Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 51,098,642	$ 50,726,052
90 or More Days Past Due and Accruing	12,487	278
Non-accrual	282,841	208,525
Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	408,254	255,511
30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	73,869	33,873
60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	39,057	12,835
Current
Financing Receivable, Past Due [Line Items]
Loans and leases	50,690,388	50,470,541
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	41,338,516	40,929,834
90 or More Days Past Due and Accruing	12,487	278
Non-accrual	251,118	179,134
Commercial Portfolio Segment [Member] | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	352,003	195,543
Commercial Portfolio Segment [Member] | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	59,153	12,893
Commercial Portfolio Segment [Member] | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	29,245	3,238
Commercial Portfolio Segment [Member] | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	40,986,513	40,734,291
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	16,696,070	16,885,475
90 or More Days Past Due and Accruing	35	94
Non-accrual	193,294	122,855
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	199,544	126,109
Commercial Portfolio Segment [Member] | Commercial non-mortgage | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,077	2,270
Commercial Portfolio Segment [Member] | Commercial non-mortgage | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,138	890
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	16,496,526	16,759,366
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Past Due [Line Items]
Loans and leases	1,492,886	1,557,841
90 or More Days Past Due and Accruing	0	0
Non-accrual	34,893	35,068
Commercial Portfolio Segment [Member] | Asset-based | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	34,893	35,068
Commercial Portfolio Segment [Member] | Asset-based | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
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	1,457,993	1,522,773
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	13,972,916	13,569,762
90 or More Days Past Due and Accruing	12,452	184
Non-accrual	3,815	11,383
Commercial Portfolio Segment [Member] | Commercial real estate | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	45,121	13,026
Commercial Portfolio Segment [Member] | Commercial real estate | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	28,137	1,459
Commercial Portfolio Segment [Member] | Commercial real estate | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	717	0
Commercial Portfolio Segment [Member] | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	13,927,795	13,556,736
Commercial Portfolio Segment [Member] | Multi-family
Financing Receivable, Past Due [Line Items]
Loans and leases	7,896,586	7,587,970
90 or More Days Past Due and Accruing	0	0
Non-accrual	10,439	0
Commercial Portfolio Segment [Member] | Multi-family | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	54,595	7,538
Commercial Portfolio Segment [Member] | Multi-family | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	21,750	5,198
Commercial Portfolio Segment [Member] | Multi-family | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	22,406	2,340
Commercial Portfolio Segment [Member] | Multi-family | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	7,841,991	7,580,432
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,280,058	1,328,786
90 or More Days Past Due and Accruing	0	0
Non-accrual	8,677	9,828
Commercial Portfolio Segment [Member] | Equipment financing | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	17,850	13,802
Commercial Portfolio Segment [Member] | Equipment financing | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	6,189	3,966
Commercial Portfolio Segment [Member] | Equipment financing | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	2,984	8
Commercial Portfolio Segment [Member] | Equipment financing | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,262,208	1,314,984
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	9,760,126	9,796,218
90 or More Days Past Due and Accruing	0	0
Non-accrual	31,723	29,391
Consumer Portfolio Segment [Member] | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	56,251	59,968
Consumer Portfolio Segment [Member] | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	14,716	20,980
Consumer Portfolio Segment [Member] | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	9,812	9,597
Consumer Portfolio Segment [Member] | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	9,703,875	9,736,250
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Past Due [Line Items]
Loans and leases	8,226,154	8,227,923
90 or More Days Past Due and Accruing	0	0
Non-accrual	8,589	5,704
Consumer Portfolio Segment [Member] | Residential | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	26,253	26,816
Consumer Portfolio Segment [Member] | Residential | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	9,645	14,894
Consumer Portfolio Segment [Member] | Residential | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	8,019	6,218
Consumer Portfolio Segment [Member] | Residential | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	8,199,901	8,201,107
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	1,479,420	1,516,955
90 or More Days Past Due and Accruing	0	0
Non-accrual	22,934	23,545
Consumer Portfolio Segment [Member] | Home equity | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	29,557	32,506
Consumer Portfolio Segment [Member] | Home equity | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	4,971	5,676
Consumer Portfolio Segment [Member] | Home equity | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,652	3,285
Consumer Portfolio Segment [Member] | Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,449,863	1,484,449
Consumer Portfolio Segment [Member] | Other consumer
Financing Receivable, Past Due [Line Items]
Loans and leases	54,552	51,340
90 or More Days Past Due and Accruing	0	0
Non-accrual	200	142
Consumer Portfolio Segment [Member] | Other consumer | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	441	646
Consumer Portfolio Segment [Member] | Other consumer | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	100	410
Consumer Portfolio Segment [Member] | Other consumer | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	141	94
Consumer Portfolio Segment [Member] | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 54,111	$ 50,694