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Income Taxes - schedule of effective income tax rate reconciliation (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes      
Tax at statutory rate 21.00% 21.00% 21.00%
Nontaxable interest and dividends (0.50%) (0.30%) (0.50%)
Tax credits (1.60%) (1.80%) (3.80%)
State taxes 1.80% 1.30% 1.40%
Deferred tax rate change benefit (0.60%)    
Other (0.70%) 0.70% 0.80%
Effective Income Tax Rate Reconciliation, Percent, Total 19.40% 20.90% 18.90%