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Banking Premises and Equipment (Detail)
$ in Thousands
12 Months Ended
Dec. 13, 2017
USD ($)
office
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Abstract]        
Land   $ 12,440 $ 17,594  
Banking premises   58,523 81,067  
Furniture, fixtures and equipment   45,184 43,860  
Leasehold improvements   35,240 35,455  
Construction in progress   1,036 1,103  
Banking premises and equipment, gross   152,423 179,079  
Less accumulated depreciation and amortization   89,238 94,987  
Banking premises and equipment, net   63,185 84,092  
Sale Leaseback Transaction [Line Items]        
Depreciation expense   $ 9,000 $ 9,400 $ 9,600
New Jersey Banking Offices [Member]        
Sale Leaseback Transaction [Line Items]        
Number of offices | office 12      
Net book value $ 14,500      
Net proceeds 20,700      
Deferred gain $ 6,200      
Lease term 10 years