LOANS AND ALLOWANCE - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 12,241,461	$ 12,003,894
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,502,204	3,437,126
Agricultural land, production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	219,598	241,793
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	960,979	835,582
Commercial real estate, non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,375,410	2,407,475
Commercial real estate, owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,244,117	1,246,528
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,185,943	2,096,655
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	621,354	630,632
Individuals' loans for household and other personal expenditures
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	172,389	175,211
Public finance and other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 959,467	$ 932,892