Quarterly report pursuant to Section 13 or 15(d)

Fair Value Fair Value, Option, Quantitative Disclosures - change in balance (Details)

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Fair Value Fair Value, Option, Quantitative Disclosures - change in balance (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value $ 559,737 $ 58,607
Mortgage loans held-for-investment in securitization trust, at fair value 804,988 0
Collateralized borrowings in securitization trust, at fair value 649,082 0
Loan Held-for-Sale, Mortgages, Unpaid Principal [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value 688,620 56,976
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 70,382 0
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 47,086 0
Loans Held-for-sale, Mortgages [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value 559,737 58,607
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 55,782 0
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 37,303 0
Loan Held-for-Investment, Mortgages, Unpaid Principal [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-investment in securitization trust, at fair value 825,285 0
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 0 0
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 0 0
Loans Held-for-investment, Mortgages [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-investment in securitization trust, at fair value 804,988 0
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 0 0
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 0 0
Collateralized Borrowings, Unpaid Principal [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateralized borrowings in securitization trust, at fair value 698,150 0
Borrowings [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateralized borrowings in securitization trust, at fair value $ 649,082 $ 0