First Financial Bankshares (FFIN) 10-Q 2 Nov 22 2022 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2022	Nov. 02, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Document Period End Date	Sep. 30, 2022
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		142,641,666

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
ASSETS
CASH AND DUE FROM BANKS	$ 227,298,000	$ 205,053,000	$ 201,901,000
INTEREST-BEARING DEMAND DEPOSITS IN BANKS	138,484,000	323,535,000	359,241,000
Total cash and cash equivalents	365,782,000	528,588,000	561,142,000
SECURITIES AVAILABLE-FOR-SALE, at fair value (amortized cost of these securities was $6,546,471, $5,981,374 and $6,447,510 as of September 30, 2022 and 2021, and December 31, 2021, respectively)	5,745,443,000	6,573,179,000	6,119,984,000
LOANS:
Held-for-investment, excluding PPP loans	6,255,286,000	5,336,179,000	5,147,160,000
PPP loans	202,000	52,793,000	139,334,000
Total loans held-for-investment	6,255,488,000	5,388,972,000	5,286,494,000
Less—allowance for credit losses	(74,108,000)	(63,465,000)	(63,370,000)
Net loans held for investment	6,181,380,000	5,325,507,000	5,223,124,000
Held-for-sale ($15,892, $46,081 and $34,122 at fair value at September 30, 2022 and 2021, and December 31, 2021, respectively)	18,815,000	37,810,000	47,721,000
BANK PREMISES AND EQUIPMENT, net	152,646,000	149,764,000	147,516,000
INTANGIBLE ASSETS, net	315,833,000	316,779,000	317,170,000
OTHER ASSETS	330,445,000	170,834,000	126,601,000
Total assets	13,110,344,000	13,102,461,000	12,543,258,000
LIABILITIES AND SHAREHOLDERS' EQUITY
NONINTEREST-BEARING DEPOSITS	4,200,792,000	3,780,230,000	3,574,405,000
INTEREST-BEARING DEPOSITS	6,941,326,000	6,786,258,000	6,318,712,000
Total deposits	11,142,118,000	10,566,488,000	9,893,117,000
BORROWINGS	774,581,000	671,152,000	648,679,000
TRADE DATE PAYABLE	0	0	174,236,000
OTHER LIABILITIES	61,030,000	105,597,000	93,491,000
Total liabilities	11,977,729,000	11,343,237,000	10,809,523,000
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY:
COMMON STOCK - ($0.01 par value, authorized 200,000,000 shares; 142,628,163, 142,467,687 and 142,532,116 shares issued at September 30, 2022 and 2021, and December 31, 2021, respectively)	1,426,000	1,425,000	1,425,000
CAPITAL SURPLUS	676,067,000	676,871,000	675,139,000
RETAINED EARNINGS	1,087,543,000	981,675,000	947,724,000
TREASURY STOCK (shares at cost: 933,152, 937,803 and 936,897 at September 30, 2022 and 2021, and December 31, 2021, respectively)	(10,907,000)	(10,090,000)	(9,876,000)
DEFERRED COMPENSATION	10,907,000	10,090,000	9,876,000
ACCUMULATED OTHER COMPREHENSIVE EARNINGS (LOSS), net	(632,421,000)	99,253,000	109,447,000
Total shareholders' equity	1,132,615,000	1,759,224,000	1,733,735,000
Total liabilities and shareholders' equity	$ 13,110,344,000	$ 13,102,461,000	$ 12,543,258,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Statement of Financial Position [Abstract]
Securities, Available-for-sale, Amortized Cost	$ 6,546,471	$ 6,447,510	$ 5,981,374
Loans held-for-sale, fair value	$ 15,892	$ 34,122	$ 46,081
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	142,628,163	142,532,116	142,467,687
Treasury stock, shares	933,152	936,897	937,803

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
INTEREST INCOME:
Interest and fees on loans	$ 77,523,000	$ 70,588,000	$ 210,180,000	$ 203,902,000
Interest on investment securities:
Taxable	20,799,000	12,122,000	57,772,000	33,834,000
Exempt from federal income tax	12,974,000	14,249,000	41,686,000	42,058,000
Interest on federal funds sold and interest-bearing demand deposits in banks	1,432,000	239,000	2,080,000	616,000
Total interest income	112,728,000	97,198,000	311,718,000	280,410,000
INTEREST EXPENSE:
Interest on deposits	8,788,000	1,340,000	13,123,000	4,595,000
Interest on borrowings	784,000	76,000	1,217,000	260,000
Total interest expense	9,572,000	1,416,000	14,340,000	4,855,000
Net interest income	103,156,000	95,782,000	297,378,000	275,555,000
Provision for Credit losses	3,221,000	0	13,353,000	(3,203,000)
Net interest income after provision for credit losses	99,935,000	95,782,000	284,025,000	278,758,000
NONINTEREST INCOME:
Trust fees	10,314,000	9,484,000	29,873,000	26,475,000
Service charges on deposit accounts	6,399,000	5,673,000	18,143,000	15,394,000
Debit card fees	5,587,000	9,198,000	24,381,000	26,552,000
Credit card fees	651,000	595,000	1,953,000	1,771,000
Gain on sale and fees on mortgage loans	4,070,000	8,788,000	16,131,000	26,973,000
Net gain on sale of available-for-sale securities	334,000	1,000	2,013,000	814,000
Net gain on sale of foreclosed assets	349,000	27,000	1,451,000	83,000
Net gain (loss) on sale of other assets	526,000	(6,000)	522,000	213,000
Interest on loan recoveries	664,000	1,746,000	2,596,000	2,832,000
Other	2,049,000	2,220,000	6,078,000	6,166,000
Total noninterest income	30,943,000	37,726,000	103,141,000	107,273,000
NONINTEREST EXPENSE:
Salaries, commissions and employee benefits	33,892,000	37,090,000	101,177,000	107,067,000
Net occupancy expense	3,440,000	3,288,000	9,957,000	9,676,000
Equipment expense	2,396,000	2,450,000	6,999,000	6,791,000
FDIC insurance premiums	917,000	815,000	2,690,000	2,282,000
Debit card expense	3,013,000	2,929,000	9,177,000	8,736,000
Professional and service fees	2,219,000	2,406,000	6,635,000	6,936,000
Printing, stationery and supplies	600,000	432,000	1,641,000	1,246,000
Operational and other losses	869,000	1,087,000	2,247,000	1,908,000
Software amortization and expense	2,564,000	2,855,000	7,543,000	8,303,000
Amortization of intangible assets	306,000	398,000	946,000	1,222,000
Other	9,226,000	9,189,000	27,988,000	25,869,000
Total noninterest expense	59,442,000	62,939,000	177,000,000	180,036,000
EARNINGS BEFORE INCOME TAXES	71,436,000	70,569,000	210,166,000	205,995,000
INCOME TAX EXPENSE	12,095,000	11,641,000	34,359,000	33,770,000
NET EARNINGS	$ 59,341,000	$ 58,928,000	$ 175,807,000	$ 172,225,000
NET EARNINGS PER SHARE, BASIC	$ 0.42	$ 0.41	$ 1.23	$ 1.21
NET EARNINGS PER SHARE, DILUTED	0.41	0.41	1.23	1.20
DIVIDENDS PER SHARE	$ 0.17	$ 0.15	$ 0.49	$ 0.43

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Earnings (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
NET EARNINGS	$ 59,341	$ 58,928	$ 175,807	$ 172,225
OTHER ITEMS OF COMPREHENSIVE EARNINGS (LOSS):
Change in unrealized gain (loss) on investment securities available-for-sale, before income taxes	(293,219)	(34,224)	(924,157)	(76,335)
Reclassification adjustment for realized gains (loss) on investment securities included in net earnings, before income taxes	(334)	(1)	(2,013)	(814)
Total other items of comprehensive earnings (loss)	(293,553)	(34,225)	(926,170)	(77,149)
Income tax benefit (expense) related to:
Change in unrealized gain on investment securities available-for-sale	61,576	7,186	194,073	16,029
Reclassification adjustment for realized gains (loss) on investment securities included in net earnings	70	0	423	172
Total income tax benefit (expense)	61,646	7,186	194,496	16,201
COMPREHENSIVE EARNINGS (LOSS)	$ (172,566)	$ 31,889	$ (555,867)	$ 111,277

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - 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, 2020	$ 1,678,190	$ 1,422	$ 669,644	$ 836,729	$ (9,126)	$ 9,126	$ 170,395
Beginning Balance, Shares at Dec. 31, 2020		142,161,834
Treasury Stock, Beginning Balance, Shares at Dec. 31, 2020					(938,591)
Net earnings (Unaudited)	172,225			172,225
Stock option exercises (unaudited)	4,676	$ 3	4,673
Stock option exercises, Shares		273,167
Restricted stock grant/forfeiture, net (unaudited)	(165)		(165)
Restricted stock grant/forfeiture, net (unaudited), Shares		32,686
Cash dividends declared	(61,230)			(61,230)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	(60,948)						(60,948)
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (750)	750
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					788
Stock option expense (unaudited)	987		987
Ending Balance at Sep. 30, 2021	$ 1,733,735	$ 1,425	675,139	947,724	$ (9,876)	9,876	109,447
Ending Balance, Shares at Sep. 30, 2021		142,467,687
Treasury Stock, Ending Balance, Shares at Sep. 30, 2021	(937,803)				(937,803)
Beginning Balance at Jun. 30, 2021	$ 1,720,369	$ 1,424	672,288	910,171	$ (9,641)	9,641	136,486
Beginning Balance, Shares at Jun. 30, 2021		142,359,774
Treasury Stock, Beginning Balance, Shares at Jun. 30, 2021					(938,629)
Net earnings (Unaudited)	58,928			58,928
Stock option exercises (unaudited)	2,058	$ 1	2,057
Stock option exercises, Shares		107,796
Restricted stock grant/forfeiture, net (unaudited)	498		498
Restricted stock grant/forfeiture, net (unaudited), Shares		117
Cash dividends declared	(21,375)			(21,375)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	(27,039)						(27,039)
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (235)	235
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					826
Stock option expense (unaudited)	296		296
Ending Balance at Sep. 30, 2021	$ 1,733,735	$ 1,425	675,139	947,724	$ (9,876)	9,876	109,447
Ending Balance, Shares at Sep. 30, 2021		142,467,687
Treasury Stock, Ending Balance, Shares at Sep. 30, 2021	(937,803)				(937,803)
Beginning Balance at Dec. 31, 2021	$ 1,759,224	$ 1,425	676,871	981,675	$ (10,090)	10,090	99,253
Beginning Balance, Shares at Dec. 31, 2021		142,532,116
Treasury Stock, Beginning Balance, Shares at Dec. 31, 2021	(936,897)				(936,897)
Net earnings (Unaudited)	$ 175,807			175,807
Stock option exercises (unaudited)	5,974	$ 3	5,971
Stock option exercises, Shares		322,324
Restricted stock grant/forfeiture, net (unaudited)	1,681		1,681
Restricted stock grant/forfeiture, net (unaudited), Shares		18,282
Cash dividends declared	(69,939)			(69,939)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	(731,674)						(731,674)
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (817)	817
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					(3,745)
Stock option expense (unaudited)	991		991
Shares repurchased under stock repurchase authorization (unaudited)	(9,449)	$ (2)	(9,447)
Shares repurchased under stock repurchase authorization (unaudited), Shares		(244,559)
Ending Balance at Sep. 30, 2022	$ 1,132,615	$ 1,426	676,067	1,087,543	$ (10,907)	10,907	(632,421)
Ending Balance, Shares at Sep. 30, 2022		142,628,163
Treasury Stock, Ending Balance, Shares at Sep. 30, 2022	(933,152)				(933,152)
Beginning Balance at Jun. 30, 2022	$ 1,329,018	$ 1,426	675,653	1,052,453	$ (10,656)	10,656	(400,514)
Beginning Balance, Shares at Jun. 30, 2022		142,586,601
Treasury Stock, Beginning Balance, Shares at Jun. 30, 2022					(937,924)
Net earnings (Unaudited)	59,341			59,341
Stock option exercises (unaudited)	1,628		1,628
Stock option exercises, Shares		87,739
Restricted stock grant/forfeiture, net (unaudited)	471		471
Restricted stock grant/forfeiture, net (unaudited), Shares		(6,395)
Cash dividends declared	(24,251)			(24,251)
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited)	(231,907)						(231,907)
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)					$ (251)	251
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares					4,772
Stock option expense (unaudited)	359		359
Shares repurchased under stock repurchase authorization (unaudited)	(2,044)		(2,044)
Shares repurchased under stock repurchase authorization (unaudited), Shares		(52,572)
Ending Balance at Sep. 30, 2022	$ 1,132,615	$ 1,426	$ 676,067	$ 1,087,543	$ (10,907)	$ 10,907	$ (632,421)
Ending Balance, Shares at Sep. 30, 2022		142,628,163
Treasury Stock, Ending Balance, Shares at Sep. 30, 2022	(933,152)				(933,152)

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Cash dividend per share	$ 0.17	$ 0.15	$ 0.49	$ 0.43
Retained Earnings [Member]
Cash dividend per share	$ 0.17	$ 0.15	$ 0.49	$ 0.43

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 175,807,000	$ 172,225,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	9,589,000	9,746,000
Provision for Credit losses	13,353,000	(3,203,000)
Securities premium amortization, net	55,355,000	48,333,000
Discount accretion on purchased loans	(1,119,000)	(1,771,000)
Gain on sale of securities and other assets, net	(3,986,000)	(1,110,000)
Change in loans held-for-sale	17,967,000	34,562,000
Change in other assets	13,508,000	6,308,000
Change in other liabilities	(26,068,000)	780,000
Total adjustments	78,599,000	93,645,000
Net cash provided by operating activities	254,406,000	265,870,000
Activity in available-for-sale securities:
Sales	205,444,000	10,631,000
Maturities	2,773,665,000	8,270,218,000
Purchases	(3,131,413,000)	(9,972,985,000)
Net increase in loans held-for-investment	(862,636,000)	(110,404,000)
Purchases of bank premises and equipment	(11,970,000)	(14,282,000)
Proceeds from sale of bank premises and equipment and other assets	1,186,000	785,000
Net cash used in investing activities	(1,025,724,000)	(1,816,037,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in noninterest-bearing deposits	420,562,000	591,708,000
Net increase in interest-bearing deposits	155,068,000	625,592,000
Net increase in borrowings	103,429,000	218,586,000
Common stock transactions:
Proceeds from stock option exercises	5,974,000	4,673,000
Dividends paid	(67,072,000)	(58,334,000)
Repuchase of stock	(9,449,000)	0
Net cash provided by financing activities	608,512,000	1,382,225,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(162,806,000)	(167,942,000)
CASH AND CASH EQUIVALENTS, beginning of period	528,588,000	729,084,000
CASH AND CASH EQUIVALENTS, end of period	365,782,000	561,142,000
SUPPLEMENTAL INFORMATION AND NONCASH TRANSACTIONS:
Interest paid	14,067,000	4,938,000
Federal income taxes paid	33,050,000	31,073,000
Transfer of loans to other real estate	0	296,000
Investment securities purchased but not settled	0	174,236,000
Restricted stock grant (forfeiture)	$ 1,681,000	$ (165,000)

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2022
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 78 locations located in Texas as of September 30, 2022 . The Company’s subsidiary bank is First Financial Bank, N.A. 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, N.A. is located. In addition, the Company also owns First Financial Trust & Asset Management Company, N.A., First Financial Insurance Agency, Inc., First Technology Services, Inc. and FB Investment Paris Fund, LLC. 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 in Preparation of Financial Statements 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. 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. Subsequent to July 27, 2021 and through September 30, 2022, 244,559 shares were repurchased and retired at an average price of $ 38.61 . Other Recently Issued and Effective Authoritative Accounting Guidance ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” ASU 2019-12, simplifies the accounting for income taxes by eliminating certain exceptions related to the approach for intra-period tax aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. ASU 2019-12 was effective for the Company for annual reporting periods after December 15, 2020, and interim periods within. Adoption of ASU 2019-12 did not have a significant impact on the Company’s financial statements and related disclosures. 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 generally can be applied through December 31, 2022. 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 generally can be applied through December 31, 2022. 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 will become 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 is not expected to have a significant impact on our financial statements. Investment Securities Management classifies debt securities as held-to-maturity, available-for-sale, or trading based on its intent. Securities that management has the positive intent and ability to hold to maturity are classified as held-to-maturity and recorded at amortized cost, adjusted for amortization of premiums and accretion of discounts, which are recognized as adjustments to interest income using the interest method. Securities not classified as held-to-maturity or trading are classified as available-for-sale and recorded at fair value, with unrealized holding gains and losses (those for which no allowance for credit losses are recorded) reported as a component of other comprehensive income, net of tax. Management determines the appropriate classification of securities at the time of purchase. Interest income includes amortization of purchase premiums and discounts over the period to maturity using a level-yield method, except for premiums on callable securities, which are amortized to their earliest call date. Realized gains and losses are recorded on the sale of securities in noninterest income. The Company has made a policy election to exclude accrued interest from the amortized cost basis of securities and report accrued interest separately in other assets on the consolidated balance sheets. A security is placed on nonaccrual status at the time any principal or interest payments become more than 90 days delinquent or if full collection of interest or principal becomes uncertain. Accrued interest for a security placed on nonaccrual is reversed against interest income. There was no accrued interest related to securities reversed against interest income for the three and nine-months ended September 30, 2022 and 2021. 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 it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, any previously recognized allowances are charged-off and the security’s amortized cost basis is written down to fair value through income as a provision for credit losses. For available-for-sale securities that do not meet the aforementioned criteria, we evaluate whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Management has made the accounting policy election to exclude accrued interest receivable on available-for-sale securities from the estimate of credit losses. Changes in the allowance for credit losses are recorded as provision for (or reversal of) credit losses. Available-for-sale securities are charged-off against the allowance or, in the absence of any allowance, written down through income when deemed uncollectible by management or when either of the aforementioned criteria regarding intent or requirement to sell is met. At September 30, 2022 and 2021, and December 31, 2021 , no allowance for credit losses - available-for-sale securities was recorded. Allowance for Credit Losses – Held-to-Maturity Securities The allowance for credit losses on held-to-maturity securities is a contra-asset valuation account, calculated in accordance with ASC 326, that is deducted from the amortized cost basis of held-to-maturity securities to present management’s best estimate of the net amount expected to be collected. Held-to-maturity securities are charged-off against the allowance when deemed uncollectible by management. Adjustments to the allowance are reported in our income statement as a component of credit loss expense. Management measures expected credit losses on held-to-maturity securities on a collective basis by major security type with each type sharing similar risk characteristics and considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. Management has made the accounting policy election to exclude accrued interest receivable on held-to-maturity securities from the estimate of credit losses. At September 30, 2022 and 2021, and December 31, 2021 , 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 troubled-debt restructurings 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. Upon the adoption of ASC 326, 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 that consider concentrations of the loan portfolio, expected changes to the economic forecasts, large relationships, early delinquencies, and factors related to credit administrations, including, among others, loan-to-value ratios, borrowers’ risk rating and credit score migrations; 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 Commercial and Industrial (“C&I”), Municipal, Agricultural, Construction and Development, Farm, Non-Owner Occupied and Owner Occupied Commercial Real Estate (“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 or decrease management’s estimate of expected credit losses by a calculated percentage or amount based upon the estimated level of risk. The various risks that may be considered in making Q-Factor adjustments include, among other things, the impact of (i) changes in lending policies and procedures, including changes in underwriting standards and practices for collections, write-offs, and recoveries, (ii) actual and expected changes in national, regional, and local economic and business conditions and developments that affect the collectability of the loan pools, (iii) changes in the nature, volume and size of a loan or the loan pools and in the terms of the underlying loans, (iv) changes in the experience, ability, and depth of our lending management and staff, (v) changes in volume and severity of past due financial assets, the volume of nonaccrual assets, and the volume and severity of adversely classified or graded assets, (vi) changes in the quality of our credit review function, (vii) changes in the value of the underlying collateral for loans that are non-collateral dependent, (viii) the existence, growth, and effect of any concentrations of credit and (ix) other factors such as the regulatory, legal and technological environments, competition, and events such as natural disasters or health pandemics. Management believes it uses relevant information available to make determinations about the allowance and that it has established the existing allowance in accordance with GAAP. However, the determination of the allowance requires significant judgment, and estimates of expected lifetime losses in the loan portfolio can vary significantly from the amounts actually observed. While management uses available information to recognize expected losses, future additions to the allowance may be necessary based on changes in the loans comprising the portfolio, changes in the current and forecasted economic conditions, changes to the interest rate environment which may directly impact prepayment and curtailment rate assumptions, and changes in the financial condition of borrowers. Allowance for Credit Losses - Off-Balance-Sheet/Reserve for Unfunded Commitments The allowance for credit losses on off-balance-sheet credit exposures is a liability account, calculated in accordance with ASC 326, representing expected credit losses over the contractual period for which we are exposed to credit risk resulting from a contractual obligation to extend credit. These obligations include unfunded lines of credit, commitments to extend credit and federal funds sold to correspondent banks and standby letters of credit. No allowance is recognized if we have the unconditional right to cancel the obligation. The allowance is reported as a component of accrued interest payable and other liabilities in our consolidated balance sheets. Adjustments to the allowance are reported in our income statement as a component of the provision for credit losses. At September 30, 2022 and 2021, and December 31, 2021, the Company’s reserve for unfunded commitments totaled $ 10,879,000 , $ 6,751,000 and $ 6,436,000 , 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. 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 allowance for credit losses. 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 for the three or nine-months ended September 30, 2022 or 2021 , 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 gains or losses on the Company’s available-for-sale securities, net of applicable income taxes, totaling $ 632,421,000 of losses at September 30, 2022 and $ 109,447,000 and $ 99,253,000 of gains at September 30, 2021 and December 31, 2021 , 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 of September 30, 2022, deferred tax assets totaled $ 168,398,000 and were included in other assets on the consolidated balance sheets. As of September 30, 2021, and December 31, 2021, deferred tax liabilities totaled $ 27,524,000 and $ 24,817,000 , respectively, and were included in other liabilities on the consolidated balance sheets. 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 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/or performance metrics over a three-year period related to a defined group of peers. 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. See Note 8 for further information. Advertising Costs Advertising costs are expensed as incurred. 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 reflected by application of the tre

