Investment Securities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) security instrument	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Summary of Investment Holdings [Line Items]
Transferred from available-for-sale to held-for-maturity	$ 143,000,000
Allowance for credit losses for available-for-sale debt securities	0		$ 0
Allowance for securities held-to-maturity	(150,000)		(150,000)
Accrued interest receivable	$ 39,100,000		50,900,000
Number of securities in security portfolio | security	3,093
Number of securities in unrealized loss position | security	2,688
Fair Value	$ 6,687,066,000		6,773,712,000
Unrealized losses	817,596,000		847,474,000
Equity securities, at fair value	72,158,000		52,507,000
Losses on equity securities	(800,000)	$ (1,900,000)
Impairments on equity securities without readily determinable fair value	0	$ 0
Other Assets
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	395,900,000		396,800,000
Other Assets | Partnership Interest
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	243,400,000
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	$ 152,500,000
Pooled trust preferred securities
Summary of Investment Holdings [Line Items]
Number of instruments held | instrument	2
Fair Value	$ 10,849,000		10,811,000
Unrealized losses	$ 2,938,000		$ 2,972,000