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Mortgage Servicing Rights: Summary of Unpaid Principal Balances of the Servicing Portfolio (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Servicing Unpaid Principal Balance	$ 6,280,506,543	$ 5,070,287,864

X

- Definition

Represents the monetary amount of Servicing Unpaid Principal Balance, as of the indicated date.

+ References

No definition available.

+ Details

Name:	snfc_ServicingUnpaidPrincipalBalance
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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