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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]          
Accrued interest $ 8,000,000   $ 8,000,000   $ 400,000
Unrealized losses and reversal of gains on investments 30,500,000 $ 17,400,000 $ 38,200,000 $ 20,500,000  
Contractual maturities (up to)     36 years    
Weighted average life of available for sale securities portfolio     7 years   7 years 7 months 6 days
Allowance for credit loss 0   $ 0   $ 0
Debt securities, allowance for credit loss, period increase (decrease) $ 0 0 $ 0 0  
ABS          
Debt Securities, Available-for-sale [Line Items]          
Unrealized losses and reversal of gains on investments   $ 15,900,000   $ 15,900,000