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Cash and Cash Equivalents (Details Textual) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
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Cash and Cash Equivalents [Line Items] |
Cash Reserve Deposit Required and Made | $ 267
FHLB of Indianapolis [Member] |
Cash and Cash Equivalents [Line Items] |
Interest-bearing Cash and Cash Equivalents | 7,064
Federal Reserve Bank of Chicago [Member] |
Cash and Cash Equivalents [Line Items] |
Interest-bearing Cash and Cash Equivalents | $ 44,046

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- Definition The sum of cash and cash equivalents interest-bearing cash accounts did not exceed the limits for full FDIC insurance coverage. + References No definition available. + Details
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Namespace Prefix: | inbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
Name: | us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant