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Deposits - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Deposits [Abstract] |  |
Deposits received from executive officers, directors, and their related interests | $ 21.6 | $ 21.9
Time Deposits, $250,000 or more | $ 49.7 | $ 64.7

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- Definition Time Deposits, $250,000 or more + References No definition available. + Details
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Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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