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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other comprehensive income (loss):
Other comprehensive income (loss)	$ 59,241	$ 137,407	$ 160,924	$ 105,552
Other comprehensive income (loss):
Other comprehensive (loss) income, tax effect	(9,000)	(20,049)	(22,365)	(15,335)
Net of Tax
Balance, beginning of period			5,603,658
Other comprehensive income (loss):
Total other comprehensive income	50,241	117,358	138,559	90,217
Balance, end of period	5,738,974	5,640,985	5,738,974	5,640,985
Accumulated Other Comprehensive Loss
Before Tax
AOCI before tax, beginning of period	(252,615)	(354,847)	(354,298)	(322,992)
Other comprehensive income (loss):
AOCI before tax, end of period	(193,374)	(217,440)	(193,374)	(217,440)
Tax Effect
AOCI tax effect, beginning of period	36,949	47,210	50,314	42,496
Other comprehensive income (loss):
AOCI tax effect, end of period	27,949	27,161	27,949	27,161
Net of Tax
Balance, beginning of period	(215,666)	(307,637)	(303,984)	(280,496)
Other comprehensive income (loss):
Total other comprehensive income	50,241	117,358	138,559	90,217
Balance, end of period	(165,425)	(190,279)	(165,425)	(190,279)
Accumulated Net Investment Gains (Losses) On Investments
Other comprehensive income (loss):
Unrealized holding gains (losses) arising during the period	58,816	137,475	160,189	103,316
Less: Reclassification adjustment for (gains) losses included in net income	425	(68)	735	2,236
Other comprehensive income (loss)	59,241	137,407	160,924	105,552
Other comprehensive income (loss):
Unrealized holding gains (losses) arising during the period	(8,916)	(20,064)	(22,220)	(14,922)
Less: Reclassification adjustment for gains (loss) included in net income	(84)	15	(145)	(413)
Other comprehensive (loss) income, tax effect	(9,000)	(20,049)	(22,365)	(15,335)
Other comprehensive income (loss):
Unrealized holding gains (losses) arising during the period	49,900	117,411	137,969	88,394
Less: Reclassification adjustment for (gains) losses included in net income	341	(53)	590	1,823
Total other comprehensive income	$ 50,241	$ 117,358	$ 138,559	$ 90,217

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