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Benefit Plans (Details 1) | 12 Months Ended
--- | ---
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Deferred Rights, Outstanding, beginning of year | 70,315
Deferred Rights, Granted | 9,361
Deferred Rights, Exercised | 0
Deferred Rights, Outstanding, end of year | 79,676

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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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
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Namespace Prefix: | inbk_
Data Type: | xbrli:sharesItemType
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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

X
- Details
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