LOANS AND ALLOWANCE FOR CREDIT LOSSES - Classes of loan portfolios (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	$ 24,532	$ 24,757
Interest Rate Reduction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	5	5
Term Extension
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	2,826	2,834
Combination
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	21,701	21,918
Construction and land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	1,516	1,553
Construction and land development | Combination
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	1,516	1,553
Other residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	2,744	2,750
Other residential | Term Extension
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	2,744	2,750
Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	20,260	20,442
Commercial real estate | Term Extension
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	75	77
Commercial real estate | Combination
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	20,185	20,365
Consumer
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	12	12
Consumer | Interest Rate Reduction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	5	5
Consumer | Term Extension
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loan modifications	$ 7	$ 7