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Income Tax - Reconciliation of Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Currently payable |  |  |
Federal | $ 9,166 | $ 12,079 | $ 7,467
Deferred |  |  |
Federal | 1,277 | 331 | 1,334
Revaluation of deferred tax assets |  | 2,426 |
Total income tax expense | 10,443 | 14,836 | 8,801
Reconciliation of federal statutory to actual tax expense |  |  |
Federal statutory income tax at 21% in 2018 and 35% in 2017 and 2016 | 13,348 | 16,783 | 11,450
Tax exempt interest | (1,982) | (2,699) | (1,882)
Tax exempt income | (448) | (638) | (575)
Stock compensation | (384) | (546) |
Revaluation of deferred tax assets |  | 2,426 |
Other tax exempt income | (260) | (456) | (608)
Nondeductible and other | 169 | (34) | 416
Total income tax expense | $ 10,443 | $ 14,836 | $ 8,801

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