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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

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- Definition Amount of unamortized loan commitment, origination, and other fees (costs) and purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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