SUPPLEMENTAL DATA (unaudited) (Schedule of Unaudited Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 38,532	$ 40,174	$ 41,649	$ 45,395	$ 45,556	$ 45,948	$ 44,603	$ 44,563	$ 165,750	$ 180,670	$ 159,686
Interest expense	6,797	8,025	9,678	13,648	14,642	15,863	15,335	14,556	38,148	60,396	44,523
Net interest income before provision for loan and lease losses	31,735	32,149	31,971	31,747	30,914	30,085	29,268	30,007	127,602	120,274	115,163
Provision for loan losses	2,350	5,150	4,900	20,000	1,950	800	1,150	100	32,400	4,000	3,550
Wealth management fee income	10,791	10,119	9,996	9,955	10,120	9,501	9,568	9,174	40,861	38,363	33,245
Securities gains/(losses), net	(42)		125	198	(45)	34	69	59	281	117	(393)
Other income	3,657	10,092	2,505	4,364	5,450	4,881	3,389	2,496
Operating expenses	39,249	28,461	29,014	28,235	26,701	26,259	26,173	25,715
Income before income tax expense	4,542	18,749	10,683	(1,971)	17,788	17,442	14,971	15,921	32,003	66,122	57,720
Income tax expense	1,512	5,202	2,441	(3,344)	5,555	5,216	3,421	4,496	5,811	18,688	13,550
Net income	$ 3,030	$ 13,547	$ 8,242	$ 1,373	$ 12,233	$ 12,226	$ 11,550	$ 11,425	$ 26,192	$ 47,434	$ 44,170
EARNINGS PER SHARE
Earnings per share-basic	$ 0.16	$ 0.72	$ 0.44	$ 0.07	$ 0.64	$ 0.63	$ 0.59	$ 0.59	$ 1.39	$ 2.46	$ 2.33
Earnings per share-diluted	$ 0.16	$ 0.71	$ 0.43	$ 0.07	$ 0.64	$ 0.63	$ 0.59	$ 0.58	$ 1.37	$ 2.44	$ 2.31