Consolidated Obligations CO Bonds - Interest-Rate-Payment Type (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total par value		$ 23,804,805	$ 25,901,315
Fixed-rate [Member]
Debt Instrument [Line Items]
Total par value		17,681,805	21,216,315
Simple variable-rate [Member]
Debt Instrument [Line Items]
Total par value		5,568,000	2,853,000
Step-up [Member]
Debt Instrument [Line Items]
Total par value	[1]	$ 555,000	$ 1,832,000

[1] Step-up bonds pay interest at increasing fixed rates for specified intervals over the life of the CO bond and can be called at our option on the step-up dates.