SHAREHOLDERS’ EQUITY AND EARNINGS PER COMMON SHARE - 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
Equity [Abstract]
Net income	$ 4,207	$ 5,015	$ 6,117	$ 7,281	$ 7,620	$ 8,970	$ 8,535	$ 7,812	$ 22,620	$ 32,937	$ 25,993
Average number of basic common shares outstanding	15,554,000	15,547,000	15,538,000	15,523,000	15,516,000	15,503,000	15,482,000	15,448,000	15,540,884	15,487,686	15,183,615
Plus: dilutive effect of stock options and awards outstanding									46,109	76,778	106,795
Average number of diluted common shares outstanding	15,602,000	15,581,000	15,586,000	15,587,000	15,574,000	15,580,000	15,571,000	15,553,000	15,586,993	15,564,464	15,290,410
Anti-dilutive options excluded from earnings calculation									0	7,991	8,659
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 0.27	$ 0.32	$ 0.39	$ 0.47	$ 0.49	$ 0.58	$ 0.55	$ 0.51	$ 1.46	$ 2.13	$ 1.71
Diluted (in dollars per share)	$ 0.27	$ 0.32	$ 0.39	$ 0.47	$ 0.49	$ 0.58	$ 0.55	$ 0.50	$ 1.45	$ 2.12	$ 1.70