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Investment Securities Available For Sale, at Fair Value - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Investment securities available for sale accrued interest $ 9,800,000 $ 400,000  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
Unrealized (losses) gains on investments $ 36,300,000 $ (22,600,000) $ 15,500,000
Net realized loss $ (12,600,000) $ 18,344,000 11,220,000
Contractual maturities 40 years    
Available for sale securities portfolio, weighted average life 6 years 10 months 24 days 7 years 7 months 6 days  
Non-Agency RMBS      
Debt Securities, Available-for-sale [Line Items]      
Net realized loss $ (11,172,000) $ 374,000 4,069,000
Non Agency RMBS Held In Securitization Trust | Non-Agency RMBS      
Debt Securities, Available-for-sale [Line Items]      
Net realized loss $ (1,700,000) $ 0 $ (5,500,000)