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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 27,743		$ 27,743		$ 27,267
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	43,031		43,031		48,543
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	30,077	$ 18,204	27,454	$ 20,244
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(33)	(389)	(194)	(393)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	46,980		46,980		12,205
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	49,407		49,407		13,778
Related allowance	14,274		14,274		4,549
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	33,800	29,730	21,445	24,423
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	(261)	0	(270)	(16)
Recorded investment	74,723		74,723		39,472
Unpaid principal balance	92,438		92,438		62,321
Impaired Financing Receivable, Average Recorded Investment	63,877	47,934	48,899	44,667
Impaired Financing Receivable, Interest Income, Cash Basis Method	(294)	(389)	(464)	(377)
Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,631		3,631		4,369
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	16,697		16,697		18,014
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,252	2,509	5,720	3,974
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(10)	(135)	(10)	(141)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	11,778		11,778		5,691
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,886		12,886		6,787
Related allowance	6,534		6,534		4,044
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,816	14,980	5,128	10,190
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	(28)	0	(37)	(16)
Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,817		5,817		3,288
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,869		5,869		3,288
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,669		8,669		7,042
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	10,357		10,357		8,763
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,781	6,290	8,223	6,224
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(4)	(35)	(117)	(75)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,554		1,554		1,531
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,723		1,723		1,697
Related allowance	249		249		118
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,351	1,236	1,283	1,099
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,524		9,524		12,402
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	9,951		9,951		18,219
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,089	7,908	8,951	9,253
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(17)	(213)	(62)	(170)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	33,648		33,648		4,983
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	34,798		34,798		5,294
Related allowance	7,491		7,491		387
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24,633	13,514	15,034	13,134
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	(233)	0	(233)	0
Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	102		102		166
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	157		157		259
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	121	401	136	428
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(2)	(6)	(5)	(7)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Real estate construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,834	1,096	4,424	365
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Time and Demand Loans | Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,324		2,324		3,527
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,390		15,390		17,172
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,770	2,269	4,673	3,786
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(10)	(135)	(10)	(141)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	11,365		11,365		5,691
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,473		12,473		6,787
Related allowance	6,397		6,397		4,044
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,679	14,980	5,083	10,190
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	(28)	0	(37)	(16)
Senior Lien | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,351		5,351		4,161
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,290		6,290		5,151
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,420	3,784	4,946	3,602
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(4)	(34)	(114)	(74)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	293		293		282
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	293		293		279
Related allowance	44		44		39
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	98	0	33	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Junior Lien | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,318		3,318		2,881
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,067		4,067		3,612
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,361	2,506	3,277	2,622
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	(1)	(3)	(1)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,261		1,261		1,249
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,430		1,430		1,418
Related allowance	205		205		79
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,253	1,236	1,250	1,099
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Multifamily | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	21		21		55
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	21		21		58
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	14	68	38	30
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,236		7,236		10,971
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,419		7,419		17,092
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	7,593	6,498	6,177	7,313
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(17)	(53)	(20)	(57)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	28,078		28,078		3,311
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	29,050		29,050		3,550
Related allowance	6,686		6,686		174
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	20,406	12,601	12,979	12,763
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Owner Occupied Commercial Real Estate | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,267		2,267		1,376
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,511		2,511		1,069
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,482	1,342	2,736	1,910
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	(160)	(42)	(113)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,570		5,570		1,672
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,748		5,748		1,744
Related allowance	805		805		213
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4,227	913	2,055	371
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	(233)	0	(233)	0
Automobiles | Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	100		100		164
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	141		141		257
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	119	315	134	341
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(2)	(6)	(5)	(7)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Other Consumer Loans | Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2		2		2
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	16		16		2
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2	86	2	87
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Construction Residential | Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Construction Residential | Real estate construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Construction Other | Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,817		5,817		3,288
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,869		5,869		3,288
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Construction Other | Real estate construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,834	1,096	4,424	365
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Time and Demand Loans Other | Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Equipment Finance | Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,307		1,307		842
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,307		1,307		842
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,482	240	1,047	188
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	413		413		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	413		413		0
Related allowance	137		137		$ 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	137	0	45	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	$ 0	$ 0	$ 0	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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