Classified loans and leases

No definition available.

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

- Details

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Balance Type:	na
Period Type:	duration

- Definition

Percentage of portfolio guaranteed by the Department of Education.

+ References

No definition available.

+ Details

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

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

+ Details

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

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

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

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

+ Details

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

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

+ Details

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

Note 4 - Loans and Allowance for Loan Losses (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 16,400,000	$ 16,400,000		$ 30,800,000
Impaired Financing Receivable, Related Allowance	1,800,000	1,800,000		2,800,000
Impaired Financing Receivable, Interest Income, Accrual Method	161,000	665,000
Impaired Financing Receivable, Average Recorded Investment	16,500,000	22,400,000
Financing Receivable, Modifications, Number of Contracts			6
Financing Receivable, Modifications, Pre-Modification Recorded Investment			1,152,000
Loans Receivable [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	1,960,000,000	1,960,000,000		1,920,000,000
Student Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	28,392,000	28,392,000		34,145,000
Percentage of Portfolio	97.00%	97.00%
Restructured During Current Period [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment		321,000
Risk Ratings 6,7, and 8 [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans And Leases Receivable Classified	$ 38,100,000	$ 38,100,000		$ 39,000,000