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Mortgage Loans Held For Sale (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mortgage Loans Held for Sale [Line Items]    
Mortgages Held-for-sale, Fair Value Disclosure $ 7,987,000us-gaap_MortgagesHeldForSaleFairValueDisclosure $ 5,264,000us-gaap_MortgagesHeldForSaleFairValueDisclosure
Disposal Group, Including Discontinued Operation, Mortgage Loans 7,900,000us-gaap_LoansHeldForSaleMortgages 5,200,000us-gaap_LoansHeldForSaleMortgages
Gain (Loss) on Sale of Mortgage Loans 122,000us-gaap_GainLossOnSaleOfMortgageLoans 80,000us-gaap_GainLossOnSaleOfMortgageLoans
Commercial Portfolio Segment [Member]    
Mortgage Loans Held for Sale [Line Items]    
Gain on sale of loans in secondary market 800,000us-gaap_GainLossOnSaleOfLoansAndLeases
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
 
Loans held for sale - lower of cost or market $ 100,000prk_Loansheldforsalelowerofcostormarket
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember