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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Impaired Loans | $ 89 | $ 1,481
Fair Value, Inputs, Level 1 [Member] |  |
Impaired Loans | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Impaired Loans | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Impaired Loans | $ 89 | $ 1,481

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- Definition The fair value measurements of impaired loans recognized at fair value on a nonrecurring basis of loan receivables classified as impaired. + References No definition available. + Details
Name: | inbk_ImpairedLoansAndLossesOnFairValueAssetsAndLiabilitiesMeasuredOnNonrecurringBasis
Namespace Prefix: | inbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant