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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment $ 13,048,684 $ 12,746,556
Unaccreted fair value net purchase discounts 21,200 23,600
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 3,614,241 3,366,038
Commercial Portfolio Segment [Member] | Commercial loans secured by real estate [Member] | Commercial and Industrial Sector [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment $ 873,700 $ 780,900