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