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Premises and Equipment - Schedule of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Land $ 80,475 $ 81,194
Buildings 255,375 241,284
Furniture, fixtures and equipment 138,353 137,469
Total premises and equipment 474,203 459,947
Accumulated depreciation (177,515) (159,440)
Total premises and equipment, net $ 296,688 $ 300,507