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Loans - Summary of Loan Portfolio by Category (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Deferred fees $ 0 $ 9,143  
Allowance for credit loss 228,804 47,576 $ 39,539
Net loans and leases 8,795,935 8,424,464  
Reverse mortgage, fair value 10,100 16,600 16,500
Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 774,455 1,016,500  
Allowance for credit loss 6,893 1,381 1,428
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,165,917 1,128,731  
Allowance for credit loss 18,160 7,387 8,325
Financing Receivable Portfolio Segment, Including Reverse Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 9,024,739 8,481,183  
Commercial and industrial(1) | Total Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,700,418 2,046,798  
Allowance for credit loss 150,875 22,849 14,211
Owner-occupied commercial | Total Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,332,727 1,296,466  
Allowance for credit loss 9,615 4,616 5,057
Commercial mortgages | Total Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,086,062 2,222,976  
Allowance for credit loss 31,071 7,452 6,806
Construction | Total Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 716,275 581,082  
Allowance for credit loss 12,190 3,891 $ 3,712
Commercial small business leases | Total Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 248,885 $ 188,630  
Paycheck Protection Program, CARES Act | Total Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 751,200