Derivative Liabilities and Collateral Pledged (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013	Sep. 30, 2013
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 123,442,000		$ 154,280,000	$ 165,918,000
Derivative Liabilities not subject to master netting agreements	10,500,000			12,500,000
Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized liabilities	112,901,000	[1]		153,403,000	[1]
Gross amounts offset in the Statement of Condition	0			0
Net amounts of liabilities presented in the Statement of Condition	112,901,000	[1],[2]		153,403,000	[1],[2]
Derivative assets available for offset	(24,210,000)			(36,770,000)
Collateral pledged	(77,755,000)			(109,079,000)
Net amount	10,936,000			7,554,000
Interest Rate Contract [Member] | Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized liabilities	112,901,000
Net amounts of liabilities presented in the Statement of Condition	$ 112,901,000

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

[2] Included in Derivative Liabilities on the Consolidated Condensed Statements of Condition. As of September 30, 2014 and 2013, $10.5 million and $12.5 million, respectively, of derivative liabilities (primarily capital markets forward contracts) have been excluded from these tables because they are generally not subject to master netting or similar agreements.