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Commitments and Credit Risk - Textual (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Other Commitments [Line Items] |  |
Outstanding letters of credit | $ 63,604,000 | $ 71,074,000
Standby Letters of Credit |  |
Other Commitments [Line Items] |  |
Deferred revenue | $ 0 | 0
Minimum |  |
Other Commitments [Line Items] |  |
Term of letter of credit | 9 months |
Maximum |  |
Other Commitments [Line Items] |  |
Term of letter of credit | 15 years |
Credit card commitments |  |
Other Commitments [Line Items] |  |
Outstanding commitments | $ 676,028,000 | 634,788,000
Other loan commitments |  |
Other Commitments [Line Items] |  |
Outstanding commitments | $ 2,674,548,000 | $ 3,991,931,000

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- Definition Letters of credit term. + References No definition available. + Details
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Namespace Prefix: | sfnc_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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Period Type: |

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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |