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INCOME TAXES - Effective income tax rate reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
INCOME TAXES |  |  |  |
Tax at statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
Nontaxable interest and dividends | (0.50%) | (0.60%) | (0.50%) | (0.50%)
Tax credits | (2.80%) | (1.70%) | (2.50%) | (1.70%)
State taxes | 2.50% | 1.60% | 1.90% | 1.70%
Other | 1.30% | 0.20% | 0.90% |
Effective income tax rate reconciliation, percent, Total | 21.50% | 20.50% | 20.80% | 20.50%
Tax obligation under tax examinations |  |  |  | $ 4.0

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