Allowance for Loan Losses - Schedule of Information of Impaired Loans by Loan Portfolio Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Financial Receivables [Line Items]
Recorded Investment	$ 1,231	$ 1,447
Unpaid Principal Balance	1,231	1,447
Single Family [Member]
Schedule Of Financial Receivables [Line Items]
Recorded Investment	147	301
Unpaid Principal Balance	147	301
Commercial & Industrial [Member]
Schedule Of Financial Receivables [Line Items]
Recorded Investment	8	58
Unpaid Principal Balance	8	58
Non Owner Occupied [Member]
Schedule Of Financial Receivables [Line Items]
Recorded Investment	1,076	1,088
Unpaid Principal Balance	$ 1,076	$ 1,088