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Premises and Equipment (Premises and Equipment) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Land $ 106,505 $ 111,925
Buildings 361,573 365,051
Furniture and equipment 167,723 136,983
Leasehold improvements 67,540 64,446
Construction in progress 19,508 81,991
Premises and equipment, Gross 722,849 760,396
Less accumulated depreciation and amortization (197,028) (201,272)
Total premises and equipment, net $ 525,821 $ 559,124