XML 130 R110.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Note 19 - New Accounting Standards (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity, Effects of Tax Law Changes |  |  |  |
Income Tax Expense (Benefit) |  | 61,983 | $ 46,624 | $ 32,900
Accounting Standards Update 2016-09 [Member] |  |  |  |
Income Tax Expense (Benefit) |  | (1,700) |  |
Retained Earnings [Member] |  |  |  |
Stockholders' Equity, Effects of Tax Law Changes |  | $ 3,016 |  |
Retained Earnings [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |
Stockholders' Equity, Effects of Tax Law Changes | $ 3,000 |  |  |

X
- Definition Impact on stockholders' equity of the effects of tax law changes during the period. + References No definition available. + Details
Name: | sfnc_StockholdersEquityEffectsOfTaxLawChanges
Namespace Prefix: | sfnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201609Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NewAccountingPronouncementEarlyAdoptionAxis=us-gaap_NewAccountingPronouncementEarlyAdoptionEffectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |