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
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value $ 399,841 $ 544,581 $ 958,201 $ 58,607
Collateralized borrowings in securitization trust, at fair value 561,921 639,731    
Mortgage loans held-for-investment in securitization trusts 804,666 792,390    
Loan Held-for-Sale, Mortgages, Unpaid Principal [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value 398,302 680,840    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 11,723 80,486    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 10,803 63,152    
Loans Held-for-sale, Mortgages [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value 399,841 544,581    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 6,823 62,185    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 6,239 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 0 0    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 0 0    
Mortgage loans held-for-investment in securitization trusts 786,208 812,538    
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 0 0    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 0 0    
Mortgage loans held-for-investment in securitization trusts 804,666 792,390    
Collateralized Borrowings, Unpaid Principal [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Collateralized borrowings in securitization trust, at fair value 583,035 686,233    
Borrowings [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Collateralized borrowings in securitization trust, at fair value $ 561,921 $ 639,731