Federal Home Loan Bank of Cincinnati 10-Q 8 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Entity Registrant Name	FEDERAL HOME LOAN BANK OF CINCINNATI
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		36,499,570
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001326771
Current Fiscal Year End Date	--12-31
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false

Statements of Condition

Statements of Condition - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks		$ 21,771	$ 10,037
Interest-bearing deposits		375,120	122
Securities purchased under agreements to resell		3,301,185	4,402,208
Federal funds sold		13,680,000	10,793,000
Investment securities:
Trading securities		8,761,698	223,980
Available-for-sale securities		978,944	2,402,897
Held-to-maturity securities (includes $0 and $0 pledged as collateral at June 30, 2019 and December 31, 2018, respectively, that may be repledged) (a)	[1]	15,347,168	15,791,222
Total investment securities		25,087,810	18,418,099
Advances (includes $10,214 and $10,008 at fair value under fair value option at June 30, 2019 and December 31, 2018, respectively)		42,869,181	54,822,252
Mortgage loans held for portfolio, net of allowance for credit losses of $784 and $840 at June 30, 2019 and December 31, 2018, respectively		10,638,689	10,500,917
Accrued interest receivable		201,154	169,982
Derivative assets		228,039	65,765
Other assets		21,521	20,191
TOTAL ASSETS		96,424,470	99,202,573
LIABILITIES
Deposits		717,325	669,016
Consolidated Obligations:
Discount Notes		41,492,853	46,943,632
Bonds (includes $8,071,128 and $3,906,610 at fair value under fair value option at June 30, 2019 and December 31, 2018, respectively)		48,780,417	45,659,138
Total Consolidated Obligations		90,273,270	92,602,770
Mandatorily redeemable capital stock		22,561	23,184
Accrued interest payable		159,960	147,337
Affordable Housing Program payable		118,406	117,336
Derivative liabilities		3,094	4,586
Other liabilities		298,741	308,128
Total liabilities		91,593,357	93,872,357
Commitments and contingencies
CAPITAL
Capital stock Class B putable ($100 par value); issued and outstanding shares: 38,065 shares at June 30, 2019 and 43,205 shares at December 31, 2018		3,806,530	4,320,459
Retained earnings:
Unrestricted		618,634	631,971
Restricted		418,325	390,829
Total retained earnings		1,036,959	1,022,800
Accumulated other comprehensive loss		(12,376)	(13,043)
Total capital		4,831,113	5,330,216
TOTAL LIABILITIES AND CAPITAL		$ 96,424,470	$ 99,202,573
[1]	Fair values: $15,329,536 and $15,575,368 at June 30, 2019 and December 31, 2018 , respectively.

Statements of Condition (Parent

Statements of Condition (Parenthetical) - USD ($) shares in Thousands, $ in Thousands		Jun. 30, 2019		Dec. 31, 2018
Debt Securities, Held-to-maturity, Restricted		$ 0		$ 0
Advances, Fair Value Disclosure	[1]	10,214		10,008
Allowance for credit losses on mortgage loans		$ 784		$ 840
Common Stock, Par or Stated Value Per Share		$ 100		$ 100
Common Stock, Shares, Issued		38,065		43,205
Common Stock, Shares, Outstanding		38,065		43,205
Debt Securities, Held-to-maturity, Fair Value		$ 15,329,536		$ 15,575,368
Debt Securities, Held-to-maturity, Restricted [Extensible List]		us-gaap:CollateralPledgedMember
Consolidated Obligation Bonds [Member]
Consolidated Obligations, Bonds		$ 8,071,128		3,906,610
Fair Value
Debt Securities, Held-to-maturity, Fair Value		15,329,536		15,575,368
Fair Value | Consolidated Obligation Bonds [Member]
Consolidated Obligations, Bonds		$ 49,077,406	[2]	$ 45,385,615	[3]
[1]	At June 30, 2019 and December 31, 2018 , none of the Advances were 90 days or more past due or had been placed on non-accrual status.
[2]	Includes (in thousands) $8,071,128 of Consolidated Obligation Bonds recorded under the fair value option at June 30, 2019 .
[3]	Includes (in thousands) $3,906,610 of Consolidated Obligation Bonds recorded under the fair value option at December 31, 2018 .

Statements of Income

Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
INTEREST INCOME:
Advances	$ 320,763	$ 349,054	$ 723,540	$ 667,475
Prepayment fees on Advances, net	165	421	180	461
Interest-bearing deposits	3,737	152	5,281	255
Securities purchased under agreements to resell	22,223	10,310	41,048	17,267
Federal funds sold	59,192	51,275	123,021	86,013
Investment securities:
Trading securities	45,389	5	50,560	10
Available-for-sale securities	4,854	10,176	18,413	13,455
Held-to-maturity securities	103,979	94,857	210,452	177,777
Total investment securities	154,222	105,038	279,425	191,242
Mortgage loans held for portfolio	85,587	77,675	174,252	155,421
Loans to other FHLBanks	50	0	70	20
Total interest income	645,939	593,925	1,346,817	1,118,154
Consolidated Obligations:
Discount Notes	244,185	215,069	555,895	396,440
Bonds	300,060	246,739	562,923	469,207
Total Consolidated Obligations	544,245	461,808	1,118,818	865,647
Deposits	3,973	2,566	7,671	4,451
Loans from other FHLBanks	0	5	0	5
Mandatorily redeemable capital stock	293	355	642	800
Total interest expense	548,511	464,734	1,127,131	870,903
NET INTEREST INCOME	97,428	129,191	219,686	247,251
NON-INTEREST INCOME (LOSS):
Net gains (losses) on investment securities	171,461	(3)	193,587	(5)
Net gains (losses) on financial instruments held under fair value option	(24,753)	(3,894)	(41,934)	15,831
Net gains (losses) on derivatives and hedging activities	(152,126)		(178,085)
Net gains (losses) on derivatives and hedging activities		(11,592)		(37,965)
Other, net	2,759	2,680	5,374	5,473
Total non-interest income (loss)	(2,659)	(12,809)	(21,058)	(16,666)
NON-INTEREST EXPENSE:
Compensation and benefits	11,376	11,457	24,035	24,150
Other operating expenses	5,468	4,967	10,945	10,095
Finance Agency	1,695	1,565	3,391	3,129
Office of Finance	1,114	1,097	2,480	2,434
Other	3,725	3,055	4,950	4,457
Total non-interest expense	23,378	22,141	45,801	44,265
INCOME BEFORE ASSESSMENTS	71,391	94,241	152,827	186,320
Affordable Housing Program assessments	7,168	9,460	15,347	18,712
NET INCOME	$ 64,223	$ 84,781	$ 137,480	$ 167,608

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income	$ 64,223	$ 84,781	$ 137,480	$ 167,608
Other comprehensive income adjustments:
Net unrealized gains (losses) on available-for-sale securities	(437)	201	(250)	344
Pension and postretirement benefits	516	487	917	973
Total other comprehensive income (loss) adjustments	79	688	667	1,317
Comprehensive income	$ 64,302	$ 85,469	$ 138,147	$ 168,925

Statements of Capital

Statements of Capital - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 5,077,110	$ 5,468,947	$ 5,330,216	$ 5,164,513
Comprehensive Income	64,302	85,469	138,147	168,925
Proceeds from sale of capital stock, par value	147,687	13,417	375,793	295,832
Repurchase of capital stock, value	(400,000)		(888,544)
Net shares reclassified to mandatorily redeemable capital stock, par value	(138)	2,208	(1,178)	2,143
Cash dividends on capital stock	(57,848)	(62,566)	(123,321)	(123,938)
Ending balance	$ 4,831,113	$ 5,507,475	$ 4,831,113	$ 5,507,475
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, Issued beginning balance	40,590	45,235	43,205	42,411
Proceeds from sale of capital stock, shares	1,477	134	3,758	2,958
Repurchase of capital stock, shares	(4,000)		(8,886)
Net shares reclassified to mandatorily redeemable capital stock, shares	(2)	22	(12)	22
Shares, Issued ending balance	38,065	45,391	38,065	45,391
Beginning balance	$ 4,058,981	$ 4,523,490	$ 4,320,459	$ 4,241,140
Proceeds from sale of capital stock, par value	147,687	13,417	375,793	295,832
Repurchase of capital stock, value	(400,000)		(888,544)
Net shares reclassified to mandatorily redeemable capital stock, par value	(138)	2,208	(1,178)	2,143
Ending balance	3,806,530	4,539,115	3,806,530	4,539,115
Retained Earnings, Unrestricted [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	625,103	621,924	631,971	617,034
Comprehensive Income	51,379	67,824	109,984	134,086
Cash dividends on capital stock	(57,848)	(62,566)	(123,321)	(123,938)
Ending balance	618,634	627,182	618,634	627,182
Retained Earnings, Restricted [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	405,481	339,564	390,829	322,999
Comprehensive Income	12,844	16,957	27,496	33,522
Ending balance	418,325	356,521	418,325	356,521
Retained Earnings, Total [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,030,584	961,488	1,022,800	940,033
Comprehensive Income	64,223	84,781	137,480	167,608
Cash dividends on capital stock	(57,848)	(62,566)	(123,321)	(123,938)
Ending balance	1,036,959	983,703	1,036,959	983,703
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(12,455)	(16,031)	(13,043)	(16,660)
Comprehensive Income	79	688	667	1,317
Ending balance	$ (12,376)	$ (15,343)	$ (12,376)	$ (15,343)

Statements of Cash Flows

Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
OPERATING ACTIVITIES:
Net income	$ 137,480	$ 167,608
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,241	42,682
Net change in derivative and hedging activities	(151,533)	44,713
Net change in fair value adjustments on trading securities	(193,587)	5
Net change in fair value adjustments on financial instruments held under fair value option	41,934	(15,831)
Other adjustments	386	0
Net change in:
Accrued interest receivable	(31,419)	(58,868)
Other assets	4,813	6,378
Accrued interest payable	29,128	5,995
Other liabilities	3,694	10,312
Total adjustments	(273,343)	35,386
Net cash provided by (used in) operating activities	(135,863)	202,994
Net change in:
Interest-bearing deposits	(554,112)	(1,247)
Securities purchased under agreements to resell	1,101,023	3,568,607
Federal funds sold	(2,887,000)	(10,020,000)
Premises, software, and equipment	(1,244)	(1,248)
Trading securities:
Proceeds from maturities	74	87
Purchases	(8,344,204)	0
Available-for-sale securities:
Proceeds from maturities	(3,300,000)	(1,400,000)
Purchases	(1,886,000)	(3,400,000)
Held-to-maturity securities:
Proceeds from maturities	1,385,566	1,313,650
Purchases	(945,214)	(3,312,256)
Advances:
Repaid	756,877,187	1,747,810,892
Originated	(744,759,498)	(1,738,498,377)
Mortgage loans held for portfolio:
Principal collected	653,475	547,468
Purchases	(801,061)	(732,583)
Net cash provided by (used in) investing activities	3,138,992	(1,325,007)
FINANCING ACTIVITIES:
Net change in deposits and pass-through reserves	39,939	95,110
Net proceeds (payments) on derivative contracts with financing elements	(221)	(693)
Net proceeds from issuance of Consolidated Obligations:
Discount Notes	295,761,694	282,305,387
Bonds	19,473,745	14,027,224
Payments for maturing and retiring Consolidated Obligations:
Discount Notes	(301,226,879)	(278,490,713)
Bonds	(16,401,800)	(16,992,425)
Proceeds from issuance of capital stock	375,793	295,832
Payments for repurchase of capital stock	(888,544)	0
Payments for repurchase/redemption of mandatorily redeemable capital stock	(1,801)	(4,647)
Cash dividends paid	(123,321)	(123,938)
Net cash provided by (used in) financing activities	(2,991,395)	1,111,137
Net increase (decrease) in cash and due from banks	11,734	(10,876)
Cash and due from banks at beginning of the period	10,037	26,550
Cash and due from banks at end of the period	21,771	15,674
Supplemental Disclosures:
Interest paid	1,096,849	836,775
Affordable Housing Program payments, net	$ 14,277	$ 11,365

Background Information

Background Information	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations [Text Block]	Background Information The Federal Home Loan Bank of Cincinnati (the FHLB), a federally chartered corporation, is one of 11 District Federal Home Loan Banks (FHLBanks). The FHLBanks are government-sponsored enterprises (GSEs) that serve the public by enhancing the availability of credit for residential mortgages and targeted community development. The FHLB is regulated by the Federal Housing Finance Agency (Finance Agency).

Basis of Presentation (Notes)

Basis of Presentation (Notes)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting [Text Block]	Basis of Presentation The accompanying interim financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The preparation of financial statements in accordance with GAAP requires management to make assumptions and estimates. These assumptions and estimates affect the reported amount of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of income and expenses. Actual results could differ from these estimates. The interim financial statements presented are unaudited, but they include all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of the financial condition, results of operations, and cash flows for such periods. These financial statements do not include all disclosures associated with annual financial statements and accordingly should be read in conjunction with the audited financial statements and notes included in the FHLB's Annual Report on Form 10-K for the year ended December 31, 2018 filed with the Securities and Exchange Commission (SEC). Results for the six months ended June 30, 2019 are not necessarily indicative of operating results for the full year. The FHLB presents certain financial instruments, including derivative instruments and securities purchased under agreements to resell, on a net basis when it has a legal right of offset and all other requirements for netting are met (collectively referred to as the netting requirements). For these instruments, the FHLB has elected to offset its asset and liability positions, as well as cash collateral received or pledged, when it has met the netting requirements. The FHLB did not have any offsetting liabilities related to its securities purchased under agreements to resell for the periods presented. The net exposure for these financial instruments can change on a daily basis; therefore, there may be a delay between the time this exposure change is identified and additional collateral is requested, and the time this collateral is received or pledged. Likewise, there may be a delay for excess collateral to be returned. For derivative instruments that meet the requirements for netting, any excess cash collateral received or pledged is recognized as a derivative liability or derivative asset. Additional information regarding these agreements is provided in Note 10. Based on the fair value of the related collateral held, the securities purchased under agreements to resell were fully collateralized for the periods presented. For more information about the FHLB's investments in securities purchased under agreements to resell, see “Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies” in the FHLB's 2018 Annual Report on Form 10-K. The FHLB did not hold any equity securities as of June 30, 2019 and December 31, 2018 . Reclassifications. Certain amounts in the 2018 financial statements have been reclassified to conform to the presentation as of June 30, 2019 . Specifically, certain cash flow amounts in the prior period Statement of Cash Flows have been reclassified to reflect short-term investment securities purchases and proceeds on a gross, rather than net, basis. Subsequent Events. The FHLB has evaluated subsequent events for potential recognition or disclosure through the issuance of these financial statements and believes there have been no material subsequent events requiring additional disclosure or recognition in these financial statements.

Recently Issued Accounting Stan

Recently Issued Accounting Standards and Interpretations	6 Months Ended
	Jun. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recently Issued Accounting Standards and Interpretations [Text Block]	Recently Issued Accounting Standards and Interpretations Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. On October 25, 2018, the Financial Accounting Standards Board (FASB) issued guidance that permits the OIS rate based on SOFR as an eligible U.S. benchmark interest rate for hedge accounting purposes, to facilitate the London InterBank Offered Rate (LIBOR) to SOFR transition. This guidance became effective for the FHLB for the interim and annual periods beginning on January 1, 2019 (concurrent with the adoption of the hedging standard mentioned below). This guidance was adopted prospectively for qualifying new or re-designated hedging relationships entered into on or after January 1, 2019. Upon adoption, this guidance did not have an impact on the FHLB’s financial condition, results of operations, or cash flows. Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. On August 29, 2018, the FASB issued amended guidance that aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). This guidance becomes effective for the FHLB for the interim and annual periods beginning on January 1, 2020. Early adoption is permitted. The FHLB does not intend to adopt this guidance early. The FHLB is in the process of evaluating this guidance, but its effect on the FHLB’s financial condition, results of operations, or cash flows is not expected to be material. Changes to the Disclosure Requirements for Defined Benefit Plans. On August 28, 2018, the FASB issued amended guidance that modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans to improve disclosure effectiveness. This guidance becomes effective for annual periods ending after December 15, 2020 (December 31, 2020 for the FHLB) and will be applied retrospectively for all comparative periods presented. Early adoption is permitted. The FHLB does not intend to adopt this guidance early. The adoption of this guidance will affect the FHLB's disclosures, but will not have any effect on the FHLB's financial condition, results of operations, or cash flows. Changes to the Disclosure Requirements for Fair Value Measurement. On August 28, 2018, the FASB issued amended guidance that modifies the disclosure requirements for fair value measurements to improve disclosure effectiveness. This guidance becomes effective for the FHLB for the interim and annual periods beginning on January 1, 2020. Early adoption is permitted. The FHLB does not intend to adopt this guidance early. The adoption of this guidance will affect the FHLB's disclosures, but will not have any effect on the FHLB's financial condition, results of operations, or cash flows. Targeted Improvements to Accounting for Hedging Activities. On August 28, 2017, the FASB issued amended guidance to improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. This guidance requires that, for fair value hedges, the entire change in the fair value of the hedging instrument included in the assessment of hedge effectiveness be presented in the same income statement line that is used to present the earnings effect of the hedged item. In addition, the amendments include certain targeted improvements to the assessment of hedge effectiveness. This guidance became effective for the FHLB for the interim and annual periods beginning on January 1, 2019 and was applied to all existing hedging relationships as of that date. On January 1, 2019, the FHLB modified the presentation of fair value hedge results on its Statements of Income, as well as relevant disclosures, prospectively. However, the adoption of this guidance did not have a material effect on the FHLB's financial condition, results of operations, or cash flows. Premium Amortization on Purchased Callable Debt Securities. On March 30, 2017, the FASB issued amended guidance to shorten the amortization period for certain purchased callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. This guidance was adopted on January 1, 2019, and is applied using a modified retrospective method through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The guidance did not have an impact on the FHLB’s financial condition, results of operations, or cash flows. Measurement of Credit Losses on Financial Instruments. On June 16, 2016, the FASB issued amended guidance for the accounting of credit losses on financial instruments. The amendments require entities to immediately record the full amount of expected credit losses in their loan portfolios. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The guidance also requires, among other things, credit losses relating to available-for-sale debt securities to be recorded through an allowance for credit losses and expanded disclosure requirements. The guidance becomes effective for the FHLB for the interim and annual periods beginning on January 1, 2020. Early adoption is permitted. The FHLB does not intend to adopt the new guidance early. The guidance should be applied using a modified-retrospective approach, through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. In addition, entities are required to use a prospective transition approach for debt securities for which an other-than-temporary impairment had been recognized before the effective date. Based on its preliminary assessments, the FHLB does not expect the guidance to result in an allowance for credit losses for certain financial instruments including Advances, U.S. obligation/GSE investments, securities purchased under agreement to resell and other short-term investments given the specific terms, issuer guarantees, and/or collateralized/secured nature of the instruments. For mortgage loans held for portfolio, the FHLB does not expect the guidance to have a material impact. However, the FHLB's expectation of the guidance's ultimate impact on its financial condition, results of operations, and cash flows may change depending upon the composition of the FHLB’s financial assets at the adoption date and the economic conditions and forecasts at that time. Leases. On February 25, 2016, the FASB issued guidance that requires recognition of lease assets and lease liabilities on the Statement of Condition and disclosure of key information about leasing arrangements. In particular, this guidance requires a lessee, of operating or finance leases, to recognize on the Statement of Condition a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. This guidance became effective for the FHLB for the interim and annual periods beginning on January 1, 2019. The FHLB elected to adopt this guidance using the modified retrospective method, and therefore, did not restate prior periods. On January 1, 2019, the FHLB recognized a right-of-use asset of $ 5,473,000 in other assets and a lease liability of $ 6,141,000 in other liabilities on its Statement of Condition for its operating leases. As permitted, the FHLB elected to not recognize a right-of-use asset or lease liability for its leases with terms of 12 months or less. The FHLB has determined that its leasing activities are not material to its financial condition, results of operations, or cash flows.

Trading Securities

Trading Securities	6 Months Ended
	Jun. 30, 2019
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Trading Securities Table 3.1 - Trading Securities by Major Security Types (in thousands) Fair Value June 30, 2019 December 31, 2018 Non-mortgage-backed securities (non-MBS): U.S. Treasury obligations $ 7,055,007 $ — GSE obligations 1,706,153 223,368 Total non-MBS 8,761,160 223,368 Mortgage-backed securities (MBS): U.S. obligation single-family MBS 538 612 Total $ 8,761,698 $ 223,980 Table 3.2 - Net Gains (Losses) on Trading Securities (in thousands) Six Months Ended June 30, 2019 2018 Net gains (losses) on trading securities held at period end $ 193,587 $ (5 ) Net gains (losses) on trading securities $ 193,587 $ (5 ) Table 4.1 - Available-for-Sale Securities by Major Security Types (in thousands) June 30, 2019 Amortized Cost (1) Gross Unrealized Gains Gross Unrealized Losses Fair Value Certificates of deposit $ 850,000 $ 35 $ — $ 850,035 GSE obligations 129,304 138 (533 ) 128,909 Total $ 979,304 $ 173 $ (533 ) $ 978,944 December 31, 2018 Amortized Cost (1) Gross Unrealized Gains Gross Unrealized Losses Fair Value Certificates of deposit $ 2,350,000 $ 71 $ (69 ) $ 2,350,002 GSE obligations 53,007 16 (128 ) 52,895 Total $ 2,403,007 $ 87 $ (197 ) $ 2,402,897 (1) Amortized cost of available-for-sale securities includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments. All securities outstanding with gross unrealized losses at June 30, 2019 and December 31, 2018 were in a continuous unrealized loss position for less than 12 months. Table 4.2 - Available-for-Sale Securities by Contractual Maturity (in thousands) June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost Fair Value Amortized Cost Fair Value Due in 1 year or less $ 850,000 $ 850,035 $ 2,350,000 $ 2,350,002 Due after 1 year through 5 years — — — — Due after 5 years through 10 years 119,695 119,202 48,999 48,904 Due after 10 years 9,609 9,707 4,008 3,991 Total $ 979,304 $ 978,944 $ 2,403,007 $ 2,402,897 Table 4.3 - Interest Rate Payment Terms of Available-for-Sale Securities (in thousands) June 30, 2019 December 31, 2018 Amortized cost of available-for-sale securities: Fixed-rate $ 979,304 $ 2,403,007 Realized Gains and Losses. The FHLB had no sales of securities out of its available-for-sale portfolio for the six months ended June 30, 2019 or 2018 . Table 5.1 - Held-to-Maturity Securities by Major Security Types (in thousands) June 30, 2019 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value Non-MBS: U.S. Treasury obligations $ 34,760 $ 4 $ — $ 34,764 Total non-MBS 34,760 4 — 34,764 MBS: U.S. obligation single-family MBS 1,871,911 5,903 (608 ) 1,877,206 GSE single-family MBS 5,082,144 34,934 (38,252 ) 5,078,826 GSE multi-family MBS 8,358,353 652 (20,265 ) 8,338,740 Total MBS 15,312,408 41,489 (59,125 ) 15,294,772 Total $ 15,347,168 $ 41,493 $ (59,125 ) $ 15,329,536 December 31, 2018 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value Non-MBS: U.S. Treasury obligations $ 35,667 $ — $ (6 ) $ 35,661 Total non-MBS 35,667 — (6 ) 35,661 MBS: U.S. obligation single-family MBS 2,040,642 540 (47,463 ) 1,993,719 GSE single-family MBS 5,543,524 9,891 (162,097 ) 5,391,318 GSE multi-family MBS 8,171,389 1,739 (18,458 ) 8,154,670 Total MBS 15,755,555 12,170 (228,018 ) 15,539,707 Total $ 15,791,222 $ 12,170 $ (228,024 ) $ 15,575,368 (1) Carrying value equals amortized cost. Table 5.2 - Net Purchased Premiums Included in the Amortized Cost of MBS Classified as Held-to-Maturity (in thousands) June 30, 2019 December 31, 2018 Premiums $ 36,886 $ 42,299 Discounts (16,248 ) (19,730 ) Net purchased premiums $ 20,638 $ 22,569 Table 5.3 summarizes the held-to-maturity securities with unrealized losses, which are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position. Table 5.3 - Held-to-Maturity Securities in a Continuous Unrealized Loss Position (in thousands) June 30, 2019 Less than 12 Months 12 Months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses MBS: U.S. obligation single-family MBS $ 45,099 $ (6 ) $ 219,830 $ (602 ) $ 264,929 $ (608 ) GSE single-family MBS 23,675 (30 ) 3,041,562 (38,222 ) 3,065,237 (38,252 ) GSE multi-family MBS 4,431,699 (12,341 ) 2,581,943 (7,924 ) 7,013,642 (20,265 ) Total $ 4,500,473 $ (12,377 ) $ 5,843,335 $ (46,748 ) $ 10,343,808 $ (59,125 ) December 31, 2018 Less than 12 Months 12 Months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-MBS: U.S. Treasury obligations $ 35,661 $ (6 ) $ — $ — $ 35,661 $ (6 ) Total non-MBS 35,661 (6 ) — — 35,661 (6 ) MBS: U.S. obligation single-family MBS 175,663 (1,571 ) 1,526,835 (45,892 ) 1,702,498 (47,463 ) GSE single-family MBS 401,509 (1,581 ) 3,859,608 (160,516 ) 4,261,117 (162,097 ) GSE multi-family MBS 5,976,323 (18,185 ) 229,739 (273 ) 6,206,062 (18,458 ) Total MBS 6,553,495 (21,337 ) 5,616,182 (206,681 ) 12,169,677 (228,018 ) Total $ 6,589,156 $ (21,343 ) $ 5,616,182 $ (206,681 ) $ 12,205,338 $ (228,024 ) Table 5.4 - Held-to-Maturity Securities by Contractual Maturity (in thousands) June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost (1) Fair Value Amortized Cost (1) Fair Value Non-MBS: Due in 1 year or less $ 34,760 $ 34,764 $ 35,667 $ 35,661 Due after 1 year through 5 years — — — — Due after 5 years through 10 years — — — — Due after 10 years — — — — Total non-MBS 34,760 34,764 35,667 35,661 MBS (2) 15,312,408 15,294,772 15,755,555 15,539,707 Total $ 15,347,168 $ 15,329,536 $ 15,791,222 $ 15,575,368 (1) Carrying value equals amortized cost. (2) MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees. Table 5.5 - Interest Rate Payment Terms of Held-to-Maturity Securities (in thousands) June 30, 2019 December 31, 2018 Amortized cost of non-MBS: Fixed-rate $ 34,760 $ 35,667 Total amortized cost of non-MBS 34,760 35,667 Amortized cost of MBS: Fixed-rate 6,112,467 6,652,055 Variable-rate 9,199,941 9,103,500 Total amortized cost of MBS 15,312,408 15,755,555 Total $ 15,347,168 $ 15,791,222 Realized Gains and Losses. From time to time the FHLB may sell securities out of its held-to-maturity portfolio. These securities, generally, have less than 15 percent of the acquired principal outstanding at the time of the sale. These sales are considered maturities for the purposes of security classification. For the six months ended June 30, 2019 and 2018, the FHLB did not sell any held-to-maturity securities.

