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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Impaired Financing Receivables [Line Items]    
Loans and Leases Receivable, Impaired, Commitment to Lend $ 52 $ 8,600
Unpaid principal balance, with no related allowance 93,425 88,716
Unpaid principal balance, with related allowance 139,073 141,739
Unpaid Principal Balance 232,498 230,455
Recorded investment, with no related allowance 80,733 75,111
Recorded investment, with related allowance 113,847 116,018
Recorded Investment 194,580 191,129
Related Allowance 40,275 41,521
Real-estate - commercial mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 29,862 26,728
Unpaid principal balance, with related allowance 32,863 33,710
Recorded investment, with no related allowance 27,819 22,886
Recorded investment, with related allowance 25,545 25,895
Related Allowance 8,325 8,112
Commercial    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 46,673 44,936
Unpaid principal balance, with related allowance 29,723 29,816
Recorded investment, with no related allowance 40,525 39,550
Recorded investment, with related allowance 24,185 24,175
Related Allowance 10,516 11,406
Real estate - residential mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 4,547 4,575
Unpaid principal balance, with related allowance 41,889 42,597
Recorded investment, with no related allowance 4,547 4,575
Recorded investment, with related allowance 36,390 37,132
Related Allowance 9,651 9,895
Construction    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 12,343 12,477
Unpaid principal balance, with related allowance 6,186 7,308
Recorded investment, with no related allowance 7,842 8,100
Recorded investment, with related allowance 2,891 4,097
Related Allowance 679 967
Real-estate - home equity    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 28,387 28,282
Recorded investment, with related allowance 24,812 24,693
Related Allowance 11,088 11,124
Consumer    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 25 26
Recorded investment, with related allowance 24 26
Related Allowance $ 16 $ 17