SELECTED QUARTERLY 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
Selected Quarterly Financial Information [Abstract]
Interest Income	$ 27,018	$ 27,603	$ 26,977	$ 27,078	$ 28,043	$ 28,376	$ 28,115	$ 28,824
Interest Expense	1,006	1,027	1,053	1,083	1,104	1,231	1,509	1,682	$ 4,169	$ 5,526	$ 8,961
NET INTEREST INCOME	26,012	26,576	25,924	25,995	26,939	27,145	26,606	27,142	104,507	107,832	107,260
Provision For Loan Losses	1,050	1,050	1,150	1,450	1,962	1,506	(356)	1,960	4,700	5,072	7,860
Net income	$ 7,114	$ 8,398	$ 6,923	$ 7,761	$ 9,181	$ 8,272	$ 8,488	$ 7,831	$ 30,196	$ 33,772	$ 31,534
Net Income Per Share (in dollars per share)	$ 0.56	$ 0.65	$ 0.54	$ 0.60	$ 0.71	$ 0.62	$ 0.63	$ 0.59	$ 2.35	$ 2.55	$ 2.37