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Commitments and Contingent Liabilities (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Loss Contingencies [Line Items]  
Inherent risks associated with off balance sheet commitments $ 1,371,168us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
Commitments to Extend Credit [Member]  
Loss Contingencies [Line Items]  
Amount of commitment 1,391,000,000us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Commitments to Extend Credit [Member] | Home equity [Member]  
Loss Contingencies [Line Items]  
Amount of commitment 213,500,000us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
/ pnfp_FinancialInstrumentClassificationAxis
= pnfp_CommitmentsToExtendCreditHomeEquityMember
Standby Letters of Credit [Member]  
Loss Contingencies [Line Items]  
Amount of commitment $ 66,000,000us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
Maximum [Member]  
Loss Contingencies [Line Items]  
Expiry period of standby letter of credit, maximum (in years) 2 years