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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, 2020	Jun. 30, 2020	Sep. 30, 2019
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 525,033	$ 515,887	$ 496,903
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	520,620	510,504
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,239	3,633
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,174	1,506
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		244
One- to four-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	125,574	128,876	126,152
One- to four-family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	124,265	127,279
One- to four-family [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	724	775
One- to four-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	585	822
Multi-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	106,886	96,195	105,548
Multi-family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	106,617	95,925
Multi-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	269	270
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,147	8,551	8,897
Home equity lines of credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,147	8,402
Home equity lines of credit [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		134
Home equity lines of credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		15
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,050	22,042	17,267
Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,050	22,042
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	157,096	145,113	146,500
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	155,866	143,727
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	991	1,073
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	239	313
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	109,182	107,581	84,825
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,581	105,605
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,524	1,651
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	77	81
Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		244
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,098	7,529	$ 7,714
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,094	7,524
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 4	$ 5

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+ References

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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=121593590&loc=d3e4428-111522

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