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3) Investments: Investments Classified by Contractual Maturity Date (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
AmortizedCost $ 193,208,660 $ 184,979,644
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. 205,044,443 191,850,749
Collateralized Mortgage Backed Securities    
AmortizedCost 10,612,465 9,488,083
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. 10,691,387 9,428,612
Redeemable Preferred Stock    
AmortizedCost 623,635 623,635
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. 663,473 $ 637,053
DueIn2017Member    
AmortizedCost 2,711,324  
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. 2,725,318  
DueIn2018Through2021Member    
AmortizedCost 50,865,992  
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. 52,437,835  
DueIn2022Through2026Member    
AmortizedCost 43,504,148  
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. 45,811,635  
DueAfter2026Member    
AmortizedCost 84,891,096  
Represents the monetary amount of HeldToMaturitySecuritiesEstimatedFairValue, as of the indicated date. $ 92,714,795