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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
INCOME TAXES |  |  |  |
Tax at statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
Nontaxable interest and dividends | (0.30%) | (0.50%) | (0.30%) | (0.50%)
Tax credits | (1.50%) | (4.30%) | (1.70%) | (3.90%)
State taxes | 1.90% | 1.50% | 1.60% | (0.20%)
Other | (0.30%) | 1.60% | 0.30% | 1.00%
Effective income tax rate reconciliation | 20.80% | 19.30% | 20.90% | 17.40%
Tax obligation under tax examinations |  |  | $ 4.0 |

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