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Loans and Leases and the Allowance for Credit Losses - Summary of Loan grades applied various classes of Commercial and Real Estate Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one $ 5,267,000   $ 19,234,000
Year two 17,723,000   15,083,000
Year three 14,213,000   17,786,000
Year four 17,002,000   11,704,000
Year five 11,034,000   8,328,000
Prior 35,500,000   28,783,000
Total (a) (b) [1] 134,574,000   135,581,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 1,000    
Year two 17,000    
Year three 22,000    
Year four 20,000    
Year five 12,000    
Prior 44,000    
Total 160,000 $ 163,000  
Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 2,251,000   9,221,000
Year two 8,513,000   6,895,000
Year three 6,271,000   6,345,000
Year four 5,961,000   3,509,000
Year five 3,147,000   1,668,000
Prior 7,332,000   5,895,000
Revolving Loans 26,973,000   27,815,000
Revolving Loans Converted to Term Loans 148,000   133,000
Total (a) (b) 60,596,000   61,481,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0    
Year two 3,000    
Year three 8,000    
Year four 9,000    
Year five 2,000    
Prior 5,000    
Revolving Loans 23,000    
Revolving Loans Converted to Term Loans 0    
Total 50,000    
Commercial and industrial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 2,222,000   9,021,000
Year two 8,230,000   6,454,000
Year three 5,812,000   5,845,000
Year four 5,456,000   3,258,000
Year five 2,918,000   1,534,000
Prior 6,474,000   5,147,000
Revolving Loans 25,358,000   26,262,000
Revolving Loans Converted to Term Loans 94,000   79,000
Total (a) (b) 56,564,000   57,600,000
Commercial and industrial | Criticized accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 29,000   189,000
Year two 272,000   385,000
Year three 393,000   402,000
Year four 403,000   210,000
Year five 188,000   75,000
Prior 588,000   528,000
Revolving Loans 1,461,000   1,359,000
Revolving Loans Converted to Term Loans 36,000   37,000
Total (a) (b) 3,370,000   3,185,000
Commercial and industrial | Criticized nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 0   11,000
Year two 11,000   56,000
Year three 66,000   98,000
Year four 102,000   41,000
Year five 41,000   59,000
Prior 270,000   220,000
Revolving Loans 154,000   194,000
Revolving Loans Converted to Term Loans 18,000   17,000
Total (a) (b) 662,000   696,000
Commercial Real Estate      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Total 22,000 $ 25,000  
Commercial Real Estate | Commercial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 538,000   714,000
Year two 442,000   1,867,000
Year three 1,845,000   2,076,000
Year four 1,925,000   1,501,000
Year five 1,500,000   2,382,000
Prior 13,391,000   11,819,000
Revolving Loans 455,000   421,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 20,096,000   20,780,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0    
Year two 0    
Year three 0    
Year four 0    
Year five 0    
Prior 22,000    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 0    
Total 22,000    
Commercial Real Estate | Commercial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 538,000   674,000
Year two 402,000   1,477,000
Year three 1,492,000   1,358,000
Year four 1,310,000   1,222,000
Year five 1,196,000   1,774,000
Prior 11,051,000   9,611,000
Revolving Loans 447,000   413,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 16,436,000   16,529,000
Commercial Real Estate | Commercial | Criticized accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 0   39,000
Year two 39,000   389,000
Year three 352,000   665,000
Year four 560,000   253,000
Year five 279,000   591,000
Prior 2,029,000   1,839,000
Revolving Loans 7,000   7,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 3,266,000   3,783,000
Commercial Real Estate | Commercial | Criticized nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 0   1,000
Year two 1,000   1,000
Year three 1,000   53,000
Year four 55,000   26,000
Year five 25,000   17,000
Prior 311,000   369,000
Revolving Loans 1,000   1,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 394,000   468,000
Commercial Real Estate | Residential builder and developer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 125,000   396,000
Year two 346,000   278,000
Year three 193,000   74,000
Year four 71,000   12,000
Year five 11,000   4,000
Prior 14,000   11,000
Revolving Loans 66,000   60,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 826,000   835,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0    
Year two 0    
Year three 0    
Year four 0    
Year five 0    
Prior 0    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 0    
Total 0    
Commercial Real Estate | Residential builder and developer | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 124,000   380,000
Year two 327,000   236,000
Year three 171,000   40,000
Year four 41,000   12,000
Year five 11,000   4,000
Prior 14,000   10,000
Revolving Loans 66,000   60,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 754,000   742,000
Commercial Real Estate | Residential builder and developer | Criticized accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 1,000   15,000
Year two 18,000   42,000
Year three 22,000   34,000
Year four 30,000   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 71,000   91,000
Commercial Real Estate | Residential builder and developer | Criticized nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 0   1,000
Year two 1,000   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   1,000
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 1,000   2,000
Commercial Real Estate | Other commercial construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 4,000   150,000
Year two 167,000   1,499,000
Year three 1,534,000   1,795,000
Year four 1,727,000   648,000
Year five 523,000   472,000
Prior 945,000   540,000
Revolving Loans 45,000   45,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 4,945,000   5,149,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0    
Year two 0    
Year three 0    
Year four 0    
Year five 0    
Prior 0    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 0    
Total 0    
Commercial Real Estate | Other commercial construction | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 4,000   108,000
Year two 165,000   1,395,000
Year three 1,407,000   1,091,000
Year four 982,000   269,000
Year five 213,000   175,000
Prior 500,000   379,000
Revolving Loans 39,000   42,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 3,310,000   3,459,000
Commercial Real Estate | Other commercial construction | Criticized accrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 0   42,000
Year two 2,000   104,000
Year three 126,000   687,000
Year four 729,000   346,000
Year five 309,000   297,000
Prior 435,000   145,000
Revolving Loans 6,000   3,000
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) 1,607,000   1,624,000
Commercial Real Estate | Other commercial construction | Criticized nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
Year one 0   0
Year two 0   0
Year three 1,000   17,000
Year four 16,000   33,000
Year five 1,000   0
Prior 10,000   16,000
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total (a) (b) $ 28,000   $ 66,000
[1] Loans and leases of $2.1 billion and $1.5 billion at March 31, 2025 and December 31, 2024, respectively, were held in special purpose trusts to settle the respective obligations of asset-backed notes issued by those trusts. The outstanding balances of those asset-backed notes were included in Long-term borrowings and were $1.8 billion at March 31, 2025 and $1.2 billion at December 31, 2024.