Quarterly report pursuant to Section 13 or 15(d)

REAL ESTATE SECURITIES (Narrative) (Details)

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REAL ESTATE SECURITIES (Narrative) (Details)
1 Months Ended 9 Months Ended
Aug. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
security
Sep. 30, 2016
USD ($)
Investment [Line Items]        
Fair value of securities | security     0  
Proceeds from transaction     $ 595,850,000 $ 1,128,906,000
Real Estate Securities        
Investment [Line Items]        
Other-than-temporary impairment on securities and other investments     600,000  
Portion of other-than-temporary impairment on securities recognized in other comprehensive income (loss), net of the reversal of other comprehensive loss into net income (loss)     $ 0  
FNMA/FHLMC        
Investment [Line Items]        
Face amount of securities sold $ 299,500,000.0 $ 289,700,000.0    
Average price percentage - sold (as percent) 103.20% 98.80%    
Proceeds from transaction $ 309,000,000 $ 286,100,000    
Recognized loss on sale of securities (2,300,000) 2,800,000    
Repayments of repurchase agreements $ 302,100,000 $ 277,800,000