Securities

Securities	9 Months Ended
	Sep. 30, 2022
Cash and Cash Equivalents [Abstract]
Securities	Note 2 - Securities Debt securities have been classified in the consolidated balance sheets according to management’s intent. The amortized cost, related gross unrealized gains and losses, allowance for credit losses and the fair value of available-for-sale securities are as follows (dollars in thousands): September 30, 2022 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 504,457 $ 2 $ ( 27,283 ) $ 477,176 Obligations of states and political subdivisions 2,368,605 514 ( 285,307 ) 2,083,812 Residential mortgage-backed securities 3,153,864 14 ( 456,997 ) 2,696,881 Commercial mortgage-backed securities 406,530 1 ( 19,185 ) 387,346 Corporate bonds and other 113,015 — ( 12,787 ) 100,228 Total securities available-for-sale $ 6,546,471 $ 531 $ ( 801,559 ) $ 5,745,443 September 30, 2021 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: Obligations of states and political subdivisions $ 2,568,224 $ 103,646 $ ( 6,503 ) $ 2,665,367 Residential mortgage-backed securities 2,999,369 35,950 ( 7,170 ) 3,028,149 Commercial mortgage-backed securities 375,614 13,402 — 389,016 Corporate bonds and other 38,167 70 ( 785 ) 37,452 Total securities available-for-sale $ 5,981,374 $ 153,068 $ ( 14,458 ) $ 6,119,984 December 31, 2021 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 126,716 $ 125 $ — $ 126,841 Obligations of states and political subdivisions 2,638,369 116,319 ( 1,217 ) 2,753,471 Residential mortgage-backed securities 3,256,746 23,990 ( 21,287 ) 3,259,449 Commercial mortgage-backed securities 356,207 8,914 ( 1 ) 365,120 Corporate bonds and other 69,472 32 ( 1,206 ) 68,298 Total securities available-for-sale $ 6,447,510 $ 149,380 $ ( 23,711 ) $ 6,573,179 The Company did no t hold any securities classified as held-to-maturity at September 30, 2022, September 30, 2021, or December 31, 2021. The Company invests in mortgage-backed securities that have expected maturities that differ from their contractual maturities. These differences arise because borrowers may have the right to call or prepay obligations with or without a prepayment penalty. These securities include collateralized mortgage obligations (CMOs) and other asset backed securities. The expected maturities of these securities at September 30, 2022 and 2021, and December 31, 2021, 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 September 30, 2022, by contractual and expected maturity, are shown below (dollars in thousands): Amortized Estimated Cost Basis Fair Value Due within one year $ 239,974 $ 238,511 Due after one year through five years 2,213,010 2,056,408 Due after five years through ten years 2,394,729 2,051,847 Due after ten years 1,698,758 1,398,677 Total $ 6,546,471 $ 5,745,443 The following tables disclose as of September 30, 2022 and 2021, and December 31, 2021 , the Company’s investment securities that have been in a continuous unrealized-loss position for less than 12 months and for 12 or more months (dollars in thousands): Less than 12 Months 12 Months or Longer Total September 30, 2022 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 476,696 $ 27,283 $ — $ — $ 476,696 $ 27,283 Obligations of states and political subdivisions 1,828,105 254,212 139,732 31,095 1,967,837 285,307 Residential mortgage-backed securities 1,507,121 231,915 1,187,815 225,082 2,694,936 456,997 Commercial mortgage-backed securities 386,479 19,185 — — 386,479 19,185 Corporate bonds and other 59,782 4,544 40,446 8,243 100,228 12,787 Total $ 4,258,183 $ 537,139 $ 1,367,993 $ 264,420 $ 5,626,176 $ 801,559 Less than 12 Months 12 Months or Longer Total September 30, 2021 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Obligations of states and political subdivisions $ 570,916 $ 6,036 $ 18,711 $ 467 $ 589,627 $ 6,503 Residential mortgage-backed securities 1,208,129 7,166 2,051 4 1,210,180 7,170 Corporate bonds and other 32,985 785 — — 32,985 785 Total $ 1,812,030 $ 13,987 $ 20,762 $ 471 $ 1,832,792 $ 14,458 Less than 12 Months 12 Months or Longer Total December 31, 2021 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Obligations of states and political subdivisions $ 163,698 $ 1,096 $ 18,943 $ 122 $ 182,641 $ 1,218 Residential mortgage-backed securities 2,263,010 19,742 54,392 1,544 2,317,402 21,286 Commercial mortgage-backed securities 820 1 — — 820 1 Corporate bonds and other 47,436 635 16,432 571 63,868 1,206 Total $ 2,474,964 $ 21,474 $ 89,767 $ 2,237 $ 2,564,731 $ 23,711 The number of investments in an unrealized loss position totaled 1,115 at September 30, 2022. We believe any unrealized losses in the U.S. treasury securities, obligations of state and political subdivisions, residential and commercial mortgage-backed and asset-backed investment securities, and corporate bonds and other at September 30, 2022 and 2021, and December 31, 2021, are due to changes in interest rates and not credit-related events. As such, no allowance for credit losses is required on these securities at September 30, 2022 and 2021, and December 31, 2021. 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 September 30, 2022, 72.44 % of our available-for-sale securities that are obligations of states and political subdivisions were issued within the State of Texas, of which 55.16 % are guaranteed by the Texas Permanent School Fund. At September 30, 2022, $ 3,447,317,000 of the Company’s securities were pledged, at fair value, as collateral for public or trust fund deposits, repurchase agreements, borrowings and for other purposes required or permitted by law. During the three-months ended September 30, 2022, there were $ 17,081,000 of sales of investment securities that were classified as available-for-sale. During the three-months ended September 30, 2021, there were calls of investment securities that were classified as available-for-sale. Gross realized security gains from sales and calls during the third quarters of 2022 and 2021 totaled $ 334,000 and $ 1,000 , respectively. There were no gross realized security losses from sales or calls during the third quarter of 2022 or 2021, respectively. During the nine-months ended September 30, 2022 and 2021, sales of investment securities that were classified as available-for-sale totaled $ 205,444,000 and $ 10,631,000 , respectively. Gross realized security gains from sales and calls during the nine-months ended September 30, 2022 and 2021 totaled $ 4,357,000 and $ 814,000 , respectively. Gross realized security losses from sales and calls during the nine-months ended September 30, 2022 totaled $ 2,344,000 with no gross realized security losses from sales or calls during the nine-months ended September 30, 2021. The specific identification method was used to determine 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	9 Months Ended
	Sep. 30, 2022
Receivables [Abstract]
Loans Held for Investment and Allowance for Credit Losses	Note 3 – Loans Held-for-Investment and Allowance for Credit Losses For the periods ended September 30, 2022 and 2021, and December 31, 2021, the following tables outline the Company’s loan portfolio by the ten portfolio segments where applicable. Loans held-for-investment by portfolio segment are as follows (dollars in thousands): September 30, December 31, 2022 2021 2021 Commercial: C&I* $ 871,335 $ 819,597 $ 837,075 Municipal 214,852 165,847 177,905 Total Commercial 1,086,187 985,444 1,014,980 Agricultural 76,937 98,947 98,089 Real Estate: Construction & Development 938,051 656,530 749,793 Farm 268,139 203,064 217,220 Non-Owner Occupied CRE 717,738 674,958 623,434 Owner Occupied CRE 945,665 824,231 821,653 Residential 1,536,180 1,328,798 1,334,419 Total Real Estate 4,405,773 3,687,581 3,746,519 Consumer: Auto 538,798 394,072 405,416 Non-Auto 147,793 120,450 123,968 Total Consumer 686,591 514,522 529,384 Total Loans 6,255,488 5,286,494 5,388,972 Less: Allowance for credit losses ( 74,108 ) ( 63,370 ) ( 63,465 ) Loans, net $ 6,181,380 $ 5,223,124 $ 5,325,507 * All disclosures for the C&I loan segment include PPP loan balances, net of deferred fees and costs, as disclosed on the face of the consolidated balance sheet. Outstanding loan balances at September 30, 2022 and 2021, and December 31, 2021, are net of unearned income, including net deferred loan fees. Our subsidiary bank has established a line of credit with the Federal Home Loan Bank of Dallas (“FHLB”) to provide liquidity and meet pledging requirements for those customers eligible to have securities pledged to secure certain uninsured deposits. At September 30, 2022, this available line of credit was $ 2,258,125,000 . At September 30, 2022, $ 3,901,376,000 in loans held by our bank subsidiary were subject to blanket liens as security for this line of credit. At September 30, 2022 , there was no balance outstanding under this line of credit. The Company’s nonaccrual loans, loans still accruing and past due 90 days or more and restructured loans are as follows (dollars in thousands): September 30, December 31, 2022 2021 2021 Nonaccrual loans $ 24,585 $ 25,210 $ 31,652 Loans still accruing and past due 90 days or more 15 23 8 Troubled debt restructured loans still accruing* 19 22 21 Total $ 24,619 $ 25,255 $ 31,681 * Troubled debt restructured loans of $ 1,951,000 , $ 4,732,000 and $ 6,721,000 , for which interest collection is doubtful are included in nonaccrual loans as of September 30, 2022 and 2021, and December 31, 2021 , respectively. The Company ha d $ 24,619,000 , $ 25,283,000 and $ 34,158,000 in nonaccrual, past due 90 days or more and still accruing, restructured loans, and foreclosed assets at September 30, 2022 and 2021, and December 31, 2021 , respectively. Nonaccrual loans at September 30, 2022 and 2021, and December 31, 2021, consisted of the following (dollars in thousands): September 30, December 31, 2022 2021 2021 Commercial: C&I $ 5,966 $ 3,430 $ 5,370 Municipal — — — Total Commercial 5,966 3,430 5,370 Agricultural 338 949 4,920 Real Estate: Construction & Development 1,696 1,455 708 Farm 91 965 1,173 Non-Owner Occupied CRE 2,406 2,776 2,671 Owner Occupied CRE 6,703 6,551 7,897 Residential 6,762 8,399 8,360 Total Real Estate 17,658 20,146 20,809 Consumer: Auto 596 589 514 Non-Auto 27 96 39 Total Consumer 623 685 553 Total $ 24,585 $ 25,210 $ 31,652 No significant additional funds are committed to be advanced in connection with nonaccrual loans as of September 30, 2022. Summary information on the allowance for credit losses for the three and nine-months ended September 30, 2022 and 2021, are outlined by portfolio segment in the following tables (dollars in thousands): Three-Months Ended September 30, 2022 C&I Municipal Agricultural Construction Farm Beginning balance $ 18,589 $ 1,352 $ 1,162 $ 21,085 $ 1,006 Provision for loan losses ( 2,378 ) ( 33 ) ( 187 ) 4,614 149 Recoveries 266 — 18 — — Charge-offs ( 38 ) — — — — Ending balance $ 16,439 $ 1,319 $ 993 $ 25,699 $ 1,155 Three-Months Ended September 30, 2022 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 8,410 $ 10,740 $ 8,304 $ 912 $ 372 $ 71,932 Provision for loan losses ( 498 ) ( 1,303 ) 557 72 67 1,060 Recoveries 283 649 93 47 53 1,409 Charge-offs — — — ( 119 ) ( 136 ) ( 293 ) Ending balance $ 8,195 $ 10,086 $ 8,954 $ 912 $ 356 $ 74,108 Nine-Months Ended September 30, 2022 C&I Municipal Agricultural Construction Farm Beginning balance $ 12,280 $ 348 $ 1,597 $ 17,627 $ 663 Provision for loan losses 3,598 971 ( 730 ) 8,172 492 Recoveries 824 — 135 — — Charge-offs ( 263 ) — ( 9 ) ( 100 ) — Ending balance $ 16,439 $ 1,319 $ 993 $ 25,699 $ 1,155 Nine-Months Ended September 30, 2022 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 10,722 $ 10,828 $ 8,133 $ 896 $ 371 $ 63,465 Provision for loan losses ( 3,352 ) ( 1,323 ) 860 116 106 8,910 Recoveries 825 669 110 215 182 2,960 Charge-offs — ( 88 ) ( 149 ) ( 315 ) ( 303 ) ( 1,227 ) Ending balance $ 8,195 $ 10,086 $ 8,954 $ 912 $ 356 $ 74,108 Three-Months Ended September 30, 2021 C&I Municipal Agricultural Construction Farm Beginning balance $ 10,186 $ 588 $ 1,312 $ 15,632 $ 607 Provision for loan losses ( 31 ) ( 273 ) 1,022 1,230 ( 21 ) Recoveries 1,140 — 5 — — Charge-offs ( 902 ) — ( 50 ) — — Ending balance $ 10,393 $ 315 $ 2,289 $ 16,862 $ 586 Three-Months Ended September 30, 2021 (continued) Non-Owner Owner Residential Auto Non- Total Beginning balance $ 10,432 $ 10,399 $ 11,234 $ 1,266 $ 482 $ 62,138 Provision for loan losses ( 344 ) ( 94 ) ( 1,184 ) ( 259 ) ( 46 ) — Recoveries 556 806 7 129 64 2,707 Charge-offs — ( 222 ) — ( 176 ) ( 125 ) ( 1,475 ) Ending balance $ 10,644 $ 10,889 $ 10,057 $ 960 $ 375 $ 63,370 Nine-Months Ended September 30, 2021 C&I Municipal Agricultural Construction Farm Beginning balance $ 13,609 $ 1,552 $ 1,255 $ 13,512 $ 1,876 Provision for loan losses ( 3,597 ) ( 1,237 ) 1,076 3,348 ( 1,300 ) Recoveries 1,671 — 29 2 10 Charge-offs ( 1,290 ) — ( 71 ) — — Ending balance $ 10,393 $ 315 $ 2,289 $ 16,862 $ 586 Nine-Months Ended September 30, 2021 (continued) Non-Owner Owner Residential Auto Non- Total Beginning balance $ 8,391 $ 12,347 $ 12,601 $ 1,020 $ 371 $ 66,534 Provision for loan losses 1,609 ( 2,044 ) ( 2,542 ) 139 80 ( 4,468 ) Recoveries 650 816 90 305 172 3,745 Charge-offs ( 6 ) ( 230 ) ( 92 ) ( 504 ) ( 248 ) ( 2,441 ) Ending balance $ 10,644 $ 10,889 $ 10,057 $ 960 $ 375 $ 63,370 Additionally, the Company records a reserve for unfunded commitments in other liabilities which totaled $ 10,879,000 , $ 6,751,000 and $ 6,436,000 at September 30, 2022 and 2021, and December 31, 2021, respectively. The provision for loan losses of $ 1,060,000 for the three-months ended September 30, 2022 is combined with the provision for unfunded commitments of $ 2,161,000 and reported in the aggregate of $ 3,221,000 under the provision for credit losses in the consolidated statement of earnings for the three-months ended September 30, 2022. The provision for loan losses of $ 8,910,000 for the nine-months ended September 30, 2022 above is combined with the provision for unfunded commitments of $ 4,443,000 and reported in the aggregate of $ 13,353,000 under the provision for credit losses in the consolidated statement of earnings for the nine-months ended September 30, 2022. There was no provision for loan losses or unfunded commitments for the three-months ended September 30, 2021. The $ 4,468,000 reversal of the provision for loan losses for the nine-months ended September 30, 2021 above is combined with the provision for unfunded commitments of $ 1,265,000 and reported in the net aggregate reversal of $ 3,203,000 under the provision for credit losses for the nine-months ended September 30, 2021. The Company’s loans that are ind ividually evaluated for credit losses (both collateral and non-collateral dependent) and their related allowances as of September 30, 2022 and 2021, and December 31, 2021, are summarized in the following tables by loan segment (dollars in thousands): September 30, 2022 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 334 $ 5,632 $ 20,844 $ 26,810 $ 4,094 $ 4,345 $ 8,439 Municipal — — 71 71 — — — Total Commercial 334 5,632 20,915 26,881 4,094 4,345 8,439 Agricultural 116 222 412 750 103 247 350 Real Estate: Construction & Development 919 777 5,461 7,157 207 384 591 Farm — 91 1,616 1,707 2 39 41 Non-Owner Occupied CRE 2,230 176 32,959 35,365 12 2,317 2,329 Owner Occupied CRE 5,700 1,003 30,136 36,839 103 1,958 2,061 Residential 4,129 2,633 26,076 32,838 293 1,347 1,640 Total Real Estate 12,978 4,680 96,248 113,906 617 6,045 6,662 Consumer: Auto — 596 1,096 1,692 1 2 3 Non-Auto — 27 461 488 — 1 1 Total Consumer — 623 1,557 2,180 1 3 4 Total $ 13,428 $ 11,157 $ 119,132 $ 143,717 $ 4,815 $ 10,640 $ 15,455 September 30, 2021 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 1,311 $ 2,119 $ 18,713 $ 22,143 $ 610 $ 3,296 $ 3,906 Municipal — — 121 121 — — — Total Commercial 1,311 2,119 18,834 22,264 610 3,296 3,906 Agricultural 328 621 6,944 7,893 184 1,965 2,149 Real Estate: Construction & Development 1,225 230 4,872 6,327 6 158 164 Farm 878 87 2,140 3,105 — 6 6 Non-Owner Occupied CRE 2,629 147 33,382 36,158 16 3,959 3,975 Owner Occupied CRE 5,886 665 42,781 49,332 99 3,382 3,481 Residential 3,634 4,765 30,090 38,489 641 2,022 2,663 Total Real Estate 14,252 5,894 113,265 133,411 762 9,527 10,289 Consumer: Auto — 589 1,181 1,770 2 2 4 Non-Auto — 96 337 433 — 2 2 Total Consumer — 685 1,518 2,203 2 4 6 Total $ 15,891 $ 9,319 $ 140,561 $ 165,771 $ 1,558 $ 14,792 $ 16,350 December 31, 2021 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 749 $ 4,621 $ 19,021 $ 24,391 $ 2,533 $ 4,094 $ 6,627 Municipal — — 109 109 — — — Total Commercial 749 4,621 19,130 24,500 2,533 4,094 6,627 Agricultural 3,026 1,894 478 5,398 1,086 359 1,445 Real Estate: Construction & Development 102 606 4,765 5,473 90 135 225 Farm 997 176 1,969 3,142 — 2 2 Non-Owner Occupied CRE 2,543 128 31,797 34,468 15 4,044 4,059 Owner Occupied CRE 6,548 1,349 40,607 48,504 152 3,329 3,481 Residential 5,990 2,370 29,210 37,570 307 1,719 2,026 Total Real Estate 16,180 4,629 108,348 129,157 564 9,229 9,793 Consumer: Auto — 514 1,161 1,675 1 3 4 Non-Auto — 39 416 455 — 1 1 Total Consumer — 553 1,577 2,130 1 4 5 Total $ 19,955 $ 11,697 $ 129,533 $ 161,185 $ 4,184 $ 13,686 $ 17,870 The Company’s allowance for loans that are individually evaluated for credit losses and collectively evaluated for credit losses as of September 30, 2022 and 2021, and December 31, 2021, are summarized in the following table by loan segment (dollars in thousands). Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. September 30, 2022 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 8,439 $ — $ 350 $ 591 $ 41 Loans collectively evaluated for credit losses 8,000 1,319 643 25,108 1,114 Total $ 16,439 $ 1,319 $ 993 $ 25,699 $ 1,155 September 30, 2022 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 2,329 $ 2,061 $ 1,640 $ 3 $ 1 $ 15,455 Loans collectively evaluated for credit losses 5,866 8,025 7,314 909 355 58,653 Total $ 8,195 $ 10,086 $ 8,954 $ 912 $ 356 $ 74,108 September 30, 2021 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 3,906 $ — $ 2,149 $ 164 $ 6 Loans collectively evaluated for credit losses 6,487 315 140 16,698 580 Total $ 10,393 $ 315 $ 2,289 $ 16,862 $ 586 September 30, 2021 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,975 $ 3,481 $ 2,663 $ 4 $ 2 $ 16,350 Loans collectively evaluated for credit losses 6,669 7,408 7,394 956 373 47,020 Total $ 10,644 $ 10,889 $ 10,057 $ 960 $ 375 $ 63,370 December 31, 2021 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 6,627 $ — $ 1,445 $ 225 $ 2 Loans collectively evaluated for credit losses 5,653 348 152 17,402 661 Total $ 12,280 $ 348 $ 1,597 $ 17,627 $ 663 December 31, 2021 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 4,059 $ 3,481 $ 2,026 $ 4 $ 1 $ 17,870 Loans collectively evaluated for credit losses 6,663 7,347 6,107 892 370 45,595 Total $ 10,722 $ 10,828 $ 8,133 $ 896 $ 371 $ 63,465 The Company’s recorded investment in loans as of September 30, 2022 and 2021, and December 31, 2021, related to the balance in the allowance for credit losses follows below (dollars in thousands): September 30, 2022 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 26,810 $ 71 $ 750 $ 7,157 $ 1,707 Loans collectively evaluated for credit losses 844,525 214,781 76,187 930,894 266,432 Total $ 871,335 $ 214,852 $ 76,937 $ 938,051 $ 268,139 September 30, 2022 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 35,365 $ 36,839 $ 32,838 $ 1,692 $ 488 $ 143,717 Loans collectively evaluated for credit losses 682,373 908,826 1,503,342 537,106 147,305 6,111,771 Total $ 717,738 $ 945,665 $ 1,536,180 $ 538,798 $ 147,793 $ 6,255,488 September 30, 2021 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 22,143 $ 121 $ 7,893 $ 6,327 $ 3,105 Loans collectively evaluated for credit losses 797,454 165,726 91,054 650,203 199,959 Total $ 819,597 $ 165,847 $ 98,947 $ 656,530 $ 203,064 September 30, 2021 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 36,158 $ 49,332 $ 38,489 $ 1,770 $ 433 $ 165,771 Loans collectively evaluated for credit losses 638,800 774,899 1,290,309 392,302 120,017 5,120,723 Total $ 674,958 $ 824,231 $ 1,328,798 $ 394,072 $ 120,450 $ 5,286,494 December 31, 2021 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 24,391 $ 109 $ 5,398 $ 5,473 $ 3,142 Loans collectively evaluated for credit losses 812,684 177,796 92,691 744,320 214,078 Total $ 837,075 $ 177,905 $ 98,089 $ 749,793 $ 217,220 December 31, 2021 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 34,468 $ 48,504 $ 37,570 $ 1,675 $ 455 $ 161,185 Loans collectively evaluated for credit losses 588,966 773,149 1,296,849 403,741 123,513 5,227,787 Total $ 623,434 $ 821,653 $ 1,334,419 $ 405,416 $ 123,968 $ 5,388,972 From a credit risk standpoint, the Company rates its loans in one of five categories: (i) pass, (ii) special mention, (iii) substandard, (iv) doubtful or (v) loss (which are charged-off). The ratings of loans reflect a judgment about the risks of default and loss associated with the loan. The Company reviews the ratings on our credits as part of our ongoing monitoring of the credit quality of our loan portfolio. Ratings are adjusted to reflect the degree of risk and loss that are felt to be inherent in each credit as of each reporting period. Our methodology is structured so that specific allocations are increased in accordance with deterioration in credit quality (and a corresponding increase in risk and loss) or decreased in accordance with improvement in credit quality (and a corresponding decrease in risk and loss). Credits rated special mention show clear signs of financial weaknesses or deterioration in credit worthiness, however, such concerns are not so pronounced that the Company generally expects to experience significant loss within the short-term. Such credits typically maintain the ability to perform within standard credit terms and credit exposure is not as prominent as credits rated more harshly. Credits rated substandard are those in which the normal repayment of principal and interest may be, or has been, jeopardized by reason of adverse trends or developments of a financial, managerial, economic or political nature, or important weaknesses exist in collateral. A protracted workout on these credits is a distinct possibility. Prompt corrective action is therefore required to strengthen the Company’s position, and/or to reduce exposure and to assure that adequate remedial measures are taken by the borrower. Credit exposure becomes more likely in such credits and a serious evaluation of the secondary support to the credit is performed. Credits rated doubtful are those in which full collection of principal appears highly questionable, and which some degree of loss is anticipated, even though the ultimate amount of loss may not yet be certain and/or other factors exist which could affect collection of debt. Based upon available information, positive action by the Company is required to avert or minimize loss. Credits rated doubtful are generally also placed on nonaccrual. The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at September 30, 2022 (dollars in millions): September 30, 2022 2021 2020 2019 2018 Prior Revolving Total C&I Risk rating: Pass $ 495 $ 226 $ 65 $ 24 $ 18 $ 16 $ — $ 844 Special mention 1 — — 1 — — — 2 Substandard 11 7 3 1 3 — — 25 Doubtful — — — — — — — — Total $ 507 $ 233 $ 68 $ 26 $ 21 $ 16 $ — $ 871 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Municipal Risk rating: Pass $ 67 $ 21 $ 16 $ 5 $ 20 $ 86 $ — $ 215 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 67 $ 21 $ 16 $ 5 $ 20 $ 86 $ — $ 215 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Agricultural Risk rating: Pass $ 46 $ 21 $ 4 $ 3 $ 1 $ 1 $ — $ 76 Special mention — — — — — — — — Substandard — 1 — — — — — 1 Doubtful — — — — — — — — Total $ 46 $ 22 $ 4 $ 3 $ 1 $ 1 $ — $ 77 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Construction & Development Risk rating: Pass $ 504 $ 317 $ 78 $ 15 $ 8 $ 9 $ — $ 931 Special mention — 2 — — — — — 2 Substandard 4 1 — — — — — 5 Doubtful — — — — — — — — Total $ 508 $ 320 $ 78 $ 15 $ 8 $ 9 $ — $ 938 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Farm Risk rating: Pass $ 101 $ 89 $ 33 $ 12 $ 8 $ 23 $ — $ 266 Special mention — — — — — — — — Substandard 1 — — — — 1 — 2 Doubtful — — — — — — — — Total $ 102 $ 89 $ 33 $ 12 $ 8 $ 24 $ — $ 268 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 223 $ 200 $ 108 $ 51 $ 22 $ 79 $ — $ 683 Special mention — 1 — 11 — 7 — 19 Substandard 5 1 1 2 1 6 — 16 Doubtful — — — — — — — — Total $ 228 $ 202 $ 109 $ 64 $ 23 $ 92 $ — $ 718 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 280 $ 223 $ 134 $ 81 $ 67 $ 124 $ — $ 909 Special mention — 1 2 4 — 1 — 8 Substandard 1 2 1 3 11 11 — 29 Doubtful — — — — — — — Total $ 281 $ 226 $ 137 $ 88 $ 78 $ 136 $ — $ 946 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Residential Risk rating: Pass $ 433 $ 382 $ 183 $ 87 $ 68 $ 224 $ 126 $ 1,503 Special mention — 2 3 — — 3 — 8 Substandard 4 3 3 2 1 9 3 25 Doubtful — — — — — — — Total $ 437 $ 387 $ 189 $ 89 $ 69 $ 236 $ 129 $ 1,536 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Auto Risk rating: Pass $ 284 $ 149 $ 64 $ 29 $ 8 $ 3 $ — $ 537 Special mention — — — — — — — — Substandard — — 1 1 — — — 2 Doubtful — — — — — — — Total $ 284 $ 149 $ 65 $ 30 $ 8 $ 3 $ — $ 539 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Non-Auto Risk rating: Pass $ 73 $ 48 $ 13 $ 4 $ 2 $ 1 $ 7 $ 148 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 73 $ 48 $ 13 $ 4 $ 2 $ 1 $ 7 $ 148 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Total Loans Risk rating: Pass $ 2,506 $ 1,676 $ 698 $ 311 $ 222 $ 566 $ 133 $ 6,112 Special mention 1 6 5 16 — 11 — 39 Substandard 26 15 9 9 16 27 3 105 Doubtful — — — — — — — — Total $ 2,533 $ 1,697 $ 712 $ 336 $ 238 $ 604 $ 136 $ 6,256 The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at September 30, 2021 (dollars in millions): September 30, 2021 2020 2019 2018 2017 Prior Revolving Total C&I Risk rating: Pass $ 485 $ 185 $ 62 $ 35 $ 19 $ 12 $ — $ 798 Special mention 2 1 1 1 1 — — 6 Substandard 5 6 2 2 1 — — 16 Doubtful — — — — — — — — Total $ 492 $ 192 $ 65 $ 38 $ 21 $ 12 $ — $ 820 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Municipal Risk rating: Pass $ 22 $ 17 $ 6 $ 22 $ 17 $ 82 $ — $ 166 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 22 $ 17 $ 6 $ 22 $ 17 $ 82 $ — $ 166 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Agricultural Risk rating: Pass $ 51 $ 19 $ 11 $ 6 $ 3 $ 1 $ — $ 91 Special mention — 1 — — — — — 1 Substandard 6 1 — — — — — 7 Doubtful — — — — — — — — Total $ 57 $ 21 $ 11 $ 6 $ 3 $ 1 $ — $ 99 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Construction & Development Risk rating: Pass $ 383 $ 195 $ 37 $ 18 $ 8 $ 8 $ — $ 649 Special mention 3 — — — — — — 3 Substandard 2 1 1 — — — — 4 Doubtful — — — — — — — — Total $ 388 $ 196 $ 38 $ 18 $ 8 $ 8 $ — $ 656 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Farm Risk rating: Pass $ 94 $ 46 $ 16 $ 11 $ 8 $ 25 $ — $ 200 Special mention — — — — — — — — Substandard — 1 — 1 — 1 — 3 Doubtful — — — — — — — — Total $ 94 $ 47 $ 16 $ 12 $ 8 $ 26 $ — $ 203 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 158 $ 156 $ 98 $ 75 $ 35 $ 117 $ — $ 639 Special mention — 1 13 — 7 3 — 24 Substandard 1 — 3 1 3 4 — 12 Doubtful — — — — — — — — Total $ 159 $ 157 $ 114 $ 76 $ 45 $ 124 $ — $ 675 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 193 $ 166 $ 125 $ 99 $ 59 $ 133 $ — $ 775 Special mention 3 — 1 — 1 1 — 6 Substandard 9 3 4 14 3 10 — 43 Doubtful — — — — — — — — Total $ 205 $ 169 $ 130 $ 113 $ 63 $ 144 $ — $ 824 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Residential Risk rating: Pass $ 374 $ 279 $ 126 $ 94 $ 76 $ 245 $ 96 $ 1,290 Special mention 4 4 — 1 1 3 — 13 Substandard 4 3 3 2 2 10 2 26 Doubtful — — — — — — — — Total $ 382 $ 286 $ 129 $ 97 $ 79 $ 258 $ 98 $ 1,329 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Auto Risk rating: Pass $ 174 $ 121 $ 64 $ 21 $ 9 $ 3 $ — $ 392 Special mention — — — — — — — — Substandard — 1 1 — — — — 2 Doubtful — — — — — — — — Total $ 174 $ 122 $ 65 $ 21 $ 9 $ 3 $ — $ 394 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Non-Auto Risk rating: Pass $ 65 $ 27 $ 11 $ 4 $ 2 $ 5 $ 6 $ 120 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 65 $ 27 $ 11 $ 4 $ 2 $ 5 $ 6 $ 120 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Total Loans Risk rating: Pass $ 1,999 $ 1,211 $ 556 $ 385 $ 236 $ 631 $ 102 $ 5,120 Special mention 12 7 15 2 10 7 — 53 Substandard 27 16 14 20 9 25 2 113 Doubtful — — — — — — — — Total $ 2,038 $ 1,234 $ 585 $ 407 $ 255 $ 663 $ 104 $ 5,286 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, 2021 (dollars in millions): December 31, 2021 2020 2019 2018 2017 Prior Revolving Total C&I Risk rating: Pass $ 526 $ 178 $ 52 $ 29 $ 17 $ 11 $ — $ 813 Special mention 4 1 4 — — — — 9 Substandard 7 4 1 3 — — — 15 Doubtful — — — — — — — — Total $ 537 $ 183 $ 57 $ 32 $ 17 $ 11 $ — $ 837 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Municipal Risk rating: Pass $ 39 $ 15 $ 6 $ 22 $ 17 $ 79 $ — $ 178 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 39 $ 15 $ 6 $ 22 $ 17 $ 79 $ — $ 178 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Agricultural Risk rating: Pass $ 69 $ 8 $ 6 $ 6 $ 3 $ 1 $ — $ 93 Special mention — — — — — — — — Substandard 4 1 — — — — — 5 Doubtful — — — — — — — — Total $ 73 $ 9 $ 6 $ 6 $ 3 $ 1 $ — $ 98 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Construction & Development Risk rating: Pass $ 557 $ 134 $ 24 $ 14 $ 7 $ 8 $ — $ 744 Special mention 2 — — — — — — 2 Substandard 2 2 — — — — — 4 Doubtful — — — — — — — — Total $ 561 $ 136 $ 24 $ 14 $ 7 $ 8 $ — $ 750 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Farm Risk rating: Pass $ 117 $ 42 $ 15 $ 10 $ 7 $ 23 $ — $ 214 Special mention — — — — — — — — Substandard 1 1 — 1 — — — 3 Doubtful — — — — — — — — Total $ 118 $ 43 $ 15 $ 11 $ 7 $ 23 $ — $ 217 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 214 $ 128 $ 77 $ 56 $ 31 $ 84 $ — $ 590 Special mention — 1 12 — 7 3 — 23 Substandard — 1 3 1 3 3 — 11 Doubtful — — — — — — — — Total $ 214 $ 130 $ 92 $ 57 $ 41 $ 90 $ — $ 624 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 250 $ 143 $ 114 $ 90 $ 59 $ 117 $ — $ 773 Special mention 2 2 1 — 1 1 — 7 Substandard 8 2 3 13 5 11 — 42 Doubtful — — — — — — — — Total $ 260 $ 147 $ 118 $ 103 $ 65 $ 129 $ — $ 822 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Residential Risk rating: Pass $ 477 $ 230 $ 115 $ 84 $ 68 $ 222 $ 100 $ 1,296 Special mention 3 4 — 1 1 3 1 13 Substandard 3 3 3 2 2 10 2 25 Doubtful — — — — — — — — Total $ 483 $ 237 $ 118 $ 87 $ 71 $ 235 $ 103 $ 1,334 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Auto Risk rating: Pass $ 218 $ 105 $ 54 $ 17 $ 7 $ 2 $ — $ 403 Special mention 1 — — — — — — 1 Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 219 $ 105 $ 55 $ 17 $ 7 $ 2 $ — $ 405 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Non-Auto Risk rating: Pass $ 81 $ 22 $ 8 $ 4 $ 1 $ 1 $ 7 $ 124 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 81 $ 22 $ 8 $ 4 $ 1 $ 1 $ 7 $ 124 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Total Loans Risk rating: Pass $ 2,548 $ 1,005 $ 471 $ 332 $ 217 $ 548 $ 107 $ 5,228 Special mention 12 8 17 1 9 7 1 55 Substandard 25 14 11 20 10 24 2 106 Doubtful — — — — — — — — Total $ 2,585 $ 1,027 $ 499 $ 353 $ 236 $ 579 $ 110 $ 5,389 At September 30, 2022 and 2021, and December 31, 2021, the Company’s past due loans are as follows (dollars in thousands): September 30, 2022 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 5,422 $ 73 $ 1,515 $ 7,010 $ 864,325 $ 871,335 $ — Municipal — — — — 214,852 214,852 — Total Commercial 5,422 73 1,515 7,010 1,079,177 1,086,187 — Agricultural 290 93 — 383 76,554 76,937 — Real Estate: Construction & Development 2,958 600 — 3,558 934,493 938,051 — Farm 822 150 — 972 267,167 268,139 — Non-Owner Occupied CRE 536 — — 536 717,202 717,738 — Owner Occupied CRE 1,138 37 — 1,175 944,490 945,665 — Residential 4,834 252 15 5,101 1,531,079 1,536,180 15 Total Real Estate 10,288 1,039 15 11,342 4,394,431 4,405,773 15 Consumer: Auto 267 76 33 376 538,422 538,798 — Non-Auto 66 10 — 76 147,717 147,793 — Total Consumer 333 86 33 452 686,139 686,591 — Total $ 16,333 $ 1,291 $ 1,563 $ 19,187 $ 6,236,301 $ 6,255,488 $ 15 September 30, 2021 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 4,136 $ 516 $ 666 $ 5,318 $ 814,279 $ 819,597 $ 23 Municipal — — — — 165,847 165,847 — Total Commercial 4,136 516 666 5,318 980,126 985,444 23 Agricultural 115 1,074 100 1,289 97,658 98,947 — Real Estate: Construction & Development 4,676 — 114 4,790 651,740 656,530 — Farm 1,182 13 — 1,195 201,869 203,064 — Non-Owner Occupied CRE 800 — — 800 674,158 674,958 — Owner Occupied CRE 260 315 1,537 2,112 822,119 824,231 — Residential 7,807 475 415 8,697 1,320,101 1,328,798 — Total Real Estate 14,725 803 2,066 17,594 3,669,987 3,687,581 — Consumer: Auto 323 43 7 373 393,699 394,072 — Non-Auto 59 3 — 62 120,388 120,450 — Total Consumer 382 46 7 435 514,087 514,522 — Total $ 19,358 $ 2,439 $ 2,839 $ 24,636 $ 5,261,858 $ 5,286,494 $ 23 December 31, 2021 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 3,638 $ 34 $ 222 $ 3,894 $ 833,181 $ 837,075 $ 5 Municipal 63 — — 63 177,842 177,905 — Total Commercial 3,701 34 222 3,957 1,011,023 1,014,980 5 Agricultural 181 — — 181 97,908 98,089 — Real Estate: Construction & Development 2,953 39 — 2,992 746,801 749,793 — Farm 600 215 — 815 216,405 217,220 — Non-Owner Occupied CRE 235 — — 235 623,199 623,434 — Owner Occupied CRE 813 — 280 1,093 820,560 821,653 — Residential 4,984 327 410 5,721 1,328,698 1,334,419 — Total Real Estate 9,585 581 690 10,856 3,735,663 3,746,519 — Consumer: Auto 393 26 — 419 404,997 405,416 — Non-Auto 145 24 3 172 123,796 123,968 3 Total Consumer 538 50 3 591 528,793 529,384 3 Total $ 14,005 $ 665 $ 915 $ 15,585 $ 5,373,387 $ 5,388,972 $ 8 * 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. The restructuring of a loan is considered a “troubled debt restructuring” if both the borrower is experiencing financial difficulties and the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, principal forgiveness, restructuring amortization schedules, reductions in collateral and other actions intended to minimize potential losses. The Company's loans that were modified and considered troubled debt restructurings are as follows (dollars in thousands): Three-Months Ended September 30, 2022 Nine-Months Ended September 30, 2022 Pre- Post- Pre- Post- Recorded Recorded Recorded Recorded Number Investment Investment Number Investment Investment Commercial: C&I 1 $ 205 $ 205 1 $ 205 $ 205 Municipal — — — — — — Total Commercial 1 205 205 1 205 205 Agricultural — — — — — — Real Estate: Construction & Development — — — — — — Farm — — — — — — Non-Owner Occupied CRE — — — — — — Owner Occupied CRE — — — — — — Residential 1 130 130 1 130 130 Total Real Estate 1 130 130 1 130 130 Consumer: Auto — — — Non-Auto — — — Total Consumer — — — — — — Total 2 $ 335 $ 335 2 $ 335 $ 335 Three-Months Ended September 30, 2021 Nine-Months Ended September 30, 2021 Pre- Post- Pre- Post- Recorded Recorded Recorded Recorded Number Investment Investment Number Investment Investment Commercial: C&I — $ — $ — 4 $ 361 $ 361 Municipal — — — — — — Total Commercial — — — 4 361 361 Agricultural — — — 1 68 68 Real Estate: Construction & Development — — — 1 200 200 Farm — — — — — — Non-Owner Occupied CRE — — — — — — Owner Occupied CRE — — — 3 1,047 1,047 Residential 2 77 77 5 519 519 Total Real Estate 2 77 77 9 1,766 1,766 Consumer: Auto 1 19 19 2 51 51 Non-Auto 1 9 9 1 9 9 Total Consumer 2 28 28 3 60 60 Total 4 $ 105 $ 105 17 $ 2,255 $ 2,255 The balances below provide information as to how the loans were modified as troubled debt restructured loans (dollars in thousands): Three-Months Ended September 30, 2022 Nine-Months Ended September 30, 2022 Adjusted Combined Adjusted Combined Interest Maturity Rate and Interest Maturity Rate and Rate Extended Maturity Rate Extended Maturity Commercial: C&I $ — $ — $ 205 $ — $ — $ 205 Municipal — — — — — — Total Commercial — — 205 — — 205 Agricultural — — — — — — Real Estate: Construction & Development — — — — — — Farm — — — — — — Non-Owner Occupied CRE — — — — — — Owner Occupied CRE — — — — — — Residential — — 130 — — 130 Total Real Estate — — 130 — — 130 Consumer: Auto — — — — — — Non-Auto — — — — — — Total Consumer — — — — — — Total $ — $ — $ 335 $ — $ — $ 335 Three-Months Ended September 30, 2021 Nine-Months Ended September 30, 2021 Adjusted Combined Adjusted Combined Interest Maturity Rate and Interest Maturity Rate and Rate Extended Maturity Rate Extended Maturity Commercial: C&I $ — $ — $ — $ — $ 212 $ 149 Municipal — — — — — — Total Commercial — — — — 212 149 Agricultural — — — — 68 — Real Estate: Construction & Development — — — — 200 — Farm — — — — — — Non-Owner Occupied CRE — — — — — — Owner Occupied CRE — — — — — 1,047 Residential — 18 59 — 263 256 Total Real Estate — 18 59 — 463 1,303 Consumer: Auto — — 19 — — 51 Non-Auto — — 9 — — 9 Total Consumer — — 28 — — 60 Total $ — $ 18 $ 87 $ — $ 743 $ 1,512 During the three and nine-months ended September 30, 2022 , no loans were modified as a troubled debt restructured loan within the previous 12 months and for which there was a payment default and still outstanding, respectively. During the three and nine-months ended September 30, 2021 , one loan was modified as a troubled debt restructured l

