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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
	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