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Derivative Instruments - Offsetting (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Offsetting Derivative Assets    
Gross amounts recognized $ 5us-gaap_DerivativeFairValueOfDerivativeAsset $ 2,818us-gaap_DerivativeFairValueOfDerivativeAsset
Gross amounts offset in the consolidated balance sheets 0us-gaap_DerivativeAssetFairValueGrossLiability 0us-gaap_DerivativeAssetFairValueGrossLiability
Net amounts presented in the consolidated balance sheets 5us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 2,818us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Financial instruments 5rnst_DerivativeFairValueLiabilitiesNotOffset 1,664rnst_DerivativeFairValueLiabilitiesNotOffset
Financial collateral pledged 0us-gaap_DerivativeCollateralObligationToReturnCash 0us-gaap_DerivativeCollateralObligationToReturnCash
Net amounts 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 1,154us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Offsetting Derivative Liabilities    
Gross amounts recognized 5,182us-gaap_DerivativeFairValueOfDerivativeLiability 3,315us-gaap_DerivativeFairValueOfDerivativeLiability
Gross amounts offset in the consolidated balance sheets 0us-gaap_DerivativeLiabilityFairValueGrossAsset 0us-gaap_DerivativeLiabilityFairValueGrossAsset
Net amounts presented in the consolidated balance sheets 5,182us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 3,315us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Financial instruments 5rnst_DerivativeFairValueAssetsNotOffset 1,664rnst_DerivativeFairValueAssetsNotOffset
Financial collateral pledged 4,879us-gaap_DerivativeCollateralRightToReclaimCash 0us-gaap_DerivativeCollateralRightToReclaimCash
Net amounts $ 298us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral $ 1,651us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral