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Income Taxes - Components of Federal Corporate Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Current income tax expense | $ 30,634 | $ 28,316 | $ 25,317
Deferred income tax expense | (1,849) | 789 | 2,625
Income tax expense | $ 28,785 | $ 29,105 | $ 27,942

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