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Derivative Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivatives designated as cash flow hedging instruments:      
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income      
Gains (losses) on derivative financial instruments $ 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 $ 203us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 $ 503us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Derivatives not designated as hedging instruments:      
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income      
Gains (losses) on derivative financial instruments 3,523us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 2,612us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 (899)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Included in interest income on loans | Derivatives designated as cash flow hedging instruments: | Interest rate swap      
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income      
Gains (losses) on derivative financial instruments 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember		 203us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember		 503us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
Included in interest income on loans | Derivatives not designated as hedging instruments: | Interest rate contracts      
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income      
Gains (losses) on derivative financial instruments 2,961us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember		 3,193us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember		 2,345us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
Included in other noninterest expense | Derivatives not designated as hedging instruments: | Interest rate contracts      
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income      
Gains (losses) on derivative financial instruments 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember		 69us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember		 (69)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember
Included in gains on sales of mortgage loans held for sale | Derivatives not designated as hedging instruments: | Interest rate lock commitments      
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income      
Gains (losses) on derivative financial instruments 1,171us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= rnst_GainsOnSalesOfMortgageLoansHeldForSaleMember		 (1,159)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= rnst_GainsOnSalesOfMortgageLoansHeldForSaleMember		 375us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= rnst_GainsOnSalesOfMortgageLoansHeldForSaleMember
Included in gains on sales of mortgage loans held for sale | Derivatives not designated as hedging instruments: | Forward commitments      
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income      
Gains (losses) on derivative financial instruments $ (609)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= rnst_GainsOnSalesOfMortgageLoansHeldForSaleMember		 $ 509us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= rnst_GainsOnSalesOfMortgageLoansHeldForSaleMember		 $ (3,550)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= rnst_GainsOnSalesOfMortgageLoansHeldForSaleMember