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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic earnings per share computation [Abstract]
Net income applicable to common stock	$ 5,043	$ 5,196	$ 4,846	$ 4,405	$ 4,515	$ 4,581	$ 4,691	$ 4,247	$ 19,490	$ 18,034	$ 13,025
Weighted average common shares outstanding (in shares)									3,520,832	3,539,674	3,550,094
Earnings per share - basic (in dollars per share)	$ 1.43	$ 1.48	$ 1.38	$ 1.24	$ 1.28	$ 1.30	$ 1.32	$ 1.19	$ 5.54	$ 5.09	$ 3.67
Diluted earnings per share computation [Abstract]
Net income applicable to common stock	$ 5,043	$ 5,196	$ 4,846	$ 4,405	$ 4,515	$ 4,581	$ 4,691	$ 4,247	$ 19,490	$ 18,034	$ 13,025
Weighted average common shares outstanding for basic earnings per share (in shares)									3,520,832	3,539,674	3,550,094
Add: Dilutive effects of restricted stock (in shares)									2,096	1,988	1,724
Weighted average common shares outstanding for dilutive earnings per share (in shares)									3,522,928	3,541,662	3,551,818
Earnings per share - dilutive (in dollars per share)	$ 1.43	$ 1.48	$ 1.38	$ 1.24	$ 1.28	$ 1.30	$ 1.32	$ 1.19	$ 5.53	$ 5.09	$ 3.67
Restricted Stock [Member]
Antidilutive Securities [Abstract]
Antidilutive restricted stock excluded from net income per share calculations (in shares)									3,576	3,201	3,403
Restricted Stock [Member] | Minimum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)									$ 52.44	$ 47.81	$ 46.69
Restricted Stock [Member] | Maximum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)									$ 62.93	$ 61.04	$ 53.15

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