Derivative Financial Instruments (Derivatives Used to Hedge Changes in Fair Value Attributable to Interest Rate Risk) (Details) - Fair value hedging - Designated as hedging instrument - Interest Rate Contract - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 2,344	$ (168)
Amount of Gain or (Loss) Recognized in Income on Hedged Item	(2,332)	152
Income Statement Gain/ (Loss) due to Hedge Ineffectiveness	$ 12	$ (16)