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Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($)
$ in Thousands
Jul. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]      
Loans and leases   $ 51,626,048 $ 49,764,426
90 or More Days Past Due and Accruing   29 726
Non-accrual   215,243 197,441
Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   266,590 270,835
30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   20,089 32,379
60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   31,229 40,289
Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   51,359,458 49,493,591
Commercial Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Loans and leases   41,878,482 40,103,951
90 or More Days Past Due and Accruing   28 713
Non-accrual   162,208 143,945
Commercial Portfolio Segment [Member] | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   196,299 196,771
Commercial Portfolio Segment [Member] | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   7,782 17,812
Commercial Portfolio Segment [Member] | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   26,281 34,301
Commercial Portfolio Segment [Member] | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   41,682,183 39,907,180
Loans that had either reached contractual maturity or experienced administrative delays   22,600  
Commercial Portfolio Segment [Member] | Current | Subsequent Event      
Financing Receivable, Past Due [Line Items]      
Loans that had either reached contractual maturity or experienced administrative delays, resolved $ 19,000    
Commercial Portfolio Segment [Member] | Commercial non-mortgage      
Financing Receivable, Past Due [Line Items]      
Loans and leases   17,255,036 16,392,795
90 or More Days Past Due and Accruing   0 645
Non-accrual   95,332 71,884
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   122,546 81,784
Commercial Portfolio Segment [Member] | Commercial non-mortgage | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   2,550 8,434
Commercial Portfolio Segment [Member] | Commercial non-mortgage | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   24,664 821
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   17,132,490 16,311,011
Commercial Portfolio Segment [Member] | Asset-based      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,718,251 1,821,642
90 or More Days Past Due and Accruing   0 0
Non-accrual   9,428 20,024
Commercial Portfolio Segment [Member] | Asset-based | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   9,428 25,945
Commercial Portfolio Segment [Member] | Asset-based | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   0 5,921
Commercial Portfolio Segment [Member] | Asset-based | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   0 0
Commercial Portfolio Segment [Member] | Asset-based | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,708,823 1,795,697
Commercial Portfolio Segment [Member] | Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Loans and leases   13,542,251 12,997,163
90 or More Days Past Due and Accruing   0 68
Non-accrual   40,272 39,057
Commercial Portfolio Segment [Member] | Commercial real estate | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   41,271 64,111
Commercial Portfolio Segment [Member] | Commercial real estate | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   750 1,494
Commercial Portfolio Segment [Member] | Commercial real estate | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   249 23,492
Commercial Portfolio Segment [Member] | Commercial real estate | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   13,500,980 12,933,052
Commercial Portfolio Segment [Member] | Multi-family      
Financing Receivable, Past Due [Line Items]      
Loans and leases   7,118,820 6,621,982
90 or More Days Past Due and Accruing   0 0
Non-accrual   5,823 636
Commercial Portfolio Segment [Member] | Multi-family | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   6,846 1,793
Commercial Portfolio Segment [Member] | Multi-family | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,023 1,157
Commercial Portfolio Segment [Member] | Multi-family | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   0 0
Commercial Portfolio Segment [Member] | Multi-family | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   7,111,974 6,620,189
Commercial Portfolio Segment [Member] | Equipment financing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,535,564 1,628,393
90 or More Days Past Due and Accruing   28 0
Non-accrual   11,353 12,344
Commercial Portfolio Segment [Member] | Equipment financing | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   16,208 23,138
Commercial Portfolio Segment [Member] | Equipment financing | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   3,459 806
Commercial Portfolio Segment [Member] | Equipment financing | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,368 9,988
Commercial Portfolio Segment [Member] | Equipment financing | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,519,356 1,605,255
Commercial Portfolio Segment [Member] | Warehouse lending      
Financing Receivable, Past Due [Line Items]      
Loans and leases   708,560 641,976
90 or More Days Past Due and Accruing   0 0
Non-accrual   0 0
Commercial Portfolio Segment [Member] | Warehouse lending | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   0 0
Commercial Portfolio Segment [Member] | Warehouse lending | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   0 0
Commercial Portfolio Segment [Member] | Warehouse lending | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   0 0
Commercial Portfolio Segment [Member] | Warehouse lending | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   708,560 641,976
Consumer Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Loans and leases   9,747,566 9,660,475
90 or More Days Past Due and Accruing   1 13
Non-accrual   53,035 53,496
Consumer Portfolio Segment [Member] | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   70,291 74,064
Consumer Portfolio Segment [Member] | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   12,307 14,567
Consumer Portfolio Segment [Member] | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   4,948 5,988
Consumer Portfolio Segment [Member] | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   9,677,275 9,586,411
Consumer Portfolio Segment [Member] | Residential      
Financing Receivable, Past Due [Line Items]      
Loans and leases   8,140,182 7,963,420
90 or More Days Past Due and Accruing   0 0
Non-accrual   26,750 25,424
Consumer Portfolio Segment [Member] | Residential | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   37,264 36,753
Consumer Portfolio Segment [Member] | Residential | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   8,596 8,246
Consumer Portfolio Segment [Member] | Residential | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,918 3,083
Consumer Portfolio Segment [Member] | Residential | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   8,102,918 7,926,667
Consumer Portfolio Segment [Member] | Home equity      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,552,850 1,633,107
90 or More Days Past Due and Accruing   0 0
Non-accrual   26,213 27,924
Consumer Portfolio Segment [Member] | Home equity | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   32,444 36,037
Consumer Portfolio Segment [Member] | Home equity | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   3,305 5,293
Consumer Portfolio Segment [Member] | Home equity | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   2,926 2,820
Consumer Portfolio Segment [Member] | Home equity | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   1,520,406 1,597,070
Consumer Portfolio Segment [Member] | Other consumer      
Financing Receivable, Past Due [Line Items]      
Loans and leases   54,534 63,948
90 or More Days Past Due and Accruing   1 13
Non-accrual   72 148
Consumer Portfolio Segment [Member] | Other consumer | Total Past Due and Non-accrual      
Financing Receivable, Past Due [Line Items]      
Loans and leases   583 1,274
Consumer Portfolio Segment [Member] | Other consumer | 30-59 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   406 1,028
Consumer Portfolio Segment [Member] | Other consumer | 60-89 Days Past Due and Accruing      
Financing Receivable, Past Due [Line Items]      
Loans and leases   104 85
Consumer Portfolio Segment [Member] | Other consumer | Current      
Financing Receivable, Past Due [Line Items]      
Loans and leases   $ 53,951 $ 62,674