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Loans and Allowance for Loan Losses - Summary of Loan Portfolio (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 497,761 $ 489,305
Allowance for loan losses (6,563) (6,784)
Net deferred loan costs and fees, and purchase premiums 785 1,123
Loans, net 491,983 483,644
Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 465,168 458,757
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 146,930 143,893
Commercial Real Estate Loans [Member] | Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 146,930 143,893
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 23,869 20,259
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 8,724 10,289
One-to-Four Family [Member] | Residential Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 239,190 235,648
One-to-Four Family [Member] | Residential Real Estate [Member] | Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 239,190 235,648
Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member] | Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 49,073 48,166
Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 29,975 31,050
Construction [Member] | Real Estate Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 29,975 $ 31,050