XML 139 R114.htm IDEA: XBRL DOCUMENT
v3.20.4

Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets 2 (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Parent Company |  |
Unrealized depreciation on available-for-sale securities, net of income taxes | $ 21,132 | $ 7,392

X
- Definition Amount of income tax related to the accumulated appreciation or loss in value of the total of available-for-sale securities at the end of an accounting period. + References No definition available. + Details
Name: | sfnc_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Namespace Prefix: | sfnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |