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12) Mortgage Servicing Rights: Summary of Unpaid Principal Balances of the Servicing Portfolio (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Text Block [Abstract] |  |
Servicing Unpaid Principal Balance | $ 5,824,986,566 | $ 5,070,287,864

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- 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

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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