Available-for-Sale Securities

Available-for-Sale Securities	6 Months Ended
	Jun. 30, 2019
Debt Securities, Available-for-sale [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Trading Securities Table 3.1 - Trading Securities by Major Security Types (in thousands) Fair Value June 30, 2019 December 31, 2018 Non-mortgage-backed securities (non-MBS): U.S. Treasury obligations $ 7,055,007 $ — GSE obligations 1,706,153 223,368 Total non-MBS 8,761,160 223,368 Mortgage-backed securities (MBS): U.S. obligation single-family MBS 538 612 Total $ 8,761,698 $ 223,980 Table 3.2 - Net Gains (Losses) on Trading Securities (in thousands) Six Months Ended June 30, 2019 2018 Net gains (losses) on trading securities held at period end $ 193,587 $ (5 ) Net gains (losses) on trading securities $ 193,587 $ (5 ) Table 4.1 - Available-for-Sale Securities by Major Security Types (in thousands) June 30, 2019 Amortized Cost (1) Gross Unrealized Gains Gross Unrealized Losses Fair Value Certificates of deposit $ 850,000 $ 35 $ — $ 850,035 GSE obligations 129,304 138 (533 ) 128,909 Total $ 979,304 $ 173 $ (533 ) $ 978,944 December 31, 2018 Amortized Cost (1) Gross Unrealized Gains Gross Unrealized Losses Fair Value Certificates of deposit $ 2,350,000 $ 71 $ (69 ) $ 2,350,002 GSE obligations 53,007 16 (128 ) 52,895 Total $ 2,403,007 $ 87 $ (197 ) $ 2,402,897 (1) Amortized cost of available-for-sale securities includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments. All securities outstanding with gross unrealized losses at June 30, 2019 and December 31, 2018 were in a continuous unrealized loss position for less than 12 months. Table 4.2 - Available-for-Sale Securities by Contractual Maturity (in thousands) June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost Fair Value Amortized Cost Fair Value Due in 1 year or less $ 850,000 $ 850,035 $ 2,350,000 $ 2,350,002 Due after 1 year through 5 years — — — — Due after 5 years through 10 years 119,695 119,202 48,999 48,904 Due after 10 years 9,609 9,707 4,008 3,991 Total $ 979,304 $ 978,944 $ 2,403,007 $ 2,402,897 Table 4.3 - Interest Rate Payment Terms of Available-for-Sale Securities (in thousands) June 30, 2019 December 31, 2018 Amortized cost of available-for-sale securities: Fixed-rate $ 979,304 $ 2,403,007 Realized Gains and Losses. The FHLB had no sales of securities out of its available-for-sale portfolio for the six months ended June 30, 2019 or 2018 . Table 5.1 - Held-to-Maturity Securities by Major Security Types (in thousands) June 30, 2019 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value Non-MBS: U.S. Treasury obligations $ 34,760 $ 4 $ — $ 34,764 Total non-MBS 34,760 4 — 34,764 MBS: U.S. obligation single-family MBS 1,871,911 5,903 (608 ) 1,877,206 GSE single-family MBS 5,082,144 34,934 (38,252 ) 5,078,826 GSE multi-family MBS 8,358,353 652 (20,265 ) 8,338,740 Total MBS 15,312,408 41,489 (59,125 ) 15,294,772 Total $ 15,347,168 $ 41,493 $ (59,125 ) $ 15,329,536 December 31, 2018 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value Non-MBS: U.S. Treasury obligations $ 35,667 $ — $ (6 ) $ 35,661 Total non-MBS 35,667 — (6 ) 35,661 MBS: U.S. obligation single-family MBS 2,040,642 540 (47,463 ) 1,993,719 GSE single-family MBS 5,543,524 9,891 (162,097 ) 5,391,318 GSE multi-family MBS 8,171,389 1,739 (18,458 ) 8,154,670 Total MBS 15,755,555 12,170 (228,018 ) 15,539,707 Total $ 15,791,222 $ 12,170 $ (228,024 ) $ 15,575,368 (1) Carrying value equals amortized cost. Table 5.2 - Net Purchased Premiums Included in the Amortized Cost of MBS Classified as Held-to-Maturity (in thousands) June 30, 2019 December 31, 2018 Premiums $ 36,886 $ 42,299 Discounts (16,248 ) (19,730 ) Net purchased premiums $ 20,638 $ 22,569 Table 5.3 summarizes the held-to-maturity securities with unrealized losses, which are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position. Table 5.3 - Held-to-Maturity Securities in a Continuous Unrealized Loss Position (in thousands) June 30, 2019 Less than 12 Months 12 Months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses MBS: U.S. obligation single-family MBS $ 45,099 $ (6 ) $ 219,830 $ (602 ) $ 264,929 $ (608 ) GSE single-family MBS 23,675 (30 ) 3,041,562 (38,222 ) 3,065,237 (38,252 ) GSE multi-family MBS 4,431,699 (12,341 ) 2,581,943 (7,924 ) 7,013,642 (20,265 ) Total $ 4,500,473 $ (12,377 ) $ 5,843,335 $ (46,748 ) $ 10,343,808 $ (59,125 ) December 31, 2018 Less than 12 Months 12 Months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-MBS: U.S. Treasury obligations $ 35,661 $ (6 ) $ — $ — $ 35,661 $ (6 ) Total non-MBS 35,661 (6 ) — — 35,661 (6 ) MBS: U.S. obligation single-family MBS 175,663 (1,571 ) 1,526,835 (45,892 ) 1,702,498 (47,463 ) GSE single-family MBS 401,509 (1,581 ) 3,859,608 (160,516 ) 4,261,117 (162,097 ) GSE multi-family MBS 5,976,323 (18,185 ) 229,739 (273 ) 6,206,062 (18,458 ) Total MBS 6,553,495 (21,337 ) 5,616,182 (206,681 ) 12,169,677 (228,018 ) Total $ 6,589,156 $ (21,343 ) $ 5,616,182 $ (206,681 ) $ 12,205,338 $ (228,024 ) Table 5.4 - Held-to-Maturity Securities by Contractual Maturity (in thousands) June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost (1) Fair Value Amortized Cost (1) Fair Value Non-MBS: Due in 1 year or less $ 34,760 $ 34,764 $ 35,667 $ 35,661 Due after 1 year through 5 years — — — — Due after 5 years through 10 years — — — — Due after 10 years — — — — Total non-MBS 34,760 34,764 35,667 35,661 MBS (2) 15,312,408 15,294,772 15,755,555 15,539,707 Total $ 15,347,168 $ 15,329,536 $ 15,791,222 $ 15,575,368 (1) Carrying value equals amortized cost. (2) MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees. Table 5.5 - Interest Rate Payment Terms of Held-to-Maturity Securities (in thousands) June 30, 2019 December 31, 2018 Amortized cost of non-MBS: Fixed-rate $ 34,760 $ 35,667 Total amortized cost of non-MBS 34,760 35,667 Amortized cost of MBS: Fixed-rate 6,112,467 6,652,055 Variable-rate 9,199,941 9,103,500 Total amortized cost of MBS 15,312,408 15,755,555 Total $ 15,347,168 $ 15,791,222 Realized Gains and Losses. From time to time the FHLB may sell securities out of its held-to-maturity portfolio. These securities, generally, have less than 15 percent of the acquired principal outstanding at the time of the sale. These sales are considered maturities for the purposes of security classification. For the six months ended June 30, 2019 and 2018, the FHLB did not sell any held-to-maturity securities.

Held-to-Maturity Securities

Held-to-Maturity Securities	6 Months Ended
	Jun. 30, 2019
Debt Securities, Held-to-maturity [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Trading Securities Table 3.1 - Trading Securities by Major Security Types (in thousands) Fair Value June 30, 2019 December 31, 2018 Non-mortgage-backed securities (non-MBS): U.S. Treasury obligations $ 7,055,007 $ — GSE obligations 1,706,153 223,368 Total non-MBS 8,761,160 223,368 Mortgage-backed securities (MBS): U.S. obligation single-family MBS 538 612 Total $ 8,761,698 $ 223,980 Table 3.2 - Net Gains (Losses) on Trading Securities (in thousands) Six Months Ended June 30, 2019 2018 Net gains (losses) on trading securities held at period end $ 193,587 $ (5 ) Net gains (losses) on trading securities $ 193,587 $ (5 ) Table 4.1 - Available-for-Sale Securities by Major Security Types (in thousands) June 30, 2019 Amortized Cost (1) Gross Unrealized Gains Gross Unrealized Losses Fair Value Certificates of deposit $ 850,000 $ 35 $ — $ 850,035 GSE obligations 129,304 138 (533 ) 128,909 Total $ 979,304 $ 173 $ (533 ) $ 978,944 December 31, 2018 Amortized Cost (1) Gross Unrealized Gains Gross Unrealized Losses Fair Value Certificates of deposit $ 2,350,000 $ 71 $ (69 ) $ 2,350,002 GSE obligations 53,007 16 (128 ) 52,895 Total $ 2,403,007 $ 87 $ (197 ) $ 2,402,897 (1) Amortized cost of available-for-sale securities includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments. All securities outstanding with gross unrealized losses at June 30, 2019 and December 31, 2018 were in a continuous unrealized loss position for less than 12 months. Table 4.2 - Available-for-Sale Securities by Contractual Maturity (in thousands) June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost Fair Value Amortized Cost Fair Value Due in 1 year or less $ 850,000 $ 850,035 $ 2,350,000 $ 2,350,002 Due after 1 year through 5 years — — — — Due after 5 years through 10 years 119,695 119,202 48,999 48,904 Due after 10 years 9,609 9,707 4,008 3,991 Total $ 979,304 $ 978,944 $ 2,403,007 $ 2,402,897 Table 4.3 - Interest Rate Payment Terms of Available-for-Sale Securities (in thousands) June 30, 2019 December 31, 2018 Amortized cost of available-for-sale securities: Fixed-rate $ 979,304 $ 2,403,007 Realized Gains and Losses. The FHLB had no sales of securities out of its available-for-sale portfolio for the six months ended June 30, 2019 or 2018 . Table 5.1 - Held-to-Maturity Securities by Major Security Types (in thousands) June 30, 2019 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value Non-MBS: U.S. Treasury obligations $ 34,760 $ 4 $ — $ 34,764 Total non-MBS 34,760 4 — 34,764 MBS: U.S. obligation single-family MBS 1,871,911 5,903 (608 ) 1,877,206 GSE single-family MBS 5,082,144 34,934 (38,252 ) 5,078,826 GSE multi-family MBS 8,358,353 652 (20,265 ) 8,338,740 Total MBS 15,312,408 41,489 (59,125 ) 15,294,772 Total $ 15,347,168 $ 41,493 $ (59,125 ) $ 15,329,536 December 31, 2018 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value Non-MBS: U.S. Treasury obligations $ 35,667 $ — $ (6 ) $ 35,661 Total non-MBS 35,667 — (6 ) 35,661 MBS: U.S. obligation single-family MBS 2,040,642 540 (47,463 ) 1,993,719 GSE single-family MBS 5,543,524 9,891 (162,097 ) 5,391,318 GSE multi-family MBS 8,171,389 1,739 (18,458 ) 8,154,670 Total MBS 15,755,555 12,170 (228,018 ) 15,539,707 Total $ 15,791,222 $ 12,170 $ (228,024 ) $ 15,575,368 (1) Carrying value equals amortized cost. Table 5.2 - Net Purchased Premiums Included in the Amortized Cost of MBS Classified as Held-to-Maturity (in thousands) June 30, 2019 December 31, 2018 Premiums $ 36,886 $ 42,299 Discounts (16,248 ) (19,730 ) Net purchased premiums $ 20,638 $ 22,569 Table 5.3 summarizes the held-to-maturity securities with unrealized losses, which are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position. Table 5.3 - Held-to-Maturity Securities in a Continuous Unrealized Loss Position (in thousands) June 30, 2019 Less than 12 Months 12 Months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses MBS: U.S. obligation single-family MBS $ 45,099 $ (6 ) $ 219,830 $ (602 ) $ 264,929 $ (608 ) GSE single-family MBS 23,675 (30 ) 3,041,562 (38,222 ) 3,065,237 (38,252 ) GSE multi-family MBS 4,431,699 (12,341 ) 2,581,943 (7,924 ) 7,013,642 (20,265 ) Total $ 4,500,473 $ (12,377 ) $ 5,843,335 $ (46,748 ) $ 10,343,808 $ (59,125 ) December 31, 2018 Less than 12 Months 12 Months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-MBS: U.S. Treasury obligations $ 35,661 $ (6 ) $ — $ — $ 35,661 $ (6 ) Total non-MBS 35,661 (6 ) — — 35,661 (6 ) MBS: U.S. obligation single-family MBS 175,663 (1,571 ) 1,526,835 (45,892 ) 1,702,498 (47,463 ) GSE single-family MBS 401,509 (1,581 ) 3,859,608 (160,516 ) 4,261,117 (162,097 ) GSE multi-family MBS 5,976,323 (18,185 ) 229,739 (273 ) 6,206,062 (18,458 ) Total MBS 6,553,495 (21,337 ) 5,616,182 (206,681 ) 12,169,677 (228,018 ) Total $ 6,589,156 $ (21,343 ) $ 5,616,182 $ (206,681 ) $ 12,205,338 $ (228,024 ) Table 5.4 - Held-to-Maturity Securities by Contractual Maturity (in thousands) June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost (1) Fair Value Amortized Cost (1) Fair Value Non-MBS: Due in 1 year or less $ 34,760 $ 34,764 $ 35,667 $ 35,661 Due after 1 year through 5 years — — — — Due after 5 years through 10 years — — — — Due after 10 years — — — — Total non-MBS 34,760 34,764 35,667 35,661 MBS (2) 15,312,408 15,294,772 15,755,555 15,539,707 Total $ 15,347,168 $ 15,329,536 $ 15,791,222 $ 15,575,368 (1) Carrying value equals amortized cost. (2) MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees. Table 5.5 - Interest Rate Payment Terms of Held-to-Maturity Securities (in thousands) June 30, 2019 December 31, 2018 Amortized cost of non-MBS: Fixed-rate $ 34,760 $ 35,667 Total amortized cost of non-MBS 34,760 35,667 Amortized cost of MBS: Fixed-rate 6,112,467 6,652,055 Variable-rate 9,199,941 9,103,500 Total amortized cost of MBS 15,312,408 15,755,555 Total $ 15,347,168 $ 15,791,222 Realized Gains and Losses. From time to time the FHLB may sell securities out of its held-to-maturity portfolio. These securities, generally, have less than 15 percent of the acquired principal outstanding at the time of the sale. These sales are considered maturities for the purposes of security classification. For the six months ended June 30, 2019 and 2018, the FHLB did not sell any held-to-maturity securities.

Other-Than-Temporary Impairment

Other-Than-Temporary Impairment Analysis	6 Months Ended
	Jun. 30, 2019
Other than Temporary Impairment Losses, Investments [Abstract]
Other than Temporary Impairment Analysis [Text Block]	Other-Than-Temporary Impairment Analysis The FHLB evaluates any of its individual available-for-sale and held-to-maturity investment securities holdings in an unrealized loss position for other-than-temporary impairment on a quarterly basis. U.S. Obligations and GSE Investments For its U.S. obligations and GSE investments (MBS and non-MBS), the FHLB has determined that the strength of the issuers' guarantees through direct obligations or support from the U.S. government is sufficient to protect the FHLB from losses based on current expectations. As a result, the FHLB determined that, as of June 30, 2019 , all of the gross unrealized losses on these investments were temporary as the declines in market value of these securities were not attributable to credit quality. Furthermore, the FHLB does not intend to sell the investments, and it is not more likely than not that the FHLB will be required to sell the investments before recovery of their amortized cost bases. As a result, the FHLB did not consider any of these investments to be other-than-temporarily impaired at June 30, 2019 . The FHLB did not consider any of its investments to be other-than-temporarily impaired at December 31, 2018 .

Advances

Advances	6 Months Ended
	Jun. 30, 2019
Advances [Abstract]
Advances [Text Block]	Advances The FHLB offers a wide range of fixed- and variable-rate Advance products with different maturities, interest rates, payment characteristics and optionality. The following table presents Advance redemptions by contractual maturity, including index-amortizing Advances, which are presented according to their predetermined amortization schedules. Table 7.1 - Advances by Redemption Term (dollars in thousands) June 30, 2019 December 31, 2018 Redemption Term Amount Weighted Average Interest Rate Amount Weighted Average Interest Rate Overdrawn demand deposit accounts $ 24 2.33 % $ — — % Due in 1 year or less 27,837,138 2.46 38,592,494 2.56 Due after 1 year through 2 years 4,371,314 2.27 6,461,276 2.39 Due after 2 years through 3 years 2,783,029 2.37 3,146,830 2.30 Due after 3 years through 4 years 1,215,689 2.56 1,145,118 2.56 Due after 4 years through 5 years 1,508,000 2.59 935,439 2.76 Thereafter 5,039,342 2.83 4,591,015 2.98 Total principal amount 42,754,536 2.49 54,872,172 2.56 Commitment fees (407 ) (456 ) Discount on Affordable Housing Program (AHP) Advances (3,764 ) (4,386 ) Premiums 1,366 1,510 Discounts (2,670 ) (3,090 ) Hedging adjustments 119,906 (43,506 ) Fair value option valuation adjustments and accrued interest 214 8 Total $ 42,869,181 $ 54,822,252 The FHLB offers certain fixed and variable-rate Advances to members that may be prepaid on specified dates (call dates) without incurring prepayment or termination fees (callable Advances). If the call option is exercised, replacement funding may be available to members. Other Advances may only be prepaid subject to a prepayment fee paid to the FHLB that makes the FHLB financially indifferent to the prepayment of the Advance. Table 7.2 - Advances by Redemption Term or Next Call Date (in thousands) Redemption Term or Next Call Date June 30, 2019 December 31, 2018 Overdrawn demand deposit accounts $ 24 $ — Due in 1 year or less 31,542,242 43,793,555 Due after 1 year through 2 years 5,175,065 4,338,117 Due after 2 years through 3 years 1,817,431 3,490,580 Due after 3 years through 4 years 899,435 753,716 Due after 4 years through 5 years 1,280,997 905,189 Thereafter 2,039,342 1,591,015 Total principal amount $ 42,754,536 $ 54,872,172 The FHLB also offers putable Advances. With a putable Advance, the FHLB effectively purchases put options from the member that allows the FHLB to terminate the Advance at predetermined dates. The FHLB normally would exercise its put option when interest rates increase relative to contractual rates. Table 7.3 - Advances by Redemption Term or Next Put Date for Putable Advances (in thousands) Redemption Term or Next Put Date June 30, 2019 December 31, 2018 Overdrawn demand deposit accounts $ 24 $ — Due in 1 year or less 28,434,638 38,827,494 Due after 1 year through 2 years 4,731,314 6,611,276 Due after 2 years through 3 years 2,990,529 3,221,830 Due after 3 years through 4 years 1,180,689 1,145,118 Due after 4 years through 5 years 1,218,000 835,439 Thereafter 4,199,342 4,231,015 Total principal amount $ 42,754,536 $ 54,872,172 Table 7.4 - Advances by Interest Rate Payment Terms (in thousands) June 30, 2019 December 31, 2018 Total fixed-rate (1) $ 25,161,613 $ 23,988,298 Total variable-rate (1) 17,592,923 30,883,874 Total principal amount $ 42,754,536 $ 54,872,172 (1) Payment terms based on current interest rate terms, which reflect any option exercises or rate conversions that have occurred subsequent to the related Advance issuance. Table 7.5 - Borrowers Holding Five Percent or more of Total Advances, Including Any Known Affiliates that are Members of the FHLB (dollars in millions) June 30, 2019 December 31, 2018 Principal % of Total Principal Amount of Advances Principal % of Total Principal Amount of Advances JPMorgan Chase Bank, N.A. $ 11,050 26 % JPMorgan Chase Bank, N.A. $ 23,400 43 % U.S. Bank, N.A. 4,574 11 U.S. Bank, N.A. 4,574 8 Third Federal Savings and Loan Association 3,826 9 Third Federal Savings and Loan Association 3,727 7 Nationwide Life Insurance Company 2,306 5 Total $ 31,701 58 % Total $ 21,756 51 %

Mortgage Loans Held for Portfol

Mortgage Loans Held for Portfolio	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Financing Receivables [Text Block]	Mortgage Loans Held for Portfolio Table 8.1 - Mortgage Loans Held for Portfolio (in thousands) June 30, 2019 December 31, 2018 Unpaid principal balance: Fixed rate medium-term single-family mortgage loans (1) $ 849,168 $ 933,340 Fixed rate long-term single-family mortgage loans 9,554,129 9,338,814 Total unpaid principal balance 10,403,297 10,272,154 Premiums 226,444 227,161 Discounts (2,410 ) (2,603 ) Hedging basis adjustments (2) 12,142 5,045 Total mortgage loans held for portfolio $ 10,639,473 $ 10,501,757 (1) Medium-term is defined as a term of 15 years or less. (2) Represents the unamortized balance of the mortgage purchase commitments' market values at the time of settlement. The market value of the commitment is included in the basis of the mortgage loan and amortized accordingly. Table 8.2 - Mortgage Loans Held for Portfolio by Collateral/Guarantee Type (in thousands) June 30, 2019 December 31, 2018 Unpaid principal balance: Conventional mortgage loans $ 10,150,600 $ 9,999,307 Federal Housing Administration (FHA) mortgage loans 252,697 272,847 Total unpaid principal balance $ 10,403,297 $ 10,272,154 Table 8.3 - Members, Including Any Known Affiliates that are Members of the FHLB, and Former Members Selling Five Percent or more of Total Unpaid Principal (dollars in millions) June 30, 2019 December 31, 2018 Principal % of Total Principal % of Total Union Savings Bank $ 3,462 33 % Union Savings Bank $ 3,449 34 % Guardian Savings Bank FSB 996 10 Guardian Savings Bank FSB 987 10

Allowance for Credit Losses

Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Allowance for Credit Losses [Text Block]	Allowance for Credit Losses The FHLB has established an allowance methodology for each of the FHLB's portfolio segments: credit products (Advances, Letters of Credit and other extensions of credit to members); FHA mortgage loans held for portfolio; and conventional mortgage loans held for portfolio. Credit Products The FHLB manages its credit exposure to credit products through an integrated approach that includes establishing a credit limit for each borrower and ongoing review of each borrower's financial condition, coupled with collateral and lending policies to limit risk of loss while balancing borrowers' needs for a reliable source of funding. In addition, the FHLB lends to eligible borrowers in accordance with federal law and Finance Agency regulations, which require the FHLB to obtain sufficient collateral to fully secure credit products. The estimated value of the collateral required to secure each member's credit products is calculated by applying collateral discounts, or haircuts, to the value of the collateral. The FHLB accepts certain investment securities, residential mortgage loans, deposits and other real estate related assets as collateral. In addition, community financial institutions are eligible to utilize expanded statutory collateral provisions for small business, agriculture loans and community development loans. The FHLB's capital stock owned by its member borrowers is also pledged as collateral. Collateral arrangements and a member’s borrowing capacity vary based on the financial condition and performance of the institution, the types of collateral pledged and the overall quality of those assets. The FHLB can also require additional or substitute collateral to protect its security interest. Management of the FHLB believes that these policies effectively manage the FHLB's credit risk from credit products. Members experiencing financial difficulties are subject to FHLB-performed “stress tests” of the impact of poorly performing assets on the member’s capital and loss reserve positions. Depending on the results of these tests and the level of over-collateralization, a member may be allowed to maintain pledged loan assets in its custody, may be required to deliver those loans into the custody of the FHLB or its agent, or may be required to provide details on those loans to facilitate an estimate of their fair value. The FHLB perfects its security interest in all pledged collateral. The FHLBank Act affords any security interest granted to the FHLB by a member priority over the claims or rights of any other party except for claims or rights of a third party that would otherwise be entitled to priority under applicable law and that are held by a bona fide purchaser for value or by a secured party holding a prior perfected security interest. Using a risk-based approach, the FHLB considers the payment status, collateralization levels, and borrower's financial condition to be indicators of credit quality for its credit products. At June 30, 2019 and December 31, 2018 , the FHLB had rights to collateral on a member-by-member basis with an estimated value in excess of its outstanding extensions of credit. The FHLB evaluates and makes changes to its collateral guidelines, as necessary, based on current market conditions. At June 30, 2019 and December 31, 2018 , the FHLB did not have any Advances that were past due, in non-accrual status or impaired. In addition, there were no troubled debt restructurings related to credit products of the FHLB during the six months ended June 30, 2019 or 2018 . The FHLB has not experienced any credit losses on Advances since it was founded in 1932. Based upon the collateral held as security, its credit extension and collateral policies and the repayment history on credit products, the FHLB did not record any credit losses on credit products as of June 30, 2019 or December 31, 2018 . Accordingly, the FHLB did not record any allowance for credit losses on Advances. At June 30, 2019 and December 31, 2018 , the FHLB did not record any liability to reflect an allowance for credit losses for off-balance sheet credit exposures. See Note 19 for additional information on the FHLB's off-balance sheet credit exposure. Mortgage Loans Held for Portfolio - FHA The FHLB invests in fixed-rate mortgage loans secured by one-to-four family residential properties insured by the FHA. The FHLB expects to recover any losses from such loans from the FHA. Any losses from these loans that are not recovered from the FHA would be due to a claim rejection by the FHA and, as such, would be recoverable from the selling participating financial institutions. Therefore, the FHLB only has credit risk for these loans if the seller or servicer fails to pay for losses not covered by the FHA insurance. As a result, the FHLB did not establish an allowance for credit losses on its FHA insured mortgage loans. Furthermore, due to the insurance, none of these mortgage loans have been placed on non-accrual status. Mortgage Loans Held for Portfolio - Conventional Mortgage Purchase Program (MPP) The FHLB determines the allowance for conventional loans through analyses that include consideration of various data observations such as past performance, current performance, loan portfolio characteristics, collateral-related characteristics, industry data, and prevailing economic conditions. The measurement of the allowance for credit losses consists of: (1) collectively evaluating homogeneous pools of residential mortgage loans; (2) reviewing specifically identified loans for impairment; and (3) considering other relevant qualitative factors. Collectively Evaluated Mortgage Loans. The credit risk analysis of conventional loans evaluated collectively for impairment considers historical delinquency migration, applies estimated loss severities, and incorporates the associated credit enhancements in order to determine the FHLB's best estimate of probable incurred losses at the reporting date. Migration analysis is a methodology for determining, through the FHLB's experience over a historical period, the rate of default on loans. The FHLB applies migration analysis to loans based on payment status categories such as current, 30, 60, and 90 days past due. The FHLB then estimates how many loans in these categories may migrate to a loss realization event and applies a current loss severity to estimate losses. The estimated losses are then reduced by the probable cash flows resulting from available credit enhancements. To properly determine the credit enhancements available to recover estimated losses, the FHLB performs the credit risk analysis of all conventional mortgage loans at the individual Master Commitment Contract level. The Master Commitment Contract is an agreement with a member in which the member agrees to make a best efforts attempt to sell a specific dollar amount of loans to the FHLB, generally over a one-year period. Any credit enhancement cash flows that are projected and assessed as not probable of receipt do not reduce estimated losses. Individually Evaluated Mortgage Loans. Conventional mortgage loans that are considered troubled debt restructurings are specifically identified for purposes of calculating the allowance for credit losses. The FHLB measures impairment of these specifically identified loans by either estimating the present value of expected cash flows, estimating the loan's observable market price, or estimating the fair value of the collateral if the loan is collateral dependent. The FHLB removes specifically identified loans evaluated for impairment from the collectively evaluated mortgage loan population. Qualitative Factors. The FHLB also assesses other qualitative factors in its estimation of loan losses for the collectively evaluated population. This amount represents a subjective management judgment, based on facts and circumstances that exist as of the reporting date, which is intended to cover other incurred losses that may not otherwise be captured in the methodology described above. Allowance for Credit Losses on Mortgage Loans. The following tables present a rollforward of the allowance for credit losses on conventional mortgage loans as well as the recorded investment in mortgage loans by impairment methodology. The recorded investment in a loan is the unpaid principal balance of the loan adjusted for accrued interest, unamortized premiums or discounts, hedging basis adjustments and direct write-downs. The recorded investment is not net of any allowance. Table 9.1 - Rollforward of Allowance for Credit Losses on Conventional Mortgage Loans (in thousands) Three Months Ended June 30, 2019 2018 Balance, beginning of period $ 779 $ 1,068 Net recoveries (charge offs) 5 (115 ) Balance, end of period $ 784 $ 953 Six Months Ended June 30, 2019 2018 Balance, beginning of period $ 840 $ 1,190 Net charge offs (56 ) (237 ) Balance, end of period $ 784 $ 953 Table 9.2 - Allowance for Credit Losses and Recorded Investment on Conventional Mortgage Loans by Impairment Methodology (in thousands) June 30, 2019 December 31, 2018 Allowance for credit losses: Collectively evaluated for impairment $ 784 $ 840 Individually evaluated for impairment — — Total allowance for credit losses $ 784 $ 840 Recorded investment: Collectively evaluated for impairment $ 10,407,411 $ 10,249,169 Individually evaluated for impairment 11,139 10,554 Total recorded investment $ 10,418,550 $ 10,259,723 Credit Enhancements. The conventional mortgage loans under the MPP are supported by some combination of credit enhancements (primary mortgage insurance (PMI), supplemental mortgage insurance (SMI) and the Lender Risk Account (LRA), including pooled LRA for those members participating in an aggregated MPP pool). The amount of credit enhancements needed to protect the FHLB against credit losses is determined through use of a third-party default model. These credit enhancements apply after a homeowner's equity is exhausted. Beginning in February 2011, the FHLB discontinued the use of SMI for all new loan purchases and replaced it with expanded use of the LRA. The LRA is funded by the FHLB as a portion of the purchase proceeds to cover expected losses. The LRA is recorded in other liabilities in the Statements of Condition. Excess funds over required balances are returned to the member in accordance with a step-down schedule that is established upon execution of a Master Commitment Contract, subject to performance of the related loan pool. The LRA established for a pool of loans is limited to only covering losses of that specific pool of loans. Table 9.3 - Changes in the LRA (in thousands) Six Months Ended June 30, 2019 LRA at beginning of year $ 213,260 Additions 8,853 Claims (10 ) Scheduled distributions (5,741 ) LRA at end of period $ 216,362 Credit Quality Indicators. Key credit quality indicators for mortgage loans include the migration of past due loans, loans in process of foreclosure, and non-accrual loans. The table below summarizes the FHLB's key credit quality indicators for mortgage loans. Table 9.4 - Recorded Investment in Delinquent Mortgage Loans (dollars in thousands) June 30, 2019 Conventional MPP Loans FHA Loans Total Past due 30-59 days delinquent $ 25,992 $ 13,767 $ 39,759 Past due 60-89 days delinquent 4,756 3,302 8,058 Past due 90 days or more delinquent 10,451 5,429 15,880 Total past due 41,199 22,498 63,697 Total current mortgage loans 10,377,351 233,628 10,610,979 Total mortgage loans $ 10,418,550 $ 256,126 $ 10,674,676 Other delinquency statistics: In process of foreclosure, included above (1) $ 7,388 $ 3,266 $ 10,654 Serious delinquency rate (2) 0.10 % 2.19 % 0.15 % Past due 90 days or more still accruing interest (3) $ 10,084 $ 5,429 $ 15,513 Loans on non-accrual status, included above $ 1,813 $ — $ 1,813 December 31, 2018 Conventional MPP Loans FHA Loans Total Past due 30-59 days delinquent $ 29,596 $ 14,845 $ 44,441 Past due 60-89 days delinquent 7,175 4,238 11,413 Past due 90 days or more delinquent 12,807 7,210 20,017 Total past due 49,578 26,293 75,871 Total current mortgage loans 10,210,145 250,308 10,460,453 Total mortgage loans $ 10,259,723 $ 276,601 $ 10,536,324 Other delinquency statistics: In process of foreclosure, included above (1) $ 7,557 $ 4,635 $ 12,192 Serious delinquency rate (2) 0.13 % 2.65 % 0.19 % Past due 90 days or more still accruing interest (3) $ 11,773 $ 7,210 $ 18,983 Loans on non-accrual status, included above $ 2,535 $ — $ 2,535 (1) Includes loans where the decision of foreclosure or a similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans dependent on their delinquency status. (2) Loans that are 90 days or more past due or in the process of foreclosure (including past due or current loans in the process of foreclosure) expressed as a percentage of the total loan portfolio class recorded investment amount. (3) Each conventional loan past due 90 days or more still accruing interest is on a schedule/scheduled monthly settlement basis and contains one or more credit enhancements. Loans that are well secured and in the process of collection as a result of remaining credit enhancements and schedule/scheduled settlement are not placed on non-accrual status. The FHLB did not have any real estate owned at June 30, 2019 or December 31, 2018 . Troubled Debt Restructurings . A troubled debt restructuring is considered to have occurred when a concession is granted to a borrower for economic or legal reasons related to the borrower's financial difficulties and that concession would not have been considered otherwise. The FHLB's troubled debt restructurings primarily involve loans where an agreement permits the recapitalization of past due amounts up to the original loan amount and certain loans discharged in Chapter 7 bankruptcy. A loan considered a troubled debt restructuring is individually evaluated for impairment when determining its related allowance for credit losses. Credit loss is measured by estimating expected cash shortfalls incurred as of the reporting date. The FHLB's recorded investment in modified loans considered troubled debt restructurings was (in thousands) $11,139 and $10,554 at June 30, 2019 and December 31, 2018 , respectively. The amount of troubled debt restructurings is not considered material to the FHLB's financial condition, results of operations, or cash flows.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities [Text Block]	Derivatives and Hedging Activities Nature of Business Activity The FHLB is exposed to interest rate risk primarily from the effect of interest rate changes on its interest-earning assets and on the interest-bearing liabilities that finance these assets. The goal of the FHLB's interest-rate risk management strategy is not to eliminate interest-rate risk, but to manage it within appropriate limits. To mitigate the risk of loss, the FHLB has established policies and procedures, which include guidelines on the amount of exposure to interest rate changes it is willing to accept. In addition, the FHLB monitors the risk to its interest income, net interest margin and average maturity of interest-earning assets and interest-bearing liabilities. The FHLB uses derivatives when they are considered to be the most cost-effective alternative to achieve the FHLB's financial and risk management objectives. See Note 11 - Derivatives and Hedging Activities in the FHLB's 2018 Annual Report on Form 10-K for additional information on the FHLB's derivative transactions. The FHLB transacts its derivatives with large banks and major broker-dealers. Some of these banks and broker-dealers or their affiliates buy, sell, and distribute Consolidated Obligations. Derivative transactions may be executed either with a counterparty (uncleared derivatives) or cleared through a Futures Commission Merchant (i.e., clearing agent) with a Derivative Clearing Organization (cleared derivatives). Once a derivative transaction has been accepted for clearing by a Derivative Clearing Organization (Clearinghouse), the executing counterparty is replaced with the Clearinghouse. The FHLB is not a derivative dealer and does not trade derivatives for short-term profit. Financial Statement Effect and Additional Financial Information The notional amount of derivatives serves as a factor in determining periodic interest payments or cash flows received and paid. The notional amount reflects the FHLB's involvement in the various classes of financial instruments and represents neither the actual amounts exchanged nor the overall exposure of the FHLB to credit and market risk; the overall risk is much smaller. The risks of derivatives only can be measured meaningfully on a portfolio basis that takes into account the counterparties, the types of derivatives, the items being hedged and any offsets between the derivatives and the items being hedged. Table 10.1 summarizes the notional amount and fair value of derivative instruments and total derivative assets and liabilities. Total derivative assets and liabilities include the effect of netting adjustments and cash collateral. For purposes of this disclosure, the derivative values include the fair value of derivatives and the related accrued interest. Table 10.1 - Fair Value of Derivative Instruments (in thousands) June 30, 2019 Notional Amount of Derivatives Derivative Assets Derivative Liabilities Derivatives designated as fair value hedging instruments: Interest rate swaps $ 8,935,948 $ 8,069 $ 50,402 Derivatives not designated as hedging instruments: Interest rate swaps 16,605,194 7,253 1,980 Interest rate swaptions 3,775,000 14,135 — Forward rate agreements 503,000 231 2,236 Mortgage delivery commitments 425,663 3,060 156 Total derivatives not designated as hedging instruments 21,308,857 24,679 4,372 Total derivatives before adjustments $ 30,244,805 32,748 54,774 Netting adjustments and cash collateral (1) 195,291 (51,680 ) Total derivative assets and total derivative liabilities $ 228,039 $ 3,094 December 31, 2018 Notional Amount of Derivatives Derivative Assets Derivative Liabilities Derivatives designated as fair value hedging instruments: Interest rate swaps $ 6,207,278 $ 2,393 $ 16,810 Derivatives not designated as hedging instruments: Interest rate swaps 4,322,480 3,311 1,904 Interest rate swaptions 3,000,000 15,911 — Forward rate agreements 131,000 — 2,664 Mortgage delivery commitments 146,009 1,726 1 Total derivatives not designated as hedging instruments 7,599,489 20,948 4,569 Total derivatives before adjustments $ 13,806,767 23,341 21,379 Netting adjustments and cash collateral (1) 42,424 (16,793 ) Total derivative assets and total derivative liabilities $ 65,765 $ 4,586 (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions, and also cash collateral and related accrued interest held or placed by the FHLB with the same clearing agent and/or counterparty. Cash collateral posted and related accrued interest was (in thousands) $250,609 and $71,246 at June 30, 2019 and December 31, 2018 . Cash collateral received and related accrued interest was (in thousands) $3,638 and $12,029 at June 30, 2019 and December 31, 2018 . In connection with the adoption of new accounting guidance, changes in fair value of the derivative hedging instrument and the hedged item attributable to the hedged risk for designated fair value hedges are recorded in net interest income in the same line as the earnings effect of the hedged item beginning on January 1, 2019. Prior to January 1, 2019, for designated fair value hedges, any hedge ineffectiveness (which represented the amount by which the change in the fair value of the derivative differed from the change in the fair value of the hedge item) was recorded in non-interest income as net gains (losses) on derivatives and hedging activities. See Note 2 for additional information on the adoption of Targeted Improvements to Accounting for Hedging Activities . Table 10.2 presents the impact of qualifying fair value hedging relationships on the Statements of Income as well as the total interest income (expense) by product. Table 10.2 - Impact of Fair Value Hedging Relationships on the Statements of Income (in thousands) Three Months Ended June 30, 2019 Advances Available-for-sale Securities Consolidated Bonds Total interest income (expense) recorded in the Statements of Income $ 320,763 $ 4,854 $ (300,060 ) Impact of Fair Value Hedging Relationships on the Statements of Income (1) Interest income/expense: Net interest settlements $ 11,852 $ (29 ) $ 357 Gain (loss) on derivatives (113,343 ) (4,275 ) 832 Gain (loss) on hedged items 111,791 4,085 (838 ) Effect on net interest income $ 10,300 $ (219 ) $ 351 Three Months Ended June 30, 2018 (2) Advances Consolidated Bonds Impact of Fair Value Hedging Relationships on the Statements of Income (1) Interest income/expense: Net interest settlements (3) $ 6,541 $ (1,607 ) Effect on net interest income $ 6,541 $ (1,607 ) Non-interest income (loss): Gain (loss) on derivatives $ 7,257 $ 1,276 Gain (loss) on hedged items (5,406 ) (1,557 ) Effect on non-interest income (loss) $ 1,851 $ (281 ) Six Months Ended June 30, 2019 Advances Available-for-sale Securities Consolidated Bonds Total interest income (expense) recorded in the Statements of Income $ 723,540 $ 18,413 $ (562,923 ) Impact of Fair Value Hedging Relationships on the Statements of Income (1) Interest income/expense: Net interest settlements $ 25,528 $ (44 ) $ 552 Gain (loss) on derivatives (165,937 ) (6,503 ) 1,874 Gain (loss) on hedged items 163,412 6,297 (1,999 ) Effect on net interest income $ 23,003 $ (250 ) $ 427 Six Months Ended June 30, 2018 (2) Advances Consolidated Bonds Impact of Fair Value Hedging Relationships on the Statements of Income (1) Interest income/expense: Net interest settlements (3) $ 7,434 $ (2,850 ) Effect on net interest income $ 7,434 $ (2,850 ) Non-interest income (loss): Gain (loss) on derivatives $ 50,310 $ 865 Gain (loss) on hedged items (47,569 ) (1,044 ) Effect on non-interest income (loss) $ 2,741 $ (179 ) (1) Includes interest rate swaps. (2) Prior period amounts were not conformed to new hedge accounting guidance adopted January 1, 2019. (3) Excludes (amortization)/accretion on closed fair value hedge relationships of (in thousands) $(152) for the three months ended June 30, 2018 and (in thousands) $(323) for the six months ended June 30, 2018 . Table 10.3 presents the cumulative basis adjustments on hedged items designated as fair value hedges and the related amortized cost of the hedged items. Table 10.3 - Cumulative Basis Adjustments for Fair Value Hedges (in thousands) June 30, 2019 Hedged Item Amortized Cost of Hedged Asset/ Liability (1) Basis Adjustment for Active Hedging Relationships Included in Amortized Cost Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost Cumulative Amount of Fair Value Hedging Basis Adjustments Advances $ 8,616,748 $ 118,868 $ 1,038 $ 119,906 Available-for-sale securities 129,304 7,304 — 7,304 Consolidated Bonds 395,788 1,803 — 1,803 (1) Includes only the portion of amortized cost representing the hedged items in fair value hedging relationships. Table 10.4 presents net gains (losses) related to derivatives and hedging activities recorded in non-interest income (loss). For fair value hedging relationships, the portion of net gains (losses) representing hedge ineffectiveness were recorded in non-interest income for periods prior to January 1, 2019. Table 10.4 - Net Gains (Losses) on Derivatives and Hedging Activities Recorded in Non-interest Income (Loss) (in thousands) Three Months Ended June 30, 2019 2018 Derivatives designated as fair value hedging relationships: Interest rate swaps N/A $ 1,570 Derivatives not designated as hedging instruments: Economic hedges: Interest rate swaps $ (147,873 ) 5,504 Interest rate swaptions (3,024 ) (3,909 ) Forward rate agreements (4,532 ) 455 Net interest settlements (3,219 ) (14,857 ) Mortgage delivery commitments 5,863 (336 ) Total net gains (losses) related to derivatives not designated as hedging instruments (152,785 ) (13,143 ) Price alignment amount (1) 659 (19 ) Net gains (losses) on derivatives and hedging activities $ (152,126 ) $ (11,592 ) Six Months Ended June 30, 2019 2018 Derivatives designated as fair value hedging relationships: Interest rate swaps N/A $ 2,562 Derivatives not designated as hedging instruments: Economic hedges: Interest rate swaps $ (154,403 ) (18,973 ) Interest rate swaptions (15,500 ) 749 Forward rate agreements (6,699 ) 4,484 Net interest settlements (11,386 ) (22,181 ) Mortgage delivery commitments 9,219 (4,585 ) Total net gains (losses) related to derivatives not designated as hedging instruments (178,769 ) (40,506 ) Price alignment amount (1) 684 (21 ) Net gains (losses) on derivatives and hedging activities $ (178,085 ) $ (37,965 ) (1) This amount is for derivatives for which variation margin is characterized as a daily settled contract. Credit Risk on Derivatives The FHLB is subject to credit risk due to the risk of non-performance by counterparties to its derivative transactions, and manages credit risk through credit analysis, collateral requirements and adherence to the requirements set forth in its policies, U.S. Commodity Futures Trading Commission regulations, and Finance Agency regulations. For uncleared derivatives, the degree of credit risk depends on the extent to which master netting arrangements are included in these contracts to mitigate the risk. The FHLB requires collateral agreements on its uncleared derivatives with the collateral delivery threshold set to zero. For cleared derivatives, the Clearinghouse is the FHLB's counterparty. The Clearinghouse notifies the clearing agent of the required initial and variation margin and the clearing agent in turn notifies the FHLB. The FHLB utilizes two Clearinghouses for all cleared derivative transactions, LCH Ltd. and CME Clearing. At both Clearinghouses, variation margin is characterized as daily settlement payments, while initial margin is considered to be collateral. The requirement that the FHLB post initial and variation margin through the clearing agent, to the Clearinghouse, exposes the FHLB to credit risk if the clearing agent or the Clearinghouse fails to meet its obligations. The use of cleared derivatives is intended to mitigate credit risk exposure because a central counterparty is substituted for individual counterparties and collateral/payments for changes in the value of cleared derivatives is posted daily through a clearing agent. For cleared derivatives, the Clearinghouse determines initial margin requirements and generally credit ratings are not factored into the initial margin. However, clearing agents may require additional initial margin to be posted based on credit considerations, including, but not limited to, credit rating downgrades. At June 30, 2019 , the FHLB was not required to post additional initial margin by its clearing agents based on credit considerations. Offsetting of Derivative Assets and Derivative Liabilities The FHLB presents derivative instruments, related cash collateral received or pledged, and associated accrued interest, on a net basis by clearing agent and/or by counterparty when it has met the netting requirements. The FHLB has analyzed the enforceability of offsetting rights incorporated in its cleared derivative transactions, and it expects that the exercise of those offsetting rights by a non-defaulting party under these transactions would be upheld under applicable law upon an event of default including bankruptcy, insolvency, or similar proceeding involving the Clearinghouse or the FHLB's clearing agent, or both. Based on this analysis, the FHLB presents a net derivative receivable or payable for all of its transactions through a particular clearing agent with a particular Clearinghouse. Table 10.5 presents separately the fair value of derivative instruments meeting or not meeting netting requirements, including the related collateral received from or pledged to counterparties. At June 30, 2019 and December 31, 2018 , the FHLB did not receive or pledge any non-cash collateral. Any over-collateralization under an individual clearing agent and/or counterparty level is not included in the determination of the net unsecured amount. Table 10.5 - Offsetting of Derivative Assets and Derivative Liabilities (in thousands) June 30, 2019 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Derivative Instruments Not Meeting Netting Requirements (1) Total Derivative Assets and Total Derivative Liabilities Derivative Assets: Uncleared $ 18,155 $ (17,456 ) $ 3,291 $ 3,990 Cleared 11,302 212,747 — 224,049 Total $ 228,039 Derivative Liabilities: Uncleared $ 50,548 $ (49,846 ) $ 2,392 $ 3,094 Cleared 1,834 (1,834 ) — — Total $ 3,094 December 31, 2018 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Derivative Instruments Not Meeting Netting Requirements (1) Total Derivative Assets and Total Derivative Liabilities Derivative Assets: Uncleared $ 20,284 $ (20,250 ) $ 1,726 $ 1,760 Cleared 1,331 62,674 — 64,005 Total $ 65,765 Derivative Liabilities: Uncleared $ 13,745 $ (11,824 ) $ 2,665 $ 4,586 Cleared 4,969 (4,969 ) — — Total $ 4,586 (1) Represents mortgage delivery commitments and forward rate agreements that are not subject to an enforceable netting agreement.

Deposits

Deposits	6 Months Ended
	Jun. 30, 2019
Deposits [Abstract]
Deposit [Text Block]	Deposits Table 11.1 - Deposits (in thousands) June 30, 2019 December 31, 2018 Interest bearing: Demand and overnight $ 658,340 $ 605,979 Term 43,850 51,600 Other 6,310 4,959 Total interest bearing 708,500 662,538 Non-interest bearing: Other 8,825 6,478 Total non-interest bearing 8,825 6,478 Total deposits $ 717,325 $ 669,016

Consolidated Obligations

Consolidated Obligations	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Consolidated Obligations [Text Block]	Consolidated Obligations Table 12.1 - Consolidated Discount Notes Outstanding (dollars in thousands) Book Value Principal Amount Weighted Average Interest Rate (1) June 30, 2019 $ 41,492,853 $ 41,556,477 2.29 % December 31, 2018 $ 46,943,632 $ 47,071,113 2.35 % (1) Represents an implied rate without consideration of concessions. Table 12.2 - Consolidated Bonds Outstanding by Original Contractual Maturity (dollars in thousands) June 30, 2019 December 31, 2018 Year of Original Contractual Maturity Amount Weighted Average Interest Rate Amount Weighted Average Interest Rate Due in 1 year or less $ 25,729,565 2.36 % $ 21,085,800 2.20 % Due after 1 year through 2 years 7,945,000 2.06 6,998,565 2.13 Due after 2 years through 3 years 5,142,345 2.33 6,829,595 2.05 Due after 3 years through 4 years 2,572,080 2.48 2,958,620 2.39 Due after 4 years through 5 years 2,694,580 2.73 3,248,975 2.63 Thereafter 4,630,000 2.96 4,525,635 2.94 Total principal amount 48,713,570 2.39 45,647,190 2.29 Premiums 67,772 75,809 Discounts (26,856 ) (29,275 ) Hedging adjustments 1,803 (196 ) Fair value option valuation adjustment and accrued interest 24,128 (34,390 ) Total $ 48,780,417 $ 45,659,138 Table 12.3 - Consolidated Bonds Outstanding by Call Features (in thousands) June 30, 2019 December 31, 2018 Principal Amount of Consolidated Bonds: Non-callable $ 41,936,570 $ 38,539,190 Callable 6,777,000 7,108,000 Total principal amount $ 48,713,570 $ 45,647,190 Table 12.4 - Consolidated Bonds Outstanding by Original Contractual Maturity or Next Call Date (in thousands) Year of Original Contractual Maturity or Next Call Date June 30, 2019 December 31, 2018 Due in 1 year or less $ 31,354,565 $ 27,173,800 Due after 1 year through 2 years 6,865,000 5,773,565 Due after 2 years through 3 years 3,661,345 5,060,595 Due after 3 years through 4 years 2,096,080 2,470,620 Due after 4 years through 5 years 1,857,580 2,231,975 Thereafter 2,879,000 2,936,635 Total principal amount $ 48,713,570 $ 45,647,190 Table 12.5 - Consolidated Bonds by Interest-rate Payment Type (in thousands) June 30, 2019 December 31, 2018 Principal Amount of Consolidated Bonds: Fixed-rate $ 32,601,570 $ 29,837,190 Variable-rate 16,102,000 15,470,000 Step-up 10,000 340,000 Total principal amount $ 48,713,570 $ 45,647,190

Affordable Housing Program (AHP

Affordable Housing Program (AHP)	6 Months Ended
	Jun. 30, 2019
Affordable Housing Program (AHP) [Abstract]
Affordable Housing Program (AHP) [Text Block]	Affordable Housing Program (AHP) The FHLBank Act requires each FHLBank to establish an AHP. Each FHLBank provides subsidies in the form of direct grants and below-market interest rate AHP Advances to members who use the funds to assist in the purchase, construction, or rehabilitation of housing for very low-, low-, and moderate-income households. Each FHLBank is required to contribute to its AHP the greater of 10 percent of its previous year's income subject to assessment, or the prorated sum required to ensure the aggregate contribution by the FHLBanks is no less than $ 100 million for each year. For purposes of the AHP calculation, income subject to assessment is defined as net income before assessments, plus interest expense related to mandatorily redeemable capital stock. The FHLB accrues AHP expense monthly based on its income subject to assessment. The FHLB reduces the AHP liability as members use subsidies. Table 13.1 - Analysis of AHP Liability (in thousands) Balance at December 31, 2018 $ 117,336 Assessments (current year additions) 15,347 Subsidy uses, net (14,277 ) Balance at June 30, 2019 $ 118,406

Capital

Capital	6 Months Ended
	Jun. 30, 2019
Capital [Abstract]
Capital [Text Block]	Capital Table 14.1 - Capital Requirements (dollars in thousands) June 30, 2019 December 31, 2018 Minimum Requirement Actual Minimum Requirement Actual Risk-based capital $ 746,300 $ 4,866,050 $ 837,666 $ 5,366,443 Capital-to-assets ratio (regulatory) 4.00 % 5.05 % 4.00 % 5.41 % Regulatory capital $ 3,856,979 $ 4,866,050 $ 3,968,103 $ 5,366,443 Leverage capital-to-assets ratio (regulatory) 5.00 % 7.57 % 5.00 % 8.11 % Leverage capital $ 4,821,224 $ 7,299,075 $ 4,960,129 $ 8,049,665 Restricted Retained Earnings. At June 30, 2019 and December 31, 2018 the FHLB had (in thousands) $418,325 and $ 390,829 in restricted retained earnings. These restricted retained earnings are not available to pay dividends but are available to absorb unexpected losses, if any, that the FHLB may experience. Table 14.2 - Mandatorily Redeemable Capital Stock Rollforward (in thousands) Balance, December 31, 2018 $ 23,184 Capital stock subject to mandatory redemption reclassified from equity 1,178 Repurchase/redemption of mandatorily redeemable capital stock (1,801 ) Balance, June 30, 2019 $ 22,561 Table 14.3 - Mandatorily Redeemable Capital Stock by Contractual Year of Redemption (in thousands) Contractual Year of Redemption June 30, 2019 December 31, 2018 Year 1 $ 351 $ 1,633 Year 2 20 371 Year 3 1,438 357 Year 4 1,571 1,209 Year 5 2,769 3,553 Thereafter (1) 650 624 Past contractual redemption date due to remaining activity (2) 15,762 15,437 Total $ 22,561 $ 23,184 (1) Represents mandatorily redeemable capital stock resulting from a Finance Agency rule effective February 19, 2016, that made captive insurance companies ineligible for FHLB membership. Captive insurance companies that were admitted as FHLB members prior to September 12, 2014, will have their membership terminated no later than February 19, 2021. Captive insurance companies that were admitted as FHLB members on or after September 12, 2014, had their membership terminated no later than February 19, 2017. The related mandatorily redeemable capital stock is not required to be redeemed until five years after the member's termination. (2) Represents mandatorily redeemable capital stock that is past the end of the contractual redemption period because there is activity outstanding to which the mandatorily redeemable capital stock relates.

