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Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 29,478 | $ 2,973 | $ 4,509
State |  |  |  |  |  |  |  |  | 10,220 | 5,304 | 5,547
Total deferred expense |  |  |  |  |  |  |  |  | 39,698 | 8,277 | 10,056
Deferred |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 2,880 | 13,175 | 9,702
State |  |  |  |  |  |  |  |  | 802 | 1,341 | (399)
Total deferred expense |  |  |  |  |  |  |  |  | 3,682 | 14,516 | 9,303
Income tax expense | $ 22,225 | $ 12,201 | $ 7,048 | $ 1,906 | $ 7,451 | $ 8,020 | $ 2,491 | $ 4,831 | $ 43,380 | $ 22,793 | $ 19,359

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