Federal Home Loan Bank Advances and Other Borrowings - Additional Information (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Advances outstanding	$ 0
Federal Reserve Bank of Atlanta [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	7,400,000	$ 5,800,000
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	86,165,000	56,438,000
Line of credit facility, maximum borrowing capacity	86,200,000	45,400,000
Bank's residential and commercial real estate loans [Member] | Federal Reserve Bank of Atlanta [Member]
Line of Credit Facility [Line Items]
Unsecured debt, current	10,700,000	8,400,000
Unsecured federal funds lines of credit [Member]
Line of Credit Facility [Line Items]
Unsecured debt, current	$ 28,500,000	28,500,000
FHLB advance [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 11,000,000