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Income Taxes - Reconciliation between statutory and effective tax rate (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation between statutory U.S. federal income tax rate and effective tax rate |  |  |
Calculated tax expense at statutory rate | 21.00% | 21.00% | 21.00%
Increase (decrease) in income taxes resulting from: |  |  |
State taxes, net of federal income tax | 5.30% | 5.40% | 4.80%
Tax exempt income | (0.80%) | (0.80%) | (1.00%)
Share-based compensation | (0.80%) | (0.20%) | (1.70%)
Non-deductible expenses | 0.30% | 0.50% | 0.20%
Total income tax expense | 25.00% | 25.90% | 23.30%

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