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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance $ 8,469 $ 7,539
Unpaid Principal Balance without a valuation allowance 8,481 7,555
Recorded Investment with a valuation allowance 1,553 1,382
Unpaid Principal Balance with a valuation allowance 1,566 1,394
Related Allowance, Total impaired loans 149 133
Recorded Investment, Total impaired loans 10,022 8,921
Unpaid Principal Balance, Total impaired loans 10,047 8,949
Commercial Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance 5,768 4,753
Unpaid Principal Balance without a valuation allowance 5,762 4,751
Recorded Investment with a valuation allowance 17  
Unpaid Principal Balance with a valuation allowance 17  
Related Allowance, Total impaired loans 17  
One-to-Four Family [Member] | Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance 2,276 2,160
Unpaid Principal Balance without a valuation allowance 2,296 2,181
Recorded Investment with a valuation allowance 1,536 1,382
Unpaid Principal Balance with a valuation allowance 1,549 1,394
Related Allowance, Total impaired loans 132 133
Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment without a valuation allowance 425 626
Unpaid Principal Balance without a valuation allowance $ 423 $ 623