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Securities - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 USD ($) security | Mar. 31, 2023 USD ($) security | Mar. 31, 2022 USD ($) security | Dec. 31, 2022 USD ($) security
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Number of securities | security | 793 |  | 793 |
Aggregate fair value of securities | $ 120,900,000 |  | $ 120,900,000 |
Loss from net unrealized holdings, net of tax | $ 814,000 | $ (14,608,000) | $ 64,286,000 |
Number of securities in unrealized loss positions | security |  | 2,647 |  | 2,828
Unrealized loss positions |  | $ 2,537,466,000 |  | $ 2,599,464,000
Percentage of portfolio |  | 95.70% |  | 97.00%
Allowance for credit losses for available for sale debt securities |  | $ 0 |  | $ 0
Accrued interest receivable on available for sale debt securities |  | $ 17,000,000 |  | $ 17,800,000

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