EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
EARNINGS PER SHARE
Weighted-average anti-dilutive stock options outstanding (in shares)	400,000	200,000	300,000	100,000
Basic earnings per share
Net income	$ 48,691	$ 45,336	$ 135,551	$ 146,130
Income attributable to unvested stock-based compensation awards	(142)	(110)	(386)	(340)
Income available to common shareholders	$ 48,549	$ 45,226	$ 135,165	$ 145,790
Weighted-average common shares outstanding - basic (in shares)	53,830,000	54,025,000	53,915,000	53,960,000
Basic earnings per share	$ 0.90	$ 0.84	$ 2.51	$ 2.70
Diluted earnings per share
Net income	$ 48,691	$ 45,336	$ 135,551	$ 146,130
Income attributable to unvested stock-based compensation awards	(142)	(110)	(386)	(340)
Income available to common shareholders	$ 48,549	$ 45,226	$ 135,165	$ 145,790
Weighted-average common shares outstanding (in shares)	53,830,000	54,025,000	53,915,000	53,960,000
Assumed exercise of stock options (in shares)	302,000	385,000	328,000	431,000
Weighted-average common shares outstanding - diluted (in shares)	54,132,000	54,410,000	54,243,000	54,391,000
Diluted earnings per share	$ 0.90	$ 0.83	$ 2.49	$ 2.68
Cash dividends declared per share (in dollars per share)	$ 0.44	$ 0.43	$ 1.30	$ 1.27
Stock Repurchase Program
Number of common shares authorized to be repurchased (in shares)					2,700,000	2,680,000
Number of common shares repurchased (in shares)			250,000	0