Investments (Held-to-Maturity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,802	$ 1,890
Held-to-maturity securities, unrealized gains	33	40
Held-to-maturity securities, unrealized losses	0	0
Fair Value	1,835	1,930
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,795	1,863
Held-to-maturity securities, unrealized gains	32	38
Held-to-maturity securities, unrealized losses	0	0
Fair Value	1,827	1,901
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	7	27
Held-to-maturity securities, unrealized gains	1	2
Held-to-maturity securities, unrealized losses	0	0
Fair Value	$ 8	$ 29