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Fair Value Fair Value (Impaired Financing Receivables Additional Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Book Value Of Impaired Loans Carried At Fair Value | $ 12,520 prk_BookValueOfImpairedLoansCarriedAtFairValue | $ 19,643 prk_BookValueOfImpairedLoansCarriedAtFairValue |
Partial Charge-Offs On Impaired Loans carried at Fair Value | 13,228 prk_PartialChargeOffsOnImpairedLoansCarriedAtFairValue | 19,731 prk_PartialChargeOffsOnImpairedLoansCarriedAtFairValue |
Impaired Financing Receivable, Related Allowance | 5,064 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 3,660 us-gaap_ImpairedFinancingReceivableRelatedAllowance |
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount | 56,133 prk_ImpairedFinancingReceivableloansnotheldatFairValueCarryingAmount | 53,089 prk_ImpairedFinancingReceivableloansnotheldatFairValueCarryingAmount |
Impaired Financing Receivable, Recorded Investment | 70,492 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 73,712 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 105,873 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired loans carried at fair value | 9,295 prk_ImpairedLoanFairValue | 16,963 prk_ImpairedLoanFairValue |
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment | 57,972 prk_ImpairedFinancingReceivableloansnotheldatFairValueRecordedInvestment | 54,069 prk_ImpairedFinancingReceivableloansnotheldatFairValueRecordedInvestment |
Partial Charge-offs on Impaired Loans carried at Cost | 12,564 prk_PartialChargeoffsonImpairedLoanscarriedatCost | 12,749 prk_PartialChargeoffsonImpairedLoanscarriedatCost |
Impaired Financing Receivable, Carrying Value | 65,428 prk_ImpairedFinancingReceivableCarryingValue | 70,052 prk_ImpairedFinancingReceivableCarryingValue |
Partial Charge-Offs On Impaired Loans | 25,792 prk_PartialChargeOffsOnImpairedLoans | 32,480 prk_PartialChargeOffsOnImpairedLoans |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 5,064 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 | 3,660 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 |
Financing Receivable, not collateral dependent [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | 1,839 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FairValueByAssetClassAxis = prk_FinancingReceivableNotCollateralDependentDomain | 980 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FairValueByAssetClassAxis = prk_FinancingReceivableNotCollateralDependentDomain |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | $ 3,225 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FairValueByAssetClassAxis = prk_CommercialReceivablesExcludingCommercialFinancialAndAgriculturalDomain | $ 2,680 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FairValueByAssetClassAxis = prk_CommercialReceivablesExcludingCommercialFinancialAndAgriculturalDomain |

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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