Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs $ 5,671,462 $ 5,345,996 $ 3,039,368
Commercial [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 4,148,118 3,824,483 2,163,705
Consumer [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 1,523,344 1,521,513 $ 875,663
Construction Loans [Member] | Commercial [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 484,768 341,280  
Construction Loans [Member] | Consumer [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 49,359 74,168  
Commercial Real Estate - Owner Occupied [Member] | Commercial [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 860,086 875,443  
Commercial Real Estate - Non-Owner Occupied [Member] | Commercial [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 1,618,605 1,509,159  
Raw Land and Lots [Member] | Commercial [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 195,665 211,225  
Single Family Investment Real Estate [Member] | Commercial [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 429,489 412,494  
Commercial and Industrial [Member] | Commercial [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 467,613 393,776  
Other Commercial [Member] | Commercial [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 91,892 81,106  
Mortgage [Member] | Consumer [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 474,034 478,151  
Indirect Auto [Member] | Consumer [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 225,815 199,411  
Indirect Marine [Member] | Consumer [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 43,717 43,190  
HELOCs [Member] | Consumer [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs 494,192 500,579  
Credit Card [Member] | Consumer [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] | Consumer [Member]      
Loans stated at face amount, net of unearned income      
Loans held for investment, net of deferred fees and costs $ 236,227 $ 201,789