LOANS AND ALLOWANCE - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 12,270,233	$ 12,003,894
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,531,395	3,437,126
Agricultural land, production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	230,003	241,793
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	949,918	835,582
Commercial real estate, non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,379,819	2,407,475
Commercial real estate, owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,179,739	1,246,528
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,248,473	2,096,655
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	614,366	630,632
Individuals' loans for household and other personal expenditures
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	172,896	175,211
Public finance and other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 963,624	$ 932,892