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Short-Term Borrowings - Narrative (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
FHLB Advances    
Short-term Debt [Line Items]    
Commercial real estate and residential mortgage loans pledged under blanket agreement $ 2,038prk_CommercialRealEstateAndResidentialMortgageLoansPledgedUnderBlanketAgreement
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 $ 2,072prk_CommercialRealEstateAndResidentialMortgageLoansPledgedUnderBlanketAgreement
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Repurchase agreements and Federal Funds Purchased    
Short-term Debt [Line Items]    
Securities pledged to secure repurchase agreements $ 664prk_SecuritiesPledgedToSecureRepurchaseAgreements
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember		 $ 648prk_SecuritiesPledgedToSecureRepurchaseAgreements
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember