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4) Loans Held For Sale: Aggregate fair value - Loans Held for Sale (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Text Block [Abstract] |  |
Aggregate Fair Value - Loans Held For Sale | $ 304,030,372 | $ 422,772,418
Aggregate unpaid principal balance - Loans Held for Sale | 294,207,728 | 406,407,323
Unrealized gain - Loans Held for Sale | $ 9,822,644 | $ 16,365,095

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