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Premises and equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment    
Property, Plant and Equipment, Gross $ 929,891 $ 949,434
Less - Accumulated depreciation and amortization 559,234 574,835
Subtotal 370,657 374,599
Construction in progress 29,337 25,862
Premises and equipment, net 494,240 510,241
Land    
Property, Plant and Equipment    
Property, Plant and Equipment, Gross 94,246 109,780
Building    
Property, Plant and Equipment    
Property, Plant and Equipment, Gross $ 468,293 512,131
Building | Maximum    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 50 years  
Building | Minimum    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 10 years  
Equipment    
Property, Plant and Equipment    
Property, Plant and Equipment, Gross $ 374,192 350,014
Equipment | Maximum    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 10 years  
Equipment | Minimum    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 2 years  
Leasehold improvements    
Property, Plant and Equipment    
Property, Plant and Equipment, Gross $ 87,406 $ 87,289
Leasehold improvements | Maximum    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 10 years  
Leasehold improvements | Minimum    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 3 years