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Note 4 - Loans and Allowance for Loan Losses (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]      
Loans and Leases Receivable, Gross $ 2,740,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 2,400,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount  
Impaired Financing Receivable, Recorded Investment 14,669,000us-gaap_ImpairedFinancingReceivableRecordedInvestment 18,316,000us-gaap_ImpairedFinancingReceivableRecordedInvestment  
Impaired Financing Receivable, Related Allowance 2,065,000us-gaap_ImpairedFinancingReceivableRelatedAllowance 1,960,000us-gaap_ImpairedFinancingReceivableRelatedAllowance  
Impaired Financing Receivable, Interest Income, Accrual Method 764,000us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 882,000us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 1,800,000us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Impaired Financing Receivable, Average Recorded Investment 17,482,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 21,579,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 34,800,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Financing Receivable, Modifications, Number of Contracts 3us-gaap_FinancingReceivableModificationsNumberOfContracts2 1us-gaap_FinancingReceivableModificationsNumberOfContracts2  
Financing Receivable, Modifications, Pre-Modification Recorded Investment 2,025,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 321,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1  
Acquired Impaired Loans, Carrying Value 682,913,000sfnc_AcquiredImpairedLoansCarryingValue [1] 662,297,000sfnc_AcquiredImpairedLoansCarryingValue [1]  
Covered Purchased Impaired Loans, Allowance 1,000,000sfnc_CoveredPurchasedImpairedLoansAllowance    
Provision for Loan Losses, Net of FDIC Loss Share Adjustments 400,000sfnc_ProvisionForLoanLossesNetOfFDICLossShareAdjustments    
Provision for Loan and Lease Losses 7,245,000us-gaap_ProvisionForLoanAndLeaseLosses 4,118,000us-gaap_ProvisionForLoanAndLeaseLosses 4,140,000us-gaap_ProvisionForLoanAndLeaseLosses
Loans and Leases Receivable, Allowance 29,028,000us-gaap_LoansAndLeasesReceivableAllowance 27,442,000us-gaap_LoansAndLeasesReceivableAllowance  
Restructured During Current Period [Member]      
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]      
Financing Receivable, Modifications, Number of Contracts 2,025,000us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sfnc_RestructuredDuringCurrentPeriodMember		 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sfnc_RestructuredDuringCurrentPeriodMember		  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   321,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sfnc_RestructuredDuringCurrentPeriodMember		  
Restructured Loan [Member]      
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]      
Financing Receivable, Modifications, Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sfnc_RestructuredLoanMember		    
Proceeds from Collection of Loans Receivable 598,000us-gaap_ProceedsFromCollectionOfLoansReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sfnc_RestructuredLoanMember		    
Loans Acquired, Covered by FDIC Loss Share [Member]      
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]      
Provision for Loan and Lease Losses 363,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfnc_LoansAcquiredCoveredByFDICLossShareMember		    
Allowance for Loan and Lease Losses, Write-offs 954,000us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfnc_LoansAcquiredCoveredByFDICLossShareMember		    
Financing Receivable, Allowance for Credit Losses, Recovery 591,000us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfnc_LoansAcquiredCoveredByFDICLossShareMember		    
Including Loans Acquired, Covered by FDIC Loss Share [Member]      
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]      
Loans and Leases Receivable, Allowance 29,982,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfnc_IncludingLoansAcquiredCoveredByFDICLossShareMember		    
Risk Ratings 6,7, and 8 [Member]      
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]      
Loans And Leases Receivable Classified 82,100,000sfnc_LoansAndLeasesReceivableClassified
/ us-gaap_CreditRatingStandardPoorsAxis
= sfnc_RiskRatings67And8Member		 94,500,000sfnc_LoansAndLeasesReceivableClassified
/ us-gaap_CreditRatingStandardPoorsAxis
= sfnc_RiskRatings67And8Member		  
Metropolitan [Member]      
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]      
Acquired Impaired Loans, Carrying Value 22,300,000sfnc_AcquiredImpairedLoansCarryingValue
/ us-gaap_BusinessAcquisitionAxis
= sfnc_MetropolitanMember		 27,400,000sfnc_AcquiredImpairedLoansCarryingValue
/ us-gaap_BusinessAcquisitionAxis
= sfnc_MetropolitanMember		  
Loans And Leases Receivable Classified $ 16,600,000sfnc_LoansAndLeasesReceivableClassified
/ us-gaap_BusinessAcquisitionAxis
= sfnc_MetropolitanMember		 $ 31,200,000sfnc_LoansAndLeasesReceivableClassified
/ us-gaap_BusinessAcquisitionAxis
= sfnc_MetropolitanMember		  
[1] Loans acquired include $106.9 million (net of $1.0 million allowance) and $146.7 million of loans covered by FDIC loss share agreements at December 31, 2014 and 2013, respectively.