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Summary of Significant Accounting Policies - Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Business Acquisition    
Goodwill $ 46,062 $ 46,062
Indefinite-lived intangibles 7,500 7,500
Total goodwill and intangibles 53,562 53,562
Surety    
Business Acquisition    
Goodwill 40,816 40,816
Casualty    
Business Acquisition    
Goodwill $ 5,246 $ 5,246