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Banking Premises and Equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]      
Land $ 13,631 $ 12,440  
Banking premises 72,362 59,708  
Furniture, fixtures and equipment 52,128 45,660  
Leasehold improvements 37,756 35,749  
Construction in progress 9,669 3,270  
Banking premises and equipment, gross 185,546 156,827  
Less accumulated depreciation and amortization 109,600 101,617  
Banking premises and equipment, net 75,946 55,210  
Depreciation expense $ 7,600 $ 7,700 $ 8,000