Investments Aggregate unrealized loss position (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value		$ 14,241
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		755
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value		1,545
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		9
Continuously held in unrealized loss position, Estimated Fair Value		15,786
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		764
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value	$ 1,497	4,067
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	50
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value	2,609	1,545
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	47	9
Continuously held in unrealized loss position, Estimated Fair Value	4,106	5,612
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	48	59
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value	2,892	9,996
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	157
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value	7,500	1,545
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	170	9
Continuously held in unrealized loss position, Estimated Fair Value	10,392	11,541
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	173	166
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value	0	626
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	13
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value	606	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	14	0
Continuously held in unrealized loss position, Estimated Fair Value	606	626
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	14	13
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value	800	2,876
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	57
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value	2,134	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	69	0
Continuously held in unrealized loss position, Estimated Fair Value	2,934	2,876
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	70	57
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value	595	2,427
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	37
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value	2,151	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	40	0
Continuously held in unrealized loss position, Estimated Fair Value	2,746	2,427
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ 41	37
Common Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value		3,570
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		313
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Continuously held in unrealized loss position, Estimated Fair Value		3,570
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		313
Warrant [Member]
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value		675
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		285
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Continuously held in unrealized loss position, Estimated Fair Value		675
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		285
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Continuously held in unrealized loss position,Less than 12 Months, Estimated Fair Value		4,245
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		598
Continuously held in unrealized loss position, Greater than 12 Months, Estimated Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Continuously held in unrealized loss position, Estimated Fair Value		4,245
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		$ 598