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Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Current |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 2,973 | $ 4,509 | $ 24,258
State |  |  |  |  |  |  |  |  | 5,304 | 5,547 | 5,666
Total deferred expense |  |  |  |  |  |  |  |  | 8,277 | 10,056 | 29,924
Deferred |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 13,175 | 9,702 | 14,885
State |  |  |  |  |  |  |  |  | 1,341 | (399) | 233
Total deferred expense |  |  |  |  |  |  |  |  | 14,516 | 9,303 | 15,118
Effective income tax rate | $ 7,451 | $ 8,020 | $ 2,491 | $ 4,831 | $ 5,109 | $ 28 | $ 6,820 | $ 7,402 | $ 22,793 | $ 19,359 | $ 45,042

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