Consolidated Statements of Patronage Capital and Membership Fees (Unaudited) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Increase (Decrease) in Members' Capital
Net margin	$ 32,097			$ 8,907			$ 72,244	$ 48,010
Patronage Capital and Membership Fees
Increase (Decrease) in Members' Capital
Beginning balance	1,170,570	$ 1,152,403	$ 1,130,423	1,111,745	$ 1,098,600	$ 1,072,642	1,130,423	1,072,642
Net margin	32,097	18,167	21,980	8,907	13,145	25,958
Ending balance	$ 1,202,667	$ 1,170,570	$ 1,152,403	$ 1,120,652	$ 1,111,745	$ 1,098,600	$ 1,202,667	$ 1,120,652