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, 2021
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs $ 13,697,929 $ 14,021,314
Total Allowance for credit losses (118,261) (160,540)
Total loans held for investment, net 13,579,668 13,860,774
Loans receivable, deferred fees and costs 73,700 69,700
Construction and Land Development    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 838,722 925,798
Commercial Real Estate - Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 2,069,658 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 3,712,607 3,657,562
Multifamily Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 860,081 814,745
Commercial and Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 2,990,622 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 637,485 671,949
Residential 1-4 Family - Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 823,355 822,866
Residential 1-4 Family - Revolving    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 559,014 596,996
Auto    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 411,073 401,324
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 195,036 247,730
Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net of deferred fees and costs 600,276 489,975
Paycheck Protection Program (PPP) | Commercial and Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net 842,000 1,200,000
Paycheck Protection Program (PPP) | Other Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Total loans held for investment, net $ 17,400 $ 11,300