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Preparation of Interim Financial Statements (Details)	Sep. 30, 2024 center
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of financial centers	234

X

- 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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