LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Deferred Fees and Costs) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	$ 5,941,098	$ 5,671,462	$ 5,510,385
Loans receivable, deferred fees and costs	1,900	3,000
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	765,997	749,720	671,234
Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	831,880	860,086	874,582
Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	1,370,745	1,270,480	1,217,646
Multifamily Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	337,723	322,528	316,474
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	469,054	435,365	426,193
Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	992,457	978,469	991,592
Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	244,575	234,061	216,420
HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	519,196	516,726	512,123
Consumer and all other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans held for investment, net	$ 409,471	$ 304,027	$ 284,121