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Summary of Aggregate fair value - Loans Held for Sale (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Loans Held For Sale |  |
Aggregate fair value | $ 312,655,843 | $ 422,772,418
Unpaid principal balance | 304,132,748 | 406,407,323
Unrealized gain | $ 8,523,095 | $ 16,365,095

X
- Definition Represents the monetary amount of Aggregate Fair Value - Loans Held For Sale, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
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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
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
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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
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant