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Income Taxes - Additional Information (Detail) - USD ($)	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Retained earnings excluding deferred federal income tax liability	$ 2,217,000	$ 2,217,000
Amount deferred income tax liabilities expected to reverse into taxable income	$ 466,000	$ 466,000

X

- Definition

Amount deferred income tax liabilities expected to reverse into taxable income.

+ References

No definition available.

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X

- Definition

Retained earnings excluding deferred federal income tax liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	iroq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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