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FAIR VALUE MEASUREMENTS - Fair Value of Derivatives (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Interest rate derivatives | Cash flow hedges
FAIR VALUE MEASUREMENTS
Number of interest rate derivatives held | item	23
Number of mortgage loans outstanding | item	23
Notional Amount	$ 84,671,000
Weighted average maturity	3 years 10 months 24 days
Weighted average annual interest rate (as a percent)	3.95%
Interest rate derivatives | Cash flow hedges | Minimum
FAIR VALUE MEASUREMENTS
Fixed interest rate (as a percent)	3.02%
Interest rate derivatives | Cash flow hedges | Maximum
FAIR VALUE MEASUREMENTS
Fixed interest rate (as a percent)	5.16%
Interest rate swap | Level 2 | Other assets
Financial assets:
Derivative financial instruments		$ 87,000
Interest rate swap | Level 2 | Other liabilities
Financial liabilities:
Derivative financial instruments	$ 5,012,000	$ 1,715,000

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