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Loans - Summary of loans (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024
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Summary of Loans |  |  |  |
Total loans | $ 49,496,783 | $ 48,598,527 |  |
Less allowance for credit losses | (585,882) | (585,197) | $ (623,690) | $ (465,280)
Loans, net | 48,910,901 | 48,013,330 |  |
Deferred costs | 97,400 | 97,000 |  |
Unamortized Discounts | 219,000 | 259,500 |  |
Accrued interest receivable (AIR) | $ 189,200 | $ 186,500 |  |
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 | $ 2,592,908 | $ 2,548,360 |  |
Consumer owner-occupied |  |  |  |
Summary of Loans |  |  |  |
Total loans | 8,717,832 | 8,618,434 |  |
Home equity loans |  |  |  |
Summary of Loans |  |  |  |
Total loans | 1,856,065 | 1,831,789 |  |
Commercial and industrial |  |  |  |
Summary of Loans |  |  |  |
Total loans | 9,385,926 | 9,181,408 |  |
Other income producing property |  |  |  |
Summary of Loans |  |  |  |
Total loans | 1,201,200 | 1,232,153 |  |
Consumer |  |  |  |
Summary of Loans |  |  |  |
Total loans | 923,413 | 955,266 |  |
Other loans |  |  |  |
Summary of Loans |  |  |  |
Total loans | 50,166 | 2,366 |  |
Commercial loans |  |  |  |
Summary of Loans |  |  |  |
Total loans | 37,649,135 | 36,858,811 |  |
Commercial loans | Construction and land development |  |  |  |
Summary of Loans |  |  |  |
Total loans | 2,232,480 | 2,205,518 |  |
Commercial loans | Commercial non-owner-occupied |  |  |  |
Summary of Loans |  |  |  |
Total loans | 17,097,738 | 16,651,760 |  |
Commercial loans | Consumer owner-occupied |  |  |  |
Summary of Loans |  |  |  |
Total loans | 117,442 | 121,394 |  |
Commercial loans | Commercial and industrial |  |  |  |
Summary of Loans |  |  |  |
Total loans | 9,385,926 | 9,181,408 |  |
Commercial loans | Other income producing property |  |  |  |
Summary of Loans |  |  |  |
Total loans | 1,093,848 | 1,119,374 |  |
Commercial loans | Other loans |  |  |  |
Summary of Loans |  |  |  |
Total loans | 50,166 | 2,366 |  |
Consumer loans |  |  |  |
Summary of Loans |  |  |  |
Total loans | 11,847,648 | 11,739,716 |  |
Consumer loans | Construction and land development |  |  |  |
Summary of Loans |  |  |  |
Total loans | 360,428 | 342,842 |  |
Consumer loans | Consumer owner-occupied |  |  |  |
Summary of Loans |  |  |  |
Total loans | 8,600,390 | 8,497,040 |  |
Consumer loans | Home equity loans |  |  |  |
Summary of Loans |  |  |  |
Total loans | 1,856,065 | 1,831,789 |  |
Consumer loans | Other income producing property |  |  |  |
Summary of Loans |  |  |  |
Total loans | 107,352 | 112,779 |  |
Consumer loans | Consumer |  |  |  |
Summary of Loans |  |  |  |
Total loans | $ 923,413 | $ 955,266 |  |

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