Business Combinations - Additional information (Details) $ / shares in Units, $ in Thousands				6 Months Ended	12 Months Ended
	Dec. 01, 2021 USD ($) office shares	Oct. 08, 2021 USD ($)	Dec. 01, 2019 USD ($) office shares	Jun. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 16, 2021 USD ($)
Business Acquisition [Line Items]
Assets					$ 43,446,443	$ 40,686,076
Net loans					33,794,455	31,876,869
Deposits					35,632,412	31,935,602
Number of shares issued in connection with acquisition for every share owned (in shares) | shares			1.60
Goodwill increase						8,800
Merger expenses					8,900	$ 1,900	$ 16,600
Westchester Bank Holding Corporation
Business Acquisition [Line Items]
Assets	$ 1,400,000
Net loans	915,000
Deposits	$ 1,200,000
Bank Leumi Le-Israel Corporation
Business Acquisition [Line Items]
Assets					8,300,000
Net loans					5,700,000
Deposits					7,100,000
Westchester Bank Holding Corporation
Business Acquisition [Line Items]
Number of branches acquired | office	7
Number of shares issued in connection with acquisition for every share owned (in shares) | shares	229.645
Consideration transferred	$ 211,100
Shares issued in connection with acquisition (in shares) | shares	15,700,000
Non-credit discount at acquisition	$ 8,457
Purchased with credit deterioration, average contractual life of loans	8 years
Estimated useful life of acquired intangible assets	10 years
Other intangible assets	$ 8,130				$ 8,100
Dudley Ventures
Business Acquisition [Line Items]
Cash payments to acquire business		$ 11,300
Common stock issued in acquisition		$ 3,800
DV Entities
Business Acquisition [Line Items]
Other intangible assets								$ 2,100
Oritani Financial Corp.
Business Acquisition [Line Items]
Assets			$ 4,300,000
Net loans			3,400,000
Deposits			$ 2,900,000
Number of branches acquired | office			26
Consideration transferred			$ 835,300
Shares issued in connection with acquisition (in shares) | shares			71,100,000
Bank Leumi Le-Israel Corporation | Forecast
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition for every share owned (in shares) | shares				3.8025
Consideration transferred				$ 1,200,000
Cash paid for every share owned in connection with acquisition (in dollars per share) | $ / shares				$ 5.08
Percentage of common stock transferred in connection with acquisition				14.00%