20,141
Commercial [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0
Total Recorded Investment	559	733	907
Commercial [Member] | Municipal [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0
Recorded Investment With Allowance	0
Related Allowance	0
Commercial [Member] | Municipal [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0
Total Recorded Investment	559	733	907
Commercial [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance		937
Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,730	750	571
Total Recorded Investment	6,087	1,459	1,073
Agriculture [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	1,330	57	0
Recorded Investment With Allowance	713	98	161
Related Allowance	849	50	86
Agriculture [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,881	700	485
Total Recorded Investment	4,044	1,304	912
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	10,502	10,901	8,746
Total Recorded Investment	149,567	147,768	127,230
Real Estate [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	19,366	11,247	11,867
Recorded Investment With Allowance	9,984	17,494	6,320
Related Allowance	2,838	2,377	765
Real Estate [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	7,664	8,524	7,981
Total Recorded Investment	120,217	119,027	109,043
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,243	2,401	2,397
Total Recorded Investment	30,929	23,989	19,586
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	1,073	758	397
Recorded Investment With Allowance	903	686	376
Related Allowance	189	148	57
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,054	2,253	2,340
Total Recorded Investment	28,953	22,545	18,813
Real Estate [Member] | Farm [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	758	994	0
Total Recorded Investment	6,533	6,166	1,684
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	4,597	0	452
Recorded Investment With Allowance	0	4,804	0
Related Allowance	727		0
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	31	57	0
Total Recorded Investment	1,936	1,362	1,232
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,007	3,684	2,081
Total Recorded Investment	31,655	37,139	31,464
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	7,393	1,919	2,136
Recorded Investment With Allowance	1,850	6,103	771
Related Allowance	1,235	700	152
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,772	2,984	1,929
Total Recorded Investment	22,412	29,117	28,557
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,238	1,663	2,605
Total Recorded Investment	41,179	42,568	38,801
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	2,892	4,661	4,111
Recorded Investment With Allowance	2,827	2,161	2,712
Related Allowance	445	232	297
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,793	1,431	2,308
Total Recorded Investment	35,460	35,746	31,978
Real Estate [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,256	2,159	1,663
Total Recorded Investment	39,271	37,906	35,695
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	3,411	3,909	4,771
Recorded Investment With Allowance	4,404	3,740	2,461
Related Allowance	242	360	259
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,014	1,799	1,404
Total Recorded Investment	31,456	30,257	28,463
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	134	64	5
Total Recorded Investment	3,920	3,488	2,362
Consumer [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	814
Recorded Investment With Allowance	0	581	480
Related Allowance	73	1	1
Consumer [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	61	63	4
Total Recorded Investment	3,106	2,907	1,882
Consumer [Member] | Auto [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	5	4	3
Total Recorded Investment	2,828	2,589	1,648
Consumer [Member] | Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	486
Recorded Investment With Allowance	0	464	398
Related Allowance	1	1	1
Consumer [Member] | Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4	3	2
Total Recorded Investment	2,342	2,125	1,250
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	129	60	2
Total Recorded Investment	1,092	899	714
Consumer [Member] | Non-Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	328
Recorded Investment With Allowance	0	117	82
Related Allowance	72
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	57	60	2
Total Recorded Investment	$ 764	$ 782	$ 632

