SELECTED QUARTERLY DATA (UNAUDITED) (Schedule of Quarterly Financial Information) (Detail) (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	$ 15,132	$ 15,034	$ 14,880	$ 14,866	$ 15,742	$ 15,433	$ 15,661	$ 15,688	$ 59,912	$ 62,524	$ 64,798
Interest Expense	1,091	1,112	1,172	1,283	1,410	1,471	1,614	1,844	4,658	6,339	9,260
Net Interest Income	14,041	13,922	13,708	13,583	14,332	13,962	14,047	13,844	55,254	56,185	55,538
Provision for Loan Losses	500	600	1,600	2,000	1,300	2,200	1,700	1,800	4,700	7,000	10,750
Net income	$ 5,775	$ 5,415	$ 4,485	$ 4,090	$ 5,010	$ 4,196	$ 4,424	$ 4,515	$ 19,765	$ 18,145	$ 16,489
Earnings Per Common Share Basic	$ 0.76	$ 0.72	$ 0.60	$ 0.55	$ 0.67	$ 0.56	$ 0.59	$ 0.61	$ 2.63	$ 2.43	$ 2.09
Earnings Per Common Share Diluted	$ 0.76	$ 0.72	$ 0.59	$ 0.54	$ 0.66	$ 0.56	$ 0.59	$ 0.60	$ 2.61	$ 2.41	$ 2.07