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Note 5 - Loans Acquired (Details) - Impact of the Adjustments on the Company's Financial Results for the Following Reporting Periods (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Impact of the Adjustments on the Company's Financial Results for the Following Reporting Periods [Abstract]    
Impact on net interest income $ 26,400sfnc_CertainLoansAcquiredInTransferAccretableYieldAdjPeriodIncreaseDecrease $ 18,905sfnc_CertainLoansAcquiredInTransferAccretableYieldAdjPeriodIncreaseDecrease
Non-interest income (20,540)sfnc_FDICIndemnificationAssetAccretableYieldAdjustmentPeriodIncreaseDecrease (18,106)sfnc_FDICIndemnificationAssetAccretableYieldAdjustmentPeriodIncreaseDecrease
Net impact to pre-tax income 5,860sfnc_CertainLoansAcquiredInTransferAccretableYieldAdjPeriodIncreaseDecreaseNetPretax 799sfnc_CertainLoansAcquiredInTransferAccretableYieldAdjPeriodIncreaseDecreaseNetPretax
Net impact, net of taxes $ 3,561sfnc_CertainLoansAcquiredInTransferAccretableYieldAdjPeriodIncreaseDecreaseNet $ 486sfnc_CertainLoansAcquiredInTransferAccretableYieldAdjPeriodIncreaseDecreaseNet