Name:	fhlbt_DepositsPercentageOutstandingByRelatedParty
Namespace Prefix:	fhlbt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

The percentage amount of advances outstanding to members that have an officer or director serving on the board of directors to total advances.

No definition available.

Name:	fhlbt_FederalHomeLoanBankAdvancesPercentageOutstandingByRelatedParty
Namespace Prefix:	fhlbt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

The amount of mortgage loans funded by members that have an officer or director serving on the board of directors or by members holding ten percent or more of capital stock.

No definition available.

Name:	fhlbt_LoansAndLeasesReceivableAcquiredOrFundedWithRelatedPartyDuringPeriod
Namespace Prefix:	fhlbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Regulatory Capital Stock, Percent Of Total

No definition available.

Name:	fhlbt_RegulatoryCapitalStockPercentOfTotal
Namespace Prefix:	fhlbt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

Regulatory Capital Stock, Value

No definition available.

Name:	fhlbt_RegulatoryCapitalStockValue
Namespace Prefix:	fhlbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The aggregate of all domestic interest-bearing and noninterest-bearing deposit liabilities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Name:	us-gaap_DepositsDomestic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.

No definition available.

Name:	us-gaap_FederalHomeLoanBankAdvances
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of interest income from Federal Home Loan Bank (FHLBank) advances to member financial institutions.

No definition available.

Name:	us-gaap_InterestIncomeFederalHomeLoanBankAdvances
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fhlbt_TenPercentOwnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fhlbt_MidfirstBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: