Advances - Outstanding by Year of Contractual Maturity (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Maturity, Rolling Year, Par Value [Abstract]
Overdrawn demand-deposit accounts		$ 5,101	$ 12,332
Due in one year or less		18,972,466	24,029,592
Due after one year through two years		8,600,922	11,413,640
Due after two years through three years		2,200,019	2,832,290
Due after three years through four years		1,766,314	1,648,076
Due after four years through five years		1,726,754	1,980,468
Thereafter		1,312,311	1,351,987
Total par value		$ 34,583,887	$ 43,268,385
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Rolling Year [Abstract]
Overdrawn demand-deposit accounts, Weighted average rate		2.05%	2.88%
Due in one year or less, Weighted average rate		1.96%	2.48%
Due after one year through two years, Weighted average rate		2.16%	2.55%
Due after two years through three years, Weighted average rate		2.16%	2.47%
Due after three years through four years, Weighted average rate		2.71%	2.37%
Due after four years through five years, Weighted average rate		2.15%	2.24%
Thereafter, Weighted average rate		2.68%	2.99%
Total Weighted average rate		2.10%	2.50%
Premiums		$ 3,397	$ 3,935
Discounts		(41,744)	(36,528)
Fair value of bifurcated derivatives	[1]	29,983	13,051
Hedging adjustments		19,840	(56,621)
Total Advances		$ 34,595,363	$ 43,192,222

[1] At December 31, 2019 and 2018, we had certain advances with embedded features that met the requirements to be separated from the host contract and designated as stand-alone derivatives.