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Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Changes in AOCI by component
Beginning balance	$ 6,766,777	$ 6,608,634	$ 6,835,917
Other comprehensive loss	(2,034)	(1,758)	(5,603)
Ending balance	7,125,388	6,766,777	6,608,634
Cumulative Unrealized Gain (Loss) on Available-for- Sale Securities
Changes in AOCI by component
Beginning balance	13,594	15,352	20,955
OCI before reclassifications	(2,034)	(1,758)	(5,648)
Amounts reclassified from AOCI	0	0	45
Other comprehensive loss	(2,034)	(1,758)	(5,603)
Ending balance	$ 11,560	$ 13,594	$ 15,352

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