SELECTED QUARTERLY DATA (Summary Of Selected Quarterly Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income	$ 36,307	$ 35,079	$ 34,355	$ 33,210	$ 31,619	$ 30,966	$ 30,290	$ 29,664
Interest expense	5,400	5,360	5,082	4,628	4,167	4,255	4,226	3,964	$ 20,470	$ 16,612	$ 14,985
Net interest income	30,907	29,719	29,273	28,582	27,452	26,711	26,064	25,700	118,481	105,927	102,303
Provision for loan losses	1,150	0	0	0	0	0	0	0	1,150	0	0
Net interest income after provision	29,757	29,719	29,273	28,582	27,452	26,711	26,064	25,700	117,331	105,927	102,303
Noninterest income	8,736	9,018	8,067	7,043	8,069	7,902	7,713	7,795
Noninterest expense	18,389	18,759	18,446	17,384	17,357	17,207	16,741	16,901	72,978	68,206	66,166
Income tax expense	6,582	6,498	6,091	5,962	5,878	5,841	5,656	5,458	25,133	22,833	22,385
Net income	$ 13,522	$ 13,480	$ 12,803	$ 12,279	$ 12,286	$ 11,565	$ 11,380	$ 11,136	$ 52,084	$ 46,367	$ 43,805
Basic earnings per common share	$ 0.54	$ 0.54	$ 0.51	$ 0.49	$ 0.49	$ 0.46	$ 0.46	$ 0.45	$ 2.08	$ 1.86	$ 1.77
Diluted earnings per common share	$ 0.53	$ 0.53	$ 0.5	$ 0.48	$ 0.49	$ 0.46	$ 0.45	$ 0.44	$ 2.05	$ 1.84	$ 1.74