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Loans and Allowance for Credit Losses TDRs by Class Segment (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
loans
Sep. 30, 2016
USD ($)
loans
Sep. 30, 2017
USD ($)
loans
Sep. 30, 2016
USD ($)
loans
Financing Receivable, Modifications [Line Items]        
Post-Modification Recorded Investment $ 3,468 $ 3,823 $ 16,628 $ 10,303
Number of Loans | loans 27 42 97 115
Number of Loans | loans     39 45
Recorded Investment     $ 5,445 $ 6,045
Real estate - residential mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans     5 7
Recorded Investment     $ 1,321 $ 1,395
Real-estate - commercial mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans     3 2
Recorded Investment     $ 653 $ 129
Real-estate - home equity        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans     27 29
Recorded Investment     $ 1,598 $ 1,902
Commercial - secured        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans     2 6
Recorded Investment     $ 264 $ 2,593
Commercial - unsecured        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans     0 1
Recorded Investment     $ 0 $ 26
Construction - commercial residential        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 0    
Recorded Investment $ 1,198 $ 0    
Construction - other        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 0    
Recorded Investment $ 411 $ 0    
Extend maturity with rate concession | Real estate - residential mortgage        
Financing Receivable, Modifications [Line Items]        
Post-Modification Recorded Investment $ 468 $ 0 $ 468 $ 0
Number of Loans | loans 2 0 2 0