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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 13,591,174 | $ 12,854,359
Commercial and industrial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 4,604,895 | 4,114,292
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 275,817 | 256,312
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 789,021 | 792,144
Commercial real estate, non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,304,889 | 2,274,016
Commercial real estate, owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,232,117 | 1,157,944
Residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,412,783 | 2,374,729
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 687,021 | 659,811
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 138,703 | 166,028
Public finance and other commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 1,145,928 | $ 1,059,083

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