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Fair Value (Fair Value Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and money market instruments | $ 580,485 us-gaap_CashAndCashEquivalentsFairValueDisclosure | $ 237,699 us-gaap_CashAndCashEquivalentsFairValueDisclosure
Investment securities | 1,401,895 us-gaap_InvestmentOwnedAtFairValue | 1,445,405 us-gaap_InvestmentOwnedAtFairValue
Loans Held-for-sale, Fair Value Disclosure | 7,987 us-gaap_LoansHeldForSaleFairValueDisclosure | 5,264 us-gaap_LoansHeldForSaleFairValueDisclosure
Impaired loans carried at fair value | 9,295 prk_ImpairedLoanFairValue | 16,963 prk_ImpairedLoanFairValue
Other loans | 4,775,046 us-gaap_OtherAssetsFairValueDisclosure | 4,757,461 us-gaap_OtherAssetsFairValueDisclosure
Loans receivable, net | 4,792,517 us-gaap_LoansReceivableFairValueDisclosure | 4,779,758 us-gaap_LoansReceivableFairValueDisclosure
Noninterest bearing checking accounts | 1,262,442 prk_NoninterestBearingDepositLiabilitiesFairValue | 1,269,296 prk_NoninterestBearingDepositLiabilitiesFairValue
Interest bearing transactions accounts | 1,311,827 prk_InterestBearingDepositLiabilitiesFairValue | 1,122,079 prk_InterestBearingDepositLiabilitiesFairValue
Savings accounts | 1,558,128 prk_InterestBearingDomesticDepositSavingsFairValue | 1,325,445 prk_InterestBearingDomesticDepositSavingsFairValue
Time deposits | 1,392,772 prk_TimeDepositsFairValue | 1,422,885 prk_TimeDepositsFairValue
Other | 2,700 us-gaap_OtherLiabilitiesFairValueDisclosure | 1,269 us-gaap_OtherLiabilitiesFairValueDisclosure
Total deposits | 5,527,869 us-gaap_DepositsFairValueDisclosure | 5,140,974 us-gaap_DepositsFairValueDisclosure
Short-term borrowings | 239,961 prk_ShortTermBorrowingsFairValue | 276,980 prk_ShortTermBorrowingsFairValue
Long-term debt | 778,231 us-gaap_LongTermDebtFairValue | 827,500 us-gaap_LongTermDebtFairValue
Subordinated debentures/notes | 43,421 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations | 42,995 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
Fair Value Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Swap | 226 us-gaap_DerivativeLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SwapMember | 226 us-gaap_DerivativeLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SwapMember
Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest receivable | 4,313 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember | 4,048 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Loans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest receivable | 13,666 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_LoansReceivableMember | 13,629 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_LoansReceivableMember
Deposits [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest payable | 1,136 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember | 1,125 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember
Borrowings [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest payable | 1,452 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_BorrowingsMember | 1,426 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_BorrowingsMember
Reported Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and money market instruments | 580,485 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 237,699 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Investment securities | 1,398,860 us-gaap_InvestmentOwnedAtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,442,477 us-gaap_InvestmentOwnedAtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans Held-for-sale, Fair Value Disclosure | 7,987 us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 5,264 us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Derivative Assets | 189 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 70 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Impaired loans carried at fair value | 9,295 prk_ImpairedLoanFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 16,963 prk_ImpairedLoanFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Other loans | 4,757,951 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 4,753,033 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans receivable, net | 4,775,422 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 4,775,330 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Noninterest bearing checking accounts | 1,262,442 prk_NoninterestBearingDepositLiabilitiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,269,296 prk_NoninterestBearingDepositLiabilitiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Interest bearing transactions accounts | 1,311,827 prk_InterestBearingDepositLiabilitiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,122,079 prk_InterestBearingDepositLiabilitiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Savings accounts | 1,558,128 prk_InterestBearingDomesticDepositSavingsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,325,445 prk_InterestBearingDomesticDepositSavingsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Time deposits | 1,380,750 prk_TimeDepositsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,409,911 prk_TimeDepositsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Other | 2,700 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,269 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Total deposits | 5,515,847 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 5,128,000 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Short-term borrowings | 239,961 prk_ShortTermBorrowingsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 276,980 prk_ShortTermBorrowingsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Long-term debt | 733,555 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 786,602 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Subordinated debentures/notes | 45,000 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 45,000 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | Fair Value Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Swap | 226 us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SwapMember | 226 us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SwapMember
Reported Value Measurement [Member] | Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest receivable | 4,313 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 4,048 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | Loans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest receivable | 13,666 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 13,629 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | Deposits [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest payable | 1,136 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,125 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement [Member] | Borrowings [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest payable | 1,452 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_BorrowingsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,426 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_BorrowingsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and money market instruments | 580,485 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 237,699 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Investment securities | 1,891 us-gaap_InvestmentOwnedAtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 1,922 us-gaap_InvestmentOwnedAtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Derivative Assets | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Noninterest