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Note 16 - Commitments and Contingencies - Commitments to Extend Credit (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fixed rate | $ 6,242 | $ 3,250
Adjustable rate | 5,012 | 10,996
Commitments to extend credit | 118,171 | 121,525
Standby Letters of Credit [Member] |  |
Commitments to extend credit | 346 | 473
Unused Lines of Credit On Credit Cards [Member] |  |
Commitments to extend credit | 0 | 6,915
Undisbursed Commercial and Personal Lines of Credit [Member] |  |
Commitments to extend credit | 29,194 | 26,800
Undisbursed Portion of Construction Loans in Process [Member] |  |
Commitments to extend credit | 19,179 | 23,081
Undisbursed Portion of Home Equity Lines of Credit [Member] |  |
Commitments to extend credit | $ 58,198 | $ 50,010

X
- Definition The amount of unfunded commitments to extend credit. + References No definition available. + Details
Name: | fcap_UnfundedCommitmentsToExtendCredit
Namespace Prefix: | fcap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of fixed rate unfunded credit commitments. + References No definition available. + Details
Name: | fcap_UnfundedCreditCommitmentsFixedRate
Namespace Prefix: | fcap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount variable rate unfunded credit commitments. + References No definition available. + Details
Name: | fcap_UnfundedCreditCommitmentsVariableRate
Namespace Prefix: | fcap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcap_StandbyLettersOfCredit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcap_UnusedLinesOfCreditOnCreditCardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcap_UndisbursedCommercialAndPersonalLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcap_UndisbursedPortionOfConstructionLoansInProcessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcap_UndisbursedPortionOfHomeEquityLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |