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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
INCOME TAXES    
Tax at statutory rate 21.00% 21.00%
Nontaxable interest and dividends (0.30%) (0.50%)
Tax credits (1.90%) (3.50%)
State taxes 1.30% (1.70%)
Other 0.90% 0.30%
Effective income tax rate reconciliation 21.00% 15.60%