Investments - Amortized Cost and Fair Value of Investments Available-for-Sale by Contractual Maturity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Amortized Cost
Due within one year	$ 1,043,000		$ 1,043,000
Due after one year through five years	490,000		490,000
Due after five years through ten years	1,433,000		1,433,000
Due after ten years	1,195,000		1,195,000
Mortgage-backed securities	5,706,000		5,706,000
Amortized Cost	9,867,000		9,867,000		$ 9,085,000
Fair Value
Due within one year	1,046,000		1,046,000
Due after one year through five years	508,000		508,000
Due after five years through ten years	1,485,000		1,485,000
Due after ten years	1,324,000		1,324,000
Mortgage-backed securities	5,835,000		5,835,000
Estimated Fair Value	10,198,000		10,198,000		9,306,000
Pledged securities	0		0		$ 0
Sales of available for sale securities	$ 0	$ 0	$ 0	$ 0