Consolidated Condensed Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net Income	$ 19,044us-gaap_NetIncomeLoss	$ 19,577us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) loan losses	1,632us-gaap_ProvisionForLoanAndLeaseLosses	(2,225)us-gaap_ProvisionForLoanAndLeaseLosses
(Accretion)/amortization of investment securities, net	1,565	1,135
Depreciation	1,691	1,821
(Accretion)/amortization of investment securities, net	(63)	(49)
Amortization of long-term debt prepayment penalty	1,497	1,222
Loan originations to be sold in secondary market	(40,270)	(22,194)
Proceeds from sale of loans in secondary market	38,254prk_ProceedsFromLoanSales	20,802prk_ProceedsFromLoanSales
Gain on sale of commercial loans held for sale	(756)us-gaap_GainLossOnSalesOfLoansNet	0us-gaap_GainLossOnSalesOfLoansNet
Proceeds from commercial loans held for sale	900	0
Share-based compensation expense	259us-gaap_ShareBasedCompensation	103us-gaap_ShareBasedCompensation
Valuation adjustments	304prk_OtherRealEstateOwnedDevaluations	416prk_OtherRealEstateOwnedDevaluations
Gain on sale of OREO, net	(673)	(706)
Bank owned life insurance income	(1,878)us-gaap_BankOwnedLifeInsuranceIncome	(1,262)us-gaap_BankOwnedLifeInsuranceIncome
Changes in assets and liabilities:
Decrease in other assets	(8,403)	(2,665)
Increase (decrease) in other liabilities	(3,320)	(6,761)
Net cash provided by operating activities	9,076	8,762
Investing activities:
Proceeds from sales of Federal Home Loan Bank stock	0	8,946
Proceeds from maturity of:
Available-for-sale securities	78,523	21,581
Held-to-maturity securities	7,179	10,125
Purchases of:
Available-for-sale securities	(29,931)	(14,811)
Payments to Acquire Other Investments	0	(1,350)
Net loan originations, portfolio loans	(5,203)	(2,455)
Investments in qualified affordable housing projects	(2,591)	(8,000)
Proceeds from the sale of OREO	3,861	4,687
Life insurance death benefits	5,221	744
Purchases of premises and equipment, net	(3,401)	(2,123)
Net cash used in investing activities	53,658	17,344
Financing activities:
Net increase in deposits	387,847us-gaap_IncreaseDecreaseInDeposits	186,704us-gaap_IncreaseDecreaseInDeposits
Net (decrease) increase in short-term borrowings	(37,019)	9,865
Proceeds from issuance of long-term debt	25,000	25,000
Repurchase of treasury shares	(1,783)	(1,485)
Repayment of long-term debt	(79,544)us-gaap_RepaymentsOfLongTermDebt	(50,013)us-gaap_RepaymentsOfLongTermDebt
Cash dividends paid on common shares	(14,449)us-gaap_PaymentsOfOrdinaryDividends	(14,470)us-gaap_PaymentsOfOrdinaryDividends
Net cash provided by financing activities	280,052	155,601
Increase in cash and cash equivalents	342,786	181,707
Cash and cash equivalents at beginning of year	237,699	147,030
Cash and cash equivalents at end of period	580,485	328,737
Supplemental disclosures of cash flow information:
Cash paid for interest	9,446us-gaap_InterestPaidNet	9,858us-gaap_InterestPaidNet
Cash paid for income taxes	0us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid
Non cash activities:
Loans transferred to Other Real Estate Owned	7,270us-gaap_TransferOfOtherRealEstate	4,802us-gaap_TransferOfOtherRealEstate
Transfer of Portfolio Loans and Leases to Held-for-sale	132	0
Mortgage Loans on Real Estate [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of loans in secondary market	$ 707	$ 452

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Amount of cash inflow from the sale or maturity of long-term held-to-maturity securities.

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Amount of cash inflow from sale of Federal Reserve Bank (FRB) stock.

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The cash inflow resulting from the sale of loans (other than mortgage loans) that are held with the intention to resell in the near future.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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Amount of expense related to estimated loss from loan and lease transactions.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Value transferred out of real estate owned (REO) in noncash transactions.

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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