Goodwill and Other Intangible Assets (Narrative) (Details) (BankAtlantic [Member], USD $)	Jul. 31, 2012
BankAtlantic [Member]
Goodwill And Other Intangible Assets Life and Expense [Line Items]
Acquired loans	$ 1,700,000,000
Assumed deposits	3,500,000,000
Net purchase price received, excluding cash held by BankAtlantic which consists of the net liabilities assumed less a deposit premium	45,000,000
Deposit premium	$ 316,000,000