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12) Mortgage Servicing Rights: Summary of Unpaid Principal Balances of the Servicing Portfolio (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Text Block [Abstract]
Servicing Unpaid Principal Balance	$ 4,215,559,388	$ 2,804,139,415

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- Definition

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

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No definition available.

+ Details

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

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- References

No definition available.

+ Details

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