QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
QUARTERLY FINANCIAL DATA (UNAUDITED)
Interest Income	$ 28,437	$ 28,113	$ 27,293	$ 27,267	$ 27,163	$ 25,128	$ 25,320	$ 25,484	$ 111,110	$ 103,095	$ 101,279
Net Interest Income	26,239	26,088	25,344	25,054	24,917	23,089	23,217	23,265	102,725	94,488	91,300
Net Income	$ 9,108	$ 9,111	$ 9,660	$ 7,663	$ 6,560	$ 8,457	$ 7,754	$ 6,225	$ 35,542	$ 28,996	$ 26,345
Earnings per Common Share
Basic	$ 0.42	$ 0.42	$ 0.45	$ 0.35	$ 0.31	$ 0.41	$ 0.38	$ 0.30	$ 1.64	$ 1.40	$ 1.26
Diluted (in dollars per share)	$ 0.42	$ 0.42	$ 0.44	$ 0.35	$ 0.30	$ 0.41	$ 0.38	$ 0.30	$ 1.62	$ 1.39	$ 1.26