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Investment Securities Available For Sale, at Fair Value - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]          
Accrued interest $ 17,500,000   $ 17,500,000   $ 9,800,000
Unrealized gains (losses) on investment securities available for sale 58,300,000 $ (30,500,000) $ 10,400,000 $ (38,200,000)  
Realized loss on write-downs   (1,035,000)   (1,076,000)  
Contractual maturities (up to)     39 years    
Weighted average life of available for sale securities portfolio     5 years 4 months 24 days   6 years 10 months 24 days
Amortized Cost 0   $ 0   $ 35,000
Allowance for credit loss 0   0    
CECL credit losses 0 0 0 0  
Non-Agency RMBS          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 0   0   $ 35,000
Non Agency RMBS Held In Securitization Trust | Non-Agency RMBS          
Debt Securities, Available-for-sale [Line Items]          
Realized loss on write-downs $ (400,000) $ 0 $ (900,000) $ 0