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Other Real Estate Owned (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other Real Estate Owned (Textual) [Abstract]    
Total impairment charges $ 3,242rnst_OtherRealEstateCoveredImpairments $ 7,623rnst_OtherRealEstateCoveredImpairments
Consolidated Statements of Income    
Other Real Estate Owned (Textual) [Abstract]    
Total impairment charges 648rnst_OtherRealEstateCoveredImpairments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= rnst_StatementsOfIncomeMember		 1,525rnst_OtherRealEstateCoveredImpairments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= rnst_StatementsOfIncomeMember
FDIC loss-share indemnification asset    
Other Real Estate Owned (Textual) [Abstract]    
Total impairment charges $ 2,594rnst_OtherRealEstateCoveredImpairments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= rnst_FdicLossShareIndemnificationAssetMember		 $ 6,098rnst_OtherRealEstateCoveredImpairments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= rnst_FdicLossShareIndemnificationAssetMember