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Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Gross amounts of recognized liabilities | $ 133,713 | $ 85,061
Derivative liabilities not subject to master netting agreements | 61,900 | 15,200
Derivatives, interest rate contracts |  |
Derivative [Line Items] |  |
Collateral pledged | (54,773) | (51,801)
Net amount | 4,335 | 763
Subject to Master Netting Agreements | Derivatives, interest rate contracts |  |
Derivative [Line Items] |  |
Gross amounts of recognized liabilities | 71,853 | 69,842
Gross amounts offset in the Statements of Condition | 0 | 0
Net amounts of liabilities presented in the Statements of Condition (a) | 71,853 | 69,842
Gross amounts not offset in the Statements of Condition, Derivative assets available for offset | $ (12,745) | $ (17,278)

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