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	6 Months Ended
	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive (Loss) Income [Text Block]	Accumulated Other Comprehensive Income (Loss) The following tables summarize the changes in accumulated other comprehensive income (loss) for the three and six months ended June 30, 2019 and 2018 . Table 15.1 - Accumulated Other Comprehensive Income (Loss) (in thousands) Net unrealized gains (losses) on available-for-sale securities Pension and postretirement benefits Total accumulated other comprehensive income (loss) BALANCE, MARCH 31, 2018 $ 19 $ (16,050 ) $ (16,031 ) Other comprehensive income before reclassification: Net unrealized gains (losses) 201 — 201 Reclassifications from other comprehensive income (loss) to net income: Amortization - pension and postretirement benefits — 487 487 Net current period other comprehensive income (loss) 201 487 688 BALANCE, JUNE 30, 2018 $ 220 $ (15,563 ) $ (15,343 ) BALANCE, MARCH 31, 2019 $ 77 $ (12,532 ) $ (12,455 ) Other comprehensive income before reclassification: Net unrealized gains (losses) (437 ) — (437 ) Reclassifications from other comprehensive income (loss) to net income: Amortization - pension and postretirement benefits — 516 516 Net current period other comprehensive income (loss) (437 ) 516 79 BALANCE, JUNE 30, 2019 $ (360 ) $ (12,016 ) $ (12,376 ) Net unrealized gains (losses) on available-for-sale securities Pension and postretirement benefits Total accumulated other comprehensive income (loss) BALANCE, DECEMBER 31, 2017 $ (124 ) $ (16,536 ) $ (16,660 ) Other comprehensive income before reclassification: Net unrealized gains (losses) 344 — 344 Reclassifications from other comprehensive income (loss) to net income: Amortization - pension and postretirement benefits — 973 973 Net current period other comprehensive income (loss) 344 973 1,317 BALANCE, JUNE 30, 2018 $ 220 $ (15,563 ) $ (15,343 ) BALANCE, DECEMBER 31, 2018 $ (110 ) $ (12,933 ) $ (13,043 ) Other comprehensive income before reclassification: Net unrealized gains (losses) (250 ) — (250 ) Reclassifications from other comprehensive income (loss) to net income: Amortization - pension and postretirement benefits — 917 917 Net current period other comprehensive income (loss) (250 ) 917 667 BALANCE, JUNE 30, 2019 $ (360 ) $ (12,016 ) $ (12,376 )

Pension and Postretirement Bene

Pension and Postretirement Benefit Plans	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	Pension and Postretirement Benefit Plans Qualified Defined Benefit Multi-employer Plan. The FHLB participates in the Pentegra Defined Benefit Plan for Financial Institutions (Pentegra Defined Benefit Plan), a tax-qualified defined benefit pension plan. Under the Pentegra Defined Benefit Plan, contributions made by one participating employer may be used to provide benefits to employees of other participating employers because assets contributed by an employer are not segregated in a separate account or restricted to provide benefits only to employees of that employer. Also, in the event a participating employer is unable to meet its contribution requirements, the required contributions for the other participating employers could increase proportionately. The Pentegra Defined Benefit Plan covers all officers and employees of the FHLB who meet certain eligibility requirements. Contributions to the Pentegra Defined Benefit Plan charged to compensation and benefit expense were $1,969,000 and $2,525,000 in the three months ended June 30, 2019 and 2018 , respectively, and $3,937,000 and $5,051,000 in the six months ended June 30, 2019 and 2018 , respectively. Qualified Defined Contribution Plan. The FHLB also participates in the Pentegra Defined Contribution Plan for Financial Institutions, a tax-qualified, defined contribution plan. The FHLB contributes a percentage of the participants' compensation by making a matching contribution equal to a percentage of voluntary employee contributions, subject to certain IRS limitations. The FHLB contributed $309,000 and $290,000 in the three months ended June 30, 2019 and 2018 , respectively, and $806,000 and $767,000 in the six months ended June 30, 2019 and 2018 , respectively. Nonqualified Supplemental Defined Benefit Retirement Plan (Defined Benefit Retirement Plan) . The FHLB maintains a nonqualified, unfunded defined benefit plan. The plan ensures that participants receive the full amount of benefits to which they would have been entitled under the qualified defined benefit plan in the absence of limits on benefit levels imposed by the IRS. There are no funded plan assets. The FHLB has established a grantor trust, which is included in held-to-maturity securities on the Statements of Condition, to meet future benefit obligations and current payments to beneficiaries. Postretirement Benefits Plan . The FHLB also sponsors a Postretirement Benefits Plan that includes health care and life insurance benefits for eligible retirees. Future retirees are eligible for the postretirement benefits plan if they were hired prior to August 1, 1990, are age 55 or older, and their age plus years of continuous service at retirement are greater than or equal to 80. Spouses are covered subject to required contributions. There are no funded plan assets that have been designated to provide postretirement benefits. Table 16.1 - Net Periodic Benefit Cost (in thousands) Three Months Ended June 30, Defined Benefit Retirement Plan Postretirement Benefits Plan 2019 2018 2019 2018 Net Periodic Benefit Cost Service cost $ 234 $ 277 $ 3 $ 4 Interest cost 392 331 45 42 Amortization of net loss 516 487 — — Net periodic benefit cost $ 1,142 $ 1,095 $ 48 $ 46 Six Months Ended June 30, Defined Benefit Postretirement Benefits Plan 2019 2018 2019 2018 Net Periodic Benefit Cost Service cost $ 451 $ 553 $ 7 $ 9 Interest cost 775 663 90 83 Amortization of net loss 917 973 — — Net periodic benefit cost $ 2,143 $ 2,189 $ 97 $ 92 For the Defined Benefit Retirement Plan and the Postretirement Benefits Plan, the related service cost is recorded as part of Non-Interest Expense - Compensation and Benefits on the Statements of Income. The non-service related components of interest cost and amortization of net loss are recorded as Non-Interest Expense - Other in the Statements of Income.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Information [Text Block]	Segment Information The FHLB has identified two primary operating segments based on its method of internal reporting: Traditional Member Finance and the MPP. These segments reflect the FHLB's two primary Mission Asset Activities and the manner in which they are managed from the perspective of development, resource allocation, product delivery, pricing, credit risk and operational administration. The segments identify the principal ways the FHLB provides services to member stockholders. Table 17.1 - Financial Performance by Operating Segment (in thousands) Three Months Ended June 30, Traditional Member Finance MPP Total 2019 Net interest income $ 70,713 $ 26,715 $ 97,428 Non-interest income (loss) (2,109 ) (550 ) (2,659 ) Non-interest expense 20,602 2,776 23,378 Income before assessments 48,002 23,389 71,391 Affordable Housing Program assessments 4,829 2,339 7,168 Net income $ 43,173 $ 21,050 $ 64,223 2018 Net interest income $ 103,643 $ 25,548 $ 129,191 Non-interest income (loss) (10,737 ) (2,072 ) (12,809 ) Non-interest expense 19,381 2,760 22,141 Income before assessments 73,525 20,716 94,241 Affordable Housing Program assessments 7,388 2,072 9,460 Net income $ 66,137 $ 18,644 $ 84,781 Six Months Ended June 30, Traditional Member Finance MPP Total 2019 Net interest income $ 161,108 $ 58,578 $ 219,686 Non-interest income (loss) (14,064 ) (6,994 ) (21,058 ) Non-interest expense 39,992 5,809 45,801 Income before assessments 107,052 45,775 152,827 Affordable Housing Program assessments 10,769 4,578 15,347 Net income $ 96,283 $ 41,197 $ 137,480 2018 Net interest income $ 196,727 $ 50,524 $ 247,251 Non-interest income (loss) (16,927 ) 261 (16,666 ) Non-interest expense 38,245 6,020 44,265 Income before assessments 141,555 44,765 186,320 Affordable Housing Program assessments 14,235 4,477 18,712 Net income $ 127,320 $ 40,288 $ 167,608 Table 17.2 - Asset Balances by Operating Segment (in thousands) Assets Traditional Member MPP Total June 30, 2019 $ 83,339,006 $ 13,085,464 $ 96,424,470 December 31, 2018 86,042,150 13,160,423 99,202,573

Fair Value Disclosures

Fair Value Disclosures	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Fair Value Disclosures The fair value amounts recorded on the Statements of Condition and presented in the related note disclosures have been determined by the FHLB using available market information and the FHLB's best judgment of appropriate valuation methods. GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (i.e., an exit price). The fair values reflect the FHLB's judgment of how a market participant would estimate the fair values. Fair Value Hierarchy . GAAP establishes a fair value hierarchy and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The inputs are evaluated and an overall level for the measurement is determined. This overall level is an indication of how market observable the fair value measurement is. An entity must disclose the level within the fair value hierarchy in which the measurements are classified. The fair value hierarchy prioritizes the inputs used to measure fair value into three broad levels: Level 1 Inputs - Quoted prices (unadjusted) for identical assets or liabilities in an active market that the reporting entity can access on the measurement date. Level 2 Inputs - Inputs other than quoted prices within Level 1 that are observable inputs for the asset or liability, either directly or indirectly. If the asset or liability has a specified (contractual) term, a Level 2 input must be observable for substantially the full term of the asset or liability. Level 2 inputs include the following: (1) quoted prices for similar assets or liabilities in active markets; (2) quoted prices for identical or similar assets or liabilities in markets that are not active; (3) inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates and yield curves that are observable at commonly quoted intervals, and implied volatilities); and (4) inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 Inputs - Unobservable inputs for the asset or liability. The FHLB reviews the fair value hierarchy classifications on a quarterly basis. Changes in the observability of the valuation inputs may result in a reclassification of certain financial assets or liabilities. Such reclassifications would be reported as transfers in/out at fair value as of the beginning of the quarter in which the changes occur. The FHLB did not have any transfers of assets or liabilities between fair value levels during the six months ended June 30, 2019 or 2018 . Table 18.1 presents the carrying value, fair value, and fair value hierarchy of financial assets and liabilities of the FHLB. The FHLB records trading securities, available-for-sale securities, derivative assets, derivative liabilities, certain Advances and certain Consolidated Obligation Bonds at fair value on a recurring basis, and on occasion, certain mortgage loans held for portfolio on a nonrecurring basis. The FHLB records all other financial assets and liabilities at amortized cost. Refer to Table 18.2 for further details about the financial assets and liabilities held at fair value on either a recurring or nonrecurring basis. Table 18.1 - Fair Value Summary (in thousands) June 30, 2019 Fair Value Financial Instruments Carrying Value Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets: Cash and due from banks $ 21,771 $ 21,771 $ 21,771 $ — $ — $ — Interest-bearing deposits 375,120 375,120 — 375,120 — — Securities purchased under agreements to resell 3,301,185 3,301,241 — 3,301,241 — — Federal funds sold 13,680,000 13,680,000 — 13,680,000 — — Trading securities 8,761,698 8,761,698 — 8,761,698 — — Available-for-sale securities 978,944 978,944 — 978,944 — — Held-to-maturity securities 15,347,168 15,329,536 — 15,329,536 — — Advances (2) 42,869,181 42,929,502 — 42,929,502 — — Mortgage loans held for portfolio, net 10,638,689 10,773,032 — 10,762,691 10,341 — Accrued interest receivable 201,154 201,154 — 201,154 — — Derivative assets 228,039 228,039 — 32,748 — 195,291 Liabilities: Deposits 717,325 717,425 — 717,425 — — Consolidated Obligations: Discount Notes 41,492,853 41,498,903 — 41,498,903 — — Bonds (3) 48,780,417 49,077,406 — 49,077,406 — — Mandatorily redeemable capital stock 22,561 22,561 22,561 — — — Accrued interest payable 159,960 159,960 — 159,960 — — Derivative liabilities 3,094 3,094 — 54,774 — (51,680 ) Other: Standby bond purchase agreements — 601 — 601 — — (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty. (2) Includes (in thousands) $10,214 of Advances recorded under the fair value option at June 30, 2019 . (3) Includes (in thousands) $8,071,128 of Consolidated Obligation Bonds recorded under the fair value option at June 30, 2019 . December 31, 2018 Fair Value Financial Instruments Carrying Value Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets: Cash and due from banks $ 10,037 $ 10,037 $ 10,037 $ — $ — $ — Interest-bearing deposits 122 122 — 122 — — Securities purchased under agreements to resell 4,402,208 4,402,237 — 4,402,237 — — Federal funds sold 10,793,000 10,793,000 — 10,793,000 — — Trading securities 223,980 223,980 — 223,980 — — Available-for-sale securities 2,402,897 2,402,897 — 2,402,897 — — Held-to-maturity securities 15,791,222 15,575,368 — 15,575,368 — — Advances (2) 54,822,252 54,736,645 — 54,736,645 — — Mortgage loans held for portfolio, net 10,500,917 10,329,982 — 10,317,010 12,972 — Accrued interest receivable 169,982 169,982 — 169,982 — — Derivative assets 65,765 65,765 — 23,341 — 42,424 Liabilities: Deposits 669,016 668,947 — 668,947 — — Consolidated Obligations: Discount Notes 46,943,632 46,944,523 — 46,944,523 — — Bonds (3) 45,659,138 45,385,615 — 45,385,615 — — Mandatorily redeemable capital stock 23,184 23,184 23,184 — — — Accrued interest payable 147,337 147,337 — 147,337 — — Derivative liabilities 4,586 4,586 — 21,379 — (16,793 ) Other: Standby bond purchase agreements — 443 — 443 — — (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty. (2) Includes (in thousands) $10,008 of Advances recorded under the fair value option at December 31, 2018 . (3) Includes (in thousands) $3,906,610 of Consolidated Obligation Bonds recorded under the fair value option at December 31, 2018 . Summary of Valuation Methodologies and Primary Inputs . The valuation methodologies and primary inputs used to develop the measurement of fair value for assets and liabilities that are measured at fair value on a recurring or nonrecurring basis in the Statement of Condition are disclosed in Note 19 - Fair Value Disclosures in the FHLB's 2018 Annual Report on Form 10-K. There have been no changes in the valuation methodologies during 2019 . Fair Value Measurements . Table 18.2 presents the fair value of financial assets and liabilities that are recorded on a recurring or nonrecurring basis at June 30, 2019 and December 31, 2018 , by level within the fair value hierarchy. The FHLB records nonrecurring fair value adjustments to reflect partial write-downs on certain mortgage loans. Table 18.2 - Fair Value Measurements (in thousands) Fair Value Measurements at June 30, 2019 Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Recurring fair value measurements - Assets Trading securities: U.S. Treasury obligations $ 7,055,007 $ — $ 7,055,007 $ — $ — GSE obligations 1,706,153 — 1,706,153 — — U.S. obligation single-family MBS 538 — 538 — — Total trading securities 8,761,698 — 8,761,698 — — Available-for-sale securities: Certificates of deposit 850,035 — 850,035 — — GSE obligations 128,909 — 128,909 — — Total available-for-sale securities 978,944 — 978,944 — — Advances 10,214 — 10,214 — — Derivative assets: Interest rate related 224,748 — 29,457 — 195,291 Forward rate agreements 231 — 231 — — Mortgage delivery commitments 3,060 — 3,060 — — Total derivative assets 228,039 — 32,748 — 195,291 Total assets at fair value $ 9,978,895 $ — $ 9,783,604 $ — $ 195,291 Recurring fair value measurements - Liabilities Consolidated Obligation Bonds $ 8,071,128 $ — $ 8,071,128 $ — $ — Derivative liabilities: Interest rate related 702 — 52,382 — (51,680 ) Forward rate agreements 2,236 — 2,236 — — Mortgage delivery commitments 156 — 156 — — Total derivative liabilities 3,094 — 54,774 — (51,680 ) Total liabilities at fair value $ 8,074,222 $ — $ 8,125,902 $ — $ (51,680 ) (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty. Fair Value Measurements at December 31, 2018 Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Recurring fair value measurements - Assets Trading securities: GSE obligations $ 223,368 $ — $ 223,368 $ — $ — U.S. obligation single-family MBS 612 — 612 — — Total trading securities 223,980 — 223,980 — — Available-for-sale securities: Certificates of deposit 2,350,002 — 2,350,002 — — GSE obligations 52,895 — 52,895 — — Total available-for-sale securities 2,402,897 — 2,402,897 — — Advances 10,008 — 10,008 — — Derivative assets: Interest rate related 64,039 — 21,615 — 42,424 Mortgage delivery commitments 1,726 — 1,726 — — Total derivative assets 65,765 — 23,341 — 42,424 Total assets at fair value $ 2,702,650 $ — $ 2,660,226 $ — $ 42,424 Recurring fair value measurements - Liabilities Consolidated Obligation Bonds $ 3,906,610 $ — $ 3,906,610 $ — $ — Derivative liabilities: Interest rate related 1,921 — 18,714 — (16,793 ) Forward rate agreements 2,664 — 2,664 — — Mortgage delivery commitments 1 — 1 — — Total derivative liabilities 4,586 — 21,379 — (16,793 ) Total liabilities at fair value $ 3,911,196 $ — $ 3,927,989 $ — $ (16,793 ) Nonrecurring fair value measurements - Assets (2) Mortgage loans held for portfolio $ 311 $ — $ — $ 311 (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty. (2) The fair value information presented is as of the date the fair value adjustment was recorded during the year ended December 31, 2018 . Fair Value Option . The fair value option provides an irrevocable option to elect fair value as an alternative measurement for selected financial assets, financial liabilities, unrecognized firm commitments, and written loan commitments not previously carried at fair value. It requires a company to display the fair value of those assets and liabilities for which it has chosen to use fair value on the face of the Statements of Condition. Fair value is used for both the initial and subsequent measurement of the designated assets, liabilities and commitments, with the changes in fair value recognized in net income. If elected, interest income and interest expense on Advances and Consolidated Bonds carried at fair value are recognized based solely on the contractual amount of interest due or unpaid. Any transaction fees or costs are immediately recognized into other non-interest income or other non-interest expense. The FHLB has elected the fair value option for certain financial instruments that either do not qualify for hedge accounting or may be at risk for not meeting hedge effectiveness requirements. These fair value elections were made primarily in an effort to mitigate the potential income statement volatility that can arise from economic hedging relationships in which the carrying value of the hedged item is not adjusted for changes in fair value. Table 18.3 presents net gains (losses) recognized in earnings related to financial assets and liabilities in which the fair value option was elected during the six months ended June 30, 2019 and 2018 . Table 18.3 – Fair Value Option - Financial Assets and Liabilities (in thousands) Three Months Ended June 30, Six Months Ended June 30, Net Gains (Losses) from Changes in Fair Value Recognized in Earnings 2019 2018 2019 2018 Advances $ 106 $ (2 ) $ 206 $ (30 ) Consolidated Bonds (24,859 ) (3,892 ) (42,140 ) 15,861 Total net gains (losses) $ (24,753 ) $ (3,894 ) $ (41,934 ) $ 15,831 For instruments recorded under the fair value option, the related contractual interest income and contractual interest expense are recorded as part of net interest income on the Statements of Income. The remaining changes in fair value for instruments in which the fair value option has been elected are recorded as “Net gains (losses) on financial instruments held under fair value option” in the Statements of Income, except for changes in fair value related to instrument specific credit risk, which are recorded in accumulated other comprehensive income in the Statement of Condition. The FHLB has determined that none of the remaining changes in fair value were related to instrument-specific credit risk for the six months ended June 30, 2019 or 2018 . In determining that there has been no change in instrument-specific credit risk period to period, the FHLB primarily considered the following factors: ▪ The FHLB is a federally chartered GSE, and as a result of this status, the FHLB’s Consolidated Obligations have historically received the same credit ratings as the government bond credit rating of the United States, even though they are not Obligations of the United States and are not guaranteed by the United States. ▪ The FHLB is jointly and severally liable with the other 10 FHLBanks for the payment of principal and interest on all Consolidated Obligations of each of the other FHLBanks. The following table reflects the difference between the aggregate unpaid principal balance outstanding and the aggregate fair value for Advances and Consolidated Bonds for which the fair value option has been elected. Table 18.4 – Aggregate Unpaid Balance and Aggregate Fair Value (in thousands) June 30, 2019 December 31, 2018 Aggregate Unpaid Principal Balance Aggregate Fair Value Aggregate Fair Value Over/(Under) Aggregate Unpaid Principal Balance Aggregate Unpaid Principal Balance Aggregate Fair Value Aggregate Fair Value Over/(Under) Aggregate Unpaid Principal Balance Advances (1) $ 10,000 $ 10,214 $ 214 $ 10,000 $ 10,008 $ 8 Consolidated Bonds 8,047,000 8,071,128 24,128 3,941,000 3,906,610 (34,390 ) (1) At June 30, 2019 and December 31, 2018 , none of the Advances were 90 days or more past due or had been placed on non-accrual status.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies [Text Block]	Commitments and Contingencies Table 19.1 - Off-Balance Sheet Commitments (in thousands) June 30, 2019 December 31, 2018 Notional Amount Expire within one year Expire after one year Total Expire within one year Expire after one year Total Standby Letters of Credit $ 15,344,284 $ 352,948 $ 15,697,232 $ 14,578,925 $ 268,395 $ 14,847,320 Commitments for standby bond purchases 20,605 56,005 76,610 23,215 54,820 78,035 Commitments to purchase mortgage loans 425,663 — 425,663 146,009 — 146,009 Unsettled Consolidated Bonds, principal amount (1) 65,000 — 65,000 92,000 — 92,000 Unsettled Consolidated Discount Notes, principal amount (1) 86,265 — 86,265 525,000 — 525,000 (1) Expiration is based on settlement period rather than underlying contractual maturity of Consolidated Obligations. Legal Proceedings . From time to time, the FHLB is subject to legal proceedings arising in the normal course of business. The FHLB would record an accrual for a loss contingency when it is probable that a loss has been incurred and the amount could be reasonably estimated. After consultation with legal counsel, management does not anticipate that ultimate liability, if any, arising out of any matters will have a material effect on the FHLB's financial condition or results of operations.

Transactions with Other FHLBank

Transactions with Other FHLBanks	6 Months Ended
	Jun. 30, 2019
Transactions with Other FHLBanks [Abstract]
Transactions with Other FHLBanks [Text Block]	Transactions with Other FHLBanks The FHLB notes all transactions with other FHLBanks on the face of its financial statements. Occasionally, the FHLB loans short-term funds to and borrows short-term funds from other FHLBanks. These loans and borrowings are transacted at then current market rates when traded. There were no such loans or borrowings outstanding at June 30, 2019 or December 31, 2018 . The following table details the average daily balance of lending and borrowing between the FHLB and other FHLBanks for the six months ended June 30 , 2019 and 2018. Table 20.1 - Lending and Borrowing Between the FHLB and Other FHLBanks (in thousands) Average Daily Balances for the Six Months Ended June 30, 2019 2018 Loans to other FHLBanks $ 5,801 $ 2,762 Borrowings from other FHLBanks — 552 In addition, the FHLB may, from time to time, assume the outstanding primary liability for Consolidated Obligations of another FHLBank (at then current market rates on the day when the transfer is traded) rather than issuing new debt for which the FHLB is the primary obligor. The FHLB then becomes the primary obligor on the transferred debt. There were no Consolidated Obligations transferred to the FHLB during the six months ended June 30, 2019 or 2018 . The FHLB had no

Transactions with Stockholders

Transactions with Stockholders	6 Months Ended
	Jun. 30, 2019
Transactions with Stockholders [Abstract]
Transactions with Stockholders [Text Block]	Transactions with Stockholders As a cooperative, the FHLB's capital stock is owned by its members, by former members that retain the stock as provided in the FHLB's Capital Plan and by nonmember institutions that have acquired members and must retain the stock to support Advances or other activities with the FHLB. All Advances are issued to members and all mortgage loans held for portfolio are purchased from members. The FHLB also maintains demand deposit accounts for members, primarily to facilitate settlement activities that are directly related to Advances and mortgage loan purchases. Additionally, the FHLB may enter into interest rate swaps with its stockholders. The FHLB may not invest in any equity securities issued by its stockholders and it has not purchased any MBS securitized by, or other direct long-term investments in, its stockholders. For financial statement purposes, the FHLB defines related parties as those members with more than 10 percent of the voting interests of the FHLB capital stock outstanding. Federal statute prescribes the voting rights of members in the election of both Member and Independent directors. For Member directorships, the Finance Agency designates the number of Member directorships in a given year and an eligible voting member may vote only for candidates seeking election in its respective state. For Independent directors, the FHLB's Board of Directors nominates candidates to be placed on the ballot in an at-large election. For both Member and Independent director elections, a member is entitled to vote one share of required capital stock, subject to a statutory limitation, for each applicable directorship. Under this limitation, the total number of votes that a member may cast is limited to the average number of shares of the FHLB's capital stock that were required to be held by all members in that state as of the record date for voting. Nonmember stockholders are not eligible to vote in director elections. Due to these statutory limitations, no member owned more than 10 percent of the voting interests of the FHLB at June 30, 2019 or December 31, 2018 . All transactions with stockholders are entered into in the ordinary course of business. Finance Agency regulations require the FHLB to offer the same pricing for Advances and other services to all members regardless of asset or transaction size, charter type, or geographic location. However, the FHLB may, in pricing its Advances, distinguish among members based upon its assessment of the credit and other risks to the FHLB of lending to any particular member or upon other reasonable criteria that may be applied equally to all members. The FHLB's policies and procedures require that such standards and criteria be applied consistently and without discrimination to all members applying for Advances. Transactions with Directors' Financial Institutions. In the ordinary course of its business, the FHLB provides products and services to members whose officers or directors serve as directors of the FHLB (Directors' Financial Institutions). Finance Agency regulations require that transactions with Directors' Financial Institutions be made on the same terms as those with any other member. The following table reflects balances with Directors' Financial Institutions for the items indicated below. The FHLB had no MBS or derivatives transactions with Directors' Financial Institutions at June 30, 2019 or December 31, 2018 . Table 21.1 - Transactions with Directors' Financial Institutions (dollars in millions) June 30, 2019 December 31, 2018 Balance % of Total (1) Balance % of Total (1) Advances $ 3,271 7.7 % $ 3,424 6.2 % MPP 602 5.8 585 5.7 Regulatory capital stock 310 8.1 419 9.6 (1) Percentage of total principal (Advances), unpaid principal balance (MPP), and regulatory capital stock. Concentrations. The following table shows regulatory capital stock balances, outstanding Advance principal balances, and unpaid principal balances of mortgage loans held for portfolio of stockholders holding five percent or more of regulatory capital stock and includes any known affiliates that are members of the FHLB. Table 21.2 - Stockholders Holding Five Percent or more of Regulatory Capital Stock (dollars in millions) Regulatory Capital Stock Advance MPP Unpaid June 30, 2019 Balance % of Total Principal Principal Balance JPMorgan Chase Bank, N.A. $ 1,065 28 % $ 11,050 $ — U.S. Bank, N.A. 456 12 4,574 18 Regulatory Capital Stock Advance MPP Unpaid December 31, 2018 Balance % of Total Principal Principal Balance JPMorgan Chase Bank, N.A. $ 1,085 25 % $ 23,400 $ — U.S. Bank, N.A. 796 18 4,574 19 The Huntington National Bank 248 6 6 486 Nonmember Affiliates. The FHLB has relationships with three nonmember affiliates, the Kentucky Housing Corporation, the Ohio Housing Finance Agency and the Tennessee Housing Development Agency. The FHLB had no investments in or borrowings to any of these nonmember affiliates at June 30, 2019 or December 31, 2018 . The FHLB has executed standby bond purchase agreements with one state housing authority whereby the FHLB, for a fee, agrees as a liquidity provider if required, to purchase and hold the authority's bonds until the designated marketing agent can find a suitable investor or the housing authority repurchases the bond according to a schedule established by the standby agreement. During the first six months of 2019 and 2018 , the FHLB was not required to purchase any bonds under these agreements.

