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Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, Beginning balance |  |  | $ 3,396,086 | $ 3,231,636 | $ 3,231,636
Goodwill, Ending balance | $ 3,504,388 | $ 3,504,388 | 3,504,388 | 3,504,388 | 3,396,086
Core Deposit Intangibles, Beginning balance |  |  | 63,994 | 51,348 | 51,348
Core Deposit Intangibles, Amortization | (4,146) | (3,576) | (11,539) | (9,117) | (12,676)
Core Deposit Intangibles, Ending balance | 70,178 | $ 70,178 | 70,178 | $ 70,178 | 63,994
First Bancshares Merger [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, Bancshares Merger |  |  | 316 |  | 164,450
Goodwill, Ending balance | 164,800 |  | 164,800 |  |
Core Deposit Intangibles, Bancshares Merger |  |  |  |  | $ 25,322
Lone Star State Bancshares Merger [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, Bancshares Merger |  |  | 107,986 |  |
Goodwill, Ending balance | 108,000 |  | 108,000 |  |
Core Deposit Intangibles, Bancshares Merger |  |  | 17,723 |  |
Core Deposit Intangibles, Ending balance | $ 17,700 |  | $ 17,700 |  |

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