Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value, Option, Quantitative Disclosures - change in balance (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value $ 161,021 $ 544,581
Mortgage loans held-for-investment in securitization trust, at fair value 781,085 792,390
Collateralized borrowings in securitization trust, at fair value 658,953 639,731
Loan Held-for-Sale, Mortgages, Unpaid Principal [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value 173,293 680,840
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 16,753 80,486
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 1,033 63,152
Loans Held-for-sale, Mortgages [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held-for-sale, at fair value 161,021 544,581
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 12,038 62,185
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 826 48,786
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 799,258 812,538
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 781,085 792,390
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 703,259 686,233
Borrowings [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateralized borrowings in securitization trust, at fair value $ 658,953 $ 639,731