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Investments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cumulative net unamortized unrealized gain | $ 5,451 | $ 5,451 |  | $ 1,603
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% | 10.00% |  | 10.00%
Securities pledged | $ 1,200,000 | $ 1,200,000 |  | $ 1,600,000
Mortgage-backed securities, weighted average life |  | 4 years |  |
Allowance for credit losses on available-for-sale securities | 0 | $ 0 |  | 0
Accrued interest receivable, held-to-maturity securities | 7,800 | 7,800 |  | 6,500
Allowance for credit losses on held-to-maturity securities | 253 | 253 |  | 785
Sale of debt securities, available-for-sale | 0 |  | $ 28,400 |
Debt Securities, Available-for-sale, Realized Gain |  |  | $ 400 |
Other investments, at cost | 75,754 | 75,754 |  | 66,195
Reclassified to Held to Maturity |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cumulative net unamortized unrealized gain | 11,700 | 11,700 |  | 14,100
Des Moines |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Other investments, at cost | $ 15,500 | $ 15,500 |  | $ 7,800

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