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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Other comprehensive income (loss):    
Other comprehensive income, before tax $ 68,181 $ (238,903)
Other comprehensive income (loss):    
Other comprehensive income, tax effect (9,428) 35,897
Net of Tax    
Balance, beginning of period 4,462,309  
Other comprehensive income (loss):    
Total other comprehensive income (loss) 58,753 (203,006)
Balance, end of period 4,648,941 4,215,068
Accumulated Other Comprehensive Loss    
Before Tax    
AOCI before tax, beginning of period (443,230) 65,280
Other comprehensive income (loss):    
AOCI before tax, end of period (375,049) (173,623)
Tax Effect    
AOCI tax effect, beginning of period 60,440 (14,573)
Other comprehensive income (loss):    
AOCI tax effect, end of period 51,012 21,324
Net of Tax    
Balance, beginning of period (382,790) 50,707
Other comprehensive income (loss):    
Total other comprehensive income (loss) 58,753 (203,006)
Balance, end of period (324,037) (152,299)
Accumulated Net Investment Gains (Losses) On Investments    
Other comprehensive income (loss):    
Unrealized holding gains (losses) arising during the period, before tax 67,693 (246,255)
Less: Reclassification adjustment for losses included in net income, before tax 488 7,352
Other comprehensive income, before tax 68,181 (238,903)
Other comprehensive income (loss):    
Unrealized holding gains (losses) arising during the period, tax effect (9,476) 34,830
Less: Reclassification adjustment for losses included in net income, tax effect 48 1,067
Other comprehensive income, tax effect (9,428) 35,897
Other comprehensive income (loss):    
Unrealized holding gains (losses) arising during the period, net of tax 58,217 (211,425)
Less: Reclassification adjustment for losses included in net income, net of tax 536 8,419
Total other comprehensive income (loss) $ 58,753 $ (203,006)