Allowance for Loan Losses - Schedule of Additional Information of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Financial Receivables [Line Items]
Average Record Investment, with no related allowance recorded	$ 1,321	$ 1,465
Interest Income Recognized, with no related allowance recorded	76	123
Single Family [Member]
Schedule Of Financial Receivables [Line Items]
Average Record Investment, with no related allowance recorded	209	304
Interest Income Recognized, with no related allowance recorded	9	16
Non Owner Occupied [Member]
Schedule Of Financial Receivables [Line Items]
Average Record Investment, with no related allowance recorded	1,080	1,097
Interest Income Recognized, with no related allowance recorded	65	97
Commercial & Industrial [Member]
Schedule Of Financial Receivables [Line Items]
Average Record Investment, with no related allowance recorded	32	64
Interest Income Recognized, with no related allowance recorded	$ 2	$ 10