EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 5,742	$ 4,250	$ 5,057	$ 5,026	$ 4,830	$ 4,727	$ 4,728	$ 4,627	$ 20,075	$ 18,912	$ 14,845
Less allocation of earnings and dividends to participating securities									45	31	18
Net income allocated to common shareholders									$ 20,030	$ 18,881	$ 14,827
Weighted average common shares outstanding, gross (in shares)									12,943,622	13,100,161	11,950,360
Less average participating securities (in shares)									29,345	21,241	15,010
Weighted average number of shares outstanding used in the calculation of basic earnings per common share (in shares)									12,914,277	13,078,920	11,935,350
Add dilutive effect of:
Stock options (in shares)									307	3,973	6,903
Adjusted weighted average number of shares outstanding used in the calculation of diluted earnings per common share (in shares)									12,914,584	13,082,893	11,942,253
Earnings per common share:
Basic (in dollars per share)	$ 0.44	$ 0.33	$ 0.39	$ 0.39	$ 0.37	$ 0.36	$ 0.36	$ 0.35	$ 1.55	$ 1.44	$ 1.24
Diluted (in dollars per share)	$ 0.44	$ 0.33	$ 0.39	$ 0.39	$ 0.37	$ 0.36	$ 0.36	$ 0.35	$ 1.55	$ 1.44	$ 1.24
Stock Compensation Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)									0	0