FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - Level 2 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Market valuation | Junior subordinated notes
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	4.22%	6.41%
Market valuation | Mortgages | Minimum
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	2.87%	3.89%
Market valuation | Mortgages | Maximum
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	3.28%	4.33%
Estimated fair value | Junior subordinated notes
Financial Instruments Not Measured at Fair Value
Estimated fair value lower than carrying value	$ 8,670	$ 9,589
Estimated fair value | Mortgages
Financial Instruments Not Measured at Fair Value
Estimated fair value lower than carrying value	$ 3,831	$ 321