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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Long-term debt    
Long-term debt $ 156,422us-gaap_LongTermDebt $ 169,592us-gaap_LongTermDebt
Federal Home Loan Bank advances    
Long-term debt    
Long-term debt 61,611us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 75,405us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Other Long-Term Debt [Member]    
Long-term debt    
Long-term debt 237us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= rnst_OtherLongTermDebtMember		 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= rnst_OtherLongTermDebtMember
Junior subordinated debentures    
Long-term debt    
Long-term debt $ 94,574us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		 $ 94,187us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember