SHARE-BASED COMPENSATION - Summary of Activity of Non-Performance-Based & Performance-Based Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Stock Option Activity, Shares
Options assumed pursuant to acquisition of Fidelity (in shares)	576,588
Non-Performance-Based
Stock Option Activity, Shares
Under option, beginning of year (in shares)	387,193	0
Options assumed pursuant to acquisition of Fidelity (in shares)		576,588
Exercised (in shares)	(107,498)	(189,395)
Under option, end of year (in shares)	279,695	387,193
Exercisable at end of year (in shares)	279,695	387,193
Stock Options Weighted Average Exercise Price
Under option, beginning of year, Weighted-Average Exercise Price (in dollars per share)	$ 26.51	$ 0
Options assumed pursuant to acquisition of Fidelity, Weighted-Average Exercise Price (in dollars per share)		26.62
Exercised, Weighted-Average Exercise Price (in dollars per share)	22.26	26.85
Under option, end of year, Weighted-Average Exercise Price (in dollars per share)	28.13	26.51
Exercisable at end of year, Weighted-Average Exercise Price (in dollars per share)	$ 28.13	$ 26.51
Stock Option Activity, Additional Disclosures
Under option, end of year, Weighted Average Contractual Term	1 year 3 months 3 days	1 year 10 months 28 days
Exercisable at end of year, Weighted Average Contractual Term	1 year 3 months 3 days	1 year 10 months 28 days
Exercised, Aggregate Intrinsic Value	$ 1,128	$ 2,437
Under option, end of year, Aggregate Intrinsic Value	2,780	6,208
Exercisable at end of year, Aggregate Intrinsic Value	$ 2,780	$ 6,208
Performance-Based
Stock Option Activity, Shares
Under option, beginning of year (in shares)	0	7,711
Options assumed pursuant to acquisition of Fidelity (in shares)		0
Exercised (in shares)	0	(7,711)
Under option, end of year (in shares)	0	0
Exercisable at end of year (in shares)	0	0
Stock Options Weighted Average Exercise Price
Under option, beginning of year, Weighted-Average Exercise Price (in dollars per share)	$ 0	$ 6.94
Options assumed pursuant to acquisition of Fidelity, Weighted-Average Exercise Price (in dollars per share)		0
Exercised, Weighted-Average Exercise Price (in dollars per share)	0	6.94
Under option, end of year, Weighted-Average Exercise Price (in dollars per share)	0	0
Exercisable at end of year, Weighted-Average Exercise Price (in dollars per share)	$ 0	$ 0
Stock Option Activity, Additional Disclosures
Under option, end of year, Weighted Average Contractual Term	0 years	0 years
Exercisable at end of year, Weighted Average Contractual Term	0 years	0 years
Exercised, Aggregate Intrinsic Value	$ 0	$ 229
Under option, end of year, Aggregate Intrinsic Value	0	0
Exercisable at end of year, Aggregate Intrinsic Value	$ 0	$ 0