3) Investments: Investments Classified by Contractual Maturity Date (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost	$ 327,205,498	$ 323,056,426
Held to maturity securities, Estimated fair value	348,628,792	329,145,562
Due in 1 year
Amortized Cost	61,039,649
Held to maturity securities, Estimated fair value	61,451,128
Due in 2-5 years
Amortized Cost	73,278,818
Held to maturity securities, Estimated fair value	76,149,038
Due in 5-10 years
Amortized Cost	82,777,913
Held to maturity securities, Estimated fair value	88,468,598
Due in more than 10 years
Amortized Cost	73,955,716
Held to maturity securities, Estimated fair value	85,927,291
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Amortized Cost	35,789,063	31,475,280
Held to maturity securities, Estimated fair value	36,264,337	31,832,498
Redeemable Preferred Stock
Amortized Cost	364,339	364,339
Held to maturity securities, Estimated fair value	$ 368,400	$ 364,339