Business Combinations (Details) - USD ($) $ / shares in Units, $ in Thousands			6 Months Ended
	Dec. 01, 2021	Oct. 08, 2021	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Assets				$ 41,278,007		$ 40,686,076
Loans				32,264,287		31,876,869
Deposits				33,632,605		$ 31,935,602
Merger expenses				$ 1,300
Westchester Bank Holding Corporation | Scenario, forecast
Business Acquisition [Line Items]
Number of shares issued for every share owned (in shares)	229.645
Business combination, consideration transferred, equity interests issued and issuable	$ 210,000
Payments to acquire business	$ 10,000
Bank Leumi Le-Israel Corporation | Scenario, forecast
Business Acquisition [Line Items]
Number of shares issued for every share owned (in shares)			3.8025
Cash paid for every share owned (in dollars per share)			$ 5.08
Consideration transferred			$ 1,100,000
Percentage of common stock transferred			14.00%
Dudley Ventures | Subsequent Event
Business Acquisition [Line Items]
Business combination, consideration transferred, equity interests issued and issuable		$ 3,800
Payments to acquire business		$ 11,300
Revenue growth, period		5 years
Westchester Bank Holding Corporation
Business Acquisition [Line Items]
Assets					$ 1,300,000
Loans					908,000
Deposits					1,100,000
Bank Leumi Le-Israel Corporation
Business Acquisition [Line Items]
Assets					8,400,000
Loans					5,400,000
Deposits					$ 7,100,000