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	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	$ 201,587	$ 176,213	$ 157,056
Loans collectively evaluated for credit losses	7,027,823	6,972,578	6,419,159
Total Loans	7,229,410	7,148,791	6,576,215
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	41,454	22,765	25,484
Loans collectively evaluated for credit losses	1,150,062	1,142,046	929,202
Total Loans	1,191,516	1,164,811	954,686
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	559	733	907
Loans collectively evaluated for credit losses	210,454	214,117	220,472
Total Loans	211,013	214,850	221,379
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	30,929	23,989	19,586
Loans collectively evaluated for credit losses	890,844	939,169	901,604
Total Loans	921,773	963,158	921,190
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	6,533	6,166	1,684
Loans collectively evaluated for credit losses	304,469	338,788	306,022
Total Loans	311,002	344,954	307,706
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	31,655	37,139	31,464
Loans collectively evaluated for credit losses	822,066	790,830	705,653
Total Loans	853,721	827,969	737,117
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	41,179	42,568	38,801
Loans collectively evaluated for credit losses	991,666	994,713	1,004,217
Total Loans	1,032,845	1,037,281	1,043,018
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	39,271	37,906	35,695
Loans collectively evaluated for credit losses	1,879,302	1,796,687	1,593,146
Total Loans	1,918,573	1,834,593	1,628,841
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,828	2,589	1,648
Loans collectively evaluated for credit losses	547,009	519,270	535,762
Total Loans	549,837	521,859	537,410
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	1,092	899	714
Loans collectively evaluated for credit losses	150,156	153,527	147,137
Total Loans	151,248	154,426	147,851
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	6,087	1,459	1,073
Loans collectively evaluated for credit losses	81,795	83,431	75,944
Total Loans	87,882	84,890	77,017
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	5,037,914	5,007,955	4,637,872
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	921,773	963,158	921,190
Real Estate [Member] | Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	311,002	344,954	307,706
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	853,721	827,969	737,117
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	1,032,845	1,037,281	1,043,018
Real Estate [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	1,918,573	1,834,593	1,628,841
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	701,085	676,285	685,261
Consumer [Member] | Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	549,837	521,859	537,410
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	$ 151,248	$ 154,426	$ 147,851

