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Business Changes and Developments - Goodwill Associated with Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]      
Balance at beginning of period $ 125,493 $ 123,285  
Foreign Currency Translation and Other (1,041) 2,208  
Balance at end of period 124,452 125,493  
Goodwill, Impaired, Accumulated Impairment Loss 38,528 38,528 $ 38,528
Goodwill, Gross 162,980 164,021 $ 161,813
Investment Banking & Equities      
Goodwill [Roll Forward]      
Balance at beginning of period 117,966 115,758  
Foreign Currency Translation and Other (1,041) 2,208  
Balance at end of period 116,925 117,966  
Investment Management      
Goodwill [Roll Forward]      
Balance at beginning of period 7,527 7,527  
Foreign Currency Translation and Other 0 0  
Balance at end of period $ 7,527 $ 7,527