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, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 11,952,310 $ 9,716,207
Loans receivable, deferred fees and costs 5,800 5,100
Construction and Land Development    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,326,679 1,194,821
Commercial Real Estate - Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,921,464 1,337,345
Commercial Real Estate - Non-Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 2,970,453 2,467,410
Multifamily Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 591,431 548,231
Commercial & Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,866,625 1,317,135
Residential 1-4 Family - Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 815,309 713,750
Residential 1-4 Family - Mortgage    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 865,502 600,578
Auto    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 300,631 301,943
HELOC    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 672,087 613,383
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 397,491 379,694
Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 224,638 $ 241,917