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BORROWINGS - Junior Subordinated Debentures and Loans Payable - Additional information (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Loans held for investment	$ 12,746,556	$ 12,185,483
Asset Pledged as Collateral [Member]
Debt Instrument [Line Items]
Loans held for investment	5,400,000	4,600,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member]
Debt Instrument [Line Items]
Loans held for investment	3,400,000	$ 2,500,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member] | Borrower In Custody Of Collateral Program [Member]
Debt Instrument [Line Items]
Loans held for investment	2,600,000
Parent Company [Member] | Statutory Trust Two [Member] | Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Repurchased face amount	$ 100,000

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