Quarterly Financial Data (Schedule Of Unaudited Quarterly Financial Data) (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
Quarterly Financial Data [Abstract]
Interest income	$ 34,923	$ 35,884	$ 36,490	$ 36,553	$ 36,128	$ 34,859	$ 34,946	$ 32,304	$ 143,850	$ 138,237	$ 118,265
Interest expense	10,337	10,990	11,211	11,143	9,953	9,568	9,061	7,148	43,681	35,730	21,709
Net interest income	24,586	24,894	25,279	25,410	26,175	25,291	25,885	25,156	100,169	102,507	96,556
Provision (credit) for loan losses	(246)	314	422	(457)	(2,302)	(1,768)	803	1,512	33	(1,755)	4,854
Noninterest income before net securities gains (losses)	2,716	2,720	2,717	2,444	3,979	2,735	2,679	3,292	10,597	12,685
Net gains (losses) on sales of securities	14				(5,446)	(4,960)			14	(10,406)	(1,866)
Noninterest expense	16,723	14,330	14,776	15,135	15,089	14,242	15,707	14,868	60,964	59,906	54,852
Income before income taxes	10,839	12,970	12,798	13,176	11,921	10,592	12,054	12,068	49,783	46,635	45,011
Income tax expense	1,652	2,187	2,054	2,335	1,831	535	1,739	957	8,228	5,062	9,889
Net income	$ 9,187	$ 10,783	$ 10,744	$ 10,841	$ 10,090	$ 10,057	$ 10,315	$ 11,111	$ 41,555	$ 41,573	$ 35,122
Basic	$ 0.38	$ 0.44	$ 0.43	$ 0.43	$ 0.40	$ 0.39	$ 0.41	$ 0.44	$ 1.68	$ 1.64	$ 1.44
Diluted	$ 0.38	$ 0.44	$ 0.43	$ 0.43	$ 0.39	$ 0.39	$ 0.40	$ 0.44	$ 1.67	$ 1.63	$ 1.43
Comprehensive income	$ 10,577	$ 11,246	$ 14,064	$ 15,703	$ 12,118	$ 8,952	$ 7,869	$ 2,925	$ 51,590	$ 31,864	$ 37,272