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Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
SubleaseArrangement
Jun. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]                
Operating lease right of use asset $ 34,600   $ 34,600          
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 $ 828 $ 688 $ 1,700 $ 1,500        
Operating lease, weighted average remaining lease term 5 years 7 months 6 days   5 years 7 months 6 days          
Operating lease, weighted average discount rate, percent 2.90%   2.90%          
Operating lease, payments $ 2,900 3,100 $ 5,800 5,900        
Right-of-Use asset obtained in exchange for operating lease liability     2,100          
Allowance for credit losses on off-balance sheet credit exposures 37,646 $ 36,503 37,646 $ 36,503 $ 36,503 $ 36,503 $ 29,947 $ 29,947
Bank Term Funding Program [Member]                
Contractual Obligations And Off Balance Sheet Items [Line Items]                
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