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Real Estate Securities - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Investment
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Investment
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Investment
Investment Holdings [Line Items]          
Trading securities pledged as collateral $ 668,000,000   $ 668,000,000    
Trading securities 1,108,243,000   1,108,243,000   $ 968,844,000
Trading securities acquired 189,000,000 $ 171,000,000 567,000,000 $ 432,000,000  
Trading securities sold 79,000,000 25,000,000 323,000,000 85,000,000  
Increase (decrease) in valuation of trading securities 6,000,000 1,000,000 2,000,000 31,000,000  
Available-for-sale securities purchased 1,000,000 4,000,000 7,000,000 32,000,000  
Available-for-sale securities sold 26,000,000 23,000,000 118,000,000 61,000,000  
Net realized gains on AFS securities $ 7,000,000 2,000,000 $ 21,000,000 9,000,000  
Number of AFS securities (in investments) | Investment 139   139   167
Number of securities in unrealized loss position (in investments) | Investment 11   11   9
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | Investment 3   3   3
Investment fair value changes, net $ 10,332,000 324,000 $ 12,830,000 9,990,000  
Other than temporary impairment recognized in AOCI 300,000   500,000 400,000  
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains on Available-for-Sale Securities          
Investment Holdings [Line Items]          
Other than temporary impairment 400,000   600,000    
Investment fair value changes, net (33,000) $ (3,000) (89,000) $ (248,000)  
Residential          
Investment Holdings [Line Items]          
Securities pledged as collateral 918,000,000   918,000,000   $ 788,000,000
Gross unrealized losses 1,235,000   1,235,000   1,367,000
Subordinate Securities | Residential          
Investment Holdings [Line Items]          
Gross unrealized losses 567,000   567,000   132,000
Sequoia securities | Subordinate Securities          
Investment Holdings [Line Items]          
Trading securities 68,000,000   68,000,000   68,000,000
Sequoia securities | Sequoia Choice          
Investment Holdings [Line Items]          
Trading securities pledged as collateral 129,000,000   129,000,000    
Interest-only Senior Trading Securities          
Investment Holdings [Line Items]          
Debt securities, trading 86,000,000   86,000,000   70,000,000
Unpaid principal balance 79,000,000   79,000,000   0
Interest-only Senior Trading Securities | Certificated Servicing Strips          
Investment Holdings [Line Items]          
Debt securities, trading 42,000,000   42,000,000   15,000,000
Trading securities | Residential Subordinate Securities          
Investment Holdings [Line Items]          
Unpaid principal balance 1,070,000,000   1,070,000,000   943,000,000
CRT securities | Mezzanine Securities          
Investment Holdings [Line Items]          
Trading securities 945,000,000   945,000,000   899,000,000
CRT securities | Subordinate Securities          
Investment Holdings [Line Items]          
Trading securities 236,000,000   236,000,000   301,000,000
Other third party securities | Subordinate Securities          
Investment Holdings [Line Items]          
Trading securities 225,000,000   225,000,000   206,000,000
Third-party multifamily mortgage-backed securities | Subordinate Securities          
Investment Holdings [Line Items]          
Trading securities 417,000,000   417,000,000   $ 324,000,000
Residential          
Investment Holdings [Line Items]          
Marketable securities, less than five years 100,000   100,000    
Marketable securities, due from five to ten years 2,000,000   2,000,000    
Residential | AFS securities retained, at fair value          
Investment Holdings [Line Items]          
Securities pledged as collateral $ 121,000,000   $ 121,000,000