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Loans - TDRs with a Payment Default During the Period (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
loan
Mar. 31, 2018
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Number of loans (in loan) | loan 0 2
Principal balance | $ $ 0 $ 85
Commercial loan portfolio    
Financing Receivable, Modifications [Line Items]    
Number of loans (in loan) | loan 0 1
Principal balance | $ $ 0 $ 82
Consumer loan portfolio    
Financing Receivable, Modifications [Line Items]    
Number of loans (in loan) | loan 0 1
Principal balance | $ $ 0 $ 3