Acquisition and Divestiture - Summary of Acquisition, Pro Forma Information (Details) - Peoples United Financial Inc [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total revenues	$ 6,134,400	[1]
Net income	$ 1,399,913

[1] Represents the total of net interest income and other income.