Investments (Held-to-Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,890	$ 2,439
Held-to-maturity securities, unrealized gains	40	65
Held-to-maturity securities, unrealized losses	0	0
Fair Value	1,930	2,504
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,863	2,395
Held-to-maturity securities, unrealized gains	38	62
Held-to-maturity securities, unrealized losses	0	0
Fair Value	1,901	2,457
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	27	44
Held-to-maturity securities, unrealized gains	2	3
Held-to-maturity securities, unrealized losses	0	0
Fair Value	$ 29	$ 47