Name:	fhlbcin_ConcentrationPercentage
Namespace Prefix:	fhlbcin_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Reflects the unpaid principal balance of mortgage loans outstanding to members and former members that held five percent or more of regulatory capital stock.

No definition available.

Name:	fhlbcin_FederalHomeLoanBankMortgagePurchaseProgramUnpaidPrincipalBalance
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Number of Relationships With Non Member Affiliates

No definition available.

Name:	fhlbcin_NumberOfRelationshipsWithNonMemberAffiliates
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Regulatory capital and permanent capital are defined as retained earnings and Class B stock, which includes mandatorily redeemable capital stock, which is classified as a liability for financial reporting purposes. Regulatory capital and permanent capital do not include AOCI.

No definition available.

Name:	fhlbcin_RegulatoryCapitalStockValue
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.

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

Par amount of advances made and reported by Federal Home Loan Bank (FHLBank).

No definition available.

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

Name:	us-gaap_CounterpartyNameAxis=fhlbcin_JpmorganChaseBankNationalAssociationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=fhlbcin_CapitalStockOwnershipByThirdPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=fhlbcin_AdvancesToMembersAndFormerMembersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=fhlbcin_MortgagePurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CounterpartyNameAxis=fhlbcin_USBankNAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CounterpartyNameAxis=fhlbcin_TheHuntingtonNationalBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CounterpartyNameAxis=fhlbcin_FifthThirdBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: