Loans and Leases - Summary of Loans and Leases by Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 53,671,959	$ 52,505,168
Commercial portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	42,651,878	42,068,001
Commercial portfolio | Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	18,724,821	18,037,942
Commercial portfolio | Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,350,006	1,404,007
Commercial portfolio | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,539,706	14,492,436
Commercial portfolio | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,819,069	6,898,600
Commercial portfolio | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,218,276	1,235,016
Consumer portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	11,020,081	10,437,167
Consumer portfolio | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	9,332,413	8,853,669
Consumer portfolio | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,385,746	1,427,692
Consumer portfolio | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 301,922	$ 155,806