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Fair Value of Financial Instruments - Quantative Information About Unobservable Inputs (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Unobservable Inputs (Level 3)
Collateral dependent impaired loans Fair Value	$ 46
Collateral dependent impaired loans Valuation Technique	Fair value of collateral
Collateral dependent impaired loans Unobservable Inputs	Discount for type of property and current market conditions
Collateral dependent impaired loans - Discount for type of property and current market conditions	23.00%
Significant Unobservable Inputs (Level 3) | Minimum
IRLC - Loan closing rates	42.00%		40.00%
Significant Unobservable Inputs (Level 3) | Maximum
IRLC - Loan closing rates	98.00%		95.00%
Interest rate lock commitments
IRLCs Fair Value	$ 623	$ 521
Interest rate lock commitments | Significant Unobservable Inputs (Level 3)
Other securities Valuation Technique	Discounted cash flow	Discounted cash flow
Other securities Unobservable Inputs	Loan closing rates	Loan closing rates
IRLCs Fair Value	$ 623	$ 521

X

- Definition

It represents the Collateral Dependent Impaired Loans And Losses On Fair Value Assets And Liabilities.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

It represents the weighted average marketability discount applied to impaired loans to arrive at fair value range.

+ References

No definition available.

+ Details

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X

- Definition

It represents the collateral dependent impaired loans and losses on fair value assets and liabilities unobservable inputs description.

+ References

No definition available.

+ Details

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X

- Definition

It represents the Collateral Dependent Impaired Loans And Losses On Fair Value Assets And Liabilities Valuation Technique.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of derivative financial instrument.

+ References

No definition available.

+ Details

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X

- Definition

It represents the IRLC on percentage range of fair value assets and Liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	inbk_
Data Type:	num:percentItemType
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Period Type:	duration

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- Definition

It represents the other securities fair value assets and Liabilities unobservable inputs description.

+ References

No definition available.

+ Details

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- Definition

It represents the other securities On fair value assets and Liabilities Valuation Technique.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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