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
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs $ 14,308,646   $ 12,610,936
Total Allowance for credit losses (169,977) $ (94,838) (42,294)
Total loans held for investment, net 14,138,669   12,568,642
Loans, recorded investment under the Cares Act 14,138,669   12,568,642
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 1,247,939   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 2,067,087   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 3,455,125   3,286,098
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 717,719   633,743
Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 3,555,971   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 715,384   724,337
Residential 1-4 Family - Consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 841,051   890,503
Residential 1-4 Family - Revolving      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 627,765   659,504
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 380,053   350,419
Consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 311,362   372,853
Other Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 389,190   $ 287,279
Paycheck Protection Program (PPP)      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,600,000    
Loans, recorded investment under the Cares Act 1,600,000    
Paycheck Protection Program (PPP) | Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,600,000    
Loans, recorded investment under the Cares Act 1,600,000    
Paycheck Protection Program (PPP) | Other Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 20,300    
Loans, recorded investment under the Cares Act $ 20,300