FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation technique and additional information (Details) - Nonrecurring - Level 3	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans	$ 2,388,000	$ 652,000
Collateral-dependent loans, valuation allowance	$ 135,000	$ 0
Appraisal adjustments
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input		0.10
Appraisal adjustments | Minimum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.10
Appraisal adjustments | Maximum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.55
Appraisal adjustments | Weighted-average
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.26	0.10
Selling costs | Minimum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.07	0.08
Selling costs | Maximum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.14	0.13
Selling costs | Weighted-average
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.10	0.10