Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Risks And Uncertainties [Abstract]
Unfunded loan commitments	$ 6,436,000	$ 5,486,000

Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.

No definition available.

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