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Contingencies and Guarantees (Schedule of Guarantor Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Guarantor Obligations [Line Items]      
Guarantor Obligations, Current Carrying Value $ 160,102 $ 173,847 $ 155,407
Standby Letters of Credit [Member]
     
Guarantor Obligations [Line Items]      
Guarantor Obligations, Current Carrying Value 132,216 135,039 113,689
Loans Sold with Recourse [Member]
     
Guarantor Obligations [Line Items]      
Guarantor Obligations, Current Carrying Value $ 27,886 $ 38,808 $ 41,718