Deposits - Additional Information (Detail) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Deposits Liabilities Disclosures [Abstract]
Brokered deposits Total	$ 225,000,000.0	$ 218,200,000
Aggregate amount of time certificates of deposit	44,908,000	$ 35,800,000
Aggregate amount of time certificates of deposit with a minimum denomination	$ 250,000

Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Name:	us-gaap_InterestBearingDomesticDepositBrokered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant