Consolidated Obligations CO Bonds by Interest Rate-Payment Type (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total par value		$ 24,412,810	$ 23,804,805
Fixed-rate [Member]
Debt Instrument [Line Items]
Total par value		17,068,810	17,681,805
Simple variable-rate [Member]
Debt Instrument [Line Items]
Total par value		6,959,000	5,568,000
Step-up [Member]
Debt Instrument [Line Items]
Total par value	[1]	$ 385,000	$ 555,000

[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.