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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, Net, by Type [Abstract]    
Land and land improvements $ 29,453 $ 29,065
Buildings 65,241 64,478
Furniture and equipment 45,723 45,228
Premises and equipment, gross 140,417 138,771
Less: Accumulated depreciation (53,704) (50,125)
Premises and equipment less depreciation, gross 86,713 88,646
Construction in progress 373 701
Total premises and equipment $ 87,086 $ 89,347