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Note Premises and equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment    
Property, Plant and Equipment, Gross $ 936,951 $ 895,844
Less - Accumulated depreciation and amortization 533,930 512,094
Subtotal 403,021 383,750
Construction in progress 32,334 30,777
Premises and equipment, net 555,874 535,046
Total premises and equipment, net 569,808 547,142
Land    
Property, Plant and Equipment    
Property, Plant and Equipment, Gross 120,519 120,519
Building    
Property, Plant and Equipment    
Property, Plant and Equipment, Gross $ 515,985 498,208
Building | Maximum    
Property, Plant and Equipment    
Useful life in years 50 years  
Building | Minimum    
Property, Plant and Equipment    
Useful life in years 10 years  
Equipment    
Property, Plant and Equipment    
Property, Plant and Equipment, Gross $ 336,722 319,394
Equipment | Maximum    
Property, Plant and Equipment    
Useful life in years 10 years  
Equipment | Minimum    
Property, Plant and Equipment    
Useful life in years 2 years  
Leasehold improvements    
Property, Plant and Equipment    
Property, Plant and Equipment, Gross $ 84,244 78,242
Leasehold improvements | Maximum    
Property, Plant and Equipment    
Useful life in years 10 years  
Leasehold improvements | Minimum    
Property, Plant and Equipment    
Useful life in years 3 years  
Buildings under capital leases    
Property, Plant and Equipment    
Other premises and equipment $ 28,264 24,903
Less - Accumulated amortization 14,330 12,807
Other premises and equipment, net $ 13,934 $ 12,096
Buildings under capital leases | Maximum    
Property, Plant and Equipment    
Useful life in years 20 years  
Buildings under capital leases | Minimum    
Property, Plant and Equipment    
Useful life in years 7 years