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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Residential whole loans, carrying value $ 2,366,285,000 $ 2,704,646,000
Residential whole loans, fair value 889,100,000 827,001,000
Financial agreements held at fair value $ 2,974,578,000 $ 3,366,772,000
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 874,300 874,300
Common stock, shares issued (in shares) 446,114 451,714
Common stock, shares outstanding (in shares) 446,114 451,714
Collateral Pledged | Non-Agency MBS    
Securities, at fair value, pledged as collateral $ 350,115,000 $ 399,999,000
Series B Preferred Stock    
Preferred stock par value (usd per share) $ 0.01 $ 0.01
Preferred Stock, dividend rate 7.50% 7.50%
Preferred stock, shares authorized (in shares) 8,050 8,050
Preferred stock, shares issued (in shares) 8,000 8,000
Preferred stock, shares outstanding (in shares) 8,000 8,000
Preferred stock, liquidation preference, value $ 200,000,000 $ 200,000,000
Series C Preferred Stock    
Preferred stock par value (usd per share) $ 0.01 $ 0.01
Preferred Stock, dividend rate 6.50% 6.50%
Preferred stock, shares authorized (in shares) 12,650 12,650
Preferred stock, shares issued (in shares) 11,000 11,000
Preferred stock, shares outstanding (in shares) 11,000 11,000
Preferred stock, liquidation preference, value $ 275,000,000 $ 275,000,000