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Income Taxes - Components of Pre-tax Income and Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Provision for income taxes: |  |  |  |
Currently payable | $ 5,476 | $ 3,222 | $ 4,849 |
Deferred income tax expense (benefit) | (321) | (48) | 89 |
Provision for income taxes | 5,155 | 3,174 | 4,938 |
Expected tax expense, at the U.S. federal statutory income tax rate of 21% | 4,562 | 2,835 | 4,397 |
State income taxes | 692 | 378 | 742 |
Foreign-derived intangible income benefit | (120) | (55) | (201) | $ (100)
Other, net | 21 | 16 |  |
Provision for income taxes | $ 5,155 | $ 3,174 | $ 4,938 |

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