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Real Estate Securities - Additional Information (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
Investment
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Investment
Investment Holdings [Line Items]      
Trading securities $ 591,152,000   $ 445,687,000
Trading securities acquired 154,000,000 $ 50,000,000  
Trading securities sold 9,000,000 218,000,000  
Increase (decrease) in valuation of trading securities 11,000,000 (4,000,000)  
Trading securities pledged as collateral 191,000,000    
Available-for-sale securities purchased 25,000,000 16,000,000  
Available-for-sale securities sold 19,000,000 126,000,000  
Net realized gains on AFS securities $ 5,000,000 9,000,000  
Number of AFS securities (in investments) | Investment 186   186
Number of securities in unrealized loss position (in investments) | Investment 22   19
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | Investment 10   10
Other-than-temporary impairments related to AFS securities $ 200,000    
Other than temporary impairment recognized in AOCI 100,000 $ 0  
Residential      
Investment Holdings [Line Items]      
Gross unrealized losses 2,680,000   $ 3,169,000
Subordinate Securities      
Investment Holdings [Line Items]      
Trading securities 552,262,000   408,620,000
Subordinate Securities | Residential      
Investment Holdings [Line Items]      
Gross unrealized losses $ 812,000   1,240,000
Re-REMIC      
Investment Holdings [Line Items]      
Number Of Re-REMICs exchanged during the period (in investments) | Investment 2    
Fair value of equity trading securities $ 12,000,000    
Re-REMIC | Residential      
Investment Holdings [Line Items]      
Gross unrealized losses 0   0
Trading securities | Residential Subordinate Securities      
Investment Holdings [Line Items]      
Unpaid principal balance 576,000,000   434,000,000
CRT securities | Subordinate Securities      
Investment Holdings [Line Items]      
Trading securities 198,000,000   152,000,000
Sequoia securities | Subordinate Securities      
Investment Holdings [Line Items]      
Trading securities 33,000,000   15,000,000
Other third party securities | Subordinate Securities      
Investment Holdings [Line Items]      
Trading securities 183,000,000   149,000,000
Commercial mortgage backed securities | Subordinate Securities      
Investment Holdings [Line Items]      
Trading securities 139,000,000   $ 92,000,000
Residential      
Investment Holdings [Line Items]      
Marketable securities, less than five years 100,000    
Marketable securities, due from five to ten years 500,000    
Residential | AFS securities retained, at fair value      
Investment Holdings [Line Items]      
Securities pledged as collateral $ 195,000,000