Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 7,571
Due after one year through five years	45,467
Due after five years through ten years	16,261
Due after ten years	8,188
Securities with contractual maturities	77,487
Total debt securities	141,951	$ 129,313
Estimated Fair Value
Due in one year or less	7,631
Due after one year through five years	47,594
Due after five years through ten years	17,503
Due after ten years	8,505
Securities with contractual maturities	81,233
Total debt securities	146,888	131,000
Asset-backed securities
Amortized Cost
Total debt securities	24,951	19,549
Estimated Fair Value
Total debt securities	24,901	19,575
Mortgage-backed securities
Amortized Cost
Total debt securities	23,187	31,389
Estimated Fair Value
Total debt securities	23,777	31,515
Commercial mortgage-backed securities
Amortized Cost
Total debt securities	9,941	9,972
Estimated Fair Value
Total debt securities	10,481	10,043
Collateralized mortgage obligations
Amortized Cost
Total debt securities	6,385	5,073
Estimated Fair Value
Total debt securities	$ 6,496	$ 5,088