Note 5 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Total Nonperforming Loans	$ 6,194	$ 5,282
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Total Nonperforming Loans	4,205	4,172
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Total Nonperforming Loans	281	52
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	518	27
Commercial Portfolio Segment [Member]
Total Nonperforming Loans	197	238
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Total Nonperforming Loans	508	365
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Total Nonperforming Loans	485	428
Nonperforming Financial Instruments [Member]
Nonaccrual Loans	2,536	2,946
Loans 90+ Days Past Due Still Accruing	291	78
Total Nonperforming Loans	2,827	3,024
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Nonaccrual Loans	2,298	1,634
Loans 90+ Days Past Due Still Accruing	109	55
Total Nonperforming Loans	2,407	1,689
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Nonaccrual Loans
Loans 90+ Days Past Due Still Accruing	95
Total Nonperforming Loans	95
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Nonaccrual Loans
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Nonaccrual Loans	139	924
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans	139	924
Nonperforming Financial Instruments [Member] \| Commercial Portfolio Segment [Member]
Nonaccrual Loans	42	142
Loans 90+ Days Past Due Still Accruing	59
Total Nonperforming Loans	101	142
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Nonaccrual Loans	57	226
Loans 90+ Days Past Due Still Accruing
Total Nonperforming Loans	57	226
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Nonaccrual Loans		20
Loans 90+ Days Past Due Still Accruing	28	23
Total Nonperforming Loans	$ 28	$ 43

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-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_OtherConsumerLoanMember
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: