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3) Investments: Held-to-maturity Securities (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
AmortizedCost | $ 230,386,875 |
Held to maturity securities, Estimated fair value | 234,224,153 |
Accrued investment income | 3,751,942 | $ 3,644,077
Total investments | 584,624,491 | 629,484,618
Total |  |
AmortizedCost | 230,386,875 | 228,397,623
Held-to-maturity Securities, Unrecognized Holding Gain | 7,898,977 |
Held-to-maturity Securities, Unrecognized Holding Loss | (4,061,699) |
Held to maturity securities, Estimated fair value | 234,224,153 | 241,498,409
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 14,921,048
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (1,820,262)
US Treasury Securities |  |
AmortizedCost | 53,683,435 | 54,077,069
Held-to-maturity Securities, Unrecognized Holding Gain | 142,299 |
Held-to-maturity Securities, Unrecognized Holding Loss | (1,248,029) |
Held to maturity securities, Estimated fair value | 52,577,705 | 53,709,470
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 211,824
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (579,423)
US Treasury Securities | Total |  |
Held-to-maturity Securities, Unrecognized Holding Loss | (1,248,029) | (579,423)
US States and Political Subdivisions Debt Securities |  |
AmortizedCost | 6,987,405 | 5,843,176
Held-to-maturity Securities, Unrecognized Holding Gain | 40,224 |
Held-to-maturity Securities, Unrecognized Holding Loss | (190,262) |
Held to maturity securities, Estimated fair value | 6,837,367 | 5,884,535
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 112,372
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (71,013)
US States and Political Subdivisions Debt Securities | Total |  |
Held-to-maturity Securities, Unrecognized Holding Loss | (190,262) | (71,013)
Corporate Debt Securities |  |
AmortizedCost | 155,372,733 | 158,350,727
Held-to-maturity Securities, Unrecognized Holding Gain | 7,544,943 |
Held-to-maturity Securities, Unrecognized Holding Loss | (2,299,844) |
Held to maturity securities, Estimated fair value | 160,617,832 | 171,679,675
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 14,336,452
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (1,007,504)
Corporate Debt Securities | Total |  |
Held-to-maturity Securities, Unrecognized Holding Loss | (2,299,844) | (1,007,504)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |
AmortizedCost | 13,731,279 | 9,503,016
Held-to-maturity Securities, Unrecognized Holding Gain | 135,074 |
Held-to-maturity Securities, Unrecognized Holding Loss | (323,564) |
Held to maturity securities, Estimated fair value | 13,542,789 | 9,551,537
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 210,652
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (162,131)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Total |  |
Held-to-maturity Securities, Unrecognized Holding Loss | (323,564) | (162,131)
Redeemable Preferred Stock |  |
AmortizedCost | 612,023 | 623,635
Held-to-maturity Securities, Unrecognized Holding Gain | 36,437 |
Held-to-maturity Securities, Unrecognized Holding Loss | 0 |
Held to maturity securities, Estimated fair value | 648,460 | 673,192
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 49,748
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (191)
Redeemable Preferred Stock | Total |  |
Held-to-maturity Securities, Unrecognized Holding Loss |  | (191)
Industrial, miscellaneous and all other |  |
Available-for-sale Securities, Amortized Cost Basis | 5,891,712 | 6,002,931
Available-for-sale Securities, Gross Unrealized Gain | 786,960 | 667,593
Available For Sale Securities - Gross Unrealized Losses | (689,754) |
Available for Sale Securities - Estimated Fair Value | 5,988,918 | 6,037,855
AvailableForSaleSecuritiesGrossUnrealizedLosses |  | (632,669)
Available-for-sale Securities, Gross Unrealized Gain | (786,960) | (667,593)
Available for Sale Securities - Estimated Fair Value | (5,988,918) | (6,037,855)
Equity Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 5,891,712 | 6,002,931
Available-for-sale Securities, Gross Unrealized Gain | 786,960 | 667,593
Available For Sale Securities - Gross Unrealized Losses | (689,754) |
Available for Sale Securities - Estimated Fair Value | 5,988,918 | 6,037,855
AvailableForSaleSecuritiesGrossUnrealizedLosses |  | (632,669)
Available-for-sale Securities, Gross Unrealized Gain | (786,960) | (667,593)
Available for Sale Securities - Estimated Fair Value | (5,988,918) | (6,037,855)
Residential Mortgage |  |
Mortgage loans on real estate and construction | 79,930,807 | 102,527,111
Residential construction |  |
Mortgage loans on real estate and construction | 71,330,891 | 50,157,533
Commercial Loan |  |
Mortgage loans on real estate and construction | $ 32,869,447 | $ 54,954,865

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