Investments (Amortized Cost and Aggregate Fair Value of Debt Securities, by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 237
Available-for-sale Securities, Due in one year or less, Fair Value	262
Available-for-sale Securities, Due after one year through five years, Amortized Cost	12,634
Available-for-sale Securities, Due after one year through five years, Fair Value	13,087
Available-for-sale Securities, Due after five years through ten years, Amortized Cost	30,542
Available-for-sale Securities, Due after five years through ten years, Fair Value	30,572
Available-for-sale Securities, Due after ten years, Amortized Cost	43,357
Available-for-sale Securities, Due after ten years, Fair Value	44,608
Available-for-sale securities, Amortized Cost	86,770	$ 84,024
Available-for-sale Securities, Fair Value	88,529
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	97
Held-to-maturity Securities, Due after one year through five years, Fair Value	101
Held-to-maturity Securities, Due after five years through ten years, Amortized Cost	113
Held-to-maturity Securities, Due after five years through ten years, Fair Value	122
Held-to-maturity Securities, Due after ten years, Amortized Cost	2,334
Held-to-maturity Securities, Due after ten years, Fair Value	2,437
Held-to-maturity Securities, Amortized Cost	2,544	3,108
Held-to-maturity Securities, Fair Value	$ 2,660	$ 3,182