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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

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