QUARTERLY FINANCIAL 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	Mar. 31, 2015	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
QUARTERLY FINANCIAL DATA (UNAUDITED)
Interest Income	$ 34,854	$ 33,857	$ 30,870	$ 28,746	$ 28,437	$ 28,113	$ 27,267	$ 27,293	$ 128,327	$ 111,110	$ 103,095
Net Interest Income	32,041	30,990	28,198	26,372	26,239	26,088	25,054	25,344	117,601	102,725	94,488
Net Income	$ 11,744	$ 11,696	$ 6,117	$ 8,766	$ 9,108	$ 9,111	$ 7,663	$ 9,660	$ 38,323	$ 35,542	$ 28,996
Earnings per Common Share
Basic	$ 0.49	$ 0.49	$ 0.27	$ 0.41	$ 0.42	$ 0.42	$ 0.35	$ 0.45	$ 1.66	$ 1.64	$ 1.40
Net income attributable to common shareholders and assumed conversions (in dollars per share)	$ 0.48	$ 0.48	$ 0.27	$ 0.40	$ 0.42	$ 0.42	$ 0.35	$ 0.44	$ 1.64	$ 1.62	$ 1.39