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Income Taxes - Reconciliation between applicable income taxes and statutory federal tax rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Tax amount |  |  |  |
Taxes at statutory federal income tax rate | $ 3,168 | $ 2,356 | $ 4,596 | $ 4,132
Tax effect of tax exempt income | (127) | (108) | (247) | (222)
Tax effect of other | 572 | 621 | 701 | 983
Total income tax expense | $ 3,613 | $ 2,869 | $ 5,050 | $ 4,893
Percentage of pretax income |  |  |  |
Taxes at statutory federal income tax rate (as percentage) | 21.00% | 21.00% | 21.00% | 21.00%
Tax effect of tax exempt income (as percentage) | (0.80%) | (1.00%) | (1.10%) | (1.10%)
Tax effect of other (as percentage) | 3.80% | 5.40% | 3.20% | 5.00%
Applicable income taxes (as percentage) | 23.90% | 25.60% | 23.10% | 24.90%

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