XML 35 R40.htm IDEA: XBRL DOCUMENT
v3.20.1

Earnings Per Share ("EPS") - Additional Information (Detail) - $ / shares |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 13, 2019 | Jun. 12, 2019
Shares authorized to be repurchased |  |  |  |  |  | 320,476 | 89,526
Percentage of current outstanding shares |  |  |  |  |  | 9.00% | 2.50%
Repurchase of stock during the period, shares |  | 22,795 | 35,356 | 337,876 | 290,356 |  |
Repurchase of shares in average price |  | $ 19.43 | $ 20.72 | $ 22.08 | $ 21.23 |  |
Stock Repurchase Plan [Member] | Third Repurchase Program [Member] |  |  |  |  |  |  |
Repurchase of stock during the period, shares | 20,200 |  |  |  |  |  |
Repurchase of shares in average price | $ 21.17 |  |  |  |  |  |
Stock Repurchase Plan [Member] | Four Repurchase Program [Member] |  |  |  |  |  |  |
Repurchase of shares in average price |  |  |  | $ 22.12 |  |  |

X
- Definition Stock repurchase program percentage of outstanding shares authorized to be repurchased. + References No definition available. + Details
Name: | iroq_StockRepurchaseProgramPercentageOfOutstandingSharesAuthorizedToBeRepurchased
Namespace Prefix: | iroq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Stock repurchased during period average cost per share. + References No definition available. + Details
Name: | iroq_StockRepurchasedDuringPeriodAverageCostPerShare
Namespace Prefix: | iroq_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=iroq_StockRepurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=iroq_ThirdRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=iroq_FourRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |