Loans Composition (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 29,618,271	$ 29,216,218
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	9,970,412	9,731,555
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,102,146	1,061,700
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	11,072,558	10,793,255
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Loans	5,001,392	5,124,245
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,255,637	2,271,398
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,257,029	7,395,644
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	18,329,587	18,188,898
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,840,073	7,864,891
Automobile Loan
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,556,009	2,256,162
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Loans	634,142	628,526
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	258,460	277,740
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 11,288,684	$ 11,027,319