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Premises and Equipment - Schedule of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Land $ 13,119 $ 8,425
Bank premises 62,154 48,251
Furniture and equipment 28,759 36,265
Premises and equipment, gross 104,032 92,941
Accumulated depreciation and amortization (61,946) (61,559)
Premises and equipment, net $ 42,086 $ 31,382