Investments - Schedule of securities in continuous unrealized loss position (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale
Less than 12 months, fair value	$ 43	$ 4,548
Less than 12 months, unrealized loss	0	(47)
12 months or more, fair value	164	15,965
12 months or more, unrealized loss	(3)	(276)
Total, fair value	207	20,513
Total, unrealized loss	(3)	(323)
Commercial mortgage backed securities issued by U.S. Agencies
Debt Securities, Available-for-sale
Less than 12 months, fair value	43	4,472
Less than 12 months, unrealized loss	0	(46)
12 months or more, fair value	164	0
12 months or more, unrealized loss	(3)	0
Total, fair value	207	4,472
Total, unrealized loss	$ (3)	(46)
Residential mortgage backed securities issued by U.S. Agencies
Debt Securities, Available-for-sale
Less than 12 months, fair value		76
Less than 12 months, unrealized loss		(1)
12 months or more, fair value		15,965
12 months or more, unrealized loss		(276)
Total, fair value		16,041
Total, unrealized loss		$ (277)