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v3.25.4

Benefit Plans - Deferred Stock Rights (Details) | 12 Months Ended
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Dec. 31, 2025 shares
Deferred Rights (in shares) |
Outstanding, beginning of year | 28,821
Granted | 192
Outstanding, end of year | 29,013

X
- Definition It represents the deferred stock rights granted to directors during the period related to deferred stock plan. + References No definition available. + Details
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Namespace Prefix: | inbk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents the outstanding number of deferred stock rights related to directors deferred stock plan. + References No definition available. + Details
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Namespace Prefix: | inbk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration