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BORROWINGS - Junior Subordinated Debentures and Loans Payable - Additional information (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Loans held for investment	$ 12,675,398	$ 12,746,556
Asset Pledged as Collateral [Member]
Debt Instrument [Line Items]
Loans held for investment	5,500,000	5,400,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member]
Debt Instrument [Line Items]
Loans held for investment	3,400,000	$ 3,400,000
Parent Company [Member] | Trust Preferred Securities [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Repurchased face amount	50,600
Parent Company [Member] | Statutory Trust Two [Member] | Trust Preferred Securities [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Repurchased face amount	$ 18,600

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