Annual report pursuant to Section 13 and 15(d)

Fair Values of Assets and Liabilities (Fair value option-changes in fair value) (Details 4)

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Fair Values of Assets and Liabilities (Fair value option-changes in fair value) (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mortgages Held For Sale
     
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ 13,842 $ (5,633) $ (6,312)
Automobile Loans
     
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (6,577) (2,267) 0
Fair Value, Option, Credit Risk, Gains (Losses) on Assets 6,610 3,370 0
Securitization Trust Notes Payable
     
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (7,731) $ (9,565) $ 0