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Loans and the Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loan portfolio by risk-rating grades    
Total $ 2,074,363rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades $ 2,092,260rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
Commercial, financial, agricultural    
Loan portfolio by risk-rating grades    
Total 342,150rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 344,704rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Real estate – construction    
Loan portfolio by risk-rating grades    
Total 143,026rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 151,538rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Real estate – 1-4 family mortgage    
Loan portfolio by risk-rating grades    
Total 141,113rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember		 140,166rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Real estate – commercial mortgage    
Loan portfolio by risk-rating grades    
Total 1,447,450rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember		 1,454,450rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Installment loans to individuals    
Loan portfolio by risk-rating grades    
Total 624rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember		 1,402rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
Pass    
Loan portfolio by risk-rating grades    
Total 1,997,596rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,002,478rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Commercial, financial, agricultural    
Loan portfolio by risk-rating grades    
Total 333,160rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 337,998rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Real estate – construction    
Loan portfolio by risk-rating grades    
Total 142,470rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 150,683rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Real estate – 1-4 family mortgage    
Loan portfolio by risk-rating grades    
Total 124,635rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 122,608rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Real estate – commercial mortgage    
Loan portfolio by risk-rating grades    
Total 1,396,707rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,389,787rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Installment loans to individuals    
Loan portfolio by risk-rating grades    
Total 624rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,402rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Watch    
Loan portfolio by risk-rating grades    
Total 32,532rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 43,298rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Watch | Commercial, financial, agricultural    
Loan portfolio by risk-rating grades    
Total 6,731rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 5,255rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Watch | Real estate – construction    
Loan portfolio by risk-rating grades    
Total 556rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 855rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Watch | Real estate – 1-4 family mortgage    
Loan portfolio by risk-rating grades    
Total 3,497rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 6,079rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Watch | Real estate – commercial mortgage    
Loan portfolio by risk-rating grades    
Total 21,748rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 31,109rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Watch | Installment loans to individuals    
Loan portfolio by risk-rating grades    
Total 0rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 0rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Substandard    
Loan portfolio by risk-rating grades    
Total 44,235rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 46,484rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard | Commercial, financial, agricultural    
Loan portfolio by risk-rating grades    
Total 2,259rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 1,451rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard | Real estate – construction    
Loan portfolio by risk-rating grades    
Total 0rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 0rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard | Real estate – 1-4 family mortgage    
Loan portfolio by risk-rating grades    
Total 12,981rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 11,479rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard | Real estate – commercial mortgage    
Loan portfolio by risk-rating grades    
Total 28,995rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 33,554rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard | Installment loans to individuals    
Loan portfolio by risk-rating grades    
Total $ 0rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 $ 0rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember