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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