LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 118,203	$ 71,773
Nonaccrual Loans with no Allowance for Credit Losses	17,353	27,844
Commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	51,072	10,548
Nonaccrual Loans with no Allowance for Credit Losses	575	2,174
Agricultural land, production and other loans to farmers
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	192	250
Nonaccrual Loans with no Allowance for Credit Losses	0	0
Construction
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	9,775	22,481
Nonaccrual Loans with no Allowance for Credit Losses	9,775	22,482
Commercial real estate, non-owner occupied
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	8,857	837
Nonaccrual Loans with no Allowance for Credit Losses	0	0
Commercial real estate, owner occupied
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	8,415	3,705
Nonaccrual Loans with no Allowance for Credit Losses	6,288	3,188
Residential
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	33,205	29,774
Nonaccrual Loans with no Allowance for Credit Losses	155	0
Home equity
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	6,581	4,158
Nonaccrual Loans with no Allowance for Credit Losses	560	0
Individuals' loans for household and other personal expenditures
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	18	20
Nonaccrual Loans with no Allowance for Credit Losses	0	0
Public finance and other commercial loans
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	88	0
Nonaccrual Loans with no Allowance for Credit Losses	$ 0	$ 0