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Income Taxes - Reconciliation between statutory and effective tax rate (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation between statutory U.S. federal income tax rate and effective tax rate |  |  |
Calculated tax benefit at statutory rate | 21.00% | 21.00% | 35.00%
Increase (decrease) in income taxes resulting from: |  |  |
State taxes, net of federal income tax | 5.60% | 7.00% | 6.50%
Tax exempt income | (0.50%) | (0.50%) | (0.70%)
Share-based compensation | (0.10%) | (0.90%) |
Non-deductible expenses | 0.30% | 0.50% | 0.20%
Remeasurement of net deferred tax assets |  | (1.40%) | 5.80%
Total income tax expense (benefit) | 26.30% | 25.70% | 46.80%

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