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Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Amounts Of Off- Balance Sheet Financial Instruments With Credit Risk) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk [Abstract] |  |
Loan commitments | $ 809,140 | $ 716,598
Standby letters of credit | $ 18,772 | $ 24,462

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- Definition Loan commitments + References No definition available. + Details
Name: | prk_LoanCommitments
Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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