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Note 10 - Regulatory Matters (Details) - Regulatory Ratios of the Consolidated Company and Its Subsidiary Banks
Mar. 31, 2015
Dec. 31, 2014
Consolidated [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital 14.48%ffkt_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_ConsolidatedMember		 [1]    [1]
Tier 1 Risk-based Capital 19.62%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_ConsolidatedMember		 [1] 19.75%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_ConsolidatedMember		 [1]
Total Risk-based Capital 20.75%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_ConsolidatedMember		 [1] 21.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_ConsolidatedMember		 [1]
Tier 1 Leverage 12.12%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_ConsolidatedMember		 [2] 12.04%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_ConsolidatedMember		 [2]
Farmers Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital 17.33%ffkt_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FarmersBankMember		 [1]    [1]
Tier 1 Risk-based Capital 17.33%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FarmersBankMember		 [1] 17.71%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FarmersBankMember		 [1]
Total Risk-based Capital 18.25%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FarmersBankMember		 [1] 18.70%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FarmersBankMember		 [1]
Tier 1 Leverage 9.48%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_FarmersBankMember		 [2] 9.40%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_FarmersBankMember		 [2]
United Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital 19.04%ffkt_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_UnitedBankMember		 [1]    [1]
Tier 1 Risk-based Capital 19.04%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_UnitedBankMember		 [1] 18.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_UnitedBankMember		 [1]
Total Risk-based Capital 20.29%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_UnitedBankMember		 [1] 19.26%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_UnitedBankMember		 [1]
Tier 1 Leverage 11.92%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_UnitedBankMember		 [2] 11.08%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_UnitedBankMember		 [2]
First Citizens Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital 14.61%ffkt_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FirstCitizensBankMember		 [1]    [1]
Tier 1 Risk-based Capital 14.61%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FirstCitizensBankMember		 [1] 13.66%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FirstCitizensBankMember		 [1]
Total Risk-based Capital 15.24%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FirstCitizensBankMember		 [1] 14.30%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_FirstCitizensBankMember		 [1]
Tier 1 Leverage 10.09%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_FirstCitizensBankMember		 [2] 9.44%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_FirstCitizensBankMember		 [2]
Citizens Northern [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital 14.14%ffkt_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_CitizensNorthernMember		 [1]    [1]
Tier 1 Risk-based Capital 14.14%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_CitizensNorthernMember		 [1] 14.46%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_CitizensNorthernMember		 [1]
Total Risk-based Capital 15.39%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_CitizensNorthernMember		 [1] 15.71%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ffkt_CitizensNorthernMember		 [1]
Tier 1 Leverage 9.72%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_CitizensNorthernMember		 [2] 10.11%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ffkt_CitizensNorthernMember		 [2]
[1] Common Equity Tier 1 Risked-based, Tier 1 Risk-based, and Total Risk-based Capital ratios are computed by dividing a bank's Common Equity Tier 1, Tier 1 or Total Capital, as defined by regulation, by a risk-weighted sum of the bank's assets, with the risk weighting determined by general standards established by regulation. The safest assets (e.g., government obligations) are assigned a weighting of 0% with riskier assets receiving higher ratings (e.g., ordinary commercial loans are assigned a weighting of 100%).
[2] Tier 1 Leverage ratio is computed by dividing a bank's Tier 1 Capital, as defined by regulation, by its total quarterly average assets.