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Credit Quality of Loans and the Allowance for Loan Losses (Schedule of Impaired Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Specific Allowance $ 741   $ 741   $ 658
Recorded Balance 2,983   2,983   3,141
Unpaid Principal Balance 2,997   2,997   3,209
Average Investment in Impaired Loans 3,039 $ 2,929 3,109 $ 3,167  
Interest Income Recognized 35 28 105 56  
One-to-four family residential [Member]          
Financing Receivable, Impaired [Line Items]          
Loans without a specific valuation allowance, Recorded Balance 1,122   1,122   1,121
Loans without a specific valuation allowance, Unpaid Principal Balance 1,136   1,136   1,189
Loans without a specific valuation allowance, Average Investment in Impaired Loans 1,130 1,024 1,146 1,044  
Loans without a specific valuation allowance, Interest Income Recognized 10 10 29 30  
Loans with a specific valuation allowance, Recorded Balance 208   208   406
Loans with a specific valuation allowance, Unpaid Principal Balance 208   208   406
Specific Allowance 143   143   323
Loans with a specific valuation allowance, Average Investment in Impaired Loans 273 652 333 911  
Loans with a specific valuation allowance, Interest Income Recognized  
Recorded Balance 1,330   1,330   1,527
Unpaid Principal Balance 1,344   1,344   1,595
Average Investment in Impaired Loans 1,403 1,676 1,479 1,955  
Interest Income Recognized 10 10 29 30  
All other mortgage loans [Member]          
Financing Receivable, Impaired [Line Items]          
Loans without a specific valuation allowance, Recorded Balance 213   213   226
Loans without a specific valuation allowance, Unpaid Principal Balance 213   213   226
Loans without a specific valuation allowance, Average Investment in Impaired Loans 216 1,045 220 782  
Loans without a specific valuation allowance, Interest Income Recognized 4 17 13 52  
Loans with a specific valuation allowance, Recorded Balance 910   910   841
Loans with a specific valuation allowance, Unpaid Principal Balance 910   910   841
Specific Allowance 159   159   151
Loans with a specific valuation allowance, Average Investment in Impaired Loans 875 159 857 390  
Loans with a specific valuation allowance, Interest Income Recognized 14 42  
Recorded Balance 1,123   1,123   1,067
Unpaid Principal Balance 1,123   1,123   1,067
Average Investment in Impaired Loans 1,091 1,204 1,077 1,173  
Interest Income Recognized 18 17 55 52  
Commercial business loans [Member]          
Financing Receivable, Impaired [Line Items]          
Loans without a specific valuation allowance, Recorded Balance    
Loans without a specific valuation allowance, Unpaid Principal Balance    
Loans without a specific valuation allowance, Average Investment in Impaired Loans  
Loans without a specific valuation allowance, Interest Income Recognized  
Loans with a specific valuation allowance, Recorded Balance 525   525   547
Loans with a specific valuation allowance, Unpaid Principal Balance 525   525   547
Specific Allowance 434   434   184
Loans with a specific valuation allowance, Average Investment in Impaired Loans 542 49 551 40  
Loans with a specific valuation allowance, Interest Income Recognized 7 1 21 1  
Recorded Balance 525   525   547
Unpaid Principal Balance 525   525   $ 547
Average Investment in Impaired Loans 542 49 551 40  
Interest Income Recognized 7 $ 1 21 $ 1  
Consumer loans [Member]          
Financing Receivable, Impaired [Line Items]          
Loans without a specific valuation allowance, Average Investment in Impaired Loans      
Loans without a specific valuation allowance, Interest Income Recognized      
Loans with a specific valuation allowance, Average Investment in Impaired Loans 3   2    
Loans with a specific valuation allowance, Interest Income Recognized      
Average Investment in Impaired Loans 3   2    
Interest Income Recognized      
Consumer loans [Member]          
Financing Receivable, Impaired [Line Items]          
Loans without a specific valuation allowance, Recorded Balance      
Loans without a specific valuation allowance, Unpaid Principal Balance      
Loans with a specific valuation allowance, Recorded Balance 5   5    
Loans with a specific valuation allowance, Unpaid Principal Balance 5   5    
Specific Allowance 5   5    
Recorded Balance 5   5    
Unpaid Principal Balance $ 5   $ 5