LOANS AND ALLOWANCE FOR CREDIT LOSSES - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 12,646,808	$ 12,486,027
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4,041,217	3,670,948
Agricultural land, production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	238,743	263,414
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	814,704	957,545
Commercial real estate, non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,251,351	2,400,839
Commercial real estate, owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,152,751	1,162,083
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,366,943	2,288,921
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	641,188	617,571
Individuals' loans for household and other personal expenditures
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	158,480	168,388
Public finance and other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 981,431	$ 956,318