Loans and Leases (Information on How Loans and Leases were Modified as a TDR) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	136	143	203
Post-Modification Recorded Investment | $	$ 88,771	$ 66,781	$ 37,636
Residential Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	7	1	16
Post-Modification Recorded Investment | $	$ 1,327	$ 20	$ 2,569
Residential Portfolio Segment [Member] | Adjusted Interest Rates [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	0	0	2
Post-Modification Recorded Investment | $	$ 0	$ 0	$ 335
Residential Portfolio Segment [Member] | Combination Rate and Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	15	9	12
Post-Modification Recorded Investment | $	$ 2,241	$ 947	$ 1,733
Residential Portfolio Segment [Member] | other concessions [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	8	21	39
Post-Modification Recorded Investment | $	$ 1,001	$ 3,573	$ 6,200
Consumer Portfolio Segment [Member] | Adjusted Interest Rates [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	0	0	1
Post-Modification Recorded Investment | $	$ 0	$ 0	$ 247
Commercial Portfolio Segment [Member] | Adjusted Interest Rates [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	2	0	0
Post-Modification Recorded Investment | $	$ 112	$ 0	$ 0
Finance Leases Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	0	4	0
Post-Modification Recorded Investment | $	$ 0	$ 736	$ 0
Home Equity Loan [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	6	4	12
Post-Modification Recorded Investment | $	$ 599	$ 469	$ 976
Home Equity Loan [Member] | Consumer Portfolio Segment [Member] | Combination Rate and Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	4	6	14
Post-Modification Recorded Investment | $	$ 140	$ 618	$ 3,469
Home Equity Loan [Member] | Consumer Portfolio Segment [Member] | other concessions [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	34	45	73
Post-Modification Recorded Investment | $	$ 1,907	$ 2,812	$ 4,907
Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	3	2	0
Post-Modification Recorded Investment | $	$ 8,356	$ 97	$ 0
Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member] | Combination Rate and Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	0	3	0
Post-Modification Recorded Investment | $	$ 0	$ 1,485	$ 0
Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member] | other concessions [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	3	1	0
Post-Modification Recorded Investment | $	$ 4,816	$ 5,111	$ 0
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	15	12	12
Post-Modification Recorded Investment | $	$ 2,413	$ 823	$ 1,233
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member] | Combination Rate and Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	11	15	18
Post-Modification Recorded Investment | $	$ 673	$ 8,842	$ 9,592
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member] | other concessions [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	28	20	4
Post-Modification Recorded Investment | $	$ 65,186	$ 41,248	$ 6,375