Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 47,823,875	$ 22,271,729
90 or More Days Past Due and Accruing	703	2,496
Non-accrual	200,233	109,927
Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	246,078	131,842
30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	34,753	12,329
60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	10,389	7,090
Current
Financing Receivable, Past Due [Line Items]
Loans and leases	47,577,797	22,139,887
Commercial
Financing Receivable, Past Due [Line Items]
Loans and leases	38,473,572	15,179,966
90 or More Days Past Due and Accruing	703	2,496
Non-accrual	143,952	70,467
Commercial | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	171,571	83,175
Commercial | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	21,380	5,271
Commercial | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	5,536	4,941
Commercial | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	38,302,001	15,096,791
Commercial | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	15,148,507	6,882,480
90 or More Days Past Due and Accruing	703	1,977
Non-accrual	61,598	59,607
Commercial | Commercial non-mortgage | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	78,529	69,837
Commercial | Commercial non-mortgage | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	12,270	3,729
Commercial | Commercial non-mortgage | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,958	4,524
Commercial | Commercial non-mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	15,069,978	6,812,643
Commercial | Asset-based
Financing Receivable, Past Due [Line Items]
Loans and leases	1,803,719	1,067,248
90 or More Days Past Due and Accruing	0	0
Non-accrual	25,093	2,086
Commercial | Asset-based | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	25,093	2,086
Commercial | Asset-based | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial | Asset-based | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial | Asset-based | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,778,626	1,065,162
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	12,742,888	5,463,321
90 or More Days Past Due and Accruing	0	519
Non-accrual	41,961	5,046
Commercial | Commercial real estate | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	47,267	6,490
Commercial | Commercial real estate | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	5,172	508
Commercial | Commercial real estate | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	134	417
Commercial | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	12,695,621	5,456,831
Commercial | Multi-family
Financing Receivable, Past Due [Line Items]
Loans and leases	6,119,731	1,139,859
90 or More Days Past Due and Accruing	0	0
Non-accrual	1,972	0
Commercial | Multi-family | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	2,735	0
Commercial | Multi-family | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	677	0
Commercial | Multi-family | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	86	0
Commercial | Multi-family | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	6,116,996	1,139,859
Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,764,289	627,058
90 or More Days Past Due and Accruing	0	0
Non-accrual	13,328	3,728
Commercial | Equipment financing | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	17,947	4,762
Commercial | Equipment financing | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,261	1,034
Commercial | Equipment financing | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,358	0
Commercial | Equipment financing | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,746,342	622,296
Commercial | Warehouse lending
Financing Receivable, Past Due [Line Items]
Loans and leases	894,438	0
90 or More Days Past Due and Accruing	0
Non-accrual	0
Commercial | Warehouse lending | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	0
Commercial | Warehouse lending | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0
Commercial | Warehouse lending | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0
Commercial | Warehouse lending | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	894,438
Consumer
Financing Receivable, Past Due [Line Items]
Loans and leases	9,350,303	7,091,763
90 or More Days Past Due and Accruing	0	0
Non-accrual	56,281	39,460
Consumer | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	74,507	48,667
Consumer | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	13,373	7,058
Consumer | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	4,853	2,149
Consumer | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	9,275,796	7,043,096
Consumer | Residential
Financing Receivable, Past Due [Line Items]
Loans and leases	7,617,955	5,412,905
90 or More Days Past Due and Accruing	0	0
Non-accrual	25,309	15,747
Consumer | Residential | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	37,805	19,327
Consumer | Residential | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	8,969	3,212
Consumer | Residential | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,527	368
Consumer | Residential | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	7,580,150	5,393,578
Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	1,662,756	1,593,559
90 or More Days Past Due and Accruing	0	0
Non-accrual	30,700	23,489
Consumer | Home equity | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	35,940	28,556
Consumer | Home equity | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	4,083	3,467
Consumer | Home equity | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,157	1,600
Consumer | Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,626,816	1,565,003
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans and leases	69,592	85,299
90 or More Days Past Due and Accruing	0	0
Non-accrual	272	224
Consumer | Other consumer | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	762	784
Consumer | Other consumer | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	321	379
Consumer | Other consumer | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	169	181
Consumer | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 68,830	$ 84,515