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Fair Value Measurements - (Details 2) (Trust preferred securities, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis  
Fair Value $ 20,126us-gaap_EquityFairValueDisclosure
Valuation Technique Discounted cash flows
Significant Unobservable Inputs Default rate
Minimum
  
Significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis  
Range of Inputs (percent) 0.00%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rnst_TrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum
  
Significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis  
Range of Inputs (percent) 100.00%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rnst_TrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember