Advances - Outstanding by Year of Contractual Maturity or Next Call Date (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, Rolling Year, Par Value [Abstract]
Overdrawn demand-deposit accounts	$ 5,101	$ 12,332
Due in one year or less	25,116,961	32,748,467
Due after one year through two years	3,450,922	3,913,640
Due after two years through three years	1,949,499	2,672,290
Due after three years through four years	1,461,314	1,261,176
Due after four years through five years	1,309,679	1,362,468
Thereafter	1,290,411	1,298,012
Total par value	$ 34,583,887	$ 43,268,385