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Income Taxes - Reconciliation between applicable income taxes and statutory federal tax rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Tax amount |  |  |
Taxes at statutory federal income tax rate | $ 10,958 | $ 14,506 | $ 12,289
Tax exempt income | (514) | (556) | (527)
State income taxes, net of federal benefits | 2,297 | 2,973 | 2,522
Nondeductible items and other | (564) | (527) | (441)
Applicable income taxes | $ 12,177 | $ 16,396 | $ 13,843
Percentage of pretax income |  |  |
Taxes at statutory federal income tax rate (as percentage) | 21.00% | 21.00% | 21.00%
Tax exempt income (as percentage) | (1.00%) | (0.80%) | (0.90%)
State income taxes, net of federal benefits (as percentage) | 4.40% | 4.30% | 4.30%
Nondeductible items and other (as percentage) | (1.10%) | (0.80%) | (0.80%)
Applicable income taxes (as percentage) | 23.30% | 23.70% | 23.60%

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