LOANS AND ALLOWANCE FOR CREDIT LOSSES - Collateral dependent loans (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Collateral-dependent loans
Total	$ 934,599,000	$ 911,078,000	$ 881,038,000
Real Estate
Collateral-dependent loans
Total	3,559,000	4,005,000
Other
Collateral-dependent loans
Total	309,000	920,000
Real Estate
Collateral-dependent loans
Total	836,213,000	811,493,000	784,126,000
Real Estate | Real Estate
Collateral-dependent loans
Total	3,452,000	4,005,000
Agricultural
Collateral-dependent loans
Total	1,008,000	671,000	708,000
Agricultural | Other
Collateral-dependent loans
Total	309,000	309,000
Commercial and Industrial
Collateral-dependent loans
Total	66,804,000	66,909,000	$ 62,866,000
Commercial and Industrial | Real Estate
Collateral-dependent loans
Total	$ 107,000
Commercial and Industrial | Other
Collateral-dependent loans
Total		$ 611,000