Quarterly report pursuant to Section 13 or 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
Mar. 31, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs $ 12,768,841 $ 12,610,936
Construction and Land Development    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 1,318,252 1,250,924
Commercial Real Estate - Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 2,051,904 2,041,243
Commercial Real Estate - Non-Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 3,328,012 3,286,098
Multifamily Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 679,390 633,743
Commercial and Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 2,177,932 2,114,033
Residential 1-4 Family - Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 721,800 724,337
Residential 1-4 Family - Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 854,550 890,503
Residential 1-4 Family - Revolving    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 652,135 659,504
Auto    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 358,039 350,419
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs 352,572 372,853
Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans held for investment, net of deferred fees and costs $ 274,255 $ 287,279