Recently Issued Accounting St_2

Recently Issued Accounting Standards and Interpretations (Policies)	6 Months Ended
	Jun. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Finance, Loan and Lease Receivables, Held-for-investment, Allowance and Nonperforming Loans, Nonperforming Loans Policy [Policy Text Block]	Mortgage Loans Held for Portfolio - FHA The FHLB invests in fixed-rate mortgage loans secured by one-to-four family residential properties insured by the FHA. The FHLB expects to recover any losses from such loans from the FHA. Any losses from these loans that are not recovered from the FHA would be due to a claim rejection by the FHA and, as such, would be recoverable from the selling participating financial institutions. Therefore, the FHLB only has credit risk for these loans if the seller or servicer fails to pay for losses not covered by the FHA insurance. As a result, the FHLB did not establish an allowance for credit losses on its FHA insured mortgage loans. Furthermore, due to the insurance, none of these mortgage loans have been placed on non-accrual status. Mortgage Loans Held for Portfolio - Conventional Mortgage Purchase Program (MPP) The FHLB determines the allowance for conventional loans through analyses that include consideration of various data observations such as past performance, current performance, loan portfolio characteristics, collateral-related characteristics, industry data, and prevailing economic conditions. The measurement of the allowance for credit losses consists of: (1) collectively evaluating homogeneous pools of residential mortgage loans; (2) reviewing specifically identified loans for impairment; and (3) considering other relevant qualitative factors. Collectively Evaluated Mortgage Loans. The credit risk analysis of conventional loans evaluated collectively for impairment considers historical delinquency migration, applies estimated loss severities, and incorporates the associated credit enhancements in order to determine the FHLB's best estimate of probable incurred losses at the reporting date. Migration analysis is a methodology for determining, through the FHLB's experience over a historical period, the rate of default on loans. The FHLB applies migration analysis to loans based on payment status categories such as current, 30, 60, and 90 days past due. The FHLB then estimates how many loans in these categories may migrate to a loss realization event and applies a current loss severity to estimate losses. The estimated losses are then reduced by the probable cash flows resulting from available credit enhancements. To properly determine the credit enhancements available to recover estimated losses, the FHLB performs the credit risk analysis of all conventional mortgage loans at the individual Master Commitment Contract level. The Master Commitment Contract is an agreement with a member in which the member agrees to make a best efforts attempt to sell a specific dollar amount of loans to the FHLB, generally over a one-year period. Any credit enhancement cash flows that are projected and assessed as not probable of receipt do not reduce estimated losses. Individually Evaluated Mortgage Loans. Conventional mortgage loans that are considered troubled debt restructurings are specifically identified for purposes of calculating the allowance for credit losses. The FHLB measures impairment of these specifically identified loans by either estimating the present value of expected cash flows, estimating the loan's observable market price, or estimating the fair value of the collateral if the loan is collateral dependent. The FHLB removes specifically identified loans evaluated for impairment from the collectively evaluated mortgage loan population. Qualitative Factors. The FHLB also assesses other qualitative factors in its estimation of loan losses for the collectively evaluated population. This amount represents a subjective management judgment, based on facts and circumstances that exist as of the reporting date, which is intended to cover other incurred losses that may not otherwise be captured in the methodology described above.
Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block]	A loan considered a troubled debt restructuring is individually evaluated for impairment when determining its related allowance for credit losses. Credit loss is measured by estimating expected cash shortfalls incurred as of the reporting date.
Segment Reporting, Policy [Policy Text Block]	The FHLB has identified two primary operating segments based on its method of internal reporting: Traditional Member Finance and the MPP. These segments reflect the FHLB's two primary Mission Asset Activities and the manner in which they are managed from the perspective of development, resource allocation, product delivery, pricing, credit risk and operational administration. The segments identify the principal ways the FHLB provides services to member stockholders.
Fair Value of Financial Instruments, Policy [Policy Text Block]	The fair value amounts recorded on the Statements of Condition and presented in the related note disclosures have been determined by the FHLB using available market information and the FHLB's best judgment of appropriate valuation methods. GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (i.e., an exit price). The fair values reflect the FHLB's judgment of how a market participant would estimate the fair values.
Fair Value Transfer, Policy [Policy Text Block]	The FHLB reviews the fair value hierarchy classifications on a quarterly basis. Changes in the observability of the valuation inputs may result in a reclassification of certain financial assets or liabilities. Such reclassifications would be reported as transfers in/out at fair value as of the beginning of the quarter in which the changes occur.

Trading Securities (Tables)

Trading Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Trading Securities (and Certain Trading Assets) [Table Text Block]	Trading Securities by Major Security Types (in thousands) Fair Value June 30, 2019 December 31, 2018 Non-mortgage-backed securities (non-MBS): U.S. Treasury obligations $ 7,055,007 $ — GSE obligations 1,706,153 223,368 Total non-MBS 8,761,160 223,368 Mortgage-backed securities (MBS): U.S. obligation single-family MBS 538 612 Total $ 8,761,698 $ 223,980
Gain (Loss) on Securities [Table Text Block]	Net Gains (Losses) on Trading Securities (in thousands) Six Months Ended June 30, 2019 2018 Net gains (losses) on trading securities held at period end $ 193,587 $ (5 ) Net gains (losses) on trading securities $ 193,587 $ (5 )

Available-for-Sale Securities (

Available-for-Sale Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Securities, Available-for-sale [Abstract]
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	Available-for-Sale Securities by Major Security Types (in thousands) June 30, 2019 Amortized Cost (1) Gross Unrealized Gains Gross Unrealized Losses Fair Value Certificates of deposit $ 850,000 $ 35 $ — $ 850,035 GSE obligations 129,304 138 (533 ) 128,909 Total $ 979,304 $ 173 $ (533 ) $ 978,944 December 31, 2018 Amortized Cost (1) Gross Unrealized Gains Gross Unrealized Losses Fair Value Certificates of deposit $ 2,350,000 $ 71 $ (69 ) $ 2,350,002 GSE obligations 53,007 16 (128 ) 52,895 Total $ 2,403,007 $ 87 $ (197 ) $ 2,402,897 (1) Amortized cost of available-for-sale securities includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments.
Investments Classified by Contractual Maturity Date [Table Text Block]	Available-for-Sale Securities by Contractual Maturity (in thousands) June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost Fair Value Amortized Cost Fair Value Due in 1 year or less $ 850,000 $ 850,035 $ 2,350,000 $ 2,350,002 Due after 1 year through 5 years — — — — Due after 5 years through 10 years 119,695 119,202 48,999 48,904 Due after 10 years 9,609 9,707 4,008 3,991 Total $ 979,304 $ 978,944 $ 2,403,007 $ 2,402,897 June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost (1) Fair Value Amortized Cost (1) Fair Value Non-MBS: Due in 1 year or less $ 34,760 $ 34,764 $ 35,667 $ 35,661 Due after 1 year through 5 years — — — — Due after 5 years through 10 years — — — — Due after 10 years — — — — Total non-MBS 34,760 34,764 35,667 35,661 MBS (2) 15,312,408 15,294,772 15,755,555 15,539,707 Total $ 15,347,168 $ 15,329,536 $ 15,791,222 $ 15,575,368 (1) Carrying value equals amortized cost. (2) MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees.
Schedule of Interest Rate Payment Terms For Investments [Table Text Block]	Interest Rate Payment Terms of Available-for-Sale Securities (in thousands) June 30, 2019 December 31, 2018 Amortized cost of available-for-sale securities: Fixed-rate $ 979,304 $ 2,403,007 June 30, 2019 December 31, 2018 Amortized cost of non-MBS: Fixed-rate $ 34,760 $ 35,667 Total amortized cost of non-MBS 34,760 35,667 Amortized cost of MBS: Fixed-rate 6,112,467 6,652,055 Variable-rate 9,199,941 9,103,500 Total amortized cost of MBS 15,312,408 15,755,555 Total $ 15,347,168 $ 15,791,222

Held-to-Maturity Securities (Ta

Held-to-Maturity Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Securities, Held-to-maturity [Abstract]
Debt Securities, Held-to-maturity [Table Text Block]	Held-to-Maturity Securities by Major Security Types (in thousands) June 30, 2019 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value Non-MBS: U.S. Treasury obligations $ 34,760 $ 4 $ — $ 34,764 Total non-MBS 34,760 4 — 34,764 MBS: U.S. obligation single-family MBS 1,871,911 5,903 (608 ) 1,877,206 GSE single-family MBS 5,082,144 34,934 (38,252 ) 5,078,826 GSE multi-family MBS 8,358,353 652 (20,265 ) 8,338,740 Total MBS 15,312,408 41,489 (59,125 ) 15,294,772 Total $ 15,347,168 $ 41,493 $ (59,125 ) $ 15,329,536 December 31, 2018 Amortized Cost (1) Gross Unrecognized Holding Gains Gross Unrecognized Holding Losses Fair Value Non-MBS: U.S. Treasury obligations $ 35,667 $ — $ (6 ) $ 35,661 Total non-MBS 35,667 — (6 ) 35,661 MBS: U.S. obligation single-family MBS 2,040,642 540 (47,463 ) 1,993,719 GSE single-family MBS 5,543,524 9,891 (162,097 ) 5,391,318 GSE multi-family MBS 8,171,389 1,739 (18,458 ) 8,154,670 Total MBS 15,755,555 12,170 (228,018 ) 15,539,707 Total $ 15,791,222 $ 12,170 $ (228,024 ) $ 15,575,368 (1) Carrying value equals amortized cost.
Premiums (Discounts) Included in Amortized Cost of Securities [Table Text Block]	Net Purchased Premiums Included in the Amortized Cost of MBS Classified as Held-to-Maturity (in thousands) June 30, 2019 December 31, 2018 Premiums $ 36,886 $ 42,299 Discounts (16,248 ) (19,730 ) Net purchased premiums $ 20,638 $ 22,569
Schedule of Unrealized Loss on Investments [Table Text Block]	Held-to-Maturity Securities in a Continuous Unrealized Loss Position (in thousands) June 30, 2019 Less than 12 Months 12 Months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses MBS: U.S. obligation single-family MBS $ 45,099 $ (6 ) $ 219,830 $ (602 ) $ 264,929 $ (608 ) GSE single-family MBS 23,675 (30 ) 3,041,562 (38,222 ) 3,065,237 (38,252 ) GSE multi-family MBS 4,431,699 (12,341 ) 2,581,943 (7,924 ) 7,013,642 (20,265 ) Total $ 4,500,473 $ (12,377 ) $ 5,843,335 $ (46,748 ) $ 10,343,808 $ (59,125 ) December 31, 2018 Less than 12 Months 12 Months or more Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-MBS: U.S. Treasury obligations $ 35,661 $ (6 ) $ — $ — $ 35,661 $ (6 ) Total non-MBS 35,661 (6 ) — — 35,661 (6 ) MBS: U.S. obligation single-family MBS 175,663 (1,571 ) 1,526,835 (45,892 ) 1,702,498 (47,463 ) GSE single-family MBS 401,509 (1,581 ) 3,859,608 (160,516 ) 4,261,117 (162,097 ) GSE multi-family MBS 5,976,323 (18,185 ) 229,739 (273 ) 6,206,062 (18,458 ) Total MBS 6,553,495 (21,337 ) 5,616,182 (206,681 ) 12,169,677 (228,018 ) Total $ 6,589,156 $ (21,343 ) $ 5,616,182 $ (206,681 ) $ 12,205,338 $ (228,024 )
Investments Classified by Contractual Maturity Date [Table Text Block]	Available-for-Sale Securities by Contractual Maturity (in thousands) June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost Fair Value Amortized Cost Fair Value Due in 1 year or less $ 850,000 $ 850,035 $ 2,350,000 $ 2,350,002 Due after 1 year through 5 years — — — — Due after 5 years through 10 years 119,695 119,202 48,999 48,904 Due after 10 years 9,609 9,707 4,008 3,991 Total $ 979,304 $ 978,944 $ 2,403,007 $ 2,402,897 June 30, 2019 December 31, 2018 Year of Maturity Amortized Cost (1) Fair Value Amortized Cost (1) Fair Value Non-MBS: Due in 1 year or less $ 34,760 $ 34,764 $ 35,667 $ 35,661 Due after 1 year through 5 years — — — — Due after 5 years through 10 years — — — — Due after 10 years — — — — Total non-MBS 34,760 34,764 35,667 35,661 MBS (2) 15,312,408 15,294,772 15,755,555 15,539,707 Total $ 15,347,168 $ 15,329,536 $ 15,791,222 $ 15,575,368 (1) Carrying value equals amortized cost. (2) MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees.
Schedule of Interest Rate Payment Terms For Investments [Table Text Block]	Interest Rate Payment Terms of Available-for-Sale Securities (in thousands) June 30, 2019 December 31, 2018 Amortized cost of available-for-sale securities: Fixed-rate $ 979,304 $ 2,403,007 June 30, 2019 December 31, 2018 Amortized cost of non-MBS: Fixed-rate $ 34,760 $ 35,667 Total amortized cost of non-MBS 34,760 35,667 Amortized cost of MBS: Fixed-rate 6,112,467 6,652,055 Variable-rate 9,199,941 9,103,500 Total amortized cost of MBS 15,312,408 15,755,555 Total $ 15,347,168 $ 15,791,222

Advances Advances (Tables)

Advances Advances (Tables)	6 Months Ended
	Jun. 30, 2019
Advances [Abstract]
Schedule Of Federal Home Loan Bank Advances By Year Of Contractual Maturity [Table Text Block]	Advances by Redemption Term or Next Call Date (in thousands) Redemption Term or Next Call Date June 30, 2019 December 31, 2018 Overdrawn demand deposit accounts $ 24 $ — Due in 1 year or less 31,542,242 43,793,555 Due after 1 year through 2 years 5,175,065 4,338,117 Due after 2 years through 3 years 1,817,431 3,490,580 Due after 3 years through 4 years 899,435 753,716 Due after 4 years through 5 years 1,280,997 905,189 Thereafter 2,039,342 1,591,015 Total principal amount $ 42,754,536 $ 54,872,172 June 30, 2019 December 31, 2018 Total fixed-rate (1) $ 25,161,613 $ 23,988,298 Total variable-rate (1) 17,592,923 30,883,874 Total principal amount $ 42,754,536 $ 54,872,172 (1) Payment terms based on current interest rate terms, which reflect any option exercises or rate conversions that have occurred subsequent to the related Advance issuance. Redemption Term or Next Put Date June 30, 2019 December 31, 2018 Overdrawn demand deposit accounts $ 24 $ — Due in 1 year or less 28,434,638 38,827,494 Due after 1 year through 2 years 4,731,314 6,611,276 Due after 2 years through 3 years 2,990,529 3,221,830 Due after 3 years through 4 years 1,180,689 1,145,118 Due after 4 years through 5 years 1,218,000 835,439 Thereafter 4,199,342 4,231,015 Total principal amount $ 42,754,536 $ 54,872,172 June 30, 2019 December 31, 2018 Principal % of Total Principal Amount of Advances Principal % of Total Principal Amount of Advances JPMorgan Chase Bank, N.A. $ 11,050 26 % JPMorgan Chase Bank, N.A. $ 23,400 43 % U.S. Bank, N.A. 4,574 11 U.S. Bank, N.A. 4,574 8 Third Federal Savings and Loan Association 3,826 9 Third Federal Savings and Loan Association 3,727 7 Nationwide Life Insurance Company 2,306 5 Total $ 31,701 58 % Total $ 21,756 51 % June 30, 2019 December 31, 2018 Redemption Term Amount Weighted Average Interest Rate Amount Weighted Average Interest Rate Overdrawn demand deposit accounts $ 24 2.33 % $ — — % Due in 1 year or less 27,837,138 2.46 38,592,494 2.56 Due after 1 year through 2 years 4,371,314 2.27 6,461,276 2.39 Due after 2 years through 3 years 2,783,029 2.37 3,146,830 2.30 Due after 3 years through 4 years 1,215,689 2.56 1,145,118 2.56 Due after 4 years through 5 years 1,508,000 2.59 935,439 2.76 Thereafter 5,039,342 2.83 4,591,015 2.98 Total principal amount 42,754,536 2.49 54,872,172 2.56 Commitment fees (407 ) (456 ) Discount on Affordable Housing Program (AHP) Advances (3,764 ) (4,386 ) Premiums 1,366 1,510 Discounts (2,670 ) (3,090 ) Hedging adjustments 119,906 (43,506 ) Fair value option valuation adjustments and accrued interest 214 8 Total $ 42,869,181 $ 54,822,252

Mortgage Loans Held for Portf_2

Mortgage Loans Held for Portfolio (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Mortgage Loans Held for Portfolio [Table Text Block]	Mortgage Loans Held for Portfolio by Collateral/Guarantee Type (in thousands) June 30, 2019 December 31, 2018 Unpaid principal balance: Conventional mortgage loans $ 10,150,600 $ 9,999,307 Federal Housing Administration (FHA) mortgage loans 252,697 272,847 Total unpaid principal balance $ 10,403,297 $ 10,272,154 June 30, 2019 December 31, 2018 Unpaid principal balance: Fixed rate medium-term single-family mortgage loans (1) $ 849,168 $ 933,340 Fixed rate long-term single-family mortgage loans 9,554,129 9,338,814 Total unpaid principal balance 10,403,297 10,272,154 Premiums 226,444 227,161 Discounts (2,410 ) (2,603 ) Hedging basis adjustments (2) 12,142 5,045 Total mortgage loans held for portfolio $ 10,639,473 $ 10,501,757 (1) Medium-term is defined as a term of 15 years or less. (2) Represents the unamortized balance of the mortgage purchase commitments' market values at the time of settlement. The market value of the commitment is included in the basis of the mortgage loan and amortized accordingly.
Members Selling Five Percent or more of Total Unpaid Principal [Table Text Block]	Members, Including Any Known Affiliates that are Members of the FHLB, and Former Members Selling Five Percent or more of Total Unpaid Principal (dollars in millions) June 30, 2019 December 31, 2018 Principal % of Total Principal % of Total Union Savings Bank $ 3,462 33 % Union Savings Bank $ 3,449 34 % Guardian Savings Bank FSB 996 10 Guardian Savings Bank FSB 987 10

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Allowance for Credit Losses on Financing Receivables [Table Text Block]	Allowance for Credit Losses and Recorded Investment on Conventional Mortgage Loans by Impairment Methodology (in thousands) June 30, 2019 December 31, 2018 Allowance for credit losses: Collectively evaluated for impairment $ 784 $ 840 Individually evaluated for impairment — — Total allowance for credit losses $ 784 $ 840 Recorded investment: Collectively evaluated for impairment $ 10,407,411 $ 10,249,169 Individually evaluated for impairment 11,139 10,554 Total recorded investment $ 10,418,550 $ 10,259,723 Three Months Ended June 30, 2019 2018 Balance, beginning of period $ 779 $ 1,068 Net recoveries (charge offs) 5 (115 ) Balance, end of period $ 784 $ 953 Six Months Ended June 30, 2019 2018 Balance, beginning of period $ 840 $ 1,190 Net charge offs (56 ) (237 ) Balance, end of period $ 784 $ 953
Changes in LRA [Table Text Block]	Changes in the LRA (in thousands) Six Months Ended June 30, 2019 LRA at beginning of year $ 213,260 Additions 8,853 Claims (10 ) Scheduled distributions (5,741 ) LRA at end of period $ 216,362
Past Due Financing Receivables [Table Text Block]	Recorded Investment in Delinquent Mortgage Loans (dollars in thousands) June 30, 2019 Conventional MPP Loans FHA Loans Total Past due 30-59 days delinquent $ 25,992 $ 13,767 $ 39,759 Past due 60-89 days delinquent 4,756 3,302 8,058 Past due 90 days or more delinquent 10,451 5,429 15,880 Total past due 41,199 22,498 63,697 Total current mortgage loans 10,377,351 233,628 10,610,979 Total mortgage loans $ 10,418,550 $ 256,126 $ 10,674,676 Other delinquency statistics: In process of foreclosure, included above (1) $ 7,388 $ 3,266 $ 10,654 Serious delinquency rate (2) 0.10 % 2.19 % 0.15 % Past due 90 days or more still accruing interest (3) $ 10,084 $ 5,429 $ 15,513 Loans on non-accrual status, included above $ 1,813 $ — $ 1,813 December 31, 2018 Conventional MPP Loans FHA Loans Total Past due 30-59 days delinquent $ 29,596 $ 14,845 $ 44,441 Past due 60-89 days delinquent 7,175 4,238 11,413 Past due 90 days or more delinquent 12,807 7,210 20,017 Total past due 49,578 26,293 75,871 Total current mortgage loans 10,210,145 250,308 10,460,453 Total mortgage loans $ 10,259,723 $ 276,601 $ 10,536,324 Other delinquency statistics: In process of foreclosure, included above (1) $ 7,557 $ 4,635 $ 12,192 Serious delinquency rate (2) 0.13 % 2.65 % 0.19 % Past due 90 days or more still accruing interest (3) $ 11,773 $ 7,210 $ 18,983 Loans on non-accrual status, included above $ 2,535 $ — $ 2,535 (1) Includes loans where the decision of foreclosure or a similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans dependent on their delinquency status. (2) Loans that are 90 days or more past due or in the process of foreclosure (including past due or current loans in the process of foreclosure) expressed as a percentage of the total loan portfolio class recorded investment amount. (3) Each conventional loan past due 90 days or more still accruing interest is on a schedule/scheduled monthly settlement basis and contains one or more credit enhancements. Loans that are well secured and in the process of collection as a result of remaining credit enhancements and schedule/scheduled settlement are not placed on non-accrual status.

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	Fair Value of Derivative Instruments (in thousands) June 30, 2019 Notional Amount of Derivatives Derivative Assets Derivative Liabilities Derivatives designated as fair value hedging instruments: Interest rate swaps $ 8,935,948 $ 8,069 $ 50,402 Derivatives not designated as hedging instruments: Interest rate swaps 16,605,194 7,253 1,980 Interest rate swaptions 3,775,000 14,135 — Forward rate agreements 503,000 231 2,236 Mortgage delivery commitments 425,663 3,060 156 Total derivatives not designated as hedging instruments 21,308,857 24,679 4,372 Total derivatives before adjustments $ 30,244,805 32,748 54,774 Netting adjustments and cash collateral (1) 195,291 (51,680 ) Total derivative assets and total derivative liabilities $ 228,039 $ 3,094 December 31, 2018 Notional Amount of Derivatives Derivative Assets Derivative Liabilities Derivatives designated as fair value hedging instruments: Interest rate swaps $ 6,207,278 $ 2,393 $ 16,810 Derivatives not designated as hedging instruments: Interest rate swaps 4,322,480 3,311 1,904 Interest rate swaptions 3,000,000 15,911 — Forward rate agreements 131,000 — 2,664 Mortgage delivery commitments 146,009 1,726 1 Total derivatives not designated as hedging instruments 7,599,489 20,948 4,569 Total derivatives before adjustments $ 13,806,767 23,341 21,379 Netting adjustments and cash collateral (1) 42,424 (16,793 ) Total derivative assets and total derivative liabilities $ 65,765 $ 4,586 (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions, and also cash collateral and related accrued interest held or placed by the FHLB with the same clearing agent and/or counterparty. Cash collateral posted and related accrued interest was (in thousands) $250,609 and $71,246 at June 30, 2019 and December 31, 2018 . Cash collateral received and related accrued interest was (in thousands) $3,638 and $12,029 at June 30, 2019 and December 31, 2018 .
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	Net Gains (Losses) on Derivatives and Hedging Activities Recorded in Non-interest Income (Loss) (in thousands) Three Months Ended June 30, 2019 2018 Derivatives designated as fair value hedging relationships: Interest rate swaps N/A $ 1,570 Derivatives not designated as hedging instruments: Economic hedges: Interest rate swaps $ (147,873 ) 5,504 Interest rate swaptions (3,024 ) (3,909 ) Forward rate agreements (4,532 ) 455 Net interest settlements (3,219 ) (14,857 ) Mortgage delivery commitments 5,863 (336 ) Total net gains (losses) related to derivatives not designated as hedging instruments (152,785 ) (13,143 ) Price alignment amount (1) 659 (19 ) Net gains (losses) on derivatives and hedging activities $ (152,126 ) $ (11,592 ) Six Months Ended June 30, 2019 2018 Derivatives designated as fair value hedging relationships: Interest rate swaps N/A $ 2,562 Derivatives not designated as hedging instruments: Economic hedges: Interest rate swaps $ (154,403 ) (18,973 ) Interest rate swaptions (15,500 ) 749 Forward rate agreements (6,699 ) 4,484 Net interest settlements (11,386 ) (22,181 ) Mortgage delivery commitments 9,219 (4,585 ) Total net gains (losses) related to derivatives not designated as hedging instruments (178,769 ) (40,506 ) Price alignment amount (1) 684 (21 ) Net gains (losses) on derivatives and hedging activities $ (178,085 ) $ (37,965 ) (1) This amount is for derivatives for which variation margin is characterized as a daily settled contract. Three Months Ended June 30, 2019 Advances Available-for-sale Securities Consolidated Bonds Total interest income (expense) recorded in the Statements of Income $ 320,763 $ 4,854 $ (300,060 ) Impact of Fair Value Hedging Relationships on the Statements of Income (1) Interest income/expense: Net interest settlements $ 11,852 $ (29 ) $ 357 Gain (loss) on derivatives (113,343 ) (4,275 ) 832 Gain (loss) on hedged items 111,791 4,085 (838 ) Effect on net interest income $ 10,300 $ (219 ) $ 351 Three Months Ended June 30, 2018 (2) Advances Consolidated Bonds Impact of Fair Value Hedging Relationships on the Statements of Income (1) Interest income/expense: Net interest settlements (3) $ 6,541 $ (1,607 ) Effect on net interest income $ 6,541 $ (1,607 ) Non-interest income (loss): Gain (loss) on derivatives $ 7,257 $ 1,276 Gain (loss) on hedged items (5,406 ) (1,557 ) Effect on non-interest income (loss) $ 1,851 $ (281 ) Six Months Ended June 30, 2019 Advances Available-for-sale Securities Consolidated Bonds Total interest income (expense) recorded in the Statements of Income $ 723,540 $ 18,413 $ (562,923 ) Impact of Fair Value Hedging Relationships on the Statements of Income (1) Interest income/expense: Net interest settlements $ 25,528 $ (44 ) $ 552 Gain (loss) on derivatives (165,937 ) (6,503 ) 1,874 Gain (loss) on hedged items 163,412 6,297 (1,999 ) Effect on net interest income $ 23,003 $ (250 ) $ 427 Six Months Ended June 30, 2018 (2) Advances Consolidated Bonds Impact of Fair Value Hedging Relationships on the Statements of Income (1) Interest income/expense: Net interest settlements (3) $ 7,434 $ (2,850 ) Effect on net interest income $ 7,434 $ (2,850 ) Non-interest income (loss): Gain (loss) on derivatives $ 50,310 $ 865 Gain (loss) on hedged items (47,569 ) (1,044 ) Effect on non-interest income (loss) $ 2,741 $ (179 ) (1) Includes interest rate swaps. (2) Prior period amounts were not conformed to new hedge accounting guidance adopted January 1, 2019. (3) Excludes (amortization)/accretion on closed fair value hedge relationships of (in thousands) $(152) for the three months ended June 30, 2018 and (in thousands) $(323) for the six months ended June 30, 2018 .
Schedule of Derivative Instruments By Type, Gain (Loss) in Statement of Financial Performance [Table Text Block]	Cumulative Basis Adjustments for Fair Value Hedges (in thousands) June 30, 2019 Hedged Item Amortized Cost of Hedged Asset/ Liability (1) Basis Adjustment for Active Hedging Relationships Included in Amortized Cost Basis Adjustments for Discontinued Hedging Relationships Included in Amortized Cost Cumulative Amount of Fair Value Hedging Basis Adjustments Advances $ 8,616,748 $ 118,868 $ 1,038 $ 119,906 Available-for-sale securities 129,304 7,304 — 7,304 Consolidated Bonds 395,788 1,803 — 1,803 (1) Includes only the portion of amortized cost representing the hedged items in fair value hedging relationships.
Offsetting Assets [Table Text Block]	Offsetting of Derivative Assets and Derivative Liabilities (in thousands) June 30, 2019 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Derivative Instruments Not Meeting Netting Requirements (1) Total Derivative Assets and Total Derivative Liabilities Derivative Assets: Uncleared $ 18,155 $ (17,456 ) $ 3,291 $ 3,990 Cleared 11,302 212,747 — 224,049 Total $ 228,039 Derivative Liabilities: Uncleared $ 50,548 $ (49,846 ) $ 2,392 $ 3,094 Cleared 1,834 (1,834 ) — — Total $ 3,094 December 31, 2018 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Derivative Instruments Not Meeting Netting Requirements (1) Total Derivative Assets and Total Derivative Liabilities Derivative Assets: Uncleared $ 20,284 $ (20,250 ) $ 1,726 $ 1,760 Cleared 1,331 62,674 — 64,005 Total $ 65,765 Derivative Liabilities: Uncleared $ 13,745 $ (11,824 ) $ 2,665 $ 4,586 Cleared 4,969 (4,969 ) — — Total $ 4,586 (1) Represents mortgage delivery commitments and forward rate agreements that are not subject to an enforceable netting agreement.
Offsetting Liabilities [Table Text Block]	Offsetting of Derivative Assets and Derivative Liabilities (in thousands) June 30, 2019 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Derivative Instruments Not Meeting Netting Requirements (1) Total Derivative Assets and Total Derivative Liabilities Derivative Assets: Uncleared $ 18,155 $ (17,456 ) $ 3,291 $ 3,990 Cleared 11,302 212,747 — 224,049 Total $ 228,039 Derivative Liabilities: Uncleared $ 50,548 $ (49,846 ) $ 2,392 $ 3,094 Cleared 1,834 (1,834 ) — — Total $ 3,094 December 31, 2018 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Derivative Instruments Not Meeting Netting Requirements (1) Total Derivative Assets and Total Derivative Liabilities Derivative Assets: Uncleared $ 20,284 $ (20,250 ) $ 1,726 $ 1,760 Cleared 1,331 62,674 — 64,005 Total $ 65,765 Derivative Liabilities: Uncleared $ 13,745 $ (11,824 ) $ 2,665 $ 4,586 Cleared 4,969 (4,969 ) — — Total $ 4,586 (1) Represents mortgage delivery commitments and forward rate agreements that are not subject to an enforceable netting agreement.

