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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss	$ 11,097,705	$ 11,060,658
Unaccreted fair value net purchase discounts	33,900	35,300
Commercial Portfolio Segment [Member] | COVID-19 [Member] | US Government Insured Loan Program [Member]
Financing Receivable, before Allowance for Credit Loss	89,700	145,000
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable, before Allowance for Credit Loss	2,880,256	2,887,251
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | COVID-19 [Member] | US Government Insured Loan Program [Member]
Financing Receivable, before Allowance for Credit Loss	$ 89,700	$ 145,000

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- Definition

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

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Amount, before allowance for credit loss, of financing receivable.

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