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Loans Receivable - Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
contract
Mar. 31, 2017
USD ($)
contract
Dec. 31, 2017
USD ($)
Financing Receivable, Modifications [Line Items]      
Total TDR loans $ 4,543   $ 4,919
Allowance for loan losses related to TDR loans 159   182
Total nonaccrual TDR loans $ 372   393
Number of contracts | contract 0    
Real Estate | Real estate loans      
Financing Receivable, Modifications [Line Items]      
Number of contracts | contract   1  
Total Modifications   $ 50  
Real Estate | Real estate loans | Rate Modification      
Financing Receivable, Modifications [Line Items]      
Total Modifications   0  
Real Estate | Real estate loans | Term Modification      
Financing Receivable, Modifications [Line Items]      
Total Modifications   0  
Real Estate | Real estate loans | Combination Modification      
Financing Receivable, Modifications [Line Items]      
Total Modifications   $ 50  
Real Estate | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Total TDR loans $ 792   910
Total nonaccrual TDR loans 107   217
One-to-four family | Real Estate | Real estate loans      
Financing Receivable, Modifications [Line Items]      
Total TDR loans 3,089   3,341
Total nonaccrual TDR loans $ 265   $ 176