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Loans Held for Sale Narrative (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Loans Held for Sale [Line Items]      
Disposal Group, Including Discontinued Operation, Mortgage Loans $ 5,264,000us-gaap_LoansHeldForSaleMortgages $ 1,666,000us-gaap_LoansHeldForSaleMortgages  
Loans Held-for-sale, Mortgages, Contractual Balance 5,200,000prk_LoansHeldForSaleMortgagesContractualBalance 1,600,000prk_LoansHeldForSaleMortgagesContractualBalance  
Expected Gain (Loss) on Sale of Mortgage Loans 80,000prk_ExpectedGainLossOnSaleOfMortgageLoans 28,000prk_ExpectedGainLossOnSaleOfMortgageLoans  
Commercial Portfolio Segment [Member]      
Loans Held for Sale [Line Items]      
Loans held for sale - lower of cost or market     22,000,000prk_Loansheldforsalelowerofcostormarket
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Gain (Loss) on Sale of Loans and Leases $ 1,900,000us-gaap_GainLossOnSaleOfLoansAndLeases
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember