INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
INCOME TAXES
Tax at statutory rate	21.00%	21.00%	21.00%	21.00%
Nontaxable interest and dividends	(0.40%)	(0.30%)	(0.40%)	(0.30%)
Tax credits	(1.60%)	(1.50%)	(1.70%)	(1.70%)
State taxes	1.90%	1.90%	1.70%	1.60%
Other	(0.40%)	(0.30%)	(0.10%)	0.30%
Effective income tax rate reconciliation	20.50%	20.80%	20.50%	20.90%
Tax obligation under tax examinations			$ 4.0