EARNINGS PER SHARE - Earnings Per Share Computations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 25,977	$ 28,525	$ 25,673	$ 23,642	$ 24,283	$ 24,119	$ 24,348	$ 22,983	$ 103,817	$ 95,733	$ 84,337
Weighted-average common shares outstanding (in shares)									25,528,328	25,475,994	25,469,242
Basic earnings per common share (in USD per share)	$ 1.02	$ 1.12	$ 1.00	$ 0.93	$ 0.95	$ 0.95	$ 0.96	$ 0.90	$ 4.07	$ 3.76	$ 3.31
Diluted earnings per common share:
Net income	$ 25,977	$ 28,525	$ 25,673	$ 23,642	$ 24,283	$ 24,119	$ 24,348	$ 22,983	$ 103,817	$ 95,733	$ 84,337
Add: Dilutive effect of assumed exercises of stock options and awards (in shares)									184,210	144,111	104,699
Weighted Average Number of Shares Outstanding, Diluted, Total									25,712,538	25,620,105	25,573,941
Diluted earnings per common share (in USD per share)	$ 1.01	$ 1.11	$ 1.00	$ 0.92	$ 0.95	$ 0.94	$ 0.95	$ 0.90	$ 4.04	$ 3.74	$ 3.30
Number of antidilutive stock options									0	0	0