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Premises and Equipment - Schedule of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Land $ 19,929 $ 14,489
Bank premises 73,188 65,215
Furniture and equipment 29,020 25,610
Premises and equipment, gross 122,137 105,314
Accumulated depreciation and amortization (63,944) (59,148)
Premises and equipment, net $ 58,193 $ 46,166