Loans Held for Sale

Loans Held for Sale	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Loans Held for Sale	Note 4 - L oans Held-for-Sale Loans held-for-sale totaled $ 18,815,000 , $ 47,721,000 and $ 37,810,000 at September 30, 2022 and 2021, and December 31, 2021, respectively. At September 30, 2022 and 2021, and December 31, 2021, $ 2,923,000 , $ 1,640,000 and $ 3,688,000 , respectively, are valued at the lower of cost or fair value, and the remaining amounts are valued under the fair value option. These loans, which are sold on a servicing released basis, are valued using a market approach by utilizing either: (i) the fair value of the securities backed by similar mortgage loans, adjusted for certain factors to approximate the fair value of a whole mortgage loan, including the value attributable to mortgage servicing and credit risk, (ii) current commitments to purchase loans or (iii) recent observable market trades for similar loans, adjusted for credit risk and other individual loan characteristics. As these prices are derived from market observable inputs, the Company classifies these valuations as Level 2 in the fair value disclosures (see Note 9). Interest income on mortgage loans held-for-sale is recognized based on the contractual rates and reflected in interest income on loans in the consolidated statements of earnings. The Company has no continuing ownership in any residential mortgage loans sold. The Company originates certain mortgage loans for sale in the secondary market. The mortgage loan sales contracts contain indemnification clauses should the loans default, generally in the first three to six months, or if documentation is determined not to be in compliance with regulations. The Company’s historic losses as a result of these indemnities have been insignificant.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2022
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 time frame 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 2 in the fair value disclosures (see Note 9), as the valuations are based on observable market inputs. Forward mortgage-backed securities contracts are exchange-traded or traded within highly active dealer markets. In order to determine the fair value of these instruments, the Company utilizes the exchange price or dealer market price for the particular derivative contract and these instruments are therefore classified as Level 2 in the fair value disclosures (see Note 9). The estimated fair values are subject to change primarily due to changes in interest rates. The impact of these forward contracts is included in gain on sale and fees on mortgage loans in the statement of earnings. These financial instruments are not designated as hedging instruments for accounting purposes. All derivatives are carried at fair value in either other assets or other liabilities and are reflected in the gain on sale and fees on mortgage loans in the consolidated statement of earnings. The following tables provide the outstanding notional balances and fair values of outstanding derivative positions (dollars in thousands): September 30, 2022: Outstanding Asset Liability IRLCs $ 78,653 $ — $ 251 Forward mortgage-backed securities trades 72,500 1,897 — September 30, 2021: Outstanding Asset Liability IRLCs $ 141,121 $ 1,701 $ — Forward mortgage-backed securities trades 145,000 828 — December 31, 2021: Outstanding Asset Liability IRLCs $ 85,973 $ 1,279 $ — Forward mortgage-backed securities trades 116,000 — 147

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Borrowings	Note 6 – Borrowings Borrowings consisted of the following (dollars in thousands): September 30, December 31, 2022 2021 2021 Securities sold under agreements with customers to repurchase $ 749,278 $ 612,239 $ 625,499 Federal funds purchased 4,250 36,440 24,600 Other borrowings 21,053 — 21,053 Total $ 774,581 $ 648,679 $ 671,152 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, 2021 , with Frost Bank. Under the loan agreement, as renewed and amended, we are permitted to draw up to $ 25,000,000 on a revolving line of credit. There was no outstanding balance under the line of credit as of September 30, 2022 and 2021, or December 31, 2021. During 2021, the Company began investing in qualifying Community Development Entities ("CDE") under the federal New Market Tax Credits ("NMTC") program. See Note 7 for further discussion of our activity and related balances on the consolidated balance sheets, including the $ 21,053,000 in other borrowings shown above.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Note 7 - Income Taxes Income tax expense was $ 12,095,000 for the third quarter of 2022 as compared to $ 11,641,000 for the same period in 2021. The Company’s effective tax rates on pretax income were 16.93 % and 16.50 % for the third quarters of 2022 and 2021, respectively. Income tax expense was $ 34,359,000 for the first nine months of 2022 as compared to $ 33,770,000 for the same period in 2021. The Company’s effective tax rates on pretax income were 16.35 % and 16.39 % for the first nine months of 2022 and 2021 , 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 $ 131,000 and $ 55,000 at September 30, 2022 and December 31, 2021 , respectively, which is included in other assets. There were no balances related to this investment on the consolidated balance sheet as of September 30, 2021. 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 yield method and related tax credits are allocated to the Company. At September 30, 2022 and December 31, 2021, the consolidated balance sheet of the Company included a $ 18,000,000 loan to the investee in loans, the $ 29,000,000 CDE investments in other assets and the $ 21,053,000 leveraged loan from the investee in other borrowings (see Note 6). There were no balances related to this investment on the consolidated balance sheet as of September 30, 2021 .

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based Compensation	Note 8 - Stock Based Compensation On April 27, 2021, the Company’s shareholders approved the 2021 Omnibus Stock and Incentive Plan (“2021 Plan”) and reserved 2,500,000 shares of the Company’s common stock for issuance under this plan. At September 30, 2022, the Company had 1,877,004 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 senior officers, executive officers and directors. Restricted stock unit grants are subject to time-based vesting. The total number of restricted stock units granted represents the maximum number of restricted stock units eligible to vest based upon the service conditions set forth in the grant agreements. The following table summarizes information about the changes in restricted stock units for the nine-months ended September 30, 2022 and 2021. For the Nine-Months Ended September 30, 2022 2021 Restricted Weighted Restricted Weighted Balance at beginning of period 22,597 $ 48.91 — $ — Grants 24,833 47.19 22,597 48.91 Vesting ( 7,425 ) 48.91 — — Forfeited/expired ( 348 ) 48.91 — — Balance at end of period 39,657 $ 47.83 22,597 $ 48.91 Performance Stock Units Also under the 2021 Plan, the Company awards performance-based restricted stock units ("PSUs") to executive officers and other officers and employees. 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 nine-months ended September 30, 2022 and 2021. For the Nine-Months Ended September 30, 2022 2021 Performance-Based Restricted Weighted Performance-Based Restricted Weighted Balance at beginning of period 22,597 $ 48.91 — $ — Grants 24,833 47.19 22,597 48.91 Vesting — — — — Forfeited/expired ( 348 ) 48.91 — — Balance at end of period 47,082 $ 48.00 22,597 $ 48.91 Restricted Stock Awards The following table summarizes information about vested and unvested restricted stock. For the Nine-Months Ended September 30, 2022 2021 Restricted Weighted Restricted Weighted Balance at beginning of period 46,598 $ 35.75 95,888 $ 29.89 Grants 15,425 40.89 12,110 49.58 Vesting ( 23,898 ) 40.40 ( 31,081 ) 28.42 Forfeited/expired ( 200 ) 29.70 ( 1,389 ) 32.76 Balance at end of period 37,925 $ 34.94 75,528 $ 33.60 The total fair value of restricted stock vested for the nine-months ended September 30, 2022 and 2021, was $ 1,363,000 and $ 1,534,000 , respectively. The Company recorded restricted stock, restricted stock unit and performance-based restricted stock unit expense for employees of $ 370,000 and $ 347,000 for the three-months ended September 30, 2022 and 2021, respectively. The Company recorded restricted stock, restricted stock unit and performance-based restricted stock unit expense for employees of $ 1,390,000 and $ 926,000 for the nine-months ended September 30, 2022 and 2021, respectively. The Company recorded director expense related to these restricted stock grants of $ 150,000 and $ 150,000 , for the three-months ended September 30, 2022 and 2021, respectively. The Company recorded director expense related to these restricted stock grants of $ 481,000 and $ 450,000 , for the nine-months ended September 30, 2022 and 2021, respectively. As of September 30, 2022 and 2021, there were $ 4,105,000 and $ 3,556,000 respectively, of total unrecognized compensation cost related to unvested restricted stock, restricted stock units and performance-based restricted stock units which is expected to be recognized over a weighted-average period of 1.23 years and 1.49 years, respectively. At September 30, 2022 and 2021, and December 31, 2021, there was $ 72,000 , $ 72,000 and $ 52,000 , 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 grant 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 nine-months ended September 30, 2022 is presented in the table and narrative below:​​​​​​​ Shares Weighted- Outstanding, December 31, 2021 1,669,976 $ 25.11 Granted 240,583 47.19 Exercised ( 322,324 ) 18.53 Cancelled ( 54,854 ) 30.26 Outstanding, September 30, 2022 1,533,381 29.77 Exercisable, September 30, 2022 804,219 $ 21.93 The options outstanding at September 30, 2022 had exercise prices ranging between $ 15.43 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 $ 360,000 and $ 296,000 for the three-months ended September 30, 2022 and 2021, respectively. The Company recorded stock option expense totaling $ 992,000 and $ 987,000 for the nine-months ended September 30, 2022 and 2021, respectively. As of September 30, 2022, there was $ 5,915,000 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 2.04 years. The total fair value of shares vested during the nine-months ended September 30, 2022 and 2021 was $ 1,747,000 and $ 1,246,000 , respectively.

