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, 2021
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs $ 14,272,280 $ 14,021,314
Total Allowance for credit losses (142,911) (160,540)
Total loans held for investment, net 14,129,369 13,860,774
Loans receivable, deferred fees and costs 83,800 69,700
Construction and Land Development    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 884,303 925,798
Commercial Real Estate - Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 2,083,155 2,128,909
Commercial Real Estate - Non-Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 3,671,471 3,657,562
Multifamily Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 842,906 814,745
Commercial and Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 3,599,884 3,263,460
Residential 1-4 Family - Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 658,051 671,949
Residential 1-4 Family - Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 816,916 822,866
Residential 1-4 Family - Revolving    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 563,786 596,996
Auto    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 406,349 401,324
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 215,711 247,730
Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 529,748 489,975
Paycheck Protection Program (PPP) | Commercial and Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 1,500,000 1,200,000
Paycheck Protection Program (PPP) | Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 20,200 $ 11,300