Loans and Leases - Non-Performing Loans and Leases (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Non-Performing Loans and Leases [Line Items]
Nonaccrual loans and leases	$ 13,353,000	$ 33,210,000
Accruing troubled debt restructured loans and lease modifications	49,000	51,000
Loans and leases 90 days or more past due and accruing interest	875,000	498,000
Total Nonperforming Loans and Leases	14,277,000	33,759,000
Nonaccrual troubled debt restructured loans and lease modifications	767,000	758,000
Commercial, Financial and Agricultural [Member]
Non-Performing Loans and Leases [Line Items]
Nonaccrual loans and leases	5,072,000	448,000
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and leases 90 days or more past due and accruing interest	0	0
Total Nonperforming Loans and Leases	5,072,000	448,000
Real Estate-Commercial [Member]
Non-Performing Loans and Leases [Line Items]
Nonaccrual loans and leases	4,537,000	27,900,000
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and leases 90 days or more past due and accruing interest	20,000	0
Total Nonperforming Loans and Leases	4,557,000	27,900,000
Real Estate-Residential Secured for Business Purpose [Member]
Non-Performing Loans and Leases [Line Items]
Nonaccrual loans and leases	1,013,000	2,187,000
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and leases 90 days or more past due and accruing interest	263,000	216,000
Total Nonperforming Loans and Leases	1,276,000	2,403,000
Real Estate-Residential Secured for Personal Purpose [Member]
Non-Performing Loans and Leases [Line Items]
Nonaccrual loans and leases	1,989,000	2,049,000
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and leases 90 days or more past due and accruing interest	319,000	0
Total Nonperforming Loans and Leases	2,308,000	2,049,000
Real Estate-Home Equity Secured for Personal Purpose [Member]
Non-Performing Loans and Leases [Line Items]
Nonaccrual loans and leases	740,000	545,000
Accruing troubled debt restructured loans and lease modifications	49,000	51,000
Loans and leases 90 days or more past due and accruing interest	0	0
Total Nonperforming Loans and Leases	789,000	596,000
Loans to Individuals [Member]
Non-Performing Loans and Leases [Line Items]
Nonaccrual loans and leases	0	0
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and leases 90 days or more past due and accruing interest	39,000	180,000
Total Nonperforming Loans and Leases	39,000	180,000
Lease Financings [Member]
Non-Performing Loans and Leases [Line Items]
Nonaccrual loans and leases	2,000	81,000
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and leases 90 days or more past due and accruing interest	234,000	102,000
Total Nonperforming Loans and Leases	$ 236,000	$ 183,000