CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 4,987	$ 5,373	$ 9,424	$ 11,020
Other comprehensive income:
Unrealized (loss) gain on securities (net of tax benefit of $3,900 and $3,361 in 2013 and tax expense of $343 and $1,346 in 2012)	(5,646)	586	(4,866)	1,950
Reclassification adjustment for gains included in net income (net of tax expense of $17 in 2013 and $92 in 2012)	(25)	(134)	(25)	(134)
Total comprehensive (loss) income	$ (684)	$ 5,825	$ 4,533	$ 12,836