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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

X

- 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