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STOCK BASED COMPENSATION (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock Based Compensation      
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Stock Option Plans      
Shares      
Outstanding, beginning of year (in shares) 19,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Forfeited or expired (in shares) (6,475)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Outstanding, end of period (in shares) 12,625us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Vested and expected to vest (in shares) 12,625us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Exercisable, end of period (in shares) 12,625us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Weighted Average Exercise Price      
Outstanding, beginning of year (in dollars per share) 31.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Forfeited or expired (in dollars per share) 33.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Outstanding, end of period (in dollars per share) 30.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Vested and expected to vest (in dollars per share) 30.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Exercisable, end of period (in dollars per share) 30.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember
   
Weighted Average Remaining Contractual Term      
Outstanding, end of period 4 years 10 months 24 days    
Vested and expected to vest 4 years 10 months 24 days    
Exercisable, end of period 4 years 10 months 24 days    
Additional disclosures      
Total unrecognized compensation cost related to nonvested stock options granted 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_PlanNameAxis
= ktyb_StockOptionPlansMember