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Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Gross amounts of recognized liabilities $ 83,530 $ 133,713
Derivative liabilities not subject to master netting agreements 62,000 61,900
Derivatives, interest rate contracts    
Derivative [Line Items]    
Gross amounts of recognized liabilities 21,526 71,853
Derivative assets available for offset 0 0
Derivative liability 21,526 71,853
Derivative assets available for offset (2,957) (12,745)
Collateral pledged (18,269) (54,773)
Net amount $ 300 $ 4,335