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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, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 15,600,974 $ 13,791,707
Commercial and industrial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 4,578,572 4,478,282
Agricultural land, production and other loans to farmers    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 339,723 283,125
Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 959,483 804,775
Commercial real estate, non-owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 3,208,902 2,338,666
Commercial real estate, owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 1,440,264 1,237,100
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 2,419,376 2,420,310
Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 1,139,040 710,980
Individuals' loans for household and other personal expenditures    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 157,939 155,436
Public finance and other commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 1,357,675 $ 1,363,033