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Share-Based Compensation - Narrative (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 458,000us-gaap_AllocatedShareBasedCompensationExpense $ 0us-gaap_AllocatedShareBasedCompensationExpense    
2005 Stock Incentive Option Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares authorized for delivery upon the exercise of incentive stock options   1,500,000prk_CommonSharesAuthorizedForDeliveryUponExerciseOfIncentiveStockOptions
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
   
2013 Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares authorized for delivery upon the exercise of incentive stock options 600,000prk_CommonSharesAuthorizedForDeliveryUponExerciseOfIncentiveStockOptions
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
     
Common shares available for future grants under the 2005 Plan 557,275us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecrease
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= prk_A2013LongTermIncentivePlanMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 21,975us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
     
Allocated Share-based Compensation Expense 801,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
850,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
   
Common Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Treasury Stock Reissued Shares For Director Grants 10,200prk_TreasuryStockReissuedSharesForDirectorGrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
10,550prk_TreasuryStockReissuedSharesForDirectorGrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
6,120prk_TreasuryStockReissuedSharesForDirectorGrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Allocated Share-based Compensation Expense 458,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Scenario, Forecast [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense       $ 1,200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember