FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation technique and additional information (Details) - Fair Value, Nonrecurring [Member]	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans	$ 708,000	$ 652,000
Level 3
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans	708,000	652,000
Collateral-dependent loans, valuation allowance	$ 0	$ 0
Level 3 | Appraisal adjustments | Minimum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.10
Level 3 | Appraisal adjustments | Maximum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.55
Level 3 | Appraisal adjustments | Weighted-average
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	(0.26)	(0.10)
Level 3 | Selling costs | Minimum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.07	0.08
Level 3 | Selling costs | Maximum
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	0.14	0.13
Level 3 | Selling costs | Weighted-average
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS
Collateral-dependent loans, measurement input	(0.10)	(0.10)