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Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total cost $ 138,443 $ 115,790
Accumulated depreciation (46,234) (41,459)
Net premise and equipment 92,209 74,331
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 27,292 21,604
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 83,669 69,590
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 27,482 $ 24,596