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Note 4 - Other Assets and Other Liabilities Held for Sale (Details Textual) $ in Thousands	Dec. 31, 2017 USD ($)
Other Assets Held-for-sale	$ 165,780
Other Liabilities Held-for-sale	$ 157,366

X

- Definition

Assets held for sale that are classified as other.

+ References

No definition available.

+ Details

Name:	sfnc_OtherAssetsHeldForSale
Namespace Prefix:	sfnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Liabilities held for sale that are classified as other.

+ References

No definition available.

+ Details

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