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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Financing Receivable, before Allowance for Credit Loss $ 11,140,582   $ 11,140,582   $ 11,777,289
Financing Receivable, Unamortized Loan Fee (Cost) and Purchase Premium (Discount) 37,600   37,600   48,000
Loans held for investment transferred to held for sale     32,858 $ 4,876  
Charge-offs (34,366) $ (14,355) (68,466) (46,599)  
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]          
Financing Receivable, before Allowance for Credit Loss 2,932,712   2,932,712   3,202,590
Charge-offs (167) $ (150) (1,036) $ (323)  
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | COVID-19 [Member] | US Government Insured Loan Program [Member]          
Financing Receivable, before Allowance for Credit Loss 218,400   218,400   406,000
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Commercial loans secured by real estate          
Financing Receivable, before Allowance for Credit Loss $ 970,000   $ 970,000   $ 1,000,000