Activity in the FDIC Loss Share Indemnification Asset (Parenthetical) (Detail) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Claims receivables filed with the FDIC	$ 545,416	[1]

[1] Represent claims filed with the FDIC for losses on covered assets and reimbursable expenses. The Corporation received payment from the FDIC amounting to $545 million in July 2011.