Quarterly report pursuant to Section 13 or 15(d)

Fair Value Fair Value, Option, Quantitative Disclosures - changes included in net income (Details)

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Fair Value Fair Value, Option, Quantitative Disclosures - changes included in net income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Total Included in Net Income $ 30,322 $ 24
Fair Value, Option, Credit Risk, Gains (Losses) on Assets 0 0
Interest Income on Mortgage Loans Held-for-Sale [Member] | Loans Receivable [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Interest Income (Expense) 1,318 69
Interest Income on Mortgage Loans Held-for-Investment [Member] | Fair Value Option, Other Eligible Items [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Interest Income (Expense) 1,654 0
Interest Expense on Collateralized Borrowings in Securitization Trust [Member] | Borrowings [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Interest Income (Expense) (818) 0
Gain (Loss) on Mortgage Loans [Member] | Loans Receivable [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Realized Gain (Loss) (62) 0
Fair Value, Option, Changes in Fair Value, Gain (Loss) 14,098 (45)
Gain (Loss) on Financing Securitizations [Member] | Fair Value Option, Other Eligible Items [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Changes in Fair Value, Gain (Loss) (8,002) 0
Gain (Loss) on Financing Securitizations [Member] | Borrowings [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Changes in Fair Value, Gain (Loss) 14,291 0
Gain (Loss) on Investments [Member] | Equity Securities [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ 7,843 $ 0