LOANS AND ALLOWANCE - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 11,650,002	$ 9,241,861
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,330,529	2,714,565
Agricultural land, production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	221,954	246,442
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	828,923	523,066
Commercial real estate, non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,299,272	2,135,459
Commercial real estate, owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,268,567	986,720
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,990,668	1,159,127
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	621,619	523,754
Individuals' loans for household and other personal expenditures
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	173,225	146,092
Public finance and other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 915,245	$ 806,636