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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
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