Investments (Schedule of Continuous Losses) (Details) $ in Thousands	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 38,271	$ 19,493
Less than 12 Months, Gross Unrealized Losses	997	408
12 Months or Longer, Fair Value	16,951	17,129
12 Months or Longer, Gross Unrealized Losses	837	558
Total Fair Value	55,222	36,622
Total Gross Unrealized Losses	$ 1,834	$ 966
Total Securities in a Loss Position	98	64
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 17,812	$ 6,567
Less than 12 Months, Gross Unrealized Losses	471	166
12 Months or Longer, Fair Value	5,950	5,607
12 Months or Longer, Gross Unrealized Losses	277	155
Total Fair Value	23,762	12,174
Total Gross Unrealized Losses	$ 748	$ 321
Total Securities in a Loss Position	40	20
Mortgage backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 7,180	$ 5,872
Less than 12 Months, Gross Unrealized Losses	257	124
12 Months or Longer, Fair Value	2,124	2,281
12 Months or Longer, Gross Unrealized Losses	199	150
Total Fair Value	9,304	8,153
Total Gross Unrealized Losses	$ 456	$ 274
Total Securities in a Loss Position	21	17
Private label asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 1,163
Less than 12 Months, Gross Unrealized Losses	3
12 Months or Longer, Fair Value	0
12 Months or Longer, Gross Unrealized Losses	0
Total Fair Value	1,163
Total Gross Unrealized Losses	$ 3
Total Securities in a Loss Position	2
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 3,928	$ 2,176
Less than 12 Months, Gross Unrealized Losses	43	7
12 Months or Longer, Fair Value	2,528	2,574
12 Months or Longer, Gross Unrealized Losses	81	47
Total Fair Value	6,456	4,750
Total Gross Unrealized Losses	$ 124	$ 54
Total Securities in a Loss Position	13	9
U.S. Treasury securities and obligations of U.S. Government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 8,188	$ 4,878
Less than 12 Months, Gross Unrealized Losses	223	111
12 Months or Longer, Fair Value	6,349	6,667
12 Months or Longer, Gross Unrealized Losses	280	206
Total Fair Value	14,537	11,545
Total Gross Unrealized Losses	$ 503	$ 317
Total Securities in a Loss Position	22	18