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Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets 2 (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Parent Company |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Unrealized depreciation on available-for-sale securities, net of income taxes | $ (3,731) | $ 21,132

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- 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | srt_CondensedBalanceSheetStatementsCaptionsLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |