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Derivative Instruments and Hedging Activity - Interest Rate Derivatives (Details) - Interest Rate Swap [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Interest Rate Derivatives, Number of Instruments 10 11
Interest Rate Derivatives, Notional Amount $ 258,543 $ 184,304