LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Allowance for loan losses
Beginning balance	$ 8,284	$ 7,213	$ 7,817	$ 7,043
Charge-offs	(1,225)	(335)	(1,990)	(1,494)
Recoveries	305	109	576	148
Provision for loan losses	994	464	1,955	1,754
Ending balance	8,358	7,451	8,358	7,451
Ending balance:
Individually evaluated for impairment					$ 550	$ 390
Collectively evaluated for impairment					6,450	6,129
Total	8,284	7,213	7,817	7,043	8,358	7,817
Ending balance:
Individually evaluated for impairment					18,176	9,985
Collectively evaluated for impairment					2,769,055	2,682,925
Purchased credit-impaired					169,431	206,127
Total					2,956,662	2,899,037
Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			1,298
Ending balance	1,358		1,358
Ending balance:
Total	1,358		1,298		1,358	1,298
Commercial real estate
Allowance for loan losses
Beginning balance	2,954	2,280	2,796	2,419
Charge-offs	(157)	0	(256)	(242)
Recoveries	7	1	12	5
Provision for loan losses	333	272	585	371
Ending balance	3,137	2,553	3,137	2,553
Ending balance:
Individually evaluated for impairment					183	158
Collectively evaluated for impairment					2,565	2,177
Total	2,954	2,280	2,796	2,419	3,137	2,796
Ending balance:
Individually evaluated for impairment					11,760	5,398
Collectively evaluated for impairment					1,319,303	1,227,597
Purchased credit-impaired					99,280	122,541
Total					1,430,343	1,355,536
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			461
Ending balance	389		389
Ending balance:
Total	389		461		389	461
Commercial and industrial
Allowance for loan losses
Beginning balance	1,336	782	1,274	805
Charge-offs	(602)	(205)	(971)	(446)
Recoveries	114	23	250	28
Provision for loan losses	1,112	278	1,407	491
Ending balance	1,960	878	1,960	878
Ending balance:
Individually evaluated for impairment					160	229
Collectively evaluated for impairment					1,776	952
Total	1,336	782	1,274	805	1,960	1,274
Ending balance:
Individually evaluated for impairment					3,105	2,343
Collectively evaluated for impairment					484,647	452,487
Purchased credit-impaired					15,448	14,018
Total					503,200	468,848
Commercial and industrial | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			93
Ending balance	24		24
Ending balance:
Total	24		93		24	93
Construction and development
Allowance for loan losses
Beginning balance	1,732	1,610	1,691	1,400
Charge-offs	(51)	0	(67)	(196)
Recoveries	5	2	10	2
Provision for loan losses	(1,021)	(219)	(969)	187
Ending balance	665	1,393	665	1,393
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					644	1,590
Total	1,732	1,610	1,691	1,400	665	1,691
Ending balance:
Individually evaluated for impairment					179	910
Collectively evaluated for impairment					300,586	337,540
Purchased credit-impaired					20,517	32,357
Total					321,282	370,807
Construction and development | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			101
Ending balance	21		21
Ending balance:
Total	21		101		21	101
Residential real estate
Allowance for loan losses
Beginning balance	1,251	1,726	1,237	1,673
Charge-offs	(120)	(11)	(130)	(207)
Recoveries	28	13	52	24
Provision for loan losses	168	58	168	296
Ending balance	1,327	1,786	1,327	1,786
Ending balance:
Individually evaluated for impairment					207	0
Collectively evaluated for impairment					345	681
Total	1,251	1,726	1,237	1,673	1,327	1,237
Ending balance:
Individually evaluated for impairment					3,112	928
Collectively evaluated for impairment					326,298	328,693
Purchased credit-impaired					28,206	30,628
Total					357,616	360,249
Residential real estate | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			556
Ending balance	775		775
Ending balance:
Total	775		556		775	556
Construction and development
Allowance for loan losses
Beginning balance	213	214	194	187
Charge-offs	0	0	0	0
Recoveries	0	0	27	0
Provision for loan losses	56	(33)	48	(6)
Ending balance	269	181	269	181
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					269	194
Total	213	214	194	187	269	194
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					30,884	28,436
Purchased credit-impaired					1,425	1,625
Total					32,309	30,061
Construction and development | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			0
Ending balance	0		0
Ending balance:
Total	0		0		0	0
Home equity
Allowance for loan losses
Beginning balance	706	503	546	476
Charge-offs	(183)	(83)	(318)	(271)
Recoveries	113	64	154	76
Provision for loan losses	139	77	393	280
Ending balance	775	561	775	561
Ending balance:
Individually evaluated for impairment					0	3
Collectively evaluated for impairment					685	456
Total	706	503	546	476	775	546
Ending balance:
Individually evaluated for impairment					20	406
Collectively evaluated for impairment					272,610	271,928
Purchased credit-impaired					4,057	4,328
Total					276,687	276,662
Home equity | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			87
Ending balance	90		90
Ending balance:
Total	90		87		90	87
Other consumer
Allowance for loan losses
Beginning balance	92	98	79	83
Charge-offs	(112)	(36)	(248)	(132)
Recoveries	38	6	71	13
Provision for loan losses	207	31	323	135
Ending balance	225	99	225	99
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					166	79
Total	92	$ 98	79	$ 83	225	79
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					34,727	36,244
Purchased credit-impaired					498	630
Total					35,225	36,874
Other consumer | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			0
Ending balance	59		59
Ending balance:
Total	$ 59		$ 0		$ 59	$ 0