LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Including Purchased Impaired Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	$ 5,941,098	$ 5,671,462	$ 5,510,385
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	765,997	749,720	671,234
Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	831,880	860,086	874,582
Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	1,370,745	1,270,480	1,217,646
Multifamily Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	337,723	322,528	316,474
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	469,054	435,365	426,193
Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	992,457	978,469	991,592
HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	519,196	516,726	512,123
Consumer and all other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	409,471	304,027	284,121
Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	67,170	73,737	87,841
Purchased Impaired [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	21,986	22,339
Purchased Impaired [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	32,386	33,862
Purchased Impaired [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	11,507	15,760
Purchased Impaired [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	1,291	1,776
Purchased Impaired [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	5,013	5,986	8,397
Purchased Impaired [Member] | Construction and Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	1,071	2,059
Purchased Impaired [Member] | Construction and Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	2,432	1,778
Purchased Impaired [Member] | Construction and Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	1,269	1,908
Purchased Impaired [Member] | Construction and Land Development [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	241	241
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	20,692	27,388	29,838
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	5,407	5,260
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	9,813	15,530
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	5,472	6,598
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	0	0
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	18,297	13,519	16,982
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	5,335	4,442
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	12,400	7,827
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	562	1,250
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	0	0
Purchased Impaired [Member] | Multifamily Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	2,092	1,555	3,004
Purchased Impaired [Member] | Multifamily Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	350	356
Purchased Impaired [Member] | Multifamily Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	1,742	1,199
Purchased Impaired [Member] | Multifamily Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	0	0
Purchased Impaired [Member] | Multifamily Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	0	0
Purchased Impaired [Member] | Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	1,354	1,813	2,940
Purchased Impaired [Member] | Commercial & Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	104	144
Purchased Impaired [Member] | Commercial & Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	434	359
Purchased Impaired [Member] | Commercial & Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	816	1,289
Purchased Impaired [Member] | Commercial & Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	0	21
Purchased Impaired [Member] | Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	17,805	21,159	24,157
Purchased Impaired [Member] | Residential 1-4 Family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	8,677	9,098
Purchased Impaired [Member] | Residential 1-4 Family [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	5,224	6,380
Purchased Impaired [Member] | Residential 1-4 Family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	3,285	4,605
Purchased Impaired [Member] | Residential 1-4 Family [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	619	1,076
Purchased Impaired [Member] | HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	1,517	1,791	1,840
Purchased Impaired [Member] | HELOC [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	861	923
Purchased Impaired [Member] | HELOC [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	146	410
Purchased Impaired [Member] | HELOC [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	79	20
Purchased Impaired [Member] | HELOC [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	431	438
Purchased Impaired [Member] | Consumer and all other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	400	526	$ 683
Purchased Impaired [Member] | Consumer and all other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	181	57
Purchased Impaired [Member] | Consumer and all other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	195	379
Purchased Impaired [Member] | Consumer and all other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	24	90
Purchased Impaired [Member] | Consumer and all other [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment, net of deferred fees and costs	$ 0	$ 0