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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments Designated as Hedging Instruments (Details) - Designated as Hedging Instrument - Interest rate swaps - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Interest rate swaps, derivative assets $ 108 $ 304
Interest rate swaps, derivative liabilities $ 6 $ 0