Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Gross amounts of recognized liabilities		$ 101,347	$ 135,897
Derivative Liabilities not subject to master netting agreements		24,400	39,500
Derivatives, Interest Rate Contracts | Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized liabilities	[1]	76,986	96,363
Gross amounts offset in the Statement of Condition	[1]	0	0
Net amounts of liabilities presented in the Statement of Condition	[1],[2]	76,986	96,363
Derivative assets available for offset	[1]	(18,674)	(25,953)
Collateral pledged	[1]	(55,378)	(60,746)
Net amount	[1]	$ 2,934	$ 9,664

[1] Amounts are comprised entirely of interest rate derivative contracts.

[2] In cluded in Derivative l iabilities on the Consolidated Condensed Statements of Condition. As of March 31 , 2017 and December 31, 2016, $ 24 . 4 million and $ 39.5 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.