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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Loans held for investment | $ 12,311,448 | $ 12,185,483
Unaccreted fair value net purchase discounts | 23,700 | 24,700
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |
Loans held for investment | 3,230,995 | 3,174,232
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Commercial loans secured by real estate [Member] |  |
Loans held for investment | $ 774,000 | $ 787,500

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