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Loans and the Allowance for Loan Losses (Details 11) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Sep. 01, 2013
Investment in loans, net of unearned income on impairment methodology      
Individually evaluated for impairment $ 48,649us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment $ 56,924us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment  
Collectively evaluated for impairment 3,594,800us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment 3,375,164us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment  
Acquired with deteriorated credit quality 344,425us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality 448,930us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality 899,236us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
Loans, net of unearned income 3,987,874us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 3,881,018us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome  
Commercial, financial, agricultural      
Investment in loans, net of unearned income on impairment methodology      
Individually evaluated for impairment 984us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
743us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
 
Collectively evaluated for impairment 458,895us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
432,736us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
 
Acquired with deteriorated credit quality 23,404us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
35,484us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
 
Loans, net of unearned income 483,283us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
468,963us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
 
Real estate – construction      
Investment in loans, net of unearned income on impairment methodology      
Individually evaluated for impairment 164us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Collectively evaluated for impairment 211,897us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
158,551us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Acquired with deteriorated credit quality 0us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
2,885us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Loans, net of unearned income 212,061us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
161,436us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Real estate – 1-4 family mortgage      
Investment in loans, net of unearned income on impairment methodology      
Individually evaluated for impairment 18,401us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
25,374us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
 
Collectively evaluated for impairment 1,135,140us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
1,080,297us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
 
Acquired with deteriorated credit quality 82,819us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
102,562us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
 
Loans, net of unearned income 1,236,360us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
1,208,233us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
 
Real estate – commercial mortgage      
Investment in loans, net of unearned income on impairment methodology      
Individually evaluated for impairment 29,079us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
30,624us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
 
Collectively evaluated for impairment 1,693,590us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
1,618,758us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
 
Acquired with deteriorated credit quality 234,245us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
301,190us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
 
Loans, net of unearned income 1,956,914us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
1,950,572us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
 
Installment loans to individuals      
Investment in loans, net of unearned income on impairment methodology      
Individually evaluated for impairment 21us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
183us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
 
Collectively evaluated for impairment 95,278us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
84,822us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
 
Acquired with deteriorated credit quality 3,957us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
6,809us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
 
Loans, net of unearned income $ 99,256us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
[1] $ 91,814us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
[1]  
[1] Includes lease financing receivables.