Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
OPERATING ACTIVITIES
Net Income		$ 41,655	$ 54,457
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		25,271	(174)
(Reduction of ) provision for credit losses		(684)	3
Net change in derivatives and hedging activities		(294,892)	(279,554)
Loss on early extinguishment of debt		0	9,865
Other adjustments		912	512
Realized net gain from sale of held-to-maturity securities	[1]	(40,733)	0
Net change in:
Market value of trading securities		(46,120)	274
Accrued interest receivable		2,285	6,528
Other assets		4,143	(3,228)
Accrued interest payable		3,533	22,593
Other liabilities		(9,862)	375
Total adjustments		(356,147)	(242,806)
Net cash used in operating activities		(314,492)	(188,349)
INVESTING ACTIVITIES
Interest-bearing deposits		23,464	49,939
Securities purchased under agreements to resell		1,500,000	749,000
Federal funds sold		(2,595,000)	(850,000)
Trading securities:
Proceeds		486	5,194
Purchases		(1,267,471)	0
Available-for-sale securities:
Proceeds		422,388	379,659
Held-to-maturity securities:
Proceeds		257,384	59,680
Advances to members:
Repaid		145,011,185	144,182,259
Originated		(155,343,704)	(133,106,358)
Mortgage loans held for portfolio:
Proceeds		181,907	84,505
Purchases		(215,458)	(155,055)
Other investing activities, net		841	(173)
Net cash (used in) provided by investing activities		(12,023,978)	11,398,650
FINANCING ACTIVITIES
Net change in deposits		186,175	79,824
Net payments on derivatives with a financing element		(107,123)	(4,002)
Net proceeds from issuance of consolidated obligations:
Discount notes		50,410,176	36,748,358
Bonds		3,733,068	1,548,338
Payments for maturing and retiring consolidated obligations:
Discount notes		(38,412,037)	(46,229,722)
Bonds		(3,107,595)	(2,585,153)
Proceeds from issuance of capital stock		1,466,215	281,392
Payments for repurchase of capital stock		(1,068,710)	(980,006)
Payments for redemption of mandatorily redeemable capital stock		0	(14,455)
Cash dividends paid		(24,130)	(37,272)
Net cash provided by (used in) financing activities		13,076,039	(11,192,698)
Net increase in cash and due from banks		737,569	17,603
Cash and due from banks at beginning of the period		69,416	10,431	$ 10,431
Cash and due from banks at end of the period		806,985	28,034	69,416
Supplemental disclosures:
Interest paid		245,004	317,374
AHP payments		4,672	2,281	$ 15,723
Noncash transfers of mortgage loans held for portfolio to other assets		363	405
Lease liabilities arising from obtaining right-of-use assets		$ 0	$ 11,946

[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.