XML 95 R84.htm IDEA: XBRL DOCUMENT
v3.21.2

Bank Deposits (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Bank Deposits [Line Items] |  |
Weighted average interest rate on deposits | 0.03% | 0.09%
Brokerage Customers Deposits [Member] |  |
Bank Deposits [Line Items] |  |
Deposits of related parties | $ 18,600.0 | $ 16,000.0
Stifel Nicolaus [Member] |  |
Bank Deposits [Line Items] |  |
Interest bearing and time deposits of executive officers, directors, and affiliates | $ 9.9 | $ 6.7

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

X
- 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

X
- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average interest rate for domestic time deposit liabilities. + References No definition available. + Details
Name: | us-gaap_WeightedAverageRateDomesticDepositTimeDeposits
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=sf_PaymentFromBrokerageCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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