Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Feb. 01, 2022
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations			$ 412,497,000
Goodwill impairment			0	$ 0
Net impairment (net recovery)	$ 0	$ (42,000)		(833,000)
Amortization of other intangible assets	11,400,000	5,449,000	15,837,000	11,455,000
Core Deposits and Other
Finite-Lived Intangible Assets [Line Items]
Impairment of core deposits and other intangibles	$ 0	$ 0	$ 0	$ 0
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years			10 years
Other
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years			13 years 3 months 18 days
Westchester Bank Holding Corporation
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations			$ 5,000,000
Landmark Insurance of the Palm Beaches
Finite-Lived Intangible Assets [Line Items]
Other intangible assets					$ 6,200,000
Bank Leumi USA
Finite-Lived Intangible Assets [Line Items]
Other intangible assets					$ 39,000,000
Bank Leumi USA | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets			114,400,000
Consumer Lending
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations			85,000
Wealth Management | Consumer Lending
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations			15,564,000
Wealth Management | Consumer Lending | Landmark Insurance of the Palm Beaches
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations			4,400,000
Wealth Management | Consumer Lending | Bank Leumi USA
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations			$ 403,200,000