Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 3,113	$ 2,935	$ 8,966	$ 8,289
Net unrealized holding (losses) gains on securities:
Unrealized holding (losses) gains arising during the period	(875)	1,547	4,944	1,333
Reclassification adjustment for gains included in net income	(316)	(83)	(650)	(800)
Other comprehensive (loss) income	(1,191)	1,464	4,294	533
Unrealized holding (losses) gains arising during the period	(298)	526	1,681	453
Reclassification adjustment for gains included in net income	(107)	(29)	(221)	(273)
Other comprehensive (loss) income	(405)	497	1,460	180
Unrealized holding (losses) gains arising during the period	(577)	1,021	3,263	880
Reclassification adjustment for gains included in net income	(209)	(54)	(429)	(527)
Other comprehensive (loss) income	(786)	967	2,834	353
Total comprehensive income	1,922	4,399	13,260	8,822
Net income	821	715	2,311	1,999
Total comprehensive income	416	1,212	3,771	2,179
Net income	2,292	2,220	6,655	6,290
Total comprehensive income	$ 1,506	$ 3,187	$ 9,489	$ 6,643