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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Loans held for investment | $ 11,950,932 | $ 11,552,825
Unaccreted fair value net purchase discounts | 25,800 | 29,300
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |
Loans held for investment | 3,030,954 | 2,886,263
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Commercial loans secured by real estate [Member] |  |
Loans held for investment | $ 807,600 | $ 838,500

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