Acquisition and Divestiture - Summary of Acquisition, Pro Forma Information (Details) - Peoples United Financial Inc [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total revenues	$ 1,931,788	[1]
Net income	$ 369,404

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