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Securities - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) security | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) security | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) security | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |
Debt securities, held-to-maturity, amortized cost, transfer, amount | $ 1,800,000 |  |  |  |  |  |  |  |
Debt securities, held-to-maturity, transfer, unrealized gain (loss) | 282,600 |  |  |  |  |  |  |  |
Debt securities, available-for-sale, sold at par value | 1,400,000 |  |  |  |  |  |  |  |
Gross losses | $ 299,500 | $ 299,132 | $ 0 | $ 299,538 | $ 0 |  |  |  |
Number of securities in unrealized loss positions | security |  | 801,000 |  | 801,000 |  | 2,115,000 |  |  |
Unrealized loss positions |  | $ 300,000 |  | $ 300,000 |  | $ 1,800,000 |  |  |
Percentage of portfolio |  |  |  | 36.00% |  | 86.00% |  |  |
Fair value of nonaccrual status |  | 2,900 |  | $ 2,900 |  |  |  |  |
Credit loss expense (benefit) |  | 0 | 0 | (150) | 0 |  |  |  |
Allowance for credit loss |  | 0 | $ (158) | 0 | $ (158) | $ (158) | $ (142) | $ (158) | $ (157)
Investment securities, held to maturity |  | 0 |  | 0 |  | 1,867,848 |  |  |
Accrued interest receivable on available for sale debt securities |  | 5,100 |  | 5,100 |  | 12,700 |  |  |
Tax benefit from the sale of securities available for sale |  | (62,900) |  | (62,900) |  |  |  |  |
State and municipal |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |
Investment securities, held to maturity |  | 0 |  | 0 |  | 1,048,862 |  |  |
State and municipal | Internally-Assigned Rating Methodology |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |
Investment securities, held to maturity |  | $ 0 |  | $ 0 |  | $ 125,000 |  |  |

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