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Income Taxes - Comparison of Federal Statutory Income Tax Rates to Effective Income Tax Rates (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amount |  |  |  |  |  |  |  |  |  |  |
Statutory federal tax |  |  |  |  |  |  |  |  | $ 11,617 | $ 9,703 | $ 16,379
State franchise tax, net of federal benefit |  |  |  |  |  |  |  |  | 5,322 | 3,488 | 3,135
Tax-exempt income |  |  |  |  |  |  |  |  | (25) | (27) | (297)
Tax impact from change in tax rate |  |  |  |  |  |  |  |  | 17 | (479) | 2,591
Stock-based compensation |  |  |  |  |  |  |  |  | (27) | (2,643) |
Other items, net |  |  |  |  |  |  |  |  | (792) | 59 | (539)
Income tax expense | $ 4,149 | $ 3,689 | $ 4,415 | $ 3,859 | $ 4,188 | $ 2,041 | $ 2,292 | $ 1,580 | $ 16,112 | $ 10,101 | $ 21,269
Rate |  |  |  |  |  |  |  |  |  |  |
Statutory federal tax |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
State franchise tax, net of federal benefit |  |  |  |  |  |  |  |  | 9.60% | 7.50% | 6.70%
Tax-exempt income |  |  |  |  |  |  |  |  | (0.00%) | (0.10%) | (0.60%)
Tax impact from change in tax rate |  |  |  |  |  |  |  |  | 0.00% | (1.00%) | 5.50%
Stock-based compensation |  |  |  |  |  |  |  |  | 0.00% | (5.70%) | 0.00%
Other items, net |  |  |  |  |  |  |  |  | (1.40%) | 0.10% | (1.20%)
Actual tax expense |  |  |  |  |  |  |  |  | 29.20% | 21.80% | 45.40%

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