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Fair Value of financial instruments- Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Letter Of Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure Off balance Sheet Risks Face Amount Asset $ 126 $ 82
Commitments to extend credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure Off balance Sheet Risks Face Amount Asset $ 11,000 $ 10,000