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Fair Value Measurements - (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Fair Value Measurements (Textual) [Abstract]      
Impaired loans not covered under loss-share agreements $ 7,662rnst_ContractualBalanceImpairedLoansMeasuredAtFairValueOnNonrecurringBasis   $ 13,349rnst_ContractualBalanceImpairedLoansMeasuredAtFairValueOnNonrecurringBasis
Specific reserve included in allowance for loan losses 683us-gaap_LoansAndLeasesReceivableOtherAllowance   989us-gaap_LoansAndLeasesReceivableOtherAllowance
Changes in fair value, gain (loss) 27us-gaap_FairValueOptionChangesInFairValueGainLoss1 (64)us-gaap_FairValueOptionChangesInFairValueGainLoss1  
Impairment losses on mortgage servicing rights $ 0us-gaap_MortgageServicingRightsMSRImpairmentRecovery $ 0us-gaap_MortgageServicingRightsMSRImpairmentRecovery