Acquisition and Discontinued Operations (Details Textual) (USD $)	3 Months Ended				6 Months Ended											3 Months Ended		6 Months Ended
	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Jun. 30, 2012 HSBC Bank Branches [Member]	Jul. 13, 2012 HSBC Bank Branches [Member]	Jan. 11, 2012 HSBC Bank Branches [Member] Branch	Jun. 30, 2012 Retained Earnings [Member]	Dec. 31, 2011 Retained Earnings [Member]	Sep. 30, 2011 Retained Earnings [Member]	Jun. 30, 2011 Retained Earnings [Member]	Dec. 31, 2010 Retained Earnings [Member]	Jan. 01, 2010 Retained Earnings [Member]	Sep. 30, 2011 LIHTC funds [Member] Retained Earnings [Member]	Dec. 31, 2010 LIHTC funds [Member] Retained Earnings [Member]	Jun. 30, 2012 Segment, Discontinued Operations [Member]	Jun. 30, 2011 Segment, Discontinued Operations [Member]	Jun. 30, 2012 Segment, Discontinued Operations [Member]	Jun. 30, 2011 Segment, Discontinued Operations [Member]	Jan. 01, 2010 Segment, Discontinued Operations [Member] Trust	Jun. 30, 2012 Segment, Discontinued Operations [Member] Contractual Values [Member]	Jun. 30, 2012 Segment, Discontinued Operations [Member] Contractual Values [Member] Maximum [Member]	Jun. 30, 2012 Segment, Discontinued Operations [Member] Fair Value [Member]	Jun. 30, 2012 Segment, Discontinued Operations [Member] Fair Value [Member] Maximum [Member]
Divestiture and Discontinued Operations (Textual) [Abstract]
Economic interest or risk of loss associated with Education loan securitization trusts																$ 210,000,000		$ 210,000,000
Charges determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations, after tax																12,000,000	12,000,000	26,000,000	25,000,000
Loans held by the trust in nonaccrual status																					16,000,000		15,000,000
Loans held by portfolio in nonaccrual status																						1,000,000		1,000,000
Loans held by trusts with unpaid balances ninety days or more past due																					39,000,000		37,000,000
Loans held by portfolio with unpaid balances ninety days or more past due																					2,000,000		2,000,000
Number of outstanding securitization trusts																				10
Cumulative effect adjustment to beginning balance of Retained Earnings		10,176,000,000	9,922,000,000	9,737,000,000				6,595,000,000	6,246,000,000	45,000,000	5,926,000,000	5,557,000,000	45,000,000	45,000,000	45,000,000
Unearned Income		2,000,000	2,000,000	1,000,000
Overstate accrued income and other assets	30,000,000
Loans held by the trusts with unpaid principal balances due date																90 days or more		90 days or more
Loans held by the portfolio with unpaid principal balances due date																90 days or more		90 days or more
Divestiture and Discontinued Operations (Additional Textual) [Abstract]
Number of retail banking branches acquired in purchase and assumption agreement							37
Deposits assumed associated with branches acquired in purchase and assumption agreement						2,100,000,000
Loans purchased associated with branches acquired in purchase and assumption agreement						260,000,000
Percentage of premium paid on deposits					4.40%
Amount of premium paid on deposits					95,000,000
Business acquisition credit cards receivables assumed						$ 70,000,000