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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ (333)	$ (329)	$ (181)	$ (883)
Amount of Gain or (Loss) Recognized in Income on Hedged Item	373	346	210	861
Income Statement Gain/(Loss) due to Hedge Ineffectiveness	$ 40	$ 17	$ 29	$ (22)