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Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Held-to-maturity Securities, Amortized Cost Basis [Abstract]    
Due within one year $ 10,307us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
Due after one year through five years 64,819us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Due after five years through ten years 219,684us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Due after ten years 135,353us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Held-to-maturity Securities, Fair Value [Abstract]    
Due within one year 10,394us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years 66,424us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years 221,924us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 143,746us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Due within one year 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through five years 1,063us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five years through ten years 5,056us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 26,400us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Available-for-sale Securities, Fair Value [Abstract]    
Due within one year 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years 1,126us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years 5,021us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 19,756us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Amortized Cost 430,163us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment 412,075us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Fair Value, Held to Maturity 442,488us-gaap_HeldToMaturitySecuritiesFairValue 408,576us-gaap_HeldToMaturitySecuritiesFairValue
Amortized Cost 553,770us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Fair Value 553,584us-gaap_AvailableForSaleSecurities 501,254us-gaap_AvailableForSaleSecurities
Other debt securities    
Available-for-sale Securities, Fair Value [Abstract]    
Amortized Cost 0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember		  
Fair Value, Held to Maturity 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember		  
Amortized Cost 17,517us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember		  
Fair Value 17,930us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember		 19,554us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Other equity securities    
Available-for-sale Securities, Fair Value [Abstract]    
Amortized Cost 0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		  
Fair Value, Held to Maturity 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		  
Amortized Cost 2,331us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		  
Fair Value 3,599us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 4,317us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Government agency mortgage backed securities | Residential mortgage backed securities:    
Available-for-sale Securities, Fair Value [Abstract]    
Amortized Cost 0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Fair Value, Held to Maturity 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Amortized Cost 292,283us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Fair Value 296,359us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 259,992us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Government agency mortgage backed securities | Commercial mortgage backed securities:    
Available-for-sale Securities, Fair Value [Abstract]    
Amortized Cost 0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Fair Value, Held to Maturity 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Amortized Cost 45,714us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Fair Value 47,185us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 42,041us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Government agency collateralized mortgage obligations | Residential mortgage backed securities:    
Available-for-sale Securities, Fair Value [Abstract]    
Amortized Cost 0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Fair Value, Held to Maturity 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Amortized Cost 158,436us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Fair Value 157,436us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 146,545us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:    
Available-for-sale Securities, Fair Value [Abstract]    
Amortized Cost 0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Fair Value, Held to Maturity 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Amortized Cost 4,970us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Fair Value $ 5,172us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 $ 5,066us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember