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Note 1 - Basis of Presentation (Details) (Subsequent Event [Member], Ozark Trust & Investment Corporation [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended
Apr. 28, 2015
Note 1 - Basis of Presentation (Details) [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 1,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Business Combination, Consideration Transferred 20,700us-gaap_BusinessCombinationConsiderationTransferred1
Employee Stock Option [Member]  
Note 1 - Basis of Presentation (Details) [Line Items]  
Business Combination, Step Acquisition, Equity Interest in Acquiree 1,000sfnc_BusinessCombinationStepAcquisitionEquityInterestInAcquiree
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= sfnc_OzarkTrustInvestmentCorporationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Banks or Bank Holding Companies [Member]
  
Note 1 - Basis of Presentation (Details) [Line Items]  
Business Combination, Stock Conversion, Cash Issued 701.9268sfnc_BusinessCombinationStockConversionCashIssued
/ us-gaap_BusinessAcquisitionAxis
= sfnc_OzarkTrustInvestmentCorporationMember
/ us-gaap_CounterpartyNameAxis
= sfnc_BanksOrBankHoldingCompaniesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Any Other Type of Shareholder [Member]
  
Note 1 - Basis of Presentation (Details) [Line Items]  
Business Combination, Stock Conversion, Shares issued 16.7205sfnc_BusinessCombinationStockConversionSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= sfnc_OzarkTrustInvestmentCorporationMember
/ us-gaap_CounterpartyNameAxis
= sfnc_AnyOtherTypeOfShareholderMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember