Business Combinations (Details)				3 Months Ended
	Apr. 01, 2022 USD ($) $ / shares shares	Feb. 01, 2022 USD ($)	Dec. 01, 2021 USD ($) office shares	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 1,468,354,000		$ 1,459,008,000
Assets				43,551,457,000		43,446,443,000
Loans				35,001,895,000		33,794,455,000
Deposits				35,647,336,000		$ 35,632,412,000
Goodwill increase				5,000,000
Merger expenses				4,400,000	$ 0
Westchester Bank Holding Corporation
Business Acquisition [Line Items]
Assets			$ 1,400,000,000
Loans			915,000,000
Deposits			$ 1,200,000,000
Bank Leumi Le-Israel Corporation
Business Acquisition [Line Items]
Assets				8,300,000,000
Loans				6,100,000,000
Deposits				$ 7,100,000,000
Landmark Insurance of the Palm Beaches
Business Acquisition [Line Items]
Payments to acquire business		$ 8,600,000
Contingent consideration		1,000,000
Goodwill		4,400,000
Other intangible assets		$ 6,200,000
Westchester Bank Holding Corporation
Business Acquisition [Line Items]
Number of branches | office			7
Number of shares issued for every share owned (in shares) | shares			229.645
Consideration transferred			$ 211,100,000
Shares issued in connection with acquisition (in shares) | shares			15,700,000
Bank Leumi Le-Israel Corporation | Subsequent Event
Business Acquisition [Line Items]
Payments to acquire business	$ 113,400,000
Number of shares issued for every share owned (in shares) | shares	3.8025
Consideration transferred	$ 1,200,000,000
Shares issued in connection with acquisition (in shares) | shares	85,000,000
Cash paid for every share owned (in dollars per share) | $ / shares	$ 5.08
Percentage of common stock transferred	14.00%