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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance $ 92,156 $ 89,986
Unpaid principal balance, with related allowance 137,567 139,277
Unpaid Principal Balance 229,723 229,263
Recorded investment, with no related allowance 78,453 77,566
Recorded investment, with related allowance 110,631 112,612
Recorded Investment 189,084 190,178
Related Allowance 39,185 40,332
Real-estate - commercial mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 27,178 25,095
Unpaid principal balance, with related allowance 26,014 29,005
Recorded investment, with no related allowance 24,902 23,481
Recorded investment, with related allowance 19,738 22,592
Related Allowance 6,210 7,255
Commercial    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 33,660 33,493
Unpaid principal balance, with related allowance 38,234 37,706
Recorded investment, with no related allowance 26,887 26,585
Recorded investment, with related allowance 28,974 28,708
Related Allowance 12,235 12,513
Real estate - residential mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 3,127 3,149
Unpaid principal balance, with related allowance 41,076 39,972
Recorded investment, with no related allowance 3,127 3,149
Recorded investment, with related allowance 36,451 35,621
Related Allowance 9,586 9,394
Construction    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 8,922 8,980
Unpaid principal balance, with related allowance 5,259 5,984
Recorded investment, with no related allowance 5,024 5,083
Recorded investment, with related allowance 1,627 2,307
Related Allowance 551 793
Real-estate - home equity    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 26,972 26,599
Recorded investment, with related allowance 23,830 23,373
Related Allowance 10,596 10,370
Equipment lease financing, other and overdrafts    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 19,269 19,269
Recorded investment, with no related allowance 18,513 19,268
Consumer    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 12 11
Recorded investment, with related allowance 11 11
Related Allowance $ 7 $ 7