Investments (Amortized Cost and Aggregate Fair Value of Debt Securities, by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 1,209
Available-for-sale Securities, Due in one year or less, Fair Value	1,220
Available-for-sale Securities, Due after one year through five years, Amortized Cost	17,042
Available-for-sale Securities, Due after one year through five years, Fair Value	18,112
Available-for-sale Securities, Due after five years through ten years, Amortized Cost	29,435
Available-for-sale Securities, Due after five years through ten years, Fair Value	30,121
Available-for-sale Securities, Due after ten years, Amortized Cost	38,768
Available-for-sale Securities, Due after ten years, Fair Value	40,448
Available-for-sale securities, Amortized Cost	86,454	84,024
Available-for-sale Securities, Fair Value	89,901
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	134
Held-to-maturity Securities, Due after one year through five years, Fair Value	141
Held-to-maturity Securities, Due after five years through ten years, Amortized Cost	129
Held-to-maturity Securities, Due after five years through ten years, Fair Value	141
Held-to-maturity Securities, Due after ten years, Amortized Cost	2,504
Held-to-maturity Securities, Due after ten years, Fair Value	2,623
Held-to-maturity Securities, Amortized Cost	2,767	3,108
Held-to-maturity Securities, Fair Value	$ 2,905	$ 3,182