Investments (Amortized Cost and Aggregate Fair Value of Debt Securities, by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investments [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 3,533
Available-for-sale Securities, Due in one year or less, Fair Value	3,622
Available-for-sale Securities, Due after one year through five years, Amortized Cost	14,967
Available-for-sale Securities, Due after one year through five years, Fair Value	15,451
Available-for-sale Securities, Due after five years through ten years, Amortized Cost	35,639
Available-for-sale Securities, Due after five years through ten years, Fair Value	36,295
Available-for-sale Securities, Due after ten years, Amortized Cost	42,080
Available-for-sale Securities, Due after ten years, Fair Value	43,676
Available-for-sale securities, Amortized Cost	96,219	$ 92,077
Available-for-sale Securities, Fair Value	99,044
Held-to-maturity Securities, Due in one year or less, Amortized Cost	0
Held-to-maturity Securities, Due in one year or less, Fair Value	0
Held-to-maturity Securities, Due after one year through five years, Amortized Cost	53
Held-to-maturity Securities, Due after one year through five years, Fair Value	54
Held-to-maturity Securities, Due after five years through ten years, Amortized Cost	93
Held-to-maturity Securities, Due after five years through ten years, Fair Value	102
Held-to-maturity Securities, Due after ten years, Amortized Cost	2,090
Held-to-maturity Securities, Due after ten years, Fair Value	2,201
Held-to-maturity Securities, Amortized Cost	2,236	2,439
Held-to-maturity Securities, Fair Value	$ 2,357	$ 2,504