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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 46,376 | $ 40,314 | $ 87,804
Deferred |  |  |  |  |  |  |  |  | 1,916 | 8,952 | (10,142)
Federal |  |  |  |  |  |  |  |  | 48,292 | 49,266 | 77,662
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 4,557 | 4,243 | 4,991
Deferred |  |  |  |  |  |  |  |  | (330) | (116) | 31
State |  |  |  |  |  |  |  |  | 4,227 | 4,127 | 5,022
Total |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 50,933 | 44,557 | 92,795
Deferred |  |  |  |  |  |  |  |  | 1,586 | 8,836 | (10,111)
Income tax expense (benefit) | $ 12,970 | $ 11,309 | $ 13,873 | $ 14,367 | $ 15,826 | $ 13,100 | $ 15,502 | $ 8,965 | $ 52,519 | $ 53,393 | $ 82,684

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