LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	$ 5,543,621	$ 5,345,996	$ 5,171,003
Commercial Construction [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	429,645	341,280
Commercial Real Estate - Owner Occupied [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	863,551	875,443
Commercial Real Estate - Non-Owner Occupied [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	1,586,334	1,509,159
Raw Land and Lots [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	187,182	211,225
Single Family Investment Real Estate [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	436,340	412,494
Commercial and Industrial [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	444,199	393,776
Other Commercial [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	89,344	81,106
Mortgage [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	466,418	478,151
Consumer Construction [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	55,718	74,168
Indirect Auto [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	217,928	199,411
Indirect Marine [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	42,763	43,190
HELOCs [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	492,202	500,579
Credit Card [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs		24,225
Other Consumer [Member]
Loans stated at face amount, net of unearned income
Loans held for investment, net of deferred fees and costs	$ 231,997	$ 201,789