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Securities, at Fair Value - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2023
option
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Securities, at fair value [1]   $ 1,790,285,000   $ 1,537,513,000
Securities, at fair value        
Debt Securities, Available-for-sale [Line Items]        
Securities, at fair value   54,700,000   54,600,000
Amortized costs   51,600,000   50,600,000
Gross unrealized gains   $ 3,100,000   $ 3,900,000
Weighted average yield (in percent)   17.80%   14.00%
Weighted average to maturity   7 months 2 days   9 months 29 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   $ 64,500,000   $ 67,600,000
Securities, at fair value   51,100,000   51,500,000
Debt securities, sold   2,600,000    
Realized gain on securities sold   200,000    
Gross unrealized losses   0   0
Non-agency MBS        
Debt Securities, Available-for-sale [Line Items]        
Securities, at fair value   22,900,000   22,600,000
Gross unrealized losses   100,000   $ 500,000
Residential mortgage securities        
Debt Securities, Available-for-sale [Line Items]        
Debt securities, sold     $ 0  
AFS securities        
Debt Securities, Available-for-sale [Line Items]        
Gross unrealized losses   0    
Allowance for loan loss   $ 0 $ 0  
[1] See Note 6 for information regarding the Company’s pledged assets.