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Components of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Land $ 19,155 $ 19,166
Buildings and leasehold improvements 50,776 50,729
Equipment 36,709 38,103
Property, Plant and Equipment, Gross, Total 106,640 107,998
Accumulated depreciation and amortization 53,884 52,154
Total premises and equipment, net $ 52,756 $ 55,844