LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Loans stated at face amount, net of unearned income
Total loans held for investment, net	$ 5,780,502	[1]	$ 5,671,462	[1]	$ 5,387,755
Loans receivable, deferred fees and costs	3,600		3,000
Construction and Land Development [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	776,698		749,720		657,581
Commercial Real Estate - Owner Occupied [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	849,202		860,086		898,222
Commercial Real Estate - Non-Owner Occupied [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	1,296,251		1,270,480		1,180,464
Multifamily Real Estate [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	323,270		322,528		298,651
Commercial & Industrial [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	453,208		435,365		409,867
Residential 1-4 Family [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	978,478		978,469		970,928
Auto [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	241,737		234,061		211,293
HELOC [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	517,122		516,726		514,750
Consumer and all Other [Member]
Loans stated at face amount, net of unearned income
Total loans held for investment, net	$ 344,536		$ 304,027		$ 245,999

[1] Loans, as presented, are net of deferred fees and costs totaling $3.6 million and $3.0 million as of March 31, 2016 and December 31, 2015, respectively.