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Regulatory Matters (Details)
Dec. 31, 2014
Well capitalized | Minimum  
Guidelines specify capital tiers  
Tier 1 Capital to Average Assets (Leverage) (percent) 5.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 Capital to Risk - Weighted Assets (percent) 6.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total Capital to Risk - Weighted Assets (percent) 10.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Adequately capitalized | Minimum  
Guidelines specify capital tiers  
Tier 1 Capital to Average Assets (Leverage) (percent) 4.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_AdequatelyCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 Capital to Risk - Weighted Assets (percent) 4.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_AdequatelyCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total Capital to Risk - Weighted Assets (percent) 8.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_AdequatelyCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Undercapitalized | Maximum  
Guidelines specify capital tiers  
Tier 1 Capital to Average Assets (Leverage) (percent) 4.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_UndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Tier 1 Capital to Risk - Weighted Assets (percent) 4.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_UndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Total Capital to Risk - Weighted Assets (percent) 8.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_UndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Significantly undercapitalized | Maximum  
Guidelines specify capital tiers  
Tier 1 Capital to Average Assets (Leverage) (percent) 3.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_SignificantlyUndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Tier 1 Capital to Risk - Weighted Assets (percent) 3.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_SignificantlyUndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Total Capital to Risk - Weighted Assets (percent) 6.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_SignificantlyUndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Critically undercapitalized | Maximum  
Guidelines specify capital tiers  
Tier 1 Capital to Risk - Weighted Assets (percent) 2.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_CriticallyUndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember