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Fair Value (Reconciliation Of The Level 3 Input For Financial Instruments Measured On A Recurring Basis) (Details) (USD $) In Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Obligations Of States And Political Subdivisions [Member] |  |  |  |
Balance, beginning | $ 2,470 | $ 2,744 | $ 2,598 | $ 2,751
Total gains/(losses), Included in earnings - realized |  |  |  |
Total gains/(losses), Included in earnings - unrealized |  |  | (128) |
Total gains/(losses), Included in other comprehensive income |  | 12 |  | 5
Total gains/(losses), Purchases, sales, issuances and settlements, other, net | (2,470) |  | (2,470) |
Balance, ending | 0 | 2,756 | 0 | 2,756
Equity Securities [Member] |  |  |  |
Balance, beginning | 740 |  | 745 |
Total gains/(losses), Included in earnings - realized |  |  |  |
Total gains/(losses), Included in earnings - unrealized |  |  |  |
Total gains/(losses), Included in other comprehensive income | 1 |  | (4) |
Total gains/(losses), Purchases, sales, issuances and settlements, other, net |  |  |  |
Balance, ending | 741 |  | 741 |
Fair Value Swap [Member] |  |  |  |
Balance, beginning | (60) | (500) | (60) | (500)
Total gains/(losses), Included in earnings - realized |  |  |  |
Total gains/(losses), Included in earnings - unrealized |  |  |  |
Total gains/(losses), Included in other comprehensive income |  |  |  |
Total gains/(losses), Purchases, sales, issuances and settlements, other, net | (140) | 160 | (140) | 160
Balance, ending | $ (200) | $ (340) | $ (200) | $ (340)

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- Definition Fair Value Asset And Liabilities Measured On Recurring Basis Realized Gain Loss Included In Earnings + Details
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Namespace Prefix: | prk
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair Value Asset And Liabilities Measured On Recurring Basis Unrealized Gain Loss Included In Earnings + Details
Name: | prk_FairValueAssetAndLiabilitiesMeasuredOnRecurringBasisUnrealizedGainLossIncludedInEarnings
Namespace Prefix: | prk
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents total gains (losses) for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -SubTopic 10 -Topic 820 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInOtherComprehensiveIncomeLoss
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap
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Balance Type: | debit
Period Type: | instant