Name:	ktyb_FinancingReceivableMaximumOutstandingBalanceOfNonConsumerLoansGradedSimilarToSpecifiedConsumerLoans
Namespace Prefix:	ktyb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the minimum period past due for loans to be considered as non-performing.

No definition available.

Name:	ktyb_FinancingReceivableMinimumPeriodPastDueForLoansToBeConsideredAsNonPerforming
Namespace Prefix:	ktyb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the amount over which loans are individually evaluated for impairment.

No definition available.

Name:	ktyb_FinancingReceivableOutstandingBalanceOverWhichLoansAreIndividuallyEvaluatedForImpairment
Namespace Prefix:	ktyb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
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Data Type:	na
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_RealEstateConstructionLoansMember
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_OneToFourFamilyResidentialMortgageLoansMember
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_MultiFamilyResidentialMortgageLoansMember
Namespace Prefix:
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_NonFarmAndNonResidentialMortgageLoansMember
Namespace Prefix:
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_AgriculturalLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
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Data Type:	na
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