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Derivatives - Derivative Assets And Collateral Received (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Gross amounts of recognized assets | $ 118,128 | $ 81,475
Derivative assets not subject to master netting agreements | 37,100 | 28,900
Derivatives, interest rate contracts |  |
Derivative [Line Items] |  |
Collateral received | (68,887) | (39,637)
Net amount | 35 | 180
Derivatives, interest rate contracts | Subject to Master Netting Agreements |  |
Derivative [Line Items] |  |
Gross amounts of recognized assets | 81,003 | 52,562
Derivative liabilities available for offset | 0 | 0
Net amount | 81,003 | 52,562
Derivative liabilities available for offset | $ (12,081) | $ (12,745)

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