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, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 9,411,598 $ 7,141,552
Loans receivable, deferred fees and costs 3,500 1,300
Construction and Land Development    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,178,054 948,791
Commercial Real Estate - Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,283,125 943,933
Commercial Real Estate - Non-Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 2,427,251 1,713,659
Multifamily Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 542,662 357,079
Commercial & Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,154,583 612,023
Residential 1-4 Family - Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 719,798 612,395
Residential 1-4 Family - Mortgage    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 611,728 485,690
Auto    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 306,196 282,474
HELOC    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 612,116 537,521
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 345,320 408,667
Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 230,765 $ 239,320