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Intangible Assets - Components of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 62,358 $ 62,358
Accumulated amortization (61,044) (59,731)
Net carrying amount 1,314 2,627
Investment management contracts    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 36,190 36,190
Accumulated amortization (36,190) (36,190)
Net carrying amount 0 0
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 23,518 23,518
Accumulated amortization (22,204) (20,891)
Net carrying amount 1,314 2,627
Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 2,030 2,030
Accumulated amortization (2,030) (2,030)
Net carrying amount 0 0
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 620 620
Accumulated amortization (620) (620)
Net carrying amount $ 0 $ 0