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