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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance $ 3,007 $ 2,843
Unpaid Principal Balance without a valuation allowance 3,025 2,862
Recorded Investment with a valuation allowance   982
Unpaid Principal Balance with a valuation allowance   996
Related Allowance, Total impaired loans 80 100
Recorded Investment, Total impaired loans 3,874 3,825
Unpaid Principal Balance, Total impaired loans 3,898 3,858
One-to-Four Family [Member] | Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance 2,529 2,364
Unpaid Principal Balance without a valuation allowance 2,541 2,377
Recorded Investment with a valuation allowance 867 874
Unpaid Principal Balance with a valuation allowance 873 878
Related Allowance, Total impaired loans 80 81
Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance 478 479
Unpaid Principal Balance without a valuation allowance $ 484 485
Recorded Investment with a valuation allowance   108
Unpaid Principal Balance with a valuation allowance   118
Related Allowance, Total impaired loans   $ 19