Federal Home Loan Bank Advances and Other Borrowings - Additional Information (Detail) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Federal Reserve Bank of Atlanta [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 6,000,000	$ 5,700,000
Line of credit facility, current borrowing capacity	0	0
Bank's residential and commercial real estate loans [Member]
Line of Credit Facility [Line Items]
Debt instrument, collateral amount	45,500,000	15,700,000
Line of credit facility, maximum borrowing capacity	45,500,000	15,700,000
Bank's residential and commercial real estate loans [Member] | Federal Reserve Bank of Atlanta [Member]
Line of Credit Facility [Line Items]
Unsecured debt, current	8,500,000	9,300,000
Unsecured federal funds lines of credit [Member]
Line of Credit Facility [Line Items]
Unsecured debt, current	$ 19,500,000	$ 19,500,000