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Investments - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment in equity securities, at fair value | $ 21,918,000 |  | $ 21,918,000 |  | $ 0
Amortization of unrealized gain on debt securities available-for-sale transferred to held-to-maturity | 770,000 | $ 987,000 | 2,335,000 | $ 4,159,000 |
Gain (loss) on securities held at fair value | 900,000 | 0 | 900,000 | 0 |
Securities retained, value |  | 57,900,000 |  | 16,100,000 |
Securities past due | 0 |  | 0 |  | $ 0
Beneficial interest, accretable yield | 2,400,000 | 1,900,000 | 3,800,000 | 6,000,000.0 |
Held-to-maturity securities, accretable yield | 300,000 | 500,000 | $ 1,100,000 | 1,700,000 |
Mortgage-backed securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unpaid principal balance | 110,000,000 |  |  |  |
Debt securities available-for-sale, at fair value |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unpaid principal balance | $ 62,700,000 |  |  |  |
Senior notes |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, realized loss |  | $ 400,000 |  | $ 3,300,000 |

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