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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Other comprehensive income (loss):    
Other comprehensive (loss) income $ (24,888) $ 68,181
Other comprehensive income (loss):    
Other comprehensive (loss) income, tax effect 3,122 (9,428)
Net of Tax    
Balance, beginning of period 5,102,550  
Other comprehensive income (loss):    
Total other comprehensive income loss (21,766) 58,753
Balance, end of period 5,226,154 4,648,941
Accumulated Other Comprehensive Loss    
Before Tax    
AOCI before tax, beginning of period (322,992) (443,230)
Other comprehensive income (loss):    
AOCI before tax, end of period (347,880) (375,049)
Tax Effect    
AOCI tax effect, beginning of period 42,496 60,440
Other comprehensive income (loss):    
AOCI tax effect, end of period 45,618 51,012
Net of Tax    
Balance, beginning of period (280,496) (382,790)
Other comprehensive income (loss):    
Total other comprehensive income loss (21,766) 58,753
Balance, end of period (302,262) (324,037)
Accumulated Net Investment Gains (Losses) On Investments    
Other comprehensive income (loss):    
Unrealized holding (losses) gains arising during the year, before tax (26,028) 67,693
Less: Reclassification adjustment for gains included in net income 1,140 488
Other comprehensive (loss) income (24,888) 68,181
Other comprehensive income (loss):    
Unrealized holding (losses) gains arising during the year, tax effect 3,366 (9,476)
Less: Reclassification adjustment for (losses) gains included in net income (244) 48
Other comprehensive (loss) income, tax effect 3,122 (9,428)
Other comprehensive income (loss):    
Unrealized holding (losses) gains arising during the year, net of tax (22,662) 58,217
Less: Reclassification adjustment for losses (gains) included in net income 896 536
Total other comprehensive income loss $ (21,766) $ 58,753