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Loans - TDRs with a Payment Default During the Period (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Financing Receivable, Modifications [Line Items]        
Number of loans (in loan) | loan 5 2 10 4
Principal balance | $ $ 1,055 $ 788 $ 1,780 $ 1,721
Commercial loan portfolio        
Financing Receivable, Modifications [Line Items]        
Number of loans (in loan) | loan 2 1 5 2
Principal balance | $ $ 997 $ 788 $ 1,617 $ 1,721
Consumer loan portfolio        
Financing Receivable, Modifications [Line Items]        
Number of loans (in loan) | loan 3 1 5 2
Principal balance | $ $ 58 $ 0 $ 163 $ 0