LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Deferred Fees and Costs) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	$ 6,771,490	$ 6,307,060	$ 5,941,098
Loans receivable, deferred fees and costs	898	1,800
Construction and Land Development
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	799,938	751,131	765,997
Commercial Real Estate - Owner Occupied
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	888,285	857,805	831,880
Commercial Real Estate - Non-Owner Occupied
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	1,698,329	1,564,295	1,370,745
Multifamily Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	367,257	334,276	337,723
Commercial & Industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	568,602	551,526	469,054
Residential 1-4 Family
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	1,066,519	1,029,547	992,457
Auto
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	274,162	262,071	244,575
HELOC
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	535,088	526,884	519,196
Consumer and all other
Loans and Leases Receivable Disclosure [Line Items]
Total loans held for investment, net	$ 573,310	$ 429,525	$ 409,471