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Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) SubleaseArrangement	Jun. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
Operating lease right of use asset	$ 29,800		$ 29,800
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets
Lease liabilities	$ 29,800		$ 29,800
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities		Other liabilities
Number of sublease arrangement | SubleaseArrangement			1
Sublease income	$ 750	$ 828	$ 1,600	$ 1,700
Operating lease, weighted average remaining lease term	5 years 9 months 18 days		5 years 9 months 18 days
Operating lease, weighted average discount rate, percent	3.10%		3.10%
Operating lease, payments	$ 2,900	2,900	$ 5,900	5,800
Right-of-Use asset obtained in exchange for operating lease liability			690
Allowance for credit losses on off-balance sheet credit exposures	$ 37,646	$ 37,646	$ 37,646	$ 37,646	$ 37,646	$ 37,646	$ 36,503	$ 36,503
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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Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of sublease income excluding finance and operating lease expense.

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