XML 72 R63.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Commitments - Additional Information (Detail) - USD ($) | Sep. 30, 2022 | Jul. 01, 2022 | Jun. 30, 2022
--- | --- | --- | ---
Commitments And Contingencies Disclosure [Line Items] |  |  |
Off-Balance-Sheet, Credit loss, Liability | $ 476,000 | $ 496,000 | $ 0

X
- References No definition available. + Details
Name: | iroq_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | iroq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant