Book Value Of Impaired Loans Carried At Fair Value

No definition available.

Name:	prk_BookValueOfImpairedLoansCarriedAtFairValue
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Discount Percentage Applied To Lot Development Appraised Values

+ References

No definition available.

+ Details

Name:	prk_DiscountPercentageAppliedToLotDevelopmentAppraisedValues
Namespace Prefix:	prk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Discount Percentage Applied To Real Estate Appraised Values

+ References

No definition available.

+ Details

Name:	prk_DiscountPercentageAppliedToRealEstateAppraisedValues
Namespace Prefix:	prk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Inputs, Accumulated Depreciation

+ References

No definition available.

+ Details

Name:	prk_FairValueInputsAccumulatedDepreciation
Namespace Prefix:	prk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Impaired Financing Receivable, related expense

+ References

No definition available.

+ Details

Name:	prk_ImpairedFinancingReceivableCarriedAtFairValueRelatedExpense
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Impaired Financing Receivable, Carrying Value

+ References

No definition available.

+ Details

Name:	prk_ImpairedFinancingReceivableCarryingValue
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Impaired Loan Fair Value

+ References

No definition available.

+ Details

Name:	prk_ImpairedLoanFairValue
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Mortgage Servicing Rights Fair Value

+ References

No definition available.

+ Details

Name:	prk_MortgageServicingRightsFairValue
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

OREO Devaluations

+ References

No definition available.

+ Details

Name:	prk_OreoDevaluations
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value

+ References

No definition available.

+ Details

Name:	prk_OtherRealEstateForeclosedAssetsAndRepossessedAssetsFairValue
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Partial Charge-Offs On Impaired Loans

+ References

No definition available.

+ Details

Name:	prk_PartialChargeOffsOnImpairedLoans
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Partial Charge-Offs On Impaired Loans carried at Fair Value

+ References

No definition available.

+ Details

Name:	prk_PartialChargeOffsOnImpairedLoansCarriedAtFairValue
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percent of OREO held at fair value

+ References

No definition available.

+ Details

Name:	prk_PercentofOREOheldatfairvalue
Namespace Prefix:	prk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Servicing Asset Recorded At Cost

+ References

No definition available.

+ Details

Name:	prk_ServicingAssetRecordedAtCost
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsComparabilityAdjustments
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_OtherRealEstateAndForeclosedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

+ Details

Name:	us-gaap_ServicingAssetAtAmortizedValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

+ Details

Name:	us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

New provisions recoveries or charged against this account which increase or reduce the net value of servicing assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (e)(2)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

+ Details

Name:	us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_FairValueByAssetClassAxis=prk_CommercialReceivablesExcludingCommercialFinancialAndAgriculturalDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=prk_FinancingReceivableNotCollateralDependentDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationTechniqueAxis=prk_BulkSaleApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationTechniqueAxis=prk_SalesComparisonApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_CostApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Fair Value (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
Fair Value (Narrative) (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 7,987,000		$ 5,264,000
Impaired Financing Receivable, Carrying Value	65,428,000		70,052,000
Discount percentage applied to real estate appraised values	15.00%
Discount percentage applied to lot development appraised values	6.00%
Partial Charge-Offs On Impaired Loans	25,792,000prk_PartialChargeOffsOnImpairedLoans		32,480,000prk_PartialChargeOffsOnImpairedLoans
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5,064,000		3,660,000
Impaired Financing Receivable, Related Allowance	5,064,000		3,660,000
Impaired loans carried at fair value	9,295,000prk_ImpairedLoanFairValue		16,963,000prk_ImpairedLoanFairValue
Partial Charge-Offs On Impaired Loans carried at Fair Value	13,228,000		19,731,000
Book Value Of Impaired Loans Carried At Fair Value	12,520,000		19,643,000
Impaired Financing Receivable, carried at fair value, related expense	1,000,000	2,200,000
MSR recorded at lower of cost or fair value	8,312,000us-gaap_ServicingAssetAtAmortizedValue	8,778,000us-gaap_ServicingAssetAtAmortizedValue	8,613,000us-gaap_ServicingAssetAtAmortizedValue	9,013,000us-gaap_ServicingAssetAtAmortizedValue
Mortgage Servicing Rights Fair Value	4,700,000prk_MortgageServicingRightsFairValue		2,900,000prk_MortgageServicingRightsFairValue
Valuation allowance of MSR	1,048,000	1,031,000	826,000	1,031,000
MSRs recorded at cost	3,600,000prk_ServicingAssetRecordedAtCost		5,700,000prk_ServicingAssetRecordedAtCost
Changes due to fair value adjustments	222,000	0
Other Real Estate, Foreclosed Assets, and Repossessed Assets	26,337,000		22,605,000
Percent of OREO held at fair value	37.56312%prk_PercentofOREOheldatfairvalue		45.61823%prk_PercentofOREOheldatfairvalue
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value	9,900,000		10,312,000
OREO valuation adjustments	304,000prk_OreoDevaluations	416,000prk_OreoDevaluations
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Financing Receivable, Related Allowance	3,225,000		2,680,000
Financing Receivable, not collateral dependent [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Financing Receivable, Related Allowance	1,839,000		980,000
Commercial Real Estate Portfolio Segment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	645,000		262,000
Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans carried at fair value			$ 8,481,000
Sales Comparison Approach Valuation Technique [Member] \| Maximum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	137.30%		84.00%
Sales Comparison Approach Valuation Technique [Member] \| Maximum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned, Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	51.20%		38.30%
Sales Comparison Approach Valuation Technique [Member] \| Weighted Average [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	25.80%		38.80%
Sales Comparison Approach Valuation Technique [Member] \| Weighted Average [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned, Residential [Member] \| Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	10.50%		10.10%
Sales Comparison Approach Valuation Technique [Member] \| Minimum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%		0.00%
Sales Comparison Approach Valuation Technique [Member] \| Minimum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned, Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%		0.00%
Cost Approach Valuation Technique [Member] \| Maximum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	50.00%		23.00%
Cost Approach Valuation Technique [Member] \| Maximum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned, Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	60.00%
Cost Approach Valuation Technique [Member] \| Weighted Average [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	37.60%		23.00%
Cost Approach Valuation Technique [Member] \| Weighted Average [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned, Residential [Member] \| Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	60.00%
Cost Approach Valuation Technique [Member] \| Minimum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	23.00%		23.00%
Cost Approach Valuation Technique [Member] \| Minimum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned, Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	60.00%
Bulk Sale Approach Valuation Technique [Member] \| Maximum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Discount Rate	8.00%
Bulk Sale Approach Valuation Technique [Member] \| Weighted Average [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Discount Rate	8.00%
Bulk Sale Approach Valuation Technique [Member] \| Minimum [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Discount Rate	8.00%