Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 4,707	$ 4,436
Other comprehensive income:
Unrealized (loss) gain on securities (net of tax benefit of $77 in 2014 and tax expense of $539 in 2013)	(111)	780
Accretion of unrealized loss on securities reclassified to held-to-maturity (net of tax expense of $107)	155
Total comprehensive income	$ 4,751	$ 5,216