LOANS AND ALLOWANCE FOR CREDIT LOSSES - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 13,004,905	$ 12,854,359
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4,306,597	4,114,292
Agricultural land, production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	243,864	256,312
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	793,175	792,144
Commercial real estate, non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,177,869	2,274,016
Commercial real estate, owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,214,739	1,157,944
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,389,852	2,374,729
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	650,499	659,811
Individuals' loans for household and other personal expenditures
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	140,954	166,028
Public finance and other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 1,087,356	$ 1,059,083