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	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 746	$ 2,531	$ 582
2023	2,152	2,036	2,858
2022	1,876	1,062	1,324
2021	1,015	518	620
2020	493	240	293
Prior	796	613	751
Revolving Loans Amortized Cost Basis	152	149	148
Total	7,230	7,149	6,576
Charge-Off [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023		1
2022		1
2021	0
2020	0
Total	0	2
C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	244	733	157
2023	578	279	557
2022	228	75	137
2021	71	37	52
2020	34	16	21
Prior	37	25	31
Total	1,192	1,165	955
C&I [Member] | Charge-Off [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1
Total	0	1
Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5	25	3
2023	20	83	82
2022	81	16	19
2021	16	10	15
2020	10	1	3
Prior	79	80	99
Total	211	215	221
Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	21	64	16
2023	56	15	52
2022	6	4	5
2021	3	1	2
2020	1	1	1
Prior	1		1
Total	88	85	77
Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	125	532	116
2023	451	317	599
2022	244	79	125
2021	69	20	56
2020	19	9	12
Prior	14	6	13
Total	922	963	921
Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	23	101	12
2023	60	111	144
2022	101	73	82
2021	71	29	31
2020	27	8	11
Prior	29	23	28
Total	311	345	308
Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	59	169	36
2023	135	238	246
2022	245	175	195
2021	178	113	97
2020	112	54	60
Prior	125	79	103
Total	854	828	737
Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	28	158	74
2023	159	312	322
2022	312	225	250
2021	215	114	127
2020	111	70	83
Prior	208	158	187
Total	1,033	1,037	1,043
Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	132	482	96
2023	458	421	485
2022	429	318	360
2021	307	163	186
2020	154	70	80
Prior	293	239	281
Revolving Loans Amortized Cost Basis	145	142	141
Total	1,918	1,835	1,629
Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	91	195	51
2023	175	213	297
2022	189	75	116
2021	65	27	47
2020	22	10	20
Prior	8	2	6
Total	550	522	537
Auto [Member] | Charge-Off [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1
Total	0	1
Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	18		21
2023	60	72	74
2022	41	47	35
2021	20	22	7
2020	3	4	2
Prior	2	1	2
Revolving Loans Amortized Cost Basis	7	7	7
Total	151	154	148
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	725	2,488	573
2023	2,093	2,007	2,818
2022	1,856	1,041	1,306
2021	984	499	606
2020	475	214	266
Prior	747	578	706
Revolving Loans Amortized Cost Basis	148	145	144
Total	7,028	6,972	6,419
Pass [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	236	720	155
2023	551	276	548
2022	226	73	132
2021	70	36	48
2020	32	14	19
Prior	36	23	28
Total	1,151	1,142	930
Pass [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5	25	3
2023	20	83	82
2022	81	15	19
2021	15	10	15
2020	10	1	2
Prior	79	80	99
Total	210	214	220
Pass [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	18	63	16
2023	54	15	51
2022	6	4	5
2021	3	1	2
2020	1	1	1
Prior			1
Total	82	84	76
Pass [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	117	515	111
2023	438	311	586
2022	240	78	124
2021	63	20	56
2020	19	9	12
Prior	14	6	13
Total	891	939	902
Pass [Member] | Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	23	101	12
2023	58	111	142
2022	101	73	82
2021	71	24	31
2020	23	8	11
Prior	29	22	28
Total	305	339	306
Pass [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	59	167	36
2023	133	232	244
2022	244	172	192
2021	174	106	96
2020	104	41	47
Prior	108	73	91
Total	822	791	706
Pass [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	28	154	73
2023	155	305	316
2022	305	217	247
2021	202	114	124
2020	110	62	74
Prior	190	142	170
Total	990	994	1,004
Pass [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	130	477	95
2023	450	415	479
2022	424	313	355
2021	302	158	181
2020	151	67	78
Prior	281	229	268
Revolving Loans Amortized Cost Basis	141	138	137
Total	1,879	1,797	1,593
Pass [Member] | Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	91	195	51
2023	175	212	296
2022	188	74	116
2021	64	26	46
2020	22	10	20
Prior	8	2	6
Total	548	519	535
Pass [Member] | Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	18		21
2023	59	71	74
2022	41	47	34
2021	20	22	7
2020	3	4	2
Prior	2	1	2
Revolving Loans Amortized Cost Basis	7	7	7
Total	150	153	147
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	13	11	4
2023	28	11	17
2022	6	7	6
2021	10	2	6
2020	2	2	19
Prior	3	6	11
Revolving Loans Amortized Cost Basis	1	1	1
Total	63	40	64
Special Mention [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	6	1	1
2023	17	1	3
2022	1	0	1
2021			2
2020	0	1	1
Total	24	3	8
Special Mention [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020			1
Total			1
Special Mention [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1		1
Total	1		1
Special Mention [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	7	8	3
2023	6	2	9
2022	3
Total	16	10	12
Special Mention [Member] | Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1
Total	1
Special Mention [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023		5
2022	0	1	1
2021	1
2020	1		11
Prior	1	2	6
Total	3	8	18
Special Mention [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	1
2023	2	1	3
2022	1	4	1
2021	8	0	2
2020		1	6
Prior		1	1
Total	11	8	13
Special Mention [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		1
2023	1	2	1
2022	1	2	3
2021	1	2	2
2020	1
Prior	2	3	4
Revolving Loans Amortized Cost Basis	1	1	1
Total	7	11	11
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	8	32	5
2023	31	18	23
2022	14	14	12
2021	21	17	8
2020	16	24	8
Prior	46	29	34
Revolving Loans Amortized Cost Basis	3	3	3
Total	139	137	93
Substandard [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2	12	1
2023	10	2	6
2022	1	2	4
2021	1	1	2
2020	2	1	1
Prior	1	2	3
Total	17	20	17
Substandard [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1
2021	1
Total	1	1
Substandard [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3	1
2023	1
Prior	1
Total	5	1
Substandard [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1	9	2
2023	7	4	4
2022	1	1	1
2021	6
Total	15	14	7
Substandard [Member] | Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	1		2
2022	0
2021	0	5
2020	4
Prior	0	1
Total	5	6	2
Substandard [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	2
2023	2	1	2
2022	1	2	2
2021	3	7	1
2020	7	13	2
Prior	16	4	6
Total	29	29	13
Substandard [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	3	1
2023	2	6	3
2022	6	4	2
2021	5	0	1
2020	1	7	3
Prior	18	15	16
Total	32	35	26
Substandard [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2	4	1
2023	7	4	5
2022	4	3	2
2021	4	3	3
2020	2	3	2
Prior	10	7	9
Revolving Loans Amortized Cost Basis	3	3	3
Total	32	27	25
Substandard [Member] | Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023		1	1
2022	1	1
2021	1	1	1
Total	2	3	2
Substandard [Member] | Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	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		Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 7,230,000	$ 7,149,000	$ 6,576,000
Total Loans		7,229,410	7,148,791	6,576,215
Total 90 Days Past Due Still Accruing		33	1,004	22
C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,192,000	1,165,000	955,000
Total Loans		1,191,516	1,164,811	954,686
Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		211,000	215,000	221,000
Total Loans		211,013	214,850	221,379
Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		922,000	963,000	921,000
Total Loans		921,773	963,158	921,190
Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		311,000	345,000	308,000
Total Loans		311,002	344,954	307,706
Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		854,000	828,000	737,000
Total Loans		853,721	827,969	737,117
Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,033,000	1,037,000	1,043,000
Total Loans		1,032,845	1,037,281	1,043,018
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,918,000	1,835,000	1,629,000
Total Loans		1,918,573	1,834,593	1,628,841
Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		550,000	522,000	537,000
Total Loans		549,837	521,859	537,410
Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		151,000	154,000	148,000
Total Loans		151,248	154,426	147,851
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		1,402,529	1,379,661	1,176,065
Total 90 Days Past Due Still Accruing		33	141	14
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		1,191,516	1,164,811	954,686
Total 90 Days Past Due Still Accruing		33	141	14
Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		211,013	214,850	221,379
Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		87,882	84,890	77,017
Total 90 Days Past Due Still Accruing		0
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		5,037,914	5,007,955	4,637,872
Total 90 Days Past Due Still Accruing		0	863	0
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		921,773	963,158	921,190
Total 90 Days Past Due Still Accruing			863
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		311,002	344,954	307,706
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		853,721	827,969	737,117
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		1,032,845	1,037,281	1,043,018
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		1,918,573	1,834,593	1,628,841
Total 90 Days Past Due Still Accruing		0		0
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		701,085	676,285	685,261
Total 90 Days Past Due Still Accruing				8
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		549,837	521,859	537,410
Total 90 Days Past Due Still Accruing				8
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		151,248	154,426	147,851
15-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	37,342	40,151	27,671
15-59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	6,487	8,891	4,161
15-59 Days Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	6,462	8,789	3,952
15-59 Days Past Due [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	25	102	209
15-59 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	624	850	816
15-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	29,045	28,587	21,875
15-59 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	9,277	8,887	7,058
15-59 Days Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	855	1,024	264
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]	1,840	3,565	3,183
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]	3,269	2,818	3,886
15-59 Days Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	13,804	12,293	7,484
15-59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	1,186	1,823	819
15-59 Days Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	967	1,482	683
15-59 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[1]	219	341	136
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,081	5,550	1,434
60-89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		250	1,624	292
60-89 Days Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		250	1,624	292
60-89 Days Past Due [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
60-89 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	246	25
60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		698	3,378	1,076
60-89 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		258	2,115	332
60-89 Days Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		7	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		19	0
60-89 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	240	0
60-89 Days Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		414	828	744
60-89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		133	302	41
60-89 Days Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		120	251	41
60-89 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		13	51	0
Greater than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		7,091	8,223	3,692
Greater than 90 Days [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,594	1,700	1,825
Greater than 90 Days [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,594	1,700	1,825
Greater than 90 Days [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		71	4	24
Greater than 90 Days [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,426	6,495	1,834
Greater than 90 Days [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,347	1,856
Greater than 90 Days [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		95		372
Greater than 90 Days [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,374		695
Greater than 90 Days [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		70	1,823
Greater than 90 Days [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,540	2,816	767
Greater than 90 Days [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	24	9
Greater than 90 Days [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	24	9
Greater than 90 Days [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		45,514	53,924	32,797
Total Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		8,331	12,215	6,278
Total Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		8,306	12,113	6,069
Total Past Due [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		25	102	209
Total Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		695	1,100	865
Total Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		35,169	38,460	24,785
Total Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		10,882	12,858	7,390
Total Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		957	1,219	636
Total Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,233	3,565	3,878
Total Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,339	4,881	3,886
Total Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		16,758	15,937	8,995
Total Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,319	2,149	869
Total Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,087	1,757	733
Total Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		232	392	136
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		7,183,896	7,094,867	6,543,418
Current [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,394,198	1,367,446	1,169,787
Current [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,183,210	1,152,698	948,617
Current [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		210,988	214,748	221,170
Current [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		87,187	83,790	76,152
Current [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,002,745	4,969,495	4,613,087
Current [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		910,891	950,300	913,800
Current [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		310,045	343,735	307,070
Current [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		850,488	824,404	733,239
Current [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,029,506	1,032,400	1,039,132
Current [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,901,815	1,818,656	1,619,846
Current [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		699,766	674,136	684,392
Current [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		548,750	520,102	536,677
Current [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 151,016	$ 154,034	$ 147,715
[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 ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Loans Receivables Held For Sale Net [Abstract]
Loans held for sale	$ 16,109,000	$ 14,253,000	$ 11,996,000
Loans held-for-sale at the lower of cost or fair value	$ 1,029,000	$ 3,176,000	$ 230,000

