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INCOME TAXES - Effective income tax rate reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
INCOME TAXES |  |  |  |
Tax at statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
Nontaxable interest and dividends | (0.50%) | (0.40%) | (0.50%) | (0.40%)
Tax credits | (2.50%) | (1.60%) | (2.30%) | (1.70%)
State taxes | 1.50% | 1.90% | 1.60% | 1.70%
Other | 0.20% | (0.40%) | 0.70% | (0.10%)
Effective income tax rate reconciliation, percent, Total | 19.70% | 20.50% | 20.50% | 20.50%
Tax obligation under tax examinations |  |  |  | $ 4.0

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