SELECTED QUARTERLY DATA (UNAUDITED): (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
After Tax Gain on Sale of certain assets and liabilities of Insurance Brokerage Operation				$ 5,750
Gain on Sale of certain assets and liabilities of Insurance Brokerage Operation		$ (199)							$ 12,800	$ 12,822	$ 0	$ 0
Interest Income	$ 27,579	27,450	$ 27,150	27,201	$ 27,018	$ 27,603	$ 26,977	$ 27,078
Interest Expense	1,173	1,099	1,091	1,044	1,006	1,027	1,053	1,083		4,407	4,169	5,526
NET INTEREST INCOME	26,406	26,351	26,059	26,157	26,012	26,576	25,924	25,995		104,973	104,507	107,832
Provision For Loan Losses	939	1,091	435	835	1,050	1,050	1,150	1,450		3,300	4,700	5,072
Net income	$ 8,344	$ 8,162	$ 8,232	$ 13,675	$ 7,114	$ 8,398	$ 6,923	$ 7,761		$ 38,413	$ 30,196	$ 33,772
Net Income Per Share (in dollars per share)	$ 0.69	$ 0.67	$ 0.68	$ 1.08	$ 0.56	$ 0.65	$ 0.54	$ 0.60		$ 3.12	$ 2.35	$ 2.55