Fair Value Disclosures

Fair Value Disclosures	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Note 9 - Fair Value Disclosures The authoritative accounting guidance for fair value measurements defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability shall not be adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact, and (iv) willing to transact. The authoritative accounting guidance requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert future amounts, such as cash flows or earnings, to a single present amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement costs). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, the authoritative guidance establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: • Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. • Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (for example, interest rates, volatilities, prepayment speeds, loss severities, credit risks and default rates) or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3 Inputs – Significant unobservable inputs that reflect an entity’s own assumptions that market participants would use in pricing the assets or liabilities. A description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Securities classified as available-for-sale and trading are reported at fair value utilizing Level 1 and Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include market spreads, cash flows, the United States Treasury yield curve, live trading levels, trade execution data, dealer quotes, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other items. See Notes 4 and 5 related to the determination of fair value for loans held-for-sale, IRLCs and forward mortgage-backed securities trades. There were no transfers between Level 2 and Level 3 during the three and nine-months ended September 30, 2022 and 2021, and the year ended December 31, 2021. The following table summarizes the Company’s available-for-sale securities, loans held-for-sale, and derivatives which are measured at fair value on a recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands): September 30, 2022 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 477,176 $ — $ — $ 477,176 Obligations of state and political subdivisions — 2,083,812 — 2,083,812 Corporate bonds — 96,322 — 96,322 Residential mortgage-backed securities — 2,696,881 — 2,696,881 Commercial mortgage-backed securities — 387,346 — 387,346 Other securities 3,906 — — 3,906 Total $ 481,082 $ 5,264,361 $ — $ 5,745,443 Loans held-for-sale $ — $ 15,892 $ — $ 15,892 IRLCs $ — $ ( 251 ) $ — $ ( 251 ) Forward mortgage-backed securities trades $ — $ 1,897 $ — $ 1,897 September 30, 2021 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: Obligations of states and political subdivisions $ — $ 2,665,367 $ — $ 2,665,367 Corporate bonds — 32,984 — 32,984 Residential mortgage-backed securities — 3,028,149 — 3,028,149 Commercial mortgage-backed securities — 389,016 — 389,016 Other securities 4,468 — — 4,468 Total $ 4,468 $ 6,115,516 $ — $ 6,119,984 Loans held-for-sale $ — $ 46,081 $ — $ 46,081 IRLCs $ — $ 1,701 $ — $ 1,701 Forward mortgage-backed securities trades $ — $ 828 $ — $ 828 December 31, 2021 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 126,841 $ — $ — $ 126,841 Obligations of state and political subdivisions — 2,753,471 — 2,753,471 Corporate bonds — 63,868 — 63,868 Residential mortgage-backed securities — 3,259,449 — 3,259,449 Commercial mortgage-backed securities — 365,120 — 365,120 Other securities 4,430 — — 4,430 Total $ 131,271 $ 6,441,908 $ — $ 6,573,179 Loans held-for-sale $ — $ 34,122 $ — $ 34,122 IRLCs $ — $ 1,279 $ — $ 1,279 Forward mortgage-backed securities trades $ — $ ( 147 ) $ — $ ( 147 ) The following table summarizes the Company’s loans held-for-sale at fair value and the net unrealized gains as of the balance sheet dates shown below (dollars in thousands): September 30, December 31, 2022 2021 2021 Unpaid principal balance on loans held-for-sale $ 15,998 $ 44,784 $ 33,200 Net unrealized gains (losses) on loans held-for-sale ( 106 ) 1,297 922 Loans held-for-sale at fair value $ 15,892 $ 46,081 $ 34,122 The following table summarizes the Company’s gains on sale and fees of mortgage loans for the three and nine-months ended September 30, 2022 and 2021 (dollars in thousand): Three-Months Ended Nine-Months Ended 2022 2021 2022 2021 Realized gain on sale and fees on mortgage loans* $ 4,664 $ 9,050 $ 16,973 $ 29,245 Change in fair value on loans held-for-sale and IRLCs ( 2,433 ) ( 1,466 ) ( 2,886 ) ( 4,659 ) Change in forward mortgage-backed securities trades 1,839 1,204 2,044 2,387 Total gain on sale of mortgage loans $ 4,070 $ 8,788 $ 16,131 $ 26,973 * This includes gains on loans held-for-sale carried under the fair value method and lower of cost or market. No residential mortgage loans held-for-sale were 90 days or more past due or considered nonaccrual as of September 30, 2022, September 30, 2021, or December 31, 2021 . No significant credit losses were recognized on mortgage loans held-for-sale for the three and nine-months ended September 30, 2022 and 2021. 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 and nine-months ended September 30, 2021 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. The Company had no other real estate owned during the three and nine-months ended September 30, 2022 . 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 and nine-months ended September 30, 2022 and 2021. At September 30, 2022 and December 31, 2021 , the Company had no other real estate owned. At September 30, 2021, other real estate owned totaled $ 28,000 . The Company is required under current authoritative accounting guidance to disclose the estimated fair value of their financial instrument assets and liabilities including those subject to the requirements discussed above. For the Company, as for most financial institutions, substantially all of its assets and liabilities are considered financial instruments. Many of the Company’s financial instruments, however, lack an available trading market as characterized by a willing buyer and willing seller engaging in an exchange transaction. The estimated fair value amounts of financial instruments have been determined by the Company using available market information and appropriate valuation methodologies. However, considerable judgment is required to interpret data to develop the estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize in a current market exchange. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. In addition, reasonable comparability between financial institutions may not be likely due to the wide range of permitted valuation techniques and numerous estimates that must be made given the absence of active secondary markets for many of the financial instruments. This lack of uniform valuation methodologies also introduces a greater degree of subjectivity to these estimated fair values. Cash and due from banks, federal funds sold, interest-bearing deposits in banks and accrued interest receivable and payable are liquid in nature and considered Levels 1 or 2 of the fair value hierarchy. Financial instruments with stated maturities have been valued using a present value discounted cash flow with a discount rate approximating current market for similar assets and liabilities and are considered Levels 2 and 3 of the fair value hierarchy. Financial instrument liabilities with no stated maturities have an estimated fair value equal to both the amount payable on demand and the carrying value and are considered Level 1 of the fair value hierarchy. The carrying value and the estimated fair value of the Company’s contractual off-balance-sheet unfunded lines of credit, loan commitments and letters of credit, which are generally priced at market at the time of funding, are not material. The estimated fair values and carrying values of all financial instruments under current authoritative guidance were as follows (dollars in thousands). September 30, December 31, 2022 2021 2021 Carrying Estimated Carrying Estimated Carrying Estimated Fair Value Cash and due from banks $ 227,298 $ 227,298 $ 201,901 $ 201,901 $ 205,053 $ 205,053 Level 1 Interest-bearing demand deposits 138,484 138,484 359,241 359,241 323,535 323,535 Level 1 Available-for-sale securities 5,745,443 5,745,443 6,119,984 6,119,984 6,573,179 6,573,179 Levels 1 Loans held-for-investment, net of 6,181,380 6,215,441 5,223,124 5,236,471 5,325,507 5,335,791 Level 3 Loans held-for-sale 18,815 18,815 47,721 47,748 37,810 37,844 Level 2 Accrued interest receivable 49,416 49,416 43,516 43,516 57,169 57,169 Level 2 Deposits with stated maturities 418,102 416,400 469,867 470,985 461,415 462,312 Level 2 Deposits with no stated maturities 10,724,016 10,724,016 9,423,250 9,423,250 10,105,073 10,105,073 Level 1 Borrowings 774,581 774,581 648,679 648,679 671,152 671,152 Level 2 Accrued interest payable 494 494 294 294 221 221 Level 2 IRLCs ( 251 ) ( 251 ) 1,701 1,701 1,279 1,279 Level 2 Forward mortgage-backed securities 1,897 1,897 828 828 ( 147 ) ( 147 ) Level 2

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2022
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 78 locations located in Texas as of September 30, 2022 . The Company’s subsidiary bank is First Financial Bank, N.A. 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, N.A. is located. In addition, the Company also owns First Financial Trust & Asset Management Company, N.A., First Financial Insurance Agency, Inc., First Technology Services, Inc. and FB Investment Paris Fund, LLC.
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 in Preparation of Financial Statements	Use of Estimates in Preparation of Financial Statements 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. 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. Subsequent to July 27, 2021 and through September 30, 2022, 244,559 shares were repurchased and retired at an average price of $ 38.61 .
Other Recently Issued and Effective Authoritative Accounting Guidance	Other Recently Issued and Effective Authoritative Accounting Guidance ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” ASU 2019-12, simplifies the accounting for income taxes by eliminating certain exceptions related to the approach for intra-period tax aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. ASU 2019-12 was effective for the Company for annual reporting periods after December 15, 2020, and interim periods within. Adoption of ASU 2019-12 did not have a significant impact on the Company’s financial statements and related disclosures. 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 generally can be applied through December 31, 2022. 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 generally can be applied through December 31, 2022. 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 will become 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 is not expected to have a significant impact on our financial statements.
Investment Securities	Investment Securities Management classifies debt securities as held-to-maturity, available-for-sale, or trading based on its intent. Securities that management has the positive intent and ability to hold to maturity are classified as held-to-maturity and recorded at amortized cost, adjusted for amortization of premiums and accretion of discounts, which are recognized as adjustments to interest income using the interest method. Securities not classified as held-to-maturity or trading are classified as available-for-sale and recorded at fair value, with unrealized holding gains and losses (those for which no allowance for credit losses are recorded) reported as a component of other comprehensive income, net of tax. Management determines the appropriate classification of securities at the time of purchase. Interest income includes amortization of purchase premiums and discounts over the period to maturity using a level-yield method, except for premiums on callable securities, which are amortized to their earliest call date. Realized gains and losses are recorded on the sale of securities in noninterest income. The Company has made a policy election to exclude accrued interest from the amortized cost basis of securities and report accrued interest separately in other assets on the consolidated balance sheets. A security is placed on nonaccrual status at the time any principal or interest payments become more than 90 days delinquent or if full collection of interest or principal becomes uncertain. Accrued interest for a security placed on nonaccrual is reversed against interest income. There was no accrued interest related to securities reversed against interest income for the three and nine-months ended September 30, 2022 and 2021. 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 it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, any previously recognized allowances are charged-off and the security’s amortized cost basis is written down to fair value through income as a provision for credit losses. For available-for-sale securities that do not meet the aforementioned criteria, we evaluate whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Management has made the accounting policy election to exclude accrued interest receivable on available-for-sale securities from the estimate of credit losses. Changes in the allowance for credit losses are recorded as provision for (or reversal of) credit losses. Available-for-sale securities are charged-off against the allowance or, in the absence of any allowance, written down through income when deemed uncollectible by management or when either of the aforementioned criteria regarding intent or requirement to sell is met. At September 30, 2022 and 2021, and December 31, 2021 , no allowance for credit losses - available-for-sale securities was recorded.
Allowance for Credit Losses – Held-to-Maturity Securities	Allowance for Credit Losses – Held-to-Maturity Securities The allowance for credit losses on held-to-maturity securities is a contra-asset valuation account, calculated in accordance with ASC 326, that is deducted from the amortized cost basis of held-to-maturity securities to present management’s best estimate of the net amount expected to be collected. Held-to-maturity securities are charged-off against the allowance when deemed uncollectible by management. Adjustments to the allowance are reported in our income statement as a component of credit loss expense. Management measures expected credit losses on held-to-maturity securities on a collective basis by major security type with each type sharing similar risk characteristics and considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. Management has made the accounting policy election to exclude accrued interest receivable on held-to-maturity securities from the estimate of credit losses. At September 30, 2022 and 2021, and December 31, 2021 , 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 troubled-debt restructurings 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. Upon the adoption of ASC 326, 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 that consider concentrations of the loan portfolio, expected changes to the economic forecasts, large relationships, early delinquencies, and factors related to credit administrations, including, among others, loan-to-value ratios, borrowers’ risk rating and credit score migrations; 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 Commercial and Industrial (“C&I”), Municipal, Agricultural, Construction and Development, Farm, Non-Owner Occupied and Owner Occupied Commercial Real Estate (“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 or decrease management’s estimate of expected credit losses by a calculated percentage or amount based upon the estimated level of risk. The various risks that may be considered in making Q-Factor adjustments include, among other things, the impact of (i) changes in lending policies and procedures, including changes in underwriting standards and practices for collections, write-offs, and recoveries, (ii) actual and expected changes in national, regional, and local economic and business conditions and developments that affect the collectability of the loan pools, (iii) changes in the nature, volume and size of a loan or the loan pools and in the terms of the underlying loans, (iv) changes in the experience, ability, and depth of our lending management and staff, (v) changes in volume and severity of past due financial assets, the volume of nonaccrual assets, and the volume and severity of adversely classified or graded assets, (vi) changes in the quality of our credit review function, (vii) changes in the value of the underlying collateral for loans that are non-collateral dependent, (viii) the existence, growth, and effect of any concentrations of credit and (ix) other factors such as the regulatory, legal and technological environments, competition, and events such as natural disasters or health pandemics. Management believes it uses relevant information available to make determinations about the allowance and that it has established the existing allowance in accordance with GAAP. However, the determination of the allowance requires significant judgment, and estimates of expected lifetime losses in the loan portfolio can vary significantly from the amounts actually observed. While management uses available information to recognize expected losses, future additions to the allowance may be necessary based on changes in the loans comprising the portfolio, changes in the current and forecasted economic conditions, changes to the interest rate environment which may directly impact prepayment and curtailment rate assumptions, and changes in the financial condition of borrowers.
Allowance for Credit Losses - Off-Balance-Sheet/Reserve for Unfunded Commitments	Allowance for Credit Losses - Off-Balance-Sheet/Reserve for Unfunded Commitments The allowance for credit losses on off-balance-sheet credit exposures is a liability account, calculated in accordance with ASC 326, representing expected credit losses over the contractual period for which we are exposed to credit risk resulting from a contractual obligation to extend credit. These obligations include unfunded lines of credit, commitments to extend credit and federal funds sold to correspondent banks and standby letters of credit. No allowance is recognized if we have the unconditional right to cancel the obligation. The allowance is reported as a component of accrued interest payable and other liabilities in our consolidated balance sheets. Adjustments to the allowance are reported in our income statement as a component of the provision for credit losses. At September 30, 2022 and 2021, and December 31, 2021, the Company’s reserve for unfunded commitments totaled $ 10,879,000 , $ 6,751,000 and $ 6,436,000 , 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. 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 allowance for credit losses. 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 for the three or nine-months ended September 30, 2022 or 2021 , 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 gains or losses on the Company’s available-for-sale securities, net of applicable income taxes, totaling $ 632,421,000 of losses at September 30, 2022 and $ 109,447,000 and $ 99,253,000 of gains at September 30, 2021 and December 31, 2021 , respectively, are included in accumulated other comprehensive earnings (loss) as a separate component of shareholders' equity.
Income Taxes	Income Taxes The Company’s provision for income taxes is based on income before income taxes adjusted for permanent differences between financial reporting and taxable income. Deferred tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is determined based on the tax effects of the temporary differences between the book and tax bases of the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. As of September 30, 2022, deferred tax assets totaled $ 168,398,000 and were included in other assets on the consolidated balance sheets. As of September 30, 2021, and December 31, 2021, deferred tax liabilities totaled $ 27,524,000 and $ 24,817,000 , respectively, and were included in other liabilities 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 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/or performance metrics over a three-year period related to a defined group of peers. 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. 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 reflected 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 346,000 and 272,000 anti-dilutive shares for the three and nine-months ended September 30, 2022, respectively, that were excluded from the computation of EPS. There were 127,000 and 46,000 anti-dilutive shares for the three and nine-months ended September 30, 2021 , respectively. The following table reconciles the computation of basic EPS to diluted EPS: Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended September 30, 2022: Net earnings per share, basic $ 59,341 142,524,500 $ 0.42 Effect of stock options and stock grants — 601,588 ( 0.01 ) Net earnings per share, diluted $ 59,341 143,126,088 $ 0.41 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the nine-months ended September 30, 2022: Net earnings per share, basic $ 175,807 142,588,373 $ 1.23 Effect of stock options and stock grants — 658,395 — Net earnings per share, diluted $ 175,807 143,246,768 $ 1.23 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended September 30, 2021: Net earnings per share, basic $ 58,928 142,334,449 $ 0.41 Effect of stock options and stock grants — 884,471 — Net earnings per share, diluted $ 58,928 143,218,920 $ 0.41 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the nine-months ended September 30, 2021: Net earnings per share, basic $ 172,225 142,242,783 $ 1.21 Effect of stock options and stock grants — 941,009 ( 0.01 ) Net earnings per share, diluted $ 172,225 143,183,792 $ 1.20

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Computation of Basic EPS to Dilutive EPS	The following table reconciles the computation of basic EPS to diluted EPS: Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended September 30, 2022: Net earnings per share, basic $ 59,341 142,524,500 $ 0.42 Effect of stock options and stock grants — 601,588 ( 0.01 ) Net earnings per share, diluted $ 59,341 143,126,088 $ 0.41 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the nine-months ended September 30, 2022: Net earnings per share, basic $ 175,807 142,588,373 $ 1.23 Effect of stock options and stock grants — 658,395 — Net earnings per share, diluted $ 175,807 143,246,768 $ 1.23 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the three-months ended September 30, 2021: Net earnings per share, basic $ 58,928 142,334,449 $ 0.41 Effect of stock options and stock grants — 884,471 — Net earnings per share, diluted $ 58,928 143,218,920 $ 0.41 Net Weighted Earnings Average Per Share (in thousands) Shares Amount For the nine-months ended September 30, 2021: Net earnings per share, basic $ 172,225 142,242,783 $ 1.21 Effect of stock options and stock grants — 941,009 ( 0.01 ) Net earnings per share, diluted $ 172,225 143,183,792 $ 1.20

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2022
Cash and Cash Equivalents [Abstract]
Summary of Available-for-Sale Securities	The amortized cost, related gross unrealized gains and losses, allowance for credit losses and the fair value of available-for-sale securities are as follows (dollars in thousands): September 30, 2022 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 504,457 $ 2 $ ( 27,283 ) $ 477,176 Obligations of states and political subdivisions 2,368,605 514 ( 285,307 ) 2,083,812 Residential mortgage-backed securities 3,153,864 14 ( 456,997 ) 2,696,881 Commercial mortgage-backed securities 406,530 1 ( 19,185 ) 387,346 Corporate bonds and other 113,015 — ( 12,787 ) 100,228 Total securities available-for-sale $ 6,546,471 $ 531 $ ( 801,559 ) $ 5,745,443 September 30, 2021 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: Obligations of states and political subdivisions $ 2,568,224 $ 103,646 $ ( 6,503 ) $ 2,665,367 Residential mortgage-backed securities 2,999,369 35,950 ( 7,170 ) 3,028,149 Commercial mortgage-backed securities 375,614 13,402 — 389,016 Corporate bonds and other 38,167 70 ( 785 ) 37,452 Total securities available-for-sale $ 5,981,374 $ 153,068 $ ( 14,458 ) $ 6,119,984 December 31, 2021 Gross Gross Amortized Unrealized Unrealized Estimated Cost Basis Holding Gains Holding Losses Fair Value Securities available-for-sale: U.S. Treasury securities $ 126,716 $ 125 $ — $ 126,841 Obligations of states and political subdivisions 2,638,369 116,319 ( 1,217 ) 2,753,471 Residential mortgage-backed securities 3,256,746 23,990 ( 21,287 ) 3,259,449 Commercial mortgage-backed securities 356,207 8,914 ( 1 ) 365,120 Corporate bonds and other 69,472 32 ( 1,206 ) 68,298 Total securities available-for-sale $ 6,447,510 $ 149,380 $ ( 23,711 ) $ 6,573,179
Amortized Cost and Estimated Fair Value of Available-for-Sale Securities	The amortized cost and estimated fair value of available-for-sale securities at September 30, 2022, by contractual and expected maturity, are shown below (dollars in thousands): Amortized Estimated Cost Basis Fair Value Due within one year $ 239,974 $ 238,511 Due after one year through five years 2,213,010 2,056,408 Due after five years through ten years 2,394,729 2,051,847 Due after ten years 1,698,758 1,398,677 Total $ 6,546,471 $ 5,745,443
Continuous Unrealized-Loss Position of Available-for-Sale Securities	The following tables disclose as of September 30, 2022 and 2021, and December 31, 2021 , the Company’s investment securities that have been in a continuous unrealized-loss position for less than 12 months and for 12 or more months (dollars in thousands): Less than 12 Months 12 Months or Longer Total September 30, 2022 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 476,696 $ 27,283 $ — $ — $ 476,696 $ 27,283 Obligations of states and political subdivisions 1,828,105 254,212 139,732 31,095 1,967,837 285,307 Residential mortgage-backed securities 1,507,121 231,915 1,187,815 225,082 2,694,936 456,997 Commercial mortgage-backed securities 386,479 19,185 — — 386,479 19,185 Corporate bonds and other 59,782 4,544 40,446 8,243 100,228 12,787 Total $ 4,258,183 $ 537,139 $ 1,367,993 $ 264,420 $ 5,626,176 $ 801,559 Less than 12 Months 12 Months or Longer Total September 30, 2021 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Obligations of states and political subdivisions $ 570,916 $ 6,036 $ 18,711 $ 467 $ 589,627 $ 6,503 Residential mortgage-backed securities 1,208,129 7,166 2,051 4 1,210,180 7,170 Corporate bonds and other 32,985 785 — — 32,985 785 Total $ 1,812,030 $ 13,987 $ 20,762 $ 471 $ 1,832,792 $ 14,458 Less than 12 Months 12 Months or Longer Total December 31, 2021 Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Obligations of states and political subdivisions $ 163,698 $ 1,096 $ 18,943 $ 122 $ 182,641 $ 1,218 Residential mortgage-backed securities 2,263,010 19,742 54,392 1,544 2,317,402 21,286 Commercial mortgage-backed securities 820 1 — — 820 1 Corporate bonds and other 47,436 635 16,432 571 63,868 1,206 Total $ 2,474,964 $ 21,474 $ 89,767 $ 2,237 $ 2,564,731 $ 23,711

