Discount Rates Used in the Goodwill Impairment Test (Detail)	9 Months Ended
	Sep. 30, 2011
Branch Banking
Goodwill [Line Items]
Discount Rate Used In Goodwill Impairment Testing	15.90%
Commercial Banking
Goodwill [Line Items]
Discount Rate Used In Goodwill Impairment Testing	16.90%
Investment Advisors
Goodwill [Line Items]
Discount Rate Used In Goodwill Impairment Testing	18.70%