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Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Gross amounts of recognized liabilities | $ 83,146 | $ 135,897
Derivative Liabilities not subject to master netting agreements | 13,200 | 39,500
Subject to Master Netting Agreements | Derivatives, Interest Rate Contracts |  |
Derivative [Line Items] |  |
Gross amounts of recognized liabilities | 69,988 | 96,363
Gross amounts offset in the Statement of Condition | 0 | 0
Net amounts of liabilities presented in the Statement of Condition | 69,988 | 96,363
Derivative assets available for offset | (23,283) | (25,953)
Collateral pledged | (42,686) | (60,746)
Net amount | $ 4,019 | $ 9,664

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