Loans Held for Investment and_2

Loans Held for Investment and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2022
Receivables [Abstract]
Loans Held-for-Investment by Portfolio Segment	Loans held-for-investment by portfolio segment are as follows (dollars in thousands): September 30, December 31, 2022 2021 2021 Commercial: C&I* $ 871,335 $ 819,597 $ 837,075 Municipal 214,852 165,847 177,905 Total Commercial 1,086,187 985,444 1,014,980 Agricultural 76,937 98,947 98,089 Real Estate: Construction & Development 938,051 656,530 749,793 Farm 268,139 203,064 217,220 Non-Owner Occupied CRE 717,738 674,958 623,434 Owner Occupied CRE 945,665 824,231 821,653 Residential 1,536,180 1,328,798 1,334,419 Total Real Estate 4,405,773 3,687,581 3,746,519 Consumer: Auto 538,798 394,072 405,416 Non-Auto 147,793 120,450 123,968 Total Consumer 686,591 514,522 529,384 Total Loans 6,255,488 5,286,494 5,388,972 Less: Allowance for credit losses ( 74,108 ) ( 63,370 ) ( 63,465 ) Loans, net $ 6,181,380 $ 5,223,124 $ 5,325,507
Non-Accrual Loans, Loans Still Accruing and Past Due 90 Days or More and Restructured Loans	The Company’s nonaccrual loans, loans still accruing and past due 90 days or more and restructured loans are as follows (dollars in thousands): September 30, December 31, 2022 2021 2021 Nonaccrual loans $ 24,585 $ 25,210 $ 31,652 Loans still accruing and past due 90 days or more 15 23 8 Troubled debt restructured loans still accruing* 19 22 21 Total $ 24,619 $ 25,255 $ 31,681
Schedule of Non-Accrual Loans	Nonaccrual loans at September 30, 2022 and 2021, and December 31, 2021, consisted of the following (dollars in thousands): September 30, December 31, 2022 2021 2021 Commercial: C&I $ 5,966 $ 3,430 $ 5,370 Municipal — — — Total Commercial 5,966 3,430 5,370 Agricultural 338 949 4,920 Real Estate: Construction & Development 1,696 1,455 708 Farm 91 965 1,173 Non-Owner Occupied CRE 2,406 2,776 2,671 Owner Occupied CRE 6,703 6,551 7,897 Residential 6,762 8,399 8,360 Total Real Estate 17,658 20,146 20,809 Consumer: Auto 596 589 514 Non-Auto 27 96 39 Total Consumer 623 685 553 Total $ 24,585 $ 25,210 $ 31,652
Changes in Allowance for Loan Losses	Summary information on the allowance for credit losses for the three and nine-months ended September 30, 2022 and 2021, are outlined by portfolio segment in the following tables (dollars in thousands): Three-Months Ended September 30, 2022 C&I Municipal Agricultural Construction Farm Beginning balance $ 18,589 $ 1,352 $ 1,162 $ 21,085 $ 1,006 Provision for loan losses ( 2,378 ) ( 33 ) ( 187 ) 4,614 149 Recoveries 266 — 18 — — Charge-offs ( 38 ) — — — — Ending balance $ 16,439 $ 1,319 $ 993 $ 25,699 $ 1,155 Three-Months Ended September 30, 2022 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 8,410 $ 10,740 $ 8,304 $ 912 $ 372 $ 71,932 Provision for loan losses ( 498 ) ( 1,303 ) 557 72 67 1,060 Recoveries 283 649 93 47 53 1,409 Charge-offs — — — ( 119 ) ( 136 ) ( 293 ) Ending balance $ 8,195 $ 10,086 $ 8,954 $ 912 $ 356 $ 74,108 Nine-Months Ended September 30, 2022 C&I Municipal Agricultural Construction Farm Beginning balance $ 12,280 $ 348 $ 1,597 $ 17,627 $ 663 Provision for loan losses 3,598 971 ( 730 ) 8,172 492 Recoveries 824 — 135 — — Charge-offs ( 263 ) — ( 9 ) ( 100 ) — Ending balance $ 16,439 $ 1,319 $ 993 $ 25,699 $ 1,155 Nine-Months Ended September 30, 2022 (continued) Non-Owner Owner Residential Auto Non-Auto Total Beginning balance $ 10,722 $ 10,828 $ 8,133 $ 896 $ 371 $ 63,465 Provision for loan losses ( 3,352 ) ( 1,323 ) 860 116 106 8,910 Recoveries 825 669 110 215 182 2,960 Charge-offs — ( 88 ) ( 149 ) ( 315 ) ( 303 ) ( 1,227 ) Ending balance $ 8,195 $ 10,086 $ 8,954 $ 912 $ 356 $ 74,108 Three-Months Ended September 30, 2021 C&I Municipal Agricultural Construction Farm Beginning balance $ 10,186 $ 588 $ 1,312 $ 15,632 $ 607 Provision for loan losses ( 31 ) ( 273 ) 1,022 1,230 ( 21 ) Recoveries 1,140 — 5 — — Charge-offs ( 902 ) — ( 50 ) — — Ending balance $ 10,393 $ 315 $ 2,289 $ 16,862 $ 586 Three-Months Ended September 30, 2021 (continued) Non-Owner Owner Residential Auto Non- Total Beginning balance $ 10,432 $ 10,399 $ 11,234 $ 1,266 $ 482 $ 62,138 Provision for loan losses ( 344 ) ( 94 ) ( 1,184 ) ( 259 ) ( 46 ) — Recoveries 556 806 7 129 64 2,707 Charge-offs — ( 222 ) — ( 176 ) ( 125 ) ( 1,475 ) Ending balance $ 10,644 $ 10,889 $ 10,057 $ 960 $ 375 $ 63,370 Nine-Months Ended September 30, 2021 C&I Municipal Agricultural Construction Farm Beginning balance $ 13,609 $ 1,552 $ 1,255 $ 13,512 $ 1,876 Provision for loan losses ( 3,597 ) ( 1,237 ) 1,076 3,348 ( 1,300 ) Recoveries 1,671 — 29 2 10 Charge-offs ( 1,290 ) — ( 71 ) — — Ending balance $ 10,393 $ 315 $ 2,289 $ 16,862 $ 586 Nine-Months Ended September 30, 2021 (continued) Non-Owner Owner Residential Auto Non- Total Beginning balance $ 8,391 $ 12,347 $ 12,601 $ 1,020 $ 371 $ 66,534 Provision for loan losses 1,609 ( 2,044 ) ( 2,542 ) 139 80 ( 4,468 ) Recoveries 650 816 90 305 172 3,745 Charge-offs ( 6 ) ( 230 ) ( 92 ) ( 504 ) ( 248 ) ( 2,441 ) Ending balance $ 10,644 $ 10,889 $ 10,057 $ 960 $ 375 $ 63,370
Schedule of loans that are individually evaluated for credit losses	The Company’s loans that are ind ividually evaluated for credit losses (both collateral and non-collateral dependent) and their related allowances as of September 30, 2022 and 2021, and December 31, 2021, are summarized in the following tables by loan segment (dollars in thousands): September 30, 2022 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 334 $ 5,632 $ 20,844 $ 26,810 $ 4,094 $ 4,345 $ 8,439 Municipal — — 71 71 — — — Total Commercial 334 5,632 20,915 26,881 4,094 4,345 8,439 Agricultural 116 222 412 750 103 247 350 Real Estate: Construction & Development 919 777 5,461 7,157 207 384 591 Farm — 91 1,616 1,707 2 39 41 Non-Owner Occupied CRE 2,230 176 32,959 35,365 12 2,317 2,329 Owner Occupied CRE 5,700 1,003 30,136 36,839 103 1,958 2,061 Residential 4,129 2,633 26,076 32,838 293 1,347 1,640 Total Real Estate 12,978 4,680 96,248 113,906 617 6,045 6,662 Consumer: Auto — 596 1,096 1,692 1 2 3 Non-Auto — 27 461 488 — 1 1 Total Consumer — 623 1,557 2,180 1 3 4 Total $ 13,428 $ 11,157 $ 119,132 $ 143,717 $ 4,815 $ 10,640 $ 15,455 September 30, 2021 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 1,311 $ 2,119 $ 18,713 $ 22,143 $ 610 $ 3,296 $ 3,906 Municipal — — 121 121 — — — Total Commercial 1,311 2,119 18,834 22,264 610 3,296 3,906 Agricultural 328 621 6,944 7,893 184 1,965 2,149 Real Estate: Construction & Development 1,225 230 4,872 6,327 6 158 164 Farm 878 87 2,140 3,105 — 6 6 Non-Owner Occupied CRE 2,629 147 33,382 36,158 16 3,959 3,975 Owner Occupied CRE 5,886 665 42,781 49,332 99 3,382 3,481 Residential 3,634 4,765 30,090 38,489 641 2,022 2,663 Total Real Estate 14,252 5,894 113,265 133,411 762 9,527 10,289 Consumer: Auto — 589 1,181 1,770 2 2 4 Non-Auto — 96 337 433 — 2 2 Total Consumer — 685 1,518 2,203 2 4 6 Total $ 15,891 $ 9,319 $ 140,561 $ 165,771 $ 1,558 $ 14,792 $ 16,350 December 31, 2021 Collateral Collateral Non-Collateral Total Loans Related Related Total Commercial: C&I $ 749 $ 4,621 $ 19,021 $ 24,391 $ 2,533 $ 4,094 $ 6,627 Municipal — — 109 109 — — — Total Commercial 749 4,621 19,130 24,500 2,533 4,094 6,627 Agricultural 3,026 1,894 478 5,398 1,086 359 1,445 Real Estate: Construction & Development 102 606 4,765 5,473 90 135 225 Farm 997 176 1,969 3,142 — 2 2 Non-Owner Occupied CRE 2,543 128 31,797 34,468 15 4,044 4,059 Owner Occupied CRE 6,548 1,349 40,607 48,504 152 3,329 3,481 Residential 5,990 2,370 29,210 37,570 307 1,719 2,026 Total Real Estate 16,180 4,629 108,348 129,157 564 9,229 9,793 Consumer: Auto — 514 1,161 1,675 1 3 4 Non-Auto — 39 416 455 — 1 1 Total Consumer — 553 1,577 2,130 1 4 5 Total $ 19,955 $ 11,697 $ 129,533 $ 161,185 $ 4,184 $ 13,686 $ 17,870
Schedule of Allowance for Loan Losses by Portfolio Segment	The Company’s allowance for loans that are individually evaluated for credit losses and collectively evaluated for credit losses as of September 30, 2022 and 2021, and December 31, 2021, are summarized in the following table by loan segment (dollars in thousands). Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. September 30, 2022 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 8,439 $ — $ 350 $ 591 $ 41 Loans collectively evaluated for credit losses 8,000 1,319 643 25,108 1,114 Total $ 16,439 $ 1,319 $ 993 $ 25,699 $ 1,155 September 30, 2022 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 2,329 $ 2,061 $ 1,640 $ 3 $ 1 $ 15,455 Loans collectively evaluated for credit losses 5,866 8,025 7,314 909 355 58,653 Total $ 8,195 $ 10,086 $ 8,954 $ 912 $ 356 $ 74,108 September 30, 2021 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 3,906 $ — $ 2,149 $ 164 $ 6 Loans collectively evaluated for credit losses 6,487 315 140 16,698 580 Total $ 10,393 $ 315 $ 2,289 $ 16,862 $ 586 September 30, 2021 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 3,975 $ 3,481 $ 2,663 $ 4 $ 2 $ 16,350 Loans collectively evaluated for credit losses 6,669 7,408 7,394 956 373 47,020 Total $ 10,644 $ 10,889 $ 10,057 $ 960 $ 375 $ 63,370 December 31, 2021 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 6,627 $ — $ 1,445 $ 225 $ 2 Loans collectively evaluated for credit losses 5,653 348 152 17,402 661 Total $ 12,280 $ 348 $ 1,597 $ 17,627 $ 663 December 31, 2021 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 4,059 $ 3,481 $ 2,026 $ 4 $ 1 $ 17,870 Loans collectively evaluated for credit losses 6,663 7,347 6,107 892 370 45,595 Total $ 10,722 $ 10,828 $ 8,133 $ 896 $ 371 $ 63,465
Schedule of Investment in Loans Related to Balance in Allowance for Loan Losses on Basis of Company's Impairment Methodology	The Company’s recorded investment in loans as of September 30, 2022 and 2021, and December 31, 2021, related to the balance in the allowance for credit losses follows below (dollars in thousands): September 30, 2022 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 26,810 $ 71 $ 750 $ 7,157 $ 1,707 Loans collectively evaluated for credit losses 844,525 214,781 76,187 930,894 266,432 Total $ 871,335 $ 214,852 $ 76,937 $ 938,051 $ 268,139 September 30, 2022 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 35,365 $ 36,839 $ 32,838 $ 1,692 $ 488 $ 143,717 Loans collectively evaluated for credit losses 682,373 908,826 1,503,342 537,106 147,305 6,111,771 Total $ 717,738 $ 945,665 $ 1,536,180 $ 538,798 $ 147,793 $ 6,255,488 September 30, 2021 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 22,143 $ 121 $ 7,893 $ 6,327 $ 3,105 Loans collectively evaluated for credit losses 797,454 165,726 91,054 650,203 199,959 Total $ 819,597 $ 165,847 $ 98,947 $ 656,530 $ 203,064 September 30, 2021 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 36,158 $ 49,332 $ 38,489 $ 1,770 $ 433 $ 165,771 Loans collectively evaluated for credit losses 638,800 774,899 1,290,309 392,302 120,017 5,120,723 Total $ 674,958 $ 824,231 $ 1,328,798 $ 394,072 $ 120,450 $ 5,286,494 December 31, 2021 C&I Municipal Agricultural Construction Farm Loans individually evaluated for credit losses $ 24,391 $ 109 $ 5,398 $ 5,473 $ 3,142 Loans collectively evaluated for credit losses 812,684 177,796 92,691 744,320 214,078 Total $ 837,075 $ 177,905 $ 98,089 $ 749,793 $ 217,220 December 31, 2021 (continued) Non-Owner Owner Residential Auto Non-Auto Total Loans individually evaluated for credit losses $ 34,468 $ 48,504 $ 37,570 $ 1,675 $ 455 $ 161,185 Loans collectively evaluated for credit losses 588,966 773,149 1,296,849 403,741 123,513 5,227,787 Total $ 623,434 $ 821,653 $ 1,334,419 $ 405,416 $ 123,968 $ 5,388,972
Schedule of Company's Internal Ratings of its Loans Held-for-Investment, Including The Year of Origination, by Portfolio Segments	The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at September 30, 2022 (dollars in millions): September 30, 2022 2021 2020 2019 2018 Prior Revolving Total C&I Risk rating: Pass $ 495 $ 226 $ 65 $ 24 $ 18 $ 16 $ — $ 844 Special mention 1 — — 1 — — — 2 Substandard 11 7 3 1 3 — — 25 Doubtful — — — — — — — — Total $ 507 $ 233 $ 68 $ 26 $ 21 $ 16 $ — $ 871 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Municipal Risk rating: Pass $ 67 $ 21 $ 16 $ 5 $ 20 $ 86 $ — $ 215 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 67 $ 21 $ 16 $ 5 $ 20 $ 86 $ — $ 215 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Agricultural Risk rating: Pass $ 46 $ 21 $ 4 $ 3 $ 1 $ 1 $ — $ 76 Special mention — — — — — — — — Substandard — 1 — — — — — 1 Doubtful — — — — — — — — Total $ 46 $ 22 $ 4 $ 3 $ 1 $ 1 $ — $ 77 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Construction & Development Risk rating: Pass $ 504 $ 317 $ 78 $ 15 $ 8 $ 9 $ — $ 931 Special mention — 2 — — — — — 2 Substandard 4 1 — — — — — 5 Doubtful — — — — — — — — Total $ 508 $ 320 $ 78 $ 15 $ 8 $ 9 $ — $ 938 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Farm Risk rating: Pass $ 101 $ 89 $ 33 $ 12 $ 8 $ 23 $ — $ 266 Special mention — — — — — — — — Substandard 1 — — — — 1 — 2 Doubtful — — — — — — — — Total $ 102 $ 89 $ 33 $ 12 $ 8 $ 24 $ — $ 268 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 223 $ 200 $ 108 $ 51 $ 22 $ 79 $ — $ 683 Special mention — 1 — 11 — 7 — 19 Substandard 5 1 1 2 1 6 — 16 Doubtful — — — — — — — — Total $ 228 $ 202 $ 109 $ 64 $ 23 $ 92 $ — $ 718 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 280 $ 223 $ 134 $ 81 $ 67 $ 124 $ — $ 909 Special mention — 1 2 4 — 1 — 8 Substandard 1 2 1 3 11 11 — 29 Doubtful — — — — — — — Total $ 281 $ 226 $ 137 $ 88 $ 78 $ 136 $ — $ 946 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Residential Risk rating: Pass $ 433 $ 382 $ 183 $ 87 $ 68 $ 224 $ 126 $ 1,503 Special mention — 2 3 — — 3 — 8 Substandard 4 3 3 2 1 9 3 25 Doubtful — — — — — — — Total $ 437 $ 387 $ 189 $ 89 $ 69 $ 236 $ 129 $ 1,536 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Auto Risk rating: Pass $ 284 $ 149 $ 64 $ 29 $ 8 $ 3 $ — $ 537 Special mention — — — — — — — — Substandard — — 1 1 — — — 2 Doubtful — — — — — — — Total $ 284 $ 149 $ 65 $ 30 $ 8 $ 3 $ — $ 539 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Non-Auto Risk rating: Pass $ 73 $ 48 $ 13 $ 4 $ 2 $ 1 $ 7 $ 148 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 73 $ 48 $ 13 $ 4 $ 2 $ 1 $ 7 $ 148 September 30, 2022 2021 2020 2019 2018 Prior Revolving Total Total Loans Risk rating: Pass $ 2,506 $ 1,676 $ 698 $ 311 $ 222 $ 566 $ 133 $ 6,112 Special mention 1 6 5 16 — 11 — 39 Substandard 26 15 9 9 16 27 3 105 Doubtful — — — — — — — — Total $ 2,533 $ 1,697 $ 712 $ 336 $ 238 $ 604 $ 136 $ 6,256
Schedule of Internal Ratings of Loans	The following summarizes the Company’s internal ratings of its loans held-for-investment, including the year of origination, by portfolio segments, at September 30, 2021 (dollars in millions): September 30, 2021 2020 2019 2018 2017 Prior Revolving Total C&I Risk rating: Pass $ 485 $ 185 $ 62 $ 35 $ 19 $ 12 $ — $ 798 Special mention 2 1 1 1 1 — — 6 Substandard 5 6 2 2 1 — — 16 Doubtful — — — — — — — — Total $ 492 $ 192 $ 65 $ 38 $ 21 $ 12 $ — $ 820 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Municipal Risk rating: Pass $ 22 $ 17 $ 6 $ 22 $ 17 $ 82 $ — $ 166 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 22 $ 17 $ 6 $ 22 $ 17 $ 82 $ — $ 166 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Agricultural Risk rating: Pass $ 51 $ 19 $ 11 $ 6 $ 3 $ 1 $ — $ 91 Special mention — 1 — — — — — 1 Substandard 6 1 — — — — — 7 Doubtful — — — — — — — — Total $ 57 $ 21 $ 11 $ 6 $ 3 $ 1 $ — $ 99 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Construction & Development Risk rating: Pass $ 383 $ 195 $ 37 $ 18 $ 8 $ 8 $ — $ 649 Special mention 3 — — — — — — 3 Substandard 2 1 1 — — — — 4 Doubtful — — — — — — — — Total $ 388 $ 196 $ 38 $ 18 $ 8 $ 8 $ — $ 656 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Farm Risk rating: Pass $ 94 $ 46 $ 16 $ 11 $ 8 $ 25 $ — $ 200 Special mention — — — — — — — — Substandard — 1 — 1 — 1 — 3 Doubtful — — — — — — — — Total $ 94 $ 47 $ 16 $ 12 $ 8 $ 26 $ — $ 203 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 158 $ 156 $ 98 $ 75 $ 35 $ 117 $ — $ 639 Special mention — 1 13 — 7 3 — 24 Substandard 1 — 3 1 3 4 — 12 Doubtful — — — — — — — — Total $ 159 $ 157 $ 114 $ 76 $ 45 $ 124 $ — $ 675 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 193 $ 166 $ 125 $ 99 $ 59 $ 133 $ — $ 775 Special mention 3 — 1 — 1 1 — 6 Substandard 9 3 4 14 3 10 — 43 Doubtful — — — — — — — — Total $ 205 $ 169 $ 130 $ 113 $ 63 $ 144 $ — $ 824 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Residential Risk rating: Pass $ 374 $ 279 $ 126 $ 94 $ 76 $ 245 $ 96 $ 1,290 Special mention 4 4 — 1 1 3 — 13 Substandard 4 3 3 2 2 10 2 26 Doubtful — — — — — — — — Total $ 382 $ 286 $ 129 $ 97 $ 79 $ 258 $ 98 $ 1,329 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Auto Risk rating: Pass $ 174 $ 121 $ 64 $ 21 $ 9 $ 3 $ — $ 392 Special mention — — — — — — — — Substandard — 1 1 — — — — 2 Doubtful — — — — — — — — Total $ 174 $ 122 $ 65 $ 21 $ 9 $ 3 $ — $ 394 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Non-Auto Risk rating: Pass $ 65 $ 27 $ 11 $ 4 $ 2 $ 5 $ 6 $ 120 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 65 $ 27 $ 11 $ 4 $ 2 $ 5 $ 6 $ 120 September 30, 2021 2020 2019 2018 2017 Prior Revolving Total Total Loans Risk rating: Pass $ 1,999 $ 1,211 $ 556 $ 385 $ 236 $ 631 $ 102 $ 5,120 Special mention 12 7 15 2 10 7 — 53 Substandard 27 16 14 20 9 25 2 113 Doubtful — — — — — — — — Total $ 2,038 $ 1,234 $ 585 $ 407 $ 255 $ 663 $ 104 $ 5,286 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, 2021 (dollars in millions): December 31, 2021 2020 2019 2018 2017 Prior Revolving Total C&I Risk rating: Pass $ 526 $ 178 $ 52 $ 29 $ 17 $ 11 $ — $ 813 Special mention 4 1 4 — — — — 9 Substandard 7 4 1 3 — — — 15 Doubtful — — — — — — — — Total $ 537 $ 183 $ 57 $ 32 $ 17 $ 11 $ — $ 837 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Municipal Risk rating: Pass $ 39 $ 15 $ 6 $ 22 $ 17 $ 79 $ — $ 178 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 39 $ 15 $ 6 $ 22 $ 17 $ 79 $ — $ 178 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Agricultural Risk rating: Pass $ 69 $ 8 $ 6 $ 6 $ 3 $ 1 $ — $ 93 Special mention — — — — — — — — Substandard 4 1 — — — — — 5 Doubtful — — — — — — — — Total $ 73 $ 9 $ 6 $ 6 $ 3 $ 1 $ — $ 98 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Construction & Development Risk rating: Pass $ 557 $ 134 $ 24 $ 14 $ 7 $ 8 $ — $ 744 Special mention 2 — — — — — — 2 Substandard 2 2 — — — — — 4 Doubtful — — — — — — — — Total $ 561 $ 136 $ 24 $ 14 $ 7 $ 8 $ — $ 750 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Farm Risk rating: Pass $ 117 $ 42 $ 15 $ 10 $ 7 $ 23 $ — $ 214 Special mention — — — — — — — — Substandard 1 1 — 1 — — — 3 Doubtful — — — — — — — — Total $ 118 $ 43 $ 15 $ 11 $ 7 $ 23 $ — $ 217 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Non-Owner Occupied CRE Risk rating: Pass $ 214 $ 128 $ 77 $ 56 $ 31 $ 84 $ — $ 590 Special mention — 1 12 — 7 3 — 23 Substandard — 1 3 1 3 3 — 11 Doubtful — — — — — — — — Total $ 214 $ 130 $ 92 $ 57 $ 41 $ 90 $ — $ 624 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Owner Occupied CRE Risk rating: Pass $ 250 $ 143 $ 114 $ 90 $ 59 $ 117 $ — $ 773 Special mention 2 2 1 — 1 1 — 7 Substandard 8 2 3 13 5 11 — 42 Doubtful — — — — — — — — Total $ 260 $ 147 $ 118 $ 103 $ 65 $ 129 $ — $ 822 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Residential Risk rating: Pass $ 477 $ 230 $ 115 $ 84 $ 68 $ 222 $ 100 $ 1,296 Special mention 3 4 — 1 1 3 1 13 Substandard 3 3 3 2 2 10 2 25 Doubtful — — — — — — — — Total $ 483 $ 237 $ 118 $ 87 $ 71 $ 235 $ 103 $ 1,334 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Auto Risk rating: Pass $ 218 $ 105 $ 54 $ 17 $ 7 $ 2 $ — $ 403 Special mention 1 — — — — — — 1 Substandard — — 1 — — — — 1 Doubtful — — — — — — — — Total $ 219 $ 105 $ 55 $ 17 $ 7 $ 2 $ — $ 405 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Non-Auto Risk rating: Pass $ 81 $ 22 $ 8 $ 4 $ 1 $ 1 $ 7 $ 124 Special mention — — — — — — — — Substandard — — — — — — — — Doubtful — — — — — — — — Total $ 81 $ 22 $ 8 $ 4 $ 1 $ 1 $ 7 $ 124 December 31, 2021 2020 2019 2018 2017 Prior Revolving Total Total Loans Risk rating: Pass $ 2,548 $ 1,005 $ 471 $ 332 $ 217 $ 548 $ 107 $ 5,228 Special mention 12 8 17 1 9 7 1 55 Substandard 25 14 11 20 10 24 2 106 Doubtful — — — — — — — — Total $ 2,585 $ 1,027 $ 499 $ 353 $ 236 $ 579 $ 110 $ 5,389
Schedule of Past Due Loans	At September 30, 2022 and 2021, and December 31, 2021, the Company’s past due loans are as follows (dollars in thousands): September 30, 2022 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 5,422 $ 73 $ 1,515 $ 7,010 $ 864,325 $ 871,335 $ — Municipal — — — — 214,852 214,852 — Total Commercial 5,422 73 1,515 7,010 1,079,177 1,086,187 — Agricultural 290 93 — 383 76,554 76,937 — Real Estate: Construction & Development 2,958 600 — 3,558 934,493 938,051 — Farm 822 150 — 972 267,167 268,139 — Non-Owner Occupied CRE 536 — — 536 717,202 717,738 — Owner Occupied CRE 1,138 37 — 1,175 944,490 945,665 — Residential 4,834 252 15 5,101 1,531,079 1,536,180 15 Total Real Estate 10,288 1,039 15 11,342 4,394,431 4,405,773 15 Consumer: Auto 267 76 33 376 538,422 538,798 — Non-Auto 66 10 — 76 147,717 147,793 — Total Consumer 333 86 33 452 686,139 686,591 — Total $ 16,333 $ 1,291 $ 1,563 $ 19,187 $ 6,236,301 $ 6,255,488 $ 15 September 30, 2021 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 4,136 $ 516 $ 666 $ 5,318 $ 814,279 $ 819,597 $ 23 Municipal — — — — 165,847 165,847 — Total Commercial 4,136 516 666 5,318 980,126 985,444 23 Agricultural 115 1,074 100 1,289 97,658 98,947 — Real Estate: Construction & Development 4,676 — 114 4,790 651,740 656,530 — Farm 1,182 13 — 1,195 201,869 203,064 — Non-Owner Occupied CRE 800 — — 800 674,158 674,958 — Owner Occupied CRE 260 315 1,537 2,112 822,119 824,231 — Residential 7,807 475 415 8,697 1,320,101 1,328,798 — Total Real Estate 14,725 803 2,066 17,594 3,669,987 3,687,581 — Consumer: Auto 323 43 7 373 393,699 394,072 — Non-Auto 59 3 — 62 120,388 120,450 — Total Consumer 382 46 7 435 514,087 514,522 — Total $ 19,358 $ 2,439 $ 2,839 $ 24,636 $ 5,261,858 $ 5,286,494 $ 23 December 31, 2021 15-59 60-89 Greater Total Past Current Total Loans 90 Days Commercial: C&I $ 3,638 $ 34 $ 222 $ 3,894 $ 833,181 $ 837,075 $ 5 Municipal 63 — — 63 177,842 177,905 — Total Commercial 3,701 34 222 3,957 1,011,023 1,014,980 5 Agricultural 181 — — 181 97,908 98,089 — Real Estate: Construction & Development 2,953 39 — 2,992 746,801 749,793 — Farm 600 215 — 815 216,405 217,220 — Non-Owner Occupied CRE 235 — — 235 623,199 623,434 — Owner Occupied CRE 813 — 280 1,093 820,560 821,653 — Residential 4,984 327 410 5,721 1,328,698 1,334,419 — Total Real Estate 9,585 581 690 10,856 3,735,663 3,746,519 — Consumer: Auto 393 26 — 419 404,997 405,416 — Non-Auto 145 24 3 172 123,796 123,968 3 Total Consumer 538 50 3 591 528,793 529,384 3 Total $ 14,005 $ 665 $ 915 $ 15,585 $ 5,373,387 $ 5,388,972 $ 8
Schedule of Loans Modified and Considered Troubled Debt Restructurings	are as follows (dollars in thousands): Three-Months Ended September 30, 2022 Nine-Months Ended September 30, 2022 Pre- Post- Pre- Post- Recorded Recorded Recorded Recorded Number Investment Investment Number Investment Investment Commercial: C&I 1 $ 205 $ 205 1 $ 205 $ 205 Municipal — — — — — — Total Commercial 1 205 205 1 205 205 Agricultural — — — — — — Real Estate: Construction & Development — — — — — — Farm — — — — — — Non-Owner Occupied CRE — — — — — — Owner Occupied CRE — — — — — — Residential 1 130 130 1 130 130 Total Real Estate 1 130 130 1 130 130 Consumer: Auto — — — Non-Auto — — — Total Consumer — — — — — — Total 2 $ 335 $ 335 2 $ 335 $ 335 Three-Months Ended September 30, 2021 Nine-Months Ended September 30, 2021 Pre- Post- Pre- Post- Recorded Recorded Recorded Recorded Number Investment Investment Number Investment Investment Commercial: C&I — $ — $ — 4 $ 361 $ 361 Municipal — — — — — — Total Commercial — — — 4 361 361 Agricultural — — — 1 68 68 Real Estate: Construction & Development — — — 1 200 200 Farm — — — — — — Non-Owner Occupied CRE — — — — — — Owner Occupied CRE — — — 3 1,047 1,047 Residential 2 77 77 5 519 519 Total Real Estate 2 77 77 9 1,766 1,766 Consumer: Auto 1 19 19 2 51 51 Non-Auto 1 9 9 1 9 9 Total Consumer 2 28 28 3 60 60 Total 4 $ 105 $ 105 17 $ 2,255 $ 2,255
Schedule of How Loans Were Modified as Troubled Debt Restructured Loans	The balances below provide information as to how the loans were modified as troubled debt restructured loans (dollars in thousands): Three-Months Ended September 30, 2022 Nine-Months Ended September 30, 2022 Adjusted Combined Adjusted Combined Interest Maturity Rate and Interest Maturity Rate and Rate Extended Maturity Rate Extended Maturity Commercial: C&I $ — $ — $ 205 $ — $ — $ 205 Municipal — — — — — — Total Commercial — — 205 — — 205 Agricultural — — — — — — Real Estate: Construction & Development — — — — — — Farm — — — — — — Non-Owner Occupied CRE — — — — — — Owner Occupied CRE — — — — — — Residential — — 130 — — 130 Total Real Estate — — 130 — — 130 Consumer: Auto — — — — — — Non-Auto — — — — — — Total Consumer — — — — — — Total $ — $ — $ 335 $ — $ — $ 335 Three-Months Ended September 30, 2021 Nine-Months Ended September 30, 2021 Adjusted Combined Adjusted Combined Interest Maturity Rate and Interest Maturity Rate and Rate Extended Maturity Rate Extended Maturity Commercial: C&I $ — $ — $ — $ — $ 212 $ 149 Municipal — — — — — — Total Commercial — — — — 212 149 Agricultural — — — — 68 — Real Estate: Construction & Development — — — — 200 — Farm — — — — — — Non-Owner Occupied CRE — — — — — — Owner Occupied CRE — — — — — 1,047 Residential — 18 59 — 263 256 Total Real Estate — 18 59 — 463 1,303 Consumer: Auto — — 19 — — 51 Non-Auto — — 9 — — 9 Total Consumer — — 28 — — 60 Total $ — $ 18 $ 87 $ — $ 743 $ 1,512

