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Loans - Recorded Investment by Loan Grade (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Five Rated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans $ 16,252us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember		 $ 29,891us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember
Five Rated [Member] | Commercial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 1,874us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember		 6,055us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember
Five Rated [Member] | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 8,448us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember		 11,591us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember
Five Rated [Member] | SEPH commercial land and development    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans   354us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateSephCommercialLandAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember
Five Rated [Member] | Remaining commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 3,349us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember		 6,858us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember
Five Rated [Member] | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 2,581us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember		 5,033us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_FiveRatedMember
Six Rated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 3,568us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember		 2,698us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember
Six Rated [Member] | Commercial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 1,201us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember		 532us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember
Six Rated [Member] | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 1,712us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember		 1,525us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember
Six Rated [Member] | Remaining commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 57us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember		 244us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember
Six Rated [Member] | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 598us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember		 397us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_SixRatedMember
Impaired [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 73,729us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember		 111,529us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember
Impaired [Member] | Commercial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 19,123us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember		 20,740us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember
Impaired [Member] | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 21,989us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember		 41,822us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember
Impaired [Member] | SEPH commercial land and development    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 2,078us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_SephCommercialLandAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember		  
Impaired [Member] | SEPH commercial land and development    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans   4,777us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateSephCommercialLandAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember
Impaired [Member] | Remaining commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 5,609us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember		 10,782us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember
Impaired [Member] | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 24,930us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember		 33,408us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_ImpairedMember
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 2,378,859us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,329,102us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 837,555us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 801,184us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 1,041,034us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,061,100us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | SEPH commercial land and development    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 117us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_SephCommercialLandAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Pass [Member] | SEPH commercial land and development    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans   717us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateSephCommercialLandAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Remaining commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 106,424us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 93,221us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 390,541us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 369,453us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Leases    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 3,188us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceLeasesPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,427us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceLeasesPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Recorded Investment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 2,472,408us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember		 2,473,220us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember
Recorded Investment [Member] | Commercial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 859,753us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember		 828,511us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_CommercialFinancialAndAgriculturalMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember
Recorded Investment [Member] | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 1,073,183us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember		 1,116,038us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember
Recorded Investment [Member] | SEPH commercial land and development    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 2,195us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_SephCommercialLandAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember		  
Recorded Investment [Member] | SEPH commercial land and development    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans   5,848us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateSephCommercialLandAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember
Recorded Investment [Member] | Remaining commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 115,439us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember		 111,105us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ConstructionRealEstateRemainingCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember
Recorded Investment [Member] | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans 418,650us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember		 408,291us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= prk_ResidentialRealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember
Recorded Investment [Member] | Leases    
Financing Receivable, Recorded Investment [Line Items]    
Commercial loans $ 3,188us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceLeasesPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember		 $ 3,427us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceLeasesPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= prk_RecordedInvestmentMember