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Note 18 - Regulatory Matters (Details Textual) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2015
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Capital Conservation Buffer Phase In Amount |  |  | 2.50% | 0.00%
Capital Conservation Buffer | 2.50% | 2.50% |  |

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- Definition The percent of the capital conservation buffer. + References No definition available. + Details
Name: | fcap_CapitalConservationBuffer
Namespace Prefix: | fcap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount resulting from the phase-in of a capital conservation buffer. + References No definition available. + Details
Name: | fcap_CapitalConservationBufferPhaseInAmount
Namespace Prefix: | fcap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant