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Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
SubleaseArrangement
Sep. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]                
Operating lease right of use asset $ 27,600   $ 27,600          
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets   Other assets          
Lease liabilities $ 27,600   $ 27,600          
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities   Other liabilities          
Number of sublease arrangement | SubleaseArrangement     1          
Sublease income $ 856 $ 826 $ 2,500 $ 2,500        
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 $ 8,700 8,700        
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 $ 37,646 $ 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