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 [Abstract]
Income available to common stockholders									$ 24,196	$ 20,168	$ 14,819
Weighted average common shares outstanding (in shares)									14,639,775	13,634,439	13,322,716
Earnings per share (in dollars per share)	$ 0.40	$ 0.43	$ 0.40	$ 0.42	$ 0.39	$ 0.38	$ 0.33	$ 0.38	$ 1.65	$ 1.48	$ 1.11
Diluted earnings per share [Abstract]
Income available to common stockholders									$ 24,196	$ 20,168	$ 14,819
Weighted average common shares outstanding (in shares)									14,639,775	13,634,439	13,322,716
Add dilutive effects of potential additional common stock (in shares)									83,367	102,179	97,398
Weighted average common and dilutive potential Common shares outstanding (in shares)									14,723,142	13,736,618	13,420,114
Earnings per share assuming dilution (in dollars per share)	$ 0.40	$ 0.43	$ 0.40	$ 0.42	$ 0.39	$ 0.37	$ 0.32	$ 0.38	$ 1.64	$ 1.47	$ 1.10
Stock Options [Member]
Earnings Per Share [Abstract]
Securities not considered in computing diluted earnings per share (in shares)									0	0	0