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Regulatory Matters (Details)
Mar. 31, 2015
Minimum  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Common Equity Tier 1 to Risk - Weighted Assets - Well capitalized 6.50%rnst_CommonEquityTierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Common Equity Tier 1 to Risk - Weighted Assets - Adequately capitalized 4.50%rnst_CommonEquityTierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Common Equity Tier 1 to Risk - Weighted Assets - Undercapitalized 4.50%rnst_CommonEquityTierOneLeverageCapitalRequiredToBeUndercapitalizedToAverageAssets
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Common Equity Tier 1 to Risk - Weighted Assets - Significantly Undercapitalized 3.00%rnst_CommonEquityTierOneLeverageCapitalRequiredToBeSignificantlyUndercapitalizedtoAverageAssets
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Well capitalized | Minimum  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Tier 1 Capital to Average Assets (Leverage) 5.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 Capital to Risk – Weighted Assets 8.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total Capital to Risk – Weighted Assets 10.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Adequately capitalized | Minimum  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Tier 1 Capital to Average Assets (Leverage) 4.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_AdequatelyCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 Capital to Risk – Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_AdequatelyCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total Capital to Risk – Weighted Assets 8.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_AdequatelyCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Undercapitalized | Maximum  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Tier 1 Capital to Average Assets (Leverage) 4.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_UndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Tier 1 Capital to Risk – Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_UndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Total Capital to Risk – Weighted Assets 8.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_UndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Significantly undercapitalized | Maximum  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Tier 1 Capital to Average Assets (Leverage) 3.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_SignificantlyUndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Tier 1 Capital to Risk – Weighted Assets 4.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_SignificantlyUndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Total Capital to Risk – Weighted Assets 6.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_SignificantlyUndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Critically undercapitalized | Maximum  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Tier 1 Capital to Risk – Weighted Assets 2.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_CapitalUnitsByClassAxis
= rnst_CriticallyUndercapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember