Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 45,646,743	$ 22,271,729
90 or More Days Past Due and Accruing	8	2,496
Non-accrual	235,998	109,927
Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	286,042	131,842
30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	20,254	12,329
60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	29,782	7,090
Current
Financing Receivable, Past Due [Line Items]
Loans and leases	45,360,701	22,139,887
Commercial
Financing Receivable, Past Due [Line Items]
Loans and leases	36,662,265	15,179,966
90 or More Days Past Due and Accruing	8	2,496
Non-accrual	177,322	70,467
Commercial | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	207,492	83,175
Commercial | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	5,408	5,271
Commercial | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	24,754	4,941
Commercial | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	36,454,773	15,096,791
Commercial | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	13,935,450	6,882,480
90 or More Days Past Due and Accruing	8	1,977
Non-accrual	91,672	59,607
Commercial | Commercial non-mortgage | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	96,894	69,837
Commercial | Commercial non-mortgage | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	4,494	3,729
Commercial | Commercial non-mortgage | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	720	4,524
Commercial | Commercial non-mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	13,838,556	6,812,643
Commercial | Asset-based
Financing Receivable, Past Due [Line Items]
Loans and leases	1,892,278	1,067,248
90 or More Days Past Due and Accruing	0	0
Non-accrual	25,840	2,086
Commercial | Asset-based | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	25,840	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	1,866,438	1,065,162
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	12,365,451	5,463,321
90 or More Days Past Due and Accruing	0	519
Non-accrual	44,461	5,046
Commercial | Commercial real estate | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	56,028	6,490
Commercial | Commercial real estate | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	546	508
Commercial | Commercial real estate | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	11,021	417
Commercial | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	12,309,423	5,456,831
Commercial | Multi-family
Financing Receivable, Past Due [Line Items]
Loans and leases	5,776,219	1,139,859
90 or More Days Past Due and Accruing	0	0
Non-accrual	354	0
Commercial | Multi-family | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	12,965	0
Commercial | Multi-family | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	231	0
Commercial | Multi-family | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	12,380	0
Commercial | Multi-family | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	5,763,254	1,139,859
Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,778,326	627,058
90 or More Days Past Due and Accruing	0	0
Non-accrual	14,995	3,728
Commercial | Equipment financing | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	15,765	4,762
Commercial | Equipment financing | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	137	1,034
Commercial | Equipment financing | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	633	0
Commercial | Equipment financing | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,762,561	622,296
Commercial | Warehouse lending
Financing Receivable, Past Due [Line Items]
Loans and leases	914,541	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	914,541
Consumer
Financing Receivable, Past Due [Line Items]
Loans and leases	8,984,478	7,091,763
90 or More Days Past Due and Accruing	0	0
Non-accrual	58,676	39,460
Consumer | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	78,550	48,667
Consumer | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	14,846	7,058
Consumer | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	5,028	2,149
Consumer | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	8,905,928	7,043,096
Consumer | Residential
Financing Receivable, Past Due [Line Items]
Loans and leases	7,223,728	5,412,905
90 or More Days Past Due and Accruing	0	0
Non-accrual	26,490	15,747
Consumer | Residential | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	37,094	19,327
Consumer | Residential | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	6,998	3,212
Consumer | Residential | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,606	368
Consumer | Residential | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	7,186,634	5,393,578
Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	1,681,610	1,593,559
90 or More Days Past Due and Accruing	0	0
Non-accrual	32,061	23,489
Consumer | Home equity | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	37,299	28,556
Consumer | Home equity | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,972	3,467
Consumer | Home equity | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,266	1,600
Consumer | Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,644,311	1,565,003
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans and leases	79,140	85,299
90 or More Days Past Due and Accruing	0	0
Non-accrual	125	224
Consumer | Other consumer | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	4,157	784
Consumer | Other consumer | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,876	379
Consumer | Other consumer | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	156	181
Consumer | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 74,983	$ 84,515