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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance $ 83,908 $ 88,716
Unpaid principal balance, with related allowance 158,573 141,739
Unpaid Principal Balance 242,481 230,455
Recorded investment, with no related allowance 63,602 75,111
Recorded investment, with related allowance 116,400 116,018
Recorded Investment 180,002 191,129
Related Allowance 38,930 41,521
Real-estate - commercial mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 27,582 26,728
Unpaid principal balance, with related allowance 32,432 33,710
Recorded investment, with no related allowance 26,435 22,886
Recorded investment, with related allowance 25,293 25,895
Related Allowance 8,094 8,112
Commercial    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 41,971 44,936
Unpaid principal balance, with related allowance 50,734 29,816
Recorded investment, with no related allowance 26,761 39,550
Recorded investment, with related allowance 28,055 24,175
Related Allowance 9,691 11,406
Real estate - residential mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 3,193 4,575
Unpaid principal balance, with related allowance 41,025 42,597
Recorded investment, with no related allowance 3,193 4,575
Recorded investment, with related allowance 36,131 37,132
Related Allowance 9,333 9,895
Construction    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 11,162 12,477
Unpaid principal balance, with related allowance 5,595 7,308
Recorded investment, with no related allowance 7,213 8,100
Recorded investment, with related allowance 1,908 4,097
Related Allowance 650 967
Real-estate - home equity    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 28,776 28,282
Recorded investment, with related allowance 25,002 24,693
Related Allowance 11,154 11,124
Consumer    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 11 26
Recorded investment, with related allowance 11 26
Related Allowance $ 8 $ 17