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Initial Adoption of Fair Value Option (Details) (Loans Held For Sale [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Loans Held For Sale [Member] |
Initial Adoption Of Fair Value Option [Line Items] |
Aggregate Value | $ 24,258
Loss | (4)
Fair Value | $ 24,254

X
- Definition The gains (losses) included in earnings as a result of electing the fair value option. + References No definition available. + Details
Name: | inbk_GainLossOnMortageBankingActivities
Namespace Prefix: | inbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | inbk_InitialAdoptionOfFairValueOptionLineItems
Namespace Prefix: | inbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the cost basis portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
Name: | inbk_LoansHeldforsaleCostBasis
Namespace Prefix: | inbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of mortgage loans held-for-sale. + References No definition available. + Details
Name: | us-gaap_MortgagesHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant