Derivative Liabilities and Collateral Pledged (Details) - USD ($)		Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Derivative [Line Items]
Gross amounts of recognized liabilities		$ 140,965,000	$ 119,239,000	$ 123,442,000
Derivative Liabilities not subject to master netting agreements		20,700,000		10,500,000
Derivatives, Interest Rate Contracts | Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized liabilities	[1]	120,234,000		112,901,000
Gross amounts offset in the Statement of Condition	[1]	0		0
Net amounts of liabilities presented in the Statement of Condition	[1],[2]	120,234,000		112,901,000
Derivative assets available for offset	[1]	(9,748,000)		(24,210,000)
Collateral pledged	[1]	(78,211,000)		(77,755,000)
Net amount	[1]	$ 32,275,000		$ 10,936,000

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

[2] In cluded in Derivative l iabilities on the Consolidated Condensed Statements of Condition. As of September 30 , 201 5 and 201 4 , $ 20 . 7 million and $ 10.5 million, respectively, of derivative liabilities (primarily fixed income forward contracts) have been excluded from these tables because they are generally not subject to master netting or similar agreements.