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Regulatory Update (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2011 | Dec. 31, 2010
Regulatory Update [Abstract] |  |
Guarantor support, total | $ 9.2 | $ 21.6
Guarantor support, exception taken | 9.0 | 18.0
Number of individual credit relationships incorporated into guarantor support analysis | 25 | 25
Guarantor support, offset by cash payments received | 3.3 |
Guarantor support, offset by increases in collateral values | 3.8 |
Guarantor support, offset by charge-offs or additional reserves | 5.3 |
Guarantor support, decline in value during the period | $ 12.4 |

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- Definition Guarantor Support, Decline In Value During The Period + Details
Name: | prk_GuarantorSupportDeclineInValueDuringPeriod
Namespace Prefix: | prk
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Guarantor Support Exception Taken + Details
Name: | prk_GuarantorSupportExceptionTaken
Namespace Prefix: | prk
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Guarantor Support Offset By Cash Payments Received + Details
Name: | prk_GuarantorSupportOffsetByCashPaymentsReceived
Namespace Prefix: | prk
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Guarantor Support Offset By Charge-Offs Or Additional Reserves + Details
Name: | prk_GuarantorSupportOffsetByChargeOffsOrAdditionalReserves
Namespace Prefix: | prk
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Guarantor Support Offset By Increases In Collateral Values + Details
Name: | prk_GuarantorSupportOffsetByIncreasesInCollateralValues
Namespace Prefix: | prk
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number Of Individual Credit Relationships + Details
Name: | prk_NumberOfIndividualCreditRelationships
Namespace Prefix: | prk
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

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- Definition Regulatory Update [Abstract] + Details
Name: | prk_RegulatoryUpdateAbstract
Namespace Prefix: | prk
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Total Guarantor Support + Details
Name: | prk_TotalGuarantorSupport
Namespace Prefix: | prk
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant