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Deposits (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Deposits (Textual)
Certificate of deposit accounts with balances equal to or in exceeding of $250,000 totaling	$ 9,800	$ 7,900
Deposits	$ 250

X

- Definition

Amount of deposit with bank.

+ References

No definition available.

+ Details

Name:	kffb_BankDeposits
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	kffb_DepositsTextualAbstract
Namespace Prefix:	kffb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

+ References

No definition available.

+ Details

Name:	kffb_TimeDeposits250000OrMore
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant