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Loans Receivable - Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
contract
Mar. 31, 2019
USD ($)
contract
Dec. 31, 2019
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total TDR loans $ 3,523   $ 3,544
Allowance for loan losses related to TDR loans 44   41
Total nonaccrual TDR loans 81   81
Real Estate | Commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total TDR loans 642   643
Total nonaccrual TDR loans 0   0
One-to-four family | Real Estate | Real estate loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total TDR loans 2,354   2,371
Total nonaccrual TDR loans $ 81   $ 81
Number of contracts | contract 0 1  
Number of modifications   $ 48  
One-to-four family | Real Estate | Real estate loans | Rate Modification      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of modifications   0  
One-to-four family | Real Estate | Real estate loans | Term Modification      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of modifications   0  
One-to-four family | Real Estate | Real estate loans | Combination Modification      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of modifications   $ 48