Sale Of Vision Bank Business - Schedule of Composition of Pre-tax Gain on Sale of Business (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Premium paid			$ 27,913prk_PremiumPaidOnBusiness
One-time gains			298prk_OneTimeGainsOnDisposalOfBusiness
Loss on sale of fixed assets			(2,434)us-gaap_GainLossOnDispositionOfAssets
Employment and severance agreements			(1,610)us-gaap_SeveranceCosts1
Other one-time charges, including estimates			(2,000)us-gaap_BusinessExitCosts1
Pre-tax gain	$ 0us-gaap_GainLossOnSaleOfBusiness	$ 0us-gaap_GainLossOnSaleOfBusiness	$ 22,167us-gaap_GainLossOnSaleOfBusiness

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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