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Commitments and Credit Risk (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Other Commitments [Line Items]
Loan commitments	$ 295.9	$ 254.4
Capital committed to Small Business Investment Company fund, not contributed	1.7
Capital Addition Purchase Commitments
Other Commitments [Line Items]
Construction related contract commitment	65.1
Construction related contract commitment, not yet incurred	$ 58.9
Construction related contract commitment, term	2 years

X

- Definition

Other Commitment, Not Incurred

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No definition available.

+ Details

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Namespace Prefix:	inbk_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Other Commitment, Term

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No definition available.

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X

- Definition

Other Commitments, Capital Committed To Small Business Investment Company Fund

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No definition available.

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X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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No definition available.

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Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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No definition available.

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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