LOANS HELD FOR INVESTMENT - Additional Information I (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
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