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Disclosures about Fair Value of Assets - (Losses)/Recoveries Recognized on Assets Measured on Non-Recurring Basis (Detail) - Non-recurring [Member] - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans (collateral dependent) | $ 0 | $ 13
Foreclosed and repossessed assets held for sale | $ (9) | $ (19)

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- Definition Foreclosed and repossessed assets held for sale losses on assets fair value disclosure. + References No definition available. + Details
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- Definition Impaired loans gain losses recognized on assets fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | iroq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition 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. + References No definition available. + Details
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- Details
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