EARNINGS PER SHARE (Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Calculations of basic and diluted earnings per share
Outstanding stock options	0		0		220,200
Basic
Net Income (Loss)	$ 22,063	$ 24,955	$ 62,700	$ 67,165
Less: Earnings allocated to participating securities	(118)	(68)	(285)	(152)
Net income available to common stockholders	$ 21,945	$ 24,887	$ 62,415	$ 67,013
Weighted average common shares outstanding including participating securities	11,098,563	10,961,697	11,110,491	10,952,452
Less: Weighted average participating securities	(59,200)	(30,000)	(50,440)	(24,741)
Weighted average common shares outstanding	11,039,363	10,931,697	11,060,051	10,927,711
Basic earnings (in dollars per share)	$ 1.99	$ 2.28	$ 5.64	$ 6.13
Diluted
Net income allocated to common shareholders	$ 21,945	$ 24,887	$ 62,415	$ 67,013
Weighted average common shares outstanding for basic earnings per common share	11,039,363	10,931,697	11,060,051	10,927,711
Average shares and dilutive potential common shares	11,136,873	11,177,152	11,123,348	11,204,735
Diluted earnings (in dollars per share)	$ 1.97	$ 2.23	$ 5.61	$ 5.98
Employee Stock Option [Member]
Diluted
Add: Dilutive effects of assumed exercise of stock options		172,371		182,417
Performance-Based Restricted Stock Units (PRSUs)
Diluted
Dilutive effects of assumed vesting units	76,599	45,636	63,297	53,237
Restricted stock awards
Calculations of basic and diluted earnings per share
Number of antidilutive shares not considered in computing diluted earnings per share	253,029
Diluted
Dilutive effects of assumed vesting units	20,911	27,448		41,370