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Outstanding Notional Balances and Fair Values of Outstanding Derivative Positions	The following tables provide the outstanding notional balances and fair values of outstanding derivative positions (dollars in thousands): September 30, 2022: Outstanding Asset Liability IRLCs $ 78,653 $ — $ 251 Forward mortgage-backed securities trades 72,500 1,897 — September 30, 2021: Outstanding Asset Liability IRLCs $ 141,121 $ 1,701 $ — Forward mortgage-backed securities trades 145,000 828 — December 31, 2021: Outstanding Asset Liability IRLCs $ 85,973 $ 1,279 $ — Forward mortgage-backed securities trades 116,000 — 147

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Schedule of Borrowings	Borrowings consisted of the following (dollars in thousands): September 30, December 31, 2022 2021 2021 Securities sold under agreements with customers to repurchase $ 749,278 $ 612,239 $ 625,499 Federal funds purchased 4,250 36,440 24,600 Other borrowings 21,053 — 21,053 Total $ 774,581 $ 648,679 $ 671,152

Stock Based Compensation (Table

Stock Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Schedule of Changes in Restricted Stock Units	The following table summarizes information about the changes in restricted stock units for the nine-months ended September 30, 2022 and 2021. For the Nine-Months Ended September 30, 2022 2021 Restricted Weighted Restricted Weighted Balance at beginning of period 22,597 $ 48.91 — $ — Grants 24,833 47.19 22,597 48.91 Vesting ( 7,425 ) 48.91 — — Forfeited/expired ( 348 ) 48.91 — — Balance at end of period 39,657 $ 47.83 22,597 $ 48.91 Performance Stock Units
Schedule of Changes in Performance Stock Units	The following table summarizes information about the changes in PSUs as of and for the nine-months ended September 30, 2022 and 2021. For the Nine-Months Ended September 30, 2022 2021 Performance-Based Restricted Weighted Performance-Based Restricted Weighted Balance at beginning of period 22,597 $ 48.91 — $ — Grants 24,833 47.19 22,597 48.91 Vesting — — — — Forfeited/expired ( 348 ) 48.91 — — Balance at end of period 47,082 $ 48.00 22,597 $ 48.91
Summary of Vested and Unvested Restricted Stock Outstanding	The following table summarizes information about vested and unvested restricted stock. For the Nine-Months Ended September 30, 2022 2021 Restricted Weighted Restricted Weighted Balance at beginning of period 46,598 $ 35.75 95,888 $ 29.89 Grants 15,425 40.89 12,110 49.58 Vesting ( 23,898 ) 40.40 ( 31,081 ) 28.42 Forfeited/expired ( 200 ) 29.70 ( 1,389 ) 32.76 Balance at end of period 37,925 $ 34.94 75,528 $ 33.60
Schedule of Analysis of Stock Option Activity	An analysis of stock option activity for the nine-months ended September 30, 2022 is presented in the table and narrative below:​​​​​​​ Shares Weighted- Outstanding, December 31, 2021 1,669,976 $ 25.11 Granted 240,583 47.19 Exercised ( 322,324 ) 18.53 Cancelled ( 54,854 ) 30.26 Outstanding, September 30, 2022 1,533,381 29.77 Exercisable, September 30, 2022 804,219 $ 21.93

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s available-for-sale securities, loans held-for-sale, and derivatives which are measured at fair value on a recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands): September 30, 2022 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 477,176 $ — $ — $ 477,176 Obligations of state and political subdivisions — 2,083,812 — 2,083,812 Corporate bonds — 96,322 — 96,322 Residential mortgage-backed securities — 2,696,881 — 2,696,881 Commercial mortgage-backed securities — 387,346 — 387,346 Other securities 3,906 — — 3,906 Total $ 481,082 $ 5,264,361 $ — $ 5,745,443 Loans held-for-sale $ — $ 15,892 $ — $ 15,892 IRLCs $ — $ ( 251 ) $ — $ ( 251 ) Forward mortgage-backed securities trades $ — $ 1,897 $ — $ 1,897 September 30, 2021 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: Obligations of states and political subdivisions $ — $ 2,665,367 $ — $ 2,665,367 Corporate bonds — 32,984 — 32,984 Residential mortgage-backed securities — 3,028,149 — 3,028,149 Commercial mortgage-backed securities — 389,016 — 389,016 Other securities 4,468 — — 4,468 Total $ 4,468 $ 6,115,516 $ — $ 6,119,984 Loans held-for-sale $ — $ 46,081 $ — $ 46,081 IRLCs $ — $ 1,701 $ — $ 1,701 Forward mortgage-backed securities trades $ — $ 828 $ — $ 828 December 31, 2021 Level 1 Level 2 Level 3 Total Fair Available-for-sale investment securities: U.S. Treasury securities $ 126,841 $ — $ — $ 126,841 Obligations of state and political subdivisions — 2,753,471 — 2,753,471 Corporate bonds — 63,868 — 63,868 Residential mortgage-backed securities — 3,259,449 — 3,259,449 Commercial mortgage-backed securities — 365,120 — 365,120 Other securities 4,430 — — 4,430 Total $ 131,271 $ 6,441,908 $ — $ 6,573,179 Loans held-for-sale $ — $ 34,122 $ — $ 34,122 IRLCs $ — $ 1,279 $ — $ 1,279 Forward mortgage-backed securities trades $ — $ ( 147 ) $ — $ ( 147 )
Summary of Loans Held-for-Sale at Fair Value	The following table summarizes the Company’s loans held-for-sale at fair value and the net unrealized gains as of the balance sheet dates shown below (dollars in thousands): September 30, December 31, 2022 2021 2021 Unpaid principal balance on loans held-for-sale $ 15,998 $ 44,784 $ 33,200 Net unrealized gains (losses) on loans held-for-sale ( 106 ) 1,297 922 Loans held-for-sale at fair value $ 15,892 $ 46,081 $ 34,122
Summary of Gain Loss on Sale of Mortgage Loans	The following table summarizes the Company’s gains on sale and fees of mortgage loans for the three and nine-months ended September 30, 2022 and 2021 (dollars in thousand): Three-Months Ended Nine-Months Ended 2022 2021 2022 2021 Realized gain on sale and fees on mortgage loans* $ 4,664 $ 9,050 $ 16,973 $ 29,245 Change in fair value on loans held-for-sale and IRLCs ( 2,433 ) ( 1,466 ) ( 2,886 ) ( 4,659 ) Change in forward mortgage-backed securities trades 1,839 1,204 2,044 2,387 Total gain on sale of mortgage loans $ 4,070 $ 8,788 $ 16,131 $ 26,973
Schedule of Estimated Fair Values and Carrying Values of All Financial Instruments	The estimated fair values and carrying values of all financial instruments under current authoritative guidance were as follows (dollars in thousands). September 30, December 31, 2022 2021 2021 Carrying Estimated Carrying Estimated Carrying Estimated Fair Value Cash and due from banks $ 227,298 $ 227,298 $ 201,901 $ 201,901 $ 205,053 $ 205,053 Level 1 Interest-bearing demand deposits 138,484 138,484 359,241 359,241 323,535 323,535 Level 1 Available-for-sale securities 5,745,443 5,745,443 6,119,984 6,119,984 6,573,179 6,573,179 Levels 1 Loans held-for-investment, net of 6,181,380 6,215,441 5,223,124 5,236,471 5,325,507 5,335,791 Level 3 Loans held-for-sale 18,815 18,815 47,721 47,748 37,810 37,844 Level 2 Accrued interest receivable 49,416 49,416 43,516 43,516 57,169 57,169 Level 2 Deposits with stated maturities 418,102 416,400 469,867 470,985 461,415 462,312 Level 2 Deposits with no stated maturities 10,724,016 10,724,016 9,423,250 9,423,250 10,105,073 10,105,073 Level 1 Borrowings 774,581 774,581 648,679 648,679 671,152 671,152 Level 2 Accrued interest payable 494 494 294 294 221 221 Level 2 IRLCs ( 251 ) ( 251 ) 1,701 1,701 1,279 1,279 Level 2 Forward mortgage-backed securities 1,897 1,897 828 828 ( 147 ) ( 147 ) Level 2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		7 Months Ended	9 Months Ended		14 Months Ended
	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($) shares	Jul. 27, 2021 shares	Sep. 30, 2022 USD ($) Location shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)
Equity, Class of Treasury Stock [Line Items]
Number of locations | Location				78
Minimum number of shares that company is required to repurchase | shares			0
Amount of allowance for credit loss	$ 0	$ 0		$ 0	$ 0	$ 0	$ 0
Shares repurchased and retired average price | $ / shares						$ 38.61
Minimum number of days to consider the loans as non-accrual				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 gains (losses) in available-for-sale securities, included in accumulated other comprehensive income	(632,421,000)	109,447,000		$ (632,421,000)	109,447,000	$ (632,421,000)	99,253,000
Retained earnings net of tax after transitional charges	$ 1,087,543,000	$ 947,724,000		$ 1,087,543,000	$ 947,724,000	$ 1,087,543,000	981,675,000
First financial antidilutive securities excluded from eps computation | shares	346,000	127,000		272,000	46,000
Shares repurchased under stock repurchase authorization, shares | shares						244,559
Deferred Tax Assets	$ 168,398,000			$ 168,398,000		$ 168,398,000
Deferred Tax Liabilities		$ 27,524,000			$ 27,524,000		24,817,000
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased under stock repurchase authorization, shares | shares	(52,572)			(244,559)
Commitments to Extend Credit [Member]
Equity, Class of Treasury Stock [Line Items]
Reserve for unfunded commitments	$ 10,879,000	6,751,000		$ 10,879,000	6,751,000	10,879,000	6,436,000
Held-to-maturity Securities [Member]
Equity, Class of Treasury Stock [Line Items]
Securities held to maturity	$ 0	$ 0		$ 0	$ 0	$ 0	$ 0
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized to be repurchased | shares			5,000,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Computation of Basic EPS to Dilutive EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net earnings per share, basic, Net Earnings	$ 59,341	$ 58,928	$ 175,807	$ 172,225
Effect of stock options and stock grants, Net Earnings	0	0	0	0
Net earnings per share, diluted, Net Earnings	$ 59,341	$ 58,928	$ 175,807	$ 172,225
Net earnings per share, basic, Weighted Average Shares	142,524,500	142,334,449	142,588,373	142,242,783
Effect of stock options and stock grants, Weighted Average Shares	601,588	884,471	658,395	941,009
Net earnings per share, diluted, Weighted Average Shares	143,126,088	143,218,920	143,246,768	143,183,792
Net earnings per share, basic, Per Share Amount	$ 0.42	$ 0.41	$ 1.23	$ 1.21
Effect of stock options and stock grants, Per Share Amount	(0.01)	0	0	(0.01)
Net earnings per share, diluted, Per Share Amount	$ 0.41	$ 0.41	$ 1.23	$ 1.20

Securities - Additional Informa

Securities - Additional Information (Detail)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) Investment	Sep. 30, 2021 USD ($)	Jun. 30, 2022	Sep. 30, 2022 USD ($) Investment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Interest Bearing Time Deposits In Banks And Securities [Line Items]
INTEREST-BEARING TIME DEPOSITS IN BANKS	$ 0	$ 0		$ 0	$ 0	$ 0
Interest-bearing time deposits, maturity period, years			12 months
Number of investment positions | Investment	1,115			1,115
Securities pledged as collateral	$ 3,447,317,000			$ 3,447,317,000
Sales of investment securities available-for-sale	17,081,000			205,444,000	10,631,000
Gross realized gains from security sales	$ 334,000	$ 1,000		4,357,000	814,000
Gross realized losses from security sales or calls				$ 2,344,000	$ 0
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	55.16%			55.16%
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				72.44%

Securities - Summary of Availab

Securities - Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	$ 6,546,471	$ 6,447,510	$ 5,981,374
Securities available-for-sale, Gross Unrealized Holding Gains	531	149,380	153,068
Securities available-for-sale, Gross Unrealized Holding Losses	(801,559)	(23,711)	(14,458)
Securities available-for-sale, Estimated Fair Value	5,745,443	6,573,179	6,119,984
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	504,457	126,716
Securities available-for-sale, Gross Unrealized Holding Gains	2	125
Securities available-for-sale, Gross Unrealized Holding Losses	(27,283)	0
Securities available-for-sale, Estimated Fair Value	477,176	126,841
Obligations of State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	2,368,605	2,638,369	2,568,224
Securities available-for-sale, Gross Unrealized Holding Gains	514	116,319	103,646
Securities available-for-sale, Gross Unrealized Holding Losses	(285,307)	(1,217)	(6,503)
Securities available-for-sale, Estimated Fair Value	2,083,812	2,753,471	2,665,367
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	3,153,864	3,256,746	2,999,369
Securities available-for-sale, Gross Unrealized Holding Gains	14	23,990	35,950
Securities available-for-sale, Gross Unrealized Holding Losses	(456,997)	(21,287)	(7,170)
Securities available-for-sale, Estimated Fair Value	2,696,881	3,259,449	3,028,149
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	406,530	356,207	375,614
Securities available-for-sale, Gross Unrealized Holding Gains	1	8,914	13,402
Securities available-for-sale, Gross Unrealized Holding Losses	(19,185)	(1)	0
Securities available-for-sale, Estimated Fair Value	387,346	365,120	389,016
Corporate Bonds and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost Basis, Total	113,015	69,472	38,167
Securities available-for-sale, Gross Unrealized Holding Gains	0	32	70
Securities available-for-sale, Gross Unrealized Holding Losses	(12,787)	(1,206)	(785)
Securities available-for-sale, Estimated Fair Value	$ 100,228	$ 68,298	$ 37,452

Securities - Amortized Cost and

Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale, Amortized Cost Basis, Due within one year	$ 239,974
Available-for-Sale, Amortized Cost Basis, Due after one year through five years	2,213,010
Available-for-Sale, Amortized Cost Basis, Due after five years through ten years	2,394,729
Available-for-Sale, Amortized Cost Basis, Due after ten years	1,698,758
Available-for-Sale, Amortized Cost Basis, Total	6,546,471	$ 6,447,510	$ 5,981,374
Available-for-Sale, Estimated Fair Value, Due within one year	238,511
Available-for-Sale, Estimated Fair Value, Due after one year through five years	2,056,408
Available-for-Sale, Estimated Fair Value, Due after five years through ten years	2,051,847
Available-for-Sale, Estimated Fair Value, Due after ten years	1,398,677
Securities available-for-sale, Estimated Fair Value, Total	$ 5,745,443	$ 6,573,179	$ 6,119,984

Securities - Continuous Unreali

Securities - Continuous Unrealized-Loss Position of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value	$ 4,258,183	$ 2,474,964	$ 1,812,030
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	537,139	21,474	13,987
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	1,367,993	89,767	20,762
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	264,420	2,237	471
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	5,626,176	2,564,731	1,832,792
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	801,559	23,711	14,458
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	476,696
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	27,283
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	0
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	476,696
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	27,283
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	1,828,105	163,698	570,916
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	254,212	1,096	6,036
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	139,732	18,943	18,711
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	31,095	122	467
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,967,837	182,641	589,627
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	285,307	1,218	6,503
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	1,507,121	2,263,010	1,208,129
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	231,915	19,742	7,166
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	1,187,815	54,392	2,051
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	225,082	1,544	4
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,694,936	2,317,402	1,210,180
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	456,997	21,286	7,170
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	386,479	820
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	19,185	1
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	0	0
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	386,479	820
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	19,185	1
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	59,782	47,436	32,985
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss, Total	4,544	635	785
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value	40,446	16,432	0
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss	8,243	571	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	100,228	63,868	32,985
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	$ 12,787	$ 1,206	$ 785

