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Fair Values Schedule of Impaired Financing Receivables (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]      
Book Value Of Impaired Loans Carried At Fair Value $ 19,643prk_BookValueOfImpairedLoansCarriedAtFairValue $ 41,002prk_BookValueOfImpairedLoansCarriedAtFairValue  
Partial Charge-Offs On Impaired Loans carried at Fair Value 19,731prk_PartialChargeOffsOnImpairedLoansCarriedAtFairValue 48,952prk_PartialChargeOffsOnImpairedLoansCarriedAtFairValue  
Impaired Financing Receivable, Related Allowance 3,660us-gaap_ImpairedFinancingReceivableRelatedAllowance 10,451us-gaap_ImpairedFinancingReceivableRelatedAllowance  
Impaired loans carried at fair value 16,963prk_ImpairedLoanFairValue 33,819prk_ImpairedLoanFairValue  
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment 54,069prk_ImpairedFinancingReceivableloansnotheldatFairValueRecordedInvestment 71,313prk_ImpairedFinancingReceivableloansnotheldatFairValueRecordedInvestment  
Partial Charge-offs on Impaired Loans carried at Cost 12,749prk_PartialChargeoffsonImpairedLoanscarriedatCost 14,320prk_PartialChargeoffsonImpairedLoanscarriedatCost  
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount 53,089prk_ImpairedFinancingReceivableloansnotheldatFairValueCarryingAmount 68,045prk_ImpairedFinancingReceivableloansnotheldatFairValueCarryingAmount  
Recorded investment 73,712us-gaap_ImpairedFinancingReceivableRecordedInvestment 112,315us-gaap_ImpairedFinancingReceivableRecordedInvestment 137,339us-gaap_ImpairedFinancingReceivableRecordedInvestment
Partial charge-offs on impaired loans 32,480prk_PartialChargeOffsOnImpairedLoans 63,272prk_PartialChargeOffsOnImpairedLoans  
Individually evaluated for impairment 3,660us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 10,451us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1  
Impaired Financing Receivable, Carrying Value 70,052prk_ImpairedFinancingReceivableCarryingValue 101,864prk_ImpairedFinancingReceivableCarryingValue  
Financing Receivable, not collateral dependent [Domain]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Related Allowance 980us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByAssetClassAxis
= prk_FinancingReceivableNotCollateralDependentDomain		 3,268us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByAssetClassAxis
= prk_FinancingReceivableNotCollateralDependentDomain		  
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Related Allowance $ 2,680us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByAssetClassAxis
= prk_CommercialReceivablesExcludingCommercialFinancialAndAgriculturalDomain		 $ 7,183us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByAssetClassAxis
= prk_CommercialReceivablesExcludingCommercialFinancialAndAgriculturalDomain