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Loans and Allowance for Loan Losses - Rollforward of Purchase Credit Impaired Loans (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Gross Carrying Value
Gross carrying value, beginning balance	$ 74,324
Acquisition	0
Year-to-date settlements	(10,356)
Gross carrying value, ending balance	63,968
Accretable Yield
Accretable yield, beginning balance	(132)
Acquisition	0
Year-to-date settlements	16
Accretable yield, ending balance	(116)
Nonaccretable Yield
Nonaccretable yield, beginning balance	(31,537)
Acquisition	0
Year-to-date settlements	3,346
Nonaccretable yield, ending balance	(28,191)
Net Carrying Value
Net carrying value, beginning balance	42,655
Acquisition	0
Year-to-date settlements	(6,994)
Net carrying value, ending balance	$ 35,661

X

- Definition

The amount of additions due to acquisition to the aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

+ Details

Name:	pnfp_AcquiredAccretableYield
Namespace Prefix:	pnfp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of additions due to acquisition to the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

+ Details

Name:	pnfp_AcquiredNonaccretableYield
Namespace Prefix:	pnfp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

For receivables acquired in a business combination, the amount of acquisitions to the fair value of the receivables acquired.

+ References

No definition available.

+ Details

Name:	pnfp_BusinessCombinationAcquiredReceivablesFairValueAcquisitions
Namespace Prefix:	pnfp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Business Combination, Acquired Receivables, Fair Value [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	pnfp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For receivables acquired in a business combination, the amount of settlements to the fair value of the receivables acquired.

+ References

No definition available.

+ Details

Name:	pnfp_BusinessCombinationAcquiredReceivablesFairValueSettlements
Namespace Prefix:	pnfp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

For receivables acquired in a business combination, the amount of acquisitions to the gross contractual amounts receivable.

+ References

No definition available.

+ Details

Name:	pnfp_BusinessCombinationAcquiredReceivablesGrossContractualAcquisitions
Namespace Prefix:	pnfp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Business Combination, Acquired Receivables, Gross Contractual Amount [Roll Forward]

+ References

No definition available.

+ Details

Name:	pnfp_BusinessCombinationAcquiredReceivablesGrossContractualAmountRollForward
Namespace Prefix:	pnfp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For receivables acquired in a business combination, the amount of settlements to the gross contractual amounts receivable.

+ References

No definition available.

+ Details

Name:	pnfp_BusinessCombinationAcquiredReceivablesGrossContractualSettlements
Namespace Prefix:	pnfp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of settlements of the aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

+ Details

Name:	pnfp_CertainLoansAcquiredInTransferAccretableYieldSettlements
Namespace Prefix:	pnfp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of settlements of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

+ Details

Name:	pnfp_CertainLoansAcquiredInTransferNonaccretableDifferenceSettlements
Namespace Prefix:	pnfp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Certain Loans Acquired in Transfer, Accretable Yield [Roll Forward]

+ References

No definition available.

+ Details

Name:	pnfp_CertainLoansAcquiredinTransferAccretableYieldRollForward
Namespace Prefix:	pnfp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Certain Loans Acquired in Transfer, Nonaccretable Difference [Roll Forward]

+ References

No definition available.

+ Details

Name:	pnfp_CertainLoansAcquiredinTransferNonaccretableDifferenceRollForward
Namespace Prefix:	pnfp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant