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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss	$ 11,298,618	$ 11,060,658
Unaccreted fair value net purchase discounts	30,700	35,300
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable, before Allowance for Credit Loss	2,858,286	2,887,251
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Commercial loans secured by real estate [Member]
Financing Receivable, before Allowance for Credit Loss	$ 870,300	$ 952,100

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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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