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Components of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Land $ 18,987 $ 19,155
Buildings and leasehold improvements 46,740 50,776
Equipment 32,519 36,709
Total premises and equipment 98,246 106,640
Accumulated depreciation and amortization (48,161) (53,884)
Total premises and equipment, net $ 50,085 $ 52,756