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Benefit Plans - Asset Allocation for the Pension Plan by Asset Category (Details)
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Actual Plan Asset Allocations 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Equity securities    
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Actual Plan Asset Allocations 85.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		 83.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
Fixed income and cash equivalents    
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Actual Plan Asset Allocations 15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= prk_FixedIncomeSecuritiesAndCashEquivalentsMember		 17.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= prk_FixedIncomeSecuritiesAndCashEquivalentsMember