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Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total cost $ 99,604 $ 90,518
Accumulated depreciation (33,247) (29,720)
Net premise and equipment 66,357 60,798
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 20,032 19,475
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 59,607 55,341
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 19,965 $ 15,702