Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Feb. 01, 2022
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0	$ 0
Goodwill from business combinations			412,497,000
Net impairment (net recovery)	0	(32,000)	0	(864,000)
Amortization of other intangible assets	11,088,000	5,298,000	26,925,000	16,753,000
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		6,200,000		$ 6,200,000
Bank Leumi USA
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 39,000,000		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			62,875,000
Wealth Management | Consumer Lending
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations			10,984,000
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