LOANS AND ALLOWANCE - Allowance for Credit Losses, Off-balance Sheet (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	$ 19,500	$ 23,300	$ 23,300
Provision for credit losses - unfunded commitments	0	0	3,800
Ending balance	$ 19,500	$ 23,300	$ 19,500