bearing checking accounts | 1,262,442 prk_NoninterestBearingDepositLiabilitiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 1,269,296 prk_NoninterestBearingDepositLiabilitiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Interest bearing transactions accounts | 1,311,827 prk_InterestBearingDepositLiabilitiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 1,122,079 prk_InterestBearingDepositLiabilitiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Savings accounts | 1,558,128 prk_InterestBearingDomesticDepositSavingsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 1,325,445 prk_InterestBearingDomesticDepositSavingsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Other | 2,700 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 1,269 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Total deposits | 4,135,097 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 3,718,089 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | Deposits [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest payable | 14 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 14 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | Borrowings [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest payable | 7 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_BorrowingsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member | 3 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_BorrowingsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel1Member
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 189 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 70 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Impaired loans carried at fair value |  | 16,963 prk_ImpairedLoanFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities | 1,399,265 us-gaap_InvestmentOwnedAtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 1,442,708 us-gaap_InvestmentOwnedAtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Loans Held-for-sale, Fair Value Disclosure | 7,987 us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 5,264 us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Derivative Assets | 189 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 70 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Loans receivable, net | 8,176 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 5,334 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Time deposits | 1,392,772 prk_TimeDepositsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 1,422,885 prk_TimeDepositsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Total deposits | 1,392,772 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 1,422,885 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Short-term borrowings | 239,961 prk_ShortTermBorrowingsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 276,980 prk_ShortTermBorrowingsFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Long-term debt | 778,231 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 827,500 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Subordinated debentures/notes | 43,421 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 42,995 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Level 2 [Member] | Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest receivable | 4,313 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 4,048 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Level 2 [Member] | Deposits [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest payable | 1,122 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 1,111 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Level 2 [Member] | Borrowings [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest payable | 1,445 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_BorrowingsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member | 1,423 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_BorrowingsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities | 739 us-gaap_InvestmentOwnedAtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member | 775 us-gaap_InvestmentOwnedAtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Derivative Assets | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Impaired loans carried at fair value | 9,295 prk_ImpairedLoanFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member | 16,963 prk_ImpairedLoanFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Other loans | 4,775,046 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member | 4,757,461 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Loans receivable, net | 4,784,341 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member | 4,774,424 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | Fair Value Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Swap | 226 us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SwapMember | 226 us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SwapMember
Fair Value, Inputs, Level 3 [Member] | Loans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Accrued interest receivable | $ 13,666 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member | $ 13,629 prk_AccruedInterestReceivableAtFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FairValueInputsLevel3Member

X
- Definition Accrued Interest Receivable At Fair Value + References No definition available. + Details
Name: | prk_AccruedInterestReceivableAtFairValue
Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

X
- Definition Interest Bearing Deposit Liabilities Fair Value + References No definition available. + Details
Name: | prk_InterestBearingDepositLiabilitiesFairValue
Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Interest Bearing Domestic Deposit Savings Fair Value + References No definition available. + Details
Name: | prk_InterestBearingDomesticDepositSavingsFairValue
Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Noninterest Bearing Deposit Liabilities Fair Value + References No definition available. + Details
Name: | prk_NoninterestBearingDepositLiabilitiesFairValue
Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Short Term Borrowings Fair Value + References No definition available. + Details
Name: | prk_ShortTermBorrowingsFairValue
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- Definition Time Deposits Fair Value + References No definition available. + Details
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- Definition Fair value portion of accrued expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt. + 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 (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph Column C -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column E -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611133-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611225-123010 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611322-123010 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611282-123010 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Article 12 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3, 4 -Article 12 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph 2, 3 -Article 12 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph 6 -Article 12 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 7 -Article 12 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column C -Article 12 + Details
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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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