Derivatives and Hedging Activities - Schedule of Interest Rate Derivatives (Details) - Interest Rate Swaps [Member] $ in Thousands	Dec. 31, 2016 USD ($) derivative	Dec. 31, 2015 USD ($) derivative
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Number of Instruments | derivative	14	16
Notional Amount | $	$ 690,816	$ 1,211,651
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of Instruments | derivative	1	1
Notional Amount | $	$ 51,400	$ 51,400