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3) Investments: Investments Classified by Contractual Maturity Date (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
AmortizedCost | $ 230,811,272 | $ 184,979,644
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 243,807,562 | 191,850,749
Collateralized Mortgage Backed Securities |  |
AmortizedCost | 9,764,566 | 9,488,083
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 9,846,716 | 9,428,612
Redeemable Preferred Stock |  |
AmortizedCost | 623,635 | 623,635
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 677,038 | $ 637,053
DueIn2017Member |  |
AmortizedCost | 1,205,533 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 1,208,929 |
DueIn2018Through2021Member |  |
AmortizedCost | 77,063,707 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 78,846,158 |
DueIn2022Through2026Member |  |
AmortizedCost | 54,265,268 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | 56,731,089 |
DueAfter2026Member |  |
AmortizedCost | 87,888,563 |
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. | $ 96,497,632 |

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