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Commitments And Contingencies (Changes To Anticipated Loan Losses) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Commitments and Contingencies Disclosure [Abstract]    
Liabilities, beginning of period $ 128,330 $ 93,057
Provision for losses 0 0
Settlements (4,810) (10,597)
Liabilities, end of period $ 123,520 $ 82,460