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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	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 513,298	$ 515,887	$ 496,397
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	509,746	510,504
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,448	3,633
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,104	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	123,493	128,876	127,679
One- to four-family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	122,964	127,279
One- to four-family [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		775
One- to four-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	529	822
Multi-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	105,836	96,195	102,756
Multi-family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	105,569	95,925
Multi-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	267	270
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,858	8,551	8,867
Home equity lines of credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,858	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	13,870	22,042	18,749
Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,870	22,042
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	152,448	145,113	148,299
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	151,232	143,727
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	979	1,073
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	237	313
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	101,528	107,581	82,692
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	99,991	105,605
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,469	1,651
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	68	81
Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		244
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,265	7,529	$ 7,355
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,262	7,524
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 3	$ 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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