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Loans, Troubled Debt Restructurings Subsequent Default (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 32 26
Recorded Investment | $ $ 3,628 $ 1,212
Commercial and industrial    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 3 0
Recorded Investment | $ $ 0 $ 0
Residential mortgage    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 8 17
Recorded Investment | $ $ 2,219 $ 941
Home equity    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 21 9
Recorded Investment | $ $ 1,409 $ 271