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3) Investments: Investments Classified by Contractual Maturity Date (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
AmortizedCost | $ 230,386,875 |
Held to maturity securities, Estimated fair value | 234,224,153 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |
AmortizedCost | 13,731,279 | $ 9,503,016
Held to maturity securities, Estimated fair value | 13,542,789 | 9,551,537
Redeemable Preferred Stock |  |
AmortizedCost | 612,023 | 623,635
Held to maturity securities, Estimated fair value | 648,460 | $ 673,192
Due in 2017 |  |
AmortizedCost | 2,899,715 |
Held to maturity securities, Estimated fair value | 2,964,076 |
Due in 2018 Through 2021 |  |
AmortizedCost | 66,428,822 |
Held to maturity securities, Estimated fair value | 66,259,870 |
Due in 2022 Through 2026 |  |
AmortizedCost | 69,688,359 |
Held to maturity securities, Estimated fair value | 69,760,698 |
Due After 2026 |  |
AmortizedCost | 77,026,677 |
Held to maturity securities, Estimated fair value | $ 81,048,260 |

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