ALLOWANCE FOR CREDIT LOSSES ON LOANS AND FINANCE LEASES - Carrying Amount of Portfolios (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 11,060,658	$ 11,777,289
Commercial Portfolio Segment [Member] \| COVID-19 [Member] \| Small Business Administration [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 145,000	$ 406,000

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant