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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 9,805,723 $ 7,141,552 $ 6,554,046
Loans receivable, deferred fees and costs 2,700 1,300  
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,249,196 948,791 770,287
Commercial Real Estate - Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,279,155 943,933 870,559
Commercial Real Estate - Non-Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 2,230,463 1,713,659 1,631,767
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 547,520 357,079 353,769
Commercial & Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,125,733 612,023 576,567
Residential 1-4 Family - Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 714,660 612,395 580,568
Residential 1-4 Family - Mortgage      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 604,354 485,690 476,871
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 288,089 282,474 271,466
HELOC      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 642,084 537,521 $ 527,863
Consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 839,699 408,667  
Other Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 284,770 $ 239,320