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Investment Securities - Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]      
Other than Temporary Impairment Losses, Investments $ 0us-gaap_ImpairmentOfInvestments $ 17,000us-gaap_ImpairmentOfInvestments $ 54,000us-gaap_ImpairmentOfInvestments
Amortized cost of securities available-for-sale 1,299,980,000us-gaap_AvailableForSaleSecuritiesAmortizedCost 1,222,143,000us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Amortized cost of held-to-maturity securities 140,562,000us-gaap_HeldToMaturitySecurities 182,061,000us-gaap_HeldToMaturitySecurities  
Federal home loan bank stock 50,100,000us-gaap_FederalHomeLoanBankStock 59,000,000us-gaap_FederalHomeLoanBankStock  
Federal reserve bank stock 8,200,000us-gaap_FederalReserveBankStock 6,900,000us-gaap_FederalReserveBankStock  
Federal Home Loan Bank (FHLB) advance borrowings 1,205,000,000us-gaap_FederalHomeLoanBankAdvances 1,321,000,000us-gaap_FederalHomeLoanBankAdvances  
Money pledged for government and trust department deposits 513,000,000prk_MoneyPledgedForGovernmentAndTrustDepartmentDeposits 639,000,000prk_MoneyPledgedForGovernmentAndTrustDepartmentDeposits  
Money pledged to secure repurchase agreements 664,000,000prk_MoneyPledgedToSecureRepurchaseAgreements 648,000,000prk_MoneyPledgedToSecureRepurchaseAgreements  
Money pledged as collateral for FHLB advance borrowings 28,000,000prk_MoneyPledgedAsCollateralForFhlbAdvanceBorrowings 34,000,000prk_MoneyPledgedAsCollateralForFhlbAdvanceBorrowings  
Percentage of amount greater than shareholder's equity 10.00%prk_PercentageOfAmountGreaterThanShareholdersEquity    
Proceeds from sale of investment securities   75,000,000us-gaap_ProceedsFromSaleOfOtherInvestments  
Available-for-sale Securities, Gross Realized Gains 22,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains    
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments 1,200,000us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments 0us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments  
FHLB Shares repurchased 89,460prk_FHLBSharesrepurchased    
FHLB Stock amount repurchased 8,900,000prk_FHLBStockamountrepurchased    
FRB Stock shares purchased 27,000prk_FRBStocksharespurchased    
FRB amount stock purchased 1,400,000prk_FRBamountstockpurchased    
U.S. Treasury and sponsored entities callable notes      
Schedule of Investments [Line Items]      
Available-for-sale securities 546,900,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= prk_USTreasuryAndSponsoredEntitiesCallableNotesMember		    
Available for Sale expected to be called 30,000,000prk_AvailableForSaleExpectedToBeCalled
/ us-gaap_InvestmentTypeAxis
= prk_USTreasuryAndSponsoredEntitiesCallableNotesMember		    
Securities sold at a gain [Member]      
Schedule of Investments [Line Items]      
Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis (Methodology) of Securities Sold 187000    
Securities sold at a loss [Member]      
Schedule of Investments [Line Items]      
Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis (Methodology) of Securities Sold 174.1    
U.S. Government sponsored entity asset-backed securities      
Schedule of Investments [Line Items]      
Asset-backed securities mortgage portfolio, maturity term 15 years    
Amortized cost of securities available-for-sale 751,974,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 650,391,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Amortized cost of held-to-maturity securities 140,562,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 181,821,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Residential mortgage-backed securities      
Schedule of Investments [Line Items]      
Amortized cost of securities available-for-sale 387,100,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		    
Amortized cost of held-to-maturity securities 0us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		    
Collateralized mortgage-backed securities      
Schedule of Investments [Line Items]      
Amortized cost of securities available-for-sale 364,900,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember		    
Amortized cost of held-to-maturity securities 140,600,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember		    
U.S. Government sponsored entity mortgage-backed securities      
Schedule of Investments [Line Items]      
Proceeds from sale of investment securities     $ 0us-gaap_ProceedsFromSaleOfOtherInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= prk_USGovernmentSponsoredEntityMortgageBackedSecuritiesMember
Minimum | U.S. Treasury and sponsored entities callable notes      
Schedule of Investments [Line Items]      
Available for Sale Securities, Debt Maturities, Term. 5prk_AvailableforSaleSecuritiesDebtMaturitiesTerm.
/ us-gaap_InvestmentTypeAxis
= prk_USTreasuryAndSponsoredEntitiesCallableNotesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum | U.S. Treasury and sponsored entities callable notes      
Schedule of Investments [Line Items]      
Available for Sale Securities, Debt Maturities, Term. 8prk_AvailableforSaleSecuritiesDebtMaturitiesTerm.
/ us-gaap_InvestmentTypeAxis
= prk_USTreasuryAndSponsoredEntitiesCallableNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember