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Loans - Troubled Debt Restructurings and COVID-19 (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
security
loan
Sep. 30, 2019
USD ($)
security
Sep. 30, 2020
USD ($)
security
loan
Sep. 30, 2019
USD ($)
security
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as TDRs $ 5,600,000   $ 5,600,000   $ 7,900,000
Number of loans modified as TDRs | security 1 4 4 4  
Total modifications $ 146,000 $ 5,100,000 $ 795,000 $ 5,100,000  
Number of TDR loans paid off | security 1 0 2 3  
TDR loans paid off $ 161,000   $ 2,900,000 $ 145,000  
Number of loans with post-modification changes for unpaid principal balance in loans modified as TDRs | security 0 0 0 0  
Number of loans for which there was payment default within first 12 months of modification | security     1 1  
Payment default within first 12 months of modification, recorded investment     $ 161,000 $ 97,000  
Commitments to extend additional credit to borrowers whose loan terms have been modified in TDRs $ 0   0   0
Loans held-for-portfolio 689,434,000   689,434,000   $ 619,887,000
CARES Act, PPP Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-portfolio 74,800,000   74,800,000    
CARES Act loan restructuring, postmodification $ 34,300,000   $ 34,300,000    
Commercial business loans | CARES Act, PPP Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans authorized | loan 49   49    
Loans held-for-portfolio $ 37,400,000   $ 37,400,000    
Commercial business loans | CARES Act, PPP Loan | Performing          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans authorized | loan 12   12    
Loans held-for-portfolio $ 14,700,000   $ 14,700,000    
Real estate loans: | One-to-four family | CARES Act, PPP Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans authorized | loan 72   72    
Loans held-for-portfolio $ 16,300,000   $ 16,300,000    
Real estate loans: | One-to-four family | CARES Act, PPP Loan | Performing          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans authorized | loan 25   25    
Loans held-for-portfolio $ 4,700,000   $ 4,700,000