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Preparation of Interim Financial Statements (Details) | Mar. 31, 2024 center
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of financial centers | 233

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- Definition Represents the entity's number of financial centers as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | sfnc_
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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
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