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Note 13 - Common Stock (Details Textual) | Jul. 23, 2012 shares
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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