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Loans and Allowance for Loan Losses - Credit Risk Profile of Association's Loan Portfolio Based on Rating Category and Payment Activity (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 512,984	$ 520,526	$ 525,033
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	505,074	512,946
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,118	6,919
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	792	861
One- to four-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	117,854	117,435	125,574
One- to four-family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	116,337	116,980
One- to four-family [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,124
One- to four-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	393	455
Multi-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	97,211	104,433	106,886
Multi-family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	96,950	104,170
Multi-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	261	263
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,274	6,688	8,147
Home equity lines of credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,274	6,688
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	31,209	25,345	10,050
Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	31,209	25,345
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	163,859	155,884	157,096
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	162,821	154,833
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	943	954
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	95	97
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	88,962	103,088	109,182
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	83,868	97,078
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,051	5,964
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	43	46
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,615	7,653	$ 8,098
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 7,615	7,652
Consumer [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		$ 1

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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