Investments (Amortized Cost and Aggregate Fair Value of Debt Securities, by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 2,109
Available-for-sale Securities, Due in one year or less, Fair Value	2,119
Available-for-sale Securities, Due after one year through five years, Amortized Cost	15,403
Available-for-sale Securities, Due after one year through five years, Fair Value	16,409
Available-for-sale Securities, Due after five years through ten years, Amortized Cost	29,965
Available-for-sale Securities, Due after five years through ten years, Fair Value	30,489
Available-for-sale Securities, Due after ten years, Amortized Cost	36,547
Available-for-sale Securities, Due after ten years, Fair Value	37,869
Available-for-sale securities, Amortized Cost	84,024	79,074
Available-for-sale Securities, Fair Value	86,886
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	156
Held-to-maturity Securities, Due after one year through five years, Fair Value	163
Held-to-maturity Securities, Due after five years through ten years, Amortized Cost	136
Held-to-maturity Securities, Due after five years through ten years, Fair Value	149
Held-to-maturity Securities, Due after ten years, Amortized Cost	2,816
Held-to-maturity Securities, Due after ten years, Fair Value	2,870
Held-to-maturity Securities, Amortized Cost	3,108	812
Held-to-maturity Securities, Fair Value	$ 3,182	$ 853