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Income Taxes - Effective income tax rate reconciliation (Details)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
INCOME TAXES      
Tax at statutory rate 21.00% 21.00% 21.00%
Nontaxable interest and dividends (0.50%) (0.50%) (0.50%)
Tax credits (4.40%) (2.70%) (1.60%)
State taxes 1.70% 1.70% 1.80%
Deferred tax rate change benefit     (0.60%)
Other 0.30% 1.10% (0.70%)
Effective income tax rate reconciliation, percent, Total 18.10% 20.60% 19.40%