Deposits (Tables)

Deposits (Tables)	6 Months Ended
	Jun. 30, 2019
Deposits [Abstract]
Deposit Liabilities, Type [Table Text Block]	Deposits (in thousands) June 30, 2019 December 31, 2018 Interest bearing: Demand and overnight $ 658,340 $ 605,979 Term 43,850 51,600 Other 6,310 4,959 Total interest bearing 708,500 662,538 Non-interest bearing: Other 8,825 6,478 Total non-interest bearing 8,825 6,478 Total deposits $ 717,325 $ 669,016

Consolidated Obligations (Table

Consolidated Obligations (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule of Short-term Debt [Table Text Block]	Consolidated Discount Notes Outstanding (dollars in thousands) Book Value Principal Amount Weighted Average Interest Rate (1) June 30, 2019 $ 41,492,853 $ 41,556,477 2.29 % December 31, 2018 $ 46,943,632 $ 47,071,113 2.35 % (1) Represents an implied rate without consideration of concessions.
Schedule of Maturities of Long-term Debt [Table Text Block]	Consolidated Bonds Outstanding by Original Contractual Maturity or Next Call Date (in thousands) Year of Original Contractual Maturity or Next Call Date June 30, 2019 December 31, 2018 Due in 1 year or less $ 31,354,565 $ 27,173,800 Due after 1 year through 2 years 6,865,000 5,773,565 Due after 2 years through 3 years 3,661,345 5,060,595 Due after 3 years through 4 years 2,096,080 2,470,620 Due after 4 years through 5 years 1,857,580 2,231,975 Thereafter 2,879,000 2,936,635 Total principal amount $ 48,713,570 $ 45,647,190 June 30, 2019 December 31, 2018 Year of Original Contractual Maturity Amount Weighted Average Interest Rate Amount Weighted Average Interest Rate Due in 1 year or less $ 25,729,565 2.36 % $ 21,085,800 2.20 % Due after 1 year through 2 years 7,945,000 2.06 6,998,565 2.13 Due after 2 years through 3 years 5,142,345 2.33 6,829,595 2.05 Due after 3 years through 4 years 2,572,080 2.48 2,958,620 2.39 Due after 4 years through 5 years 2,694,580 2.73 3,248,975 2.63 Thereafter 4,630,000 2.96 4,525,635 2.94 Total principal amount 48,713,570 2.39 45,647,190 2.29 Premiums 67,772 75,809 Discounts (26,856 ) (29,275 ) Hedging adjustments 1,803 (196 ) Fair value option valuation adjustment and accrued interest 24,128 (34,390 ) Total $ 48,780,417 $ 45,659,138
Schedule Of Consolidated Obligation Bonds By Call Feature [Table Text Block]	Consolidated Bonds Outstanding by Call Features (in thousands) June 30, 2019 December 31, 2018 Principal Amount of Consolidated Bonds: Non-callable $ 41,936,570 $ 38,539,190 Callable 6,777,000 7,108,000 Total principal amount $ 48,713,570 $ 45,647,190 June 30, 2019 December 31, 2018 Principal Amount of Consolidated Bonds: Fixed-rate $ 32,601,570 $ 29,837,190 Variable-rate 16,102,000 15,470,000 Step-up 10,000 340,000 Total principal amount $ 48,713,570 $ 45,647,190

Affordable Housing Program (A_2

Affordable Housing Program (AHP) (Tables)	6 Months Ended
	Jun. 30, 2019
Affordable Housing Program (AHP) [Abstract]
Schedule of Activity in Affordable Housing Program Obligation [Table Text Block]	Analysis of AHP Liability (in thousands) Balance at December 31, 2018 $ 117,336 Assessments (current year additions) 15,347 Subsidy uses, net (14,277 ) Balance at June 30, 2019 $ 118,406

Capital (Tables)

Capital (Tables)	6 Months Ended
	Jun. 30, 2019
Capital [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	Capital Requirements (dollars in thousands) June 30, 2019 December 31, 2018 Minimum Requirement Actual Minimum Requirement Actual Risk-based capital $ 746,300 $ 4,866,050 $ 837,666 $ 5,366,443 Capital-to-assets ratio (regulatory) 4.00 % 5.05 % 4.00 % 5.41 % Regulatory capital $ 3,856,979 $ 4,866,050 $ 3,968,103 $ 5,366,443 Leverage capital-to-assets ratio (regulatory) 5.00 % 7.57 % 5.00 % 8.11 % Leverage capital $ 4,821,224 $ 7,299,075 $ 4,960,129 $ 8,049,665
Schedule of Mandatorily Redeemable Capital Stock by Maturity Date [Table Text Block]	Mandatorily Redeemable Capital Stock Rollforward (in thousands) Balance, December 31, 2018 $ 23,184 Capital stock subject to mandatory redemption reclassified from equity 1,178 Repurchase/redemption of mandatorily redeemable capital stock (1,801 ) Balance, June 30, 2019 $ 22,561 Contractual Year of Redemption June 30, 2019 December 31, 2018 Year 1 $ 351 $ 1,633 Year 2 20 371 Year 3 1,438 357 Year 4 1,571 1,209 Year 5 2,769 3,553 Thereafter (1) 650 624 Past contractual redemption date due to remaining activity (2) 15,762 15,437 Total $ 22,561 $ 23,184 (1) Represents mandatorily redeemable capital stock resulting from a Finance Agency rule effective February 19, 2016, that made captive insurance companies ineligible for FHLB membership. Captive insurance companies that were admitted as FHLB members prior to September 12, 2014, will have their membership terminated no later than February 19, 2021. Captive insurance companies that were admitted as FHLB members on or after September 12, 2014, had their membership terminated no later than February 19, 2017. The related mandatorily redeemable capital stock is not required to be redeemed until five years after the member's termination. (2) Represents mandatorily redeemable capital stock that is past the end of the contractual redemption period because there is activity outstanding to which the mandatorily redeemable capital stock relates.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income (Tables)	6 Months Ended
	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Accumulated Other Comprehensive Income (Loss) (in thousands) Net unrealized gains (losses) on available-for-sale securities Pension and postretirement benefits Total accumulated other comprehensive income (loss) BALANCE, MARCH 31, 2018 $ 19 $ (16,050 ) $ (16,031 ) Other comprehensive income before reclassification: Net unrealized gains (losses) 201 — 201 Reclassifications from other comprehensive income (loss) to net income: Amortization - pension and postretirement benefits — 487 487 Net current period other comprehensive income (loss) 201 487 688 BALANCE, JUNE 30, 2018 $ 220 $ (15,563 ) $ (15,343 ) BALANCE, MARCH 31, 2019 $ 77 $ (12,532 ) $ (12,455 ) Other comprehensive income before reclassification: Net unrealized gains (losses) (437 ) — (437 ) Reclassifications from other comprehensive income (loss) to net income: Amortization - pension and postretirement benefits — 516 516 Net current period other comprehensive income (loss) (437 ) 516 79 BALANCE, JUNE 30, 2019 $ (360 ) $ (12,016 ) $ (12,376 ) Net unrealized gains (losses) on available-for-sale securities Pension and postretirement benefits Total accumulated other comprehensive income (loss) BALANCE, DECEMBER 31, 2017 $ (124 ) $ (16,536 ) $ (16,660 ) Other comprehensive income before reclassification: Net unrealized gains (losses) 344 — 344 Reclassifications from other comprehensive income (loss) to net income: Amortization - pension and postretirement benefits — 973 973 Net current period other comprehensive income (loss) 344 973 1,317 BALANCE, JUNE 30, 2018 $ 220 $ (15,563 ) $ (15,343 ) BALANCE, DECEMBER 31, 2018 $ (110 ) $ (12,933 ) $ (13,043 ) Other comprehensive income before reclassification: Net unrealized gains (losses) (250 ) — (250 ) Reclassifications from other comprehensive income (loss) to net income: Amortization - pension and postretirement benefits — 917 917 Net current period other comprehensive income (loss) (250 ) 917 667 BALANCE, JUNE 30, 2019 $ (360 ) $ (12,016 ) $ (12,376 )

Pension and Postretirement Be_2

Pension and Postretirement Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	Net Periodic Benefit Cost (in thousands) Three Months Ended June 30, Defined Benefit Retirement Plan Postretirement Benefits Plan 2019 2018 2019 2018 Net Periodic Benefit Cost Service cost $ 234 $ 277 $ 3 $ 4 Interest cost 392 331 45 42 Amortization of net loss 516 487 — — Net periodic benefit cost $ 1,142 $ 1,095 $ 48 $ 46 Six Months Ended June 30, Defined Benefit Postretirement Benefits Plan 2019 2018 2019 2018 Net Periodic Benefit Cost Service cost $ 451 $ 553 $ 7 $ 9 Interest cost 775 663 90 83 Amortization of net loss 917 973 — — Net periodic benefit cost $ 2,143 $ 2,189 $ 97 $ 92

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Asset Balances by Operating Segment (in thousands) Assets Traditional Member MPP Total June 30, 2019 $ 83,339,006 $ 13,085,464 $ 96,424,470 December 31, 2018 86,042,150 13,160,423 99,202,573 Three Months Ended June 30, Traditional Member Finance MPP Total 2019 Net interest income $ 70,713 $ 26,715 $ 97,428 Non-interest income (loss) (2,109 ) (550 ) (2,659 ) Non-interest expense 20,602 2,776 23,378 Income before assessments 48,002 23,389 71,391 Affordable Housing Program assessments 4,829 2,339 7,168 Net income $ 43,173 $ 21,050 $ 64,223 2018 Net interest income $ 103,643 $ 25,548 $ 129,191 Non-interest income (loss) (10,737 ) (2,072 ) (12,809 ) Non-interest expense 19,381 2,760 22,141 Income before assessments 73,525 20,716 94,241 Affordable Housing Program assessments 7,388 2,072 9,460 Net income $ 66,137 $ 18,644 $ 84,781 Six Months Ended June 30, Traditional Member Finance MPP Total 2019 Net interest income $ 161,108 $ 58,578 $ 219,686 Non-interest income (loss) (14,064 ) (6,994 ) (21,058 ) Non-interest expense 39,992 5,809 45,801 Income before assessments 107,052 45,775 152,827 Affordable Housing Program assessments 10,769 4,578 15,347 Net income $ 96,283 $ 41,197 $ 137,480 2018 Net interest income $ 196,727 $ 50,524 $ 247,251 Non-interest income (loss) (16,927 ) 261 (16,666 ) Non-interest expense 38,245 6,020 44,265 Income before assessments 141,555 44,765 186,320 Affordable Housing Program assessments 14,235 4,477 18,712 Net income $ 127,320 $ 40,288 $ 167,608

Fair Value Disclosures Fair Val

Fair Value Disclosures Fair Value (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping [Table Text Block]	Fair Value Summary (in thousands) June 30, 2019 Fair Value Financial Instruments Carrying Value Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets: Cash and due from banks $ 21,771 $ 21,771 $ 21,771 $ — $ — $ — Interest-bearing deposits 375,120 375,120 — 375,120 — — Securities purchased under agreements to resell 3,301,185 3,301,241 — 3,301,241 — — Federal funds sold 13,680,000 13,680,000 — 13,680,000 — — Trading securities 8,761,698 8,761,698 — 8,761,698 — — Available-for-sale securities 978,944 978,944 — 978,944 — — Held-to-maturity securities 15,347,168 15,329,536 — 15,329,536 — — Advances (2) 42,869,181 42,929,502 — 42,929,502 — — Mortgage loans held for portfolio, net 10,638,689 10,773,032 — 10,762,691 10,341 — Accrued interest receivable 201,154 201,154 — 201,154 — — Derivative assets 228,039 228,039 — 32,748 — 195,291 Liabilities: Deposits 717,325 717,425 — 717,425 — — Consolidated Obligations: Discount Notes 41,492,853 41,498,903 — 41,498,903 — — Bonds (3) 48,780,417 49,077,406 — 49,077,406 — — Mandatorily redeemable capital stock 22,561 22,561 22,561 — — — Accrued interest payable 159,960 159,960 — 159,960 — — Derivative liabilities 3,094 3,094 — 54,774 — (51,680 ) Other: Standby bond purchase agreements — 601 — 601 — — (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty. (2) Includes (in thousands) $10,214 of Advances recorded under the fair value option at June 30, 2019 . (3) Includes (in thousands) $8,071,128 of Consolidated Obligation Bonds recorded under the fair value option at June 30, 2019 . December 31, 2018 Fair Value Financial Instruments Carrying Value Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets: Cash and due from banks $ 10,037 $ 10,037 $ 10,037 $ — $ — $ — Interest-bearing deposits 122 122 — 122 — — Securities purchased under agreements to resell 4,402,208 4,402,237 — 4,402,237 — — Federal funds sold 10,793,000 10,793,000 — 10,793,000 — — Trading securities 223,980 223,980 — 223,980 — — Available-for-sale securities 2,402,897 2,402,897 — 2,402,897 — — Held-to-maturity securities 15,791,222 15,575,368 — 15,575,368 — — Advances (2) 54,822,252 54,736,645 — 54,736,645 — — Mortgage loans held for portfolio, net 10,500,917 10,329,982 — 10,317,010 12,972 — Accrued interest receivable 169,982 169,982 — 169,982 — — Derivative assets 65,765 65,765 — 23,341 — 42,424 Liabilities: Deposits 669,016 668,947 — 668,947 — — Consolidated Obligations: Discount Notes 46,943,632 46,944,523 — 46,944,523 — — Bonds (3) 45,659,138 45,385,615 — 45,385,615 — — Mandatorily redeemable capital stock 23,184 23,184 23,184 — — — Accrued interest payable 147,337 147,337 — 147,337 — — Derivative liabilities 4,586 4,586 — 21,379 — (16,793 ) Other: Standby bond purchase agreements — 443 — 443 — — (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty. (2) Includes (in thousands) $10,008 of Advances recorded under the fair value option at December 31, 2018 . (3) Includes (in thousands) $3,906,610 of Consolidated Obligation Bonds recorded under the fair value option at December 31, 2018 .
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	Fair Value Measurements (in thousands) Fair Value Measurements at June 30, 2019 Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Recurring fair value measurements - Assets Trading securities: U.S. Treasury obligations $ 7,055,007 $ — $ 7,055,007 $ — $ — GSE obligations 1,706,153 — 1,706,153 — — U.S. obligation single-family MBS 538 — 538 — — Total trading securities 8,761,698 — 8,761,698 — — Available-for-sale securities: Certificates of deposit 850,035 — 850,035 — — GSE obligations 128,909 — 128,909 — — Total available-for-sale securities 978,944 — 978,944 — — Advances 10,214 — 10,214 — — Derivative assets: Interest rate related 224,748 — 29,457 — 195,291 Forward rate agreements 231 — 231 — — Mortgage delivery commitments 3,060 — 3,060 — — Total derivative assets 228,039 — 32,748 — 195,291 Total assets at fair value $ 9,978,895 $ — $ 9,783,604 $ — $ 195,291 Recurring fair value measurements - Liabilities Consolidated Obligation Bonds $ 8,071,128 $ — $ 8,071,128 $ — $ — Derivative liabilities: Interest rate related 702 — 52,382 — (51,680 ) Forward rate agreements 2,236 — 2,236 — — Mortgage delivery commitments 156 — 156 — — Total derivative liabilities 3,094 — 54,774 — (51,680 ) Total liabilities at fair value $ 8,074,222 $ — $ 8,125,902 $ — $ (51,680 ) (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty. Fair Value Measurements at December 31, 2018 Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Recurring fair value measurements - Assets Trading securities: GSE obligations $ 223,368 $ — $ 223,368 $ — $ — U.S. obligation single-family MBS 612 — 612 — — Total trading securities 223,980 — 223,980 — — Available-for-sale securities: Certificates of deposit 2,350,002 — 2,350,002 — — GSE obligations 52,895 — 52,895 — — Total available-for-sale securities 2,402,897 — 2,402,897 — — Advances 10,008 — 10,008 — — Derivative assets: Interest rate related 64,039 — 21,615 — 42,424 Mortgage delivery commitments 1,726 — 1,726 — — Total derivative assets 65,765 — 23,341 — 42,424 Total assets at fair value $ 2,702,650 $ — $ 2,660,226 $ — $ 42,424 Recurring fair value measurements - Liabilities Consolidated Obligation Bonds $ 3,906,610 $ — $ 3,906,610 $ — $ — Derivative liabilities: Interest rate related 1,921 — 18,714 — (16,793 ) Forward rate agreements 2,664 — 2,664 — — Mortgage delivery commitments 1 — 1 — — Total derivative liabilities 4,586 — 21,379 — (16,793 ) Total liabilities at fair value $ 3,911,196 $ — $ 3,927,989 $ — $ (16,793 ) Nonrecurring fair value measurements - Assets (2) Mortgage loans held for portfolio $ 311 $ — $ — $ 311 (1) Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty. (2) The fair value information presented is as of the date the fair value adjustment was recorded during the year ended December 31, 2018 .
Fair Value Option, Disclosures [Table Text Block]	Fair Value Option - Financial Assets and Liabilities (in thousands) Three Months Ended June 30, Six Months Ended June 30, Net Gains (Losses) from Changes in Fair Value Recognized in Earnings 2019 2018 2019 2018 Advances $ 106 $ (2 ) $ 206 $ (30 ) Consolidated Bonds (24,859 ) (3,892 ) (42,140 ) 15,861 Total net gains (losses) $ (24,753 ) $ (3,894 ) $ (41,934 ) $ 15,831 June 30, 2019 December 31, 2018 Aggregate Unpaid Principal Balance Aggregate Fair Value Aggregate Fair Value Over/(Under) Aggregate Unpaid Principal Balance Aggregate Unpaid Principal Balance Aggregate Fair Value Aggregate Fair Value Over/(Under) Aggregate Unpaid Principal Balance Advances (1) $ 10,000 $ 10,214 $ 214 $ 10,000 $ 10,008 $ 8 Consolidated Bonds 8,047,000 8,071,128 24,128 3,941,000 3,906,610 (34,390 ) (1) At June 30, 2019 and December 31, 2018 , none of the Advances were 90 days or more past due or had been placed on non-accrual status.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Off-Balance Sheet Commitments [Table Text Block]	Off-Balance Sheet Commitments (in thousands) June 30, 2019 December 31, 2018 Notional Amount Expire within one year Expire after one year Total Expire within one year Expire after one year Total Standby Letters of Credit $ 15,344,284 $ 352,948 $ 15,697,232 $ 14,578,925 $ 268,395 $ 14,847,320 Commitments for standby bond purchases 20,605 56,005 76,610 23,215 54,820 78,035 Commitments to purchase mortgage loans 425,663 — 425,663 146,009 — 146,009 Unsettled Consolidated Bonds, principal amount (1) 65,000 — 65,000 92,000 — 92,000 Unsettled Consolidated Discount Notes, principal amount (1) 86,265 — 86,265 525,000 — 525,000 (1) Expiration is based on settlement period rather than underlying contractual maturity of Consolidated Obligations.

Transactions with Other FHLBa_2

Transactions with Other FHLBanks (Tables)	6 Months Ended
	Jun. 30, 2019
Other FHLBanks [Member]
Schedule of Other Transactions [Line Items]
Schedule of Other Transactions by Balance Sheet Grouping [Table Text Block]	Lending and Borrowing Between the FHLB and Other FHLBanks (in thousands) Average Daily Balances for the Six Months Ended June 30, 2019 2018 Loans to other FHLBanks $ 5,801 $ 2,762 Borrowings from other FHLBanks — 552

Transactions with Stockholders

Transactions with Stockholders (Tables)	6 Months Ended
	Jun. 30, 2019
Schedule of Other Transactions [Line Items]
Schedule of Transactions with Members and Former Members [Table Text Block]	Stockholders Holding Five Percent or more of Regulatory Capital Stock (dollars in millions) Regulatory Capital Stock Advance MPP Unpaid June 30, 2019 Balance % of Total Principal Principal Balance JPMorgan Chase Bank, N.A. $ 1,065 28 % $ 11,050 $ — U.S. Bank, N.A. 456 12 4,574 18 Regulatory Capital Stock Advance MPP Unpaid December 31, 2018 Balance % of Total Principal Principal Balance JPMorgan Chase Bank, N.A. $ 1,085 25 % $ 23,400 $ — U.S. Bank, N.A. 796 18 4,574 19 The Huntington National Bank 248 6 6 486
Director [Member]
Schedule of Other Transactions [Line Items]
Schedule of Other Transactions by Balance Sheet Grouping [Table Text Block]	Transactions with Directors' Financial Institutions (dollars in millions) June 30, 2019 December 31, 2018 Balance % of Total (1) Balance % of Total (1) Advances $ 3,271 7.7 % $ 3,424 6.2 % MPP 602 5.8 585 5.7 Regulatory capital stock 310 8.1 419 9.6 (1) Percentage of total principal (Advances), unpaid principal balance (MPP), and regulatory capital stock.

Background Information (Details

Background Information (Details)	Jun. 30, 2019Banks
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Federal Home Loan Banks	11

Recently Issued Accounting St_3

Recently Issued Accounting Standards and Interpretations Narrative (Details)	Jan. 01, 2019USD ($)
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Operating Lease, Right-of-Use Asset	$ 5,473,000
Operating Lease, Liability	$ 6,141,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities

Trading Securities (Trading Sec

Trading Securities (Trading Securities by Major Type) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 8,761,698	$ 223,980
US Treasury Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	7,055,007	0
US Government-sponsored Enterprises Debt Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	1,706,153	223,368
Other Than Mortgage Backed Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	8,761,160	223,368
Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 538	$ 612

Trading Securities (Net (Losses

Trading Securities (Net (Losses) Gains on Trading Securities) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Debt Securities, Trading, Unrealized Gain (Loss)	$ 193,587	$ (5)
Debt Securities, Trading, Gain (Loss)	$ 193,587	$ (5)

Available-for-Sale Securities N

Available-for-Sale Securities Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment	$ 0	$ 0

Available-for-Sale Securities M

Available-for-Sale Securities Major Security Type (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[1]	$ 979,304	$ 2,403,007
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		173	87
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(533)	(197)
Available-for-sale securities		978,944	2,402,897
Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[1]	850,000	2,350,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		35	71
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0	(69)
Available-for-sale securities		850,035	2,350,002
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[1]	129,304	53,007
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		138	16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(533)	(128)
Available-for-sale securities		$ 128,909	$ 52,895
[1]	Amortized cost of available-for-sale securities includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments.

Available-for-Sale Securities C

Available-for-Sale Securities Contractual Maturity (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost		$ 850,000	$ 2,350,000
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost		0	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost		119,695	48,999
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost		9,609	4,008
Debt Securities, Available-for-sale, Amortized Cost	[1]	979,304	2,403,007
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value		850,035	2,350,002
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value		0	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value		119,202	48,904
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value		9,707	3,991
Available-for-sale securities		$ 978,944	$ 2,402,897
[1]	Amortized cost of available-for-sale securities includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments.

Available-for-Sale Securities I

Available-for-Sale Securities Interest Rate Payment Terms (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[1]	$ 979,304	$ 2,403,007
Fixed-rate [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 979,304	$ 2,403,007
[1]	Amortized cost of available-for-sale securities includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments.

