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v3.23.1

Schedule of Assumptions Used in Determining MSR Value (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Prepayment speed | 8.80 | 8.12
Average life | 8 years 1 month 6 days | 8 years 5 months 26 days
Discount rate | 11.78 | 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