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3) Investments: Investments Classified by Contractual Maturity Date (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
AmortizedCost | $ 231,474,083 | $ 228,397,623
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 239,858,942 | 241,498,409
Collateralized Mortgage Backed Securities |  |
AmortizedCost | 12,105,727 | 9,503,016
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 12,125,550 | 9,551,537
Redeemable Preferred Stock |  |
AmortizedCost | 623,635 | 623,635
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 652,099 | $ 673,192
DueIn2017Member |  |
AmortizedCost | 17,978,827 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 18,098,867 |
DueIn2018Through2021Member |  |
AmortizedCost | 67,126,658 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 67,514,026 |
DueIn2022Through2026Member |  |
AmortizedCost | 53,791,068 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 55,097,433 |
DueAfter2026Member |  |
AmortizedCost | 79,848,168 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | $ 86,370,967 |

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