Transactions with Related Parties (Statement of Income Effects) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Related Party Transaction [Line Items]
Interest income on advances	$ 95,201	$ 478,477	$ 548,953	$ 1,508,189
Interest Income on MPF loans	35,932	42,452	121,561	126,922
Letters of credit fees	1,405	322	1,688	1,875
Principal Owner [Member]
Related Party Transaction [Line Items]
Interest income on advances	91,749	280,009	362,346	980,227
Interest Income on MPF loans	6,101	6,774	19,021	21,603
Standby Letters of Credit | Principal Owner [Member]
Related Party Transaction [Line Items]
Letters of credit fees	$ 797	$ 1,333	$ 2,209	$ 4,446