Name:	ktyb_BankServicingFeesNet
Namespace Prefix:	ktyb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The period for which the federal funds are sold generally by the entity.

No definition available.

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

Represents the increase or decrease related to qualitative factors in valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

No definition available.

Name:	ktyb_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityIncreaseDecrease
Namespace Prefix:	ktyb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment attributable to the recent historical actual net average.

No definition available.

Name:	ktyb_FinancingReceivableAllowanceForCreditLossesAttributableToRecentHistoricalActualNetAverage
Namespace Prefix:	ktyb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the period of historical loss experience used to determine general components of allowance for loan losses.

No definition available.

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

Represents the maximum number of days past due for loans to be charged off.

No definition available.

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

Represents the maximum number of days past due for loans to be charged off due to considerations other than past due.

No definition available.

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

Represents the minimum number of consecutive payments made on a timely basis before returning a loan to accrual status.

No definition available.

Name:	ktyb_FinancingReceivableMinimumNumberOfConsecutivePaymentsMadeOnTimelyBasisToReturnLoansToAccrualStatus
Namespace Prefix:	ktyb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of days delinquent for discontinuation of interest income on loans.

No definition available.

Name:	ktyb_FinancingReceivableNumberOfDaysDelinquentForDiscontinuationOfInterestIncome
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

Represents the amount of loans and leases receivable, net of partial charge-offs.

No definition available.

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

Represents the amount of partial charge-offs on loans and leases receivable.

No definition available.

Name:	ktyb_LoansAndLeasesReceivablePartialChargeOff
Namespace Prefix:	ktyb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

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

The valuation allowance for financing receivables acquired with deteriorated credit quality.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_AgriculturalLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_MultiFamilyResidentialMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_NonFarmAndNonResidentialMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ktyb_RealEstateConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CreditCardReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: