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
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value $ 192,417 $ 58,607 $ 5,711 $ 5,782
Mortgage loans held-for-investment in securitization trust, at fair value 434,068 0    
Collateralized borrowings in securitization trust, at fair value 397,229 0    
Loan Held-for-Sale, Mortgages, Unpaid Principal [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value 228,840 56,976    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 18,607 0    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 18,607 0    
Loans Held-for-sale, Mortgages [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held-for-sale, at fair value 192,417 58,607    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 12,590 0    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 12,590 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 421,485 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 434,068 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 407,361 0    
Borrowings [Member]
        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Collateralized borrowings in securitization trust, at fair value $ 397,229 $ 0