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Derivatives (Derivative Liabilities and Collateral Pledged) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Gross amounts of recognized liabilities | $ 85,061 | $ 135,897
Derivative liabilities not subject to master netting agreements | 15,200 | 39,500
Subject to Master Netting Agreements | Derivatives, interest rate contracts |  |
Derivative [Line Items] |  |
Gross amounts of recognized liabilities | 69,842 | 96,363
Gross amounts offset in the Statements of Condition | 0 | 0
Net amounts of liabilities presented in the Statements of Condition (a) | 69,842 | 96,363
Gross amounts not offset in the Statements of Condition, Derivative assets available for offset | (17,278) | (25,953)
Gross amounts not offset in the Statements of Condition, Collateral pledged | (51,801) | (60,746)
Net amount | $ 763 | $ 9,664

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