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Regulatory Matters - Reconciliation of Association Equity Amounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Association equity	$ 71,658	$ 85,304	$ 82,564
Association [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Association equity	63,797	80,472
Less net unrealized gains (losses)	(17,263)	2,361
Less postretirement benefit plan	(83)	(428)
Tier 1 capital	81,143	78,539
Plus allowance for loan losses subject to limit	7,052	6,599
Total risk-based capital	$ 88,195	$ 85,138

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Allowance for loan losses.

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Disallowed deferred tax assets.

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Net Unrealized Gains Losses

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- Definition

Amount of total capital as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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Amount of tangible capital as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
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