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Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total cost $ 112,368 $ 99,604
Accumulated depreciation (36,839) (33,247)
Net premise and equipment 75,529 66,357
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 21,633 20,032
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 68,447 59,607
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 22,288 $ 19,965