Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Deferred Fees and Costs) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Deferred Fees and Costs) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net $ 6,148,918 $ 5,671,462 $ 5,543,621
Loans receivable, deferred fees and costs 3,300 3,000  
Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net 776,430 749,720 694,645
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net 857,142 860,086 863,578
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net 1,454,828 1,270,480 1,223,607
Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net 339,313 322,528 329,959
Commercial & Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net 509,857 435,365 409,657
Residential 1-4 Family      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net 999,361 978,469 987,788
Auto      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net 255,188 234,061 225,994
HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net 524,097 516,726 514,362
Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans held for investment, net $ 432,702 $ 304,027 $ 294,031