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Securities, at Fair Value - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2023
option
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]            
Securities, at fair value [1]   $ 1,140,036,000   $ 1,140,036,000   $ 746,090,000
Securities, at fair value            
Debt Securities, Available-for-sale [Line Items]            
Securities, at fair value   54,500,000   54,500,000   79,900,000
Amortized costs   50,000,000.0   50,000,000.0   74,200,000
Gross unrealized gains   4,500,000   $ 4,500,000   $ 5,700,000
Weighted average yield (in percent)       14.40%   17.00%
Weighted average to maturity       1 year 29 days   1 year 10 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   68,200,000   $ 68,200,000   $ 83,200,000
Securities, at fair value   51,800,000   51,800,000   51,200,000
Debt securities, sold   16,000,000        
Realized gain on securities sold   7,300,000        
Gross unrealized losses   0   0   0
Non-agency MBS            
Debt Securities, Available-for-sale [Line Items]            
Securities, at fair value   23,800,000   23,800,000   23,800,000
Gross unrealized losses   0   0   $ 100,000
Residential mortgage securities            
Debt Securities, Available-for-sale [Line Items]            
Debt securities, sold     $ 0 45,600,000 $ 0  
Realized gain on securities sold       10,000,000    
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.