Consolidated Obligations CO Bonds Outstanding by Contractual Maturity (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Schedule of Short-term and Long-term Debt [Line Items]
Due in one year or less		$ 11,488,560	$ 9,455,725
Due in one year or less, weighted average rate	[1]	1.13%	2.03%
Due after one year through two years		$ 4,990,405	$ 6,442,960
Due after one year through two years, weighted average rate	[1]	1.80%	2.02%
Due after two years through three years		$ 2,269,475	$ 2,154,920
Due after two years through three years, weighted average rate	[1]	2.07%	2.18%
Due after three years through four years		$ 1,211,550	$ 1,319,915
Due after three years through four years, weighted average rate	[1]	2.47%	2.45%
Due after four years through five years		$ 1,474,280	$ 1,211,080
Due after four years through five years, weighted average rate	[1]	2.40%	2.48%
Thereafter		$ 2,978,540	$ 3,220,205
Thereafter, weighted average rate	[1]	3.43%	3.33%
Total par value		$ 24,412,810	$ 23,804,805
Hedging adjustments		100,905	32,066
Total		$ 24,576,586	$ 23,888,493
COs - bonds [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Total par value, weighted average rate	[1]	1.78%	2.26%
Premiums		$ 74,030	$ 63,056
Discounts		$ (11,159)	$ (11,434)

[1] The CO bonds' weighted-average rate excludes concession fees.