Held-to-Maturity Securities Nar

Held-to-Maturity Securities Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Debt Securities, Held-to-maturity [Abstract]
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss), Excluding Other-than-temporary Impairment	$ 0	$ 0

Held-to-Maturity Securities (Ma

Held-to-Maturity Securities (Major Security Types) (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2]	$ 15,347,168	$ 15,791,222
Debt Securities, Held-to-maturity	[3]	15,347,168	15,791,222
Held-to-maturity Securities, Unrecognized Holding Gain		41,493	12,170
Held-to-maturity Securities, Unrecognized Holding Loss		(59,125)	(228,024)
Debt Securities, Held-to-maturity, Fair Value		15,329,536	15,575,368
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[2]	34,760	35,667
Debt Securities, Held-to-maturity		34,760	35,667
Held-to-maturity Securities, Unrecognized Holding Gain		4	0
Held-to-maturity Securities, Unrecognized Holding Loss		0	(6)
Debt Securities, Held-to-maturity, Fair Value		34,764	35,661
Other Than Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2]	34,760	35,667
Debt Securities, Held-to-maturity		34,760	35,667
Held-to-maturity Securities, Unrecognized Holding Gain		4	0
Held-to-maturity Securities, Unrecognized Holding Loss		0	(6)
Debt Securities, Held-to-maturity, Fair Value		34,764	35,661
Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[2]	1,871,911	2,040,642
Debt Securities, Held-to-maturity		1,871,911	2,040,642
Held-to-maturity Securities, Unrecognized Holding Gain		5,903	540
Held-to-maturity Securities, Unrecognized Holding Loss		(608)	(47,463)
Debt Securities, Held-to-maturity, Fair Value		1,877,206	1,993,719
Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2],[4]	15,312,408	15,755,555
Debt Securities, Held-to-maturity	[4]	15,312,408	15,755,555
Held-to-maturity Securities, Unrecognized Holding Gain		41,489	12,170
Held-to-maturity Securities, Unrecognized Holding Loss		(59,125)	(228,018)
Debt Securities, Held-to-maturity, Fair Value	[4]	15,294,772	15,539,707
Single Family [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[2]	5,082,144	5,543,524
Debt Securities, Held-to-maturity		5,082,144	5,543,524
Held-to-maturity Securities, Unrecognized Holding Gain		34,934	9,891
Held-to-maturity Securities, Unrecognized Holding Loss		(38,252)	(162,097)
Debt Securities, Held-to-maturity, Fair Value		5,078,826	5,391,318
Multifamily [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[2]	8,358,353	8,171,389
Debt Securities, Held-to-maturity		8,358,353	8,171,389
Held-to-maturity Securities, Unrecognized Holding Gain		652	1,739
Held-to-maturity Securities, Unrecognized Holding Loss		(20,265)	(18,458)
Debt Securities, Held-to-maturity, Fair Value		$ 8,338,740	$ 8,154,670
[1]	Carrying value equals amortized cost.
[2]	Carrying value equals amortized cost.
[3]	Fair values: $15,329,536 and $15,575,368 at June 30, 2019 and December 31, 2018 , respectively.
[4]	MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees.

Held-to-Maturity Securities (Ne

Held-to-Maturity Securities (Net Premuims) (Details) - Collateralized Mortgage Backed Securities [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Held To Maturity Securities, Premiums	$ 36,886	$ 42,299
Held-to-maturity Securities, Discounts	(16,248)	(19,730)
Held-to-maturity Securities, Premiums (Discounts), Net	$ 20,638	$ 22,569

Held-to-Maturity Securities (Co

Held-to-Maturity Securities (Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 4,500,473	$ 6,589,156
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	(12,377)	(21,343)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	5,843,335	5,616,182
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(46,748)	(206,681)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	10,343,808	12,205,338
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(59,125)	(228,024)
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		35,661
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss		(6)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		35,661
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		(6)
Other Than Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		35,661
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss		(6)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		35,661
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		(6)
Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	45,099	175,663
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	(6)	(1,571)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	219,830	1,526,835
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(602)	(45,892)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	264,929	1,702,498
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(608)	(47,463)
Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		6,553,495
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss		(21,337)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		5,616,182
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(206,681)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		12,169,677
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		(228,018)
Single Family [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	23,675	401,509
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	(30)	(1,581)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	3,041,562	3,859,608
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(38,222)	(160,516)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	3,065,237	4,261,117
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(38,252)	(162,097)
Multifamily [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	4,431,699	5,976,323
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	(12,341)	(18,185)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	2,581,943	229,739
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(7,924)	(273)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	7,013,642	6,206,062
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (20,265)	$ (18,458)

Held-to-Maturity Securities (_2

Held-to-Maturity Securities (Contractual Maturity) (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2]	$ 15,347,168	$ 15,791,222
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2]	15,347,168	15,791,222
Debt Securities, Held-to-maturity	[3]	15,347,168	15,791,222
Debt Securities, Held-to-maturity, Fair Value		15,329,536	15,575,368
Other Than Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, within One Year Amortized Cost	[1]	34,760	35,667
Held-to-maturity Securities, Debt Maturities, After One Through Five Years Amortized Cost	[1]	0	0
Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years Amortized Cost	[1]	0	0
Held-to-maturity Securities, Debt Maturities, After Ten Years Amortized Cost	[1]	0	0
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2]	34,760	35,667
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2]	34,760	35,667
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost		34,760	35,667
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost		0	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost		0	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost		0	0
Debt Securities, Held-to-maturity		34,760	35,667
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value		34,764	35,661
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value		0	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value		0	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value		0	0
Debt Securities, Held-to-maturity, Fair Value		34,764	35,661
Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2],[4]	15,312,408	15,755,555
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2],[4]	15,312,408	15,755,555
Debt Securities, Held-to-maturity	[4]	15,312,408	15,755,555
Debt Securities, Held-to-maturity, Fair Value	[4]	$ 15,294,772	$ 15,539,707
[1]	Carrying value equals amortized cost.
[2]	Carrying value equals amortized cost.
[3]	Fair values: $15,329,536 and $15,575,368 at June 30, 2019 and December 31, 2018 , respectively.
[4]	MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees.

Held-to-Maturity Securities (In

Held-to-Maturity Securities (Interest Rate Payment Terms) (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2]	$ 15,347,168	$ 15,791,222
Other Than Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2]	34,760	35,667
Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	[1],[2],[3]	15,312,408	15,755,555
Fixed-rate [Member] | Other Than Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment		34,760	35,667
Fixed-rate [Member] | Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment		6,112,467	6,652,055
Variable-rate [Member] | Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment		$ 9,199,941	$ 9,103,500
[1]	Carrying value equals amortized cost.
[2]	Carrying value equals amortized cost.
[3]	MBS are not presented by contractual maturity because their expected maturities will likely differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees.

Advances (Advance Redemption Te

Advances (Advance Redemption Terms) (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Advances [Abstract]
Deposit Liabilities Reclassified as Loans Receivable		$ 24	$ 0
Due in 1 year or less		27,837,138	38,592,494
Due after 1 year through 2 years		4,371,314	6,461,276
Due after 2 years through 3 years		2,783,029	3,146,830
Due after 3 years through 4 years		1,215,689	1,145,118
Due after 4 years through 5 years		1,508,000	935,439
Thereafter		5,039,342	4,591,015
Federal Home Loan Bank, Advances, Par Value, Total		42,754,536	54,872,172
Commitment Fees on Advances		(407)	(456)
Discount on Affordable Housing Program Advances		(3,764)	(4,386)
Federal Home Loan Bank Advances, Premium		1,366	1,510
Federal Home Loan Bank Advances, Discount		(2,670)	(3,090)
Hedging adjustments		119,906	(43,506)
Federal Home Loan Bank, Advances, Valuation Adjustments under Fair Value Option	[1]	214	8
Advances		$ 42,869,181	$ 54,822,252
Weighted Average Interest Rate on Overdrawn Demand Deposit		2.33%	0.00%
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing Within One Year of Balance Sheet Date		2.46%	2.56%
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing From One To Two Years of Balance Sheet Date		2.27%	2.39%
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing From Two To Three Years of Balance Sheet Date		2.37%	2.30%
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing From Three To Four Years of Balance Sheet Date		2.56%	2.56%
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing From Four To Five Years of Balance Sheet Date		2.59%	2.76%
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing After Five Years of Balance Sheet Date		2.83%	2.98%
Federal Home Loan Bank Advances, Weighted Average Interest Rate As Of Balance Sheet Date		2.49%	2.56%
[1]	At June 30, 2019 and December 31, 2018 , none of the Advances were 90 days or more past due or had been placed on non-accrual status.

Advances (Year of Contractual M

Advances (Year of Contractual Maturity or Next Call Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Advances [Abstract]
Deposit Liabilities Reclassified as Loans Receivable	$ 24	$ 0
Federal Home Loan Bank Advances, Earlier of Contractual Maturity or Next Call Date, Due With in Next Rolling Twelve Months	31,542,242	43,793,555
Federal Home Loan Bank Advances Earlier of Contractual Maturity or Next Call Date Due in Rolling Year Two	5,175,065	4,338,117
Federal Home Loan Bank Advances Earlier of Contractual Maturity or Next Call Date Due in Rolling Year Three	1,817,431	3,490,580
Federal Home Loan Bank Advances Earlier of Contractual Maturity or Next Call Date Due in Rolling Year Four	899,435	753,716
Federal Home Loan Bank Advances Earlier of Contractual Maturity or Next Call Date Due in Rolling Year Five	1,280,997	905,189
Federal Home Loan Bank Advances Earlier of Contractual Maturity or Next Call Date Due After Rolling Year Five	2,039,342	1,591,015
Federal Home Loan Bank, Advances, Par Value, Total	$ 42,754,536	$ 54,872,172

Advances (Advances by Year of C

Advances (Advances by Year of Contractual Maturity or Next Put/Convert Date for Putable/Convertible Advances) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Advances [Abstract]
Deposit Liabilities Reclassified as Loans Receivable	$ 24	$ 0
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put Date, Due within One Year of Balance Sheet Date	28,434,638	38,827,494
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put Date, Due From One To Two Years of Balance Sheet Date	4,731,314	6,611,276
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put Date, Due From Two To Three Years of Balance Sheet Date	2,990,529	3,221,830
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put Date, Due From Three To Four Years of Balance Sheet Date	1,180,689	1,145,118
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put Date, Due From Four To Five Years of Balance Sheet Date	1,218,000	835,439
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put Date, Due After Five Years of Balance Sheet Date	4,199,342	4,231,015
Federal Home Loan Bank, Advances, Par Value, Total	$ 42,754,536	$ 54,872,172

Advances (Advances by Interest

Advances (Advances by Interest Rate Payment Terms) (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Advances [Abstract]
Federal Home Loan Bank Advances, Maturities by Interest Rate Type, Fixed Rate	[1]	$ 25,161,613	$ 23,988,298
Federal Home Loan Bank Advances, Maturities by Interest Rate Type, Floating Rate	[1]	17,592,923	30,883,874
Federal Home Loan Bank, Advances, Par Value, Total		$ 42,754,536	$ 54,872,172
[1]	Payment terms based on current interest rate terms, which reflect any option exercises or rate conversions that have occurred subsequent to the related Advance issuance.

Advances (Borrowers Holding Fiv

Advances (Borrowers Holding Five Percent or more of Total Advances) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 42,754,536	$ 54,872,172
Federal Home Loan Bank Borrower Advances, Five Percent Or More Of Principal Balance [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 21,756,000	$ 31,701,000
Concentration Risk, Percentage, Five Percent or More Of Principal Balance	51.00%	58.00%
JPMorgan Chase Bank National Association [Member] | Federal Home Loan Bank Borrower Advances, Five Percent Or More Of Principal Balance [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 11,050,000	$ 23,400,000
Concentration Risk, Percentage, Five Percent or More Of Principal Balance	26.00%	43.00%
U.S. Bank, N.A. [Member] | Federal Home Loan Bank Borrower Advances, Five Percent Or More Of Principal Balance [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 4,574,000	$ 4,574,000
Concentration Risk, Percentage, Five Percent or More Of Principal Balance	11.00%	8.00%
Third Federal Savings and Loan Association [Member] | Federal Home Loan Bank Borrower Advances, Five Percent Or More Of Principal Balance [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 3,826,000	$ 3,727,000
Concentration Risk, Percentage, Five Percent or More Of Principal Balance	9.00%	7.00%
Nationwide Life Insurance Member [Member] | Federal Home Loan Bank Borrower Advances, Five Percent Or More Of Principal Balance [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 2,306,000
Concentration Risk, Percentage, Five Percent or More Of Principal Balance	5.00%

Mortgage Loans Held for Portf_3

Mortgage Loans Held for Portfolio (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Loans And Leases Receivable, Unpaid Principal Balance		$ 10,403,297	$ 10,272,154
Loans and Leases Receivable, Unamortized Premiums		226,444	227,161
Loans and Leases Receivable, Unamortized Discounts		(2,410)	(2,603)
Loans and Leases Receivable, Hedging Basis Adjustment	[1]	12,142	5,045
Loans and Leases Receivable, Gross, Consumer, Mortgage		10,639,473	10,501,757
Conventional Mortgage Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans And Leases Receivable, Unpaid Principal Balance		10,150,600	9,999,307
Federal Housing Administration Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans And Leases Receivable, Unpaid Principal Balance		252,697	272,847
Single Family [Member] | Loans Receivable With Fixed Rates Of Interest Medium Term [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans And Leases Receivable, Unpaid Principal Balance	[2]	849,168	933,340
Single Family [Member] | Loans Receivable With Fixed Rates Of Interest Long Term [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans And Leases Receivable, Unpaid Principal Balance		$ 9,554,129	$ 9,338,814
[1]	Represents the unamortized balance of the mortgage purchase commitments' market values at the time of settlement. The market value of the commitment is included in the basis of the mortgage loan and amortized accordingly.
[2]	Medium-term is defined as a term of 15 years or less.

Mortgage Loans Held for Portf_4

Mortgage Loans Held for Portfolio (Details 2) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Union Savings Bank [Member]
Participating Mortgage Loans [Line Items]
Unpaid Principal Balances Greater Than Five Percent of Total	$ 3,462	$ 3,449
Percent of Total	33.00%	34.00%
Guardian Saving Bank FSB [Member]
Participating Mortgage Loans [Line Items]
Unpaid Principal Balances Greater Than Five Percent of Total	$ 996	$ 987
Percent of Total	10.00%	10.00%

Allowance for Credit Losses Nar

Allowance for Credit Losses Narrative (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
Real Estate Acquired Through Foreclosure	$ 0	$ 0
Financing Receivable, Modifications, Recorded Investment	$ 11,139,000	$ 10,554,000

Allowance for Credit Losses (De

Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	$ 784		$ 840		$ 784	$ 840
Total recorded investment					10,674,676	10,536,324
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			840
Balance, end of period	784		784
Conventional Mortgage Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Credit Losses, Collectively Evaluated for Impairment					784	840
Allowance for Credit Losses, Individually Evaluated for Impairment					0	0
Loans and Leases Receivable, Allowance	779	$ 1,068	784	$ 953	784	840
Recorded Investment, Collectively Evaluated for Impairment					10,407,411	10,249,169
Recorded Investment, Individually Evaluated for Impairment					11,139	10,554
Total recorded investment					$ 10,418,550	$ 10,259,723
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	779	1,068	840	1,190
Allowance for Loan and Lease Losses Write-offs, Net	5	(115)	(56)	(237)
Balance, end of period	$ 784	$ 953	$ 784	$ 953

Allowance for Credit Losses Rol

Allowance for Credit Losses Rollforward of LRA (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Change in Lender Risk Account Balance [Roll Forward]
Lender Risk Account, Beginning Balance	$ 213,260
Lender Risk Account, Additions	8,853
Lender Risk Account, Claims	(10)
Lender Risk Account, Distributions	(5,741)
Lender Risk Account, Ending Balance	$ 216,362

Allowance for Credit Losses Sch

Allowance for Credit Losses Schedule of Loans Outstanding and Past Due (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		$ 63,697	$ 75,871
Financing Receivable, Recorded Investment, Current		10,610,979	10,460,453
Total recorded investment		10,674,676	10,536,324
Mortgage Loans In Process Of Foreclosure	[1]	$ 10,654	$ 12,192
Loans and Leases Receivable, Serious Delinquencies Ratio	[2]	0.15%	0.19%
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	[3]	$ 15,513	$ 18,983
Financing Receivable, Recorded Investment, Nonaccrual Status		1,813	2,535
Conventional Mortgage Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		41,199	49,578
Financing Receivable, Recorded Investment, Current		10,377,351	10,210,145
Total recorded investment		10,418,550	10,259,723
Mortgage Loans In Process Of Foreclosure	[1]	$ 7,388	$ 7,557
Loans and Leases Receivable, Serious Delinquencies Ratio	[2]	0.10%	0.13%
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	[3]	$ 10,084	$ 11,773
Financing Receivable, Recorded Investment, Nonaccrual Status		1,813	2,535
Federal Housing Administration Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		22,498	26,293
Financing Receivable, Recorded Investment, Current		233,628	250,308
Total recorded investment		256,126	276,601
Mortgage Loans In Process Of Foreclosure	[1]	$ 3,266	$ 4,635
Loans and Leases Receivable, Serious Delinquencies Ratio	[2]	2.19%	2.65%
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	[3]	$ 5,429	$ 7,210
Financing Receivable, Recorded Investment, Nonaccrual Status		0	0
Past due 30-59 days delinquent
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		39,759	44,441
Past due 30-59 days delinquent | Conventional Mortgage Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		25,992	29,596
Past due 30-59 days delinquent | Federal Housing Administration Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		13,767	14,845
Past due 60-89 days delinquent
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		8,058	11,413
Past due 60-89 days delinquent | Conventional Mortgage Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		4,756	7,175
Past due 60-89 days delinquent | Federal Housing Administration Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		3,302	4,238
Past due 90 days or more delinquent
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		15,880	20,017
Past due 90 days or more delinquent | Conventional Mortgage Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		10,451	12,807
Past due 90 days or more delinquent | Federal Housing Administration Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due		$ 5,429	$ 7,210
[1]	Includes loans where the decision of foreclosure or a similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans dependent on their delinquency status.
[2]	Loans that are 90 days or more past due or in the process of foreclosure (including past due or current loans in the process of foreclosure) expressed as a percentage of the total loan portfolio class recorded investment amount.
[3]	Each conventional loan past due 90 days or more still accruing interest is on a schedule/scheduled monthly settlement basis and contains one or more credit enhancements. Loans that are well secured and in the process of collection as a result of remaining credit enhancements and schedule/scheduled settlement are not placed on non-accrual status.

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities Derivatives in Statement of Condition (Details) - USD ($) $ in Thousands		Jun. 30, 2019		Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		$ 30,244,805		$ 13,806,767
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		32,748		23,341
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		54,774		21,379
Derivative Asset, Netting Adjustments And Cash Collateral	[2]	195,291	[1]	42,424	[3]
Derivative Liability, Netting Adjustments And Cash Collateral	[2]	(51,680)	[1]	(16,793)	[3]
Derivative assets		228,039		65,765
Derivative liabilities		3,094		4,586
Derivative, Collateral, Cash Posted And Related Accrued Interest		250,609		71,246
Derivative, Collateral, Cash Received And Related Accrued Interest		3,638		12,029
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		8,935,948		6,207,278
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		8,069		2,393
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		50,402		16,810
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		16,605,194		4,322,480
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		7,253		3,311
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		1,980		1,904
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swaption [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		3,775,000		3,000,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		14,135		15,911
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward Contracts [Member] | Collateralized Mortgage Backed Securities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		503,000		131,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		231		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		2,236		2,664
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		21,308,857		7,599,489
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		24,679		20,948
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4,372		4,569
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Mortgage Receivable [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		425,663		146,009
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		3,060		1,726
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ 156		$ 1
[1]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[2]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions, and also cash collateral and related accrued interest held or placed by the FHLB with the same clearing agent and/or counterparty. Cash collateral posted and related accrued interest was (in thousands) $250,609 and $71,246 at June 30, 2019 and December 31, 2018 . Cash collateral received and related accrued interest was (in thousands) $3,638 and $12,029 at June 30, 2019 and December 31, 2018 .
[3]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities Derivatives in Statement of Income and Impact on Interest (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income, Federal Home Loan Bank Advances		$ 320,763	$ 349,054	$ 723,540	$ 667,475
Interest Income, Debt Securities, Available-for-sale, Operating		4,854	10,176	18,413	13,455
Interest Expense, Consolidated Bonds		(300,060)	(246,739)	(562,923)	(469,207)
Amortization and Accretion of Hedged Items			(152)		(323)
Advances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	[1],[2]		7,257		50,310
Gain (Loss) on Hedged Item	[1],[2]		(5,406)		(47,569)
Gain (Loss) on Fair Value Hedges Recognized in Net Interest Income	[1],[2],[3]		6,541		7,434
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	[1],[2]		1,851		2,741
Consolidated Obligation Bonds [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	[1],[2]		1,276		865
Gain (Loss) on Hedged Item	[1],[2]		(1,557)		(1,044)
Gain (Loss) on Fair Value Hedges Recognized in Net Interest Income	[1],[2],[3]		(1,607)		(2,850)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	[1],[2]		$ (281)		$ (179)
Interest Income [Member] | Advances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Interest Settlements On Fair Value Hedges	[1]	11,852		25,528
Gain (Loss) on Derivative	[1]	(113,343)		(165,937)
Gain (Loss) on Hedged Item	[1]	111,791		163,412
Gain (Loss) on Fair Value Hedges Recognized in Earnings	[1]	10,300		23,003
Interest Income [Member] | Available-for-sale Securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Interest Settlements On Fair Value Hedges	[1]	(29)		(44)
Gain (Loss) on Derivative	[1]	(4,275)		(6,503)
Gain (Loss) on Hedged Item	[1]	4,085		6,297
Gain (Loss) on Fair Value Hedges Recognized in Earnings	[1]	(219)		(250)
Interest Expense [Member] | Consolidated Obligation Bonds [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Interest Settlements On Fair Value Hedges	[1]	357		552
Gain (Loss) on Derivative	[1]	832		1,874
Gain (Loss) on Hedged Item	[1]	(838)		(1,999)
Gain (Loss) on Fair Value Hedges Recognized in Earnings	[1]	$ 351		$ 427
[1]	Includes interest rate swaps.
[2]	Prior period amounts were not conformed to new hedge accounting guidance adopted January 1, 2019.
[3]	Excludes (amortization)/accretion on closed fair value hedge relationships of (in thousands) $(152) for the three months ended June 30, 2018 and (in thousands) $(323) for the six months ended June 30, 2018 .

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities Derivative Fair Value Hedges (Details) $ in Thousands	Jun. 30, 2019USD ($)
Advances [Member]
Derivatives, Fair Value [Line Items]
Hedged Asset, Fair Value Hedge	$ 8,616,748	[1]
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease)	118,868
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	1,038
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	119,906
Available-for-sale Securities [Member]
Derivatives, Fair Value [Line Items]
Hedged Asset, Fair Value Hedge	129,304	[1]
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease)	7,304
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	0
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	7,304
Consolidated Obligation Bonds [Member]
Derivatives, Fair Value [Line Items]
Hedged Liability, Fair Value Hedge	395,788	[1]
Hedged Liability, Active Fair Value Hedge, Cumulative Increase (Decrease)	1,803
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 1,803
[1]	Includes only the portion of amortized cost representing the hedged items in fair value hedging relationships.

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities Derivatives in Statement of Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives not designated as hedging instruments		$ (152,126)		$ (178,085)
Derivative Instruments, Other Gain (Loss)	[1]		$ (19)		$ (21)
Net (losses) gains on derivatives and hedging activities			(11,592)		(37,965)
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net			1,570		2,562
Gain (Loss) on Derivatives not designated as hedging instruments		(147,873)	5,504	(154,403)	(18,973)
Interest Rate Swaption [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives not designated as hedging instruments		(3,024)	(3,909)	(15,500)	749
Forward Contracts [Member] | Mortgage Receivable [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives not designated as hedging instruments		5,863	(336)	9,219	(4,585)
Forward Contracts [Member] | Collateralized Mortgage Backed Securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives not designated as hedging instruments		(4,532)	455	(6,699)	4,484
Net Interest Settlements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives not designated as hedging instruments		(3,219)	(14,857)	(11,386)	(22,181)
Derivatives Not Designated As Hedging Before Price Alignment [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives not designated as hedging instruments		(152,785)	$ (13,143)	(178,769)	$ (40,506)
Price Alignment Amount [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivatives not designated as hedging instruments	[1]	$ 659		$ 684
[1]	This amount is for derivatives for which variation margin is characterized as a daily settled contract.

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities Offsetting of Derivative Assets and Derivative Liabilities (Details) - USD ($) $ in Thousands		Jun. 30, 2019		Dec. 31, 2018
Offsetting Assets [Line Items]
Derivative Asset, Netting Adjustments And Cash Collateral	[2]	$ 195,291	[1]	$ 42,424	[3]
Derivative assets		228,039		65,765
Derivative Liability, Netting Adjustments And Cash Collateral	[2]	(51,680)	[1]	(16,793)	[3]
Derivative liabilities		3,094		4,586
Uncleared derivatives
Offsetting Assets [Line Items]
Derivative Asset, Total Gross Amount		18,155		20,284
Derivative Asset, Netting Adjustments And Cash Collateral		(17,456)		(20,250)
Derivative Asset, Not Subject to Master Netting Arrangement	[4]	3,291		1,726
Derivative assets		3,990		1,760
Derivative Liability, Total Gross Amount		50,548		13,745
Derivative Liability, Netting Adjustments And Cash Collateral		(49,846)		(11,824)
Derivative Liability, Not Subject to Master Netting Arrangement	[4]	2,392		2,665
Derivative liabilities		3,094		4,586
Cleared derivatives
Offsetting Assets [Line Items]
Derivative Asset, Total Gross Amount		11,302		1,331
Derivative Asset, Netting Adjustments And Cash Collateral		212,747		62,674
Derivative Asset, Not Subject to Master Netting Arrangement	[4]	0		0
Derivative assets		224,049		64,005
Derivative Liability, Total Gross Amount		1,834		4,969
Derivative Liability, Netting Adjustments And Cash Collateral		(1,834)		(4,969)
Derivative Liability, Not Subject to Master Netting Arrangement	[4]	0		0
Derivative liabilities		$ 0		$ 0
[1]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[2]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions, and also cash collateral and related accrued interest held or placed by the FHLB with the same clearing agent and/or counterparty. Cash collateral posted and related accrued interest was (in thousands) $250,609 and $71,246 at June 30, 2019 and December 31, 2018 . Cash collateral received and related accrued interest was (in thousands) $3,638 and $12,029 at June 30, 2019 and December 31, 2018 .
[3]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[4]	Represents mortgage delivery commitments and forward rate agreements that are not subject to an enforceable netting agreement.

Deposits Deposits (Details)

Deposits Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deposits [Abstract]
Interest bearing, demand and overnight	$ 658,340	$ 605,979
Interest bearing, term	43,850	51,600
Interest bearing, other	6,310	4,959
Total interest-bearing	708,500	662,538
Non-interest bearing, other	8,825	6,478
Total non-interest bearing	8,825	6,478
Total deposits	$ 717,325	$ 669,016

Consolidated Obligations (Detai

Consolidated Obligations (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Schedule of Short-term and Long-term Debt [Line Items]
Discount Notes		$ 41,492,853	$ 46,943,632
Consolidated Obligations Bonds Total		48,780,417	45,659,138
Consolidated Obligation Bonds [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Debt, Maturities, Repayments of Principal in Twelve Months		25,729,565	21,085,800
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two		7,945,000	6,998,565
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three		5,142,345	6,829,595
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four		2,572,080	2,958,620
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five		2,694,580	3,248,975
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five		4,630,000	4,525,635
Debt, Gross		48,713,570	45,647,190
Debt Instrument, Unamortized Premium		67,772	75,809
Debt Instrument, Unamortized Discount		(26,856)	(29,275)
Debt Valuation Adjustment for Hedging Activities		1,803	(196)
Fair value option valuation adjustment and accrued interest		24,128	(34,390)
Consolidated Obligations Bonds Total		$ 48,780,417	$ 45,659,138
Debt, Maturities, Repayments of Principal in Next Twelve Months, Weighted Average Interest Rate		2.36%	2.20%
Long-term Debt, Maturities, Repayments of Principal in Year Two, Weighted Average Interest Rate		2.06%	2.13%
Long-term Debt, Maturities, Repayments of Principal in Year Three, Weighted Average Interest Rate		2.33%	2.05%
Long-term Debt, Maturities, Repayments of Principal in Year Four, Weighted Average Interest Rate		2.48%	2.39%
Long-term Debt, Maturities, Repayments of Principal in Year Five, Weighted Average Interest Rate		2.73%	2.63%
Long-term Debt, Maturities, Repayments of Principal After Year Five, Weighted Average Interest Rate		2.96%	2.94%
Long-term Debt, Weighted Average Interest Rate, at Point in Time		2.39%	2.29%
Consolidated Obligation Bonds [Member] | Fixed-rate [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Debt, Gross		$ 32,601,570	$ 29,837,190
Consolidated Obligation Bonds [Member] | Variable-rate [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Debt, Gross		16,102,000	15,470,000
Consolidated Obligation Bonds [Member] | Step-up [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Debt, Gross		10,000	340,000
Consolidated Obligation Bonds [Member] | Earlier of Contractual Maturity or Next Call Date [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Debt, Maturities, Repayments of Principal in Twelve Months		31,354,565	27,173,800
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two		6,865,000	5,773,565
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three		3,661,345	5,060,595
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four		2,096,080	2,470,620
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five		1,857,580	2,231,975
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five		2,879,000	2,936,635
Consolidated Obligation Bonds [Member] | Non Callable [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Debt, Gross		41,936,570	38,539,190
Consolidated Obligation Bonds [Member] | Callable [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Debt, Gross		6,777,000	7,108,000
Discount Notes [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Debt Instrument, Face Amount		$ 41,556,477	$ 47,071,113
Short-term Debt, Weighted Average Interest Rate, at Point in Time	[1]	2.29%	2.35%
[1]	Represents an implied rate without consideration of concessions.

