SUPPLEMENTAL DATA (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SUPPLEMENTAL DATA (unaudited) [Abstract]
Interest income	$ 27,123	$ 25,806	$ 23,852	$ 22,361	$ 20,786	$ 19,210	$ 18,630	$ 16,949	$ 15,738	$ 14,423	$ 13,460	$ 13,432	$ 99,142	$ 75,575	$ 57,053
Interest expense	4,304	4,100	3,508	2,778	2,434	2,162	1,707	1,378	1,210	1,050	1,012	1,005	14,690	7,681	4,277
Net interest income before provision for loan losses	22,819	21,706	20,344	19,583	18,352	17,048	16,923	15,571	14,528	13,373	12,448	12,427	84,452	67,894	52,776
Provision for loan losses	1,950	1,600	2,200	1,350	1,250	1,150	1,150	1,325	1,325	750	500	850	7,100	4,875	3,425
Wealth management fee income	4,307	4,169	4,532	4,031	3,822	3,661	4,005	3,754	3,547	3,295	3,628	3,368	17,039	15,242	13,838
Securities gains/(losses), net		83	176	268	44	39	79	98	125	188	238	289	527	260	840
Other income	1,416	1,358	1,791	1,583	1,421	1,352	1,389	1,143	1,301	1,299	1,370	1,947
Operating expenses	19,993	16,899	16,266	15,768	15,578	14,693	14,930	14,339	14,646	14,165	14,079	12,293
Income before income tax expense	6,599	8,817	8,377	8,347	6,811	6,257	6,316	4,902	3,530	3,240	3,105	4,888	32,140	24,286	14,763
Income tax expense	2,256	3,434	3,139	3,339	2,599	2,393	2,533	1,871	1,135	1,276	1,096	1,995	12,168	9,396	5,502
Net income	$ 4,343	$ 5,383	$ 5,238	$ 5,008	$ 4,212	$ 3,864	$ 3,783	$ 3,031	$ 2,395	$ 1,964	$ 2,009	$ 2,893	$ 19,972	$ 14,890	$ 9,261
EARNINGS PER COMMON SHARE
Earnings per share-basic	$ 0.28	$ 0.35	$ 0.34	$ 0.34	$ 0.32	$ 0.33	$ 0.32	$ 0.26	$ 0.25	$ 0.22	$ 0.23	$ 0.33	$ 1.31	$ 1.23	$ 1.02
Earnings per share-diluted	$ 0.28	$ 0.35	$ 0.34	$ 0.33	$ 0.32	$ 0.32	$ 0.32	$ 0.26	$ 0.25	$ 0.22	$ 0.22	$ 0.32	$ 1.29	$ 1.22	$ 1.01