Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Loans Restructured and Subsequently Defaulted Under the Restructured Terms) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) contracts	Dec. 31, 2015 USD ($) contracts	Dec. 31, 2014 USD ($) contracts
Financing Receivables, Modifications [Line Items]
Total Count | contracts	21	12	21
Total Balance | $	$ 12,897	$ 2,034	$ 11,967
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	8	6	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 7,841	$ 769	$ 2,127
Residential real estate and other
Financing Receivables, Modifications [Line Items]
Total Count | contracts	7	9	6
Total Balance | $	$ 1,082	$ 1,664	$ 1,836
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	0	4	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 568	$ 211
Commercial, industrial and other | Commercial
Financing Receivables, Modifications [Line Items]
Total Count | contracts	3	0	2
Total Balance | $	$ 345	$ 0	$ 1,549
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	1	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 28	$ 0	$ 88
Leases | Commercial
Financing Receivables, Modifications [Line Items]
Total Count | contracts	2	0	0
Total Balance | $	$ 2,949	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 0
Office | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total Count | contracts	1	0	2
Total Balance | $	$ 450	$ 0	$ 1,510
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	1	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 450	$ 0	$ 0
Industrial | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total Count | contracts	6	1	2
Total Balance | $	$ 7,921	$ 169	$ 1,763
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	5	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 7,347	$ 0	$ 1,078
Retail | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total Count | contracts	0	0	1
Total Balance | $	$ 0	$ 0	$ 202
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 0
Multi-family | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total Count | contracts	0	0	1
Total Balance | $	$ 0	$ 0	$ 181
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	0	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 181
Mixed use and other | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total Count | contracts	2	2	7
Total Balance | $	$ 150	$ 201	$ 4,926
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	1	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 16	$ 201	$ 569