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
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value $ 958,201 $ 58,607
Mortgage loans held-for-investment in securitization trust, at fair value 401,347 0
Collateralized borrowings in securitization trust, at fair value 363,012 0
Loan Held-for-Sale, Mortgages, Unpaid Principal [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value 1,101,388 56,976
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 49,468 0
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 30,408 0
Loans Held-for-sale, Mortgages [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value 958,201 58,607
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 28,889 0
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 18,090 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 405,519 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 401,347 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 391,458 0
Borrowings [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateralized borrowings in securitization trust, at fair value $ 363,012 $ 0