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Note 6 - Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Note 6 - Investment Securities (Details) [Line Items]    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 1,872us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax $ 3,004us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available-for-sale Securities 649,038us-gaap_AvailableForSaleSecurities 626,388us-gaap_AvailableForSaleSecurities
Single Issuer Corporate Debt Security [Member]    
Note 6 - Investment Securities (Details) [Line Items]    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 523us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= ffkt_SingleIssuerCorporateDebtSecurityMember		 354us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= ffkt_SingleIssuerCorporateDebtSecurityMember
Available-for-sale Securities $ 5,400us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= ffkt_SingleIssuerCorporateDebtSecurityMember