Investments (Amortized Cost and Aggregate Fair Value of Debt Securities, by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 1,782
Available-for-sale Securities, Due in one year or less, Fair Value	1,821
Available-for-sale Securities, Due after one year through five years, Amortized Cost	15,258
Available-for-sale Securities, Due after one year through five years, Fair Value	16,462
Available-for-sale Securities, Due after five years through ten years, Amortized Cost	27,505
Available-for-sale Securities, Due after five years through ten years, Fair Value	28,023
Available-for-sale Securities, Due after ten years, Amortized Cost	34,907
Available-for-sale Securities, Due after ten years, Fair Value	35,016
Available-for-sale securities, Amortized Cost	79,452	79,074
Available-for-sale Securities, Fair Value	81,322
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	225
Held-to-maturity Securities, Due after one year through five years, Fair Value	237
Held-to-maturity Securities, Due after five years through ten years, Amortized Cost	165
Held-to-maturity Securities, Due after five years through ten years, Fair Value	177
Held-to-maturity Securities, Due after ten years, Amortized Cost	382
Held-to-maturity Securities, Due after ten years, Fair Value	407
Held-to-maturity Securities, Amortized Cost	772	812
Held-to-maturity Securities, Fair Value	$ 821	$ 853