EARNINGS PER SHARE - Schedule of computation of earnings per common share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income per share calculations for basic and diluted methods
Net income	$ 128,311	$ 123,449	$ 100,344
Shares:
Weighted average number of common shares outstanding, basic (in shares)	55,387,073	55,369,476	54,567,429
Weighted average number of common shares outstanding, diluted (in shares)	56,137,164	56,008,805	54,826,939
Basic earnings per common share (in dollars per share)	$ 2.32	$ 2.23	$ 1.84
Diluted earnings per common share (in dollars per share)	$ 2.29	$ 2.20	$ 1.83
Options
Shares:
Dilutive effect of common stock equivalents (in shares)	1,632	1,639	900
Warrants
Shares:
Dilutive effect of common stock equivalents (in shares)	1,753	1,753	1,469
RSU awards
Shares:
Dilutive effect of common stock equivalents (in shares)	665,998	615,759	252,153
PSU awards
Shares:
Dilutive effect of common stock equivalents (in shares)	58,206	5,429	0
DSU awards
Shares:
Dilutive effect of common stock equivalents (in shares)	15,532	10,641	4,988
ESPP
Shares:
Dilutive effect of common stock equivalents (in shares)	6,970	4,108	0