Loans and Allowance for Credit Losses for Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 43,560,777	$ 34,153,657
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,514,458	5,847,551
Loans, deferred income, PPP	2,500	12,100
Commercial and industrial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,378,454	5,411,601
Commercial and industrial | Commercial and industrial PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	136,004	435,950
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	26,909,459	20,790,066
Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	23,535,086	18,935,486
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,374,373	1,854,580
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,005,069	4,545,064
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,131,791	2,970,976
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	431,455	400,779
Consumer | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,673,482	1,570,036
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,026,854	$ 1,000,161