Derivative Assets And Collateral Received (Details) - USD ($)		Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Derivative [Line Items]
Gross amounts of recognized assets		$ 152,548,000	$ 134,088,000	$ 137,742,000
Derivative Assets not subject to master netting agreements		16,500,000		3,200,000
Derivatives, Interest Rate Contracts | Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized assets	[1]	136,098,000		134,534,000
Gross amounts offset in the Statement of Condition	[1]	0		0
Net amounts of assets presented in the Statement of Condition	[1],[2]	136,098,000		134,534,000
Derivative liabilities available for offset	[1]	(9,748,000)		(24,210,000)
Collateral Received	[1]	(121,401,000)		(110,262,000)
Net amount	[1]	$ 4,949,000		$ 62,000

[1] 201 5 and 2014 are comprised entirely of interest rate derivative contracts.

[2] In cluded in Derivative a ssets on the Consolidated Condensed Statements of Condition. As of September 30 , 201 5 and 201 4 , $ 16 . 5 million and $ 3.2 million, respectively, of derivative assets (primarily fixed income forward contracts) have been excluded from these tables because they are generally not subject to master netting or similar agreements.