FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Financial Assets and Liabilities Measured at Fair Value (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Level 1 | Interest rate swap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative liability	$ 0
Level 1 | Real Estate Investment
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	0
Level 2 | Interest rate swap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative liability	23
Level 2 | Real Estate Investment
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	0
Level 3 | Interest rate swap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative liability	0
Level 3 | Real Estate Investment
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	4,379
Estimated fair value | Interest rate swap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative liability	23
Estimated fair value | Real Estate Investment
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	$ 4,379