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Effect of Derivative Financial Instruments on Income Statement (Detail) (Not Designated as Hedging Instrument, Interest Rate Contract, Other Income, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Not Designated as Hedging Instrument \| Interest Rate Contract \| Other Income
Derivative [Line Items]
Amount of Gain (Loss) Recognized Income on Derivative	$ (70)	$ (95)	$ (125)	$ (93)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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