Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net Income		$ 190,739,000	$ 216,769,000	$ 190,203,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		(19,937,000)	(1,192,000)	(12,892,000)
Provision for (reduction of ) credit losses		85,000	(34,000)	(96,000)
Change in net fair-value adjustments on derivatives and hedging activities		(284,002,000)	36,176,000	8,554,000
Net other-than-temporary impairment losses on investment securities, credit portion		1,212,000	532,000	1,454,000
Loss on early extinguishment of debt		15,238,000	0	0
Other adjustments		9,182,000	6,335,000	4,637,000
Realized net gain from sale of held-to-maturity securities	[1]	(12,031,000)	0	0
Net change in:
Market value of trading securities		(1,287,000)	4,515,000	6,078,000
Accrued interest receivable		588,000	(18,651,000)	(9,452,000)
Other assets		(7,510,000)	(2,627,000)	(3,147,000)
Accrued interest payable		(7,566,000)	21,417,000	9,804,000
Other liabilities		6,927,000	7,170,000	5,883,000
Total adjustments		(299,101,000)	53,641,000	10,823,000
Net cash (used in) provided by operating activities		(108,362,000)	270,410,000	201,026,000
INVESTING ACTIVITIES
Interest-bearing deposits		(776,421,000)	(629,887,000)	52,274,000
Securities purchased under agreements to resell		2,999,000,000	(1,150,000,000)	650,000,000
Federal funds sold		640,000,000	1,950,000,000	(750,000,000)
Loans to other FHLBanks		0	400,000,000	(400,000,000)
Trading securities:
Proceeds		177,340,000	779,652,000	1,032,652,000
Purchases		(2,263,279,000)	(749,072,000)	(618,051,000)
Available-for-sale securities:
Proceeds		1,714,800,000	1,409,776,000	1,462,091,000
Purchases		(3,206,255,000)	(12,800,000)	(2,222,738,000)
Held-to-maturity securities:
Proceeds		510,590,000	385,610,000	568,279,000
Advances to members:
Repaid		474,957,725,000	652,931,105,000	487,707,464,000
Originated		(466,272,505,000)	(658,551,866,000)	(486,239,305,000)
Mortgage loans held for portfolio:
Proceeds		590,161,000	414,690,000	472,636,000
Purchases		(803,765,000)	(719,845,000)	(794,914,000)
Other investing activities, net		(430,000)	1,454,000	748,000
Net Cash provided by (used in) investing activities		8,266,961,000	(3,541,183,000)	921,136,000
FINANCING ACTIVITIES
Net change in deposits		199,521,000	(2,071,000)	(5,594,000)
Net payments on derivatives with a financing element		(48,642,000)	0	(4,101,000)
Net proceeds from issuance of consolidated obligations:
Discount notes		144,030,097,000	198,660,164,000	170,645,541,000
Bonds		10,851,335,000	10,188,427,000	10,655,859,000
Payments for maturing and retiring consolidated obligations:
Discount notes		(149,400,564,000)	(193,351,448,000)	(172,999,084,000)
Bonds		(12,909,970,000)	(12,586,510,000)	(9,449,955,000)
Bonds transferred to other FHLBanks		(12,697,000)	0	0
Repayment of financing lease		(136,000)	0	0
Proceeds from issuance of capital stock		1,854,487,000	1,800,880,000	1,067,674,000
Payments for repurchase of capital stock		(2,514,211,000)	(1,555,438,000)	(1,186,589,000)
Payments for redemption of mandatorily redeemable capital stock		(26,062,000)	(4,364,000)	(5,434,000)
Cash dividends paid		(122,772,000)	(130,109,000)	(98,837,000)
Net cash (used in) provided by financing activities		(8,099,614,000)	3,019,531,000	(1,380,520,000)
Net increase (decrease) in cash and due from banks		58,985,000	(251,242,000)	(258,358,000)
Cash and due from banks at beginning of the year		10,431,000	261,673,000	520,031,000
Cash and due from banks at end of the year		69,416,000	10,431,000	261,673,000
Supplemental disclosures:
Interest paid		1,224,032,000	1,084,131,000	667,629,000
AHP payments		15,723,000	17,729,000	18,628,000
Noncash receipt of trading securities		0	6,624,000	0
Noncash transfers of mortgage loans held for portfolio to other assets		2,020,000	1,438,000	2,618,000
Lease liabilities arising from obtaining right-of-use assets		$ 12,572,000	$ 0	$ 0

[1] The securities sold had less than 15 percent of the acquired principal outstanding at the time of the sale. Such sales are treated as maturities for the purposes of security classification. The sale does not impact our ability and intent to hold the remaining investments classified as held-to-maturity through their stated maturity dates.