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INVESTMENT SECURITIES (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Available-for-sale Securities Pledged as Collateral $ 213,671,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral   $ 222,847,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Held-to-maturity Securities Pledged as Collateral 1,051,000us-gaap_HeldToMaturitySecuritiesPledgedAsCollateral   1,056,000us-gaap_HeldToMaturitySecuritiesPledgedAsCollateral
Security Owned and Pledged as Collateral, Associated Liabilities, Fair Value 156,887,000us-gaap_SecurityOwnedAndPledgedAsCollateralAssociatedLiabilitiesFairValue   155,895,000us-gaap_SecurityOwnedAndPledgedAsCollateralAssociatedLiabilitiesFairValue
Proceeds from Sale of Available-for-sale Securities, Total 47,774,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 80,165,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Available-for-sale Securities, Gross Realized Gains 548,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 808,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Available-for-sale Securities, Gross Realized Losses $ 56,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses $ 211,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 30us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear    
State And Political Subdivisions On Tax Equivalent Basis Ratio Percentage 34.00%fkys_StateAndPoliticalSubdivisionsOnTaxEquivalentBasisRatioPercentage    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 22us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear