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Income Taxes - Reconciliation of income taxes (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
Statutory federal income tax rate 21.00% 21.00% 21.00%
Increase (decrease) due to:      
State income taxes 3.28% 5.45% 5.04%
Non-deductible fines and penalties 2.54% 0.00% 0.00%
Tax-exempt interest and dividend income (1.57%) (0.91%) (0.75%)
Stock-based compensation expense 0.19% 0.44% 0.25%
Other 0.26% (0.32%) (0.63%)
Effective tax rate 25.70% 25.66% 24.91%