Note 4 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Total Nonperforming Loans	$ 6,911	$ 6,194
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Total Nonperforming Loans	4,732	4,205
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Total Nonperforming Loans	438	281
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Total Nonperforming Loans
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Total Nonperforming Loans	450	518
Commercial Portfolio Segment [Member]
Total Nonperforming Loans	522	197
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Total Nonperforming Loans	226	508
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Total Nonperforming Loans	543	485
Nonperforming Financial Instruments [Member]
Nonaccrual Loans	3,055	2,536
Loans 90+ Days Past Due Still Accruing	2	291
Total Nonperforming Loans	3,057	2,827
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Nonaccrual Loans	1,769	2,298
Loans 90+ Days Past Due Still Accruing		109
Total Nonperforming Loans	1,769	2,407
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Nonaccrual Loans	152
Loans 90+ Days Past Due Still Accruing		95
Total Nonperforming Loans	152	95
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Nonaccrual Loans	521
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans	521
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Nonaccrual Loans	371	139
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans	371	139
Nonperforming Financial Instruments [Member] \| Commercial Portfolio Segment [Member]
Nonaccrual Loans	207	42
Loans 90+ Days Past Due Still Accruing		59
Total Nonperforming Loans	207	101
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Nonaccrual Loans	35	57
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans	35	57
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Nonaccrual Loans
Loans 90+ Days Past Due Still Accruing	2	28
Total Nonperforming Loans	$ 2	$ 28

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=fcap_RealEstateMortgagePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_ResidentialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_LandLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_CommercialRealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_HomeEquityAndSecondMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_AllOtherConsumerExcludingHomeEquityAndSecondMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: