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, 2020
Jan. 01, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs $ 14,021,314   $ 12,610,936
Total Allowance for credit losses (160,540) $ (94,838) (42,294)
Total loans held for investment, net 13,860,774   12,568,642
Loans receivable, deferred fees and costs 69,700   69,800
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 925,798   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 2,128,909   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 3,657,562   3,286,098
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 814,745   633,743
Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 3,263,460   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 671,949   724,337
Residential 1-4 Family - Consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 822,866   890,503
Residential 1-4 Family - Revolving      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 596,996   659,504
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 401,324   350,419
Consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 247,730   372,853
Other Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 489,975   $ 287,279
Paycheck Protection Program (PPP) | Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,200,000    
Paycheck Protection Program (PPP) | Other Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 11,300