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Income Tax - Reconciliation of Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Currently payable |  |  |
Federal | $ 12,079 | $ 7,467 | $ 5,511
Deferred |  |  |
Federal | 331 | 1,334 | 1,721
Revaluation of deferred tax assets | 2,426 |  |
Total income tax expense | 14,836 | 8,801 | 7,232
Reconciliation of federal statutory to actual tax expense |  |  |
Federal statutory income tax at 35% | 16,783 | 11,450 | 9,724
Tax exempt interest | (2,699) | (1,882) | (1,708)
Tax exempt income | (638) | (575) | (488)
Stock compensation | (546) |  |
Revaluation of deferred tax assets | 2,426 |  |
Other tax exempt income | (456) | (608) | (199)
Nondeductible and other | (34) | 416 | (97)
Total income tax expense | $ 14,836 | $ 8,801 | $ 7,232

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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