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3) Investments: Held-to-maturity Securities (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Available for sale securities, Amortized Cost | $ 256,894,421 |  | $ 265,150,484 |
Available for sale securities, Unrecognized Holding Gain | 23,418,581 |  | 30,456,040 |
Available for sale securities, Unrecognized Holding Loss | (762,474) |  | (949,845) |
Available for sale securities, Estimated fair value | 279,550,528 |  | 294,656,679 |
Mortgage loans on real estate and construction | 244,951,952 |  | 249,343,936 |
Mortgage loans on real estate and construction, unamortized deferred loan fees, net | (1,223,014) |  | (1,161,132) |
Mortgage loans on real estate and construction, allowance for losses | (1,897,155) |  | (2,005,127) |
Mortgage loans on real estate and construction, Discount | (710,280) |  | (1,260,896) |
Real estate held for investment, net of depreciation | 157,040,536 |  | 131,684,453 |
Real estate held for sale | 5,556,866 |  | 7,878,807 |
Policy loans | 13,946,739 |  | 14,171,589 |
Insurance assignments | 54,618,319 |  | 53,231,131 |
Federal Home Loan Bank stock | 2,544,700 | [1] | 2,506,600 | [2]
Other investments | 5,242,786 |  | 5,432,816 |
Allowance for doubtful accounts | (1,662,394) |  | (1,645,475) |
Total policy loans and other investments | 74,690,150 |  | 73,696,661 |
Accrued investment income | 6,266,403 |  | 5,360,523 |
Total investments | 779,210,930 |  | 773,945,298 |
US Treasury Securities |  |  |  |
Available for sale securities, Amortized Cost | 42,427,856 |  | 42,381,805 |
Available for sale securities, Unrecognized Holding Gain | 1,099,519 |  | 1,358,562 |
Available for sale securities, Unrecognized Holding Loss | 0 |  |  |
Available for sale securities, Estimated fair value | 43,527,375 |  | 43,740,367 |
US States and Political Subdivisions Debt Securities |  |  |  |
Available for sale securities, Amortized Cost | 5,370,754 |  | 5,383,762 |
Available for sale securities, Unrecognized Holding Gain | 209,554 |  | 312,214 |
Available for sale securities, Unrecognized Holding Loss | (24,569) |  | (1,261) |
Available for sale securities, Estimated fair value | 5,555,739 |  | 5,694,715 |
Corporate Debt Securities |  |  |  |
Available for sale securities, Amortized Cost | 179,026,864 |  | 186,067,912 |
Available for sale securities, Unrecognized Holding Gain | 21,203,792 |  | 27,216,496 |
Available for sale securities, Unrecognized Holding Loss | (501,358) |  | (681,478) |
Available for sale securities, Estimated fair value | 199,729,298 |  | 212,602,930 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |
Available for sale securities, Amortized Cost | 29,799,733 |  | 31,047,791 |
Available for sale securities, Unrecognized Holding Gain | 892,449 |  | 1,565,377 |
Available for sale securities, Unrecognized Holding Loss | (236,547) |  | (267,106) |
Available for sale securities, Estimated fair value | 30,455,635 |  | 32,346,062 |
Redeemable Preferred Stock |  |  |  |
Available for sale securities, Amortized Cost | 269,214 |  | 269,214 |
Available for sale securities, Unrecognized Holding Gain | 13,267 |  | 3,391 |
Available for sale securities, Unrecognized Holding Loss | 0 |  | 0 |
Available for sale securities, Estimated fair value | 282,481 |  | 272,605 |
Industrial, miscellaneous and all other |  |  |  |
Available-for-sale Securities, Amortized Cost Basis | 8,913,275 |  | 9,698,490 |
Available-for-sale Securities, Gross Unrealized Gain | 2,586,343 |  | 2,376,156 |
Available For Sale Securities - Gross Unrealized Losses | (345,123) |  | (750,407) |
Available for Sale Securities - Estimated Fair Value | 11,154,495 |  | 11,324,239 |
Equity Securities |  |  |  |
Available-for-sale Securities, Amortized Cost Basis | 8,913,275 |  | 9,698,490 |
Available-for-sale Securities, Gross Unrealized Gain | 2,586,343 |  | 2,376,156 |
Available For Sale Securities - Gross Unrealized Losses | (345,123) |  | (750,407) |
Available for Sale Securities - Estimated Fair Value | 11,154,495 |  | 11,324,239 |
Residential Mortgage |  |  |  |
Mortgage loans on real estate and construction | 88,266,355 |  | 95,822,448 |
Real estate held for investment, net of depreciation | 39,752,530 |  | 24,843,743 |
Real estate held for sale | 1,156,313 |  | 3,478,254 |
Residential construction |  |  |  |
Mortgage loans on real estate and construction | 105,450,591 |  | 111,111,777 |
Commercial |  |  |  |
Mortgage loans on real estate and construction | 55,065,455 |  | 46,836,866 |
Real estate held for investment, net of depreciation | 117,288,006 |  | 106,840,710 |
Real estate held for sale | $ 4,400,553 |  | $ 4,400,553 |
[1] | Includes $905,700 of Membership stock and $1,639,000 of Activity stock due to short-term borrowings.
[2] | Includes $866,900 of Membership stock and $1,639,700 of Activity stock due to short-term borrowings.

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