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	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	$ 15,455		$ 17,870	$ 16,350
Loans collectively evaluated for credit losses	58,653		45,595	47,020
Total allowance for loan losses	74,108	$ 71,932	63,465	63,370	$ 62,138	$ 66,534
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	8,439		6,627	3,906
Loans collectively evaluated for credit losses	8,000		5,653	6,487
Total allowance for loan losses	16,439	18,589	12,280	10,393	10,186	13,609
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	0
Loans collectively evaluated for credit losses	1,319		348	315
Total allowance for loan losses	1,319	1,352	348	315	588	1,552
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	591		225	164
Loans collectively evaluated for credit losses	25,108		17,402	16,698
Total allowance for loan losses	25,699	21,085	17,627	16,862	15,632	13,512
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	41		2	6
Loans collectively evaluated for credit losses	1,114		661	580
Total allowance for loan losses	1,155	1,006	663	586	607	1,876
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,329		4,059	3,975
Loans collectively evaluated for credit losses	5,866		6,663	6,669
Total allowance for loan losses	8,195	8,410	10,722	10,644	10,432	8,391
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	2,061		3,481	3,481
Loans collectively evaluated for credit losses	8,025		7,347	7,408
Total allowance for loan losses	10,086	10,740	10,828	10,889	10,399	12,347
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	1,640		2,026	2,663
Loans collectively evaluated for credit losses	7,314		6,107	7,394
Total allowance for loan losses	8,954	8,304	8,133	10,057	11,234	12,601
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	3		4	4
Loans collectively evaluated for credit losses	909		892	956
Total allowance for loan losses	912	912	896	960	1,266	1,020
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	1		1	2
Loans collectively evaluated for credit losses	355		370	373
Total allowance for loan losses	356	372	371	375	482	371
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses	350		1,445	2,149
Loans collectively evaluated for credit losses	643		152	140
Total allowance for loan losses	$ 993	$ 1,162	$ 1,597	$ 2,289	$ 1,312	$ 1,255

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		Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		$ 6,255,488		$ 5,388,972	$ 5,286,494
Total Real Estate		24,585		31,652	25,210
Less: Allowance for credit losses		(74,108)	$ (71,932)	(63,465)	(63,370)	$ (62,138)	$ (66,534)
Net loans held for investment		6,181,380		5,325,507	5,223,124
C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		871,335		837,075	819,597
Less: Allowance for credit losses		(16,439)	(18,589)	(12,280)	(10,393)	(10,186)	(13,609)
Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		214,852		177,905	165,847
Less: Allowance for credit losses		(1,319)	(1,352)	(348)	(315)	(588)	(1,552)
Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		938,051		749,793	656,530
Less: Allowance for credit losses		(25,699)	(21,085)	(17,627)	(16,862)	(15,632)	(13,512)
Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		268,139		217,220	203,064
Less: Allowance for credit losses		(1,155)	(1,006)	(663)	(586)	(607)	(1,876)
Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		717,738		623,434	674,958
Less: Allowance for credit losses		(8,195)	(8,410)	(10,722)	(10,644)	(10,432)	(8,391)
Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		945,665		821,653	824,231
Less: Allowance for credit losses		(10,086)	(10,740)	(10,828)	(10,889)	(10,399)	(12,347)
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		1,536,180		1,334,419	1,328,798
Less: Allowance for credit losses		(8,954)	(8,304)	(8,133)	(10,057)	(11,234)	(12,601)
Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		538,798		405,416	394,072
Less: Allowance for credit losses		(912)	(912)	(896)	(960)	(1,266)	(1,020)
Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		147,793		123,968	120,450
Less: Allowance for credit losses		(356)	(372)	(371)	(375)	(482)	(371)
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		1,086,187		1,014,980	985,444
Total Real Estate		5,966		5,370	3,430
Commercial [Member] | C&I [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	[1]	871,335		837,075	819,597
Total Real Estate		5,966		5,370	3,430
Commercial [Member] | Municipal [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		214,852		177,905	165,847
Agriculture [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		76,937		98,089	98,947
Total Real Estate		338		4,920	949
Less: Allowance for credit losses		(993)	$ (1,162)	(1,597)	(2,289)	$ (1,312)	$ (1,255)
Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		4,405,773		3,746,519	3,687,581
Total Real Estate		17,658		20,809	20,146
Real Estate [Member] | Construction & Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		938,051		749,793	656,530
Total Real Estate		1,696		708	1,455
Real Estate [Member] | Farm [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		268,139		217,220	203,064
Total Real Estate		91		1,173	965
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		717,738		623,434	674,958
Total Real Estate		2,406		2,671	2,776
Real Estate [Member] | Owner Occupied CRE [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		945,665		821,653	824,231
Total Real Estate		6,703		7,897	6,551
Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		1,536,180		1,334,419	1,328,798
Total Real Estate		6,762		8,360	8,399
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		686,591		529,384	514,522
Total Real Estate		623		553	685
Consumer [Member] | Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		538,798		405,416	394,072
Total Real Estate		596		514	589
Consumer [Member] | Non-Auto [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		147,793		123,968	120,450
Total Real Estate		$ 27		$ 39	$ 96
[1] All disclosures for the C&I loan segment include PPP loan balances, net of deferred fees and costs, as disclosed on the face of the consolidated balance sheet.

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		Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Receivables [Abstract]
Non-accrual loans		$ 24,585	$ 31,652	$ 25,210
Loans still accruing and past due 90 days or more		15	8	23
Troubled debt restructured loans still accruing	[1]	19	21	22
Total		$ 24,619	$ 31,681	$ 25,255
[1] Troubled debt restructured loans of $ 1,951,000 , $ 4,732,000 and $ 6,721,000 , for which interest collection is doubtful are included in nonaccrual loans as of September 30, 2022 and 2021, and December 31, 2021 , respectively.

Loans Held for Investment and_6

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 (Parenthetical) (Detail) - USD ($)		Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Line Items]
Troubled debt restructured loans still accruing	[1]	$ 19,000	$ 21,000	$ 22,000
Doubtful [Member]
Loans and Leases Receivable Disclosure [Line Items]
Troubled debt restructured loans still accruing		$ 1,951,000	$ 6,721,000	$ 4,732,000
[1] Troubled debt restructured loans of $ 1,951,000 , $ 4,732,000 and $ 6,721,000 , for which interest collection is doubtful are included in nonaccrual loans as of September 30, 2022 and 2021, and December 31, 2021 , respectively.

Loans Held for Investment and_7

Loans Held for Investment and Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) Restructuredloan	Sep. 30, 2021 USD ($) Restructuredloan	Sep. 30, 2022 USD ($) Restructuredloan	Sep. 30, 2021 USD ($) Restructuredloan	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, past due 90 days or more and still accruing, restructured loans and foreclosed assets	$ 24,619,000	$ 25,283,000	$ 24,619,000	$ 25,283,000	$ 34,158,000
Additional funds advanced in connection with impaired loans	0		$ 0
Default for purposes of this disclosure is a troubled debt restructured loan			90 days
Loans held by subsidiaries subject to blanket liens	3,901,376,000		$ 3,901,376,000
Available line of credit	2,258,125,000		2,258,125,000
Line of credit	$ 0	$ 0	$ 0	$ 0	0
Troubled debt restructured loan | Restructuredloan	0	1	0	1
Reserve for unfunded commitments (Other liabilities)	$ 10,879,000	$ 6,751,000	$ 10,879,000	$ 6,751,000	6,436,000
Total Loans	6,255,488,000	$ 5,286,494,000	6,255,488,000	5,286,494,000	$ 5,388,972,000
Provision for Loan and Lease Losses	(1,060,000)		(8,910,000)	4,468,000
Reversal of Provision for credit losses				4,468,000
Federal Home Loan Bank Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Line of credit	0		0
Unfunded Loan Commitment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loan and Lease Losses	2,161,000		4,443,000	1,265,000
Reversal of Provision for credit losses	$ 3,221,000		$ 13,353,000	$ 3,203,000

Loans Held for Investment and_8

Loans Held for Investment and Allowance for Loan Losses - Schedule of Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 24,585	$ 31,652	$ 25,210
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	5,966	5,370	3,430
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	5,966	5,370	3,430
Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	338	4,920	949
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	17,658	20,809	20,146
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	1,696	708	1,455
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	91	1,173	965
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	2,406	2,671	2,776
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	6,703	7,897	6,551
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	6,762	8,360	8,399
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	623	553	685
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	596	514	589
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 27	$ 39	$ 96

Loans Held for Investment and_9

Loans Held for Investment and Allowance for Loan Losses - Changes in Allowance for Loan Losses (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 71,932,000	$ 62,138,000	$ 63,465,000	$ 66,534,000
Provision for loan losses	1,060,000		8,910,000	(4,468,000)
Recoveries	1,409,000	2,707,000	2,960,000	3,745,000
Charge-offs	293,000	(1,475,000)	1,227,000	(2,441,000)
Ending balance	74,108,000	63,370,000	74,108,000	63,370,000
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	18,589,000	10,186,000	12,280,000	13,609,000
Provision for loan losses	(2,378,000)	(31,000)	3,598,000	(3,597,000)
Recoveries	266,000	1,140,000	824,000	1,671,000
Charge-offs	(38,000)	(902,000)	(263,000)	(1,290,000)
Ending balance	16,439,000	10,393,000	16,439,000	10,393,000
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,352,000	588,000	348,000	1,552,000
Provision for loan losses	(33,000)	(273,000)	971,000	(1,237,000)
Recoveries	0		0
Charge-offs	0		0
Ending balance	1,319,000	315,000	1,319,000	315,000
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	21,085,000	15,632,000	17,627,000	13,512,000
Provision for loan losses	4,614,000	1,230,000	8,172,000	3,348,000
Recoveries	0	0	0	2,000
Charge-offs	0		(100,000)
Ending balance	25,699,000	16,862,000	25,699,000	16,862,000
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,006,000	607,000	663,000	1,876,000
Provision for loan losses	149,000	(21,000)	492,000	(1,300,000)
Recoveries	0	0	0	10,000
Charge-offs	0		0
Ending balance	1,155,000	586,000	1,155,000	586,000
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	8,410,000	10,432,000	10,722,000	8,391,000
Provision for loan losses	(498,000)	(344,000)	(3,352,000)	1,609,000
Recoveries	283,000	556,000	825,000	650,000
Charge-offs	0	0	0	(6,000)
Ending balance	8,195,000	10,644,000	8,195,000	10,644,000
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	10,740,000	10,399,000	10,828,000	12,347,000
Provision for loan losses	(1,303,000)	(94,000)	(1,323,000)	(2,044,000)
Recoveries	649,000	806,000	669,000	816,000
Charge-offs	0	(222,000)	(88,000)	(230,000)
Ending balance	10,086,000	10,889,000	10,086,000	10,889,000
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	8,304,000	11,234,000	8,133,000	12,601,000
Provision for loan losses	557,000	(1,184,000)	860,000	(2,542,000)
Recoveries	93,000	7,000	110,000	90,000
Charge-offs	0	0	(149,000)	(92,000)
Ending balance	8,954,000	10,057,000	8,954,000	10,057,000
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	912,000	1,266,000	896,000	1,020,000
Provision for loan losses	72,000	(259,000)	116,000	139,000
Recoveries	47,000	129,000	215,000	305,000
Charge-offs	(119,000)	(176,000)	(315,000)	(504,000)
Ending balance	912,000	960,000	912,000	960,000
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	372,000	482,000	371,000	371,000
Provision for loan losses	67,000	(46,000)	106,000	80,000
Recoveries	53,000	64,000	182,000	172,000
Charge-offs	(136,000)	(125,000)	(303,000)	(248,000)
Ending balance	356,000	375,000	356,000	375,000
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,162,000	1,312,000	1,597,000	1,255,000
Provision for loan losses	(187,000)	1,022,000	(730,000)	1,076,000
Recoveries	18,000	5,000	135,000	29,000
Charge-offs	0	(50,000)	(9,000)	(71,000)
Ending balance	$ 993,000	$ 2,289,000	$ 993,000	$ 2,289,000

Loans Held for Investment an_10

Loans Held for Investment and Allowance for Loan Losses - Schedule of loans that are individually evaluated for credit losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Financing Receivable, Impaired [Line Items]
Related Allowance	$ 15,455	$ 17,870	$ 16,350
Total Recorded Investment	143,717	161,185	165,771
Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	13,428	19,955	15,891
Recorded Investment With Allowance	11,157	11,697	9,319
Related Allowance	4,815	4,184	1,558
Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	10,640	13,686	14,792
Total Recorded Investment	119,132	129,533	140,561
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	8,439	6,627	3,906
Total Recorded Investment	26,881	24,500	22,264
Commercial [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	334	749	1,311
Recorded Investment With Allowance	5,632	4,621	2,119
Related Allowance	4,094	2,533	610
Commercial [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4,345	4,094	3,296
Total Recorded Investment	20,915	19,130	18,834
Commercial [Member] | C&I [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	8,439	6,627	3,906
Total Recorded Investment	26,810	24,391	22,143
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	334	749	1,311
Recorded Investment With Allowance	5,632	4,621	2,119
Related Allowance	4,094	2,533	610
Commercial [Member] | C&I [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4,345	4,094	3,296
Total Recorded Investment	20,844	19,021	18,713
Commercial [Member] | Municipal [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0
Total Recorded Investment	71	109	121
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	71	109	121
Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	350	1,445	2,149
Total Recorded Investment	750	5,398	7,893
Agriculture [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	116	3,026	328
Recorded Investment With Allowance	222	1,894	621
Related Allowance	103	1,086	184
Agriculture [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	247	359	1,965
Total Recorded Investment	412	478	6,944
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	6,662	9,793	10,289
Total Recorded Investment	113,906	129,157	133,411
Real Estate [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	12,978	16,180	14,252
Recorded Investment With Allowance	4,680	4,629	5,894
Related Allowance	617	564	762
Real Estate [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	6,045	9,229	9,527
Total Recorded Investment	96,248	108,348	113,265
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	591	225	164
Total Recorded Investment	7,157	5,473	6,327
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	919	102	1,225
Recorded Investment With Allowance	777	606	230
Related Allowance	207	90	6
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	384	135	158
Total Recorded Investment	5,461	4,765	4,872
Real Estate [Member] | Farm [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	41	2	6
Total Recorded Investment	1,707	3,142	3,105
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0	997	878
Recorded Investment With Allowance	91	176	87
Related Allowance	2		0
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	39	2	6
Total Recorded Investment	1,616	1,969	2,140
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,329	4,059	3,975
Total Recorded Investment	35,365	34,468	36,158
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	2,230	2,543	2,629
Recorded Investment With Allowance	176	128	147
Related Allowance	12	15	16
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,317	4,044	3,959
Total Recorded Investment	32,959	31,797	33,382
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2,061	3,481	3,481
Total Recorded Investment	36,839	48,504	49,332
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	5,700	6,548	5,886
Recorded Investment With Allowance	1,003	1,349	665
Related Allowance	103	152	99
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,958	3,329	3,382
Total Recorded Investment	30,136	40,607	42,781
Real Estate [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,640	2,026	2,663
Total Recorded Investment	32,838	37,570	38,489
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	4,129	5,990	3,634
Recorded Investment With Allowance	2,633	2,370	4,765
Related Allowance	293	307	641
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1,347	1,719	2,022
Total Recorded Investment	26,076	29,210	30,090
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4	5	6
Total Recorded Investment	2,180	2,130	2,203
Consumer [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0
Recorded Investment With Allowance	623	553	685
Related Allowance	1	1	2
Consumer [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3	4	4
Total Recorded Investment	1,557	1,577	1,518
Consumer [Member] | Auto [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3	4	4
Total Recorded Investment	1,692	1,675	1,770
Consumer [Member] | Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0
Recorded Investment With Allowance	596	514	589
Related Allowance	1	1	2
Consumer [Member] | Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	2	3	2
Total Recorded Investment	1,096	1,161	1,181
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1	1	2
Total Recorded Investment	488	455	433
Consumer [Member] | Non-Auto [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0
Recorded Investment With Allowance	27	39	96
Related Allowance	0
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	1	1	2
Total Recorded Investment	$ 461	$ 416	$ 337

Loans Held for Investment an_11

Loans Held for Investment and Allowance for Loan Losses - Schedule of Investment in Loans Related to Balance in Allowance for Loan Losses on Basis of Company's Impairment Methodology (Detail) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		$ 143,717	$ 161,185	$ 165,771
Loans collectively evaluated for credit losses		6,111,771	5,227,787	5,120,723
Total Loans		6,255,488	5,388,972	5,286,494
C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		26,810	24,391	22,143
Loans collectively evaluated for credit losses		844,525	812,684	797,454
Total Loans		871,335	837,075	819,597
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		71	109	121
Loans collectively evaluated for credit losses		214,781	177,796	165,726
Total Loans		214,852	177,905	165,847
Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		7,157	5,473	6,327
Loans collectively evaluated for credit losses		930,894	744,320	650,203
Total Loans		938,051	749,793	656,530
Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		1,707	3,142	3,105
Loans collectively evaluated for credit losses		266,432	214,078	199,959
Total Loans		268,139	217,220	203,064
Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		35,365	34,468	36,158
Loans collectively evaluated for credit losses		682,373	588,966	638,800
Total Loans		717,738	623,434	674,958
Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		36,839	48,504	49,332
Loans collectively evaluated for credit losses		908,826	773,149	774,899
Total Loans		945,665	821,653	824,231
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		32,838	37,570	38,489
Loans collectively evaluated for credit losses		1,503,342	1,296,849	1,290,309
Total Loans		1,536,180	1,334,419	1,328,798
Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		1,692	1,675	1,770
Loans collectively evaluated for credit losses		537,106	403,741	392,302
Total Loans		538,798	405,416	394,072
Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		488	455	433
Loans collectively evaluated for credit losses		147,305	123,513	120,017
Total Loans		147,793	123,968	120,450
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		1,086,187	1,014,980	985,444
Commercial [Member] | C&I [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	[1]	871,335	837,075	819,597
Commercial [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		214,852	177,905	165,847
Agriculture [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for credit losses		750	5,398	7,893
Loans collectively evaluated for credit losses		76,187	92,691	91,054
Total Loans		76,937	98,089	98,947
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		4,405,773	3,746,519	3,687,581
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		938,051	749,793	656,530
Real Estate [Member] | Farm [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		268,139	217,220	203,064
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		717,738	623,434	674,958
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		945,665	821,653	824,231
Real Estate [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		1,536,180	1,334,419	1,328,798
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		686,591	529,384	514,522
Consumer [Member] | Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		538,798	405,416	394,072
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans		$ 147,793	$ 123,968	$ 120,450
[1] All disclosures for the C&I loan segment include PPP loan balances, net of deferred fees and costs, as disclosed on the face of the consolidated balance sheet.

Loans Held-for-Investment and A

Loans Held-for-Investment and Allowance for Loan Losses - Schedule of Company's Internal Ratings of its Loans Held-for-Investment, Including The Year of Origination, by Portfolio Segments (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	$ 2,533	$ 2,585	$ 2,038
2021-2020	1,697	1,027	1,234
2020-2019	712	499	585
2019-2018	336	353	407
2018-2017	238	236	255
Prior	604	579	663
Revolving Loans Amortized Cost Basis	136	110	104
Total	6,256	5,389	5,286
C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	507	537	492
2021-2020	233	183	192
2020-2019	68	57	65
2019-2018	26	32	38
2018-2017	21	17	21
Prior	16	11	12
Revolving Loans Amortized Cost Basis	0
Total	871	837	820
Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	67	39	22
2021-2020	21	15	17
2020-2019	16	6	6
2019-2018	5	22	22
2018-2017	20	17	17
Prior	86	79	82
Revolving Loans Amortized Cost Basis	0
Total	215	178	166
Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	46	73	57
2021-2020	22	9	21
2020-2019	4	6	11
2019-2018	3	6	6
2018-2017	1	3	3
Prior	1	1	1
Revolving Loans Amortized Cost Basis	0
Total	77	98	99
Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	508	561	388
2021-2020	320	136	196
2020-2019	78	24	38
2019-2018	15	14	18
2018-2017	8	7	8
Prior	9	8	8
Revolving Loans Amortized Cost Basis	0
Total	938	750	656
Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	102	118	94
2021-2020	89	43	47
2020-2019	33	15	16
2019-2018	12	11	12
2018-2017	8	7	8
Prior	24	23	26
Revolving Loans Amortized Cost Basis	0
Total	268	217	203
Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	228	214	159
2021-2020	202	130	157
2020-2019	109	92	114
2019-2018	64	57	76
2018-2017	23	41	45
Prior	92	90	124
Revolving Loans Amortized Cost Basis	0
Total	718	624	675
Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	281	260	205
2021-2020	226	147	169
2020-2019	137	118	130
2019-2018	88	103	113
2018-2017	78	65	63
Prior	136	129	144
Revolving Loans Amortized Cost Basis	0
Total	946	822	824
Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	437	483	382
2021-2020	387	237	286
2020-2019	189	118	129
2019-2018	89	87	97
2018-2017	69	71	79
Prior	236	235	258
Revolving Loans Amortized Cost Basis	129	103	98
Total	1,536	1,334	1,329
Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	284	219	174
2021-2020	149	105	122
2020-2019	65	55	65
2019-2018	30	17	21
2018-2017	8	7	9
Prior	3	2	3
Revolving Loans Amortized Cost Basis	0
Total	539	405	394
Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	73	81	65
2021-2020	48	22	27
2020-2019	13	8	11
2019-2018	4	4	4
2018-2017	2	1	2
Prior	1	1	5
Revolving Loans Amortized Cost Basis	7	7	6
Total	148	124	120
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	2,506	2,548	1,999
2021-2020	1,676	1,005	1,211
2020-2019	698	471	556
2019-2018	311	332	385
2018-2017	222	217	236
Prior	566	548	631
Revolving Loans Amortized Cost Basis	133	107	102
Total	6,112	5,228	5,120
Pass [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	495	526	485
2021-2020	226	178	185
2020-2019	65	52	62
2019-2018	24	29	35
2018-2017	18	17	19
Prior	16	11	12
Total	844	813	798
Pass [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	67	39	22
2021-2020	21	15	17
2020-2019	16	6	6
2019-2018	5	22	22
2018-2017	20	17	17
Prior	86	79	82
Total	215	178	166
Pass [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	46	69	51
2021-2020	21	8	19
2020-2019	4	6	11
2019-2018	3	6	6
2018-2017	1	3	3
Prior	1	1	1
Total	76	93	91
Pass [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	504	557	383
2021-2020	317	134	195
2020-2019	78	24	37
2019-2018	15	14	18
2018-2017	8	7	8
Prior	9	8	8
Total	931	744	649
Pass [Member] | Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	101	117	94
2021-2020	89	42	46
2020-2019	33	15	16
2019-2018	12	10	11
2018-2017	8	7	8
Prior	23	23	25
Total	266	214	200
Pass [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	223	214	158
2021-2020	200	128	156
2020-2019	108	77	98
2019-2018	51	56	75
2018-2017	22	31	35
Prior	79	84	117
Total	683	590	639
Pass [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	280	250	193
2021-2020	223	143	166
2020-2019	134	114	125
2019-2018	81	90	99
2018-2017	67	59	59
Prior	124	117	133
Total	909	773	775
Pass [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	433	477	374
2021-2020	382	230	279
2020-2019	183	115	126
2019-2018	87	84	94
2018-2017	68	68	76
Prior	224	222	245
Revolving Loans Amortized Cost Basis	126	100	96
Total	1,503	1,296	1,290
Pass [Member] | Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	284	218	174
2021-2020	149	105	121
2020-2019	64	54	64
2019-2018	29	17	21
2018-2017	8	7	9
Prior	3	2	3
Total	537	403	392
Pass [Member] | Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	73	81	65
2021-2020	48	22	27
2020-2019	13	8	11
2019-2018	4	4	4
2018-2017	2	1	2
Prior	1	1	5
Revolving Loans Amortized Cost Basis	7	7	6
Total	148	124	120
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	1	12	12
2021-2020	6	8	7
2020-2019	5	17	15
2019-2018	16	1	2
2018-2017	0	9	10
Prior	11	7	7
Revolving Loans Amortized Cost Basis		1
Total	39	55	53
Special Mention [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	1	4	2
2021-2020		1	1
2020-2019		4	1
2019-2018	1		1
2018-2017			1
Total	2	9	6
Special Mention [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0
Special Mention [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2021-2020			1
Total			1
Special Mention [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021		2	3
2021-2020	2
Total	2	2	3
Special Mention [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2021-2020	1	1	1
2020-2019		12	13
2019-2018	11
2018-2017		7	7
Prior	7	3	3
Total	19	23	24
Special Mention [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021		2	3
2021-2020	1	2
2020-2019	2	1	1
2019-2018	4
2018-2017	0	1	1
Prior	1	1	1
Total	8	7	6
Special Mention [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021		3	4
2021-2020	2	4	4
2020-2019	3
2019-2018		1	1
2018-2017		1	1
Prior	3	3	3
Revolving Loans Amortized Cost Basis		1
Total	8	13	13
Special Mention [Member] | Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021		1
Total	0	1
Special Mention [Member] | Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	26	25	27
2021-2020	15	14	16
2020-2019	9	11	14
2019-2018	9	20	20
2018-2017	16	10	9
Prior	27	24	25
Revolving Loans Amortized Cost Basis	3	2	2
Total	105	106	113
Substandard [Member] | C&I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	11	7	5
2021-2020	7	4	6
2020-2019	3	1	2
2019-2018	1	3	2
2018-2017	3		1
Total	25	15	16
Substandard [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior			0
Total	0		0
Substandard [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021		4	6
2021-2020	1	1	1
2018-2017			0
Total	1	5	7
Substandard [Member] | Construction & Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	4	2	2
2021-2020	1	2	1
2020-2019			1
Total	5	4	4
Substandard [Member] | Farm [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	1	1
2021-2020		1	1
2019-2018		1	1
Prior	1		1
Total	2	3	3
Substandard [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	5		1
2021-2020	1	1
2020-2019	1	3	3
2019-2018	2	1	1
2018-2017	1	3	3
Prior	6	3	4
Total	16	11	12
Substandard [Member] | Owner Occupied CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	1	8	9
2021-2020	2	2	3
2020-2019	1	3	4
2019-2018	3	13	14
2018-2017	11	5	3
Prior	11	11	10
Total	29	42	43
Substandard [Member] | Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022-2021	4	3	4
2021-2020	3	3	3
2020-2019	3	3	3
2019-2018	2	2	2
2018-2017	1	2	2
Prior	9	10	10
Revolving Loans Amortized Cost Basis	3	2	2
Total	25	25	26
Substandard [Member] | Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2021-2020			1
2020-2019	1	1	1
2019-2018	1
Total	2	$ 1	$ 2
Substandard [Member] | Non-Auto [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 0

