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, 2015 USD ($) contracts	Dec. 31, 2014 USD ($) contracts	Dec. 31, 2013 USD ($) contracts
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	12	21	35
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 2,034	$ 11,967	$ 22,680
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	6	6	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 769	$ 2,127	$ 2,683
Residential real estate and other
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	9	6	10
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 1,664	$ 1,836	$ 2,296
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	4	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 568	$ 211	$ 0
Commercial and industrial | Commercial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	0	2	6
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 0	$ 1,549	$ 708
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	0	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 0	$ 88	$ 20
Commercial construction | Commercial real estate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	0	0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 0	$ 0	$ 6,120
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 0	$ 0	$ 0
Land | Commercial real estate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	0	0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 0	$ 0	$ 2,639
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	0	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 0	$ 0	$ 215
Office | Commercial real estate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	0	2	4
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 0	$ 1,510	$ 4,021
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	0	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 0	$ 0	$ 1,648
Industrial | Commercial real estate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	1	2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 169	$ 1,763	$ 949
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	0	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 0	$ 1,078	$ 0
Retail | Commercial real estate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	0	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 0	$ 202	$ 200
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 0	$ 0	$ 0
Multi-family | Commercial real estate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	0	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 0	$ 181	$ 705
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	0	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 0	$ 181	$ 705
Mixed use and other | Commercial real estate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1],[2],[3],[4]	2	7	6
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1],[2],[3],[4]	$ 201	$ 4,926	$ 5,042
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contracts	[2],[5]	2	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	[2],[5]	$ 201	$ 569	$ 95

[1] Balances represent the recorded investment in the loan at the time of the restructuring.

[2] Balances represent the recorded investment in the loan at the time of the restructuring.

[3] TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above.

[4] Total TDRs represent all loans restructured in TDRs during the year indicated.

[5] TDRs considered to be in payment default are over 30 days past-due subsequent to the restructuring.