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Share Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 259us-gaap_AllocatedShareBasedCompensationExpense $ 103us-gaap_AllocatedShareBasedCompensationExpense  
2013 Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 534,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 23,025us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
21,975us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
 
2014 Awards | Scenario, Forecast [Member] | 2013 Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense     1,100us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardDateAxis
= prk_A2014AwardsMember
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
2015 Awards | Scenario, Forecast [Member] | 2013 Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense     $ 1,800us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardDateAxis
= prk_A2015AwardsMemberMember
/ us-gaap_PlanNameAxis
= prk_A2013LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember