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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income	$ 26,685	$ 28,660	$ 29,249	$ 29,775	$ 30,163	$ 30,431	$ 30,548	$ 30,750
Interest expense	5,819	6,500	7,101	7,278	7,383	7,610	7,603	7,216	26,698	29,812	30,872
NET INTEREST INCOME	20,866	22,160	22,148	22,497	22,780	22,821	22,945	23,534	87,671	92,080	92,653
Provision for loan losses	1,250	0	500	799	2,900	2,400	2,900	5,600	2,549	13,800	23,947
Net interest income after provision	19,616	22,160	21,648	21,698	19,880	20,421	20,045	17,934	85,122	78,280	68,706
Noninterest income	7,305	6,229	5,812	5,850	5,538	5,923	5,918	4,826
Noninterest expense	14,511	14,302	14,249	14,680	13,485	13,479	13,973	14,168	57,742	55,105	53,435
Income tax expense	3,808	4,740	4,392	4,242	3,672	4,418	4,001	2,627	17,182	14,718	12,237
NET INCOME	$ 8,602	$ 9,347	$ 8,819	$ 8,626	$ 8,261	$ 8,447	$ 7,989	$ 5,965	$ 35,394	$ 30,662	$ 24,543
BASIC EARNINGS PER COMMON SHARE	$ 0.53	$ 0.57	$ 0.54	$ 0.53	$ 0.51	$ 0.52	$ 0.49	$ 0.37	$ 2.17	$ 1.89	$ 1.32
DILUTED EARNINGS PER COMMON SHARE	$ 0.52	$ 0.57	$ 0.54	$ 0.52	$ 0.50	$ 0.52	$ 0.49	$ 0.37	$ 2.15	$ 1.88	$ 1.32