Investments Aging of Unrealized Losses by Class (Details) $ in Thousands	Dec. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
US Government and Government Agencies and Authorities
Less Than Twelve Months
Number of Securities | security	37	45
Gross unrealized losses	$ 89	$ 111
Fair Value	$ 26,372	$ 28,464
Twelve Months or More
Number of securities | security	39	55
Gross unrealized losses	$ 104	$ 1,204
Fair Value	$ 31,364	$ 61,264
Foreign Government Debt Securities
Less Than Twelve Months
Number of Securities | security	0	5
Gross unrealized losses	$ 0	$ 16
Fair Value	$ 0	$ 2,978
Twelve Months or More
Number of securities | security	2	0
Gross unrealized losses	$ 1	$ 0
Fair Value	$ 600	$ 0
US States and Political Subdivisions Debt Securities
Less Than Twelve Months
Number of Securities | security	31	49
Gross unrealized losses	$ 61	$ 272
Fair Value	$ 14,508	$ 38,469
Twelve Months or More
Number of securities | security	2	91
Gross unrealized losses	$ 2	$ 1,029
Fair Value	$ 1,262	$ 68,115
Public Utility, Bonds
Less Than Twelve Months
Number of Securities | security	9	30
Gross unrealized losses	$ 25	$ 374
Fair Value	$ 4,626	$ 13,685
Twelve Months or More
Number of securities | security	2	19
Gross unrealized losses	$ 1	$ 307
Fair Value	$ 250	$ 7,805
Corporate Debt Securities
Less Than Twelve Months
Number of Securities | security	42	351
Gross unrealized losses	$ 124	$ 3,149
Fair Value	$ 22,435	$ 144,769
Twelve Months or More
Number of securities | security	27	208
Gross unrealized losses	$ 19	$ 3,010
Fair Value	$ 9,605	$ 117,351
Mortgage Backed Securities
Less Than Twelve Months
Number of Securities | security	89	87
Gross unrealized losses	$ 322	$ 1,303
Fair Value	$ 59,101	$ 88,754
Twelve Months or More
Number of securities | security	50	135
Gross unrealized losses	$ 155	$ 2,180
Fair Value	$ 12,738	$ 70,510
Asset-backed Securities
Less Than Twelve Months
Number of Securities | security	15	67
Gross unrealized losses	$ 34	$ 136
Fair Value	$ 8,447	$ 41,871
Twelve Months or More
Number of securities | security	5	7
Gross unrealized losses	$ 7	$ 3
Fair Value	$ 1,259	$ 1,372
Redeemable Preferred Stock
Less Than Twelve Months
Number of Securities | security	0	8
Gross unrealized losses	$ 0	$ 62
Fair Value	$ 0	$ 711
Twelve Months or More
Number of securities | security	1	2
Gross unrealized losses	$ 2	$ 77
Fair Value	$ 97	$ 8,377
Fixed Maturities
Less Than Twelve Months
Number of Securities | security	223	642
Gross unrealized losses	$ 655	$ 5,423
Fair Value	$ 135,489	$ 359,701
Twelve Months or More
Number of securities | security	128	517
Gross unrealized losses	$ 291	$ 7,810
Fair Value	$ 57,175	$ 334,794