Borrowings - Summary of Federal Home Loan Bank Advances (Detail) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank Advances [Line Items]
Total Federal Home Loan Bank advances	$ 50,000,000
Federal Home Loan Bank Line of Credit Advances [Member]
Federal Home Loan Bank Advances [Line Items]
Total Federal Home Loan Bank advances	$ 20,000,000	$ 0
Total Federal Home Loan Bank advances, Weighted Average Rate	0.47%
Federal Home Loan Bank Fixed Rate Term Advances [Member]
Federal Home Loan Bank Advances [Line Items]
Total Federal Home Loan Bank advances	$ 30,000,000
Total Federal Home Loan Bank advances, Weighted Average Rate	0.45%

Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64702-112823

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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