Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs $ 12,610,936 $ 9,716,207
Construction and Land Development    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 1,250,924 1,194,821
Commercial Real Estate - Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 2,041,243 1,337,345
Commercial Real Estate - Non-Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 3,286,098 2,467,410
Multifamily Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 633,743 548,231
Commercial and Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 2,114,033 1,317,135
Residential 1-4 Family - Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 724,337 640,419
Residential 1-4 Family - Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 890,503 673,909
Residential 1-4 Family - Revolving    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 659,504 613,383
Auto    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 350,419 301,943
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 372,853 379,694
Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs $ 287,279 $ 241,917