Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 3,730	$ 1,585
Other comprehensive (loss) / income:
Unrealized security holding (losses) / gains arising during the period	(485)	3,213
Reclassification for net gains on investments included in net income	(3,586)	(303)
Other comprehensive (loss) / income before income tax (benefit) / expense	(4,071)	2,910
Income tax (benefit) / expense of other comprehensive income	(1,675)	1,198
Other comprehensive (loss) / income	(2,396)	1,712
Comprehensive income	$ 1,334	$ 3,297