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Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) SubleaseArrangement	Sep. 30, 2023 USD ($)	Jul. 01, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jul. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
Operating lease right of use asset	$ 35,500		$ 35,500
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities		Other liabilities
Number of sublease arrangement | SubleaseArrangement			1
Sublease income	$ 826	$ 816	$ 2,500	$ 2,300
Operating lease, weighted average remaining lease term	5 years 10 months 24 days		5 years 10 months 24 days
Operating lease, weighted average discount rate, percent	3.00%		3.00%
Operating lease, payments	$ 2,900	3,100	$ 8,700	9,000
Right-of-Use asset obtained in exchange for operating lease liability			5,200
Allowance for credit losses on off-balance sheet credit exposures	37,646	$ 36,503	37,646	$ 36,503	$ 37,646	$ 36,503	$ 36,503	$ 29,947
Bank Term Funding Program [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Pledged assets value at par	4,030,000		4,030,000
Outstanding amout consisting of one-term advance	3,900,000		$ 3,900,000
One-term advance maturity date			2025-01
Interest rate			4.76%
Interest payable	$ 186,100		$ 186,100
Minimum [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Lessee operating lease remaining lease term	1 year		1 year
Maximum [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Lessee operating lease remaining lease term	15 years		15 years

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