Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of the Post-Modification Balance of Loans Restructured) (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
Extension At Below Market Terms
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	12	14	30
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 2,034	$ 8,025	$ 21,862
Reduction Of Interest Rate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	5	14	22
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 674	$ 8,391	$ 9,128
Modification To Interest Only Payments
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	4	5	8
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 420	$ 4,120	$ 7,471
Forgiveness Of Debt
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 1,073
Commercial | Commercial and industrial
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
Commercial | Extension At Below Market Terms | Commercial and industrial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	1	5
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 88	$ 573
Commercial | Reduction Of Interest Rate | Commercial and industrial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 1,461	$ 553
Commercial | Modification To Interest Only Payments | Commercial and industrial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	2	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 1,549	$ 185
Commercial | Forgiveness Of Debt | Commercial and industrial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Commercial construction
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
Commercial real estate | Land
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
Commercial real estate | Office
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
Commercial real estate | Industrial
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
Commercial real estate | Retail
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
Commercial real estate | Multi-family
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
Commercial real estate | Mixed use and other
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
Commercial real estate | Extension At Below Market Terms | Commercial construction
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 6,120
Commercial real estate | Extension At Below Market Terms | Land
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 2,639
Commercial real estate | Extension At Below Market Terms | Office
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	2	4
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 1,510	$ 4,021
Commercial real estate | Extension At Below Market Terms | Industrial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	1	2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 169	$ 1,763	$ 949
Commercial real estate | Extension At Below Market Terms | Retail
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 202	$ 200
Commercial real estate | Extension At Below Market Terms | Multi-family
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 705
Commercial real estate | Extension At Below Market Terms | Mixed use and other
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	2	3	6
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 201	$ 2,837	$ 5,042
Commercial real estate | Reduction Of Interest Rate | Commercial construction
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Reduction Of Interest Rate | Land
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 287
Commercial real estate | Reduction Of Interest Rate | Office
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 556
Commercial real estate | Reduction Of Interest Rate | Industrial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 685	$ 949
Commercial real estate | Reduction Of Interest Rate | Retail
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 200
Commercial real estate | Reduction Of Interest Rate | Multi-family
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 181	$ 705
Commercial real estate | Reduction Of Interest Rate | Mixed use and other
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	7	5
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 4,926	$ 4,947
Commercial real estate | Modification To Interest Only Payments | Commercial construction
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 6,120
Commercial real estate | Modification To Interest Only Payments | Land
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Modification To Interest Only Payments | Office
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Modification To Interest Only Payments | Industrial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	1	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 169	$ 1,078	$ 0
Commercial real estate | Modification To Interest Only Payments | Retail
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Modification To Interest Only Payments | Multi-family
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Modification To Interest Only Payments | Mixed use and other
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	2	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 201	$ 1,273	$ 932
Commercial real estate | Forgiveness Of Debt | Commercial construction
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Forgiveness Of Debt | Land
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 73
Commercial real estate | Forgiveness Of Debt | Office
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Forgiveness Of Debt | Industrial
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Forgiveness Of Debt | Retail
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Forgiveness Of Debt | Multi-family
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
Commercial real estate | Forgiveness Of Debt | Mixed use and other
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 0
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
Residential real estate and other | Extension At Below Market Terms
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	9	5	6
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 1,664	$ 1,625	$ 1,613
Residential real estate and other | Reduction Of Interest Rate
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	5	4	7
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 674	$ 1,138	$ 931
Residential real estate and other | Modification To Interest Only Payments
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	1	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 50	$ 220	$ 234
Residential real estate and other | Forgiveness Of Debt
Financing Receivables, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	[1]	0	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	[1]	$ 0	$ 0	$ 1,000

[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.