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Summary of Aggregate fair value - Loans Held for Sale (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Loans Held For Sale
Aggregate fair value	$ 234,012,872	$ 302,776,827
Unpaid principal balance	228,907,138	294,481,503
Unrealized gain	$ 5,105,734	$ 8,295,324

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- Definition

Represents the monetary amount of Aggregate Fair Value - Loans Held For Sale, as of the indicated date.

+ References

No definition available.

+ Details

Name:	SNFCA_AggregateFairValueLoansHeldForSale
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Represents the monetary amount of Aggregate unpaid principal balance - Loans Held for Sale, as of the indicated date.

+ References

No definition available.

+ Details

Name:	SNFCA_AggregateUnpaidPrincipalBalanceLoansHeldForSale
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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

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- Definition

Represents the monetary amount of Unrealized gain - Loans Held for Sale, as of the indicated date.

+ References

No definition available.

+ Details

Name:	SNFCA_UnrealizedGainLoansHeldForSale
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant