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Benefit Plans (Details)	3 Months Ended
	Mar. 31, 2013
Deferred Rights, Outstanding, beginning of period	46,876
Deferred Rights, Granted	5,646
Deferred Rights, Exercised	0
Deferred Rights, Outstanding, end of period	52,522

X

- Definition

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

+ References

No definition available.

+ Details

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

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