BUSINESS SEGMENTS (Details) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) segments	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Number of Operating Segments | segments													2
Net interest income	$ 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
Noninterest income													23,714	20,807	20,595
Total income													108,166	88,701	73,371
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
Salaries and benefits													40,278	36,241	32,249
Premises and equipment													11,569	9,963	9,914
Other noninterest expense													17,079	13,336	13,020
Total noninterest expense													76,026	64,415	58,608
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
Total assets at period end	3,364,659				2,702,397				1,966,948				3,364,659	2,702,397	1,966,948
Banking [Member]
Net interest income													80,190	64,148	49,209
Noninterest income													6,434	5,336	6,417
Total income													86,624	69,484	55,626
Provision for loan losses													7,100	4,875	3,425
Salaries and benefits													32,133	28,679	26,504
Premises and equipment													10,634	9,207	9,331
Other noninterest expense													12,203	8,922	8,564
Total noninterest expense													62,070	51,683	47,824
Income before income tax expense													24,554	17,801	7,802
Income tax expense													9,217	6,873	2,908
Net income													15,337	10,928	4,894
Total assets at period end	3,328,937				2,676,103				1,964,514				3,328,937	2,676,103	1,964,514
Wealth Management Division [Member]
Net interest income													4,262	3,746	3,567
Noninterest income													17,280	15,471	14,178
Total income													$ 21,542	$ 19,217	$ 17,745
Provision for loan losses
Salaries and benefits													$ 8,145	$ 7,562	$ 5,745
Premises and equipment													935	756	583
Other noninterest expense													4,876	4,414	4,456
Total noninterest expense													13,956	12,732	10,784
Income before income tax expense													7,586	6,485	6,961
Income tax expense													2,951	2,523	2,594
Net income													4,635	3,962	4,367
Total assets at period end	$ 38,440				$ 26,294				$ 2,434				$ 38,440	$ 26,294	$ 2,434