Derivative Financial Instrume_3

Derivative Financial Instruments - Summary of Outstanding Notional Balances and Fair Values of Outstanding Derivative Positions (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
IRLCs [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding Notional Balance	$ 53,206	$ 28,956	$ 58,706
Asset Derivative Fair Value	803	427	827
Liability Derivative Fair Value	0	0	0
Forward Mortgage-Backed Securities Trades [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding Notional Balance	70,000	35,000	69,500
Asset Derivative Fair Value	0	0	0
Liability Derivative Fair Value	$ 91	$ 288	$ 334

Borrowings - Schedule of Borrow

Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Debt Disclosure [Abstract]
Securities sold under agreements with customers to repurchase	$ 307,297	$ 381,928	$ 608,299
Federal funds purchased	5,750	1,100	3,575
Other borrowings	21,053	21,053	21,053
Total	26,803	22,153	24,628
Total	$ 334,100	$ 404,081	$ 632,927

Borrowings - Additional Informa

Borrowings - Additional Information (Detail)	3 Months Ended
	Mar. 31, 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		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Income Taxes [Line Items]
Federal statutory tax rate	21%
Income tax expense	$ 11,480,000	$ 11,688,000
Effective tax rates on pre-tax income	17.70%	18.19%
Initial capital contribution commitment	$ 5,500,000
Initial contribution included in other assets	978,000	$ 131,000	$ 615,000
Leveraged loan, invest in other borrowings	$ 21,053,000
NMTC Investments [Member]
Income Taxes [Line Items]
Tax Benefit Percent of Qualified Investments	0.39
Investment related liabilities	$ 25,411,000	26,553,000	25,738,000
FFB Paris Investment Fund, LLC [Member]
Income Taxes [Line Items]
Loan investment	18,000,000	18,000,000	18,000,000
Leveraged loan, invest in other borrowings	$ 21,053,000	$ 21,053,000	$ 21,053,000

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 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	$ 4,723,000
Weighted-average period of unrecognized compensation cost recognition, years	1 year 5 months 8 days
Total fair value of shares vested	$ 46,000	$ 15,000
Stock compensation expense	485,000	444,000
Dividends Payable	25,754,000	24,274,000	$ 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
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement amount in assets	$ 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	1,617,290			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	$ 111,000	82,000	$ 124,000
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	OTHER LIABILITIES
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vested	$ 650,000	98,000
Restricted Stock [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 175,000	150,000
Restricted Stock [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		358,000
Employee Stock Option [Member]
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] | 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%
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]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan	$ 2,514,000	$ 2,576,000
Weighted-average period of unrecognized compensation cost recognition, years	1 year 1 month 20 days	1 year 2 months 1 day
Restricted Stock Units [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 469,000

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Changes in Stock Units (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	25,190	24,813
Grants	0	0
Vesting	0	(2,872)
Forfeited/expired	0	(1,105)
Balance at end of period	25,190	20,836
Balance at beginning of period	$ 27.79	$ 36.21
Weighted Average Grant Date Fair Value, Grants	0	0
Weighted Average Grant Date Fair Value, Vesting	0	28.25
Weighted Average Grant Date Fair Value, Forfeited/expired	0	29.7
Balance at end of period	$ 27.79	$ 37.53
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	0	0
Vesting	0	0
Forfeited/expired	(599)	(2,888)
Balance at end of period	53,218	36,769
Balance at beginning of period	$ 37.04	$ 47.83
Weighted Average Grant Date Fair Value, Grants	0	0
Weighted Average Grant Date Fair Value, Vesting	0	0
Weighted Average Grant Date Fair Value, Forfeited/expired	33.89	47.87
Balance at end of period	$ 37.07	$ 47.83
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	75,227	47,082
Grants	0	0
Vesting	(20,532)	0
Forfeited/expired	(686)	(3,456)
Balance at end of period	54,009	43,626
Balance at beginning of period	$ 40.24	$ 48
Weighted Average Grant Date Fair Value, Grants	0	0
Weighted Average Grant Date Fair Value, Vesting	48.91	0
Weighted Average Grant Date Fair Value, Forfeited/expired	35.61	48.04
Balance at end of period	$ 37	$ 48

