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Securities (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain (loss) realized in earnings	$ (185)	$ 40
OTTI losses recognized in earnings	(34)	0
Total reclassified amount before tax	(219)	40
Tax (expense) benefit	77	(14)
Total reclassifications out of Accumulated Other Comprehensive Income	$ (142)	$ 26

X

- Definition

Tax effect on items included in earnings for the period and reclassified from other comprehensive income (loss) during the period.

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No definition available.

+ Details

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Namespace Prefix:	inbk_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized through net income during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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No definition available.

+ Details

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Namespace Prefix:	inbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

After tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from OCI portion related to unrealized gain/loss on available for sale securities.

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No definition available.

+ Details

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Namespace Prefix:	inbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Before tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from OCI portion related to unrealized gain/loss on available for sale securities.

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No definition available.

+ Details

Name:	inbk_TotalReclassifiedAmountRecognizedThroughNetIncomeAvailableForSaleSecuritiesAdjustmentBeforeTax
Namespace Prefix:	inbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity.

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No definition available.

+ Details

Name:	us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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