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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Financing Receivable, before Allowance for Credit Loss | $ 11,298,618 | $ 11,060,658
Unaccreted fair value net purchase discounts | 30,700 | 35,300
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |
Financing Receivable, before Allowance for Credit Loss | 2,858,286 | 2,887,251
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Commercial loans secured by real estate [Member] |  |
Financing Receivable, before Allowance for Credit Loss | $ 870,300 | $ 952,100

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