Condensed Quarterly Results of Operations (Unaudited)) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Interest income	$ 27,775	$ 27,901	$ 27,788	$ 27,483	$ 27,042	$ 26,236	$ 24,883	$ 23,476	$ 110,947	$ 101,638	$ 80,924
Interest expense	2,953	3,526	3,589	3,510	2,984	2,460	2,083	1,716	13,578	9,244	5,223
Net interest income	24,822	24,375	24,199	23,973	24,058	23,776	22,800	21,760	97,369	92,394	75,701
Provision for loan and lease losses	500	1,350	400	300	1,400	2,450	300	200	2,550	4,350	(1,140)
Non-interest income	5,847	5,869	5,855	5,906	5,279	5,723	5,429	5,133	23,477	21,564	21,779
Non-interest expense	17,982	17,088	17,656	17,852	17,036	17,807	17,294	17,887	70,578	70,024	65,441
Net income before taxes	12,187	11,806	11,998	11,727	10,901	9,242	10,635	8,806	47,718	39,584	33,179
Provision for income taxes	2,902	2,854	3,169	2,832	2,997	2,171	2,643	2,096	11,757	9,907	13,640
Net income	$ 9,285	$ 8,952	$ 8,829	$ 8,895	$ 7,904	$ 7,071	$ 7,992	$ 6,710	$ 35,961	$ 29,677	$ 19,539
Diluted earnings per share	$ 0.60	$ 0.58	$ 0.57	$ 0.58	$ 0.51	$ 0.46	$ 0.52	$ 0.44	$ 2.33	$ 1.92	$ 1.36
Cash dividend per share	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.16	$ 0.16	$ 0.16	$ 0.16