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Loan Servicing (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Transfers and Servicing of Financial Assets [Abstract] |  |  |  |  |
Serviced sold mortgage loans | $ 0 | $ 1,380,000 | $ 0 | $ 1,380,000 | $ 1,390,000
Serviced sold mortgage loans with recourse | 2,400 | 2,600 | 2,400 | 2,600 | $ 2,500
Servicing fees included in other service income | 900 | $ 0 | 1,800 | $ 0 |
Mortgage Loans Sold with Recourse, Reserve | $ 27 |  | $ 27 |  |

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- Definition Mortgage Loans Sold with Recourse, Reserve + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Principal Amount Outstanding On Sold Loans Servicing Retained + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Principal Amount Outstanding On Sold Loans Servicing Retained With Recourse + 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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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration