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Securities - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
security
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
security
Investments, Debt and Equity Securities [Abstract]            
Number of securities | security 793          
Aggregate fair value of securities $ 120,900,000          
Loss from net unrealized holdings, net of tax $ 814,000 $ 25,515,000 $ 31,599,000 $ 15,675,000 $ 135,001,000  
Number of securities in unrealized loss positions | security   2,651   2,651   2,828
Unrealized loss positions   $ 2,411,718,000   $ 2,411,718,000   $ 2,599,464,000
Percentage of portfolio       99.60%   97.00%
Accrued interest receivable on available for sale debt securities   16,700,000   $ 16,700,000   $ 17,800,000
Allowance for credit losses for available for sale debt securities   0   0   0
Allowance for credit losses for held to maturity debt securities   $ 0   $ 0   $ 0