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Loans and the Allowance for Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Summary of loans    
Gross loans $ 3,953,964us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 3,988,187us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Unearned income (303)us-gaap_LoansAndLeasesReceivableDeferredIncome (313)us-gaap_LoansAndLeasesReceivableDeferredIncome
Loans, net of unearned income 3,953,661us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 3,987,874us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Allowance for loan losses (42,302)us-gaap_LoansAndLeasesReceivableAllowance (42,289)us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 3,911,359us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered 3,945,585us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
Commercial, financial, agricultural    
Summary of loans    
Gross loans 474,788us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
483,283us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Loans, net of unearned income 474,788us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
483,283us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Lease financing    
Summary of loans    
Gross loans 11,863us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
10,427us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Real estate – construction    
Summary of loans    
Gross loans 201,449us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
212,061us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Loans, net of unearned income 201,449us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
212,061us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Real estate – 1-4 family mortgage    
Summary of loans    
Gross loans 1,239,455us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
1,236,360us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Loans, net of unearned income 1,239,455us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
1,236,360us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Real estate – commercial mortgage    
Summary of loans    
Gross loans 1,938,994us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
1,956,914us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Loans, net of unearned income 1,938,994us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
1,956,914us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Installment loans to individuals    
Summary of loans    
Gross loans 87,415us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
89,142us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
Loans, net of unearned income $ 98,975us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
[1] $ 99,256us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
[1]
[1] Includes lease financing receivables.