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Derivative Instruments - Credit Risk and Credit-Risk-Related Contingent Feature (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Derivative asset | $ 48,186 | $ 4,464
Fair value of derivative assets | 48,186 | 4,464
Derivative liability | 13,848 | 12,968
Derivatives designated as hedging instruments: | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair value of derivative assets | $ 6,046 | $ 0

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