Transactions with Related Parties (By Balance Sheet Grouping) (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Advances	[1]	$ 35,841,036	$ 65,610,075
Capital stock		1,880,371	3,054,996
Principal Owner [Member]
Related Party Transaction [Line Items]
Advances		15,976,534	34,748,867
Letters of credit	[2]	2,953,466	2,418,025
MPF loans		498,825	455,600
Deposits		22,395	17,904
Capital stock		$ 777,966	$ 1,574,659

[1] Amounts exclude accrued interest receivable of $49.2 million and $119.7 million at September 30, 2020 and December 31, 2019

[2] Letters of credit are off-balance sheet commitments.