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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance $ 90,879 $ 89,986
Unpaid principal balance, with related allowance 147,480 139,277
Unpaid Principal Balance 238,359 229,263
Recorded investment, with no related allowance 78,924 77,566
Recorded investment, with related allowance 115,406 112,612
Recorded Investment 194,330 190,178
Related Allowance 41,881 40,332
Real-estate - commercial mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 32,406 25,095
Unpaid principal balance, with related allowance 40,435 29,005
Recorded investment, with no related allowance 30,574 23,481
Recorded investment, with related allowance 29,319 22,592
Related Allowance 9,492 7,255
Commercial    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 29,696 33,493
Unpaid principal balance, with related allowance 38,010 37,706
Recorded investment, with no related allowance 23,588 26,585
Recorded investment, with related allowance 27,994 28,708
Related Allowance 12,356 12,513
Real estate - residential mortgage    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 4,565 3,149
Unpaid principal balance, with related allowance 37,202 39,972
Recorded investment, with no related allowance 4,400 3,149
Recorded investment, with related allowance 32,939 35,621
Related Allowance 8,979 9,394
Construction    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 6,454 8,980
Unpaid principal balance, with related allowance 5,112 5,984
Recorded investment, with no related allowance 2,604 5,083
Recorded investment, with related allowance 1,563 2,307
Related Allowance 529 793
Real-estate - home equity    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 26,712 26,599
Recorded investment, with related allowance 23,582 23,373
Related Allowance 10,518 10,370
Equipment lease financing, other and overdrafts    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 17,758 19,269
Recorded investment, with no related allowance 17,758 19,268
Consumer    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 9 11
Recorded investment, with related allowance 9 11
Related Allowance $ 7 $ 7