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Activity of OTTI on Investment Securities Due to Credit Losses Recognized in Earnings (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Cumulative credit losses on investment securities, through January 1, 2012   $ 422
Additions for credit losses not previously recognized 8 72
Cumulative credit losses on investment securities, through June 30, 2012 $ 72 $ 72