SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]
Interest income	$ 18,934		$ 19,324		$ 20,034		$ 19,427		$ 18,805		$ 18,206		$ 18,576		$ 17,193		$ 77,719	$ 72,780	$ 65,053
Interest expense	878		936		1,012		1,103		988		828		755		676		3,929	3,247	2,519
Net interest income	18,056		18,388		19,022		18,324		17,817		17,378		17,821		16,517		73,790	69,533	62,534
(Credit) provision for loan losses	(400)		(350)		0		250		0		350		0		250		(500)	600	1,000
Net interest income after (credit) provision for loan losses	18,456		18,738		19,022		18,074		17,817		17,028		17,821		16,267		74,290	68,933	61,534
Non-interest income	2,028		2,322		2,241		1,892		2,026		2,427		2,050		2,091		8,483	8,594	10,900
Operating expenses	15,382	[1]	13,467	[1]	13,319	[1]	13,152	[1]	15,004	[1]	12,668	[1]	13,174	[1]	13,108	[1]	55,320	53,954	53,419
Income tax expense	1,369		2,118		2,159		1,976		1,202		1,864		1,579		1,241		7,622	5,886	3,720
NET INCOME	$ 3,733		$ 5,475		$ 5,785		$ 4,838		$ 3,637		$ 4,923		$ 5,118		$ 4,009		$ 19,831	$ 17,687	$ 15,295
Net income per common share - basic (in dollars per share)	$ 0.31		$ 0.46		$ 0.49		$ 0.41		$ 0.31		$ 0.42		$ 0.44		$ 0.34		$ 1.67	$ 1.50	$ 1.32
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	0.31		0.46		0.48		0.41		0.31		0.42		0.43		0.34		$ 1.66	$ 1.49	$ 1.31
Cash dividends per common share (in dollars per share)	$ 0.10		$ 0.10		$ 0.10		$ 0.10		$ 0.10		$ 0.10		$ 0.06		$ 0.06
Merger costs	$ 1,800																$ 2,434	$ 0	$ 0
System conversion expense									$ 1,400

[1] 4th quarter 2016 amount included $1.8 million in merger costs; 4th quarter 2015 amount included $1.4 million in systems conversion expense.