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Bank Deposits (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Bank Deposits [Line Items] |  |
Weighted average interest rate on deposits | 0.35% | 0.10%
Brokerage Customers Deposits [Member] |  |
Bank Deposits [Line Items] |  |
Deposits of related parties | $ 13,600.0 | $ 13,400.0
Stifel Nicolaus [Member] |  |
Bank Deposits [Line Items] |  |
Interest bearing and time deposits of executive officers, directors, and affiliates | $ 0.1 | $ 0.2

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- Definition Bank deposits. + References No definition available. + Details
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Namespace Prefix: | sf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest bearing and time deposit of officials. + References No definition available. + Details
Name: | sf_InterestBearingAndTimeDepositOfOfficials
Namespace Prefix: | sf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The weighted average interest rate for domestic time deposit liabilities. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=sf_StifelNicolausMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |