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Note 6 - Loans Acquired - Summary of the Changes in the FDIC True-Up Provision (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Balance	$ 8,308
Amortization expense	107
Adjustments related to changes in expected losses	720
Loss share termination agreement	(9,135)
Balance

X

- Definition

Represents the FDIC true up provision amortization.

+ References

No definition available.

+ Details

Name:	sfnc_FDICTrueUpProvisionAmortization
Namespace Prefix:	sfnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the true up provision, change in expected losses.

+ References

No definition available.

+ Details

Name:	sfnc_FDICTrueUpProvisionChangeInExpectedLosses
Namespace Prefix:	sfnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of write-off of FDIC true-up provision under the loss share termination agreement.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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