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Note 6 - Loans Acquired - Impact of the Adjustments on the Company's Financial Results for the Following Reporting Periods (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Impact on net interest income and pre-tax income | $ 23 | $ 65 | $ 2,596 | $ 1,240
Net impact, net of taxes | $ 14 | $ 40 | $ 1,578 | $ 754

X
- Definition The amount of increase/decrease in interest income for the current year due to the accretable yield adjustment. + References No definition available. + Details
Name: | sfnc_CertainLoansAcquiredInTransferAccretableYieldAdjPeriodIncreaseDecrease
Namespace Prefix: | sfnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of increase/decrease in net after-tax income for the current year due to the accretable yield adjustment. + References No definition available. + Details
Name: | sfnc_CertainLoansAcquiredInTransferAccretableYieldAdjPeriodIncreaseDecreaseNet
Namespace Prefix: | sfnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration