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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Name:	us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Regulatory Restrictions - Additional Information (Detail) - USD ($)	Sep. 30, 2022	Sep. 30, 2021	Mar. 26, 2020
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Reserve funds deposit	$ 0	$ 0
Pandemic Impact [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Reserve funds deposit			$ 0