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Schedule of Mortgage Fee Income for Loans Held for Sale (Details) - USD ($)	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021	Dec. 31, 2021	[1]
Loans Held For Sale
Loan fees	$ 4,729,445	$ 9,552,788	$ 19,766,856		$ 28,247,365
Interest income	2,570,511	2,336,573	7,525,826		6,836,754
Secondary gains	28,940,898	55,440,961	103,336,118		179,900,770
Change in fair value of loan commitments	(3,271,282)	(380,696)	(2,843,155)		(549,093)
Change in fair value of loans held for sale	(4,131,363)	(259,307)	(7,973,171)		(8,319,820)
Provision for loan loss reserve	(230,321)	(432,468)	(829,243)	[1]	(1,701,700)	$ (2,211,230)
Mortgage fee income	$ 28,607,888	$ 66,257,851	$ 118,983,231		$ 204,414,276
[1] Included in mortgage fee income

X

- Definition

Represents the monetary amount of Change in fair value of loan commitments, during the indicated time period.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Change in fair value of loan held for sale.

+ References

No definition available.

+ Details

Name:	SNFCA_ChangeInFairValueOfLoanHeldForSale
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the monetary amount of Loan fees, during the indicated time period.

+ References

No definition available.

+ Details

Name:	SNFCA_LoanFees
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Mortgage fee income.

+ References

No definition available.

+ Details

Name:	SNFCA_MortgageFeeIncome
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the monetary amount of Secondary gains, during the indicated time period.

+ References

No definition available.

+ Details

Name:	SNFCA_SecondaryGains
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

+ References

No definition available.

+ Details

Name:	us-gaap_InterestAndOtherIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of expense related to estimated loss to be realized from lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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Balance Type:	debit
Period Type:	duration