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Securities - Narrative (Details) | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2024 USD ($) | Sep. 30, 2025 USD ($) investment | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) investment | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) investment | Dec. 31, 2009 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of short-term investments |  |  | $ 204,900,000 |  |  |  |  |
Proceeds from Sales | $ 375,300,000 | $ 500,000 |  | $ 175,738,000 | $ 205,876,000 | $ 402,105,000 |  |
Realized gain (loss) on sale of available-for-sale securities | $ (34,900,000) |  |  |  |  |  |  |
Tax equivalent yield (as a percent) | 3.12% |  |  |  |  |  |  |
Tax equivalent yield period (in years) | 7 years |  |  |  |  |  |  |
Carrying value of securities pledged to secure repurchase agreements, public and trust deposits and other by law |  | 998,737,000 |  |  | 998,737,000 |  | $ 1,065,880,000 |
Securities, available-for-sale, at fair value, allowance for credit losses |  | 0 |  |  | 0 |  | 0 |
Accrued interest receivable on available-for-sale debt securities |  | 8,015,000 |  |  | 8,015,000 |  | 8,110,000 |
Original amount in non-controlling investment security in a single banking organization |  | 353,000 |  |  | 353,000 |  | $ 353,000 | $ 1,350,000
Additional impairment on equity securities recognized through earnings |  | $ 0 |  |  | $ 0 |  |  | $ 997,000
Equity Securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Number of non-controlling investments in a single banking organization | investment |  | 1 |  |  | 1 |  | 1 |

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