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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other comprehensive income (loss):
Other comprehensive (loss) income	$ 137,407	$ (89,048)	$ 105,552	$ (62,011)
Other comprehensive income (loss):
Other comprehensive (loss) income, tax effect	(20,049)	12,800	(15,335)	8,418
Net of Tax
Balance, beginning of period			5,102,550
Other comprehensive income (loss):
Total other comprehensive income (loss)	117,358	(76,248)	90,217	(53,593)
Balance, end of period	5,640,985	4,808,007	5,640,985	4,808,007
Accumulated Other Comprehensive Loss
Before Tax
AOCI before tax, beginning of period	(354,847)	(416,193)	(322,992)	(443,230)
Other comprehensive income (loss):
AOCI before tax, end of period	(217,440)	(505,241)	(217,440)	(505,241)
Tax Effect
AOCI tax effect, beginning of period	47,210	56,058	42,496	60,440
Other comprehensive income (loss):
AOCI tax effect, end of period	27,161	68,858	27,161	68,858
Net of Tax
Balance, beginning of period	(307,637)	(360,135)	(280,496)	(382,790)
Other comprehensive income (loss):
Total other comprehensive income (loss)	117,358	(76,248)	90,217	(53,593)
Balance, end of period	(190,279)	(436,383)	(190,279)	(436,383)
Accumulated Net Investment Gains (Losses) On Investments
Other comprehensive income (loss):
Unrealized holding gains (losses) arising during the period	137,475	(89,283)	103,316	(64,323)
Less: Reclassification adjustment for (gains) losses included in net income	(68)	235	2,236	2,312
Other comprehensive (loss) income	137,407	(89,048)	105,552	(62,011)
Other comprehensive income (loss):
Unrealized holding gains (losses) arising during the period	(20,064)	12,851	(14,922)	8,760
Less: Reclassification adjustment for gains (loss) included in net income	15	(51)	(413)	(342)
Other comprehensive (loss) income, tax effect	(20,049)	12,800	(15,335)	8,418
Other comprehensive income (loss):
Unrealized holding (losses) gains arising during the year, net of tax	117,411	(76,432)	88,394	(55,563)
Less: Reclassification adjustment for (gains) losses included in net income	(53)	184	1,823	1,970
Total other comprehensive income (loss)	$ 117,358	$ (76,248)	$ 90,217	$ (53,593)

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