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Derivatives (Liabilities and Collateral Pledged) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Gross amounts of recognized liabilities | $ 135,349 | $ 85,061
Gross amounts not offset in the Statements of Condition |  |
Derivative liabilities not subject to master netting agreements | 28,200 | 15,200
Derivatives, interest rate contracts |  |
Derivative [Line Items] |  |
Gross amounts of recognized liabilities | 107,178 | 69,842
Gross amounts offset in the Statements of Condition | 0 | 0
Net amounts of liabilities presented in the Statements of Condition | 107,178 | 69,842
Gross amounts not offset in the Statements of Condition |  |
Derivative assets available for offset | (13,490) | (17,278)
Collateral pledged | (65,689) | (51,801)
Net amount | $ 27,999 | $ 763

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