XML 90 R79.htm IDEA: XBRL DOCUMENT
v3.21.2

Borrowings and Federal Home Loan Bank Advances (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 27, 2021 USD ($) | Sep. 30, 2021 USD ($) item | Sep. 30, 2021 USD ($) item
Short-term Debt [Line Items] |  |  |
Uncommitted secured lines of credit |  |  | $ 880,000,000.0
Number of banks | item |  | 4 | 4
Daily borrowings under our uncommitted secured lines |  | $ 50,000,000.0 | $ 50,000,000.0
Compensating balances |  | 0 | 0
Federal Home Loan Bank Advances Floating Rate |  | 52,000,000.0 | 52,000,000.0
Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Credit facility expiration date | 2026-05 |  |
Committed revolving credit facility with bank and broker dealer - subsidiary | $ 500,000,000.0 |  |
Credit facility sublimit | $ 200,000,000.0 |  |
Outstanding credit facility |  | $ 0 | 0
Company Owned Securities [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Uncommitted secured lines of credit |  |  | $ 0
Federal Home Loan Bank advances [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Weighted average interest rate on borrowings |  | 0.28% | 0.28%

X
- Definition Daily borrowings under credit arrangements. + References No definition available. + Details
Name: | sf_DailyBorrowingsUnderCreditArrangements
Namespace Prefix: | sf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of credit facility expiration month and year. + References No definition available. + Details
Name: | sf_LineOfCreditFacilityExpirationMonthAndYear
Namespace Prefix: | sf_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Facility Sublimit. + References No definition available. + Details
Name: | sf_LineOfCreditFacilitySublimit
Namespace Prefix: | sf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of banks with which entity has committed revolving credit facility. + References No definition available. + Details
Name: | sf_NumberOfBanksWithWhichEntityHasCommittedRevolvingCreditFacility
Namespace Prefix: | sf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Uncommitted secured lines of credit. + References No definition available. + Details
Name: | sf_UncommittedSecuredLinesOfCredit
Namespace Prefix: | sf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Weighted average interest rate on borrowings. + References No definition available. + Details
Name: | sf_WeightedAverageInterestRateOnBorrowings
Namespace Prefix: | sf_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CompensatingBalanceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with floating interest rate. + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesFloatingRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CreditFacilityAxis=sf_TwoThousandAndTwentyOneCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=sf_CompanyOwnedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_FederalHomeLoanBankAdvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |