Derivative Assets And Collateral Received (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014	Mar. 31, 2014
Derivative [Line Items]
Gross amounts of recognized assets	$ 148,153,000		$ 134,088,000	$ 166,465,000
Derivative Assets not subject to master netting agreements	7,200,000			4,000,000
Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized assets	140,917,000	[1]		162,420,000	[1]
Gross amounts offset in the Statement of Condition	0	[1]		0	[2]
Net amounts of assets presented in the Statement of Condition	140,917,000	[1],[2]		162,420,000	[1],[2]
Derivative liabilities available for offset	(14,053,000)	[1]		(33,495,000)	[2]
Collateral Received	(126,820,000)	[1]		(128,810,000)	[2]
Net amount	44,000	[1]		115,000	[2]
Derivatives, Interest Rate Contracts | Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized assets	140,917,000			162,420,000
Net amounts of assets presented in the Statement of Condition	$ 140,917,000			$ 162,420,000

[1] 2015 and 2014are comprised entirely of interest rate derivative contracts.

[2] Included in Derivative Assets on the Consolidated Condensed Statements of Condition. As of March 31, 2015 and 2014, $7.2 million and $4.0 million, respectively, of derivative assets (primarily capital markets forward contracts) have been excluded from these tables because they are generally not subject to master netting or similar agreements.