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Investments in Securities and Fair Value Investments in Securities (Schedule of Unrealized Losses on Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Government obligations
Debt Securities, Available-for-sale [Line Items]
Total temporarily impaired securities, Less than 12 Months, Fair Value	$ 1,016	$ 1,042
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses	(7)	(1)
Total temporarily impaired securities, 12 Months or Longer, Fair Value	0	0
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total temporarily impaired securities, Total Fair Value	1,016	1,042
Total temporarily impaired securities, Unrealized Losses	(7)	(1)
General obligations of U.S. states, territories and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Total temporarily impaired securities, Less than 12 Months, Fair Value	4,888	4,560
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses	(32)	(27)
Total temporarily impaired securities, 12 Months or Longer, Fair Value	6,469	3,535
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(111)	(23)
Total temporarily impaired securities, Total Fair Value	11,357	8,095
Total temporarily impaired securities, Unrealized Losses	(143)	(50)
Special revenue issuer obligations of U.S. states, territories and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Total temporarily impaired securities, Less than 12 Months, Fair Value	12,326	13,551
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses	(100)	(61)
Total temporarily impaired securities, 12 Months or Longer, Fair Value	9,720	4,023
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(229)	(104)
Total temporarily impaired securities, Total Fair Value	22,046	17,574
Total temporarily impaired securities, Unrealized Losses	(329)	(165)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total temporarily impaired securities, Less than 12 Months, Fair Value	4,490	3,744
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses	(28)	(7)
Total temporarily impaired securities, 12 Months or Longer, Fair Value	3,733	0
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(19)	0
Total temporarily impaired securities, Total Fair Value	8,223	3,744
Total temporarily impaired securities, Unrealized Losses	(47)	(7)
Total fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Total temporarily impaired securities, Less than 12 Months, Fair Value	22,720	22,897
Total temporarily impaired securities, Less than 12 Months, Unrealized Losses	(167)	(96)
Total temporarily impaired securities, 12 Months or Longer, Fair Value	19,922	7,558
Total temporarily impaired securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(359)	(127)
Total temporarily impaired securities, Total Fair Value	42,642	30,455
Total temporarily impaired securities, Unrealized Losses	$ (526)	$ (223)

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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