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LOANS HELD FOR INVESTMENT - Additional Information I (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | $ 12,311,448 | $ 12,185,483
Asset Pledged as Collateral [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | 4,800,000 | 4,600,000
Asset Pledged as Collateral [Member] | Unisured Portion Of Government Deposits [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | 166,200 | 166,900
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Borrowings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | 1,800,000 | 1,800,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for investment | $ 2,700,000 | $ 2,500,000

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