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Derivative Instruments-Balance Sheet Location - (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Offsetting Derivative Assets    
Gross amounts recognized $ 44us-gaap_DerivativeFairValueOfDerivativeAsset $ 5us-gaap_DerivativeFairValueOfDerivativeAsset
Gross amounts offset in the consolidated balance sheets 0us-gaap_DerivativeAssetFairValueGrossLiability 0us-gaap_DerivativeAssetFairValueGrossLiability
Net amounts presented in the consolidated balance sheets 44us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 5us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Financial instruments 44rnst_DerivativeFairValueLiabilitiesNotOffset 5rnst_DerivativeFairValueLiabilitiesNotOffset
Financial collateral pledged 0us-gaap_DerivativeCollateralObligationToReturnCash 0us-gaap_DerivativeCollateralObligationToReturnCash
Net amounts 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Offsetting Derivative Liabilities    
Gross amounts recognized 7,678us-gaap_DerivativeFairValueOfDerivativeLiability 5,182us-gaap_DerivativeFairValueOfDerivativeLiability
Gross amounts offset in the consolidated balance sheets 0us-gaap_DerivativeLiabilityFairValueGrossAsset 0us-gaap_DerivativeLiabilityFairValueGrossAsset
Net amounts presented in the consolidated balance sheets 7,678us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 5,182us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Financial instruments 44rnst_DerivativeFairValueAssetsNotOffset 5rnst_DerivativeFairValueAssetsNotOffset
Financial collateral pledged 6,761us-gaap_DerivativeCollateralRightToReclaimCash 4,879us-gaap_DerivativeCollateralRightToReclaimCash
Net amounts $ 873us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral $ 298us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral