LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Amortized Cost Basis of Collateral-Dependent Nonaccrual Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	$ 26,602	$ 25,701
Consumer [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	770	1,002
Other Commercial Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	7,828	2,582
Other Agricultural Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	403	537
Real Estate [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	17,601	21,580
Real Estate [Member] | Consumer [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Real Estate [Member] | Other Commercial Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Real Estate [Member] | Other Agricultural Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Other [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	8,231	3,119
Other [Member] | Consumer [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Other [Member] | Other Commercial Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	7,828	2,582
Other [Member] | Other Agricultural Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	403	537
None [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	770	1,002
None [Member] | Consumer [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	770	1,002
None [Member] | Other Commercial Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
None [Member] | Other Agricultural Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Mortgages [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	3,382	2,706
Mortgages [Member] | Real Estate [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	3,382	2,706
Mortgages [Member] | Other [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Mortgages [Member] | None [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Home Equity [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	61	165
Home Equity [Member] | Real Estate [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	61	165
Home Equity [Member] | Other [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Home Equity [Member] | None [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Commercial [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	11,497	14,364
Commercial [Member] | Real Estate [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	11,497	14,364
Commercial [Member] | Other [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Commercial [Member] | None [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Agricultural [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	2,145	4,062
Agricultural [Member] | Real Estate [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	2,145	4,062
Agricultural [Member] | Other [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Agricultural [Member] | None [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Construction [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	516	283
Construction [Member] | Real Estate [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	516	283
Construction [Member] | Other [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	0	0
Construction [Member] | None [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Financing Receivable, Nonaccrual	$ 0	$ 0