Affordable Housing Program (A_3

Affordable Housing Program (AHP) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Affordable Housing Program [Roll Forward]
AHP Obligation, Beginning Balance			$ 117,336
AHP, Expense (Current Year Additions)	$ 7,168	$ 9,460	15,347	$ 18,712
AHP, Subsidy Uses, Net			(14,277)	$ (11,365)
AHP Obligation, Ending Balance	$ 118,406		$ 118,406

Capital Narrative (Details)

Capital Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Capital [Abstract]
Retained Earnings, Appropriated	$ 418,325	$ 390,829

Capital (Details)

Capital (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Capital [Abstract]
Risk Based Capital Required	$ 746,300	$ 837,666
Risk Based Capital Actual	$ 4,866,050	$ 5,366,443
Regulatory Capital Ratio, Actual	5.05%	5.41%
Regulatory Capital, Required	$ 3,856,979	$ 3,968,103
Regulatory Capital, Actual	$ 4,866,050	$ 5,366,443
Leverage Ratio, Actual	7.57%	8.11%
Leverage Capital, Required	$ 4,821,224	$ 4,960,129
Leverage Capital, Actual	$ 7,299,075	$ 8,049,665

Capital (Mandatorily Redeemable

Capital (Mandatorily Redeemable Capital Stock) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Mandatorily Redeemable Capital Stock [Roll Forward]
Balance at beginning period	$ 23,184
Shares Reclassified to Mandatorily Redeemable Capital Stock, Value	1,178
Repayments of Mandatory Redeemable Capital Securities	(1,801)	$ (4,647)
Balance at end of period	$ 22,561

Capital (Mandatorily Redeemab_2

Capital (Mandatorily Redeemable Capital Stock by Contractual Year of Redemption) (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Capital [Abstract]
Due in 1 year or less		$ 351	$ 1,633
Due after 1 year through 2 years		20	371
Due after 2 years through 3 years		1,438	357
Due after 3 years through 4 years		1,571	1,209
Due after 4 years through 5 years		2,769	3,553
Financial Instruments Subject to Mandatory Redemption, Redeemable After Year Five	[1]	650	624
Past contractual redemption date due to remaining activity	[2]	15,762	15,437
Total par value		$ 22,561	$ 23,184
[1]	Represents mandatorily redeemable capital stock resulting from a Finance Agency rule effective February 19, 2016, that made captive insurance companies ineligible for FHLB membership. Captive insurance companies that were admitted as FHLB members prior to September 12, 2014, will have their membership terminated no later than February 19, 2021. Captive insurance companies that were admitted as FHLB members on or after September 12, 2014, had their membership terminated no later than February 19, 2017. The related mandatorily redeemable capital stock is not required to be redeemed until five years after the member's termination.
[2]	Represents mandatorily redeemable capital stock that is past the end of the contractual redemption period because there is activity outstanding to which the mandatorily redeemable capital stock relates.

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 5,077,110	$ 5,468,947	$ 5,330,216	$ 5,164,513
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	(437)	201	(250)	344
Total other comprehensive income (loss) adjustments	79	688	667	1,317
Ending balance	4,831,113	5,507,475	4,831,113	5,507,475
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	77	19	(110)	(124)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	(437)	201	(250)	344
Amortization - Pension and postretirement benefits	0	0	0	0
Total other comprehensive income (loss) adjustments	(437)	201	(250)	344
Ending balance	(360)	220	(360)	220
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(12,532)	(16,050)	(12,933)	(16,536)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	0	0	0	0
Amortization - Pension and postretirement benefits	516	487	917	973
Total other comprehensive income (loss) adjustments	516	487	917	973
Ending balance	(12,016)	(15,563)	(12,016)	(15,563)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(12,455)	(16,031)	(13,043)	(16,660)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	(437)	201	(250)	344
Amortization - Pension and postretirement benefits	516	487	917	973
Total other comprehensive income (loss) adjustments	79	688	667	1,317
Ending balance	$ (12,376)	$ (15,343)	$ (12,376)	$ (15,343)

Pension and Postretirement Be_3

Pension and Postretirement Benefit Plans Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost	$ 309,000	$ 290,000	$ 806,000	$ 767,000
Pentegra Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1,969,000	$ 2,525,000	$ 3,937,000	$ 5,051,000

Pension and Postretirement Be_4

Pension and Postretirement Benefit Plans Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible List]			us-gaap:OtherNoninterestExpense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible List]			us-gaap:OtherNoninterestExpense
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 234	$ 277	$ 451	$ 553
Defined Benefit Plan, Interest Cost	392	331	775	663
Defined Benefit Plan, Amortization of Gain (Loss)	516	487	917	973
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1,142	1,095	2,143	2,189
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	3	4	7	9
Defined Benefit Plan, Interest Cost	45	42	90	83
Defined Benefit Plan, Amortization of Gain (Loss)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 48	$ 46	$ 97	$ 92

Segment Information Financial P

Segment Information Financial Performance (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)Segment	Jun. 30, 2018USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | Segment			2
Net interest income	$ 97,428	$ 129,191	$ 219,686	$ 247,251
Non-interest income (loss)	(2,659)	(12,809)	(21,058)	(16,666)
Non-interest expense	23,378	22,141	45,801	44,265
Income before assessments	71,391	94,241	152,827	186,320
Affordable Housing Program assessments	7,168	9,460	15,347	18,712
Net income	64,223	84,781	137,480	167,608
Traditional Member Finance [Member]
Segment Reporting Information [Line Items]
Net interest income	70,713	103,643	161,108	196,727
Non-interest income (loss)	(2,109)	(10,737)	(14,064)	(16,927)
Non-interest expense	20,602	19,381	39,992	38,245
Income before assessments	48,002	73,525	107,052	141,555
Affordable Housing Program assessments	4,829	7,388	10,769	14,235
Net income	43,173	66,137	96,283	127,320
Mortgage Purchase Program [Member]
Segment Reporting Information [Line Items]
Net interest income	26,715	25,548	58,578	50,524
Non-interest income (loss)	(550)	(2,072)	(6,994)	261
Non-interest expense	2,776	2,760	5,809	6,020
Income before assessments	23,389	20,716	45,775	44,765
Affordable Housing Program assessments	2,339	2,072	4,578	4,477
Net income	$ 21,050	$ 18,644	$ 41,197	$ 40,288

Segment Information Asset Balan

Segment Information Asset Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 96,424,470	$ 99,202,573
Traditional Member Finance [Member]
Segment Reporting Information [Line Items]
Total assets	83,339,006	86,042,150
Mortgage Purchase Program [Member]
Segment Reporting Information [Line Items]
Total assets	$ 13,085,464	$ 13,160,423

Fair Value Disclosures Fair V_2

Fair Value Disclosures Fair Value Summary (Details) - USD ($) $ in Thousands		Jun. 30, 2019		Dec. 31, 2018
Assets
Cash and Due from Banks		$ 21,771		$ 10,037
Trading securities		8,761,698		223,980
Available-for-sale securities		978,944		2,402,897
Debt Securities, Held-to-maturity	[1]	15,347,168		15,791,222
Debt Securities, Held-to-maturity, Fair Value		15,329,536		15,575,368
Accrued interest receivable		201,154		169,982
Derivative assets		228,039		65,765
Derivative Asset, Netting Adjustments And Cash Collateral	[3]	195,291	[2]	42,424	[4]
Advances, Fair Value Disclosure	[5]	10,214		10,008
Liabilities
Mandatorily redeemable capital stock		22,561		23,184
Accrued Interest Payable, Fair Value Disclosure		159,960		147,337
Derivative liabilities		3,094		4,586
Derivative Liability, Netting Adjustments And Cash Collateral	[3]	(51,680)	[2]	(16,793)	[4]
Consolidated Obligation Bonds [Member]
Liabilities
Consolidated Obligations, Bonds		8,071,128		3,906,610
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and Due from Banks		21,771		10,037
Interest-bearing deposits		0		0
Securities purchased under resale agreements		0		0
Federal funds sold		0		0
Trading securities		0		0
Available-for-sale securities		0		0
Debt Securities, Held-to-maturity, Fair Value		0		0
Advances		0	[6]	0	[7]
Mortgage loans held for portfolio, net		0		0
Accrued interest receivable		0		0
Derivative assets		0		0
Liabilities
Deposits		0		0
Mandatorily redeemable capital stock		22,561		23,184
Accrued Interest Payable, Fair Value Disclosure		0		0
Derivative liabilities		0		0
Fair Value, Inputs, Level 1 [Member] | Financial Standby Letter of Credit [Member]
Other [Abstract]
Commitments, Fair Value Disclosure		0		0
Fair Value, Inputs, Level 1 [Member] | Consolidated Obligation Bonds [Member]
Liabilities
Consolidated Obligations, Bonds		0	[8]	0	[9]
Fair Value, Inputs, Level 1 [Member] | Discount Notes [Member]
Liabilities
Consolidated Obligations, Discount Notes		0		0
Fair Value, Inputs, Level 2 [Member]
Assets
Cash and Due from Banks		0		0
Interest-bearing deposits		375,120		122
Securities purchased under resale agreements		3,301,241		4,402,237
Federal funds sold		13,680,000		10,793,000
Trading securities		8,761,698		223,980
Available-for-sale securities		978,944		2,402,897
Debt Securities, Held-to-maturity, Fair Value		15,329,536		15,575,368
Advances		42,929,502	[6]	54,736,645	[7]
Mortgage loans held for portfolio, net		10,762,691		10,317,010
Accrued interest receivable		201,154		169,982
Derivative assets		32,748		23,341
Liabilities
Deposits		717,425		668,947
Mandatorily redeemable capital stock		0		0
Accrued Interest Payable, Fair Value Disclosure		159,960		147,337
Derivative liabilities		54,774		21,379
Fair Value, Inputs, Level 2 [Member] | Financial Standby Letter of Credit [Member]
Other [Abstract]
Commitments, Fair Value Disclosure		601		443
Fair Value, Inputs, Level 2 [Member] | Consolidated Obligation Bonds [Member]
Liabilities
Consolidated Obligations, Bonds		49,077,406	[8]	45,385,615	[9]
Fair Value, Inputs, Level 2 [Member] | Discount Notes [Member]
Liabilities
Consolidated Obligations, Discount Notes		41,498,903		46,944,523
Fair Value, Inputs, Level 3 [Member]
Assets
Cash and Due from Banks		0		0
Interest-bearing deposits		0		0
Securities purchased under resale agreements		0		0
Federal funds sold		0		0
Trading securities		0		0
Available-for-sale securities		0		0
Debt Securities, Held-to-maturity, Fair Value		0		0
Advances		0	[6]	0	[7]
Mortgage loans held for portfolio, net		10,341		12,972
Accrued interest receivable		0		0
Derivative assets		0		0
Liabilities
Deposits		0		0
Mandatorily redeemable capital stock		0		0
Accrued Interest Payable, Fair Value Disclosure		0		0
Derivative liabilities		0		0
Fair Value, Inputs, Level 3 [Member] | Financial Standby Letter of Credit [Member]
Other [Abstract]
Commitments, Fair Value Disclosure		0		0
Fair Value, Inputs, Level 3 [Member] | Consolidated Obligation Bonds [Member]
Liabilities
Consolidated Obligations, Bonds		0	[8]	0	[9]
Fair Value, Inputs, Level 3 [Member] | Discount Notes [Member]
Liabilities
Consolidated Obligations, Discount Notes		0		0
Carrying Value
Assets
Cash and Due from Banks		21,771		10,037
Interest-bearing deposits		375,120		122
Securities purchased under resale agreements		3,301,185		4,402,208
Federal funds sold		13,680,000		10,793,000
Trading securities		8,761,698		223,980
Available-for-sale securities		978,944		2,402,897
Debt Securities, Held-to-maturity		15,347,168		15,791,222
Advances		42,869,181	[6]	54,822,252	[7]
Mortgage loans held for portfolio, net		10,638,689		10,500,917
Accrued interest receivable		201,154		169,982
Derivative assets		228,039		65,765
Liabilities
Deposits		717,325		669,016
Mandatorily redeemable capital stock		22,561		23,184
Accrued Interest Payable, Fair Value Disclosure		159,960		147,337
Derivative liabilities		3,094		4,586
Carrying Value | Financial Standby Letter of Credit [Member]
Other [Abstract]
Commitments, Fair Value Disclosure		0		0
Carrying Value | Consolidated Obligation Bonds [Member]
Liabilities
Consolidated Obligations, Bonds		48,780,417	[8]	45,659,138	[9]
Carrying Value | Discount Notes [Member]
Liabilities
Consolidated Obligations, Discount Notes		41,492,853		46,943,632
Fair Value
Assets
Cash and Due from Banks		21,771		10,037
Interest-bearing deposits		375,120		122
Securities purchased under resale agreements		3,301,241		4,402,237
Federal funds sold		13,680,000		10,793,000
Trading securities		8,761,698		223,980
Available-for-sale securities		978,944		2,402,897
Debt Securities, Held-to-maturity, Fair Value		15,329,536		15,575,368
Advances		42,929,502	[6]	54,736,645	[7]
Mortgage loans held for portfolio, net		10,773,032		10,329,982
Accrued interest receivable		201,154		169,982
Derivative assets		228,039		65,765
Liabilities
Deposits		717,425		668,947
Mandatorily redeemable capital stock		22,561		23,184
Accrued Interest Payable, Fair Value Disclosure		159,960		147,337
Derivative liabilities		3,094		4,586
Fair Value | Financial Standby Letter of Credit [Member]
Other [Abstract]
Commitments, Fair Value Disclosure		601		443
Fair Value | Consolidated Obligation Bonds [Member]
Liabilities
Consolidated Obligations, Bonds		49,077,406	[8]	45,385,615	[9]
Fair Value | Discount Notes [Member]
Liabilities
Consolidated Obligations, Discount Notes		$ 41,498,903		$ 46,944,523
[1]	Fair values: $15,329,536 and $15,575,368 at June 30, 2019 and December 31, 2018 , respectively.
[2]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[3]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions, and also cash collateral and related accrued interest held or placed by the FHLB with the same clearing agent and/or counterparty. Cash collateral posted and related accrued interest was (in thousands) $250,609 and $71,246 at June 30, 2019 and December 31, 2018 . Cash collateral received and related accrued interest was (in thousands) $3,638 and $12,029 at June 30, 2019 and December 31, 2018 .
[4]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[5]	At June 30, 2019 and December 31, 2018 , none of the Advances were 90 days or more past due or had been placed on non-accrual status.
[6]	Includes (in thousands) $10,214 of Advances recorded under the fair value option at June 30, 2019 .
[7]	Includes (in thousands) $10,008 of Advances recorded under the fair value option at December 31, 2018 .
[8]	Includes (in thousands) $8,071,128 of Consolidated Obligation Bonds recorded under the fair value option at June 30, 2019 .
[9]	Includes (in thousands) $3,906,610 of Consolidated Obligation Bonds recorded under the fair value option at December 31, 2018 .

Fair Value Disclosures Fair V_3

Fair Value Disclosures Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 2019		Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		$ 8,761,698		$ 223,980
Available-for-sale securities		978,944		2,402,897
Advances, Fair Value Disclosure	[1]	10,214		10,008
Derivative assets		228,039		65,765
Derivative Asset, Netting Adjustments And Cash Collateral	[3]	195,291	[2]	42,424	[4]
Derivative liabilities		3,094		4,586
Derivative Liability, Netting Adjustments And Cash Collateral	[3]	(51,680)	[2]	(16,793)	[4]
Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		8,071,128		3,906,610
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		7,055,007		0
US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,706,153		223,368
Available-for-sale securities		128,909		52,895
Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		538		612
Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		850,035		2,350,002
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Advances, Fair Value Disclosure		10,214		10,008
Derivative Asset, Netting Adjustments And Cash Collateral		195,291	[5]	42,424	[6]
Derivative Liability, Netting Adjustments And Cash Collateral		(51,680)	[5]	(16,793)	[6]
Fair Value, Measurements, Recurring [Member] | Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		8,071,128		3,906,610
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Netting Adjustments And Cash Collateral		195,291	[5]	42,424	[6]
Derivative Liability, Netting Adjustments And Cash Collateral		(51,680)	[5]	(16,793)	[6]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Derivative assets		0		0
Derivative liabilities		0		0
Mortgage loans held for portfolio, net		0		0
Fair Value, Inputs, Level 1 [Member] | Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		0	[7]	0	[8]
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Advances, Fair Value Disclosure		0		0
Derivative assets		0		0
Total assests at fair value		0		0
Derivative liabilities		0		0
Total liabilities at fair value		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] | Mortgage Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0
Derivative liabilities		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for portfolio, net	[9]			0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		8,761,698		223,980
Available-for-sale securities		978,944		2,402,897
Derivative assets		32,748		23,341
Derivative liabilities		54,774		21,379
Mortgage loans held for portfolio, net		10,762,691		10,317,010
Fair Value, Inputs, Level 2 [Member] | Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		49,077,406	[7]	45,385,615	[8]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		8,761,698		223,980
Available-for-sale securities		978,944		2,402,897
Advances, Fair Value Disclosure		10,214		10,008
Derivative assets		32,748		23,341
Total assests at fair value		9,783,604		2,660,226
Derivative liabilities		54,774		21,379
Total liabilities at fair value		8,125,902		3,927,989
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		8,071,128		3,906,610
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		29,457		21,615
Derivative liabilities		52,382		18,714
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] | Mortgage Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		3,060		1,726
Derivative liabilities		156		1
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		231
Derivative liabilities		2,236		2,664
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		7,055,007
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,706,153		223,368
Available-for-sale securities		128,909		52,895
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		538		612
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		850,035		2,350,002
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for portfolio, net	[9]			0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Derivative assets		0		0
Derivative liabilities		0		0
Mortgage loans held for portfolio, net		10,341		12,972
Fair Value, Inputs, Level 3 [Member] | Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		0	[7]	0	[8]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Advances, Fair Value Disclosure		0		0
Derivative assets		0		0
Total assests at fair value		0		0
Derivative liabilities		0		0
Total liabilities at fair value		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] | Mortgage Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0
Derivative liabilities		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for portfolio, net	[9]			311
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		8,761,698		223,980
Available-for-sale securities		978,944		2,402,897
Derivative assets		228,039		65,765
Derivative liabilities		3,094		4,586
Mortgage loans held for portfolio, net		10,773,032		10,329,982
Fair Value | Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Obligations, Bonds		49,077,406	[7]	45,385,615	[8]
Fair Value | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		8,761,698		223,980
Available-for-sale securities		978,944		2,402,897
Derivative assets		228,039		65,765
Total assests at fair value		9,978,895		2,702,650
Derivative liabilities		3,094		4,586
Total liabilities at fair value		8,074,222		3,911,196
Fair Value | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		224,748		64,039
Derivative liabilities		702		1,921
Fair Value | Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] | Mortgage Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		3,060		1,726
Derivative liabilities		156		1
Fair Value | Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		231
Derivative liabilities		2,236		2,664
Fair Value | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		7,055,007
Fair Value | Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,706,153		223,368
Available-for-sale securities		128,909		52,895
Fair Value | Fair Value, Measurements, Recurring [Member] | Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		538		612
Fair Value | Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		$ 850,035		2,350,002
Fair Value | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for portfolio, net	[9]			$ 311
[1]	At June 30, 2019 and December 31, 2018 , none of the Advances were 90 days or more past due or had been placed on non-accrual status.
[2]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[3]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions, and also cash collateral and related accrued interest held or placed by the FHLB with the same clearing agent and/or counterparty. Cash collateral posted and related accrued interest was (in thousands) $250,609 and $71,246 at June 30, 2019 and December 31, 2018 . Cash collateral received and related accrued interest was (in thousands) $3,638 and $12,029 at June 30, 2019 and December 31, 2018 .
[4]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[5]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[6]	Amounts represent the application of the netting requirements that allow the FHLB to settle positive and negative positions and also cash collateral and related accrued interest held or placed by the FHLB with the same counterparty.
[7]	Includes (in thousands) $8,071,128 of Consolidated Obligation Bonds recorded under the fair value option at June 30, 2019 .
[8]	Includes (in thousands) $3,906,610 of Consolidated Obligation Bonds recorded under the fair value option at December 31, 2018 .
[9]	The fair value information presented is as of the date the fair value adjustment was recorded during the year ended December 31, 2018 .

Fair Value Disclosures Fair V_4

Fair Value Disclosures Fair Value Impact on Financial Performance (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (24,753,000)	$ (3,894,000)	$ (41,934,000)	$ 15,831,000
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax			0
Advances [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	106,000	(2,000)	206,000	(30,000)
Consolidated Obligation Bonds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (24,859,000)	$ (3,892,000)	$ (42,140,000)	$ 15,861,000

Fair Value Disclosures Fair V_5

Fair Value Disclosures Fair Value Difference Between Fair Value and Remaining Contractual Principal Balance Outstanding (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Federal Home Loan Bank, Advances, Par Value	[1]	$ 10,000	$ 10,000
Advances, Fair Value Disclosure	[1]	10,214	10,008
Federal Home Loan Bank, Advances, Valuation Adjustments under Fair Value Option	[1]	214	8
Consolidated Obligation Bonds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate Unpaid Principal Balance		8,047,000	3,941,000
Aggregate Fair Value		8,071,128	3,906,610
Fair value option valuation adjustment and accrued interest		$ 24,128	$ (34,390)
[1]	At June 30, 2019 and December 31, 2018 , none of the Advances were 90 days or more past due or had been placed on non-accrual status.

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year		$ 15,344,284	$ 14,578,925
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year		352,948	268,395
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability		15,697,232	14,847,320
Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year		20,605	23,215
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year		56,005	54,820
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability		76,610	78,035
Forward Contracts [Member] | Mortgage Receivable [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year		425,663	146,009
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year		0	0
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability		425,663	146,009
Consolidated Obligation Bonds [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	[1]	65,000	92,000
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	[1]	0	0
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	[1]	65,000	92,000
Discount Notes [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	[1]	86,265	525,000
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	[1]	0	0
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	[1]	$ 86,265	$ 525,000
[1]	Expiration is based on settlement period rather than underlying contractual maturity of Consolidated Obligations.

Transactions with Other FHLBa_3

Transactions with Other FHLBanks (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Schedule of Other Transactions [Line Items]
Proceeds from Bonds Transferred from Other Federal Home Loan Banks	$ 0	$ 0
Payments for Bonds Transferred to Other Federal Home Loan Banks	0	0
Other FHLBanks [Member]
Schedule of Other Transactions [Line Items]
Loans Receivable, Average Outstanding Amount	5,801	2,762
Short-term Debt, Average Outstanding Amount	$ 0	$ 552

Transactions with Stockholder_2

Transactions with Stockholders (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Schedule of Other Transactions [Line Items]
Advances		$ 42,754,536	$ 54,872,172
Loans And Leases Receivable, Unpaid Principal Balance		10,403,297	10,272,154
Director [Member]
Schedule of Other Transactions [Line Items]
Advances		$ 3,271,000	$ 3,424,000
Federal Home Loan Bank Advances, Percent of Principal	[1]	7.70%	6.20%
Loans And Leases Receivable, Unpaid Principal Balance		$ 602,000	$ 585,000
Federal Home Loan Bank, Mortgage Purchase Program, Unpaid Principal Balance, Percent of Total	[1]	5.80%	5.70%
Regulatory Capital Stock, Value		$ 310,000	$ 419,000
Regulatory Capital Stock, Percent of Total	[1]	8.10%	9.60%
[1]	Percentage of total principal (Advances), unpaid principal balance (MPP), and regulatory capital stock.

Transactions with Stockholder_3

Transactions with Stockholders (Concentrations) (Details) $ in Thousands	Jun. 30, 2019USD ($)Banks	Dec. 31, 2018USD ($)
Concentration Risk [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 42,754,536	$ 54,872,172
Number of State Housing Authorities Standby Bond Purchase Agreements | Banks	1
JPMorgan Chase Bank National Association [Member] | Capital Stock Ownership By Third Party [Member]
Concentration Risk [Line Items]
Regulatory Capital Stock, Value	$ 1,065,000	$ 1,085,000
Concentration Risk, Percentage	28.00%	25.00%
JPMorgan Chase Bank National Association [Member] | Advances to Members and Former Members [Member]
Concentration Risk [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 11,050,000	$ 23,400,000
JPMorgan Chase Bank National Association [Member] | Mortgage Purchase Program [Member]
Concentration Risk [Line Items]
Federal Home Loan Bank, Mortgage Purchase Program, Unpaid Principal Balance	0	0
U.S. Bank, N.A. [Member] | Capital Stock Ownership By Third Party [Member]
Concentration Risk [Line Items]
Regulatory Capital Stock, Value	$ 456,000	$ 796,000
Concentration Risk, Percentage	12.00%	18.00%
U.S. Bank, N.A. [Member] | Advances to Members and Former Members [Member]
Concentration Risk [Line Items]
Federal Home Loan Bank, Advances, Par Value	$ 4,574,000	$ 4,574,000
U.S. Bank, N.A. [Member] | Mortgage Purchase Program [Member]
Concentration Risk [Line Items]
Federal Home Loan Bank, Mortgage Purchase Program, Unpaid Principal Balance	$ 18,000	19,000
The Huntington National Bank [Member] | Capital Stock Ownership By Third Party [Member]
Concentration Risk [Line Items]
Regulatory Capital Stock, Value		$ 248,000
Concentration Risk, Percentage		6.00%
The Huntington National Bank [Member] | Advances to Members and Former Members [Member]
Concentration Risk [Line Items]
Federal Home Loan Bank, Advances, Par Value		$ 6,000
The Huntington National Bank [Member] | Mortgage Purchase Program [Member]
Concentration Risk [Line Items]
Federal Home Loan Bank, Mortgage Purchase Program, Unpaid Principal Balance		$ 486,000
Kentucky Housing Corporation, Ohio Housing Finance Agency, Tennessee Housing Development Agency [Member]
Concentration Risk [Line Items]
Number Of Relationships With Non Member Affiliates | Banks	3