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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance $ 2,903 $ 2,843
Unpaid Principal Balance without a valuation allowance 2,900 2,862
Recorded Investment with a valuation allowance 1,085 982
Unpaid Principal Balance with a valuation allowance 1,082 996
Related Allowance, Total impaired loans 90 100
Recorded Investment, Total impaired loans 3,988 3,825
Unpaid Principal Balance, Total impaired loans 3,982 3,858
One-to-Four Family [Member] | Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance 2,422 2,364
Unpaid Principal Balance without a valuation allowance 2,421 2,377
Recorded Investment with a valuation allowance 984 874
Unpaid Principal Balance with a valuation allowance 981 878
Related Allowance, Total impaired loans 89 81
Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance 481 479
Unpaid Principal Balance without a valuation allowance 479 485
Recorded Investment with a valuation allowance 101 108
Unpaid Principal Balance with a valuation allowance 101 118
Related Allowance, Total impaired loans $ 1 $ 19