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Allowance for Credit Losses and Credit Quality - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit loss $ 526,554 $ 428,571 $ 549,181 $ 116,580
Percentage of allowance for credit loss to total loans and leases 1.45%   1.59%  
Commitments to lend additional funds $ 1,300   $ 2,600  
Other real estate owned and repossessed and returned assets, write down 816 $ 842    
Loans and leases 36,221,019   34,466,408  
Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans and leases 25,694,668   23,942,201  
Commercial | Commercial and industrial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans and leases 12,856,701   11,422,383  
PPP Loan | Commercial | Commercial and industrial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans and leases $ 1,900,000   $ 1,600,000