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Income Tax - Reconciliation of Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Currently payable |  |  |
Federal | $ 11,143 | $ 9,166 | $ 12,079
State | 140 |  |
Deferred |  |  |
Federal | 1,787 | 1,277 | 331
State | 233 |  |
Revaluation of deferred tax assets |  |  | 2,426
Total income tax expense | 13,303 | 10,443 | 14,836
Reconciliation of federal statutory to actual tax expense |  |  |
Federal statutory income tax at 21% in 2019 and 2018 35% in 2017 | 16,767 | 13,348 | 16,783
Tax exempt interest | (2,977) | (1,982) | (2,699)
Tax exempt income | (587) | (448) | (638)
Stock compensation | (324) | (384) | (546)
Revaluation of deferred tax assets |  |  | 2,426
Other tax exempt income | (313) | (260) | (456)
State tax | 295 |  |
Nondeductible and other | 442 | 169 | (34)
Total income tax expense | $ 13,303 | $ 10,443 | $ 14,836

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