Schedule of Long-term Debt by Call Feature (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Short-term and Long-term Debt [Line Items]
Par amounts for the FHLBanks' outstanding Consolidated Obligation	$ 819,900,000	$ 1,025,900,000
Bond premiums	100,567	85,028
Bond discounts	(7,683)	(8,350)
Concession fees	(4,810)	(6,118)
Hedging adjustments	37,333	33,047
Total book value	41,583,307	66,807,807
Long-term Debt, Gross	41,457,900	66,704,200
Fixed Interest Rate [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Long-term Debt, Gross	19,844,650	29,292,200
Step-up Interest Rate [Member] [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Long-term Debt, Gross	40,000	705,000
Variable interest rate [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Long-term Debt, Gross	$ 21,573,250	$ 36,707,000