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Vested and Unvested Restricted Stock Outstanding (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Balance at beginning of period	25,190	24,813
Grants	0	0
Vesting	0	(2,872)
Forfeited/expired	0	(1,105)
Balance at end of period	25,190	20,836
Balance at beginning of period	$ 27.79	$ 36.21
Grants	0	0
Vesting	0	28.25
Forfeited/expired	0	29.7
Balance at end of period	$ 27.79	$ 37.53

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of Analysis of Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Share-Based Payment Arrangement [Abstract]
Outstanding, beginning of period, Shares | shares	1,552,249
Shares, Granted | shares	0
Exercised, Shares | shares	(82,614)
Cancelled, Shares | shares	(21,692)
Outstanding, end of period, Shares | shares	1,447,943
Exercisable at end ofperiod, Shares | shares	813,657
Outstanding, beginning of period, Weighted-Average Ex. Price | $ / shares	$ 30.45
Granted, Weighted-Average Ex. Price | $ / shares	0
Exercised, Weighted-Average Ex. Price | $ / shares	20.77
Cancelled, Weighted-Average Ex. Price | $ / shares	36.49
Outstanding, end of period, Weighted-Average Ex. Price | $ / shares	30.91
Exercisable at end of period, Weighted-Average Ex. Price | $ / shares	$ 25.85

Fair Value Disclosures - Additi

Fair Value Disclosures - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) Loans	Mar. 31, 2023 USD ($) 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
Other real estate owned, total	937,000	175,000	$ 483,000
Real state owned	454,000	175,000
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
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
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

Fair Value Disclosures - Financ

Fair Value Disclosures - Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Available-for-sale investment securities:
Available-for-sale securities	$ 4,658,526,000	$ 4,732,762,000	$ 5,298,557,000
Loans held for sale	16,109,000	14,253,000	11,996,000
U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	432,168,000	482,234,000	488,242,000
Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Available-for-sale securities	1,454,035,000	1,497,157,000	1,773,612,000
Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	2,299,277,000	2,364,092,000	2,583,170,000
Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	368,906,000	284,324,000	349,936,000
IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	803,000	427,000	827,000
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	0
Forward mortgage-backed securities trades asset (liability)	91,000	288,000	334,000
Level 2 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Forward mortgage-backed securities trades asset (liability)	(91,000)	(288,000)	(334,000)
Fair Value, Measurements, Recurring [Member]
Available-for-sale investment securities:
Available-for-sale securities	4,658,526,000	4,732,762,000	5,298,557,000
Loans held for sale	15,080,000	11,077,000	11,766,000
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	432,168,000	482,234,000	488,242,000
Fair Value, Measurements, Recurring [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Available-for-sale securities	1,454,035,000	1,497,157,000	1,773,612,000
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	2,299,277,000	2,364,092,000	2,583,170,000
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	368,906,000	284,324,000	349,936,000
Fair Value, Measurements, Recurring [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	803,000	427,000	827,000
Fair Value, Measurements, Recurring [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Forward mortgage-backed securities trades asset (liability)	(91,000)	(288,000)	(334,000)
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Available-for-sale securities	99,717,000	100,471,000	99,620,000
Fair Value, Measurements, Recurring [Member] | Collateralized Securities, Other [Member]
Available-for-sale investment securities:
Available-for-sale securities	4,423,000	4,484,000	3,977,000
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Available-for-sale investment securities:
Available-for-sale securities	436,591,000	486,718,000	492,219,000
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:
Available-for-sale securities	432,168,000	482,234,000	488,242,000
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	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:
Asset Derivative Fair Value			0
Forward mortgage-backed securities trades asset (liability)	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Collateralized Securities, Other [Member]
Available-for-sale investment securities:
Available-for-sale securities	4,423,000	4,484,000	3,977,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Available-for-sale investment securities:
Available-for-sale securities	4,221,935,000	4,246,044,000	4,806,338,000
Loans held for sale	15,080,000	11,077,000	11,766,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Available-for-sale securities	1,454,035,000	1,497,157,000	1,773,612,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	2,299,277,000	2,364,092,000	2,583,170,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	368,906,000	284,324,000	349,936,000
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)	(91,000)	(288,000)	(334,000)
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Available-for-sale securities	99,717,000	100,471,000	99,620,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Collateralized Securities, Other [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Available-for-sale investment securities:
Available-for-sale securities	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:
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	803,000	427,000	827,000
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value			0
Forward mortgage-backed securities trades asset (liability)	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Collateralized Securities, Other [Member]
Available-for-sale investment securities:
Available-for-sale securities	$ 0	$ 0	$ 0

