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Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total cost $ 115,790 $ 112,368
Accumulated depreciation (41,459) (36,839)
Net premise and equipment 74,331 75,529
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 21,604 21,633
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 69,590 68,447
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 24,596 $ 22,288