Loans and Allowance for Credit Losses Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	$ 55,150	$ 61,605
Non-accrual TDRs	20,825	28,659
Total TDRs	75,975	90,264
Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	21,551	24,102
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	13,330	15,685
Commercial - secured
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	5,193	5,143
Real estate – home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	15,068	16,665
Consumer - direct
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	$ 8	$ 10