Investments (Amortized Cost and Aggregate Fair Value of Debt Securities, by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investments [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 2,038
Available-for-sale Securities, Due in one year or less, Fair Value	2,069
Available-for-sale Securities, Due after one year through five years, Amortized Cost	15,799
Available-for-sale Securities, Due after one year through five years, Fair Value	16,127
Available-for-sale Securities, Due after five years through ten years, Amortized Cost	34,131
Available-for-sale Securities, Due after five years through ten years, Fair Value	33,956
Available-for-sale Securities, Due after ten years, Amortized Cost	42,022
Available-for-sale Securities, Due after ten years, Fair Value	43,167
Available-for-sale securities, Amortized Cost	93,990	$ 92,077
Available-for-sale Securities, Fair Value	95,319
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	66
Held-to-maturity Securities, Due after one year through five years, Fair Value	69
Held-to-maturity Securities, Due after five years through ten years, Amortized Cost	99
Held-to-maturity Securities, Due after five years through ten years, Fair Value	108
Held-to-maturity Securities, Due after ten years, Amortized Cost	2,205
Held-to-maturity Securities, Due after ten years, Fair Value	2,298
Held-to-maturity Securities, Amortized Cost	2,370	2,439
Held-to-maturity Securities, Fair Value	$ 2,475	$ 2,504