Commitments - Schedule of Loan Commitments Representing Off-Balance Sheet Risk (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Commitments And Letters Of Credit [Line Items]
Commitments to extend credit	$ 28,204,000	$ 30,288,000
Stand-by letters of credit [Member]
Commitments And Letters Of Credit [Line Items]
Commitments to extend credit	$ 931,000	$ 725,000

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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