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Long-Term Debt (Details 1) (USD $)
12 Months Ended
Dec. 31, 2014
PHC Statutory Trust I  
Debentures details  
Principal Amount $ 20,619,000us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_DebtInstrumentAxis
= rnst_PhcStatutoryTrustOneMember
Interest Rate (percent) 3.09%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= rnst_PhcStatutoryTrustOneMember
Year of Maturity 2033
Amount Included in Tier 1 Capital 20,000,000us-gaap_TierOneLeverageCapital
/ us-gaap_DebtInstrumentAxis
= rnst_PhcStatutoryTrustOneMember
PHC Statutory Trust II  
Debentures details  
Principal Amount 31,959,000us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_DebtInstrumentAxis
= rnst_PhcStatutoryTrustTwoMember
Interest Rate (percent) 2.11%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= rnst_PhcStatutoryTrustTwoMember
Year of Maturity 2035
Amount Included in Tier 1 Capital 31,000,000us-gaap_TierOneLeverageCapital
/ us-gaap_DebtInstrumentAxis
= rnst_PhcStatutoryTrustTwoMember
Heritage Financial Statutory Trust I  
Debentures details  
Principal Amount 10,310,000us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_DebtInstrumentAxis
= rnst_HeritageFinancialStatutoryTrustOneMember
Interest Rate (percent) 10.20%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= rnst_HeritageFinancialStatutoryTrustOneMember
Year of Maturity 2031
Amount Included in Tier 1 Capital 10,000,000us-gaap_TierOneLeverageCapital
/ us-gaap_DebtInstrumentAxis
= rnst_HeritageFinancialStatutoryTrustOneMember
Capital Bancorp Capital Trust I  
Debentures details  
Principal Amount 12,372,000us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_DebtInstrumentAxis
= rnst_CapitalBancorpCapitalTrustOneMember
Interest Rate (percent) 1.76%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= rnst_CapitalBancorpCapitalTrustOneMember
Year of Maturity 2035
Amount Included in Tier 1 Capital 12,000,000us-gaap_TierOneLeverageCapital
/ us-gaap_DebtInstrumentAxis
= rnst_CapitalBancorpCapitalTrustOneMember
First M&F Statutory Trust I  
Debentures details  
Principal Amount 30,928,000us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_DebtInstrumentAxis
= rnst_FirstMFStatutoryTrustIMember
Interest Rate (percent) 1.57%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= rnst_FirstMFStatutoryTrustIMember
Year of Maturity 2036
Amount Included in Tier 1 Capital $ 18,359,000us-gaap_TierOneLeverageCapital
/ us-gaap_DebtInstrumentAxis
= rnst_FirstMFStatutoryTrustIMember