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Loans and the Allowance for Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of loans    
Gross loans $ 3,988,187us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 3,881,019us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Unearned income (313)us-gaap_LoansAndLeasesReceivableDeferredIncome (1)us-gaap_LoansAndLeasesReceivableDeferredIncome
Loans, net of unearned income 3,987,874us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 3,881,018us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Allowance for loan losses (42,289)us-gaap_LoansAndLeasesReceivableAllowance (47,665)us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 3,945,585us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered 3,833,353us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
Commercial, financial, agricultural    
Summary of loans    
Gross loans 483,283us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
468,963us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ 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
Lease financing    
Summary of loans    
Gross loans 10,427us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
53us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Real estate – construction    
Summary of loans    
Gross loans 212,061us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
161,436us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ 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    
Summary of loans    
Gross loans 1,236,360us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
1,208,233us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ 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    
Summary of loans    
Gross loans 1,956,914us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
1,950,572us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ 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    
Summary of loans    
Gross loans 89,142us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
91,762us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ 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.