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
Jun. 30, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 9,290,259 $ 7,141,552
Loans receivable, deferred fees and costs 2,600 1,300
Construction and Land Development    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,250,448 948,791
Commercial Real Estate - Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,293,791 943,933
Commercial Real Estate - Non-Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 2,318,589 1,713,659
Multifamily Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 541,730 357,079
Commercial & Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,093,771 612,023
Residential 1-4 Family - Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 723,945 612,395
Residential 1-4 Family - Mortgage    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 607,155 485,690
Auto    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 296,706 282,474
HELOC    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 626,916 537,521
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 298,021 408,667
Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 239,187 $ 239,320