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Capital Ratios - Capital Ratios for Park and Each Subsidiary (Details)
Dec. 31, 2014
Dec. 31, 2013
Park National Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Risk-Based Capital 10.13%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= prk_ParkNationalBankMember		 10.01%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= prk_ParkNationalBankMember
Total Risk-Based 11.74%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= prk_ParkNationalBankMember		 11.78%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= prk_ParkNationalBankMember
Leverage 6.96%prk_LeverageCapitalToAverageTotalAssets
/ dei_LegalEntityAxis
= prk_ParkNationalBankMember		 7.10%prk_LeverageCapitalToAverageTotalAssets
/ dei_LegalEntityAxis
= prk_ParkNationalBankMember
Park    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Risk-Based Capital 13.39%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= prk_ParkMember		 13.27%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= prk_ParkMember
Total Risk-Based 15.14%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= prk_ParkMember		 15.91%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= prk_ParkMember
Leverage 9.25%prk_LeverageCapitalToAverageTotalAssets
/ dei_LegalEntityAxis
= prk_ParkMember		 9.48%prk_LeverageCapitalToAverageTotalAssets
/ dei_LegalEntityAxis
= prk_ParkMember