3) Investments: Investments Classified by Contractual Maturity Date (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
AmortizedCost	$ 239,749,797
Held to maturity securities, Estimated fair value	257,437,835
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
AmortizedCost	17,020,727	$ 15,358,746
Held to maturity securities, Estimated fair value	17,710,031	15,277,280
Redeemable Preferred Stock
AmortizedCost	103,197	103,197
Held to maturity securities, Estimated fair value	117,236	$ 99,975
Due in 2017
AmortizedCost	3,135,187
Held to maturity securities, Estimated fair value	3,152,560
Due in 2018 Through 2021
AmortizedCost	85,443,407
Held to maturity securities, Estimated fair value	87,087,887
Due in 2022 Through 2026
AmortizedCost	66,438,645
Held to maturity securities, Estimated fair value	71,147,090
Due After 2026
AmortizedCost	67,608,634
Held to maturity securities, Estimated fair value	$ 78,223,031