Quarterly Financial Information (Schedule of Quarterly Financial Information) (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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information [Abstract]
Interest income	$ 9,949	$ 10,008	$ 9,657	$ 9,655	$ 9,624	$ 9,028	$ 8,535	$ 8,143	$ 7,916	$ 7,928	$ 7,854	$ 7,366	$ 39,269	$ 35,330	$ 31,064
Interest expense	(1,938)	(2,008)	(1,863)	(1,745)	(1,660)	(1,317)	(1,012)	(884)	(866)	(882)	(787)	(688)	(7,554)	(4,873)	(3,223)
Net interest income	8,011	8,000	7,794	7,910	7,964	7,711	7,523	7,259	7,050	7,046	7,067	6,678	31,715	30,457	27,841
Provision for loan losses	(255)	(320)	(255)	(255)	(325)	(400)	(425)	(300)	(525)	(375)	(225)	(325)	(1,085)	(1,450)	(1,450)
Gain (loss) on write-down/sale of investment securities	20	(2)		(4)		5	107	(58)	(147)				14	54	(147)
Other income	2,595	2,634	2,489	2,461	2,263	2,278	2,264	2,341	2,029	2,248	2,131	2,105	10,179	9,146	8,513
Other expenses	(7,073)	(6,643)	(6,435)	(6,770)	(6,530)	(6,172)	(6,162)	(6,208)	(6,953)	(6,035)	(6,051)	(5,797)	(26,921)	(25,072)	(24,836)
Income before taxes	3,298	3,669	3,593	3,342	3,372	3,422	3,307	3,034	1,455	2,884	2,922	2,661	13,902	13,135	9,922
Provision for income taxes	(584)	(611)	(591)	(540)	(525)	(559)	(539)	(506)	872	(658)	(739)	(681)	(2,326)	(2,129)	(1,206)
Net income	$ 2,714	$ 3,058	$ 3,002	$ 2,802	$ 2,847	$ 2,863	$ 2,768	$ 2,528	$ 2,327	$ 2,226	$ 2,183	$ 1,980	$ 11,576	$ 11,006	$ 8,716
Net income per share - basic	$ 0.71	$ 0.82	$ 0.79	$ 0.74	$ 0.76	$ 0.76	$ 0.74	$ 0.67	$ 0.63	$ 0.60	$ 0.59	$ 0.53	$ 3.06	$ 2.93	$ 2.35
Net income per share - diluted	$ 0.71	$ 0.80	$ 0.79	$ 0.73	$ 0.75	$ 0.75	$ 0.73	$ 0.67	$ 0.61	$ 0.60	$ 0.59	$ 0.53	$ 3.03	$ 2.90	$ 2.33