Loans and Allowance for Credit Losses for Loans - Summary of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 50,311,702	$ 50,210,295
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,479,147	9,230,543
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	31,768,846	31,970,047
Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	28,223,123	28,243,239
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,545,723	3,726,808
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,627,113	5,569,010
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,436,596	3,440,695
Consumer loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	566,467	559,152
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	339,877	264,678
Non-accrual loans collateralized	52,600	62,300
Collateral Pledged | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	125,186	96,827
Collateral Pledged | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	195,654	145,419
Collateral Pledged | Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	153,503	98,785
Collateral Pledged | Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	42,151	46,634
Collateral Pledged | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,721	21,843
Collateral Pledged | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	589
Collateral Pledged | Consumer loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 316	$ 0