BUSINESS SEGMENTS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Number of Operating Segments | segment			2
Net interest income	$ 29,243	$ 26,972	$ 57,636	$ 52,563
Noninterest income	11,740	8,171	21,955	15,190
Total income	40,983	35,143	79,591	67,753
Provision for loan and lease losses	300	2,200	1,550	3,800
Compensation and benefits	15,826	12,751	30,405	24,664
Premises and equipment expense	3,406	3,033	6,676	5,849
FDIC expense	625	602	1,205	1,288
Other noninterest expense	5,084	3,709	9,992	7,598
Total noninterest expense	25,241	22,295	49,828	43,199
Income before income tax expense	15,742	12,848	29,763	24,554
Income tax expense	3,832	4,908	7,046	8,632
NET INCOME	11,910	7,940	22,717	15,922
Total assets for period end	4,265,174	4,165,679	4,265,174	4,165,679	$ 4,260,547
Banking [Member]
Net interest income	27,953	25,654	54,801	49,685
Noninterest income	3,353	2,953	4,980	5,047
Total income	31,306	28,607	59,781	54,732
Provision for loan and lease losses	300	2,200	1,550	3,800
Compensation and benefits	11,932	10,486	22,263	19,800
Premises and equipment expense	2,982	2,735	5,821	5,272
FDIC expense	625	602	1,205	1,288
Other noninterest expense	2,998	2,088	5,659	4,104
Total noninterest expense	18,837	18,111	36,498	34,264
Income before income tax expense	12,469	10,496	23,283	20,468
Income tax expense	3,033	4,023	5,512	7,196
NET INCOME	9,436	6,473	17,771	13,272
Total assets for period end	4,208,731	4,138,639	4,208,731	4,138,639
Wealth Management Division [Member]
Net interest income	1,290	1,318	2,835	2,878
Noninterest income	8,387	5,218	16,975	10,143
Total income	9,677	6,536	19,810	13,021
Provision for loan and lease losses	0	0	0	0
Compensation and benefits	3,894	2,265	8,142	4,864
Premises and equipment expense	424	298	855	577
FDIC expense	0	0	0	0
Other noninterest expense	2,086	1,621	4,333	3,494
Total noninterest expense	6,404	4,184	13,330	8,935
Income before income tax expense	3,273	2,352	6,480	4,086
Income tax expense	799	885	1,534	1,436
NET INCOME	2,474	1,467	4,946	2,650
Total assets for period end	$ 56,443	$ 27,040	$ 56,443	$ 27,040