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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Before Tax                
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized $ (126,080) $ (223,279) $ (94,777) $ (797,908)        
Net realized gains (losses) on disposals and non-credit related impairment losses (2,794) (4,153) (13,180) (10,071)        
Net unrealized gains (losses) on investments (123,286) (219,126) (81,597) (787,837)        
Other adjustments to comprehensive income (loss), net 0 0 227 106        
Other comprehensive income (loss) (123,286) (219,126) (81,370) (787,731)        
Tax Effect                
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized (26,477) (46,888) (19,903) (167,560)        
Net realized gains (losses) on disposals and non-credit related impairment losses (587) (872) (2,768) (2,115)        
Net unrealized gains (losses) on investments (25,890) (46,016) (17,135) (165,445)        
Other adjustments to comprehensive income (loss), net 0 0 48 22        
Other comprehensive income (loss) (25,890) (46,016) (17,087) (165,423)        
Net of Tax                
Balance at beginning and end of the period (521,082)   (521,082)     $ (456,799)    
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized (99,603) (176,391) (74,874) (630,348)        
Net realized gains (losses) on disposals and non-credit related impairment losses (2,207) (3,281) (10,412) (7,956)        
Net unrealized gains (losses) on investments (97,396) (173,110) (64,462) (622,392)        
Other adjustments to other comprehensive income (loss) 0 0 179 84        
Other comprehensive income (loss), net of tax (97,396) (173,110) (64,283) (622,308)        
AOCI Attributable to Parent                
Before Tax                
Balance at beginning of period (536,312) (416,589) (578,228) 152,016        
Balance at end of period (659,598) (635,715) (659,598) (635,715)        
Tax Effect                
Balance at beginning of period (112,626) (87,484) (121,429) 31,923        
Balance at end of period (138,516) (133,500) (138,516) (133,500)        
Net of Tax                
Balance at beginning and end of the period (521,082) (502,215) (521,082) (502,215) $ (423,686) $ (456,799) $ (329,105) $ 120,093
Net unrealized gains (losses) on investments $ (97,396) $ (173,110) $ (64,462) $ (622,392)