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Loans and the Allowance for Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loan portfolio by risk-rating grades    
Total $ 2,092,260rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades $ 2,029,351rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
Pass    
Loan portfolio by risk-rating grades    
Total 2,002,478rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,908,662rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Watch    
Loan portfolio by risk-rating grades    
Total 43,298rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 57,932rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Substandard    
Loan portfolio by risk-rating grades    
Total 46,484rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 62,757rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial, financial, agricultural    
Loan portfolio by risk-rating grades    
Total 344,704rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 343,813rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial, financial, agricultural | Pass    
Loan portfolio by risk-rating grades    
Total 337,998rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 328,959rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial, financial, agricultural | Watch    
Loan portfolio by risk-rating grades    
Total 5,255rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 10,588rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Commercial, financial, agricultural | Substandard    
Loan portfolio by risk-rating grades    
Total 1,451rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 4,266rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Real estate – construction    
Loan portfolio by risk-rating grades    
Total 151,538rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 115,016rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Real estate – construction | Pass    
Loan portfolio by risk-rating grades    
Total 150,683rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 114,428rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Real estate – construction | Watch    
Loan portfolio by risk-rating grades    
Total 855rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 588rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Real estate – construction | Substandard    
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
Real estate – 1-4 family mortgage    
Loan portfolio by risk-rating grades    
Total 140,166rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember		 164,150rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Real estate – 1-4 family mortgage | Pass    
Loan portfolio by risk-rating grades    
Total 122,608rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 126,916rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Real estate – 1-4 family mortgage | Watch    
Loan portfolio by risk-rating grades    
Total 6,079rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 13,864rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Real estate – 1-4 family mortgage | Substandard    
Loan portfolio by risk-rating grades    
Total 11,479rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 23,370rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Real estate – commercial mortgage    
Loan portfolio by risk-rating grades    
Total 1,454,450rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember		 1,406,353rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Real estate – commercial mortgage | Pass    
Loan portfolio by risk-rating grades    
Total 1,389,787rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,338,340rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Real estate – commercial mortgage | Watch    
Loan portfolio by risk-rating grades    
Total 31,109rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember		 32,892rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= rnst_WatchMember
Real estate – commercial mortgage | Substandard    
Loan portfolio by risk-rating grades    
Total 33,554rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 35,121rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Installment loans to individuals    
Loan portfolio by risk-rating grades    
Total 1,402rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember		 19rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
Installment loans to individuals | Pass    
Loan portfolio by risk-rating grades    
Total 1,402rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 19rnst_LoansAndLeaseReceivableLoanPortfolioByRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Installment loans to individuals | Watch    
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
Installment loans to individuals | Substandard    
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