SELECTED QUARTERLY DATA (UNAUDITED) (Summary Of Selected Quarterly Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Selected Quarterly Financial Information [Abstract]
Interest income	$ 48,322	$ 49,295	$ 47,625	$ 47,977	$ 49,854	$ 45,979	$ 46,831	$ 50,439	$ 193,219	$ 193,103	$ 215,210
Interest expense	3,315	3,554	3,964	4,298	5,141	6,066	7,303	11,585	15,131	30,095	60,163
NET INTEREST INCOME	45,007	45,741	43,661	43,679	44,713	39,913	39,528	38,854	178,088	163,008	155,047
Provision for credit losses	0	1,300	(1,700)	1,477	920	1,750	5,500	6,600	1,077	14,770	3,235
CREDIT LOSSES	45,007	44,441	45,361	42,202	43,793	38,163	34,028	32,254	177,011	148,238	151,812
Noninterest income	9,709	11,114	11,340	12,557	11,782	13,115	11,169	10,777
Noninterest expense	24,926	25,967	26,648	26,746	24,912	23,125	21,079	22,089	104,287	91,205	89,424
Income tax expense	5,507	5,469	5,705	5,030	6,071	5,377	4,448	3,643	21,711	19,539	20,338
NET INCOME	$ 24,283	$ 24,119	$ 24,348	$ 22,983	$ 24,592	$ 22,776	$ 19,670	$ 17,299	$ 95,733	$ 84,337	$ 87,047
Basic earnings per common share (in USD per share)	$ 0.95	$ 0.95	$ 0.96	$ 0.90	$ 0.97	$ 0.89	$ 0.77	$ 0.68	$ 3.76	$ 3.31	$ 3.40
Diluted earnings per common share (in USD per share)	$ 0.95	$ 0.94	$ 0.95	$ 0.90	$ 0.97	$ 0.89	$ 0.77	$ 0.67	$ 3.74	$ 3.30	$ 3.38