Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations	$ 409,928,000	$ 76,566,000
Impairment of core deposits and intangibles	0	0	$ 0
Net impairment (recovery of impairment) on loan servicing rights		865,000	(818,000)
Amortization expense - other intangible assets	37,800,000	21,800,000	24,600,000
Residential mortgage
Finite-Lived Intangible Assets [Line Items]
Aggregate principal balances of mortgage loans serviced	3,500,000,000	3,600,000,000	$ 3,500,000,000
Bank Leumi USA
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations	400,600,000
Assets acquired and liabilities assumed other than goodwill	39,000,000
Landmark
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations	4,400,000
Assets acquired and liabilities assumed other than goodwill	6,200,000
Westchester Bank Holding Corporation
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations	$ 5,000,000	63,500,000
Dudley Ventures
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations		$ 13,100,000
Core deposits
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years	10 years
Core deposits | Bank Leumi USA
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 114,400,000
Other
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years	13 years 4 months 24 days