Quarterly report pursuant to Section 13 or 15(d)

Fair Values of Assets and Liabilities (Fair value option) (Details 3)

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Fair Values of Assets and Liabilities (Fair value option) (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mortgages Held For Sale
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgages Held-for-sale, Fair Value Disclosure $ 415,126 $ 452,949
Mortgages Held For Sale, Unpaid Principal 405,095 438,254
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables 10,031 14,695
Automobile Loans
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Receivable, Fair Value Disclosure 116,039 142,762
Loans Receivable, Unpaid Principal 113,056 140,916
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables 2,983 1,846
Securitization Trust Notes Payable
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term Debt, Fair Value 0 0
Long-term Debt, Unpaid Principal 0 0
Fair Value, Option, Aggregate Differences, Long-term Debt Instruments $ 0 $ 0