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Summary of Amount of Loss Recognized in Other Non-Interest Expense in Consolidated Statements of Income Related to Derivative Asset and Liability (Detail) (Derivatives not Designated as Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized	$ 106
Amount of Loss Recognized		(43)
Interest Rate Products [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized	106
Amount of Loss Recognized		$ (43)

The amount of gain 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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- Definition

The amount of loss 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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