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Loans - Summary of allowance for loan losses allocated by loan class and activity in allowance for loan losses for years (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance $ 811 $ 653
Charge Offs (1)
Recoveries
Provisions 180 158
Ending Balance 990 [1] 811
Real estate loans: | Secured by one-to-four family residences    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 524 448
Charge Offs
Recoveries
Provisions 60 76
Ending Balance 584 524
Real estate loans: | Secured by multi-family residences    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 39 29
Charge Offs
Recoveries
Provisions (1) 10
Ending Balance 38 39
Real estate loans: | Construction    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 6 6
Charge Offs
Recoveries
Provisions 25
Ending Balance 31 6
Real estate loans: | Commercial    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 35 14
Charge Offs
Recoveries
Provisions 49 21
Ending Balance 84 35
Real estate loans: | Home equity lines of credit    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 101 87
Charge Offs
Recoveries
Provisions 11 14
Ending Balance 112 101
Other Loans Portfolio Segment | Commercial and industrial    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 11 1
Charge Offs
Recoveries
Provisions 17 10
Ending Balance 28 11
Other Unallocated    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 95 68
Charge Offs (1)
Recoveries
Provisions 19 27
Ending Balance $ 113 [1] $ 95
[1] All Loans are collectively evaluated for impairment.