Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)		12 Months Ended
	Dec. 01, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations		$ 76,566,000	$ 8,817,000
Goodwill impairment		0	0	$ 0
Impairment of core deposits and intangibles		0	0	0
Net impairment (recovery of impairment) on loan servicing rights		865,000	(818,000)	36,000
Amortization expense - other intangible assets		21,800,000	24,600,000	18,100,000
Residential mortgage
Finite-Lived Intangible Assets [Line Items]
Aggregate principal balances of mortgage loans serviced		3,600,000,000	$ 3,500,000,000	$ 3,400,000,000
Westchester Bank Holding Corporation
Finite-Lived Intangible Assets [Line Items]
Goodwill from business combinations		63,500,000
Weighted average amortization period, years	10 years
Core deposit intangible assets	$ 8,130,000	8,100,000
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		9 years 2 months 12 days
Other
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years		6 years