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Loans Receivable and Allowance for Loan Losses, Loans modified as TDRs (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
Contract
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Dec. 31, 2016
USD ($)
Contract
Loans modified [Abstract]          
Number of modifications | Contract     0 3  
Recorded investment prior to modification     $ 0 $ 624  
Recorded investment after modification     $ 0 $ 624  
TDRs loans accounted under method [Abstract]          
Number of modifications | Contract 52   52   58
Accrual status $ 15,416   $ 15,416   $ 18,066
Number of modifications | Contract 6   6   7
Nonaccrual status $ 2,375   $ 2,375   $ 2,392
Total number of modifications | Contract 58   58   65
Total balance of modifications $ 17,791   $ 17,791   $ 20,458
Number of contract, subsequent defaults | Contract 0 0 0 0  
Residential Mortgage [Member]          
Loans modified [Abstract]          
Number of modifications | Contract     0 3  
Recorded investment prior to modification     $ 0 $ 624  
Recorded investment after modification     $ 0 $ 624  
TDRs loans accounted under method [Abstract]          
Number of modifications | Contract 43   43   48
Accrual status $ 13,086   $ 13,086   $ 15,886
Number of modifications | Contract 4   4   4
Nonaccrual status $ 2,285   $ 2,285   $ 2,137
Total number of modifications | Contract 47   47   52
Total balance of modifications $ 15,371   $ 15,371   $ 18,023
Commercial Real Estate [Member]          
TDRs loans accounted under method [Abstract]          
Number of modifications | Contract 3   3   3
Accrual status $ 1,875   $ 1,875   $ 1,914
Number of modifications | Contract 1   1   2
Nonaccrual status $ 84   $ 84   $ 249
Total number of modifications | Contract 4   4   5
Total balance of modifications $ 1,959   $ 1,959   $ 2,163
ADC [Member]          
TDRs loans accounted under method [Abstract]          
Number of modifications | Contract 1   1   2
Accrual status $ 138   $ 138   $ 170
Number of modifications | Contract 1   1   1
Nonaccrual status $ 6   $ 6   $ 6
Total number of modifications | Contract 2   2   3
Total balance of modifications $ 144   $ 144   $ 176
Home Equity/2nds[Member]          
TDRs loans accounted under method [Abstract]          
Number of modifications | Contract 1   1    
Accrual status $ 230   $ 230    
Number of modifications | Contract 0   0    
Nonaccrual status $ 0   $ 0    
Total number of modifications | Contract 1   1    
Total balance of modifications $ 230   $ 230    
Consumer [Member]          
TDRs loans accounted under method [Abstract]          
Number of modifications | Contract 4   4   5
Accrual status $ 87   $ 87   $ 96
Number of modifications | Contract 0   0   0
Nonaccrual status $ 0   $ 0   $ 0
Total number of modifications | Contract 4   4   5
Total balance of modifications $ 87   $ 87   $ 96