Interest Rate Derivatives and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) (Cash Flow Hedging, Interest rate swaps, Designated as Hedging Instrument, Derivatives at Fair Value, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Derivatives at Fair Value
Derivatives, Fair Value [Line Items]
Derivative assets, at fair value	$ 7	$ 205
Derivative liabilities, at fair value	$ (2,175)	$ (1,276)