Note 3 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Principal loan balance	$ 431,526	$ 412,211
Accrued interest receivable	1,498	1,365
Deferred loan origination fees, net	1,076	1,041
Recorded investment in loans	434,100	414,617
Individually evaluated for impairment	3,242	3,423
Collectively evaluated for impairment	430,528	410,796
Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	330	398
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member]
Principal loan balance	138,299	136,399
Accrued interest receivable	497	474
Deferred loan origination fees, net	94	87
Recorded investment in loans	138,890	136,960
Individually evaluated for impairment	2,413	2,907
Collectively evaluated for impairment	136,195	133,703
Real Estate Mortgage Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	282	350
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Principal loan balance	22,270	18,198
Accrued interest receivable	126	94
Deferred loan origination fees, net	14	17
Recorded investment in loans	22,410	18,309
Individually evaluated for impairment	96
Collectively evaluated for impairment	22,314	18,309
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Principal loan balance	21,438	20,995
Accrued interest receivable	48	49
Deferred loan origination fees, net	(6)	(10)
Recorded investment in loans	21,480	21,034
Individually evaluated for impairment
Collectively evaluated for impairment	21,480	21,034
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Principal loan balance	106,298	100,133
Accrued interest receivable	251	249
Deferred loan origination fees, net	(41)	(42)
Recorded investment in loans	106,508	100,340
Individually evaluated for impairment	347	401
Collectively evaluated for impairment	106,113	99,891
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans	48	48
Commercial Portfolio Segment [Member]
Principal loan balance	33,773	34,114
Accrued interest receivable	113	87
Deferred loan origination fees, net	1	2
Recorded investment in loans	33,887	34,203
Individually evaluated for impairment	343	42
Collectively evaluated for impairment	33,544	34,161
Commercial Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Principal loan balance	52,139	49,802
Accrued interest receivable	228	189
Deferred loan origination fees, net	1,014	987
Recorded investment in loans	53,381	50,978
Individually evaluated for impairment	35	73
Collectively evaluated for impairment	53,346	50,905
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Principal loan balance	57,309	52,570
Accrued interest receivable	235	223
Deferred loan origination fees, net
Recorded investment in loans	57,544	52,793
Individually evaluated for impairment	8
Collectively evaluated for impairment	57,536	52,793
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Recorded investment in loans

Represents loans and leases receivable accrued interest.

No definition available.

Name:	fcap_LoansAndLeasesReceivableAccruedInterest
Namespace Prefix:	fcap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the loans and leases receivable principal balance.

+ References

No definition available.

+ Details

Name:	fcap_LoansAndLeasesReceivablePrincipalBalance
Namespace Prefix:	fcap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

+ Details

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

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

+ Details

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

- Definition

Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

+ Details

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

- Details

Name:	us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
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: