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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted stock and RSU grants
Restricted stock and RSU grants (based on grant price):
Weighted average per share value of non-vested shares (in dollars per share)	$ 26.26	$ 25.04	$ 24.98
Value of stock vested during the period	$ 5,535,000	$ 5,165,000	$ 3,589,000
Weighted average per share value of shares forfeited during the period (in dollars per share)	$ 29.12	$ 24.62	$ 24.03
Total charge to operations:
Total charge to operations	$ 5,507,000	$ 5,433,000	$ 4,686,000
Restricted stock grants
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)	$ 33.75	$ 20.34	$ 28.10
Deferred compensation to be recognized over vesting period	$ 5,183,000	$ 3,082,000	$ 4,202,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	706,450	701,675	674,250
Number of shares awarded	153,575	151,500	149,550
Vested during period (in shares)	(146,900)	(145,725)	(122,125)
Forfeitures (in shares)	(750)	(1,000)
Non-vested end of period (in shares)	712,375	706,450	701,675	674,250
Total charge to operations:
Total charge to operations	$ 4,057,000	$ 3,734,000	$ 3,529,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 8,239,000
Weighted average vesting period	2 years 1 month 6 days
Restricted stock units
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)	$ 26.44	$ 30.46	$ 17.31
Deferred compensation to be recognized over vesting period	$ 1,420,000	$ 1,808,000	$ 850,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	230,752	223,802	225,026
Number of shares awarded	85,350	80,700	75,026
Vested during period (in shares)	(64,488)	(73,750)	(24,343)
Forfeitures (in shares)	(10,538)		(51,907)
Non-vested end of period (in shares)	241,076	230,752	223,802	225,026
Total charge to operations:
Total charge to operations	$ 1,450,000	$ 1,699,000	$ 1,157,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 2,301,000
Weighted average vesting period	1 year 6 months
Restricted stock units | Awards granted in 2018
Number of non-vested shares:
Forfeitures (in shares)				(2,500)
Restricted stock units | Awards granted in 2019
Number of non-vested shares:
Forfeitures (in shares)				(2,750)
ROC Awards
Number of non-vested shares:
Vested during period (in shares)	0
Forfeitures (in shares)	0
Total charge to operations:
Weighted average vesting period		3 years

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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