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Derivative Instruments and Hedging Activities (Schedule of Maturiries of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Within one year	$ 447,023
One to three years	674,749
Three to five years	526,226
Five to ten years	485,037
Ten to fifteen years	27,231
Fifteen years and thereafter	14,272
Total	$ 2,174,538	$ 1,984,608

X

- Definition

Derivative instruments maturity, in fifteen years and thereafter.

+ References

No definition available.

+ Details

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X

- Definition

Derivative instruments maturity, in five to ten years.

+ References

No definition available.

+ Details

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Namespace Prefix:	sf_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Derivative Instruments Maturity, in Next twelve months.

+ References

No definition available.

+ Details

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Namespace Prefix:	sf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Derivative instruments maturity, in one to three years.

+ References

No definition available.

+ Details

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Namespace Prefix:	sf_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Derivative instruments maturity, in ten to fifteen years.

+ References

No definition available.

+ Details

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Namespace Prefix:	sf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Derivative instruments maturity, in three to five years

+ References

No definition available.

+ Details

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Namespace Prefix:	sf_
Data Type:	xbrli:monetaryItemType
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X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

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