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Premises and Equipment - Summary of Minimum Lease Payments Under Noncancelable Operating Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment Capitalized Interest Costs [Abstract]    
2021 $ 105,445  
2022 93,621  
2023 75,698  
2024 61,412  
2025 46,023  
Later years 130,475  
Total lease payments 512,674  
Less: imputed interest 45,354  
Operating lease liabilities $ 467,320 $ 488,000