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Fair Value Measurements - (Details 6) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Aggregate Fair Value  
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value  
Mortgage loans held for sale measured at fair value $ 102,780us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_AggregateFairValueMember
Past due loans of 90 days or more 0us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_AggregateFairValueMember
Nonaccrual loans 0rnst_NonaccrualLoans
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_AggregateFairValueMember
Aggregate Unpaid Principal Balance  
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value  
Mortgage loans held for sale measured at fair value 102,382us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_AggregateUnpaidPrincipalBalanceMember
Past due loans of 90 days or more 0us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_AggregateUnpaidPrincipalBalanceMember
Nonaccrual loans 0rnst_NonaccrualLoans
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_AggregateUnpaidPrincipalBalanceMember
Difference  
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value  
Mortgage loans held for sale measured at fair value 398us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_DifferenceMember
Past due loans of 90 days or more 0us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_DifferenceMember
Nonaccrual loans $ 0rnst_NonaccrualLoans
/ us-gaap_FairValueByMeasurementBasisAxis
= rnst_DifferenceMember