Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	$ 56,443
Unpaid principal balance, with related allowance	68,594
Unpaid Principal Balance	125,037	$ 125,098
Real estate - commercial mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	16,137
Unpaid principal balance, with related allowance	24,638
Unpaid Principal Balance	40,775	33,166
Commercial
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	21,157
Unpaid principal balance, with related allowance	18,222
Unpaid Principal Balance	39,379	48,106
Real estate - residential mortgage
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	1,256
Unpaid principal balance, with related allowance	15,634
Unpaid Principal Balance	16,890	16,676
Construction
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	1,070
Unpaid principal balance, with related allowance	2,412
Unpaid Principal Balance	3,482	3,618
Real-estate - home equity
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	0
Unpaid principal balance, with related allowance	7,688
Unpaid Principal Balance	7,688	7,004
Equipment lease financing, other and overdrafts
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	16,823
Unpaid principal balance, with related allowance	0
Unpaid Principal Balance	$ 16,823	$ 16,528