Investment Securities Available for Sale (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 180,836	$ 172,534
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	5,216
1 Year up to 5 Years	9,754
5 Year up to 10 Years	0
Fair Value	14,970
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	1,919
1 Year up to 5 Years	20,671
5 Year up to 10 Years	7,714
Fair Value	30,304
U.S. mortgage backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year
1 Year up to 5 Years	219
5 Year up to 10 Years
Fair Value	219
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	427
1 Year up to 5 Years	6,278
5 Year up to 10 Years	0
Fair Value	6,705
U.S. asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	251
1 Year up to 5 Years	3,744
5 Year up to 10 Years
Fair Value	3,995
Index-linked U.S. bonds
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year
1 Year up to 5 Years	252
5 Year up to 10 Years
Fair Value	252
Marketable debt securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	7,813
1 Year up to 5 Years	40,918
5 Year up to 10 Years	7,714
Fair Value	$ 56,445	$ 54,060