Loans Held for Investment an_12

Loans Held for Investment and Allowance for Loan Losses - Schedule of Internal Ratings of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Internal ratings of loan	$ 6,255,488	$ 5,388,972	$ 5,286,494
Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Internal ratings of loan	1,086,187	1,014,980	985,444
Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Internal ratings of loan	76,937	98,089	98,947
Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Internal ratings of loan	4,405,773	3,746,519	3,687,581
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Internal ratings of loan	$ 686,591	$ 529,384	$ 514,522

Loans Held for Investment an_13

Loans Held for Investment and Allowance for Loan Losses - Schedule of Past Due Loans (Detail) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 6,256,000	$ 5,389,000	$ 5,286,000
Total Loans		6,255,488	5,388,972	5,286,494
Total 90 Days Past Due Still Accruing		15	8	23
C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		871,000	837,000	820,000
Total Loans		871,335	837,075	819,597
Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		215,000	178,000	166,000
Total Loans		214,852	177,905	165,847
Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		938,000	750,000	656,000
Total Loans		938,051	749,793	656,530
Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		268,000	217,000	203,000
Total Loans		268,139	217,220	203,064
Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		718,000	624,000	675,000
Total Loans		717,738	623,434	674,958
Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		946,000	822,000	824,000
Total Loans		945,665	821,653	824,231
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,536,000	1,334,000	1,329,000
Total Loans		1,536,180	1,334,419	1,328,798
Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		539,000	405,000	394,000
Total Loans		538,798	405,416	394,072
Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		148,000	124,000	120,000
Total Loans		147,793	123,968	120,450
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		1,086,187	1,014,980	985,444
Total 90 Days Past Due Still Accruing		0	5	23
Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	[1]	871,335	837,075	819,597
Total 90 Days Past Due Still Accruing			5	23
Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		214,852	177,905	165,847
Total 90 Days Past Due Still Accruing		0
Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		76,937	98,089	98,947
Total 90 Days Past Due Still Accruing		0
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		4,405,773	3,746,519	3,687,581
Total 90 Days Past Due Still Accruing		15
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		938,051	749,793	656,530
Total 90 Days Past Due Still Accruing		0
Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		268,139	217,220	203,064
Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		717,738	623,434	674,958
Total 90 Days Past Due Still Accruing		0
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		945,665	821,653	824,231
Total 90 Days Past Due Still Accruing		0
Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		1,536,180	1,334,419	1,328,798
Total 90 Days Past Due Still Accruing		15
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		686,591	529,384	514,522
Total 90 Days Past Due Still Accruing		0	3
Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		538,798	405,416	394,072
Total 90 Days Past Due Still Accruing		0
Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		147,793	123,968	120,450
Total 90 Days Past Due Still Accruing		0	3
15-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	16,333	14,005	19,358
15-59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	5,422	3,701	4,136
15-59 Days Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	5,422	3,638	4,136
15-59 Days Past Due [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]		63
15-59 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	290	181	115
15-59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	10,288	9,585	14,725
15-59 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	2,958	2,953	4,676
15-59 Days Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	822	600	1,182
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	[2]	536	235	800
15-59 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	1,138	813	260
15-59 Days Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	4,834	4,984	7,807
15-59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	333	538	382
15-59 Days Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	267	393	323
15-59 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	66	145	59
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,291	665	2,439
60-89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		73	34	516
60-89 Days Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		73	34	516
60-89 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		93		1,074
60-89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,039	581	803
60-89 Days Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		600	39
60-89 Days Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		150	215	13
60-89 Days Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		37	0	315
60-89 Days Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		252	327	475
60-89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		86	50	46
60-89 Days Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		76	26	43
60-89 Days Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		10	24	3
Greater than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,563	915	2,839
Greater than 90 Days [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,515	222	666
Greater than 90 Days [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,515	222	666
Greater than 90 Days [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due				100
Greater than 90 Days [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		15	690	2,066
Greater than 90 Days [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due				114
Greater than 90 Days [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			280	1,537
Greater than 90 Days [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		15	410	415
Greater than 90 Days [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		33	3	7
Greater than 90 Days [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		33		7
Greater than 90 Days [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			3
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		19,187	15,585	24,636
Total Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		7,010	3,957	5,318
Total Past Due [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		7,010	3,894	5,318
Total Past Due [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	63
Total Past Due [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		383	181	1,289
Total Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		11,342	10,856	17,594
Total Past Due [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,558	2,992	4,790
Total Past Due [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		972	815	1,195
Total Past Due [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		536	235	800
Total Past Due [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,175	1,093	2,112
Total Past Due [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,101	5,721	8,697
Total Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		452	591	435
Total Past Due [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		376	419	373
Total Past Due [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		76	172	62
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		6,236,301	5,373,387	5,261,858
Current [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		214,852
Current [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,079,177	1,011,023	980,126
Current [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		864,325	833,181	814,279
Current [Member] | Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due			177,842	165,847
Current [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		76,554	97,908	97,658
Current [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		4,394,431	3,735,663	3,669,987
Current [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		934,493	746,801	651,740
Current [Member] | Real Estate [Member] | Farm [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		267,167	216,405	201,869
Current [Member] | Real Estate [Member] | Non-Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		717,202	623,199	674,158
Current [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		944,490	820,560	822,119
Current [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,531,079	1,328,698	1,320,101
Current [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		686,139	528,793	514,087
Current [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		538,422	404,997	393,699
Current [Member] | Consumer [Member] | Non-Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 147,717	$ 123,796	$ 120,388
[1] All disclosures for the C&I loan segment include PPP loan balances, net of deferred fees and costs, as disclosed on the face of the consolidated balance sheet. 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 Investment an_14

Loans Held for Investment and Allowance for Loan Losses - Schedule of Loans Modified and Considered Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) Securityloan	Sep. 30, 2021 USD ($) Securityloan	Sep. 30, 2022 USD ($) Securityloan	Sep. 30, 2021 USD ($) Securityloan
Financing Receivable, Modifications [Line Items]
Number | Securityloan		4		17
Pre-Modification Recorded Investment	$ 335	$ 105	$ 335	$ 2,255
Post-Modification Recorded Investment		$ 105		$ 2,255
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan	1		1	4
Pre-Modification Recorded Investment	$ 205		$ 205	$ 361
Post-Modification Recorded Investment	$ 205		$ 205	$ 361
Commercial [Member] | Commercial – C&I [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan	10		1	4
Pre-Modification Recorded Investment	$ 205		$ 205	$ 361
Post-Modification Recorded Investment	$ 205		$ 205	$ 361
Agriculture [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan				1
Pre-Modification Recorded Investment				$ 68
Post-Modification Recorded Investment				$ 68
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan	1	2	1	9
Pre-Modification Recorded Investment	$ 130	$ 77	$ 130	$ 1,766
Post-Modification Recorded Investment	$ 130	$ 77	$ 130	$ 1,766
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan				1
Pre-Modification Recorded Investment				$ 200
Post-Modification Recorded Investment				$ 200
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan				3
Pre-Modification Recorded Investment				$ 1,047
Post-Modification Recorded Investment				$ 1,047
Real Estate [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan	1	2	1	5
Pre-Modification Recorded Investment	$ 130	$ 77	$ 130	$ 519
Post-Modification Recorded Investment	$ 130	$ 77	$ 130	$ 519
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan	2	2	2	3
Pre-Modification Recorded Investment	$ 335	$ 28	$ 335	$ 60
Post-Modification Recorded Investment	$ 335	$ 28	$ 335	$ 60
Consumer [Member] | Auto [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan		1		2
Pre-Modification Recorded Investment		$ 19		$ 51
Post-Modification Recorded Investment		$ 19		$ 51
Consumer [Member] | Non Auto [Member]
Financing Receivable, Modifications [Line Items]
Number | Securityloan		1		1
Pre-Modification Recorded Investment		$ 9		$ 9
Post-Modification Recorded Investment		$ 9		$ 9

Loans Held for Investment an_15

Loans Held for Investment and Allowance for Loan Losses - Schedule of How Loans Were Modified as Troubled Debt Restructured Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	$ 335	$ 105	$ 335	$ 2,255
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	205		205	361
Commercial [Member] | C&I [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	205		205	361
Agriculture [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				68
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	130	77	130	1,766
Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				200
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				1,047
Real Estate [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	130	77	130	519
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	335	28	335	60
Consumer [Member] | Auto [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		19		51
Consumer [Member] | Non Auto [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		9		9
Maturity Extended [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		18		743
Maturity Extended [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				212
Maturity Extended [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				212
Maturity Extended [Member] | Agriculture [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				68
Maturity Extended [Member] | Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		18		463
Maturity Extended [Member] | Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				200
Maturity Extended [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		18		263
Combined Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	205	87	205	1,512
Combined Rate and Maturity [Member] | C&I [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	205		205
Combined Rate and Maturity [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		59
Combined Rate and Maturity [Member] | Non Auto [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		9		9
Combined Rate and Maturity [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				149
Combined Rate and Maturity [Member] | Commercial [Member] | C&I [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				149
Combined Rate and Maturity [Member] | Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		59		1,303
Combined Rate and Maturity [Member] | Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans				1,047
Combined Rate and Maturity [Member] | Real Estate [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans	$ 130		$ 130	256
Combined Rate and Maturity [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		28		60
Combined Rate and Maturity [Member] | Consumer [Member] | Auto [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructured Loans		$ 19		$ 51

Loans Held for Sale - Additiona

Loans Held for Sale - Additional Information (Detail) - USD ($)	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Loans Receivables Held For Sale Net [Abstract]
Loans held for sale	$ 18,815,000	$ 37,810,000	$ 47,721,000
Loans held-for-sale at the lower of cost or fair value	$ 2,923,000	$ 3,688,000	$ 1,640,000

Derivative Financial Instrume_3

Derivative Financial Instruments - Summary of Outstanding Notional Balances and Fair Values of Outstanding Derivative Positions (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
IRLCs [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding Notional Balance	$ 78,653	$ 85,973	$ 141,121
Asset Derivative Fair Value		1,279	1,701
Liability Derivative Fair Value	251	0	0
Forward Mortgage-Backed Securities Trades [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding Notional Balance	72,500	116,000	145,000
Asset Derivative Fair Value	$ 1,897	0	828
Liability Derivative Fair Value		$ 147	$ 0

Borrowings - Schedule of Borrow

Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Debt Disclosure [Abstract]
Securities sold under agreements with customers to repurchase	$ 749,278	$ 625,499	$ 612,239
Federal funds purchased	4,250	24,600	36,440
Other Borrowings	21,053	21,053	0
Total	$ 774,581	$ 671,152	$ 648,679

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Line of Credit Facility [Line Items]
Revolving line of credit, permitted	$ 25,000,000
Line of credit	0	$ 0	$ 0
Other borrowings	$ 21,053,000
Line of credit, maturity date	Jun. 30, 2021
Federal Home Loan Bank Borrowings [Member]
Line of Credit Facility [Line Items]
Line of credit	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Income Taxes [Line Items]
Federal statutory tax rate			21%
Income tax expense	$ 12,095,000	$ 11,641,000	$ 34,359,000	$ 33,770,000
Effective tax rates on pre-tax income	16.93%	16.50%	16.35%	16.39%
Initial capital contribution commitment			$ 5,500,000
Initial contribution included in other assets			131,000		$ 55,000
Leveraged loan, invest in other borrowings	$ 21,053,000		$ 21,053,000
Investment related liabilities		$ 0		$ 0
NMTC Investments [Member]
Income Taxes [Line Items]
Tax Benefit Percent of Qualified Investments			0.39
Investment related liabilities	0		$ 0
FFB Paris Investment Fund, LLC [Member]
Income Taxes [Line Items]
Initial contribution included in other assets			29,000,000		29,000,000
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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	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			$ 15.43
Stock options outstanding, exercise price range, upper			$ 48.91
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan	$ 5,915,000		$ 5,915,000
Weighted-average period of unrecognized compensation cost recognition, years			2 years 14 days
Total fair value of shares vested			$ 1,747,000	$ 1,246,000
Stock compensation expense	360,000	$ 296,000	992,000	987,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement amount in assets	50,000,000,000		50,000,000,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement amount in assets	$ 10,000,000,000		$ 10,000,000,000
Two Thousand Twenty One Omnibus Stock and Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock for issuance under the plan	1,877,004		1,877,004			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	$ 72,000	72,000	$ 72,000	72,000	$ 52,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vested			1,363,000	1,534,000
Restricted Stock [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	150,000	150,000	481,000	450,000
Restricted Stock [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	370,000	347,000	$ 1,390,000	926,000
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] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	370,000	347,000	$ 1,390,000	926,000
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	4,105,000	3,556,000	$ 4,105,000	$ 3,556,000
Weighted-average period of unrecognized compensation cost recognition, years			1 year 2 months 23 days	1 year 5 months 26 days
Restricted Stock Units [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 370,000	$ 347,000	$ 1,390,000	$ 926,000

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Changes in Stock Units (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	46,598	95,888
Grants	15,425	12,110
Vesting	(23,898)	(31,081)
Forfeited/expired	(200)	(1,389)
Balance at end of period	37,925	75,528
Balance at beginning of period	$ 35.75	$ 29.89
Weighted Average Grant Date Fair Value, Grants	40.89	49.58
Weighted Average Grant Date Fair Value, Vesting	40.40	28.42
Weighted Average Grant Date Fair Value, Forfeited/expired	29.70	32.76
Balance at end of period	$ 34.94	$ 33.60
Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	22,597	0
Grants	24,833	22,597
Vesting	(7,425)	0
Forfeited/expired	(348)	0
Balance at end of period	39,657	22,597
Balance at beginning of period	$ 48.91	$ 0
Weighted Average Grant Date Fair Value, Grants	47.19	48.91
Weighted Average Grant Date Fair Value, Vesting	48.91	0
Weighted Average Grant Date Fair Value, Forfeited/expired	48.91	0
Balance at end of period	$ 47.83	$ 48.91
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	22,597
Grants	24,833	22,597
Forfeited/expired	(348)
Balance at end of period	47,082	22,597
Balance at beginning of period	$ 48.91
Weighted Average Grant Date Fair Value, Grants	47.19	$ 48.91
Weighted Average Grant Date Fair Value, Forfeited/expired	48.91
Balance at end of period	$ 48	$ 48.91

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Vested and Unvested Restricted Stock Outstanding (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Share-Based Payment Arrangement [Abstract]
Balance at beginning of period	46,598	95,888
Grants	15,425	12,110
Vesting	(23,898)	(31,081)
Forfeited/expired	(200)	(1,389)
Balance at end of period	37,925	75,528
Balance at beginning of period	$ 35.75	$ 29.89
Grants	40.89	49.58
Vesting	40.40	28.42
Forfeited/expired	29.70	32.76
Balance at end of period	$ 34.94	$ 33.60

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of Analysis of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2022 $ / shares shares
Share-Based Payment Arrangement [Abstract]
Outstanding, beginning of year, Shares | shares	1,669,976
Shares, Granted | shares	240,583
Exercised, Shares | shares	(322,324)
Cancelled, Shares | shares	54,854
Outstanding, end of year, Shares | shares	1,533,381
Exercisable at end of year, Shares | shares	804,219
Outstanding, beginning of year, Weighted-Average Ex. Price | $ / shares	$ 25.11
Granted, Weighted-Average Ex. Price | $ / shares	47.19
Exercised, Weighted-Average Ex. Price | $ / shares	18.53
Cancelled, Weighted-Average Ex. Price | $ / shares	30.26
Outstanding, end of year, Weighted-Average Ex. Price | $ / shares	29.77
Exercisable at end of year, Weighted-Average Ex. Price | $ / shares	$ 21.93

Fair Value Disclosures - Additi

Fair Value Disclosures - Additional Information (Detail)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) Loans	Sep. 30, 2021 USD ($) Loans	Dec. 31, 2021 USD ($) 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	$ 0	0	28,000	$ 0
Real state owned	0	$ 0	$ 296,000
Residential Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of loans held-for-sale | Loans		0	0	0
Recognized credit losses	$ 0	$ 0	$ 0
Minimum [Member] | Measurement Input, Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt discounts, percentage	5	5
Maximum [Member] | Measurement Input, Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt discounts, percentage	25	25

Fair Value Disclosures - Financ

Fair Value Disclosures - Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	$ 5,745,443,000	$ 6,573,179,000	$ 6,119,984,000
Loans held for sale	18,815,000	37,810,000	47,721,000
U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	477,176,000	126,841,000
Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	2,083,812,000	2,753,471,000	2,665,367,000
Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	2,696,881,000	3,259,449,000	3,028,149,000
Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	387,346,000	365,120,000	389,016,000
IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value		1,279,000	1,701,000
Liability Derivative Fair Value	251,000	0	0
Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	1,897,000	0	828,000
Liability Derivative Fair Value		147,000	0
Fair Value, Measurements, Recurring [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	5,745,443,000	6,573,179,000	6,119,984,000
Loans held for sale	15,892,000	34,122,000	46,081,000
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	477,176,000	126,841,000
Fair Value, Measurements, Recurring [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	2,083,812,000	2,753,471,000	2,665,367,000
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	2,696,881,000	3,259,449,000	3,028,149,000
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	387,346,000	365,120,000	389,016,000
Fair Value, Measurements, Recurring [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	(251,000)	1,279,000	1,701,000
Fair Value, Measurements, Recurring [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Liability Derivative Fair Value	1,897,000	(147,000)	828,000
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	96,322,000	63,868,000	32,984,000
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	3,906,000	4,430,000	4,468,000
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	481,082,000	131,271,000	4,468,000
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:
Securities available-for-sale, Estimated Fair Value	477,176,000	126,841,000
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Liability Derivative Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Other Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	3,906,000	4,430,000	4,468,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	5,264,361,000	6,441,908,000	6,115,516,000
Loans held for sale	15,892,000	34,122,000	46,081,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	2,083,812,000	2,753,471,000	2,665,367,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	2,696,881,000	3,259,449,000	3,028,149,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	387,346,000	365,120,000	389,016,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	(251,000)	1,279,000	1,701,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Liability Derivative Fair Value	1,897,000	(147,000)	(828,000)
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	96,322,000	63,868,000	32,984,000
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Other Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Loans held for sale	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | U.S. Treasury Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Obligations of State and Political Subdivisions [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Commercial Mortgage-Backed Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | IRLCs [Member]
Available-for-sale investment securities:
Asset Derivative Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Available-for-sale investment securities:
Liability Derivative Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Corporate Bonds [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	0	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 Inputs [Member] | Other Securities [Member]
Available-for-sale investment securities:
Securities available-for-sale, Estimated Fair Value	$ 0	$ 0	$ 0

Fair Value Disclosures - Summar

Fair Value Disclosures - Summary of Loans Held-for-Sale at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Fair Value Measurements Loans Held For Sale [Abstract]
Unpaid principal balance on loans held-for-sale	$ 15,998	$ 33,200	$ 44,784
Net unrealized gains (losses) on loans held-for-sale	(106)	922	1,297
Loans held-for-sale at fair value	$ 15,892	$ 34,122	$ 46,081

Fair Value Disclosures - Schedu

Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 4,664	$ 9,050	$ 16,973	$ 29,245
Change in fair value on loans held-for-sale and IRLCs		(2,433)	1,466	(2,886)	(4,659)
Change in forward mortgage-backed securities trades		1,839	(1,204)	2,044	2,387
Total gain on sale of mortgage loans		$ 4,070	$ 8,788	$ 16,131	$ 26,973
[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 ($)	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 227,298,000	$ 205,053,000	$ 201,901,000
Interest-Bearing Deposits in Banks and Other Financial Institutions	138,484,000	323,535,000	359,241,000
Securities available-for-sale, Estimated Fair Value	5,745,443,000	6,573,179,000	6,119,984,000
Loans held-for-investment, net of allowance for credit losses	6,181,380,000	5,325,507,000	5,223,124,000
Loans held for sale	18,815,000	37,810,000	47,721,000
Borrowings	774,581,000	671,152,000	648,679,000
IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset Derivative Fair Value		1,279,000	1,701,000
Liability Derivative Fair Value	251,000	0	0
Forward Mortgage-Backed Securities Trades [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset Derivative Fair Value	1,897,000	0	828,000
Liability Derivative Fair Value		147,000	0
Carrying Value [Member] | Level 1 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	227,298,000	205,053,000	201,901,000
Interest-Bearing Deposits in Banks and Other Financial Institutions	138,484,000	323,535,000	359,241,000
Deposits with no stated maturities	10,724,016,000	10,105,073,000	9,423,250,000
Carrying Value [Member] | Level 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	18,815,000	37,810,000	47,721,000
Accrued interest receivable	49,416,000	57,169,000	43,516,000
Deposits with stated maturities	418,102,000	461,415,000	469,867,000
Borrowings	774,581,000	671,152,000	648,679,000
Accrued interest payable	494,000	221,000	294,000
Carrying Value [Member] | Level 2 Inputs [Member] | IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset Derivative Fair Value	(251,000)	1,279,000	1,701,000
Carrying Value [Member] | Level 2 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability Derivative Fair Value	1,897,000	(147,000)	(828,000)
Carrying Value [Member] | Levels 1 and 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, Estimated Fair Value	5,745,443,000	6,573,179,000	6,119,984,000
Carrying Value [Member] | Level 3 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-investment, net of allowance for credit losses	6,181,380,000	5,325,507,000	5,223,124,000
Estimated Fair Value [Member] | Level 1 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	227,298,000	205,053,000	201,901,000
Interest-Bearing Deposits in Banks and Other Financial Institutions	138,484,000	323,535,000	359,241,000
Deposits with no stated maturities	10,724,016,000	10,105,073,000	9,423,250,000
Estimated Fair Value [Member] | Level 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	18,815,000	37,844,000	47,748,000
Accrued interest receivable	49,416,000	57,169,000	43,516,000
Deposits with stated maturities	416,400,000	462,312,000	470,985,000
Borrowings	774,581,000	671,152,000	648,679,000
Accrued interest payable	494,000	221,000	294,000
Estimated Fair Value [Member] | Level 2 Inputs [Member] | IRLCs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset Derivative Fair Value	(251,000)	1,279,000	1,701,000
Estimated Fair Value [Member] | Level 2 Inputs [Member] | Forward Mortgage-Backed Securities Trades [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability Derivative Fair Value	1,897,000	(147,000)	(828,000)
Estimated Fair Value [Member] | Levels 1 and 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, Estimated Fair Value	5,745,443,000	6,573,179,000	6,119,984,000
Estimated Fair Value [Member] | Level 3 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-investment, net of allowance for credit losses	$ 6,215,441,000	$ 5,335,791,000	$ 5,236,471,000