LOANS AND ALLOWANCE - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 12,465,582	$ 12,486,027
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,722,365	3,670,948
Agricultural land, production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	234,431	263,414
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	941,726	957,545
Commercial real estate, non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,368,360	2,400,839
Commercial real estate, owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,137,894	1,162,083
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,316,490	2,288,921
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	618,258	617,571
Individuals' loans for household and other personal expenditures
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	161,459	168,388
Public finance and other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 964,599	$ 956,318