Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES:
Net income	$ 151,792	$ 117,902
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,521	28,583
Net change in derivative and hedging activities	7,937	(36,990)
Net change in fair value adjustments on trading securities	4	(1)
Net change in fair value adjustments on financial instruments held under fair value option	12,458	32,947
Net change in:
Accrued interest receivable	(8,593)	(9,752)
Other assets	29,486	4,875
Accrued interest payable	2,723	17,189
Other liabilities	2,234	3,940
Total adjustments	70,770	40,791
Net cash provided by operating activities	222,562	158,693
Net change in:
Interest-bearing deposits	31,358	(96,178)
Securities purchased under agreements to resell	(636,212)	5,613,722
Federal funds sold	(2,773,000)	9,520,000
Premises, software, and equipment	(954)	(1,009)
Trading securities:
Proceeds from maturities of long-term	84	83
Available-for-sale securities:
Net decrease (increase) in short-term	950,000	(500,000)
Held-to-maturity securities:
Net (increase) decrease in short-term	(1,510)	1,672
Proceeds from maturities of long-term	1,067,947	1,297,615
Purchases of long-term	(1,695,542)	(1,091,090)
Advances:
Proceeds	1,061,870,216	591,327,098
Made	(1,063,075,660)	(592,545,989)
Mortgage loans held for portfolio:
Principal collected	605,081	679,892
Purchases	(925,134)	(1,232,995)
Net cash (used in) provided by investing activities	(4,583,326)	12,972,821
FINANCING ACTIVITIES:
Net (decrease) increase in deposits and pass-through reserves	(71,905)	100,600
Net payments on derivative contracts with financing elements	(2,898)	(7,640)
Net proceeds from issuance of Consolidated Obligations:
Discount Notes	293,476,586	173,693,969
Bonds	13,680,336	28,842,319
Payments for maturing and retiring Consolidated Obligations:
Discount Notes	(288,823,225)	(202,005,522)
Bonds	(13,505,000)	(13,522,053)
Proceeds from issuance of capital stock	250,196	35,663
Payments for repurchase/redemption of mandatorily redeemable capital stock	(186,218)	(179,929)
Cash dividends paid	(95,629)	(86,969)
Net cash provided by (used in) financing activities	4,722,243	(13,129,562)
Net increase in cash and cash equivalents	361,479	1,952
Cash and cash equivalents at beginning of the period	8,737	10,136
Cash and cash equivalents at end of the period	370,216	12,088
Supplemental Disclosures:
Interest paid	510,622	420,646
Affordable Housing Program payments, net	$ 14,548	$ 19,620