Transactions with Other FHLBanks (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule of Other Transactions [Line Items]
Interest Income, Loans to Other Federal Home Loan Banks	$ 2,031	$ 744
Loans Made to Other FHLBanks [Roll Forward]
Loans to other FHLBanks, Beginning of period	0	35,000,000
Loans to other FHLBanks, End of period	0	0
Interest Expense, Loans from Other Federal Home Loan Banks	389	1,567
Borrowings From Other FHLBanks [Roll Forward]
Loans from other FHLBanks, Beginning of period	0	0
Loans from other FHLBanks, End of period	0	40,000,000
FHLBank of San Francisco [Member]
Loans Made to Other FHLBanks [Roll Forward]
Loans made to other FHLBanks	475,000,000	200,000,000
Collections from other FHLBanks	(475,000,000)	(200,000,000)
Borrowings From Other FHLBanks [Roll Forward]
Borrowings from other FHLBanks	200,000,000	420,000,000
Repayments to other FHLBanks	(200,000,000)	(420,000,000)
FHLBank of Atlanta [Member]
Loans Made to Other FHLBanks [Roll Forward]
Loans made to other FHLBanks	200,000,000	0
Collections from other FHLBanks	(200,000,000)	0
FHLBank of Seattle [Member]
Borrowings From Other FHLBanks [Roll Forward]
Borrowings from other FHLBanks	0	40,000,000
FHLBank of Topeka [Member]
Loans Made to Other FHLBanks [Roll Forward]
Collections from other FHLBanks	0	(35,000,000)
Borrowings From Other FHLBanks [Roll Forward]
Borrowings from other FHLBanks	0	40,000,000
Repayments to other FHLBanks	0	(40,000,000)
FHLBank of Indianapolis [Member]
Loans Made to Other FHLBanks [Roll Forward]
Loans made to other FHLBanks	377,000,000	0
Collections from other FHLBanks	$ (377,000,000)	$ 0