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Note 5 - Loans Acquired - Summary of the Changes in the FDIC True-Up Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Balance | $ 8,308 | $ 6,768
Amortization expense | 107 | 168
Adjustments related to changes in expected losses | 720 | 1,372
Balance |  | $ 8,308
Loss share termination agreement | $ (9,135) |

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