Loans and Leases - Summary of Loans and Leases by Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 53,056,223	$ 52,505,168
Commercial portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	42,263,970	42,068,001
Commercial portfolio | Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	18,266,697	18,037,942
Commercial portfolio | Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,385,042	1,404,007
Commercial portfolio | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,486,748	14,492,436
Commercial portfolio | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,896,396	6,898,600
Commercial portfolio | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,229,087	1,235,016
Consumer portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	10,792,253	10,437,167
Consumer portfolio | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	9,123,000	8,853,669
Consumer portfolio | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,392,129	1,427,692
Consumer portfolio | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 277,124	$ 155,806