Investments (Held-to-Maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,741	$ 1,890
Held-to-maturity securities, unrealized gains	48	40
Held-to-maturity securities, unrealized losses	0	0
Fair Value	1,789	1,930
Mortgage backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,736	1,863
Held-to-maturity securities, unrealized gains	48	38
Held-to-maturity securities, unrealized losses	0	0
Fair Value	1,784	1,901
U.S. Treasury securities and obligations of U.S. Government corporations and agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	5	27
Held-to-maturity securities, unrealized gains	0	2
Held-to-maturity securities, unrealized losses	0	0
Fair Value	$ 5	$ 29