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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Other comprehensive income (loss):        
Other comprehensive income, before tax $ (41,144) $ (158,503) $ 27,037 $ (397,406)
Other comprehensive income (loss):        
Other comprehensive income, tax effect 5,046 24,235 (4,382) 60,132
Net of Tax        
Balance, beginning of period     4,462,309  
Other comprehensive income (loss):        
Total other comprehensive income (loss) (36,098) (134,268) 22,655 (337,274)
Balance, end of period 4,733,352 4,271,995 4,733,352 4,271,995
Accumulated Other Comprehensive Loss        
Before Tax        
AOCI before tax, beginning of period (375,049) (173,623) (443,230) 65,280
Other comprehensive income (loss):        
AOCI before tax, end of period (416,193) (332,126) (416,193) (332,126)
Tax Effect        
AOCI tax effect, beginning of period 51,012 21,324 60,440 (14,573)
Other comprehensive income (loss):        
AOCI tax effect, end of period 56,058 45,559 56,058 45,559
Net of Tax        
Balance, beginning of period (324,037) (152,299) (382,790) 50,707
Other comprehensive income (loss):        
Total other comprehensive income (loss) (36,098) (134,268) 22,655 (337,274)
Balance, end of period (360,135) (286,567) (360,135) (286,567)
Accumulated Net Investment Gains (Losses) On Investments        
Other comprehensive income (loss):        
Unrealized holding gains (losses) arising during the period, before tax (42,733) (158,974) 24,960 (405,229)
Less: Reclassification adjustment for losses (gains) included in net income, before tax 1,589 471 2,077 7,823
Other comprehensive income, before tax (41,144) (158,503) 27,037 (397,406)
Other comprehensive income (loss):        
Unrealized holding gains (losses) arising during the period, tax effect 5,385 24,322 (4,091) 59,152
Less: Reclassification adjustment for losses (gains) included in net income, tax effect (339) (87) (291) 980
Other comprehensive income, tax effect 5,046 24,235 (4,382) 60,132
Other comprehensive income (loss):        
Unrealized holding gains (losses) arising during the period, net of tax (37,348) (134,652) 20,869 (346,077)
Less: Reclassification adjustment for losses (gains) included in net income, net of tax 1,250 384 1,786 8,803
Total other comprehensive income (loss) $ (36,098) $ (134,268) $ 22,655 $ (337,274)