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Loans and Allowance for Credit Losses Average Impaired Loans by Class Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment $ 77,923 $ 59,135
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 183 134
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 114,934 119,939
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 533 445
Impaired Financing Receivable, Average Recorded Investment 192,857 179,074
Impaired Financing Receivable, Interest Income, Accrual Method 716 579
Real-estate - commercial mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 25,353 23,842
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 83 70
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 25,720 29,126
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 84 85
Commercial    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 40,038 25,574
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 73 36
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 24,181 23,044
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 44 32
Real-estate - home equity    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 24,752 19,079
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 184 95
Real estate - residential mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 4,561 4,673
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 27 26
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 36,761 40,839
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 221 230
Construction    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 7,971 5,046
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 0 2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 3,495 7,100
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 3
Consumer    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 25 38
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 0
Leasing, other and overdrafts    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 713
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0