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Loans Receivable (Details) - Schedule of purchased credit impaired loans - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Dec. 31, 2021 | Jun. 30, 2021
Schedule of purchased credit impaired loans [Abstract] |  |
One- to four-family residential real estate | $ 434 | $ 595

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

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- Definition The cash outflow from the acquisition of residential property intended to generate income for the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration