Loans and Allowance for Credit Losses for Loans - Summary of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 46,917,200	$ 34,153,657
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,804,830	5,847,551
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	29,432,868	20,790,066
Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	25,732,033	18,935,486
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,364,550	4,545,064
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,314,952	2,970,976
Home equity | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	503,884	400,779
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	258,692	241,258
Collateral Pledged | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	94,433	95,335
Collateral Pledged | Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	130,199	110,174
Collateral Pledged | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	33,865	35,745
Collateral Pledged | Home equity | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 195	$ 4