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
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value $ 445,065 $ 544,581 $ 559,737 $ 58,607
Collateralized borrowings in securitization trust, at fair value 938,506 639,731    
Mortgage loans held-for-investment in securitization trusts 1,428,890 792,390    
Loan Held-for-Sale, Mortgages, Unpaid Principal [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value 445,692 680,840    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 19,913 80,486    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 18,944 63,152    
Loans Held-for-sale, Mortgages [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value 445,065 544,581    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 14,729 62,185    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 14,041 48,786    
Loan Held-for-Investment, Mortgages, Unpaid Principal [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 717 0    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 0 0    
Mortgage loans held-for-investment in securitization trusts 1,402,782 812,538    
Loans Held-for-investment, Mortgages [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 706 0    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 0 0    
Mortgage loans held-for-investment in securitization trusts 1,428,890 792,390    
Collateralized Borrowings, Unpaid Principal [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Collateralized borrowings in securitization trust, at fair value 959,670 686,233    
Borrowings [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Collateralized borrowings in securitization trust, at fair value $ 938,506 $ 639,731