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Note 3 - Investment Securities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Securities Continuous Unrealized Loss Position, Fair Value	$ 1,400,000,000	$ 1,200,000,000
Securities Continuous Unrealized Loss Position Fair Value Percent of Portfolio	73.50%	75.70%
Available-for-sale Securities Pledged as Collateral	$ 1,200,000,000	$ 915,200,000
Available-for-sale Securities, Gross Realized Gains	2,400,000	5,800,000	$ 350,000
Available-for-sale Securities, Gross Realized Losses	$ 1,300,000	$ 0	$ 43,000
Income Tax Benefit Related to Security Gains (Losses) Percentage	39.225%

X

- Definition

Represents the tax expense/benefit related to security gains/losses as a percentage of the gross amounts.

+ References

No definition available.

+ Details

Name:	sfnc_IncomeTaxBenefitRelatedToSecurityGainsLossesPercentage
Namespace Prefix:	sfnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Unrealized loss position which are categorized as held-to-maturity or available-for-sale.

+ References

No definition available.

+ Details

Name:	sfnc_SecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix:	sfnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized as held-to-maturity or available-for-sale as a percentage of the total held-to-maturity and available-for-sale investment portfolio.

+ References

No definition available.

+ Details

Name:	sfnc_SecuritiesContinuousUnrealizedLossPositionFairValuePercentOfPortfolio
Namespace Prefix:	sfnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant