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Loans and Allowance for Loan Losses - Rollforward of Purchase Credit Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Gross Carrying Value |  |
Gross carrying value, beginning balance | $ 74,324 | $ 12,468
Acquisitions | 0 | 80,812
Year-to-date settlements | 31,487 | 18,956
Gross carrying value, ending balance | 42,837 | 74,324
Accretable Yield |  |
Accretable yield, beginning balance | (132) | 0
Acquisitions | 0 | (196)
Year-to-date settlements | 18 | 64
Accretable yield, ending balance | (114) | (132)
Nonaccretable Yield |  |
Nonaccretable yield, beginning balance | (31,537) | (3,633)
Acquisitions | 0 | (32,314)
Year-to-date settlements | 14,143 | 4,410
Nonaccretable yield, ending balance | (17,394) | (31,537)
Net Carrying Value |  |
Net carrying value, beginning balance | 42,655 | 8,835
Acquisitions | 0 | 48,302
Year-to-date settlements | (17,326) | (14,482)
Net carrying value, ending balance | $ 25,329 | $ 42,655

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
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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
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Namespace Prefix: | pnfp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Business Combination, Acquired Receivables, Fair Value [Roll Forward] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- 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

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- Definition Business Combination, Acquired Receivables, Gross Contractual Amount [Roll Forward] + References No definition available. + Details
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- 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
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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
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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
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- Definition Certain Loans Acquired in Transfer, Nonaccretable Difference [Roll Forward] + References No definition available. + Details
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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 + Details
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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 + Details
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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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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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Balance Type: | credit
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