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Short-Term Borrowings (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Short-term Debt [Line Items] |  |
Securities pledged to secure repurchase agreements | $ 669.0 | $ 668.0
Federal Home Loan Bank Advances [Member] |  |
Short-term Debt [Line Items] |  |
Commercial real estate and residential mortgage loans pledged under blanket agreement | $ 2,231.0 | $ 2,071.0

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- Definition Commercial real estate and residential mortgage loans pledged under blanket agreement. + References No definition available. + Details
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Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Securities pledged to secure repurchase agreements. + References No definition available. + Details
Name: | prk_SecuritiesPledgedToSecureRepurchaseAgreements
Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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