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Investment in Qualified Affordable Housing (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Affordable Housing Program Assessments $ 1,700,000us-gaap_AffordableHousingProgramAssessments    
Affordable Housing Program Obligation 14,038,000us-gaap_AffordableHousingProgramObligation   16,629,000us-gaap_AffordableHousingProgramObligation
Affordable Housing Program Tax Credits 2,300,000prk_AffordableHousingProgramTaxCredits 2,200,000prk_AffordableHousingProgramTaxCredits  
Other Assets [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description     140803
Other Assets [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description     138746
Retained Earnings [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description     486541
Retained Earnings [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description     484484
Assets [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description     7003256
Assets [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description     7001199
Equity [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description     698598
Equity [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description     696541
Qualified Affordable Housing [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Equity Method Investments $ 47,184,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= prk_QualifiedAffordableHousingDomain
  48,911,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= prk_QualifiedAffordableHousingDomain
Other Income [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description   47698 195234
Other Income [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description   45779 187510
Income Tax Expense [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description   6036 28602
Income Tax Expense [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description   7997 36459
Net Income [Domain] | Scenario, Previously Reported [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description   19619 84090
Net Income [Domain] | Restatement Adjustment [Member] | Investment, Name [Domain]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Description   19577 83957