SELECTED QUARTERLY DATA (Summary Of Selected Quarterly Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest income	$ 28,050	$ 26,970	$ 26,424	$ 26,292	$ 26,685	$ 28,660	$ 29,249	$ 29,775
Interest expense	3,752	3,998	4,512	5,035	5,819	6,500	7,101	7,278	17,297	26,698	29,812
Net interest income	24,298	22,972	21,912	21,257	20,866	22,160	22,148	22,497	90,439	87,671	92,080
Provision for loan losses	0	0	0	0	1,250	0	500	799	0	2,549	13,800
Net interest income after provision	24,298	22,972	21,912	21,257	19,616	22,160	21,648	21,698	90,439	85,122	78,280
Noninterest income	7,878	7,809	7,569	7,481	7,305	6,229	5,812	5,850
Noninterest expense	16,528	16,266	15,091	14,893	14,511	14,302	14,249	14,680	62,778	57,742	55,105
Income tax expense	5,060	4,746	5,154	4,599	3,808	4,740	4,392	4,242	19,559	17,182	14,718
Net income	$ 10,588	$ 9,769	$ 9,236	$ 9,246	$ 8,602	$ 9,347	$ 8,819	$ 8,626	$ 38,839	$ 35,394	$ 30,662
Basic earnings per common share	$ 0.64	$ 0.59	$ 0.56	$ 0.56	$ 0.53	$ 0.57	$ 0.54	$ 0.53	$ 2.36	$ 2.17	$ 1.89
Diluted earnings per common share	$ 0.63	$ 0.59	$ 0.56	$ 0.56	$ 0.52	$ 0.57	$ 0.54	$ 0.52	$ 2.33	$ 2.15	$ 1.88