Voluntary contribution expense designated to statutory AHP program

No definition available.

Name:	fhlbi_VoluntaryContributionExpenseDesignatedToStatutoryAHP
Namespace Prefix:	fhlbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of expense for Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932.

No definition available.

Name:	us-gaap_AffordableHousingProgramAssessments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of obligation related to Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932.

No definition available.

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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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

Amount of cash outflow for payments made by the Federal Home Loan Banks (FHLBanks) to the Affordable Housing Program (AHP).

No definition available.

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