Investment Securities Maturities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in One Year or Less, Amortized Cost Basis	$ 115,166
Due After One Year Through Five, Amortized Cost Basis	56,644
Due After Five Years Through Ten Years, Amortized Cost Basis	590
Due After Ten Years, Amortized Cost Basis	500
Asset-backed Securities, Amortized Cost Basis	25,919
Total Fixed Income Secutities, Amortized Cost Basis	198,819
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in One Year or Less, Fair Value	116,159
Due After One Year Through Five, Fair Value	56,700
Due After One Year Through Five, Fair Value	588
Due After Ten Years, Fair Value	496
Asset-backed Securities, Fair Value	24,801
Total Fixed Income Secutities, Fair Value	$ 198,744	$ 183,787