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Benefit Plans - Deferred Stock Rights (Details)	12 Months Ended
	Dec. 31, 2025 shares
Deferred Rights (in shares)
Outstanding, beginning of year	28,821
Granted	192
Outstanding, end of year	29,013

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