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Premises and Equipment - Schedule of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Land $ 8,425 $ 8,425
Bank premises 48,251 48,481
Furniture and equipment 36,265 39,272
Premises and equipment, gross 92,941 96,178
Accumulated depreciation and amortization (61,559) (62,587)
Premises and equipment, net $ 31,382 $ 33,591