Derivative Assets And Collateral Received (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2013
Derivative Line Items
Gross amounts of recognized assets	$ 166,465,000		$ 181,866,000	$ 274,332,000
Derivative Assets not subject to master netting agreements	4,000,000			15,800,000
Subject to Master Netting Agreements
Derivative Line Items
Gross amounts of recognized assets	162,420,000	[1]		258,534,000	[1]
Gross amounts offset in the Statement of Condition	0			0
Net amounts of assets presented in the Statement of Condition	162,420,000	[1],[2]		258,534,000	[1],[2]
Derivative liabilities available for offset	(33,495,000)			(22,582,000)
Collateral Received	(128,810,000)			(234,562,000)
Net amount	115,000			1,390,000
Interest Rate Contract [Member] | Subject to Master Netting Agreements
Derivative Line Items
Gross amounts of recognized assets	162,420,000			258,534,000
Net amounts of assets presented in the Statement of Condition	$ 162,420,000			$ 258,534,000

[1] 2014 and 2013 are comprised entirely of interest rate derivative contracts.

[2] Included in Derivative Assets on the Consolidated Condensed Statements of Condition. As of March 31, 2014 and 2013, $4.0 million and $15.8 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.