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Note 22 - Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets (Details) (Parentheticals) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Parent Company [Member] |  |
Unrealized depreciation on available-for-sale securities, net of income taxes | $ (6,108) | $ (9,818)

X
- Definition Amount of income tax related to the accumulated appreciation or loss in value of the total of available-for-sale securities at the end of an accounting period. + References No definition available. + Details
Name: | sfnc_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Namespace Prefix: | sfnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |