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Acquisitions - Narrative (Details) $ in Millions | Jun. 16, 2017 USD ($)
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BNC Bancorp |
Business Acquisition [Line Items] |
Transaction costs | $ 7.2

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=pnfp_BNCBancorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |