v3.26.1
LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Composition of Loan Portfolio by Loan Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 15,530,737 $ 13,791,707
Commercial and industrial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 4,720,441 4,478,282
Agricultural land, production and other loans to farmers    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 323,348 283,125
Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 874,419 804,775
Commercial real estate, non-owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 3,271,620 2,338,666
Commercial real estate, owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 1,368,627 1,237,100
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 2,361,480 2,420,310
Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 1,118,662 710,980
Individuals' loans for household and other personal expenditures    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 149,878 155,436
Public finance and other commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 1,342,262 $ 1,363,033