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4) Loans Held For Sale: Schedule of loan loss reserve which is included in other liabilities and accrued expenses (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Text Block [Abstract] |  |
Beginning, Loan Loss Reserve | $ 4,046,288 | $ 3,604,869
Loan loss reserve, Provisions for losses | 1,524,435 | 643,284
Loan loss reserve, Charge-offs | (784,357) | (201,865)
Ending, Loan Loss Reserve | $ 4,786,366 | $ 4,046,288

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- Definition Represents the monetary amount of Beginning, Loan Loss Reserve, as of the indicated date. + References No definition available. + Details
Name: | snfc_BeginningLoanLossReserve
Namespace Prefix: | snfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the monetary amount of Ending, Loan Loss Reserve, as of the indicated date. + References No definition available. + Details
Name: | snfc_EndingLoanLossReserve
Namespace Prefix: | snfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the monetary amount of Loan loss reserve, Charge-offs, as of the indicated date. + References No definition available. + Details
Name: | snfc_LoanLossReserveChargeOffs
Namespace Prefix: | snfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the monetary amount of Loan loss reserve, Provisions for losses, as of the indicated date. + References No definition available. + Details
Name: | snfc_LoanLossReserveProvisionsForLosses
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