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Note 9 - Other Borrowings and Subordinated Debentures (Details) (USD $)
3 Months Ended
Dec. 31, 2013
Mar. 31, 2015
Dec. 31, 2014
Note 9 - Other Borrowings and Subordinated Debentures (Details) [Line Items]      
Unsecured Debt   $ 43,100,000us-gaap_UnsecuredDebt $ 43,100,000us-gaap_UnsecuredDebt
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months   40,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate  
Advances from Federal Home Loan Banks   242,000,000us-gaap_AdvancesFromFederalHomeLoanBanks  
Advances from Federal Home Loan Bank Available   821,700,000sfnc_AdvancesFromFederalHomeLoanBankAvailable  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   919,500,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1  
Metropolitan [Member]      
Note 9 - Other Borrowings and Subordinated Debentures (Details) [Line Items]      
Unsecured Debt $ 46,000,000us-gaap_UnsecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= sfnc_MetropolitanMember
   
Debt Instrument, Term 3 years