Investment Securities Available for Sale (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 237,767	$ 172,534
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	830
1 Year up to 5 Years	10,367
5 Year up to 10 Years	0
Fair Value	11,197
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	2,906
1 Year up to 5 Years	20,206
5 Year up to 10 Years	7,536
Fair Value	30,648
U.S. mortgage backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	0
1 Year up to 5 Years	214
5 Year up to 10 Years	0
Fair Value	214
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	854
1 Year up to 5 Years	5,791
5 Year up to 10 Years	0
Fair Value	6,645
U.S. asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	0
1 Year up to 5 Years	5,061
5 Year up to 10 Years	0
Fair Value	5,061
Government agencies
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	0
1 Year up to 5 Years	192
5 Year up to 10 Years	0
Fair Value	192
Index-linked U.S. bonds
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	0
1 Year up to 5 Years	254
5 Year up to 10 Years	0
Fair Value	254
Marketable debt securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	4,590
1 Year up to 5 Years	42,085
5 Year up to 10 Years	7,536
Fair Value	$ 54,211	$ 54,060