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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Other comprehensive income (loss):
Other comprehensive (loss) income	$ 18,650	$ (6,967)	$ 101,683	$ (31,855)
Other comprehensive income (loss):
Other comprehensive (loss) income, tax effect	(2,070)	1,592		4,714
Net of Tax
Balance, beginning of period			5,603,658
Other comprehensive income (loss):
Total other comprehensive income (loss)	16,580	(5,375)	88,318	(27,141)
Balance, end of period	5,672,848	5,379,790	5,672,848	5,379,790
Accumulated Other Comprehensive Loss
Before Tax
AOCI before tax, beginning of period	(271,265)	(347,880)	(354,298)	(322,992)
Other comprehensive income (loss):
AOCI before tax, end of period	(252,615)	(354,847)	(252,615)	(354,847)
Tax Effect
AOCI tax effect, beginning of period	39,019	45,618	50,314	42,496
Other comprehensive income (loss):
AOCI tax effect, end of period	36,949	47,210	36,949	47,210
Net of Tax
Balance, beginning of period	(232,246)	(302,262)	(303,984)	(280,496)
Other comprehensive income (loss):
Total other comprehensive income (loss)	16,580	(5,375)	88,318	(27,141)
Balance, end of period	(215,666)	(307,637)	(215,666)	(307,637)
Accumulated Net Investment Gains (Losses) On Investments
Other comprehensive income (loss):
Unrealized holding gains (losses) arising during the period	18,521	(8,131)	101,373	(34,159)
Less: Reclassification adjustment for (gains) losses included in net income	129	1,164	310	2,304
Other comprehensive (loss) income	18,650	(6,967)	101,683	(31,855)
Other comprehensive income (loss):
Unrealized holding gains (losses) arising during the period	(2,043)	1,773	(13,303)	5,142
Less: Reclassification adjustment for gains (loss) included in net income	(27)	(181)	(62)	(428)
Other comprehensive (loss) income, tax effect	(2,070)	1,592	(13,365)	4,714
Other comprehensive income (loss):
Unrealized holding gains (losses) arising during the period	16,478	(6,358)	88,070	(29,017)
Less: Reclassification adjustment for (gains) losses included in net income	102	983	248	1,876
Total other comprehensive income (loss)	$ 16,580	$ (5,375)	$ 88,318	$ (27,141)

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