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Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
loans
Jun. 30, 2016
USD ($)
loans
Jun. 30, 2017
USD ($)
loans
Jun. 30, 2016
USD ($)
loans
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 39 30 70 73
Post-Modification Recorded Investment | $ $ 7,464 $ 2,803 $ 13,160 $ 6,480
Extend maturity without rate concession | Commercial - secured        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 4 4 8 6
Post-Modification Recorded Investment | $ $ 2,567 $ 1,146 $ 5,693 $ 1,976
Extend maturity without rate concession | Commercial - unsecured        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 0 1 2
Post-Modification Recorded Investment | $ $ 33 $ 0 $ 33 $ 103
Extend maturity without rate concession | Real-estate - commercial mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 3 0 4 0
Post-Modification Recorded Investment | $ $ 663 $ 0 $ 981 $ 0
Extend maturity without rate concession | Real-estate - home equity        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 17 18 33 39
Post-Modification Recorded Investment | $ $ 1,275 $ 738 $ 2,559 $ 1,995
Extend maturity without rate concession | Real estate - residential mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 0 2 2 2
Post-Modification Recorded Investment | $ $ 0 $ 315 $ 337 $ 315
Extend maturity without rate concession | Construction - commercial residential        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 0 1 0
Post-Modification Recorded Investment | $ $ 1,204 $ 0 $ 1,204 $ 0
Bankruptcy | Commercial - secured        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 0 1 0
Post-Modification Recorded Investment | $ $ 490 $ 0 $ 490 $ 0
Bankruptcy | Real-estate - commercial mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 0 1 0
Post-Modification Recorded Investment | $ $ 12 $ 0 $ 12 $ 0
Bankruptcy | Real-estate - home equity        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 10 5 17 22
Post-Modification Recorded Investment | $ $ 1,063 $ 231 $ 1,516 $ 1,716
Bankruptcy | Real estate - residential mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 1 2 1
Post-Modification Recorded Investment | $ $ 157 $ 373 $ 335 $ 373
Bankruptcy | Consumer - indirect        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 0 0 0 1
Post-Modification Recorded Investment | $ $ 0 $ 0 $ 0 $ 2