Advances - Interest-Rate-Payment Terms (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Fixed Rate [Abstract]
Due in one year or less - fixed rate	$ 18,733,966	$ 23,822,091
Due after one year - fixed rate	9,372,625	9,748,187
Total fixed-rate	28,106,591	33,570,278
Federal Home Loan Bank, Advances, Floating Rate [Abstract]
Due in one year or less - variable rate	243,601	219,832
Due after one year - variable rate	6,233,695	9,478,275
Total variable-rate	6,477,296	9,698,107
Total par value	$ 34,583,887	$ 43,268,385