XML 61 R61.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Disclosures about Fair Value of Assets and Liabilities - (Losses)/Recoveries Recognized on Assets Measured on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Non-recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impaired loans (collateral-dependent) | $ 13 | $ (11) | $ 13 | $ (19)

X
- Definition Impaired loans gain losses recognized on assets fair value disclosure. + References No definition available. + Details
Name: | iroq_ImpairedLoansGainLossesRecognizedOnAssetsFairValueDisclosure
Namespace Prefix: | iroq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |