INCOME TAXES (Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal income tax statutory rate	21.00%	21.00%	21.00%
Increase (decrease) in tax rate due to:
Tax-exempt interest	(3.00%)	(4.40%)	(2.20%)
Investment in life insurance	(0.40%)	(0.90%)	(0.50%)
State income taxes, net of federal tax offset	2.20%	2.50%	2.00%
Tax credits	(1.50%)	(2.60%)	(1.20%)
Merger and acquisition costs	0.00%	0.00%	0.10%
State audits and amended returns	0.00%	0.00%	(0.50%)
Low income housing partnerships, net of amortization	1.10%	1.60%	0.70%
Other	(0.90%)	1.40%	0.70%
Effective income tax rate	18.50%	18.60%	20.10%