3) Investments: Held-to-maturity Securities (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
AmortizedCost	$ 230,386,875
Held to maturity securities, Estimated fair value	234,224,153
Accrued investment income	3,751,942	$ 3,644,077
Total investments	584,624,491	629,484,618
Total
AmortizedCost	230,386,875	228,397,623
Held-to-maturity Securities, Unrecognized Holding Gain	7,898,977
Held-to-maturity Securities, Unrecognized Holding Loss	(4,061,699)
Held to maturity securities, Estimated fair value	234,224,153	241,498,409
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		14,921,048
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(1,820,262)
US Treasury Securities
AmortizedCost	53,683,435	54,077,069
Held-to-maturity Securities, Unrecognized Holding Gain	142,299
Held-to-maturity Securities, Unrecognized Holding Loss	(1,248,029)
Held to maturity securities, Estimated fair value	52,577,705	53,709,470
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		211,824
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(579,423)
US Treasury Securities \| Total
Held-to-maturity Securities, Unrecognized Holding Loss	(1,248,029)	(579,423)
US States and Political Subdivisions Debt Securities
AmortizedCost	6,987,405	5,843,176
Held-to-maturity Securities, Unrecognized Holding Gain	40,224
Held-to-maturity Securities, Unrecognized Holding Loss	(190,262)
Held to maturity securities, Estimated fair value	6,837,367	5,884,535
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		112,372
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(71,013)
US States and Political Subdivisions Debt Securities \| Total
Held-to-maturity Securities, Unrecognized Holding Loss	(190,262)	(71,013)
Corporate Debt Securities
AmortizedCost	155,372,733	158,350,727
Held-to-maturity Securities, Unrecognized Holding Gain	7,544,943
Held-to-maturity Securities, Unrecognized Holding Loss	(2,299,844)
Held to maturity securities, Estimated fair value	160,617,832	171,679,675
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		14,336,452
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(1,007,504)
Corporate Debt Securities \| Total
Held-to-maturity Securities, Unrecognized Holding Loss	(2,299,844)	(1,007,504)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
AmortizedCost	13,731,279	9,503,016
Held-to-maturity Securities, Unrecognized Holding Gain	135,074
Held-to-maturity Securities, Unrecognized Holding Loss	(323,564)
Held to maturity securities, Estimated fair value	13,542,789	9,551,537
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		210,652
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(162,131)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises \| Total
Held-to-maturity Securities, Unrecognized Holding Loss	(323,564)	(162,131)
Redeemable Preferred Stock
AmortizedCost	612,023	623,635
Held-to-maturity Securities, Unrecognized Holding Gain	36,437
Held-to-maturity Securities, Unrecognized Holding Loss	0
Held to maturity securities, Estimated fair value	648,460	673,192
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		49,748
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(191)
Redeemable Preferred Stock \| Total
Held-to-maturity Securities, Unrecognized Holding Loss		(191)
Industrial, miscellaneous and all other
Available-for-sale Securities, Amortized Cost Basis	5,891,712	6,002,931
Available-for-sale Securities, Gross Unrealized Gain	786,960	667,593
Available For Sale Securities - Gross Unrealized Losses	(689,754)
Available for Sale Securities - Estimated Fair Value	5,988,918	6,037,855
AvailableForSaleSecuritiesGrossUnrealizedLosses		(632,669)
Available-for-sale Securities, Gross Unrealized Gain	(786,960)	(667,593)
Available for Sale Securities - Estimated Fair Value	(5,988,918)	(6,037,855)
Equity Securities
Available-for-sale Securities, Amortized Cost Basis	5,891,712	6,002,931
Available-for-sale Securities, Gross Unrealized Gain	786,960	667,593
Available For Sale Securities - Gross Unrealized Losses	(689,754)
Available for Sale Securities - Estimated Fair Value	5,988,918	6,037,855
AvailableForSaleSecuritiesGrossUnrealizedLosses		(632,669)
Available-for-sale Securities, Gross Unrealized Gain	(786,960)	(667,593)
Available for Sale Securities - Estimated Fair Value	(5,988,918)	(6,037,855)
Residential Mortgage
Mortgage loans on real estate and construction	79,930,807	102,527,111
Residential construction
Mortgage loans on real estate and construction	71,330,891	50,157,533
Commercial Loan
Mortgage loans on real estate and construction	$ 32,869,447	$ 54,954,865

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