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Securities, at Fair Value - Composition of Agency MBS Portfolio (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Fair Value [1] $ 723,959 $ 333,364
5.00% Coupon    
Debt Securities, Available-for-sale [Line Items]    
Coupon rate (in percent) 5.00%  
Current Face $ 77,090  
Weighted Average Purchase Price (in percent) 100.20%  
Weighted Average Market Price (in percent) 94.50%  
Fair Value $ 72,830  
Weighted Average Loan Age (Months) 6 months  
CPR (in percent) 1.60%  
5.50% Coupon    
Debt Securities, Available-for-sale [Line Items]    
Coupon rate (in percent) 5.50%  
Current Face $ 282,748  
Weighted Average Purchase Price (in percent) 100.40%  
Weighted Average Market Price (in percent) 96.80%  
Fair Value $ 273,796  
Weighted Average Loan Age (Months) 8 months  
CPR (in percent) 8.60%  
6.00% Coupon    
Debt Securities, Available-for-sale [Line Items]    
Coupon rate (in percent) 6.00%  
Current Face $ 180,481  
Weighted Average Purchase Price (in percent) 100.00%  
Weighted Average Market Price (in percent) 98.80%  
Fair Value $ 178,386  
Weighted Average Loan Age (Months) 4 months  
CPR (in percent) 6.20%  
Agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Current Face $ 540,319 131,165
Weighted Average Purchase Price (in percent) 100.30%  
Weighted Average Market Price (in percent) 97.20%  
Fair Value $ 525,012 $ 131,700
Weighted Average Loan Age (Months) 6 months  
CPR (in percent) 6.80%  
[1] See Note 6 for information regarding the Company’s pledged assets.