CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 2,762	$ 2,659	$ 8,330	$ 5,388
Other comprehensive income:
Unrealized holding gains (losses) on securities arising during the period	2,690	(704)	1,477	2,249
Other comprehensive income (loss) before tax	2,690	(704)	1,477	2,249
Income tax (expense) benefit related to items of other comprehensive income	(1,107)	291	(607)	(926)
Other comprehensive income (loss)	1,583	(413)	870	1,323
Total comprehensive income	$ 4,345	$ 2,246	$ 9,200	$ 6,711