XML 59 R45.htm IDEA: XBRL DOCUMENT
v3.25.4

Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
Retirement Benefits [Abstract] |
Nonvested Restricted Stock Shares Activity | The following table summarizes the stock-based award activity under the 2022 Plan for the year ended December 31, 2025.
| Restricted Stock Units |  | Weighted-Average Grant Date Fair Value Per Share |  | Restricted Stock Awards |  | Weighted-Average Grant Date Fair Value Per Share |  | Deferred Stock Units |  | Weighted-Average Grant Date Fair Value Per Unit
Unvested at January 1, 2025 | 130,748 |  |  | $ | 24.35 |  |  | 12,040 |  |  | $ | 31.46 |  |  | — |  |  | $ | — |
Granted | 54,948 |  |  | 34.72 |  |  | 16,009 |  |  | 24.72 |  |  | — |  |  | — |
Vested | (28,192) |  |  | 24.32 |  |  | (12,404) |  |  | 31.46 |  |  | — |  |  | — |
Unvested at December 31, 2025 | 157,504 |  |  | $ | 27.97 |  |  | 16,009 |  |  | $ | 24.72 |  |  | — |  |  | $ | — |
The following table summarizes the stock-based award activity under the 2013 Plan for the year ended December 31, 2025:
| Restricted Stock Units |  | Weighted-Average Grant Date Fair Value Per Share |  | Restricted Stock Awards |  | Weighted-Average Grant Date Fair Value Per Share |  | Deferred Stock Units |  | Weighted-Average Grant Date Fair Value Per Unit
Unvested at January 1, 2025 | 22,997 |  |  | $ | 46.71 |  |  | — |  |  | $ | — |  |  | — |  |  | $ | — |
Forfeited | (15,126) |  |  | 46.71 |  |  | — |  |  | — |  |  | — |  |  | — |
Vested | (7,871) |  |  | 46.71 |  |  | — |  |  | — |  |  | — |  |  | — |
Unvested at December 31, 2025 | — |  |  | $ | — |  |  | — |  |  | $ | — |  |  | — |  |  | $ | — |
Schedule Of Deferred Stock Option Plan | The following table summarizes the status of deferred stock rights related to the Directors Deferred Stock Plan for the year ended December 31, 2025.
|  | Deferred Rights
Outstanding, beginning of year |  | 28,821 |
Granted |  | 192 |
Outstanding, end of year |  | 29,013 |

X
- Definition Tabular disclosure of the description of the plan, analysis of deferred stock rights and common stock related to directors deferred stock plan. + References No definition available. + Details
Name: | inbk_ScheduleOfDeferredStockOptionPlanTableTextBlock
Namespace Prefix: | inbk_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (c) -Paragraph 2 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration