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Securities, at Fair Value - Composition of Agency MBS Portfolio (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Fair Value [1] $ 1,140,036 $ 746,090
$5.00% Coupon    
Debt Securities, Available-for-sale [Line Items]    
Coupon rate (in percent) 5.00% 5.00%
Current Face $ 72,522 $ 76,360
Weighted Average Purchase Price (in percent) 100.20% 100.20%
Weighted Average Market Price (in percent) 100.10% 99.10%
Fair Value $ 72,595 $ 75,650
Weighted Average Loan Age (Months) 18 months 9 months
CPR (in percent) 5.50% 2.40%
5.50% Coupon    
Debt Securities, Available-for-sale [Line Items]    
Coupon rate (in percent) 5.50% 5.50%
Current Face $ 548,652 $ 277,885
Weighted Average Purchase Price (in percent) 100.70% 100.40%
Weighted Average Market Price (in percent) 101.30% 100.70%
Fair Value $ 555,773 $ 279,851
Weighted Average Loan Age (Months) 11 months 11 months
CPR (in percent) 7.20% 5.20%
6.00% Coupon    
Debt Securities, Available-for-sale [Line Items]    
Coupon rate (in percent) 6.00% 6.00%
Current Face $ 325,792 $ 177,842
Weighted Average Purchase Price (in percent) 100.10% 100.00%
Weighted Average Market Price (in percent) 102.40% 101.70%
Fair Value $ 333,694 $ 180,841
Weighted Average Loan Age (Months) 11 months 7 months
CPR (in percent) 5.80% 4.20%
6.50% Coupon    
Debt Securities, Available-for-sale [Line Items]    
Coupon rate (in percent) 6.50% 6.50%
Current Face $ 30,319 $ 22,213
Weighted Average Purchase Price (in percent) 100.40% 100.10%
Weighted Average Market Price (in percent) 103.60% 102.70%
Fair Value $ 31,409 $ 22,802
Weighted Average Loan Age (Months) 12 months 4 months
CPR (in percent) 1.00% 1.40%
Agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Current Face $ 977,285 $ 554,300
Weighted Average Purchase Price (in percent) 100.50% 100.30%
Weighted Average Market Price (in percent) 101.70% 100.90%
Fair Value $ 993,471 $ 559,144
Weighted Average Loan Age (Months) 11 months 9 months
CPR (in percent) 6.40% 4.30%
[1] See Note 6 for information regarding the Company’s pledged assets.