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, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ (32)	$ (17)
Amount of Gain or (Loss) Recognized in Income on Hedged Item	28	15
Income Statement Gain/(Loss) due to Hedge Ineffectiveness	$ (4)	$ (2)