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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Loans held for investment | $ 11,719,315 | $ 11,552,825
Unaccreted fair value net purchase discounts | 27,100 | 29,300
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |
Loans held for investment | 2,946,201 | 2,886,263
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Commercial loans secured by real estate [Member] |  |
Loans held for investment | $ 821,400 | $ 838,500

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