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Loans - Summary of loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Summary of Loans |  |  |  |  |  |
Total loans | $ 47,667,911 |  | $ 33,902,927 |  |  |
Less allowance for credit losses | (590,133) | $ (621,046) | (465,280) | $ (467,981) | $ (472,298) | $ (456,573)
Loans, net | 47,077,778 |  | 33,437,647 |  |  |
Deferred costs | 95,000 |  | 86,700 |  |  |
Unamortized Discounts | 309,800 |  | 36,900 |  |  |
Accrued interest receivable (AIR) | $ 187,400 |  | $ 133,000 |  |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other Assets. |  | Other Assets. |  |  |
Construction and land development |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | $ 2,678,971 |  | $ 2,184,327 |  |  |
Consumer owner-occupied |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 8,441,314 |  | 7,144,885 |  |  |
Home equity loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,760,712 |  | 1,570,084 |  |  |
Commercial and industrial |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 8,644,636 |  | 6,222,876 |  |  |
Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,267,183 |  | 607,750 |  |  |
Consumer |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 987,085 |  | 1,062,599 |  |  |
Other loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 22,913 |  | 10,298 |  |  |
Commercial loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 36,137,245 |  | 23,705,601 |  |  |
Commercial loans | Construction and land development |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 2,328,743 |  | 1,798,096 |  |  |
Commercial loans | Commercial non-owner-occupied |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 16,336,022 |  | 9,383,732 |  |  |
Commercial loans | Commercial non-owner occupied real estate |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 7,529,075 |  | 5,716,376 |  |  |
Commercial loans | Consumer owner-occupied |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 124,457 |  | 66,910 |  |  |
Commercial loans | Commercial and industrial |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 8,644,636 |  | 6,222,876 |  |  |
Commercial loans | Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,151,399 |  | 507,313 |  |  |
Commercial loans | Other loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 22,913 |  | 10,298 |  |  |
Consumer loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 11,530,666 |  | 10,197,326 |  |  |
Consumer loans | Construction and land development |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 350,228 |  | 386,231 |  |  |
Consumer loans | Consumer owner-occupied |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 8,316,857 |  | 7,077,975 |  |  |
Consumer loans | Home equity loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,760,712 |  | 1,570,084 |  |  |
Consumer loans | Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 115,784 |  | 100,437 |  |  |
Consumer loans | Consumer |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | $ 987,085 |  | $ 1,062,599 |  |  |

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