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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Impaired Financing Receivables [Line Items]      
No Related Allowance, Unpaid Principal Balance $ 69,013 $ 60,590  
No Related Allowance, Recorded Investment 60,457 49,953  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 150,797 174,199  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 119,236 140,128  
Unpaid Principal Balance 219,810 234,789  
Recorded Investment 179,693 190,081  
Related Allowance 47,117 51,590  
No Related Allowance, Average Recorded Investment 55,940 59,005 $ 61,435
No Related Allowance, Interest Income Recognized 572 684 698
Related Allowance, Average Recorded Investment 125,972 134,747 135,416
Related Allowance, Interest Income, Accrual Method 1,754 1,897 2,079
Impaired Financing Receivable, Average Recorded Investment 181,912 193,752 196,851
Interest income on impaired loans 2,326 2,581 2,777
Leasing and other and overdrafts      
Impaired Financing Receivables [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 1,658  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 1,425  
Related Allowance 0 704  
Related Allowance, Average Recorded Investment 854 285 0
Related Allowance, Interest Income, Accrual Method 0 0 0
Consumer - direct      
Impaired Financing Receivables [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 21 19  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 21 19  
Related Allowance 14 14  
Related Allowance, Average Recorded Investment 18 17 16
Related Allowance, Interest Income, Accrual Method 1 1 1
Consumer - indirect:      
Impaired Financing Receivables [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 19 14  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 19 14  
Related Allowance 12 8  
Related Allowance, Average Recorded Investment 15 16 7
Related Allowance, Interest Income, Accrual Method 1 1 0
Construction - other      
Impaired Financing Receivables [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,096 331  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,096 193  
Related Allowance 423 68  
Related Allowance, Average Recorded Investment 682 263 387
Related Allowance, Interest Income, Accrual Method 0 0 0
Construction - commercial      
Impaired Financing Receivables [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 681 820  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 435 638  
Related Allowance 145 217  
No Related Allowance, Average Recorded Investment 0 915 1,907
No Related Allowance, Interest Income Recognized 0 0 0
Related Allowance, Average Recorded Investment 524 931 1,900
Related Allowance, Interest Income, Accrual Method 0 0 0
Construction - commercial residential      
Impaired Financing Receivables [Line Items]      
No Related Allowance, Unpaid Principal Balance 6,271 9,916  
No Related Allowance, Recorded Investment 4,795 8,865  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 10,103 9,949  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4,206 6,290  
Related Allowance 1,300 2,110  
No Related Allowance, Average Recorded Investment 6,285 11,685 15,421
No Related Allowance, Interest Income Recognized 48 148 227
Related Allowance, Average Recorded Investment 5,295 6,455 8,723
Related Allowance, Interest Income, Accrual Method 41 79 136
Real estate – residential mortgage      
Impaired Financing Receivables [Line Items]      
No Related Allowance, Unpaid Principal Balance 4,689 4,790  
No Related Allowance, Recorded Investment 4,689 4,790  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 48,885 55,242  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 41,359 45,635  
Related Allowance 11,897 13,422  
No Related Allowance, Average Recorded Investment 5,598 5,389 1,532
No Related Allowance, Interest Income Recognized 126 124 31
Related Allowance, Average Recorded Investment 42,191 46,252 50,281
Related Allowance, Interest Income, Accrual Method 908 1,041 1,178
Real estate – home equity      
Impaired Financing Receivables [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 23,971 20,347  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 19,205 15,766  
Related Allowance 9,511 7,993  
No Related Allowance, Average Recorded Investment 0 0 180
No Related Allowance, Interest Income Recognized 0 0 1
Related Allowance, Average Recorded Investment 17,912 13,887 13,976
Related Allowance, Interest Income, Accrual Method 285 144 108
Commercial - unsecured      
Impaired Financing Receivables [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,122 971  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 823 821  
Related Allowance 455 498  
No Related Allowance, Average Recorded Investment 0 17 0
No Related Allowance, Interest Income Recognized 0 0 0
Related Allowance, Average Recorded Investment 887 1,749 895
Related Allowance, Interest Income, Accrual Method 4 6 3
Commercial - secured      
Impaired Financing Receivables [Line Items]      
No Related Allowance, Unpaid Principal Balance 29,296 18,012  
No Related Allowance, Recorded Investment 25,526 13,702  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 27,767 39,659  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 22,626 33,629  
Related Allowance 13,198 14,085  
No Related Allowance, Average Recorded Investment 19,825 15,654 18,928
No Related Allowance, Interest Income Recognized 104 97 119
Related Allowance, Average Recorded Investment 25,857 25,660 20,991
Related Allowance, Interest Income, Accrual Method 130 150 129
Real estate – commercial mortgage      
Impaired Financing Receivables [Line Items]      
No Related Allowance, Unpaid Principal Balance 28,757 27,872  
No Related Allowance, Recorded Investment 25,447 22,596  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 37,132 45,189  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 29,446 35,698  
Related Allowance 10,162 12,471  
No Related Allowance, Average Recorded Investment 24,232 25,345 23,467
No Related Allowance, Interest Income Recognized 294 315 320
Related Allowance, Average Recorded Investment 31,737 39,232 38,240
Related Allowance, Interest Income, Accrual Method $ 384 $ 475 $ 524