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Derivatives and Hedging Activities - Offsetting Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts of Recognized Assets $ 6,854 $ 8,730
Gross Amounts of Recognized (Liabilities) (5,908) (3,886)
Gross Amounts Offset on the Balance Sheet, Assets 0 0
Net Amounts of Assets presented on the Balance Sheet 946 4,844
Financial Instruments, Assets 0 0
Cash Collateral Received (Posted), Assets 0 0
Net Amount, Assets $ 946 $ 4,844