Fair Value Disclosures - Summar

Fair Value Disclosures - Summary of Loans Held-for-Sale at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Fair Value Measurements Loans Held For Sale [Abstract]
Unpaid principal balance on loans held-for-sale	$ 14,701	$ 10,757	$ 11,416
Net unrealized gains on loans held-for-sale	379	320	350
Loans held-for-sale at fair value	$ 15,080	$ 11,077	$ 11,766

Fair Value Disclosures - Schedu

Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 2,580	$ 2,859
Change in fair value on loans held-for-sale and IRLCs		351	534
Change in forward mortgage-backed securities trades		197	(419)
Total gain on sale of mortgage loans		$ 3,128	$ 2,974
[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 ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 222,464,000	$ 224,875,000	$ 281,354,000
FEDERAL FUNDS SOLD	12,300,000	0	0
INTEREST-BEARING DEMAND DEPOSITS IN BANKS	365,397,000	221,336,000	255,237,000
Available-for-sale securities	4,658,526,000	5,298,557,000	4,732,762,000
Loans held-for-investment, net allowance for credit losses	7,139,848,000	6,495,397,000	7,060,057,000
Loans held for sale	16,109,000	11,996,000	14,253,000
Borrowings	26,803,000	24,628,000	22,153,000
IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRLCs	803,000	827,000	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	0	0
Forward mortgage-backed securities trades asset (liability)	91,000	334,000	288,000
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)	(91,000)	(334,000)	(288,000)
Carrying Value [Member] | Level 1 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	222,464,000	224,875,000	281,354,000
FEDERAL FUNDS SOLD	12,300,000	0	0
INTEREST-BEARING DEMAND DEPOSITS IN BANKS	365,397,000	221,336,000	255,237,000
Deposits with no stated maturities	10,351,267,000	10,196,920,000	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	16,109,000	11,996,000	14,253,000
Accrued interest receivable	56,278,000	50,658,000	58,544,000
Deposits with stated maturities	938,541,000	739,498,000	938,980,000
Repurchase Agreements	307,297,000	608,299,000	381,928,000
Borrowings	26,803,000	24,628,000	22,153,000
Accrued interest payable	8,362,000	3,617,000	10,215,000
Carrying Value [Member] | Level 2 Inputs [Member] | IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRLCs	803,000	827,000	427,000
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)	(91,000)	(334,000)	(288,000)
Carrying Value [Member] | Levels 1 and 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	4,658,526,000	5,298,557,000	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 allowance for credit losses	7,139,847,000	6,495,397,000	7,060,057,000
Estimated Fair Value [Member] | Level 1 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	222,464,000	224,875,000	281,354,000
FEDERAL FUNDS SOLD	12,300,000	0	0
INTEREST-BEARING DEMAND DEPOSITS IN BANKS	365,397,000	221,336,000	255,237,000
Deposits with no stated maturities	10,351,267,000	10,196,920,000	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	16,109,000	12,018,000	14,378,000
Accrued interest receivable	56,278,000	50,658,000	58,544,000
Deposits with stated maturities	938,459,000	736,434,000	938,534,000
Repurchase Agreements	307,297,000	608,299,000	381,928,000
Borrowings	26,803,000	24,628,000	22,153,000
Accrued interest payable	8,362,000	3,617,000	10,215,000
Estimated Fair Value [Member] | Level 2 Inputs [Member] | IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRLCs	803,000	827,000	427,000
Estimated Fair Value [Member] | Levels 1 and 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	4,658,526,000	5,298,557,000	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 allowance for credit losses	$ 7,141,043,000	$ 6,464,027,000	$ 7,036,722,000