Derivative Financial Instruments Derivative Financial Instruments (Derivatives Used To Hedge Changes In Fair Value Attributable To Interest Rate Risk) (Detail) - Fair Value Hedging - Designated as Hedging Instrument - Interest Rate Contract - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ (323)	$ 16	$ (338)	$ (27)
Amount of Gain or (Loss) Recognized in Income on Hedged Item	302	(16)	315	24
Income Statement Gain/(Loss) due to Hedge Ineffectiveness	$ (21)	$ 0	$ (23)	$ (3)