FAIR VALUE - Narrative (Details)	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) loan	Mar. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) loan
Summary of assets measured on a recurring and nonrecurring basis
Transfer of loans held for investment to loans held for sale			$ 39,200,000
Value of loans sold				$ 40,800,000
90 days or more past due, fair value and still accruing	$ 0			$ 0
Number of Loans, Non-accruals, fair value | loan	2			98
Fair Value Carrying Amount	$ 200,000			$ 200,000
Net charge-offs on loans accounted for under the fair value option	(400,000)	$ (400,000)
Other real estate owned, gross	0			0
Charge-offs	11,000	$ 17,000		8,800,000
Significant Unobservable Inputs (Level 3)
Summary of assets measured on a recurring and nonrecurring basis
Provision for loan losses, specific reserves	$ 6,100,000			$ 3,800,000