Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) Securities	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Securities	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Securities
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	$ 21,796		$ 21,796		$ 29,783
12 months or longer	0		0		6,037
Total	21,796		21,796		35,820
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	1,383		1,383		220
12 months or longer	0		0		127
Total	1,383		1,383		$ 347
Gross OTTI losses charged to realized gains	$ 0	$ 0	$ 0	$ 0
Number of securities in unrealized loss position | Securities	20		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	$ 2,053		$ 2,053		$ 3,432
12 months or longer	0		0		3,533
Total	2,053		2,053		6,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	21		21		22
12 months or longer	0		0		31
Total	21		21		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	19,743		19,743		23,245
12 months or longer	0		0		2,504
Total	19,743		19,743		25,749
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	1,362		1,362		145
12 months or longer	0		0		96
Total	$ 1,362		$ 1,362		$ 241