Shareholders' Equity - Components of Company's Regulatory Capital Requirements Under Banking Regulations (Detail) (Parenthetical)	Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stress capital buffer requirement	2.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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