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Loans and Leases (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unamortized premiums $ (29,500)   $ (33,800)
Interest receivable 284,100   270,400
Interest on non-accrual loans 10,800 $ 6,100  
Loans held for sale ($323 and $2,610 valued under fair value option) 239,763   6,541
Accrued expenses and other liabilities 1,730,116   1,603,744
Commercial non-mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 17,800    
Disposal Group, Held-for-Sale, Not Discontinued Operations | Commercial Services Business      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs, Related Assets And Liabilities To Be Sold 220,200    
Loans held for sale ($323 and $2,610 valued under fair value option) 49,700    
Collateral Pledged | FHLB | Asset Pledged as Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral 17,800,000    
Collateral Pledged | Federal Reserve Bank (FRB) | Asset Pledged as Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral 1,200,000    
Collateral Pledged | Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired financing receivable 50,000   66,100
Collateral Pledged | Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired financing receivable 23,800   22,700
Collateral Value      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired financing receivable $ 78,100   $ 93,700