Loans and Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized premiums	$ (68,700)	$ 12,300
Interest Receivable	226,300	50,700
Total Loans and Leases	49,764,426	22,271,729
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	40,103,951	15,179,966
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	12,997,163	5,463,321
Commercial | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,628,393	627,058
Commercial | Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	16,392,795	6,882,480
Commercial | Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,821,642	1,067,248
Commercial | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	6,621,982	1,139,859
Commercial | Warehouse lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	641,976	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	9,660,475	7,091,763
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,633,107	1,593,559
Consumer | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	7,963,420	5,412,905
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 63,948	$ 85,299