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Derivative Instruments (Risk Participation Agreements) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Fair value of written RPAs	$ (44)	$ (32)
Maximum potential amount of future undiscounted payments	$ 5,798	$ 3,075
Percent of maximum potential amount of future undiscounted payments covered by proceeds from liquidation of pledged collateral	66.00%	55.00%
Minimum [Member]
Derivative [Line Items]
Range of remaining terms to maturity (in years)	1 year	1 year
Range of assigned internal risk ratings	2	3
Maximum [Member]
Derivative [Line Items]
Range of remaining terms to maturity (in years)	5 years	4 years
Range of assigned internal risk ratings	4	4

Represents the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative or each group of similar credit derivatives before reduction for potential recoveries under recourse or collateralization provisions in the credit derivative.

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