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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill by Reportable Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Goodwill [Line Items]        
Goodwill. $ 948,164 $ 698,635 $ 333,249 $ 248,958
Capital Markets        
Goodwill [Line Items]        
Goodwill. 451,345      
Servicing and Asset Management        
Goodwill [Line Items]        
Goodwill. $ 496,819