Consolidated Statements of Patronage Capital and Membership Fees (Unaudited) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Increase (Decrease) in Members' Capital
Net margin	$ 24,191		$ 18,414		$ 66,290	$ 42,824
Patronage Capital and Membership Fees
Increase (Decrease) in Members' Capital
Beginning balance	1,300,016	$ 1,257,917	1,216,537	$ 1,192,127	1,257,917	1,192,127
Net margin	24,191	42,099	18,414	24,410
Ending balance	$ 1,324,207	$ 1,300,016	$ 1,234,951	$ 1,216,537	$ 1,324,207	$ 1,234,951