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Income Taxes - Components of Pre-tax Income and Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Provision for income taxes: |  |  |  |
Currently payable |  | $ 5,064 | $ 5,736 | $ 5,621
Deferred income tax expense (benefit) |  | 86 | (1,775) | (114)
Provision for income taxes |  | 5,150 | 3,961 | 5,507
Expected tax expense, at the U.S. federal statutory income tax rate of 35% in 2016 and 2017, 21% in 2018 |  | 4,300 | 6,007 | 5,588
Changes in federal tax rate, net | $ (1,900) |  | (1,861) |
State income taxes |  | 812 | 235 | 388
Domestic production activities deduction |  |  | (505) | (495)
Other, net |  | 38 | 85 | 26
Provision for income taxes |  | $ 5,150 | $ 3,961 | $ 5,507

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