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Accumulated Other Comprehensive Income (Loss) - Rollforward of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Net of Tax                
Balance at beginning and end of the period $ (329,105)   $ (329,105)     $ 120,093    
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized (202,665) $ 64,477 (453,957) $ (82,892)        
Net realized gains (losses) on disposals and non-credit related impairment losses (3,113) 1,876 (4,675) 1,252        
Net decrease (increase) in expected credit losses 0 480 0 725        
Net unrealized gains (losses) on investments (199,552) 62,121 (449,282) (84,869)        
Other adjustments to other comprehensive income (loss) 0 0 84 0        
Other comprehensive income (loss), net of tax (199,552) 62,121 (449,198) (84,869)        
Other Comprehensive Income                
Before Tax                
Balance at beginning of period (163,991) 147,766 152,016 333,829        
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized (256,538) 81,617 (574,629) (104,926)        
Net realized gains (losses) on disposals and non-credit related impairment losses (3,940) 2,375 (5,918) 1,585        
Net decrease (increase) in expected credit losses   608   918        
Net unrealized gains (losses) on investments (252,598) 78,634 (568,711) (107,429)        
Other adjustments to comprehensive income (loss), net 0   106          
Other comprehensive income (loss) (252,598) 78,634 (568,605) (107,429)        
Balance at end of period (416,589) 226,400 (416,589) 226,400        
Tax Effect                
Balance at beginning of period (34,438) 31,031 31,923 70,104        
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized (53,873) 17,140 (120,672) (22,034)        
Net realized gains (losses) on disposals and non-credit related impairment losses (827) 499 (1,243) 333        
Net decrease (increase) in expected credit losses   128   193        
Net unrealized gains (losses) on investments (53,046) 16,513 (119,429) (22,560)        
Other adjustments to comprehensive income (loss), net 0   22          
Other comprehensive income (loss) (53,046) 16,513 (119,407) (22,560)        
AOCI Tax, Balance at end of period (87,484) 47,544 (87,484) 47,544        
Net of Tax                
Balance at beginning and end of the period (329,105) 178,856 (329,105) 178,856 $ (129,553) $ 120,093 $ 116,735 $ 263,725
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized (202,665) 64,477 (453,957) (82,892)        
Net realized gains (losses) on disposals and non-credit related impairment losses (3,113) 1,876 (4,675) 1,252        
Net decrease (increase) in expected credit losses   480   725        
Net unrealized gains (losses) on investments (199,552) 62,121 (449,282) (84,869)        
Other adjustments to other comprehensive income (loss) 0   84          
Other comprehensive income (loss), net of tax $ (199,552) $ 62,121 $ (449,198) $ (84,869)