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
Sep. 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 $ 14,383,215   $ 12,610,936
Total Allowance for credit losses (174,122) $ (94,838) (42,294)
Total loans held for investment, net 14,209,093   12,568,642
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 1,207,190   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 2,107,333   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 3,497,929   3,286,098
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 731,582   633,743
Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 3,536,249   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 696,944   724,337
Residential 1-4 Family - Consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 830,144   890,503
Residential 1-4 Family - Revolving      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 618,320   659,504
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 387,417   350,419
Consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 276,023   372,853
Other Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 494,084   $ 287,279
Paycheck Protection Program (PPP)      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 769,600    
Paycheck Protection Program (PPP) | Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,600,000    
Paycheck Protection Program (PPP) | Other Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 21,300