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Investments - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Affiliates    
Schedule of Investments [Line Items]    
Investments $ 59,272 $ 76,524
Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 118,201 108,448
Stocks of Large Companies | Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 54,200 45,300
Debt Securities | Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 58,200 57,800
Stocks of Small and Mid Sized Companies | Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 3,600 3,300
Mutual Fund | Consolidated Investment Companies    
Schedule of Investments [Line Items]    
Investments 2,200 2,100
Federated Hermes Funds | Affiliates    
Schedule of Investments [Line Items]    
Investments 52,400 67,000
Separate Accounts | Affiliates    
Schedule of Investments [Line Items]    
Investments 6,900 9,500
Separate Accounts | Stocks of Large Companies | Affiliates    
Schedule of Investments [Line Items]    
Investments 3,200 3,400
Separate Accounts | Debt Securities | Affiliates    
Schedule of Investments [Line Items]    
Investments $ 2,300 $ 4,600