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Note 13 - Common Stock (Details Textual)	Jul. 23, 2012 shares
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	850,000
Percent of Outstanding Stock	5.00%

X

- Definition

Percentage of outstanding stock.

+ References

No definition available.

+ Details

Name:	sfnc_PercentOfOutstandingStock
Namespace Prefix:	sfnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant