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Note 21 - Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets (Details) (Parentheticals) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Parent Company [Member] |  |
Unrealized depreciation on available-for-sale securities, net of income taxes | $ (9,818) | $ (1,720)

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

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