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, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 12,220,514 $ 9,716,207
Loans receivable, deferred fees and costs 7,200 5,100
Construction and Land Development    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,267,712 1,194,821
Commercial Real Estate - Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,966,776 1,337,345
Commercial Real Estate - Non-Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 3,104,823 2,467,410
Multifamily Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 602,115 548,231
Commercial & Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 2,032,799 1,317,135
Residential 1-4 Family - Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 801,703 713,750
Residential 1-4 Family - Mortgage    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 850,063 600,578
Auto    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 311,858 301,943
HELOC    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 660,621 613,383
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 383,653 379,694
Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 238,391 $ 241,917