LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Allowance for loan losses
Beginning balance	$ 8,358	$ 7,451	$ 7,817	$ 7,043
Charge-offs	(1,531)	(782)	(3,521)	(2,276)
Recoveries	597	156	1,173	304
Provision for loan losses	1,576	816	3,531	2,570
Ending balance	9,000	7,641	9,000	7,641
Ending balance:
Individually evaluated for impairment					$ 537	$ 390
Collectively evaluated for impairment					7,065	6,129
Total	8,358	7,451	7,817	7,043	9,000	7,817
Ending balance:
Individually evaluated for impairment					21,109	9,985
Collectively evaluated for impairment					2,799,989	2,682,925
Purchased credit-impaired					159,661	206,127
Total					2,980,759	2,899,037
Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			1,298
Ending balance	1,398		1,398
Ending balance:
Total	1,398		1,298		1,398	1,298
Commercial real estate
Allowance for loan losses
Beginning balance	3,137	2,553	2,796	2,419
Charge-offs	(103)	(113)	(359)	(355)
Recoveries	44	13	56	18
Provision for loan losses	319	554	904	925
Ending balance	3,397	3,007	3,397	3,007
Ending balance:
Individually evaluated for impairment					209	158
Collectively evaluated for impairment					2,771	2,177
Total	3,137	2,553	2,796	2,419	3,397	2,796
Ending balance:
Individually evaluated for impairment					14,070	5,398
Collectively evaluated for impairment					1,319,836	1,227,597
Purchased credit-impaired					94,788	122,541
Total					1,428,694	1,355,536
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			461
Ending balance	417		417
Ending balance:
Total	417		461		417	461
Commercial and industrial
Allowance for loan losses
Beginning balance	1,960	878	1,274	805
Charge-offs	(406)	(170)	(1,377)	(616)
Recoveries	429	3	679	31
Provision for loan losses	185	188	1,592	679
Ending balance	2,168	899	2,168	899
Ending balance:
Individually evaluated for impairment					138	229
Collectively evaluated for impairment					2,009	952
Total	1,960	878	1,274	805	2,168	1,274
Ending balance:
Individually evaluated for impairment					3,120	2,343
Collectively evaluated for impairment					509,184	452,487
Purchased credit-impaired					14,354	14,018
Total					526,658	468,848
Commercial and industrial | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			93
Ending balance	21		21
Ending balance:
Total	21		93		21	93
Construction and development
Allowance for loan losses
Beginning balance	665	1,393	1,691	1,400
Charge-offs	(134)	(70)	(201)	(266)
Recoveries	10	67	20	69
Provision for loan losses	201	115	(768)	302
Ending balance	742	1,505	742	1,505
Ending balance:
Individually evaluated for impairment					58	0
Collectively evaluated for impairment					679	1,590
Total	665	1,393	1,691	1,400	742	1,691
Ending balance:
Individually evaluated for impairment					461	910
Collectively evaluated for impairment					298,963	337,540
Purchased credit-impaired					18,090	32,357
Total					317,514	370,807
Construction and development | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			101
Ending balance	5		5
Ending balance:
Total	5		101		5	101
Residential real estate
Allowance for loan losses
Beginning balance	1,327	1,786	1,237	1,673
Charge-offs	(312)	(251)	(442)	(458)
Recoveries	57	49	109	73
Provision for loan losses	232	(129)	400	167
Ending balance	1,304	1,455	1,304	1,455
Ending balance:
Individually evaluated for impairment					132	0
Collectively evaluated for impairment					637	681
Total	1,327	1,786	1,237	1,673	1,304	1,237
Ending balance:
Individually evaluated for impairment					3,439	928
Collectively evaluated for impairment					316,924	328,693
Purchased credit-impaired					26,902	30,628
Total					347,265	360,249
Residential real estate | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			556
Ending balance	535		535
Ending balance:
Total	535		556		535	556
Construction and development
Allowance for loan losses
Beginning balance	269	181	194	187
Charge-offs	0	0	0	0
Recoveries	0	0	27	0
Provision for loan losses	(15)	4	33	(2)
Ending balance	254	185	254	185
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					248	194
Total	269	181	194	187	254	194
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					48,894	28,436
Purchased credit-impaired					1,387	1,625
Total					50,281	30,061
Construction and development | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			0
Ending balance	6		6
Ending balance:
Total	6		0		6	0
Home equity
Allowance for loan losses
Beginning balance	775	561	546	476
Charge-offs	(475)	(100)	(793)	(371)
Recoveries	9	14	163	90
Provision for loan losses	593	25	986	305
Ending balance	902	500	902	500
Ending balance:
Individually evaluated for impairment					0	3
Collectively evaluated for impairment					555	456
Total	775	561	546	476	902	546
Ending balance:
Individually evaluated for impairment					19	406
Collectively evaluated for impairment					270,335	271,928
Purchased credit-impaired					3,797	4,328
Total					274,151	276,662
Home equity | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			87
Ending balance	347		347
Ending balance:
Total	347		87		347	87
Other consumer
Allowance for loan losses
Beginning balance	225	99	79	83
Charge-offs	(101)	(78)	(349)	(210)
Recoveries	48	10	119	23
Provision for loan losses	61	59	384	194
Ending balance	233	90	233	90
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					166	79
Total	225	$ 99	79	$ 83	233	79
Ending balance:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					35,853	36,244
Purchased credit-impaired					343	630
Total					36,196	36,874
Other consumer | Receivables Acquired with Deteriorated Credit Quality
Allowance for loan losses
Beginning balance			0
Ending balance	67		67
Ending balance:
Total	$ 67		$ 0		$ 67	$ 0