Loans and Allowance for Credit Losses Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	$ 68,426	$ 55,150
Non-accrual TDRs	35,755	20,825
Total TDRs	104,181	75,975
Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	28,451	13,330
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	6,982	5,193
Commercial - secured
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	14,391	15,068
Real estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	18,602	21,551
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total accruing TDRs	$ 0	$ 8