FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Level 3 Valuation Techniques Recurring (Details) - Recurring fair value measurements - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Valuation Techniques and the Unobservable Inputs
Fair value	$ 2,649,000	$ 2,329,000
Valuation Technique, Discounted cash flow
Valuation Techniques and the Unobservable Inputs
Fair value	$ 2,649,000	$ 2,329,000
Valuation Technique, Discounted cash flow | Servicing rights.
Valuation Techniques and the Unobservable Inputs
Discount rate	13.00%	13.00%
Weighted-average PSA	141.00%	209.00%
Servicing fees of loan balances	0.25%	0.25%
Servicing fees of payments are late	4.00%	4.00%
Late fees assessed	5.00%	5.00%
Miscellaneous fees per account per month	$ 1.94	$ 1.94
Monthly servicing cost per account	6.00	6.00
Additional monthly servicing cost per loan on loans more than 30 days delinquent	$ 24.00	$ 24.00
Servicing costs of loans more than 30 days delinquent	1.50%	1.50%
Annual increase in servicing costs	3.00%	3.00%