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21) Mortgage Servicing Rights: Schedule of Mortgage Servicing Rights (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Text Block [Abstract] |  |  |
Balance before valuation allowance at beginning of year |  | $ 17,155,529 | $ 20,016,822
MSR additions resulting from loan sales |  | 29,896,465 | 4,194,502
Amortization | [1] | (11,841,478) | (7,055,795)
Application of valuation allowance to write down MSRs with other than temporary impairment |  | 0 | 0
Balance before valuation allowance at year end |  | 35,210,516 | 17,155,529
Mortgage servicing rights, net |  | 35,210,516 | 17,155,529
Estimated fair value of MSRs at end of period |  | $ 38,702,358 | $ 22,784,571
[1] | Included in other expenses on the consolidated statements of earnings

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- Definition Represents the monetary amount of Application of valuation allowance to write down MSRs with other than temporary impairment, as of the indicated date. + References No definition available. + Details
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- Definition Represents the monetary amount of Balance before valuation allowance at beginning of year, as of the indicated date. + References No definition available. + Details
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- Definition Represents the monetary amount of Balance before valuation allowance at year end, as of the indicated date. + References No definition available. + Details
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- Definition Represents the monetary amount of Estimated fair value of MSRs at end of period, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | snfc_
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- Definition Represents the monetary amount of Mortgage servicing rights, net, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | snfc_
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- Definition Represents the monetary amount of MSRs proceeds from loan sales, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | snfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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