Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loans	Jun. 30, 2019 USD ($) loans	Jun. 30, 2020 USD ($) loans	Jun. 30, 2019 USD ($) loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	79	29	96	49
Post-Modification Recorded Investment | $	$ 27,685	$ 4,012	$ 29,388	$ 8,218
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	13	4	14	8
Post-Modification Recorded Investment | $	$ 1,304	$ 586	$ 1,378	$ 3,046
Real estate - commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	6	2	7	2
Post-Modification Recorded Investment | $	$ 16,082	$ 1,785	$ 16,474	$ 1,785
Real-estate - home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	19	22	27	34
Post-Modification Recorded Investment | $	$ 1,609	$ 1,125	$ 2,186	$ 1,954
Real estate - residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	33	1	40	5
Post-Modification Recorded Investment | $	$ 8,505	$ 516	$ 9,165	$ 1,433
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loans	8	0	8	0
Post-Modification Recorded Investment | $	$ 185	$ 0	$ 185	$ 0