Derivative Assets And Collateral Received (Details) - USD ($)		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Derivative [Line Items]
Gross amounts of recognized assets		$ 165,007,000	$ 104,365,000	$ 148,153,000
Derivative Assets not subject to master netting agreements		14,000,000		7,200,000
Derivatives, Interest Rate Contracts | Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized assets	[1]	150,973,000		140,917,000
Gross amounts offset in the Statement of Condition	[1]	0		0
Net amounts of assets presented in the Statement of Condition	[1],[2]	150,973,000		140,917,000
Derivative liabilities available for offset	[1]	(9,998,000)		(14,053,000)
Collateral Received	[1]	(125,274,000)		(126,820,000)
Net amount	[1]	$ 15,701,000		$ 44,000

[1] 201 6 and 2015 are comprised entirely of interest rate derivative contracts.

[2] In cluded in Derivative a ssets on the Consolidated Condensed Statements of Condition. As of March 31 , 201 6 and 201 5 , $ 14 . 0 million and $ 7.2 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.