Name:	fhlbcin_ChangeInLenderRiskAccountBalanceRollForward
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Increases in the Lender Risk Account during the period from purchase-price holdbacks.

No definition available.

Name:	fhlbcin_LenderRiskAccountAdditions
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The beginning/ending balance of the period for the Lender Risk Account, which is a purchase-price holdback to cover expected credit losses for a specific pool of loans.

No definition available.

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

Decreases in the Lender Risk Account from credit losses being paid during the period.

No definition available.

Name:	fhlbcin_LenderRiskAccountClaims
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Decreases in the Lender Risk Account from distributions of purchase-price holdbacks after certain requirements were met.

No definition available.