LOANS AND ALLOWANCE FOR LOAN LOSSES- Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Allowance for loan losses:
Beginning Balance	$ 7,817	$ 7,043	$ 3,998
Charge-offs	(5,623)	(3,141)	(2,721)
Recoveries	1,330	502	297
Provision for loan losses	6,245	3,413	5,469
Ending balance	9,769	7,817	7,043
Ending balance:
Individually evaluated for impairment				$ 487	$ 390
Collectively evaluated for impairment				7,960	6,129
Purchased credit-impaired				1,322	1,298
Total	7,817	7,043	3,998	9,769	7,817
Ending balance:
Individually evaluated for impairment				15,553	9,985
Collectively evaluated for impairment				2,920,061	2,682,925
Purchased credit-impaired				142,042	206,127
Financing Receivable, Gross				3,077,656	2,899,037
Commercial real estate
Allowance for loan losses:
Beginning Balance	2,796	2,419	1,524
Charge-offs	(1,096)	(366)	(20)
Recoveries	58	46	26
Provision for loan losses	1,924	697	889
Ending balance	3,682	2,796	2,419
Ending balance:
Individually evaluated for impairment				314	158
Collectively evaluated for impairment				2,976	2,177
Purchased credit-impaired				392	461
Total	2,796	2,419	1,524	3,682	2,796
Ending balance:
Individually evaluated for impairment				8,449	5,398
Collectively evaluated for impairment				1,354,977	1,227,597
Purchased credit-impaired				87,750	122,541
Financing Receivable, Gross				1,451,176	1,355,536
Commercial and industrial
Allowance for loan losses:
Beginning Balance	1,274	805	798
Charge-offs	(2,337)	(1,034)	(483)
Recoveries	746	88	23
Provision for loan losses	2,748	1,415	467
Ending balance	2,431	1,274	805
Ending balance:
Individually evaluated for impairment				106	229
Collectively evaluated for impairment				2,309	952
Purchased credit-impaired				16	93
Total	1,274	805	798	2,431	1,274
Ending balance:
Individually evaluated for impairment				2,623	2,343
Collectively evaluated for impairment				540,685	452,487
Purchased credit-impaired				9,813	14,018
Financing Receivable, Gross				553,121	468,848
Commercial Construction
Allowance for loan losses:
Beginning Balance	1,691	1,400	597
Charge-offs	(331)	(367)	(723)
Recoveries	0	69	47
Provision for loan losses	(494)	589	1,479
Ending balance	866	1,691	1,400
Ending balance:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				704	1,590
Purchased credit-impaired				162	101
Total	1,691	1,400	597	866	1,691
Ending balance:
Individually evaluated for impairment				177	910
Collectively evaluated for impairment				330,714	337,540
Purchased credit-impaired				14,413	32,357
Financing Receivable, Gross				345,304	370,807
Residential real estate
Allowance for loan losses:
Beginning Balance	1,237	1,673	940
Charge-offs	(509)	(591)	(672)
Recoveries	161	131	146
Provision for loan losses	368	24	1,259
Ending balance	1,257	1,237	1,673
Ending balance:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				837	681
Purchased credit-impaired				420	556
Total	1,237	1,673	940	1,257	1,237
Ending balance:
Individually evaluated for impairment				3,550	928
Collectively evaluated for impairment				315,030	328,693
Purchased credit-impaired				25,068	30,628
Financing Receivable, Gross				343,648	360,249
Construction and development
Allowance for loan losses:
Beginning Balance	194	187	18
Charge-offs	0	0	0
Recoveries	27	0	0
Provision for loan losses	16	7	169
Ending balance	237	194	187
Ending balance:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				233	194
Purchased credit-impaired				4	0
Total	194	187	18	237	194
Ending balance:
Individually evaluated for impairment				417	0
Collectively evaluated for impairment				44,630	28,436
Purchased credit-impaired				1,216	1,625
Financing Receivable, Gross				46,263	30,061
Home equity
Allowance for loan losses:
Beginning Balance	546	476	85
Charge-offs	(943)	(429)	(558)
Recoveries	187	123	39
Provision for loan losses	1,093	376	910
Ending balance	883	546	476
Ending balance:
Individually evaluated for impairment				67	3
Collectively evaluated for impairment				542	456
Purchased credit-impaired				274	87
Total	546	476	85	883	546
Ending balance:
Individually evaluated for impairment				337	406
Collectively evaluated for impairment				274,042	271,928
Purchased credit-impaired				3,521	4,328
Financing Receivable, Gross				277,900	276,662
Other consumer
Allowance for loan losses:
Beginning Balance	79	83	36
Charge-offs	(407)	(354)	(265)
Recoveries	151	45	16
Provision for loan losses	590	305	296
Ending balance	413	79	83
Ending balance:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				359	79
Purchased credit-impaired				54	0
Total	$ 79	$ 83	$ 36	413	79
Ending balance:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				59,983	36,244
Purchased credit-impaired				261	630
Financing Receivable, Gross				$ 60,244	$ 36,874