SELECTED QUARTERLY DATA (UNAUDITED): (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Gain on Sale of certain assets and liabilities of Insurance Brokerage Operation									$ 0	$ 0	$ 0
Interest Income	$ 43,651	$ 39,595	$ 33,259	$ 32,616	$ 32,569	$ 31,375	$ 32,903	$ 29,377
Interest Expense	5,176	5,596	3,507	3,190	2,974	2,548	2,219	1,904	17,469	9,645	6,338
NET INTEREST INCOME	38,475	33,999	29,752	29,426	29,595	28,827	30,684	27,473	131,652	116,579	107,857
Provision For Loan Losses	1,500	1,500	230	1,470	1,470	1,470	1,355	1,473	4,700	5,768	5,295
Net income	$ 14,364	$ 12,257	$ 12,569	$ 9,682	$ 11,056	$ 11,313	$ 15,261	$ 8,953	$ 48,872	$ 46,583	$ 29,131
Net Income Per Share (in dollars per share)	$ 1.06	$ 0.93	$ 1.02	$ 0.79	$ 0.90	$ 0.92	$ 1.25	$ 0.73	$ 3.80	$ 3.80	$ 2.38