Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees, Other Commitments (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Aug. 31, 2008
Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees [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
Other Commitment, Fiscal Year Maturity [Abstract]
Six months ending Dec., 31, 2013	26,876,000
2014	43,407,000
2015	11,870,000
2016	7,307,000
2017	2,865,000
Total	92,325,000
Total future equity contributions	92,325,000
Future equity contributions due within the next 12 months	47,200,000
Tax benefits in excess of capital contributions	91,400,000
Tax benefits not utilized	106,100,000
Equity contributions with an imputed interest rate [Abstract]
Equity contributions - imputed interst rate (in hundredths)	6.00%
Principal payment schedule above:	92,325,000
Less: unamortized discount	6,724,000
Total	$ 85,601,000
Period of Recognition of Gross Investment Amortization Expense	10 years
Remaining Period of Recognition of Gross Investment Amortization Expense	4 years