XML 69 R59.htm IDEA: XBRL DOCUMENT v3.20.2

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
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed and repossessed assets held for sale	$ (30)	$ 0
Non-recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (collateral-dependent)	$ 0	$ 2

X

- Definition

Foreclosed and repossessed assets held for sale losses on assets fair value disclosure.

+ References

No definition available.

+ Details

Name:	iroq_ForeclosedAndRepossessedAssetsHeldForSaleLossesOnAssetsFairValueDisclosure
Namespace Prefix:	iroq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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: