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Loans and the Allowance for Loan Losses (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Loan
Dec. 31, 2013
Loan
Restructured loans    
Number of Loans (loans) 53us-gaap_FinancingReceivableModificationsNumberOfContracts2 41us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-Modification Outstanding Recorded Investment $ 16,309us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 $ 32,358us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Outstanding Recorded Investment 14,337us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 21,478us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Commercial, financial, agricultural    
Restructured loans    
Number of Loans (loans) 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Pre-Modification Outstanding Recorded Investment 507us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
20us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Post-Modification Outstanding Recorded Investment 507us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
19us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Lease financing    
Restructured loans    
Number of Loans (loans) 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Pre-Modification Outstanding Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Post-Modification Outstanding Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Real estate – construction    
Restructured loans    
Number of Loans (loans) 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Pre-Modification Outstanding Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Post-Modification Outstanding Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Real estate – 1-4 family mortgage    
Restructured loans    
Number of Loans (loans) 35us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
23us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Pre-Modification Outstanding Recorded Investment 5,212us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
19,371us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Post-Modification Outstanding Recorded Investment 4,567us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
10,354us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Real estate – commercial mortgage    
Restructured loans    
Number of Loans (loans) 16us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
16us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Pre-Modification Outstanding Recorded Investment 10,590us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
12,785us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Post-Modification Outstanding Recorded Investment 9,263us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
10,934us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Installment loans to individuals    
Restructured loans    
Number of Loans (loans) 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
Pre-Modification Outstanding Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
182us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
Post-Modification Outstanding Recorded Investment $ 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
$ 171us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember