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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Modifications, Recorded Investment $ 8,785us-gaap_FinancingReceivableModificationsRecordedInvestment $ 4,708us-gaap_FinancingReceivableModificationsRecordedInvestment
Non-accrual TDRs [Member]    
Financing Receivable, Modifications, Recorded Investment 1,635us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= fkys_NonaccrualTdrsMember		 1,638us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= fkys_NonaccrualTdrsMember
Accruing TDRs [Member]    
Financing Receivable, Modifications, Recorded Investment $ 7,150us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= fkys_AccruingTdrsMember		 $ 3,070us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= fkys_AccruingTdrsMember