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Loans - Recorded Investment in Financing Receivable Modified as TDR Within 12 Month (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 contracts | Dec. 31, 2011 contracts
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 208 | 54
Recorded Investment | $ 8,879 | $ 32,462
Commercial, financial and agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 8 | 19
Recorded Investment | 244 | 3,878
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 10 | 5
Recorded Investment | 2,113 | 2,353
SEPH/Vision commercial land and development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 7 | 5
Recorded Investment | 970 | 3,406
Remaining commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 4 | 4
Recorded Investment | 1,476 | 1,277
Mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 1 | 1
Recorded Investment | 85 | 66
Installment |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 1 | 0
Recorded Investment | 27 |
Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 1 | 10
Recorded Investment | 16 | 20,195
Mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 39 | 7
Recorded Investment | 2,863 | 1,193
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 5 | 1
Recorded Investment | 70 | 50
Installment |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 9 | 2
Recorded Investment | 272 | 44
Leases |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 123 | 0
Recorded Investment | 743 |
Leases |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | $ 0 |

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- Definition Financing Receivable, Modifications, Subsequent Default, Number of Contracts, During Period + References No definition available. + Details
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Namespace Prefix: | prk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period + References No definition available. + Details
Name: | prk_FinancingReceivableModificationsSubsequentDefaultRecordedInvestmentDuringPeriod
Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration