FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation technique and additional information (Details) - Nonrecurring	Sep. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
Discontinued Operations, Held-For-Sale
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Discontinued operations assets held for sale	$ 1,148,000
Level 3
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans	4,900,000	$ 2,400,000
Collateral-dependent loans, valuation allowance	172,000	$ 135,000
Level 3 | Discontinued Operations, Held-For-Sale
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Discontinued operations assets held for sale	$ 1,148,000
Level 3 | Appraisal adjustments
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	10
Level 3 | Appraisal adjustments | Minimum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input		10
Level 3 | Appraisal adjustments | Maximum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input		55
Level 3 | Appraisal adjustments | Weighted-average
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	10	26
Level 3 | Selling costs | Minimum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	2	7
Level 3 | Selling costs | Maximum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	23	14
Level 3 | Selling costs | Weighted-average
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	12	10