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PROPERTY PLANT AND EQUIPMENT (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]      
Buildings and Improvements $ 132,008 $ 139,533  
Leasehold Improvements 53,866 60,605  
Furniture and equipment 166,853 165,386  
Property, Plant and Equipment, Gross 352,727 365,524  
Accumulated Depreciation (245,777) (248,335)  
Subtotal 106,950 117,189  
Land 24,640 25,279  
Projects in progress 10,305 8,360  
Premises and equipment, net 141,895 150,828  
Depreciation and amortization expense $ 16,400 $ 17,600 $ 21,100
Maximum [Member] | FurnitureAndFixturesMember      
Property Plant And Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Maximum [Member] | BuildingImprovementsMember      
Property Plant And Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 35 years    
Maximum [Member] | LeaseholdImprovementsMember      
Property Plant And Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Minimum [Member] | FurnitureAndFixturesMember      
Property Plant And Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Minimum [Member] | BuildingImprovementsMember      
Property Plant And Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Minimum [Member] | LeaseholdImprovementsMember      
Property Plant And Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 1 year