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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, 2019	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 496,397	$ 493,753	$ 500,301
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	490,471	488,010
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,802	2,415
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,124	3,318
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		10
One- to four-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	127,679	129,290	130,800
One- to four-family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	126,043	127,386
One- to four-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,636	1,904
Multi-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	102,756	104,663	108,391
Multi-family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	102,482	104,504
Multi-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	274	159
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,867	8,938	8,913
Home equity lines of credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,713	8,918
Home equity lines of credit [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	137
Home equity lines of credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17	20
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	18,749	16,113	12,447
Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	18,749	16,113
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	148,299	143,367	158,226
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	146,929	142,076
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,090	1,040
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	280	251
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	82,692	84,246	74,231
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	80,208	81,906
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,575	1,375
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	909	965
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,355	7,136	$ 7,293
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,347	7,107
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 8	19
Consumer [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		$ 10

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+ References

No definition available.

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- Definition

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=118952595&loc=d3e4428-111522

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