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Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Securities sold under agreements to repurchase and federal funds purchased	$ 276,980prk_SecuritiesSoldUnderAgreementsToRepurchaseAndFederalFundsPurchased	$ 242,029prk_SecuritiesSoldUnderAgreementsToRepurchaseAndFederalFundsPurchased
FHLB advances	0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
Total short-term borrowings	276,980us-gaap_ShortTermBorrowings	242,029us-gaap_ShortTermBorrowings
Repurchase agreements and Federal Funds Purchased
Short-term Debt [Line Items]
Total short-term borrowings	276,980us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	242,029us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Highest month-end balance	307,025us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	280,863us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Average daily balance	262,709prk_ShortTermDebtAverageDailyBalance / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	251,868prk_ShortTermDebtAverageDailyBalance / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Weighted-average interest rate:
As of year-end	0.18%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	0.19%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Paid during the year	0.19%prk_WeightedAverageInterestRatePaidDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	0.21%prk_WeightedAverageInterestRatePaidDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
FHLB Advances
Short-term Debt [Line Items]
Total short-term borrowings	0us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember	0us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Highest month-end balance	0us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember	0us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Average daily balance	$ 561prk_ShortTermDebtAverageDailyBalance / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember	$ 1,255prk_ShortTermDebtAverageDailyBalance / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Weighted-average interest rate:
As of year-end	0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember	0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Paid during the year	0.10%prk_WeightedAverageInterestRatePaidDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember	0.41%prk_WeightedAverageInterestRatePaidDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember

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- Definition

Securities sold under agreements to repurchase and federal funds purchased.

+ References

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Short-term Debt, Average Daily Balance

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Weighted-average interest rate: Paid during the year.

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- Definition

Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

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-Topic 942

-SubTopic 470

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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-Publisher SEC

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

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Weighted average interest rate of short-term debt outstanding.

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