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Loans and the Allowance for Loan Losses (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Loan
Dec. 31, 2013
Loan
Number of Loans    
Beginning balance (loans) 41rnst_FinancingReceivableModificationsNumberofLoans 36rnst_FinancingReceivableModificationsNumberofLoans
Additional loans with concessions (loans) 25rnst_AdditionalLoansWithConcessionsNumberOfContracts 13rnst_AdditionalLoansWithConcessionsNumberOfContracts
Reclassified as nonperforming (loans) (5)rnst_ReclassifiedAsNonperformingNumberOfContracts (2)rnst_ReclassifiedAsNonperformingNumberOfContracts
Paid in full (loans) (6)rnst_PaidinFullNumberofContracts  
Charge-offs (loans) (2)rnst_ChargeOffsNumberOfContracts (3)rnst_ChargeOffsNumberOfContracts
Lapse of concession period (loans)   (3)rnst_LapseOfConcessionPeriodNumberOfContracts
Ending balance (loans) 53rnst_FinancingReceivableModificationsNumberofLoans 41rnst_FinancingReceivableModificationsNumberofLoans
Recorded Investment    
Beginning balance $ 21,478us-gaap_FinancingReceivableModificationsRecordedInvestment $ 29,436us-gaap_FinancingReceivableModificationsRecordedInvestment
Additional loans with concessions 3,554rnst_AdditionalLoansWithConcessionsRestructuredLoans 4,336rnst_AdditionalLoansWithConcessionsRestructuredLoans
Reclassified as nonperforming (3,196)rnst_ReclassifiedAsNonperformingRestructuredLoans (3,227)rnst_ReclassifiedAsNonperformingRestructuredLoans
Paid in full (6,659)rnst_RestructuredLoansPaidinFull  
Charge-offs (191)rnst_TransferToOtherRealEstateOwnedRestructuredLoans (1,301)rnst_TransferToOtherRealEstateOwnedRestructuredLoans
Principal paydowns (649)rnst_PrincipalPaydownsRestructuredLoans (2,025)rnst_PrincipalPaydownsRestructuredLoans
Lapse of concession period   (5,741)rnst_LapseOfConcessionPeriodRestructuredLoans
Ending balance $ 14,337us-gaap_FinancingReceivableModificationsRecordedInvestment $ 21,478us-gaap_FinancingReceivableModificationsRecordedInvestment