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Benefit Plans - Deferred Stock Rights (Details)	9 Months Ended
	Sep. 30, 2023 shares
Deferred Stock Rights
Outstanding, beginning of period (in shares)	40,414,000
Granted (in shares)	301,000
Outstanding, end of period (in shares)	40,715,000

X

- Definition

It represents the deferred stock rights granted to directors during the period related to deferred stock plan.

+ References

No definition available.

+ Details

Name:	inbk_DeferredStockRelatedToDirectorsDeferredStockPlanGrantedInPeriod
Namespace Prefix:	inbk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represents the outstanding number of deferred stock rights related to directors deferred stock plan.

+ References

No definition available.

+ Details

Name:	inbk_DeferredStockRelatedToDirectorsDeferredStockPlanOutstandingNumber
Namespace Prefix:	inbk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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