SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic earnings per share computation [Abstract]
Net income applicable to common stock	$ 29,060	$ 29,118	$ 25,103
Weighted average common shares outstanding (in shares)	3,969,722	3,984,085	3,883,027
Earnings per share - basic (in dollars per share)	$ 7.32	$ 7.31	$ 6.46
Diluted earnings per share computation [Abstract]
Net income applicable to common stock	$ 29,060	$ 29,118	$ 25,103
Weighted average common shares outstanding for basic earnings per share (in shares)	3,969,722	3,984,085	3,883,027
Add: Dilutive effects of restricted stock (in shares)	0	0	1,841
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,969,722	3,984,085	3,884,868
Earnings per share - dilutive (in dollars per share)	$ 7.32	$ 7.31	$ 6.46
Restricted Stock [Member]
Antidilutive Securities [Abstract]
Antidilutive restricted stock excluded from net income per share calculations (in shares)	5,458	5,494	4,302
Restricted Stock [Member] | Minimum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)	$ 44.93	$ 44.93	$ 58.37
Restricted Stock [Member] | Maximum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)	$ 74.27	$ 63.19	$ 62.93