Loans Composition (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 29,494,263	$ 29,216,218
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	9,858,329	9,731,555
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,095,894	1,061,700
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	10,954,223	10,793,255
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Loans	5,035,195	5,124,245
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,287,041	2,271,398
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,322,237	7,395,644
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	18,276,460	18,188,898
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,868,180	7,864,891
Automobile Loan
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,471,257	2,256,162
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Loans	619,764	628,526
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	258,603	277,740
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 11,217,802	$ 11,027,319