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Mergers and Acquisitions - Assets Acquired and Liabilities Assumed (Details) (First M&F Merger, USD $)
In Thousands, unless otherwise specified
Sep. 01, 2013
Business Acquisition [Line Items]  
Cash and cash equivalents $ 169,995us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
Securities 227,693us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
Mortgage loans held for sale 1,659rnst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedMortgageLoansHeldforSale
Premises and equipment 32,075rnst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPremisesandEquipment
Other real estate owned 13,527rnst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherRealEstateOwned
Intangible assets 115,159us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Other assets 57,259us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
Total assets 1,516,603us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Deposits 1,325,872rnst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits
Borrowings 25,346us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
Other liabilities 9,861us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
Loans, net of unearned income  
Business Acquisition [Line Items]  
Loans, net of unearned income $ 899,236us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= rnst_FirstMFMergerMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_LoansMember