Consolidated Obligations CO Bonds Outstanding by Contractual Maturity or Next Call Date (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Due in one year or less	$ 11,488,560	$ 9,455,725
Due after one year through two years	4,990,405	6,442,960
Due after two years through three years	2,269,475	2,154,920
Due after three years through four years	1,211,550	1,319,915
Due after four years through five years	1,474,280	1,211,080
Thereafter	2,978,540	3,220,205
Total par value	24,412,810	23,804,805
Earlier Of Contractual Maturity Or Next Call Date [Member]
Debt Instrument [Line Items]
Due in one year or less	13,165,560	11,297,725
Due after one year through two years	5,055,405	6,432,960
Due after two years through three years	2,189,475	2,019,920
Due after three years through four years	1,209,550	1,332,915
Due after four years through five years	1,134,280	926,080
Thereafter	1,658,540	1,795,205
Total par value	$ 24,412,810	$ 23,804,805