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3) Investments: Investments Classified by Contractual Maturity Date (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
AmortizedCost | $ 218,409,812 | $ 228,397,623
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 223,523,658 | 241,498,409
Collateralized Mortgage Backed Securities |  |
AmortizedCost | 12,411,842 | 9,503,016
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 12,316,415 | 9,551,537
Redeemable Preferred Stock |  |
AmortizedCost | 623,635 | 623,635
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 660,103 | $ 673,192
DueIn2017Member |  |
AmortizedCost | 4,672,982 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 4,780,152 |
DueIn2018Through2021Member |  |
AmortizedCost | 66,946,075 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 66,997,789 |
DueIn2022Through2026Member |  |
AmortizedCost | 56,121,102 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 56,597,254 |
DueAfter2026Member |  |
AmortizedCost | 77,634,176 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | $ 82,171,945 |

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