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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of non-vested shares:
Non-vested beginning of period (in shares)	223,802	225,026	225,026
Non-vested end of period (in shares)			223,802	225,026
Restricted stock and RSU grants:
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share)	$ 24.68	$ 25.52
Value of stock vested during the year (based on grant price)	$ 2,825,000	$ 3,004,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share)	$ 23.62
Restricted stock and RSU grants
Total charge to operations:
Total charge to operations	$ 1,343,000	$ 976,000
Restricted stock
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)	$ 20.34	$ 28.10
Deferred compensation to be recognized over vesting period	$ 3,082,000	$ 4,202,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	701,675	674,250	674,250
Number of shares awarded	151,500	149,550
Vested during period (in shares)	(129,925)	(122,125)
Forfeitures (in shares)	(200)
Non-vested end of period (in shares)	723,050	701,675	701,675	674,250
Total charge to operations:
Total charge to operations	$ 897,000	$ 875,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 9,994,000
Weighted average vesting period	2 years 9 months 18 days
RSUs
Number of non-vested shares:
Number of shares awarded			75,026	77,776	76,250
Forfeitures (in shares)				(5,250)
Non-vested end of period (in shares)	223,802	225,026
Total charge to operations:
Total charge to operations	$ 446,000	$ 101,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 1,432,000
Weighted average vesting period	1 year 3 months 18 days
2019 Incentive Plan | Restricted stock and RSU grants
Number of non-vested shares:
Non-vested end of period (in shares)	450,952
2019 Incentive Plan | Restricted stock
Number of non-vested shares:
Non-vested end of period (in shares)	300,900
2019 Incentive Plan | RSUs
Number of non-vested shares:
Non-vested end of period (in shares)	150,052
2016 Incentive Plan | Restricted stock and RSU grants
Number of non-vested shares:
Non-vested end of period (in shares)	495,900
2016 Incentive Plan | Restricted stock
Number of non-vested shares:
Non-vested end of period (in shares)	422,150
2016 Incentive Plan | RSUs
Number of non-vested shares:
Number of shares awarded						76,250
Vested during period (in shares)			(24,343)
Forfeitures (in shares)			(51,907)
Non-vested end of period (in shares)	73,750
Pay-for-performance program | RSUs
Number of non-vested shares:
Vested during period (in shares)	0
Forfeitures (in shares)	0

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