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Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Gross amounts of recognized liabilities $ 107,123 $ 133,713
Derivative liabilities not subject to master netting agreements 65,700 61,900
Derivatives, interest rate contracts    
Derivative [Line Items]    
Collateral pledged (28,679) (54,773)
Net amount 649 4,335
Subject to Master Netting Agreements | Derivatives, interest rate contracts    
Derivative [Line Items]    
Gross amounts of recognized liabilities 41,409 71,853
Derivative assets available for offset 0 0
Derivative liability 41,409 71,853
Derivative assets available for offset $ (12,081) $ (12,745)