Loans and Leases (Information on How Loans and Leases were Modified as a TDR) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		175	212	262
Post-Modification Recorded Investment | $	[1]	$ 43,669	$ 49,215	$ 47,031
Residential Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		17	27	27
Post-Modification Recorded Investment | $	[1]	$ 2,801	$ 4,909	$ 3,547
Residential Portfolio Segment [Member] | Adjusted Interest Rates [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		2	3	3
Post-Modification Recorded Investment | $	[1]	$ 528	$ 573	$ 448
Residential Portfolio Segment [Member] | Combination Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		13	26	22
Post-Modification Recorded Investment | $	[1]	$ 1,537	$ 5,315	$ 4,220
Residential Portfolio Segment [Member] | other concessions [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	[2]	24	30	55
Post-Modification Recorded Investment | $	[1],[2]	$ 4,090	$ 4,366	$ 11,791
Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		11	12	19
Post-Modification Recorded Investment | $	[1]	$ 484	$ 1,012	$ 944
Consumer Portfolio Segment [Member] | Adjusted Interest Rates [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		0	0	1
Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 51
Consumer Portfolio Segment [Member] | Combination Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		15	12	6
Post-Modification Recorded Investment | $	[1]	$ 1,156	$ 945	$ 411
Consumer Portfolio Segment [Member] | other concessions [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	[2]	52	68	90
Post-Modification Recorded Investment | $	[1],[2]	$ 3,131	$ 3,646	$ 4,931
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		12	3	7
Post-Modification Recorded Investment | $	[1]	$ 14,883	$ 254	$ 422
Commercial Portfolio Segment [Member] | Adjusted Interest Rates [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		0	1	1
Post-Modification Recorded Investment | $	[1]	$ 0	$ 24	$ 25
Commercial Portfolio Segment [Member] | Combination Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		2	7	22
Post-Modification Recorded Investment | $	[1]	$ 648	$ 5,361	$ 1,212
Commercial Portfolio Segment [Member] | other concessions [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	[2]	13	20	6
Post-Modification Recorded Investment | $	[1],[2]	$ 1,767	$ 22,048	$ 7,431
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		3	1	0
Post-Modification Recorded Investment | $	[1]	$ 4,921	$ 315	$ 0
Commercial Real Estate Portfolio Segment [Member] | Adjusted Interest Rates [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		1	0	0
Post-Modification Recorded Investment | $	[1]	$ 237	$ 0	$ 0
Commercial Real Estate Portfolio Segment [Member] | Combination Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		2	1	2
Post-Modification Recorded Investment | $	[1]	$ 335	$ 42	$ 11,106
Commercial Real Estate Portfolio Segment [Member] | other concessions [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	[2]	1	1	0
Post-Modification Recorded Investment | $	[1],[2]	$ 509	$ 405	$ 0
Finance Leases Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		7	0	1
Post-Modification Recorded Investment | $	[1]	$ 6,642	$ 0	$ 492

[1] Post-modification balances approximate pre-modification balances. The aggregate amount of charge-offs as a result of the restructurings was not significant.

[2] Other includes covenant modifications, forbearance, loans discharged under Chapter 7 bankruptcy, and/or other concessions.