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Loans and the Allowance for Loan Losses (Details 7) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loan portfolio not subject to risk rating    
Loan portfolio $ 1,557,872rnst_LoanPortfolio $ 1,551,189rnst_LoanPortfolio
Commercial, financial, agricultural    
Loan portfolio not subject to risk rating    
Loan portfolio 111,981rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 115,175rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Lease financing    
Loan portfolio not subject to risk rating    
Loan portfolio 11,560rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember		 10,114rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Real estate – construction    
Loan portfolio not subject to risk rating    
Loan portfolio 58,423rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 60,523rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Real estate – 1-4 family mortgage    
Loan portfolio not subject to risk rating    
Loan portfolio 1,018,050rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember		 1,013,375rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Real estate – commercial mortgage    
Loan portfolio not subject to risk rating    
Loan portfolio 274,693rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember		 268,219rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Installment loans to individuals    
Loan portfolio not subject to risk rating    
Loan portfolio 83,165rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember		 83,783rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
Performing    
Loan portfolio not subject to risk rating    
Loan portfolio 1,554,558rnst_LoanPortfolio
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 1,546,689rnst_LoanPortfolio
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing | Commercial, financial, agricultural    
Loan portfolio not subject to risk rating    
Loan portfolio 111,612rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 114,996rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing | Lease financing    
Loan portfolio not subject to risk rating    
Loan portfolio 11,560rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 10,114rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing | Real estate – construction    
Loan portfolio not subject to risk rating    
Loan portfolio 58,220rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 60,323rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing | Real estate – 1-4 family mortgage    
Loan portfolio not subject to risk rating    
Loan portfolio 1,016,755rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 1,010,645rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing | Real estate – commercial mortgage    
Loan portfolio not subject to risk rating    
Loan portfolio 273,285rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 266,867rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing | Installment loans to individuals    
Loan portfolio not subject to risk rating    
Loan portfolio 83,126rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 83,744rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Non- Performing    
Loan portfolio not subject to risk rating    
Loan portfolio 3,314rnst_LoanPortfolio
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 4,500rnst_LoanPortfolio
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Non- Performing | Commercial, financial, agricultural    
Loan portfolio not subject to risk rating    
Loan portfolio 369rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 179rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Non- Performing | Lease financing    
Loan portfolio not subject to risk rating    
Loan portfolio 0rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 0rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Non- Performing | Real estate – construction    
Loan portfolio not subject to risk rating    
Loan portfolio 203rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 200rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Non- Performing | Real estate – 1-4 family mortgage    
Loan portfolio not subject to risk rating    
Loan portfolio 1,295rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 2,730rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Non- Performing | Real estate – commercial mortgage    
Loan portfolio not subject to risk rating    
Loan portfolio 1,408rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 1,352rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Non- Performing | Installment loans to individuals    
Loan portfolio not subject to risk rating    
Loan portfolio $ 39rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 $ 39rnst_LoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember