LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) borrower	Jun. 30, 2022 USD ($) borrower	Dec. 31, 2022 USD ($)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Average loans	$ 183,240,000	$ 204,477,000
Net charge-offs to average loans (annualized)	0.03%	0.01%
Number of borrowers | borrower	5	8
Loans charged off	$ 88,000	$ 107,000	$ 392,000
Outstanding commitments	30,700,000	30,200,000
Unfunded commitments
Beginning balance	477,000	371,000	371,000
Reduction of unfunded reserve	(4,000)	(17,000)
Provisions charged to operations	23,000	59,000
Ending balance	$ 496,000	$ 413,000	$ 477,000