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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance $ 104,765 $ 88,716
Unpaid principal balance, with related allowance 128,499 141,739
Unpaid Principal Balance 233,264 230,455
Recorded investment, with no related allowance 68,863 75,111
Recorded investment, with related allowance 104,630 116,018
Recorded Investment 173,493 191,129
Related Allowance 37,469 41,521
Real-estate - commercial mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 27,298 26,728
Unpaid principal balance, with related allowance 28,584 33,710
Recorded investment, with no related allowance 25,665 22,886
Recorded investment, with related allowance 22,176 25,895
Related Allowance 7,299 8,112
Commercial    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 64,150 44,936
Unpaid principal balance, with related allowance 24,530 29,816
Recorded investment, with no related allowance 33,552 39,550
Recorded investment, with related allowance 19,318 24,175
Related Allowance 8,906 11,406
Real estate - residential mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 3,171 4,575
Unpaid principal balance, with related allowance 41,772 42,597
Recorded investment, with no related allowance 3,170 4,575
Recorded investment, with related allowance 36,660 37,132
Related Allowance 9,743 9,895
Construction    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 10,146 12,477
Unpaid principal balance, with related allowance 5,874 7,308
Recorded investment, with no related allowance 6,476 8,100
Recorded investment, with related allowance 2,214 4,097
Related Allowance 761 967
Real-estate - home equity    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 27,731 28,282
Recorded investment, with related allowance 24,254 24,693
Related Allowance 10,755 11,124
Consumer    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 8 26
Recorded investment, with related allowance 8 26
Related Allowance $ 5 $ 17