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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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 39,472	$ 35,487
Unpaid Principal Balance	62,321	46,433
Related Allowance	4,549	711
Average Recorded Investment	44,923	36,490	$ 47,071
Interest Income Recognized	530	594	898
Commercial Financial Agricultural And Other With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,369	3,141
Unpaid Principal Balance	18,014	9,555
Average Recorded Investment	7,895	3,751	9,240
Interest Income Recognized	143	157	389
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Time and demand loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,527	3,141
Unpaid Principal Balance	17,172	9,555
Average Recorded Investment	7,569	3,751	9,240
Interest Income Recognized	143	157	389
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Equipment Finance
Financing Receivable, Impaired [Line Items]
Recorded Investment	842	0
Unpaid Principal Balance	842	0
Average Recorded Investment	326	0
Interest Income Recognized	0	0
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Time and Demand Loans Other
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Real Estate Construction With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,288	0
Unpaid Principal Balance	3,288	0
Average Recorded Investment	1,096	0	53
Interest Income Recognized	0	0	0
Real Estate Construction With No Related Allowance [Member] | Construction Other
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,288	0
Unpaid Principal Balance	3,288	0
Average Recorded Investment	1,096	0
Interest Income Recognized	0	0
Real Estate Construction With No Related Allowance [Member] | Construction Residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Residential real estate with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,042	9,145
Unpaid Principal Balance	8,763	11,010
Average Recorded Investment	6,440	9,040	10,315
Interest Income Recognized	136	241	375
Residential real estate with no related allowance recorded [Member] | Senior Lien
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,161	5,754
Unpaid Principal Balance	5,151	6,848
Average Recorded Investment	3,760	5,280	5,674
Interest Income Recognized	129	172	279
Residential real estate with no related allowance recorded [Member] | Junior Lien
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,881	3,391
Unpaid Principal Balance	3,612	4,162
Average Recorded Investment	2,680	3,760	4,641
Interest Income Recognized	7	69	96
Commercial Real Estate With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,402	21,505
Unpaid Principal Balance	18,219	24,119
Average Recorded Investment	20,715	22,983	26,235
Interest Income Recognized	260	172	119
Commercial Real Estate With No Related Allowance [Member] | Multifamily
Financing Receivable, Impaired [Line Items]
Recorded Investment	55	0
Unpaid Principal Balance	58	0
Average Recorded Investment	37	172	1,223
Interest Income Recognized	0	43	0
Commercial Real Estate With No Related Allowance [Member] | Nonowner Occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,971	20,155
Unpaid Principal Balance	17,092	22,565
Average Recorded Investment	18,454	21,304	22,668
Interest Income Recognized	122	104	28
Commercial Real Estate With No Related Allowance [Member] | Owner Occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,376	1,350
Unpaid Principal Balance	1,069	1,554
Average Recorded Investment	2,224	1,507	2,344
Interest Income Recognized	138	25	91
Loans To Individuals With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	166	528
Unpaid Principal Balance	259	563
Average Recorded Investment	365	455	479
Interest Income Recognized	7	16	15
Loans To Individuals With No Related Allowance [Member] | Automobiles
Financing Receivable, Impaired [Line Items]
Recorded Investment	164	440
Unpaid Principal Balance	257	475
Average Recorded Investment	299	378	425
Interest Income Recognized	7	16	15
Loans To Individuals With No Related Allowance [Member] | Other consumer loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	2	88
Unpaid Principal Balance	2	88
Average Recorded Investment	66	77	54
Interest Income Recognized	0	0	0
Subtotal with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	27,267	34,319
Unpaid Principal Balance	48,543	45,247
Average Recorded Investment	36,511	36,229	46,322
Interest Income Recognized	546	586	898
Commercial, financial, agricultural and other With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,691	1,168
Unpaid Principal Balance	6,787	1,186
Related Allowance	4,044	711
Average Recorded Investment	6,574	261	84
Interest Income Recognized	(16)	8	0
Commercial, financial, agricultural and other With an allowance recorded [Member] | Time and demand loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,691	1,168
Unpaid Principal Balance	6,787	1,186
Related Allowance	4,044	711
Average Recorded Investment	6,574	261	84
Interest Income Recognized	(16)	8	0
Commercial, financial, agricultural and other With an allowance recorded [Member] | Equipment Finance
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Commercial, financial, agricultural and other With an allowance recorded [Member] | Time and Demand Loans Other
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Real estate construction with an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Real estate construction with an allowance recorded [Member] | Construction Other
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Real estate construction with an allowance recorded [Member] | Construction Residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Residential real estate With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,531	0
Unpaid Principal Balance	1,697	0
Related Allowance	118	0
Average Recorded Investment	1,183	0	0
Interest Income Recognized	0	0	0
Residential real estate With an allowance recorded [Member] | Senior Lien
Financing Receivable, Impaired [Line Items]
Recorded Investment	282	0
Unpaid Principal Balance	279	0
Related Allowance	39	0
Average Recorded Investment	47	0	0
Interest Income Recognized	0	0	0
Residential real estate With an allowance recorded [Member] | Junior Lien
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,249	0
Unpaid Principal Balance	1,418	0
Related Allowance	79	0
Average Recorded Investment	1,136	0	0
Interest Income Recognized	0	0	0
Commercial real estate With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,983	0
Unpaid Principal Balance	5,294	0
Related Allowance	387	0
Average Recorded Investment	655	0	665
Interest Income Recognized	0	0	0
Commercial real estate With an allowance recorded [Member] | Multifamily
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0	444
Interest Income Recognized	0	0	0
Commercial real estate With an allowance recorded [Member] | Nonowner Occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,311	0
Unpaid Principal Balance	3,550	0
Related Allowance	174	0
Average Recorded Investment	397	0	0
Interest Income Recognized	0	0	0
Commercial real estate With an allowance recorded [Member] | Owner Occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,672	0
Unpaid Principal Balance	1,744	0
Related Allowance	213	0
Average Recorded Investment	258	0	221
Interest Income Recognized	0	0	0
Loans to individuals With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Loans to individuals With an allowance recorded [Member] | Automobiles
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Loans to individuals With an allowance recorded [Member] | Other consumer loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Subtotal With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,205	1,168
Unpaid Principal Balance	13,778	1,186
Related Allowance	4,549	711
Average Recorded Investment	8,412	261	749
Interest Income Recognized	$ (16)	$ 8	$ 0

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