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Securities - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
Investments, Debt and Equity Securities [Abstract] |  |
Number of securities in unrealized loss positions | security | 2,320 | 2,290
Unrealized loss positions | $ 2,100,000,000 | $ 2,100,000,000
Percentage of portfolio | 86.00% | 85.10%
Allowance for credit loss | $ 158,000 | $ 157,000
Accrued interest receivable on available for sale debt securities | 14,400,000 | 14,700,000
Allowance for credit losses for available for sale debt securities | $ 0 | $ 0

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