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Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets 2 (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Parent Company
Unrealized depreciation on available-for-sale securities, net of income taxes	$ 21,132	$ 7,392

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

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Namespace Prefix:	sfnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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