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Variable Interest Entities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |
Proceeds from Issuance of Subordinated Long-term Debt | $ 133,000 |
Subordinated Debt | Trust Preferred Issuances |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 132,995 | $ 132,995
Other Assets | Low Income Housing Partnerships |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 143,190 | 100,885
Liability Recognized | 0 | 0
Loans | Commercial Troubled Debt Restructurings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 180 | 828
Liability Recognized | $ 0 | $ 0

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- Definition Balance sheet classification of the Variable Interest Entity's (VIE) liabilities included in the statement of financial position of the reporting entity. This element is applicable for variable interests whether the reporting entity has a controlling financial interest (primary beneficiary) or not. + References No definition available. + Details
Name: | pnfp_VariableInterestEntityClassificationOfCarryingAmountLiability
Namespace Prefix: | pnfp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=pnfp_VariableInterestEntityPrimaryBeneficiaryTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=pnfp_VariableInterestEntityPrimaryBeneficiaryThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |