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Schedule of Assumptions Used in Determining MSR Value (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Prepayment speed	9.70	8.12
Average life	7 years 9 months 14 days	8 years 5 months 26 days
Discount rate	11.85	11.95

X

- Definition

Average Life In Years.

+ References

No definition available.

+ Details

Name:	SNFCA_AverageLifeInYears
Namespace Prefix:	SNFCA_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the Discount Rate, during the indicated time period.

+ References

No definition available.

+ Details

Name:	SNFCA_DiscountRate
Namespace Prefix:	SNFCA_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Prepayment speed.

+ References

No definition available.

+ Details

Name:	SNFCA_PrepaymentSpeeds
Namespace Prefix:	SNFCA_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration