Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENT - Additional Information (Detail)

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FAIR VALUE MEASUREMENT - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Fair Value Measurements [Line Items]        
Impairment charges $ 1,246,000,000 $ 1,431,000,000 $ 4,946,000,000 $ 4,567,000,000
Loss on sale and write-downs of OREO $ 933,000 $ 39,000 $ 1,416,000 $ 105,000