Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Securities	Dec. 31, 2019 USD ($) Securities
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	$ 11,647	$ 29,783
12 months or longer	0	6,037
Total	11,647	35,820
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]
Less than 12 months	94	220
12 months or longer	0	127
Total	94	347
Gross OTTI losses charged to realized gains	$ 0	$ 0
Number of securities in unrealized loss position | Securities	20	30
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	$ 7,045	$ 3,432
12 months or longer	0	3,533
Total	7,045	6,965
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]
Less than 12 months	26	22
12 months or longer	0	31
Total	26	53
Obligations of States and Political Subdivisions [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months		3,106
12 months or longer		0
Total		3,106
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]
Less than 12 months		53
12 months or longer		0
Total		53
Corporate Securities [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	4,602	23,245
12 months or longer	0	2,504
Total	4,602	25,749
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]
Less than 12 months	68	145
12 months or longer	0	96
Total	$ 68	$ 241