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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | $ 12,870,002 | $ 12,746,556
Unaccreted fair value net purchase discounts | 22,100 | 23,600
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | 3,516,008 | 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 | $ 837,900 | $ 780,900

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