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Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructuring (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
contract
Dec. 31, 2019
USD ($)
Dec. 31, 2019
loan
Dec. 31, 2018
contract
Dec. 31, 2018
USD ($)
Dec. 31, 2018
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of Contracts 2   7 1   1
Pre-Modification Outstanding Recorded Investments   $ 1,215     $ 374  
Post-Modification Outstanding Recorded Investments   1,251     392  
Residential Mortgage | One-to-four family            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of Contracts | contract 1          
Pre-Modification Outstanding Recorded Investments   421        
Post-Modification Outstanding Recorded Investments   460        
Commercial and multi-family real estate            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of Contracts | contract 1     1    
Pre-Modification Outstanding Recorded Investments   794     374  
Post-Modification Outstanding Recorded Investments   $ 791     $ 392