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MORTGAGE SERVICING RIGHTS - Additional Information (Details) - USD ($)
$ in Billions
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Transfers and Servicing [Abstract]    
Mortgage servicing right weighted average life 8 years 6 months 8 years 6 months
Unpaid principal balance of mortgage loans serviced $ 83.7 $ 78.9