Acquisition - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 01, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Business Acquisition [Line Items]
Carrying Value		$ 2,010,600		$ 2,010,600		$ 1,750,000
Goodwill		8,501,357		8,501,357		4,593,112
Revenue		1,465,142	$ 970,358	2,393,398	$ 1,987,320
Net income		217,522	$ 458,069	579,696	$ 905,318
ACL for non-PCD loan and leases	$ 242,000
Initial estimate of expected credit losses	99,000
Purchase Credit-Deteriorated	3,400,000
Peoples United Financial Inc [Member]
Business Acquisition [Line Items]
Business combination, market value	$ 8,400,000
Common stock, price per share	$ 164.66
Assets	$ 60,244,818
Goodwill	3,908,245	8,501,357		$ 8,501,357		$ 4,593,112
Core deposits and other intangible assets	261,000
Revenue		492,000
Net income		$ (176,000)
ACL for non-PCD loan and leases	$ 242,000
Peoples United Financial Inc [Member] | Core Deposit and Other Intangible Assets [Member] | Minimum [Member]
Business Acquisition [Line Items]
Amortization period	3 years
Peoples United Financial Inc [Member] | Core Deposit and Other Intangible Assets [Member] | Maximum [Member]
Business Acquisition [Line Items]
Amortization period	7 years
Peoples United Financial Inc [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Common stock issued in transaction	50,325,004
MT [Member]
Business Acquisition [Line Items]
Common stock, price per share	$ 0.118