INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
INCOME TAXES
Tax at statutory rate	21.00%	21.00%
Nontaxable interest and dividends	(0.40%)	(0.30%)
Tax credits	(1.70%)	(1.90%)
State taxes	1.50%	1.30%
Other	0.10%	0.90%
Effective income tax rate reconciliation	20.50%	21.00%
Tax obligation under tax examinations	$ 4.0