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Securities, at Fair Value - Interest Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]        
Interest income $ 9,948 $ 5,294 $ 17,256 $ 10,569
Agency MBS        
Debt Securities, Available-for-sale [Line Items]        
Coupon interest 4,471 0 6,522 0
Effective yield adjustment (45) [1],[2] 0 [1],[2] (76) 0
Interest income 4,426 0 6,446 0
Other MBS        
Debt Securities, Available-for-sale [Line Items]        
Coupon interest 2,025 1,055 3,936 1,950
Effective yield adjustment 28 [1],[2] 1,006 [1],[2] 217 2,272
Interest income 2,053 2,061 4,153 4,222
Term notes backed by MSR collateral        
Debt Securities, Available-for-sale [Line Items]        
Coupon interest 2,100 1,419 4,063 2,576
Effective yield adjustment 1,369 [2] 1,814 [2] 2,594 3,771
Interest income $ 3,469 $ 3,233 $ 6,657 $ 6,347
[1] Includes amortization of premium paid net of accretion of purchase discount.  Interest income is recorded at an effective yield, which reflects net premium amortization/accretion based on actual prepayment activity.
[2] The effective yield adjustment is the difference between the net income calculated using the net yield less the current coupon yield. The net yield may be based on management’s estimates of the amount and timing of future cash flows or in the instrument’s contractual cash flows, depending on the relevant accounting standards.