Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees, Other Commitments (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Aug. 31, 2008
New Markets Tax Credits [Abstract]
Membership interest in U.S Bank New Markets Tax Credit Fund (in hundredths)		99.90%
Equity contributions to be made to the Fund	$ 283,900,000
Net tax benefits to be received from the Fund	302,200,000
Difference between equity contributions and total benefits received will be recognized over the life of the Fund as net tax benefits	18,300,000
Future equity contributions [Abstract]
Nine months ending Dec. 31, 2013	38,956,000
Year ending Dec. 31, 2014	43,407,000
Year ending Dec. 31, 2015	11,870,000
Year ending Dec. 31, 2016	7,307,000
Year ending Dec. 31, 2017	2,865,000
Total future equity contributions	104,405,000
Equity contributions in next 12 months	49,100,000
Tax benefits in excess of capital contributions	98,700,000
Tax benefits not utilized	101,600,000
Equity contributions with an imputed interest rate [Abstract]
Equity contributions - imputed interst rate (in hundredths)	6.00%
Principal payment schedule above:	104,405,000
Less: unamortized discount	8,168,000
Total	$ 96,237,000
Period of Recognition of Gross Investment Amortization Expense	10
Remaining Period of Recognition of Gross Investment Amortization Expense	5