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Securities, at Fair Value (Residential Mortgage Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Fair  Value [1] $ 302,835 $ 399,999
Residential Mortgage Securities    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 103,757 161,878
Purchase Premiums 4,803 3,022
Accretable Purchase Discounts (63) (8,206)
Discount Designated as Credit Reserve and OTTI (20,768) (21,437)
Amortized Cost 87,729 135,257
Gross Unrealized Gains 18,572 26,926
Gross Unrealized Losses (16) (1,183)
Net Unrealized Gain/(Loss) 18,556 25,743
Fair  Value 106,285 161,000
RPL/NPL MBS    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face   55,000
Amortized Cost   46,900
Fair  Value   $ 53,900
Expected to Recover Less Than Par    
Debt Securities, Available-for-sale [Line Items]    
Percentage of current face amount of Non-Agency MBS to be recovered   99.00%
CRT, Fair Value Option    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 1,700 $ 551
Gross Unrealized Losses (16) (322)
Fair  Value $ 67,600 $ 66,200
[1] See Note 6 for information regarding the Company’s pledged assets.