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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