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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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 24,640		$ 24,640		$ 27,267
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	39,102		39,102		48,543
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	21,317	$ 34,035	22,383	$ 33,846
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(118)	33	(162)	12
Impaired Financing Receivable, with Related Allowance, Recorded Investment	32,479		32,479		12,205
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	35,102		35,102		13,778
Related allowance	10,911		10,911		4,549
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24,617	12,882	19,027	9,186
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	(8)	0	(8)	0
Recorded investment	57,119		57,119		39,472
Unpaid principal balance	74,204		74,204		62,321
Impaired Financing Receivable, Average Recorded Investment	45,934	46,917	41,410	43,032
Impaired Financing Receivable, Interest Income, Cash Basis Method	(126)	33	(170)	12
Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,634		3,634		4,369
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	16,474		16,474		18,014
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,764	4,416	5,153	4,444
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	10	0	10
Impaired Financing Receivable, with Related Allowance, Recorded Investment	10,133		10,133		5,691
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,036		11,036		6,787
Related allowance	6,199		6,199		4,044
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,014	11,445	4,585	8,056
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	(8)	0	(8)	0
Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,869		5,869		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	8,327		8,327		7,042
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	9,974		9,974		8,763
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,169	6,312	7,943	6,190
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(105)	(19)	(113)	(40)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,249		1,249		1,531
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,418		1,418		1,697
Related allowance	140		140		118
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,249	1,237	1,249	1,030
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	6,682		6,682		12,402
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,565		6,565		18,219
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,102	22,853	5,426	22,769
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(11)	43	(46)	43
Impaired Financing Receivable, with Related Allowance, Recorded Investment	21,097		21,097		4,983
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	22,648		22,648		5,294
Related allowance	4,572		4,572		387
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	17,354	200	13,193	100
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	128		128		166
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	220		220		259
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	134	454	143	443
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(2)	(1)	(3)	(1)
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	4,148	0	3,718	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
Time and Demand Loans | Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,907		2,907		3,527
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,747		15,747		17,172
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,959	4,332	4,366	4,283
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	10	0	10
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,873		9,873		5,691
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10,776		10,776		6,787
Related allowance	6,114		6,114		4,044
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,927	11,445	4,542	8,056
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	(8)	0	(8)	0
Senior Lien | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,043		5,043		4,161
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,952		5,952		5,151
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,855	3,584	4,708	3,510
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(102)	(19)	(110)	(40)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		282
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		279
Related allowance	0		0		39
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
Junior Lien | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,284		3,284		2,881
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,022		4,022		3,612
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,314	2,728	3,235	2,680
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(3)	0	(3)	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,249		1,249		1,249
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,418		1,418		1,418
Related allowance	140		140		79
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,249	1,237	1,249	1,030
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	47		47		55
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	52		52		58
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	48	23	50	11
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	3,923		3,923		10,971
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,687		3,687		17,092
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,890	20,527	2,513	20,565
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(1)	(4)	(3)	(4)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	19,303		19,303		3,311
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	20,729		20,729		3,550
Related allowance	3,624		3,624		174
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	15,785	0	12,223	0
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	2,712		2,712		1,376
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,826		2,826		1,069
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,164	2,303	2,863	2,193
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(10)	47	(43)	47
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,794		1,794		1,672
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,919		1,919		1,744
Related allowance	948		948		213
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,569	200	970	100
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Automobiles | Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	126		126		164
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	218		218		257
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	132	353	141	355
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	(2)	(1)	(3)	(1)
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	2		2		2
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2	101	2	88
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	5,869		5,869		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	4,148	0	3,718	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
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	727		727		842
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	727		727		842
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	805	84	787	161
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	260		260		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	260		260		0
Related allowance	85		85		$ 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	87	0	43	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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