Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Gross amounts of recognized liabilities		$ 92,717	$ 135,897
Derivative Liabilities not subject to master netting agreements		18,300	39,500
Subject to Master Netting Agreements | Derivatives, Interest Rate Contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	[1]	74,389	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]	74,389	96,363
Derivative assets available for offset	[1]	(22,842)	(25,953)
Collateral pledged	[1]	(47,615)	(60,746)
Net amount	[1]	$ 3,932	$ 9,664

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

[2] Included in Derivative liabilities on the Consolidated Condensed Statements of Condition. As of June 30, 2017 and December 31, 2016, $18.3 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.