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Regulatory Matters (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Preceding period of retained earnings used in calculation of dividend payable 2 years  
Dividends Payable, Amount Per Share $ 0.12us-gaap_DividendsPayableAmountPerShare $ 0.08us-gaap_DividendsPayableAmountPerShare
Pinnacle Financial [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Cash dividends paid to Pinnacle Financial by Pinnacle Bank $ 7,500,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Amount available for dividend distribution without prior approval from TDFI 103,800,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Actual Amount [Abstract]    
Total capital to risk weighted assets: 674,270,000us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to risk weighted assets: 606,657,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Common Equity Tier I Capital to risk weighted assets: 526,557,000pnfp_CommonEquityTierICapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to average assets: 606,657,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]  
Actual Ratio [Abstract]    
Total capital to risk weighted assets: (in hundredths) 12.10%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to risk weighted assets: (in hundredths) 10.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Common Equity Tier I Capital to Risk Weighted Assets (in hundredths) 9.40%pnfp_CommonEquityTierICapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to average assets: (in hundredths) 10.40%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]  
Regulatory Minimum Capital Requirement Amount [Abstract]    
Total capital to risk weighted assets: 447,311,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to risk weighted assets: 335,483,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Common Equity Tier I Risk Based Capital to risk weighted assets: 251,612,000pnfp_CommonEquityTierIRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to average assets: 232,438,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]  
Regulatory Minimum Capital Requirement Ratio [Abstract]    
Total capital to risk weighted assets: (in hundredths) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to risk weighted assets: (in hundredths) 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Common Equity Tier I capital to risk weighted assets: (in hundredths) 4.50%pnfp_CommonEquityTierIRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to average assets: (in hundredths) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]  
Regulatory Minimum To Be Well Capitalized Amount [Abstract]    
Total capital to risk weighted assets: 559,139,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to risk weighted assets: 447,311,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Common Equity Tier I capital to risk weighted assets: 363,440,000pnfp_CommonEquityTierIRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Regulatory Minimum To Be Well Capitalized Ratio [Abstract]    
Total capital to risk weighted assets: (in hundredths) 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Tier I capital to risk weighted assets: (in hundredths) 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Common Equity Tier I capital to risk weighted assets: (in hundredths) 6.50%pnfp_CommonEquityTierICapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Pinnacle Bank [Member]    
Actual Amount [Abstract]    
Total capital to risk weighted assets: 628,978,000us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to risk weighted assets: 561,365,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Common Equity Tier I Capital to risk weighted assets: 561,265,000pnfp_CommonEquityTierICapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to average assets: 561,365,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]  
Actual Ratio [Abstract]    
Total capital to risk weighted assets: (in hundredths) 11.30%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to risk weighted assets: (in hundredths) 10.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Common Equity Tier I Capital to Risk Weighted Assets (in hundredths) 10.10%pnfp_CommonEquityTierICapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to average assets: (in hundredths) 9.70%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]  
Regulatory Minimum Capital Requirement Amount [Abstract]    
Total capital to risk weighted assets: 446,242,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to risk weighted assets: 334,681,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Common Equity Tier I Risk Based Capital to risk weighted assets: 251,011,000pnfp_CommonEquityTierIRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to average assets: 230,969,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]  
Regulatory Minimum Capital Requirement Ratio [Abstract]    
Total capital to risk weighted assets: (in hundredths) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to risk weighted assets: (in hundredths) 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Common Equity Tier I capital to risk weighted assets: (in hundredths) 4.50%pnfp_CommonEquityTierIRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to average assets: (in hundredths) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]  
Regulatory Minimum To Be Well Capitalized Amount [Abstract]    
Total capital to risk weighted assets: 557,802,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to risk weighted assets: 446,242,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Common Equity Tier I capital to risk weighted assets: 362,571,000pnfp_CommonEquityTierIRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to average assets: $ 288,712,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]  
Regulatory Minimum To Be Well Capitalized Ratio [Abstract]    
Total capital to risk weighted assets: (in hundredths) 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to risk weighted assets: (in hundredths) 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Common Equity Tier I capital to risk weighted assets: (in hundredths) 6.50%pnfp_CommonEquityTierICapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Tier I capital to average assets: (in hundredths) 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]  
[1] Average assets for the above calculations were based on the most recent quarter.