LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Modifications to Borrowers Experiencing Financial Difficulty (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) Loan	Dec. 31, 2024 USD ($) Loan	Dec. 31, 2023 USD ($) Loan
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan	9	1	9
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 13,561	$ 12	$ 2,566
Non Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan	5	1	9
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 1,588	$ 149	$ 1,684
Other Commercial Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan	1		1
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 178		$ 610
Accruing modified loans to borrowers experiencing financial difficulty, % of total class financing receivables	0.10%		0.45%
Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term	10 years		60 months
Non Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan		1	5
Non Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term		120 months	13 months
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis		$ 149	$ 1,108
Non Accruing modified loans to borrowers experiencing financial difficulty, % of total class financing receivables		0.11%	0.81%
Mortgages [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan	1	1	1
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 108	$ 12	$ 126
Accruing modified loans to borrowers experiencing financial difficulty, % of total class financing receivables	0.04%	0.00%	0.04%
Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term	5 years	4 months	4 months
Accruing modified loans to borrowers experiencing financial difficulty, amortization term	30 years
Non Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan			1
Non Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term			10 months
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis			$ 315
Non Accruing modified loans to borrowers experiencing financial difficulty, % of total class financing receivables			0.10%
Commercial [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan	7		4
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 13,275		$ 1,142
Accruing modified loans to borrowers experiencing financial difficulty, % of total class financing receivables	1.09%		0.10%
Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term	1 year		4 months
Non Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan	4		3
Non Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term	20 years
Non Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term	5 years		5 months
Non Accruing modified loans to borrowers experiencing financial difficulty, amortization term	30 years
Non Accruing modified loans to borrowers experiencing financial difficulty, Number of loans | Loan	3
Non Accruing modified loans to borrowers experiencing financial difficulty, Number of loans | Loan	1
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 1,369		$ 261
Non Accruing modified loans to borrowers experiencing financial difficulty, % of total class financing receivables	0.11%		0.02%
Agricultural [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan			3
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis			$ 688
Accruing modified loans to borrowers experiencing financial difficulty, % of total class financing receivables			0.22%
Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term			5 months
Non Accruing modified loans to borrowers experiencing financial difficulty, Number of loans (in Loan) | Loan	1
Non Accruing modified loans to borrowers experiencing financial difficulty, weighted average debt instrument term	5 years
Non Accruing modified loans to borrowers experiencing financial difficulty, amortization term	12 years
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 219
Non Accruing modified loans to borrowers experiencing financial difficulty, % of total class financing receivables	0.06%
Current Member [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 13,561
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	1,588
Current Member [Member] | Other Commercial Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	178
Current Member [Member] | Mortgages [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	108
Current Member [Member] | Commercial [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	13,275
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	1,369
Current Member [Member] | Agricultural [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	219
30-89 Days Past Due [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
30-89 Days Past Due [Member] | Other Commercial Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
30-89 Days Past Due [Member] | Mortgages [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
30-89 Days Past Due [Member] | Commercial [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
30-89 Days Past Due [Member] | Agricultural [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
90 Days Or Greater [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
90 Days Or Greater [Member] | Other Commercial Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
90 Days Or Greater [Member] | Mortgages [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
90 Days Or Greater [Member] | Commercial [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	0
90 Days Or Greater [Member] | Agricultural [Member] | Real Estate Loans [Member]
LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES [Abstract]
Non Accruing modified loans to borrowers experiencing financial difficulty, Amortized cost basis	$ 0