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Securities, at Fair Value - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Mar. 31, 2024
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
option
Oct. 31, 2023
Debt Securities, Available-for-sale [Line Items]              
Securities, at fair value [1] $ 863,289,000     $ 863,289,000   $ 746,090,000  
Securities, at fair value              
Debt Securities, Available-for-sale [Line Items]              
Securities, at fair value 54,300,000     54,300,000   79,900,000  
Amortized costs 49,500,000     49,500,000   74,200,000  
Gross unrealized gains 4,800,000     $ 4,800,000   $ 5,700,000  
Weighted average yield (in percent)       14.50%   17.00%  
Weighted average to maturity   1 year 10 months 2 days   1 year 4 months 2 days      
Optional extension period       2 years      
Term Notes Backed By MSR Related Collateral              
Debt Securities, Available-for-sale [Line Items]              
Number of options to extend maturity | option           1  
Step up in coupon rate (in percent)             0.75%
CRT securities              
Debt Securities, Available-for-sale [Line Items]              
CRT securities 84,600,000     $ 84,600,000   $ 83,200,000  
Non-Agency MBS              
Debt Securities, Available-for-sale [Line Items]              
Securities, at fair value 23,100,000     23,100,000   23,800,000  
Gross unrealized losses 400,000     400,000   100,000  
MSR-Related Assets              
Debt Securities, Available-for-sale [Line Items]              
Debt securities, sold 29,600,000   $ 0 29,600,000 $ 0    
Realized gain on securities sold 2,700,000     2,700,000      
CRT, Fair Value Option              
Debt Securities, Available-for-sale [Line Items]              
Securities, at fair value 52,000,000.0     52,000,000.0   51,200,000  
Gross unrealized losses 0     0   $ 0  
AFS securities              
Debt Securities, Available-for-sale [Line Items]              
Gross unrealized losses 0     0      
Allowance for loan loss $ 0   $ 0 $ 0 $ 0    
[1] See Note 6 for information regarding the Company’s pledged assets.