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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