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Schedule of Value of Business Acquired (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Balance at beginning of year | $ 8,955,249 | $ 9,876,647
Value of business acquired | 586,840 |
Imputed interest at 7% included in earnings | 613,028 | 670,565
Amortization included in earnings | (1,728,157) | (1,457,390)
Shadow amortization included in other comprehensive income | (5,528) | (134,573)
Net amortization | (1,120,657) | (921,398)
Balance at end of year | $ 8,421,432 | $ 8,955,249

X
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Balance Type: | credit
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X
- Definition Represents the monetary amount of Shadow amortization included in other comprehensive income, during the indicated time period. + References No definition available. + Details
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X
- Definition Represents the monetary amount of Value of business acquired, balance at start of period, as of the indicated date. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Represents the monetary amount of Value of business acquired - amortization, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
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X
- Definition Represents the monetary amount of Value of business acquired - net amortization charged to income, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
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- Definition Value of Business Acquired, Intangible Assets and Goodwill. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration