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Subsequent Events (Details)	3 Months Ended
	Sep. 30, 2017 USD ($)
Subsequent Events (Textual)
Cash value of the policies pertaining to Mr. Garland	$ 792,000
Bank receiving insurance policies maintained for director amount	1,200,000
Recognize income of amount	$ 370,000

X

- Definition

Bank receiving insurance policies maintained amount.

+ References

No definition available.

+ Details

Name:	kffb_BankReceivingInsurancePoliciesMaintainedAmount
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Recognize income of amount.

+ References

No definition available.

+ Details

Name:	kffb_RecognizeIncomeOfAmount
Namespace Prefix:	kffb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The net cash outflow or inflow for net proceeds and payments derived from carrying life insurance policies for which the entity is the beneficiary.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration