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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
Other comprehensive income (loss):        
Other comprehensive (loss) income $ (89,048) $ (159,010) $ (62,011) $ (556,416)
Other comprehensive income (loss):        
Other comprehensive income, tax effect 12,800 22,000 8,418 82,132
Net of Tax        
Balance, beginning of period     4,462,309  
Other comprehensive income (loss):        
Total other comprehensive income loss (76,248) (137,010) (53,593) (474,284)
Balance, end of period 4,808,007 4,294,208 4,808,007 4,294,208
Accumulated Other Comprehensive Loss        
Before Tax        
AOCI before tax, beginning of period (416,193) (332,126) (443,230) 65,280
Other comprehensive income (loss):        
AOCI before tax, end of period (505,241) (491,136) (505,241) (491,136)
Tax Effect        
AOCI tax effect, beginning of period 56,058 45,559 60,440 (14,573)
Other comprehensive income (loss):        
AOCI tax effect, end of period 68,858 67,559 68,858 67,559
Net of Tax        
Balance, beginning of period (360,135) (286,567) (382,790) 50,707
Other comprehensive income (loss):        
Total other comprehensive income loss (76,248) (137,010) (53,593) (474,284)
Balance, end of period (436,383) (423,577) (436,383) (423,577)
Accumulated Net Investment Gains (Losses) On Investments        
Other comprehensive income (loss):        
Unrealized holding gains (losses) arising during the period, before tax (89,283) (158,835) (64,323) (564,064)
Less: Reclassification adjustment for (gains) losses included in net income, before tax 235 (175) 2,312 7,648
Other comprehensive (loss) income (89,048) (159,010) (62,011) (556,416)
Other comprehensive income (loss):        
Unrealized holding gains (losses) arising during the period, tax effect 12,851 21,899 8,760 81,051
Less: Reclassification adjustment for losses (gains) included in net income, tax effect (51) 101 (342) 1,081
Other comprehensive income, tax effect 12,800 22,000 8,418 82,132
Other comprehensive income (loss):        
Unrealized holding gains (losses) arising during the period, net of tax (76,432) (136,936) (55,563) (483,013)
Less: Reclassification adjustment for losses (gains) included in net income, net of tax 184 (74) 1,970 8,729
Total other comprehensive income loss $ (76,248) $ (137,010) $ (53,593) $ (474,284)