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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Composition of Loan Portfolio by Loan Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 13,296,759 $ 12,854,359
Commercial and industrial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 4,440,924 4,114,292
Agricultural land, production and other loans to farmers    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 265,172 256,312
Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 836,033 792,144
Commercial real estate, non-owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 2,171,092 2,274,016
Commercial real estate, owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 1,226,797 1,157,944
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 2,397,094 2,374,729
Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 673,961 659,811
Individuals' loans for household and other personal expenditures    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 141,045 166,028
Public finance and other commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 1,144,641 $ 1,059,083