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Investment Securities (Narrative) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Schedule of Investments [Line Items] |  |
Investment Securities average remaining life | 4 years 8 months |
Available-for-sale Securities and Held-to-maturity Securities | 0 | 0
Other than Temporary Impairment Losses, Investments | $ 0 us-gaap_ImpairmentOfInvestments | $ 0 us-gaap_ImpairmentOfInvestments
Asset backed securities mortgage portfolio, term | 15 years |
U.S. Treasury And Sponsored Entities Callable Notes [Member] |  |
Schedule of Investments [Line Items] |  |
Available for Sale expected to be called | 100,600,000 prk_AvailableForSaleExpectedToBeCalled / us-gaap_InvestmentTypeAxis = prk_USTreasuryAndSponsoredEntitiesCallableNotesMember |
Available-for-sale securities | $ 495,200,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = prk_USTreasuryAndSponsoredEntitiesCallableNotesMember |
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Minimum [Member] |  |
Schedule of Investments [Line Items] |  |
Available for Sale Securities, Debt Maturities, Term | 5 years |
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Maximum [Member] |  |
Schedule of Investments [Line Items] |  |
Available for Sale Securities, Debt Maturities, Term | 8 years |

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- Definition Available for Sale Securities, Debt Maturities, Term + References No definition available. + Details
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- Definition Investments in Debt and Marketable Securities, Asset-backed Securities, Mortgage Portfolio Description, Mortgage Term + References No definition available. + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Disclosure of the basis (methodology and assumptions) on which cost was determined (for example, specific identification, average cost, or other allowed methods) in computing realized gain (loss) on securities sold which were categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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