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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Available-for-Sale Securities    
Amortized Cost $ 341,020us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 353,679us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains 8,455us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 6,392us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross Unrealized Losses (1,809)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss (6,373)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Fair Value 347,666us-gaap_AvailableForSaleSecurities 353,698us-gaap_AvailableForSaleSecurities
Held-to-Maturity Securities    
Amortized Cost 1,056us-gaap_HeldToMaturitySecurities 1,072us-gaap_HeldToMaturitySecurities
Gross Unrealized Gains 4us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains 11us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
Investment securities held-to-maturity, estimated fair value 1,060us-gaap_HeldToMaturitySecuritiesFairValue 1,083us-gaap_HeldToMaturitySecuritiesFairValue
US Treasury securities [Member]    
Available-for-Sale Securities    
Amortized Cost 11,356us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
0us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Gross Unrealized Gains 24us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Gross Unrealized Losses (2)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Fair Value 11,378us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Obligations of U.S. Government Corporations and Agencies Mortgage-backed [Member]    
Available-for-Sale Securities    
Amortized Cost 112,146us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
122,661us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
Gross Unrealized Gains 1,055us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
598us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
Gross Unrealized Losses (487)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
(2,035)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
Fair Value 112,714us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
121,224us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
Held-to-Maturity Securities    
Amortized Cost 56us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
72us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
Gross Unrealized Gains 2us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
3us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
Investment securities held-to-maturity, estimated fair value 58us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
75us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfUsGovernmentCorporationsAndAgenciesMortgagebackedMember
Other Obligations of U.S. Government Corporations and Agencies [Member]    
Available-for-Sale Securities    
Amortized Cost 26,246us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
32,107us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Gains 270us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
238us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Losses (6)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
(60)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value 26,510us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
32,285us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held-to-Maturity Securities    
Amortized Cost 1,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
1,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Gains 2us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
8us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Investment securities held-to-maturity, estimated fair value 1,002us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
1,008us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Obligations of State and Political Subdivisions [Member]    
Available-for-Sale Securities    
Amortized Cost 151,565us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfStateAndPoliticalSubdivisionsMember
147,112us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfStateAndPoliticalSubdivisionsMember
Gross Unrealized Gains 6,127us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfStateAndPoliticalSubdivisionsMember
4,136us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfStateAndPoliticalSubdivisionsMember
Gross Unrealized Losses (469)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfStateAndPoliticalSubdivisionsMember
(2,859)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfStateAndPoliticalSubdivisionsMember
Fair Value 157,223us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfStateAndPoliticalSubdivisionsMember
148,389us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fkys_ObligationsOfStateAndPoliticalSubdivisionsMember
Corporate debt securities [Member]    
Available-for-Sale Securities    
Amortized Cost 38,499us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
50,266us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains 112us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
416us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Losses (825)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(1,417)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Fair Value 37,786us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
49,265us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Marketable equity securities [Member]    
Available-for-Sale Securities    
Amortized Cost 1,208us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
1,533us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Gross Unrealized Gains 867us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
1,004us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Gross Unrealized Losses (20)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(2)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Fair Value $ 2,055us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
$ 2,535us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember