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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance $ 83,706 $ 69,013
Unpaid principal balance, with related allowance 141,467 150,797
Unpaid Principal Balance 225,173 219,810
Recorded investment, with no related allowance 71,695 60,457
Recorded investment, with related allowance 115,640 119,236
Recorded Investment 187,335 179,693
Related Allowance 43,078 47,117
Real-estate - commercial mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 25,219 28,757
Unpaid principal balance, with related allowance 34,131 37,132
Recorded investment, with no related allowance 22,396 25,447
Recorded investment, with related allowance 26,614 29,446
Related Allowance 8,317 10,162
Commercial - secured    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 43,206 29,296
Unpaid principal balance, with related allowance 23,576 27,767
Recorded investment, with no related allowance 36,036 25,526
Recorded investment, with related allowance 19,479 22,626
Related Allowance 9,947 13,198
Real estate - residential mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 4,629 4,689
Unpaid principal balance, with related allowance 45,300 48,885
Recorded investment, with no related allowance 4,629 4,689
Recorded investment, with related allowance 38,679 41,359
Related Allowance 10,426 11,897
Construction - commercial residential    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 10,054 6,271
Unpaid principal balance, with related allowance 10,479 10,103
Recorded investment, with no related allowance 8,044 4,795
Recorded investment, with related allowance 7,210 4,206
Related Allowance 3,725 1,300
Commercial - unsecured    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 912 1,122
Recorded investment, with related allowance 658 823
Related Allowance 354 455
Real-estate - home equity    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 25,753 23,971
Recorded investment, with related allowance 21,750 19,205
Related Allowance 9,849 9,511
Construction - commercial    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 598 0
Unpaid principal balance, with related allowance 186 681
Recorded investment, with no related allowance 590 0
Recorded investment, with related allowance 126 435
Related Allowance 45 145
Construction - other    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 1,096 1,096
Recorded investment, with related allowance 1,091 1,096
Related Allowance 394 423
Consumer - direct    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 18 21
Recorded investment, with related allowance 18 21
Related Allowance 12 14
Consumer - indirect    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 16 19
Recorded investment, with related allowance 15 19
Related Allowance $ 9 $ 12