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Loans - Summary of loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Summary of Loans |  |  |  |  |  |
Total loans | $ 32,016,672 |  | $ 30,177,862 |  |  |
Less allowance for credit losses | (447,956) | $ (427,392) | (356,444) | $ (324,398) | $ (319,708) | $ (301,807)
Loans, net | 31,568,716 |  | 29,821,418 |  |  |
Deferred costs | 64,700 |  | 49,700 |  |  |
Unamortized Discounts | 55,200 |  | 72,100 |  |  |
Accrued interest receivable (AIR) | $ 123,100 |  | $ 105,400 |  |  |
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 | $ 2,776,241 |  | $ 2,860,360 |  |  |
Consumer Owner Occupied Loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 6,259,048 |  | 5,162,042 |  |  |
Home equity loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,349,097 |  | 1,313,168 |  |  |
Commercial and industrial |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 5,458,229 |  | 5,313,483 |  |  |
Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 670,331 |  | 696,242 |  |  |
Consumer loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,258,078 |  | 1,278,426 |  |  |
Other loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 4,199 |  | 20,989 |  |  |
Commercial loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 22,222,778 |  | 21,430,337 |  |  |
Commercial loans | Construction and land development |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,913,161 |  | 1,956,300 |  |  |
Commercial loans | Commercial non-owner occupied |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 8,702,352 |  | 8,072,959 |  |  |
Commercial loans | Commercial non-owner occupied real estate. |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 5,539,097 |  | 5,460,193 |  |  |
Commercial loans | Consumer Owner Occupied Loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 50,186 |  | 30,741 |  |  |
Commercial loans | Commercial owner occupied real estate loan |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 5,539,097 |  | 5,460,193 |  |  |
Commercial loans | Commercial and industrial |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 5,458,229 |  | 5,313,483 |  |  |
Commercial loans | Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 555,554 |  | 575,672 |  |  |
Commercial loans | Other loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 4,199 |  | 20,989 |  |  |
Consumer portfolio loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 9,793,894 |  | 8,747,525 |  |  |
Consumer portfolio loans | Construction and land development |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 863,080 |  | 904,060 |  |  |
Consumer portfolio loans | Consumer Owner Occupied Loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 6,208,862 |  | 5,131,301 |  |  |
Consumer portfolio loans | Home equity loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 1,349,097 |  | 1,313,168 |  |  |
Consumer portfolio loans | Other income producing property |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | 114,777 |  | 120,570 |  |  |
Consumer portfolio loans | Consumer loans |  |  |  |  |  |
Summary of Loans |  |  |  |  |  |
Total loans | $ 1,258,078 |  | $ 1,278,426 |  |  |

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