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Schedule of Mortgage Fee Income for Loans Held for Sale (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Loans Held For Sale
Loan fees	$ 5,520,465	$ 4,388,414
Interest income	1,482,819	2,007,058
Secondary gains	14,730,974	17,961,358
Change in fair value of loan commitments	561,778	677,952
Change in fair value of loans held for sale	(300,890)	794,614
Provision for loan loss reserve	(163,476)	159,610
Mortgage fee income	$ 21,831,670	$ 25,989,006

X

- Definition

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

+ References

No definition available.

+ Details

Name:	SNFCA_ChangeInFairValueOfLoanCommitments
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

X

- References

No definition available.

+ Details

Name:	SNFCA_DisclosureLoansHeldForSaleAbstract
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

Provision for loan loss reserve.

+ References

No definition available.

+ Details

Name:	SNFCA_ProvisionForLoanLossReserve
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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