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LOANS HELD FOR INVESTMENT - Additional Information I (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | $ 13,048,684 | $ 12,746,556
Asset Pledged as Collateral [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | 5,700,000 | 5,400,000
Asset Pledged as Collateral [Member] | Time Deposits [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | 110,100 | 123,000
Asset Pledged as Collateral [Member] | Uninsured Portion Of Government Deposits [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | 127,000 | 163,500
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Borrowings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | 2,100,000 | 1,700,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | $ 3,400,000 | $ 3,400,000

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