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Loans - Summary of loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Summary of Loans |  |  |  |  |  |
Total loans | $ 33,548,192 |  | $ 32,388,489 |  |  |
Less allowance for credit losses | (467,981) | $ (472,298) | (456,573) | $ (447,956) | $ (427,392) | $ (356,444)
Loans, net | 33,080,211 |  | 31,931,916 |  |  |
Deferred costs | 82,500 |  | 68,000 |  |  |
Unamortized Discounts | 39,800 |  | 51,300 |  |  |
Accrued interest receivable (AIR) | $ 137,700 |  | $ 127,000 |  |  |
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 | $ 2,458,151 |  | $ 2,923,514 |  |  |
Consumer Owner-Occupied Loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 7,133,748 |  | 6,595,005 |  |  |
Home equity loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,515,966 |  | 1,398,445 |  |  |
Commercial and industrial |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 5,931,187 |  | 5,504,539 |  |  |
Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 610,286 |  | 656,334 |  |  |
Consumer loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,106,382 |  | 1,233,650 |  |  |
Other loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,333 |  | 7,697 |  |  |
Commercial loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 23,323,367 |  | 22,391,162 |  |  |
Commercial loans | Construction and land development |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 2,028,387 |  | 2,207,965 |  |  |
Commercial loans | Commercial non-owner occupied |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 9,246,423 |  | 8,571,634 |  |  |
Commercial loans | Commercial non-owner occupied real estate |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 5,544,716 |  | 5,497,671 |  |  |
Commercial loans | Consumer Owner-Occupied Loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 65,205 |  | 57,443 |  |  |
Commercial loans | Commercial and industrial |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 5,931,187 |  | 5,504,539 |  |  |
Commercial loans | Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 506,116 |  | 544,213 |  |  |
Commercial loans | Other loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,333 |  | 7,697 |  |  |
Consumer loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 10,224,825 |  | 9,997,327 |  |  |
Consumer loans | Construction and land development |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 429,764 |  | 715,549 |  |  |
Consumer loans | Consumer Owner-Occupied Loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 7,068,543 |  | 6,537,562 |  |  |
Consumer loans | Home equity loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,515,966 |  | 1,398,445 |  |  |
Consumer loans | Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 104,170 |  | 112,121 |  |  |
Consumer loans | Consumer loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | $ 1,106,382 |  | $ 1,233,650 |  |  |

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