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Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
May 05, 2021
Jun. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]            
Incurred expense related to savings and retirement plans     $ 4,300 $ 4,100 $ 5,500  
ProAssurance deferred compensation liabilities total     $ 27,905 $ 52,332    
Defined benefit pension plan for annual compensation 5 years          
Maximum            
Defined Contribution Plan Disclosure [Line Items]            
Percentage of benefit plan contribution by employer (percent)   10.00% 5.00% 5.00%   10.00%