Investments - Amortized Cost and Fair Value of Investments Available-for-Sale by Contractual Maturity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Amortized Cost
Due within one year	$ 3,014,000		$ 3,014,000
Due after one year through five years	489,000		489,000
Due after five years through ten years	1,426,000		1,426,000
Due after ten years	2,107,000		2,107,000
Mortgage-backed securities	5,932,000		5,932,000
Amortized Cost	12,968,000		12,968,000		$ 9,085,000
Fair Value
Due within one year	3,016,000		3,016,000
Due after one year through five years	506,000		506,000
Due after five years through ten years	1,479,000		1,479,000
Due after ten years	2,228,000		2,228,000
Mortgage-backed securities	6,067,000		6,067,000
Estimated Fair Value	13,296,000		13,296,000		9,306,000
Pledged securities	0		0		$ 0
Sales of available for sale securities	$ 0	$ 0	$ 0	$ 0